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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 | 159 | struct opcode { |
b1ea50b2 AK |
160 | u64 flags : 56; |
161 | u64 intercept : 8; | |
120df890 | 162 | union { |
ef65c889 | 163 | int (*execute)(struct x86_emulate_ctxt *ctxt); |
fd0a0d82 MK |
164 | const struct opcode *group; |
165 | const struct group_dual *gdual; | |
166 | const struct gprefix *gprefix; | |
120df890 | 167 | } u; |
d09beabd | 168 | int (*check_perm)(struct x86_emulate_ctxt *ctxt); |
120df890 AK |
169 | }; |
170 | ||
171 | struct group_dual { | |
172 | struct opcode mod012[8]; | |
173 | struct opcode mod3[8]; | |
d65b1dee AK |
174 | }; |
175 | ||
0d7cdee8 AK |
176 | struct 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 |
205 | static 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 | ||
214 | static 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 | ||
221 | static ulong *reg_rmw(struct x86_emulate_ctxt *ctxt, unsigned nr) | |
222 | { | |
223 | reg_read(ctxt, nr); | |
224 | return reg_write(ctxt, nr); | |
225 | } | |
226 | ||
227 | static 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 | ||
235 | static 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) \ | |
cb7cb286 | 429 | : "i" (EFLAGS_MASK), "m" ((ctxt)->src.val)); \ |
f6b3597b AK |
430 | } while (0) |
431 | ||
3f9f53b0 | 432 | /* instruction has only one source operand, destination is implicit (e.g. mul, div, imul, idiv) */ |
e8f2b1d6 | 433 | #define emulate_1op_rax_rdx(ctxt, _op, _ex) \ |
7295261c | 434 | do { \ |
e8f2b1d6 | 435 | switch((ctxt)->src.bytes) { \ |
7295261c | 436 | case 1: \ |
e8f2b1d6 | 437 | __emulate_1op_rax_rdx(ctxt, _op, "b", _ex); \ |
7295261c AK |
438 | break; \ |
439 | case 2: \ | |
e8f2b1d6 | 440 | __emulate_1op_rax_rdx(ctxt, _op, "w", _ex); \ |
7295261c AK |
441 | break; \ |
442 | case 4: \ | |
e8f2b1d6 | 443 | __emulate_1op_rax_rdx(ctxt, _op, "l", _ex); \ |
f6b3597b AK |
444 | break; \ |
445 | case 8: ON64( \ | |
e8f2b1d6 | 446 | __emulate_1op_rax_rdx(ctxt, _op, "q", _ex)); \ |
f6b3597b AK |
447 | break; \ |
448 | } \ | |
449 | } while (0) | |
450 | ||
8a76d7f2 JR |
451 | static int emulator_check_intercept(struct x86_emulate_ctxt *ctxt, |
452 | enum x86_intercept intercept, | |
453 | enum x86_intercept_stage stage) | |
454 | { | |
455 | struct x86_instruction_info info = { | |
456 | .intercept = intercept, | |
9dac77fa AK |
457 | .rep_prefix = ctxt->rep_prefix, |
458 | .modrm_mod = ctxt->modrm_mod, | |
459 | .modrm_reg = ctxt->modrm_reg, | |
460 | .modrm_rm = ctxt->modrm_rm, | |
461 | .src_val = ctxt->src.val64, | |
462 | .src_bytes = ctxt->src.bytes, | |
463 | .dst_bytes = ctxt->dst.bytes, | |
464 | .ad_bytes = ctxt->ad_bytes, | |
8a76d7f2 JR |
465 | .next_rip = ctxt->eip, |
466 | }; | |
467 | ||
2953538e | 468 | return ctxt->ops->intercept(ctxt, &info, stage); |
8a76d7f2 JR |
469 | } |
470 | ||
f47cfa31 AK |
471 | static void assign_masked(ulong *dest, ulong src, ulong mask) |
472 | { | |
473 | *dest = (*dest & ~mask) | (src & mask); | |
474 | } | |
475 | ||
9dac77fa | 476 | static inline unsigned long ad_mask(struct x86_emulate_ctxt *ctxt) |
ddcb2885 | 477 | { |
9dac77fa | 478 | return (1UL << (ctxt->ad_bytes << 3)) - 1; |
ddcb2885 HH |
479 | } |
480 | ||
f47cfa31 AK |
481 | static ulong stack_mask(struct x86_emulate_ctxt *ctxt) |
482 | { | |
483 | u16 sel; | |
484 | struct desc_struct ss; | |
485 | ||
486 | if (ctxt->mode == X86EMUL_MODE_PROT64) | |
487 | return ~0UL; | |
488 | ctxt->ops->get_segment(ctxt, &sel, &ss, NULL, VCPU_SREG_SS); | |
489 | return ~0U >> ((ss.d ^ 1) * 16); /* d=0: 0xffff; d=1: 0xffffffff */ | |
490 | } | |
491 | ||
612e89f0 AK |
492 | static int stack_size(struct x86_emulate_ctxt *ctxt) |
493 | { | |
494 | return (__fls(stack_mask(ctxt)) + 1) >> 3; | |
495 | } | |
496 | ||
6aa8b732 | 497 | /* Access/update address held in a register, based on addressing mode. */ |
e4706772 | 498 | static inline unsigned long |
9dac77fa | 499 | address_mask(struct x86_emulate_ctxt *ctxt, unsigned long reg) |
e4706772 | 500 | { |
9dac77fa | 501 | if (ctxt->ad_bytes == sizeof(unsigned long)) |
e4706772 HH |
502 | return reg; |
503 | else | |
9dac77fa | 504 | return reg & ad_mask(ctxt); |
e4706772 HH |
505 | } |
506 | ||
507 | static inline unsigned long | |
9dac77fa | 508 | register_address(struct x86_emulate_ctxt *ctxt, unsigned long reg) |
e4706772 | 509 | { |
9dac77fa | 510 | return address_mask(ctxt, reg); |
e4706772 HH |
511 | } |
512 | ||
5ad105e5 AK |
513 | static void masked_increment(ulong *reg, ulong mask, int inc) |
514 | { | |
515 | assign_masked(reg, *reg + inc, mask); | |
516 | } | |
517 | ||
7a957275 | 518 | static inline void |
9dac77fa | 519 | register_address_increment(struct x86_emulate_ctxt *ctxt, unsigned long *reg, int inc) |
7a957275 | 520 | { |
5ad105e5 AK |
521 | ulong mask; |
522 | ||
9dac77fa | 523 | if (ctxt->ad_bytes == sizeof(unsigned long)) |
5ad105e5 | 524 | mask = ~0UL; |
7a957275 | 525 | else |
5ad105e5 AK |
526 | mask = ad_mask(ctxt); |
527 | masked_increment(reg, mask, inc); | |
528 | } | |
529 | ||
530 | static void rsp_increment(struct x86_emulate_ctxt *ctxt, int inc) | |
531 | { | |
dd856efa | 532 | masked_increment(reg_rmw(ctxt, VCPU_REGS_RSP), stack_mask(ctxt), inc); |
7a957275 | 533 | } |
6aa8b732 | 534 | |
9dac77fa | 535 | static inline void jmp_rel(struct x86_emulate_ctxt *ctxt, int rel) |
7a957275 | 536 | { |
9dac77fa | 537 | register_address_increment(ctxt, &ctxt->_eip, rel); |
7a957275 | 538 | } |
098c937b | 539 | |
56697687 AK |
540 | static u32 desc_limit_scaled(struct desc_struct *desc) |
541 | { | |
542 | u32 limit = get_desc_limit(desc); | |
543 | ||
544 | return desc->g ? (limit << 12) | 0xfff : limit; | |
545 | } | |
546 | ||
9dac77fa | 547 | static void set_seg_override(struct x86_emulate_ctxt *ctxt, int seg) |
7a5b56df | 548 | { |
9dac77fa AK |
549 | ctxt->has_seg_override = true; |
550 | ctxt->seg_override = seg; | |
7a5b56df AK |
551 | } |
552 | ||
7b105ca2 | 553 | static unsigned long seg_base(struct x86_emulate_ctxt *ctxt, int seg) |
7a5b56df AK |
554 | { |
555 | if (ctxt->mode == X86EMUL_MODE_PROT64 && seg < VCPU_SREG_FS) | |
556 | return 0; | |
557 | ||
7b105ca2 | 558 | return ctxt->ops->get_cached_segment_base(ctxt, seg); |
7a5b56df AK |
559 | } |
560 | ||
9dac77fa | 561 | static unsigned seg_override(struct x86_emulate_ctxt *ctxt) |
7a5b56df | 562 | { |
9dac77fa | 563 | if (!ctxt->has_seg_override) |
7a5b56df AK |
564 | return 0; |
565 | ||
9dac77fa | 566 | return ctxt->seg_override; |
7a5b56df AK |
567 | } |
568 | ||
35d3d4a1 AK |
569 | static int emulate_exception(struct x86_emulate_ctxt *ctxt, int vec, |
570 | u32 error, bool valid) | |
54b8486f | 571 | { |
da9cb575 AK |
572 | ctxt->exception.vector = vec; |
573 | ctxt->exception.error_code = error; | |
574 | ctxt->exception.error_code_valid = valid; | |
35d3d4a1 | 575 | return X86EMUL_PROPAGATE_FAULT; |
54b8486f GN |
576 | } |
577 | ||
3b88e41a JR |
578 | static int emulate_db(struct x86_emulate_ctxt *ctxt) |
579 | { | |
580 | return emulate_exception(ctxt, DB_VECTOR, 0, false); | |
581 | } | |
582 | ||
35d3d4a1 | 583 | static int emulate_gp(struct x86_emulate_ctxt *ctxt, int err) |
54b8486f | 584 | { |
35d3d4a1 | 585 | return emulate_exception(ctxt, GP_VECTOR, err, true); |
54b8486f GN |
586 | } |
587 | ||
618ff15d AK |
588 | static int emulate_ss(struct x86_emulate_ctxt *ctxt, int err) |
589 | { | |
590 | return emulate_exception(ctxt, SS_VECTOR, err, true); | |
591 | } | |
592 | ||
35d3d4a1 | 593 | static int emulate_ud(struct x86_emulate_ctxt *ctxt) |
54b8486f | 594 | { |
35d3d4a1 | 595 | return emulate_exception(ctxt, UD_VECTOR, 0, false); |
54b8486f GN |
596 | } |
597 | ||
35d3d4a1 | 598 | static int emulate_ts(struct x86_emulate_ctxt *ctxt, int err) |
54b8486f | 599 | { |
35d3d4a1 | 600 | return emulate_exception(ctxt, TS_VECTOR, err, true); |
54b8486f GN |
601 | } |
602 | ||
34d1f490 AK |
603 | static int emulate_de(struct x86_emulate_ctxt *ctxt) |
604 | { | |
35d3d4a1 | 605 | return emulate_exception(ctxt, DE_VECTOR, 0, false); |
34d1f490 AK |
606 | } |
607 | ||
1253791d AK |
608 | static int emulate_nm(struct x86_emulate_ctxt *ctxt) |
609 | { | |
610 | return emulate_exception(ctxt, NM_VECTOR, 0, false); | |
611 | } | |
612 | ||
1aa36616 AK |
613 | static u16 get_segment_selector(struct x86_emulate_ctxt *ctxt, unsigned seg) |
614 | { | |
615 | u16 selector; | |
616 | struct desc_struct desc; | |
617 | ||
618 | ctxt->ops->get_segment(ctxt, &selector, &desc, NULL, seg); | |
619 | return selector; | |
620 | } | |
621 | ||
622 | static void set_segment_selector(struct x86_emulate_ctxt *ctxt, u16 selector, | |
623 | unsigned seg) | |
624 | { | |
625 | u16 dummy; | |
626 | u32 base3; | |
627 | struct desc_struct desc; | |
628 | ||
629 | ctxt->ops->get_segment(ctxt, &dummy, &desc, &base3, seg); | |
630 | ctxt->ops->set_segment(ctxt, selector, &desc, base3, seg); | |
631 | } | |
632 | ||
1c11b376 AK |
633 | /* |
634 | * x86 defines three classes of vector instructions: explicitly | |
635 | * aligned, explicitly unaligned, and the rest, which change behaviour | |
636 | * depending on whether they're AVX encoded or not. | |
637 | * | |
638 | * Also included is CMPXCHG16B which is not a vector instruction, yet it is | |
639 | * subject to the same check. | |
640 | */ | |
641 | static bool insn_aligned(struct x86_emulate_ctxt *ctxt, unsigned size) | |
642 | { | |
643 | if (likely(size < 16)) | |
644 | return false; | |
645 | ||
646 | if (ctxt->d & Aligned) | |
647 | return true; | |
648 | else if (ctxt->d & Unaligned) | |
649 | return false; | |
650 | else if (ctxt->d & Avx) | |
651 | return false; | |
652 | else | |
653 | return true; | |
654 | } | |
655 | ||
3d9b938e | 656 | static int __linearize(struct x86_emulate_ctxt *ctxt, |
52fd8b44 | 657 | struct segmented_address addr, |
3d9b938e | 658 | unsigned size, bool write, bool fetch, |
52fd8b44 AK |
659 | ulong *linear) |
660 | { | |
618ff15d AK |
661 | struct desc_struct desc; |
662 | bool usable; | |
52fd8b44 | 663 | ulong la; |
618ff15d | 664 | u32 lim; |
1aa36616 | 665 | u16 sel; |
618ff15d | 666 | unsigned cpl, rpl; |
52fd8b44 | 667 | |
7b105ca2 | 668 | la = seg_base(ctxt, addr.seg) + addr.ea; |
618ff15d | 669 | switch (ctxt->mode) { |
618ff15d AK |
670 | case X86EMUL_MODE_PROT64: |
671 | if (((signed long)la << 16) >> 16 != la) | |
672 | return emulate_gp(ctxt, 0); | |
673 | break; | |
674 | default: | |
1aa36616 AK |
675 | usable = ctxt->ops->get_segment(ctxt, &sel, &desc, NULL, |
676 | addr.seg); | |
618ff15d AK |
677 | if (!usable) |
678 | goto bad; | |
58b7825b GN |
679 | /* code segment in protected mode or read-only data segment */ |
680 | if ((((ctxt->mode != X86EMUL_MODE_REAL) && (desc.type & 8)) | |
681 | || !(desc.type & 2)) && write) | |
618ff15d AK |
682 | goto bad; |
683 | /* unreadable code segment */ | |
3d9b938e | 684 | if (!fetch && (desc.type & 8) && !(desc.type & 2)) |
618ff15d AK |
685 | goto bad; |
686 | lim = desc_limit_scaled(&desc); | |
687 | if ((desc.type & 8) || !(desc.type & 4)) { | |
688 | /* expand-up segment */ | |
689 | if (addr.ea > lim || (u32)(addr.ea + size - 1) > lim) | |
690 | goto bad; | |
691 | } else { | |
fc058680 | 692 | /* expand-down segment */ |
618ff15d AK |
693 | if (addr.ea <= lim || (u32)(addr.ea + size - 1) <= lim) |
694 | goto bad; | |
695 | lim = desc.d ? 0xffffffff : 0xffff; | |
696 | if (addr.ea > lim || (u32)(addr.ea + size - 1) > lim) | |
697 | goto bad; | |
698 | } | |
717746e3 | 699 | cpl = ctxt->ops->cpl(ctxt); |
a5625189 AK |
700 | if (ctxt->mode == X86EMUL_MODE_REAL) |
701 | rpl = 0; | |
702 | else | |
703 | rpl = sel & 3; | |
618ff15d AK |
704 | cpl = max(cpl, rpl); |
705 | if (!(desc.type & 8)) { | |
706 | /* data segment */ | |
707 | if (cpl > desc.dpl) | |
708 | goto bad; | |
709 | } else if ((desc.type & 8) && !(desc.type & 4)) { | |
710 | /* nonconforming code segment */ | |
711 | if (cpl != desc.dpl) | |
712 | goto bad; | |
713 | } else if ((desc.type & 8) && (desc.type & 4)) { | |
714 | /* conforming code segment */ | |
715 | if (cpl < desc.dpl) | |
716 | goto bad; | |
717 | } | |
718 | break; | |
719 | } | |
9dac77fa | 720 | if (fetch ? ctxt->mode != X86EMUL_MODE_PROT64 : ctxt->ad_bytes != 8) |
52fd8b44 | 721 | la &= (u32)-1; |
1c11b376 AK |
722 | if (insn_aligned(ctxt, size) && ((la & (size - 1)) != 0)) |
723 | return emulate_gp(ctxt, 0); | |
52fd8b44 AK |
724 | *linear = la; |
725 | return X86EMUL_CONTINUE; | |
618ff15d AK |
726 | bad: |
727 | if (addr.seg == VCPU_SREG_SS) | |
0afbe2f8 | 728 | return emulate_ss(ctxt, sel); |
618ff15d | 729 | else |
0afbe2f8 | 730 | return emulate_gp(ctxt, sel); |
52fd8b44 AK |
731 | } |
732 | ||
3d9b938e NE |
733 | static int linearize(struct x86_emulate_ctxt *ctxt, |
734 | struct segmented_address addr, | |
735 | unsigned size, bool write, | |
736 | ulong *linear) | |
737 | { | |
738 | return __linearize(ctxt, addr, size, write, false, linear); | |
739 | } | |
740 | ||
741 | ||
3ca3ac4d AK |
742 | static int segmented_read_std(struct x86_emulate_ctxt *ctxt, |
743 | struct segmented_address addr, | |
744 | void *data, | |
745 | unsigned size) | |
746 | { | |
9fa088f4 AK |
747 | int rc; |
748 | ulong linear; | |
749 | ||
83b8795a | 750 | rc = linearize(ctxt, addr, size, false, &linear); |
9fa088f4 AK |
751 | if (rc != X86EMUL_CONTINUE) |
752 | return rc; | |
0f65dd70 | 753 | return ctxt->ops->read_std(ctxt, linear, data, size, &ctxt->exception); |
3ca3ac4d AK |
754 | } |
755 | ||
807941b1 TY |
756 | /* |
757 | * Fetch the next byte of the instruction being emulated which is pointed to | |
758 | * by ctxt->_eip, then increment ctxt->_eip. | |
759 | * | |
760 | * Also prefetch the remaining bytes of the instruction without crossing page | |
761 | * boundary if they are not in fetch_cache yet. | |
762 | */ | |
763 | static int do_insn_fetch_byte(struct x86_emulate_ctxt *ctxt, u8 *dest) | |
62266869 | 764 | { |
9dac77fa | 765 | struct fetch_cache *fc = &ctxt->fetch; |
62266869 | 766 | int rc; |
2fb53ad8 | 767 | int size, cur_size; |
62266869 | 768 | |
807941b1 | 769 | if (ctxt->_eip == fc->end) { |
3d9b938e | 770 | unsigned long linear; |
807941b1 TY |
771 | struct segmented_address addr = { .seg = VCPU_SREG_CS, |
772 | .ea = ctxt->_eip }; | |
2fb53ad8 | 773 | cur_size = fc->end - fc->start; |
807941b1 TY |
774 | size = min(15UL - cur_size, |
775 | PAGE_SIZE - offset_in_page(ctxt->_eip)); | |
3d9b938e | 776 | rc = __linearize(ctxt, addr, size, false, true, &linear); |
7d88bb48 | 777 | if (unlikely(rc != X86EMUL_CONTINUE)) |
3d9b938e | 778 | return rc; |
ef5d75cc TY |
779 | rc = ctxt->ops->fetch(ctxt, linear, fc->data + cur_size, |
780 | size, &ctxt->exception); | |
7d88bb48 | 781 | if (unlikely(rc != X86EMUL_CONTINUE)) |
62266869 | 782 | return rc; |
2fb53ad8 | 783 | fc->end += size; |
62266869 | 784 | } |
807941b1 TY |
785 | *dest = fc->data[ctxt->_eip - fc->start]; |
786 | ctxt->_eip++; | |
3e2815e9 | 787 | return X86EMUL_CONTINUE; |
62266869 AK |
788 | } |
789 | ||
790 | static int do_insn_fetch(struct x86_emulate_ctxt *ctxt, | |
807941b1 | 791 | void *dest, unsigned size) |
62266869 | 792 | { |
3e2815e9 | 793 | int rc; |
62266869 | 794 | |
eb3c79e6 | 795 | /* x86 instructions are limited to 15 bytes. */ |
7d88bb48 | 796 | if (unlikely(ctxt->_eip + size - ctxt->eip > 15)) |
eb3c79e6 | 797 | return X86EMUL_UNHANDLEABLE; |
62266869 | 798 | while (size--) { |
807941b1 | 799 | rc = do_insn_fetch_byte(ctxt, dest++); |
3e2815e9 | 800 | if (rc != X86EMUL_CONTINUE) |
62266869 AK |
801 | return rc; |
802 | } | |
3e2815e9 | 803 | return X86EMUL_CONTINUE; |
62266869 AK |
804 | } |
805 | ||
67cbc90d | 806 | /* Fetch next part of the instruction being emulated. */ |
e85a1085 | 807 | #define insn_fetch(_type, _ctxt) \ |
67cbc90d | 808 | ({ unsigned long _x; \ |
e85a1085 | 809 | rc = do_insn_fetch(_ctxt, &_x, sizeof(_type)); \ |
67cbc90d TY |
810 | if (rc != X86EMUL_CONTINUE) \ |
811 | goto done; \ | |
67cbc90d TY |
812 | (_type)_x; \ |
813 | }) | |
814 | ||
807941b1 TY |
815 | #define insn_fetch_arr(_arr, _size, _ctxt) \ |
816 | ({ rc = do_insn_fetch(_ctxt, _arr, (_size)); \ | |
67cbc90d TY |
817 | if (rc != X86EMUL_CONTINUE) \ |
818 | goto done; \ | |
67cbc90d TY |
819 | }) |
820 | ||
1e3c5cb0 RR |
821 | /* |
822 | * Given the 'reg' portion of a ModRM byte, and a register block, return a | |
823 | * pointer into the block that addresses the relevant register. | |
824 | * @highbyte_regs specifies whether to decode AH,CH,DH,BH. | |
825 | */ | |
dd856efa | 826 | static void *decode_register(struct x86_emulate_ctxt *ctxt, u8 modrm_reg, |
1e3c5cb0 | 827 | int highbyte_regs) |
6aa8b732 AK |
828 | { |
829 | void *p; | |
830 | ||
6aa8b732 | 831 | if (highbyte_regs && modrm_reg >= 4 && modrm_reg < 8) |
dd856efa AK |
832 | p = (unsigned char *)reg_rmw(ctxt, modrm_reg & 3) + 1; |
833 | else | |
834 | p = reg_rmw(ctxt, modrm_reg); | |
6aa8b732 AK |
835 | return p; |
836 | } | |
837 | ||
838 | static int read_descriptor(struct x86_emulate_ctxt *ctxt, | |
90de84f5 | 839 | struct segmented_address addr, |
6aa8b732 AK |
840 | u16 *size, unsigned long *address, int op_bytes) |
841 | { | |
842 | int rc; | |
843 | ||
844 | if (op_bytes == 2) | |
845 | op_bytes = 3; | |
846 | *address = 0; | |
3ca3ac4d | 847 | rc = segmented_read_std(ctxt, addr, size, 2); |
1b30eaa8 | 848 | if (rc != X86EMUL_CONTINUE) |
6aa8b732 | 849 | return rc; |
30b31ab6 | 850 | addr.ea += 2; |
3ca3ac4d | 851 | rc = segmented_read_std(ctxt, addr, address, op_bytes); |
6aa8b732 AK |
852 | return rc; |
853 | } | |
854 | ||
bbe9abbd NK |
855 | static int test_cc(unsigned int condition, unsigned int flags) |
856 | { | |
857 | int rc = 0; | |
858 | ||
859 | switch ((condition & 15) >> 1) { | |
860 | case 0: /* o */ | |
861 | rc |= (flags & EFLG_OF); | |
862 | break; | |
863 | case 1: /* b/c/nae */ | |
864 | rc |= (flags & EFLG_CF); | |
865 | break; | |
866 | case 2: /* z/e */ | |
867 | rc |= (flags & EFLG_ZF); | |
868 | break; | |
869 | case 3: /* be/na */ | |
870 | rc |= (flags & (EFLG_CF|EFLG_ZF)); | |
871 | break; | |
872 | case 4: /* s */ | |
873 | rc |= (flags & EFLG_SF); | |
874 | break; | |
875 | case 5: /* p/pe */ | |
876 | rc |= (flags & EFLG_PF); | |
877 | break; | |
878 | case 7: /* le/ng */ | |
879 | rc |= (flags & EFLG_ZF); | |
880 | /* fall through */ | |
881 | case 6: /* l/nge */ | |
882 | rc |= (!(flags & EFLG_SF) != !(flags & EFLG_OF)); | |
883 | break; | |
884 | } | |
885 | ||
886 | /* Odd condition identifiers (lsb == 1) have inverted sense. */ | |
887 | return (!!rc ^ (condition & 1)); | |
888 | } | |
889 | ||
91ff3cb4 AK |
890 | static void fetch_register_operand(struct operand *op) |
891 | { | |
892 | switch (op->bytes) { | |
893 | case 1: | |
894 | op->val = *(u8 *)op->addr.reg; | |
895 | break; | |
896 | case 2: | |
897 | op->val = *(u16 *)op->addr.reg; | |
898 | break; | |
899 | case 4: | |
900 | op->val = *(u32 *)op->addr.reg; | |
901 | break; | |
902 | case 8: | |
903 | op->val = *(u64 *)op->addr.reg; | |
904 | break; | |
905 | } | |
906 | } | |
907 | ||
1253791d AK |
908 | static void read_sse_reg(struct x86_emulate_ctxt *ctxt, sse128_t *data, int reg) |
909 | { | |
910 | ctxt->ops->get_fpu(ctxt); | |
911 | switch (reg) { | |
89a87c67 MK |
912 | case 0: asm("movdqa %%xmm0, %0" : "=m"(*data)); break; |
913 | case 1: asm("movdqa %%xmm1, %0" : "=m"(*data)); break; | |
914 | case 2: asm("movdqa %%xmm2, %0" : "=m"(*data)); break; | |
915 | case 3: asm("movdqa %%xmm3, %0" : "=m"(*data)); break; | |
916 | case 4: asm("movdqa %%xmm4, %0" : "=m"(*data)); break; | |
917 | case 5: asm("movdqa %%xmm5, %0" : "=m"(*data)); break; | |
918 | case 6: asm("movdqa %%xmm6, %0" : "=m"(*data)); break; | |
919 | case 7: asm("movdqa %%xmm7, %0" : "=m"(*data)); break; | |
1253791d | 920 | #ifdef CONFIG_X86_64 |
89a87c67 MK |
921 | case 8: asm("movdqa %%xmm8, %0" : "=m"(*data)); break; |
922 | case 9: asm("movdqa %%xmm9, %0" : "=m"(*data)); break; | |
923 | case 10: asm("movdqa %%xmm10, %0" : "=m"(*data)); break; | |
924 | case 11: asm("movdqa %%xmm11, %0" : "=m"(*data)); break; | |
925 | case 12: asm("movdqa %%xmm12, %0" : "=m"(*data)); break; | |
926 | case 13: asm("movdqa %%xmm13, %0" : "=m"(*data)); break; | |
927 | case 14: asm("movdqa %%xmm14, %0" : "=m"(*data)); break; | |
928 | case 15: asm("movdqa %%xmm15, %0" : "=m"(*data)); break; | |
1253791d AK |
929 | #endif |
930 | default: BUG(); | |
931 | } | |
932 | ctxt->ops->put_fpu(ctxt); | |
933 | } | |
934 | ||
935 | static void write_sse_reg(struct x86_emulate_ctxt *ctxt, sse128_t *data, | |
936 | int reg) | |
937 | { | |
938 | ctxt->ops->get_fpu(ctxt); | |
939 | switch (reg) { | |
89a87c67 MK |
940 | case 0: asm("movdqa %0, %%xmm0" : : "m"(*data)); break; |
941 | case 1: asm("movdqa %0, %%xmm1" : : "m"(*data)); break; | |
942 | case 2: asm("movdqa %0, %%xmm2" : : "m"(*data)); break; | |
943 | case 3: asm("movdqa %0, %%xmm3" : : "m"(*data)); break; | |
944 | case 4: asm("movdqa %0, %%xmm4" : : "m"(*data)); break; | |
945 | case 5: asm("movdqa %0, %%xmm5" : : "m"(*data)); break; | |
946 | case 6: asm("movdqa %0, %%xmm6" : : "m"(*data)); break; | |
947 | case 7: asm("movdqa %0, %%xmm7" : : "m"(*data)); break; | |
1253791d | 948 | #ifdef CONFIG_X86_64 |
89a87c67 MK |
949 | case 8: asm("movdqa %0, %%xmm8" : : "m"(*data)); break; |
950 | case 9: asm("movdqa %0, %%xmm9" : : "m"(*data)); break; | |
951 | case 10: asm("movdqa %0, %%xmm10" : : "m"(*data)); break; | |
952 | case 11: asm("movdqa %0, %%xmm11" : : "m"(*data)); break; | |
953 | case 12: asm("movdqa %0, %%xmm12" : : "m"(*data)); break; | |
954 | case 13: asm("movdqa %0, %%xmm13" : : "m"(*data)); break; | |
955 | case 14: asm("movdqa %0, %%xmm14" : : "m"(*data)); break; | |
956 | case 15: asm("movdqa %0, %%xmm15" : : "m"(*data)); break; | |
1253791d AK |
957 | #endif |
958 | default: BUG(); | |
959 | } | |
960 | ctxt->ops->put_fpu(ctxt); | |
961 | } | |
962 | ||
cbe2c9d3 AK |
963 | static void read_mmx_reg(struct x86_emulate_ctxt *ctxt, u64 *data, int reg) |
964 | { | |
965 | ctxt->ops->get_fpu(ctxt); | |
966 | switch (reg) { | |
967 | case 0: asm("movq %%mm0, %0" : "=m"(*data)); break; | |
968 | case 1: asm("movq %%mm1, %0" : "=m"(*data)); break; | |
969 | case 2: asm("movq %%mm2, %0" : "=m"(*data)); break; | |
970 | case 3: asm("movq %%mm3, %0" : "=m"(*data)); break; | |
971 | case 4: asm("movq %%mm4, %0" : "=m"(*data)); break; | |
972 | case 5: asm("movq %%mm5, %0" : "=m"(*data)); break; | |
973 | case 6: asm("movq %%mm6, %0" : "=m"(*data)); break; | |
974 | case 7: asm("movq %%mm7, %0" : "=m"(*data)); break; | |
975 | default: BUG(); | |
976 | } | |
977 | ctxt->ops->put_fpu(ctxt); | |
978 | } | |
979 | ||
980 | static void write_mmx_reg(struct x86_emulate_ctxt *ctxt, u64 *data, int reg) | |
981 | { | |
982 | ctxt->ops->get_fpu(ctxt); | |
983 | switch (reg) { | |
984 | case 0: asm("movq %0, %%mm0" : : "m"(*data)); break; | |
985 | case 1: asm("movq %0, %%mm1" : : "m"(*data)); break; | |
986 | case 2: asm("movq %0, %%mm2" : : "m"(*data)); break; | |
987 | case 3: asm("movq %0, %%mm3" : : "m"(*data)); break; | |
988 | case 4: asm("movq %0, %%mm4" : : "m"(*data)); break; | |
989 | case 5: asm("movq %0, %%mm5" : : "m"(*data)); break; | |
990 | case 6: asm("movq %0, %%mm6" : : "m"(*data)); break; | |
991 | case 7: asm("movq %0, %%mm7" : : "m"(*data)); break; | |
992 | default: BUG(); | |
993 | } | |
994 | ctxt->ops->put_fpu(ctxt); | |
995 | } | |
996 | ||
1253791d | 997 | static void decode_register_operand(struct x86_emulate_ctxt *ctxt, |
2adb5ad9 | 998 | struct operand *op) |
3c118e24 | 999 | { |
9dac77fa AK |
1000 | unsigned reg = ctxt->modrm_reg; |
1001 | int highbyte_regs = ctxt->rex_prefix == 0; | |
33615aa9 | 1002 | |
9dac77fa AK |
1003 | if (!(ctxt->d & ModRM)) |
1004 | reg = (ctxt->b & 7) | ((ctxt->rex_prefix & 1) << 3); | |
1253791d | 1005 | |
9dac77fa | 1006 | if (ctxt->d & Sse) { |
1253791d AK |
1007 | op->type = OP_XMM; |
1008 | op->bytes = 16; | |
1009 | op->addr.xmm = reg; | |
1010 | read_sse_reg(ctxt, &op->vec_val, reg); | |
1011 | return; | |
1012 | } | |
cbe2c9d3 AK |
1013 | if (ctxt->d & Mmx) { |
1014 | reg &= 7; | |
1015 | op->type = OP_MM; | |
1016 | op->bytes = 8; | |
1017 | op->addr.mm = reg; | |
1018 | return; | |
1019 | } | |
1253791d | 1020 | |
3c118e24 | 1021 | op->type = OP_REG; |
2adb5ad9 | 1022 | if (ctxt->d & ByteOp) { |
dd856efa | 1023 | op->addr.reg = decode_register(ctxt, reg, highbyte_regs); |
3c118e24 AK |
1024 | op->bytes = 1; |
1025 | } else { | |
dd856efa | 1026 | op->addr.reg = decode_register(ctxt, reg, 0); |
9dac77fa | 1027 | op->bytes = ctxt->op_bytes; |
3c118e24 | 1028 | } |
91ff3cb4 | 1029 | fetch_register_operand(op); |
3c118e24 AK |
1030 | op->orig_val = op->val; |
1031 | } | |
1032 | ||
a6e3407b AK |
1033 | static void adjust_modrm_seg(struct x86_emulate_ctxt *ctxt, int base_reg) |
1034 | { | |
1035 | if (base_reg == VCPU_REGS_RSP || base_reg == VCPU_REGS_RBP) | |
1036 | ctxt->modrm_seg = VCPU_SREG_SS; | |
1037 | } | |
1038 | ||
1c73ef66 | 1039 | static int decode_modrm(struct x86_emulate_ctxt *ctxt, |
2dbd0dd7 | 1040 | struct operand *op) |
1c73ef66 | 1041 | { |
1c73ef66 | 1042 | u8 sib; |
f5b4edcd | 1043 | int index_reg = 0, base_reg = 0, scale; |
3e2815e9 | 1044 | int rc = X86EMUL_CONTINUE; |
2dbd0dd7 | 1045 | ulong modrm_ea = 0; |
1c73ef66 | 1046 | |
9dac77fa AK |
1047 | if (ctxt->rex_prefix) { |
1048 | ctxt->modrm_reg = (ctxt->rex_prefix & 4) << 1; /* REX.R */ | |
1049 | index_reg = (ctxt->rex_prefix & 2) << 2; /* REX.X */ | |
1050 | ctxt->modrm_rm = base_reg = (ctxt->rex_prefix & 1) << 3; /* REG.B */ | |
1c73ef66 AK |
1051 | } |
1052 | ||
9dac77fa AK |
1053 | ctxt->modrm_mod |= (ctxt->modrm & 0xc0) >> 6; |
1054 | ctxt->modrm_reg |= (ctxt->modrm & 0x38) >> 3; | |
1055 | ctxt->modrm_rm |= (ctxt->modrm & 0x07); | |
1056 | ctxt->modrm_seg = VCPU_SREG_DS; | |
1c73ef66 | 1057 | |
9dac77fa | 1058 | if (ctxt->modrm_mod == 3) { |
2dbd0dd7 | 1059 | op->type = OP_REG; |
9dac77fa | 1060 | op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; |
dd856efa | 1061 | op->addr.reg = decode_register(ctxt, ctxt->modrm_rm, ctxt->d & ByteOp); |
9dac77fa | 1062 | if (ctxt->d & Sse) { |
1253791d AK |
1063 | op->type = OP_XMM; |
1064 | op->bytes = 16; | |
9dac77fa AK |
1065 | op->addr.xmm = ctxt->modrm_rm; |
1066 | read_sse_reg(ctxt, &op->vec_val, ctxt->modrm_rm); | |
1253791d AK |
1067 | return rc; |
1068 | } | |
cbe2c9d3 AK |
1069 | if (ctxt->d & Mmx) { |
1070 | op->type = OP_MM; | |
1071 | op->bytes = 8; | |
1072 | op->addr.xmm = ctxt->modrm_rm & 7; | |
1073 | return rc; | |
1074 | } | |
2dbd0dd7 | 1075 | fetch_register_operand(op); |
1c73ef66 AK |
1076 | return rc; |
1077 | } | |
1078 | ||
2dbd0dd7 AK |
1079 | op->type = OP_MEM; |
1080 | ||
9dac77fa | 1081 | if (ctxt->ad_bytes == 2) { |
dd856efa AK |
1082 | unsigned bx = reg_read(ctxt, VCPU_REGS_RBX); |
1083 | unsigned bp = reg_read(ctxt, VCPU_REGS_RBP); | |
1084 | unsigned si = reg_read(ctxt, VCPU_REGS_RSI); | |
1085 | unsigned di = reg_read(ctxt, VCPU_REGS_RDI); | |
1c73ef66 AK |
1086 | |
1087 | /* 16-bit ModR/M decode. */ | |
9dac77fa | 1088 | switch (ctxt->modrm_mod) { |
1c73ef66 | 1089 | case 0: |
9dac77fa | 1090 | if (ctxt->modrm_rm == 6) |
e85a1085 | 1091 | modrm_ea += insn_fetch(u16, ctxt); |
1c73ef66 AK |
1092 | break; |
1093 | case 1: | |
e85a1085 | 1094 | modrm_ea += insn_fetch(s8, ctxt); |
1c73ef66 AK |
1095 | break; |
1096 | case 2: | |
e85a1085 | 1097 | modrm_ea += insn_fetch(u16, ctxt); |
1c73ef66 AK |
1098 | break; |
1099 | } | |
9dac77fa | 1100 | switch (ctxt->modrm_rm) { |
1c73ef66 | 1101 | case 0: |
2dbd0dd7 | 1102 | modrm_ea += bx + si; |
1c73ef66 AK |
1103 | break; |
1104 | case 1: | |
2dbd0dd7 | 1105 | modrm_ea += bx + di; |
1c73ef66 AK |
1106 | break; |
1107 | case 2: | |
2dbd0dd7 | 1108 | modrm_ea += bp + si; |
1c73ef66 AK |
1109 | break; |
1110 | case 3: | |
2dbd0dd7 | 1111 | modrm_ea += bp + di; |
1c73ef66 AK |
1112 | break; |
1113 | case 4: | |
2dbd0dd7 | 1114 | modrm_ea += si; |
1c73ef66 AK |
1115 | break; |
1116 | case 5: | |
2dbd0dd7 | 1117 | modrm_ea += di; |
1c73ef66 AK |
1118 | break; |
1119 | case 6: | |
9dac77fa | 1120 | if (ctxt->modrm_mod != 0) |
2dbd0dd7 | 1121 | modrm_ea += bp; |
1c73ef66 AK |
1122 | break; |
1123 | case 7: | |
2dbd0dd7 | 1124 | modrm_ea += bx; |
1c73ef66 AK |
1125 | break; |
1126 | } | |
9dac77fa AK |
1127 | if (ctxt->modrm_rm == 2 || ctxt->modrm_rm == 3 || |
1128 | (ctxt->modrm_rm == 6 && ctxt->modrm_mod != 0)) | |
1129 | ctxt->modrm_seg = VCPU_SREG_SS; | |
2dbd0dd7 | 1130 | modrm_ea = (u16)modrm_ea; |
1c73ef66 AK |
1131 | } else { |
1132 | /* 32/64-bit ModR/M decode. */ | |
9dac77fa | 1133 | if ((ctxt->modrm_rm & 7) == 4) { |
e85a1085 | 1134 | sib = insn_fetch(u8, ctxt); |
1c73ef66 AK |
1135 | index_reg |= (sib >> 3) & 7; |
1136 | base_reg |= sib & 7; | |
1137 | scale = sib >> 6; | |
1138 | ||
9dac77fa | 1139 | if ((base_reg & 7) == 5 && ctxt->modrm_mod == 0) |
e85a1085 | 1140 | modrm_ea += insn_fetch(s32, ctxt); |
a6e3407b | 1141 | else { |
dd856efa | 1142 | modrm_ea += reg_read(ctxt, base_reg); |
a6e3407b AK |
1143 | adjust_modrm_seg(ctxt, base_reg); |
1144 | } | |
dc71d0f1 | 1145 | if (index_reg != 4) |
dd856efa | 1146 | modrm_ea += reg_read(ctxt, index_reg) << scale; |
9dac77fa | 1147 | } else if ((ctxt->modrm_rm & 7) == 5 && ctxt->modrm_mod == 0) { |
84411d85 | 1148 | if (ctxt->mode == X86EMUL_MODE_PROT64) |
9dac77fa | 1149 | ctxt->rip_relative = 1; |
a6e3407b AK |
1150 | } else { |
1151 | base_reg = ctxt->modrm_rm; | |
dd856efa | 1152 | modrm_ea += reg_read(ctxt, base_reg); |
a6e3407b AK |
1153 | adjust_modrm_seg(ctxt, base_reg); |
1154 | } | |
9dac77fa | 1155 | switch (ctxt->modrm_mod) { |
1c73ef66 | 1156 | case 0: |
9dac77fa | 1157 | if (ctxt->modrm_rm == 5) |
e85a1085 | 1158 | modrm_ea += insn_fetch(s32, ctxt); |
1c73ef66 AK |
1159 | break; |
1160 | case 1: | |
e85a1085 | 1161 | modrm_ea += insn_fetch(s8, ctxt); |
1c73ef66 AK |
1162 | break; |
1163 | case 2: | |
e85a1085 | 1164 | modrm_ea += insn_fetch(s32, ctxt); |
1c73ef66 AK |
1165 | break; |
1166 | } | |
1167 | } | |
90de84f5 | 1168 | op->addr.mem.ea = modrm_ea; |
1c73ef66 AK |
1169 | done: |
1170 | return rc; | |
1171 | } | |
1172 | ||
1173 | static int decode_abs(struct x86_emulate_ctxt *ctxt, | |
2dbd0dd7 | 1174 | struct operand *op) |
1c73ef66 | 1175 | { |
3e2815e9 | 1176 | int rc = X86EMUL_CONTINUE; |
1c73ef66 | 1177 | |
2dbd0dd7 | 1178 | op->type = OP_MEM; |
9dac77fa | 1179 | switch (ctxt->ad_bytes) { |
1c73ef66 | 1180 | case 2: |
e85a1085 | 1181 | op->addr.mem.ea = insn_fetch(u16, ctxt); |
1c73ef66 AK |
1182 | break; |
1183 | case 4: | |
e85a1085 | 1184 | op->addr.mem.ea = insn_fetch(u32, ctxt); |
1c73ef66 AK |
1185 | break; |
1186 | case 8: | |
e85a1085 | 1187 | op->addr.mem.ea = insn_fetch(u64, ctxt); |
1c73ef66 AK |
1188 | break; |
1189 | } | |
1190 | done: | |
1191 | return rc; | |
1192 | } | |
1193 | ||
9dac77fa | 1194 | static void fetch_bit_operand(struct x86_emulate_ctxt *ctxt) |
35c843c4 | 1195 | { |
7129eeca | 1196 | long sv = 0, mask; |
35c843c4 | 1197 | |
9dac77fa AK |
1198 | if (ctxt->dst.type == OP_MEM && ctxt->src.type == OP_REG) { |
1199 | mask = ~(ctxt->dst.bytes * 8 - 1); | |
35c843c4 | 1200 | |
9dac77fa AK |
1201 | if (ctxt->src.bytes == 2) |
1202 | sv = (s16)ctxt->src.val & (s16)mask; | |
1203 | else if (ctxt->src.bytes == 4) | |
1204 | sv = (s32)ctxt->src.val & (s32)mask; | |
35c843c4 | 1205 | |
9dac77fa | 1206 | ctxt->dst.addr.mem.ea += (sv >> 3); |
35c843c4 | 1207 | } |
ba7ff2b7 WY |
1208 | |
1209 | /* only subword offset */ | |
9dac77fa | 1210 | ctxt->src.val &= (ctxt->dst.bytes << 3) - 1; |
35c843c4 WY |
1211 | } |
1212 | ||
dde7e6d1 | 1213 | static int read_emulated(struct x86_emulate_ctxt *ctxt, |
dde7e6d1 | 1214 | unsigned long addr, void *dest, unsigned size) |
6aa8b732 | 1215 | { |
dde7e6d1 | 1216 | int rc; |
9dac77fa | 1217 | struct read_cache *mc = &ctxt->mem_read; |
6aa8b732 | 1218 | |
f23b070e XG |
1219 | if (mc->pos < mc->end) |
1220 | goto read_cached; | |
6aa8b732 | 1221 | |
f23b070e XG |
1222 | WARN_ON((mc->end + size) >= sizeof(mc->data)); |
1223 | ||
1224 | rc = ctxt->ops->read_emulated(ctxt, addr, mc->data + mc->end, size, | |
1225 | &ctxt->exception); | |
1226 | if (rc != X86EMUL_CONTINUE) | |
1227 | return rc; | |
1228 | ||
1229 | mc->end += size; | |
1230 | ||
1231 | read_cached: | |
1232 | memcpy(dest, mc->data + mc->pos, size); | |
1233 | mc->pos += size; | |
dde7e6d1 AK |
1234 | return X86EMUL_CONTINUE; |
1235 | } | |
6aa8b732 | 1236 | |
3ca3ac4d AK |
1237 | static int segmented_read(struct x86_emulate_ctxt *ctxt, |
1238 | struct segmented_address addr, | |
1239 | void *data, | |
1240 | unsigned size) | |
1241 | { | |
9fa088f4 AK |
1242 | int rc; |
1243 | ulong linear; | |
1244 | ||
83b8795a | 1245 | rc = linearize(ctxt, addr, size, false, &linear); |
9fa088f4 AK |
1246 | if (rc != X86EMUL_CONTINUE) |
1247 | return rc; | |
7b105ca2 | 1248 | return read_emulated(ctxt, linear, data, size); |
3ca3ac4d AK |
1249 | } |
1250 | ||
1251 | static int segmented_write(struct x86_emulate_ctxt *ctxt, | |
1252 | struct segmented_address addr, | |
1253 | const void *data, | |
1254 | unsigned size) | |
1255 | { | |
9fa088f4 AK |
1256 | int rc; |
1257 | ulong linear; | |
1258 | ||
83b8795a | 1259 | rc = linearize(ctxt, addr, size, true, &linear); |
9fa088f4 AK |
1260 | if (rc != X86EMUL_CONTINUE) |
1261 | return rc; | |
0f65dd70 AK |
1262 | return ctxt->ops->write_emulated(ctxt, linear, data, size, |
1263 | &ctxt->exception); | |
3ca3ac4d AK |
1264 | } |
1265 | ||
1266 | static int segmented_cmpxchg(struct x86_emulate_ctxt *ctxt, | |
1267 | struct segmented_address addr, | |
1268 | const void *orig_data, const void *data, | |
1269 | unsigned size) | |
1270 | { | |
9fa088f4 AK |
1271 | int rc; |
1272 | ulong linear; | |
1273 | ||
83b8795a | 1274 | rc = linearize(ctxt, addr, size, true, &linear); |
9fa088f4 AK |
1275 | if (rc != X86EMUL_CONTINUE) |
1276 | return rc; | |
0f65dd70 AK |
1277 | return ctxt->ops->cmpxchg_emulated(ctxt, linear, orig_data, data, |
1278 | size, &ctxt->exception); | |
3ca3ac4d AK |
1279 | } |
1280 | ||
dde7e6d1 | 1281 | static int pio_in_emulated(struct x86_emulate_ctxt *ctxt, |
dde7e6d1 AK |
1282 | unsigned int size, unsigned short port, |
1283 | void *dest) | |
1284 | { | |
9dac77fa | 1285 | struct read_cache *rc = &ctxt->io_read; |
b4c6abfe | 1286 | |
dde7e6d1 | 1287 | if (rc->pos == rc->end) { /* refill pio read ahead */ |
dde7e6d1 | 1288 | unsigned int in_page, n; |
9dac77fa | 1289 | unsigned int count = ctxt->rep_prefix ? |
dd856efa | 1290 | address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) : 1; |
dde7e6d1 | 1291 | in_page = (ctxt->eflags & EFLG_DF) ? |
dd856efa AK |
1292 | offset_in_page(reg_read(ctxt, VCPU_REGS_RDI)) : |
1293 | PAGE_SIZE - offset_in_page(reg_read(ctxt, VCPU_REGS_RDI)); | |
dde7e6d1 AK |
1294 | n = min(min(in_page, (unsigned int)sizeof(rc->data)) / size, |
1295 | count); | |
1296 | if (n == 0) | |
1297 | n = 1; | |
1298 | rc->pos = rc->end = 0; | |
7b105ca2 | 1299 | if (!ctxt->ops->pio_in_emulated(ctxt, size, port, rc->data, n)) |
dde7e6d1 AK |
1300 | return 0; |
1301 | rc->end = n * size; | |
6aa8b732 AK |
1302 | } |
1303 | ||
b3356bf0 GN |
1304 | if (ctxt->rep_prefix && !(ctxt->eflags & EFLG_DF)) { |
1305 | ctxt->dst.data = rc->data + rc->pos; | |
1306 | ctxt->dst.type = OP_MEM_STR; | |
1307 | ctxt->dst.count = (rc->end - rc->pos) / size; | |
1308 | rc->pos = rc->end; | |
1309 | } else { | |
1310 | memcpy(dest, rc->data + rc->pos, size); | |
1311 | rc->pos += size; | |
1312 | } | |
dde7e6d1 AK |
1313 | return 1; |
1314 | } | |
6aa8b732 | 1315 | |
7f3d35fd KW |
1316 | static int read_interrupt_descriptor(struct x86_emulate_ctxt *ctxt, |
1317 | u16 index, struct desc_struct *desc) | |
1318 | { | |
1319 | struct desc_ptr dt; | |
1320 | ulong addr; | |
1321 | ||
1322 | ctxt->ops->get_idt(ctxt, &dt); | |
1323 | ||
1324 | if (dt.size < index * 8 + 7) | |
1325 | return emulate_gp(ctxt, index << 3 | 0x2); | |
1326 | ||
1327 | addr = dt.address + index * 8; | |
1328 | return ctxt->ops->read_std(ctxt, addr, desc, sizeof *desc, | |
1329 | &ctxt->exception); | |
1330 | } | |
1331 | ||
dde7e6d1 | 1332 | static void get_descriptor_table_ptr(struct x86_emulate_ctxt *ctxt, |
dde7e6d1 AK |
1333 | u16 selector, struct desc_ptr *dt) |
1334 | { | |
0225fb50 | 1335 | const struct x86_emulate_ops *ops = ctxt->ops; |
7b105ca2 | 1336 | |
dde7e6d1 AK |
1337 | if (selector & 1 << 2) { |
1338 | struct desc_struct desc; | |
1aa36616 AK |
1339 | u16 sel; |
1340 | ||
dde7e6d1 | 1341 | memset (dt, 0, sizeof *dt); |
1aa36616 | 1342 | if (!ops->get_segment(ctxt, &sel, &desc, NULL, VCPU_SREG_LDTR)) |
dde7e6d1 | 1343 | return; |
e09d082c | 1344 | |
dde7e6d1 AK |
1345 | dt->size = desc_limit_scaled(&desc); /* what if limit > 65535? */ |
1346 | dt->address = get_desc_base(&desc); | |
1347 | } else | |
4bff1e86 | 1348 | ops->get_gdt(ctxt, dt); |
dde7e6d1 | 1349 | } |
120df890 | 1350 | |
dde7e6d1 AK |
1351 | /* allowed just for 8 bytes segments */ |
1352 | static int read_segment_descriptor(struct x86_emulate_ctxt *ctxt, | |
e919464b AK |
1353 | u16 selector, struct desc_struct *desc, |
1354 | ulong *desc_addr_p) | |
dde7e6d1 AK |
1355 | { |
1356 | struct desc_ptr dt; | |
1357 | u16 index = selector >> 3; | |
dde7e6d1 | 1358 | ulong addr; |
120df890 | 1359 | |
7b105ca2 | 1360 | get_descriptor_table_ptr(ctxt, selector, &dt); |
120df890 | 1361 | |
35d3d4a1 AK |
1362 | if (dt.size < index * 8 + 7) |
1363 | return emulate_gp(ctxt, selector & 0xfffc); | |
e09d082c | 1364 | |
e919464b | 1365 | *desc_addr_p = addr = dt.address + index * 8; |
7b105ca2 TY |
1366 | return ctxt->ops->read_std(ctxt, addr, desc, sizeof *desc, |
1367 | &ctxt->exception); | |
dde7e6d1 | 1368 | } |
ef65c889 | 1369 | |
dde7e6d1 AK |
1370 | /* allowed just for 8 bytes segments */ |
1371 | static int write_segment_descriptor(struct x86_emulate_ctxt *ctxt, | |
dde7e6d1 AK |
1372 | u16 selector, struct desc_struct *desc) |
1373 | { | |
1374 | struct desc_ptr dt; | |
1375 | u16 index = selector >> 3; | |
dde7e6d1 | 1376 | ulong addr; |
6aa8b732 | 1377 | |
7b105ca2 | 1378 | get_descriptor_table_ptr(ctxt, selector, &dt); |
6e3d5dfb | 1379 | |
35d3d4a1 AK |
1380 | if (dt.size < index * 8 + 7) |
1381 | return emulate_gp(ctxt, selector & 0xfffc); | |
6aa8b732 | 1382 | |
dde7e6d1 | 1383 | addr = dt.address + index * 8; |
7b105ca2 TY |
1384 | return ctxt->ops->write_std(ctxt, addr, desc, sizeof *desc, |
1385 | &ctxt->exception); | |
dde7e6d1 | 1386 | } |
c7e75a3d | 1387 | |
5601d05b | 1388 | /* Does not support long mode */ |
dde7e6d1 | 1389 | static int load_segment_descriptor(struct x86_emulate_ctxt *ctxt, |
dde7e6d1 AK |
1390 | u16 selector, int seg) |
1391 | { | |
869be99c | 1392 | struct desc_struct seg_desc, old_desc; |
dde7e6d1 AK |
1393 | u8 dpl, rpl, cpl; |
1394 | unsigned err_vec = GP_VECTOR; | |
1395 | u32 err_code = 0; | |
1396 | bool null_selector = !(selector & ~0x3); /* 0000-0003 are null */ | |
e919464b | 1397 | ulong desc_addr; |
dde7e6d1 | 1398 | int ret; |
03ebebeb | 1399 | u16 dummy; |
69f55cb1 | 1400 | |
dde7e6d1 | 1401 | memset(&seg_desc, 0, sizeof seg_desc); |
69f55cb1 | 1402 | |
dde7e6d1 AK |
1403 | if ((seg <= VCPU_SREG_GS && ctxt->mode == X86EMUL_MODE_VM86) |
1404 | || ctxt->mode == X86EMUL_MODE_REAL) { | |
1405 | /* set real mode segment descriptor */ | |
03ebebeb | 1406 | ctxt->ops->get_segment(ctxt, &dummy, &seg_desc, NULL, seg); |
dde7e6d1 | 1407 | set_desc_base(&seg_desc, selector << 4); |
dde7e6d1 AK |
1408 | goto load; |
1409 | } | |
1410 | ||
79d5b4c3 AK |
1411 | rpl = selector & 3; |
1412 | cpl = ctxt->ops->cpl(ctxt); | |
1413 | ||
1414 | /* NULL selector is not valid for TR, CS and SS (except for long mode) */ | |
1415 | if ((seg == VCPU_SREG_CS | |
1416 | || (seg == VCPU_SREG_SS | |
1417 | && (ctxt->mode != X86EMUL_MODE_PROT64 || rpl != cpl)) | |
1418 | || seg == VCPU_SREG_TR) | |
dde7e6d1 AK |
1419 | && null_selector) |
1420 | goto exception; | |
1421 | ||
1422 | /* TR should be in GDT only */ | |
1423 | if (seg == VCPU_SREG_TR && (selector & (1 << 2))) | |
1424 | goto exception; | |
1425 | ||
1426 | if (null_selector) /* for NULL selector skip all following checks */ | |
1427 | goto load; | |
1428 | ||
e919464b | 1429 | ret = read_segment_descriptor(ctxt, selector, &seg_desc, &desc_addr); |
dde7e6d1 AK |
1430 | if (ret != X86EMUL_CONTINUE) |
1431 | return ret; | |
1432 | ||
1433 | err_code = selector & 0xfffc; | |
1434 | err_vec = GP_VECTOR; | |
1435 | ||
fc058680 | 1436 | /* can't load system descriptor into segment selector */ |
dde7e6d1 AK |
1437 | if (seg <= VCPU_SREG_GS && !seg_desc.s) |
1438 | goto exception; | |
1439 | ||
1440 | if (!seg_desc.p) { | |
1441 | err_vec = (seg == VCPU_SREG_SS) ? SS_VECTOR : NP_VECTOR; | |
1442 | goto exception; | |
1443 | } | |
1444 | ||
dde7e6d1 | 1445 | dpl = seg_desc.dpl; |
dde7e6d1 AK |
1446 | |
1447 | switch (seg) { | |
1448 | case VCPU_SREG_SS: | |
1449 | /* | |
1450 | * segment is not a writable data segment or segment | |
1451 | * selector's RPL != CPL or segment selector's RPL != CPL | |
1452 | */ | |
1453 | if (rpl != cpl || (seg_desc.type & 0xa) != 0x2 || dpl != cpl) | |
1454 | goto exception; | |
6aa8b732 | 1455 | break; |
dde7e6d1 AK |
1456 | case VCPU_SREG_CS: |
1457 | if (!(seg_desc.type & 8)) | |
1458 | goto exception; | |
1459 | ||
1460 | if (seg_desc.type & 4) { | |
1461 | /* conforming */ | |
1462 | if (dpl > cpl) | |
1463 | goto exception; | |
1464 | } else { | |
1465 | /* nonconforming */ | |
1466 | if (rpl > cpl || dpl != cpl) | |
1467 | goto exception; | |
1468 | } | |
1469 | /* CS(RPL) <- CPL */ | |
1470 | selector = (selector & 0xfffc) | cpl; | |
6aa8b732 | 1471 | break; |
dde7e6d1 AK |
1472 | case VCPU_SREG_TR: |
1473 | if (seg_desc.s || (seg_desc.type != 1 && seg_desc.type != 9)) | |
1474 | goto exception; | |
869be99c AK |
1475 | old_desc = seg_desc; |
1476 | seg_desc.type |= 2; /* busy */ | |
1477 | ret = ctxt->ops->cmpxchg_emulated(ctxt, desc_addr, &old_desc, &seg_desc, | |
1478 | sizeof(seg_desc), &ctxt->exception); | |
1479 | if (ret != X86EMUL_CONTINUE) | |
1480 | return ret; | |
dde7e6d1 AK |
1481 | break; |
1482 | case VCPU_SREG_LDTR: | |
1483 | if (seg_desc.s || seg_desc.type != 2) | |
1484 | goto exception; | |
1485 | break; | |
1486 | default: /* DS, ES, FS, or GS */ | |
4e62417b | 1487 | /* |
dde7e6d1 AK |
1488 | * segment is not a data or readable code segment or |
1489 | * ((segment is a data or nonconforming code segment) | |
1490 | * and (both RPL and CPL > DPL)) | |
4e62417b | 1491 | */ |
dde7e6d1 AK |
1492 | if ((seg_desc.type & 0xa) == 0x8 || |
1493 | (((seg_desc.type & 0xc) != 0xc) && | |
1494 | (rpl > dpl && cpl > dpl))) | |
1495 | goto exception; | |
6aa8b732 | 1496 | break; |
dde7e6d1 AK |
1497 | } |
1498 | ||
1499 | if (seg_desc.s) { | |
1500 | /* mark segment as accessed */ | |
1501 | seg_desc.type |= 1; | |
7b105ca2 | 1502 | ret = write_segment_descriptor(ctxt, selector, &seg_desc); |
dde7e6d1 AK |
1503 | if (ret != X86EMUL_CONTINUE) |
1504 | return ret; | |
1505 | } | |
1506 | load: | |
7b105ca2 | 1507 | ctxt->ops->set_segment(ctxt, selector, &seg_desc, 0, seg); |
dde7e6d1 AK |
1508 | return X86EMUL_CONTINUE; |
1509 | exception: | |
1510 | emulate_exception(ctxt, err_vec, err_code, true); | |
1511 | return X86EMUL_PROPAGATE_FAULT; | |
1512 | } | |
1513 | ||
31be40b3 WY |
1514 | static void write_register_operand(struct operand *op) |
1515 | { | |
1516 | /* The 4-byte case *is* correct: in 64-bit mode we zero-extend. */ | |
1517 | switch (op->bytes) { | |
1518 | case 1: | |
1519 | *(u8 *)op->addr.reg = (u8)op->val; | |
1520 | break; | |
1521 | case 2: | |
1522 | *(u16 *)op->addr.reg = (u16)op->val; | |
1523 | break; | |
1524 | case 4: | |
1525 | *op->addr.reg = (u32)op->val; | |
1526 | break; /* 64b: zero-extend */ | |
1527 | case 8: | |
1528 | *op->addr.reg = op->val; | |
1529 | break; | |
1530 | } | |
1531 | } | |
1532 | ||
adddcecf | 1533 | static int writeback(struct x86_emulate_ctxt *ctxt) |
dde7e6d1 AK |
1534 | { |
1535 | int rc; | |
dde7e6d1 | 1536 | |
9dac77fa | 1537 | switch (ctxt->dst.type) { |
dde7e6d1 | 1538 | case OP_REG: |
9dac77fa | 1539 | write_register_operand(&ctxt->dst); |
6aa8b732 | 1540 | break; |
dde7e6d1 | 1541 | case OP_MEM: |
9dac77fa | 1542 | if (ctxt->lock_prefix) |
3ca3ac4d | 1543 | rc = segmented_cmpxchg(ctxt, |
9dac77fa AK |
1544 | ctxt->dst.addr.mem, |
1545 | &ctxt->dst.orig_val, | |
1546 | &ctxt->dst.val, | |
1547 | ctxt->dst.bytes); | |
341de7e3 | 1548 | else |
3ca3ac4d | 1549 | rc = segmented_write(ctxt, |
9dac77fa AK |
1550 | ctxt->dst.addr.mem, |
1551 | &ctxt->dst.val, | |
1552 | ctxt->dst.bytes); | |
dde7e6d1 AK |
1553 | if (rc != X86EMUL_CONTINUE) |
1554 | return rc; | |
a682e354 | 1555 | break; |
b3356bf0 GN |
1556 | case OP_MEM_STR: |
1557 | rc = segmented_write(ctxt, | |
1558 | ctxt->dst.addr.mem, | |
1559 | ctxt->dst.data, | |
1560 | ctxt->dst.bytes * ctxt->dst.count); | |
1561 | if (rc != X86EMUL_CONTINUE) | |
1562 | return rc; | |
1563 | break; | |
1253791d | 1564 | case OP_XMM: |
9dac77fa | 1565 | write_sse_reg(ctxt, &ctxt->dst.vec_val, ctxt->dst.addr.xmm); |
1253791d | 1566 | break; |
cbe2c9d3 AK |
1567 | case OP_MM: |
1568 | write_mmx_reg(ctxt, &ctxt->dst.mm_val, ctxt->dst.addr.mm); | |
1569 | break; | |
dde7e6d1 AK |
1570 | case OP_NONE: |
1571 | /* no writeback */ | |
414e6277 | 1572 | break; |
dde7e6d1 | 1573 | default: |
414e6277 | 1574 | break; |
6aa8b732 | 1575 | } |
dde7e6d1 AK |
1576 | return X86EMUL_CONTINUE; |
1577 | } | |
6aa8b732 | 1578 | |
51ddff50 | 1579 | static int push(struct x86_emulate_ctxt *ctxt, void *data, int bytes) |
dde7e6d1 | 1580 | { |
4179bb02 | 1581 | struct segmented_address addr; |
0dc8d10f | 1582 | |
5ad105e5 | 1583 | rsp_increment(ctxt, -bytes); |
dd856efa | 1584 | addr.ea = reg_read(ctxt, VCPU_REGS_RSP) & stack_mask(ctxt); |
4179bb02 TY |
1585 | addr.seg = VCPU_SREG_SS; |
1586 | ||
51ddff50 AK |
1587 | return segmented_write(ctxt, addr, data, bytes); |
1588 | } | |
1589 | ||
1590 | static int em_push(struct x86_emulate_ctxt *ctxt) | |
1591 | { | |
4179bb02 | 1592 | /* Disable writeback. */ |
9dac77fa | 1593 | ctxt->dst.type = OP_NONE; |
51ddff50 | 1594 | return push(ctxt, &ctxt->src.val, ctxt->op_bytes); |
dde7e6d1 | 1595 | } |
69f55cb1 | 1596 | |
dde7e6d1 | 1597 | static int emulate_pop(struct x86_emulate_ctxt *ctxt, |
dde7e6d1 AK |
1598 | void *dest, int len) |
1599 | { | |
dde7e6d1 | 1600 | int rc; |
90de84f5 | 1601 | struct segmented_address addr; |
8b4caf66 | 1602 | |
dd856efa | 1603 | addr.ea = reg_read(ctxt, VCPU_REGS_RSP) & stack_mask(ctxt); |
90de84f5 | 1604 | addr.seg = VCPU_SREG_SS; |
3ca3ac4d | 1605 | rc = segmented_read(ctxt, addr, dest, len); |
dde7e6d1 AK |
1606 | if (rc != X86EMUL_CONTINUE) |
1607 | return rc; | |
1608 | ||
5ad105e5 | 1609 | rsp_increment(ctxt, len); |
dde7e6d1 | 1610 | return rc; |
8b4caf66 LV |
1611 | } |
1612 | ||
c54fe504 TY |
1613 | static int em_pop(struct x86_emulate_ctxt *ctxt) |
1614 | { | |
9dac77fa | 1615 | return emulate_pop(ctxt, &ctxt->dst.val, ctxt->op_bytes); |
c54fe504 TY |
1616 | } |
1617 | ||
dde7e6d1 | 1618 | static int emulate_popf(struct x86_emulate_ctxt *ctxt, |
7b105ca2 | 1619 | void *dest, int len) |
9de41573 GN |
1620 | { |
1621 | int rc; | |
dde7e6d1 AK |
1622 | unsigned long val, change_mask; |
1623 | int iopl = (ctxt->eflags & X86_EFLAGS_IOPL) >> IOPL_SHIFT; | |
7b105ca2 | 1624 | int cpl = ctxt->ops->cpl(ctxt); |
9de41573 | 1625 | |
3b9be3bf | 1626 | rc = emulate_pop(ctxt, &val, len); |
dde7e6d1 AK |
1627 | if (rc != X86EMUL_CONTINUE) |
1628 | return rc; | |
9de41573 | 1629 | |
dde7e6d1 AK |
1630 | change_mask = EFLG_CF | EFLG_PF | EFLG_AF | EFLG_ZF | EFLG_SF | EFLG_OF |
1631 | | EFLG_TF | EFLG_DF | EFLG_NT | EFLG_RF | EFLG_AC | EFLG_ID; | |
9de41573 | 1632 | |
dde7e6d1 AK |
1633 | switch(ctxt->mode) { |
1634 | case X86EMUL_MODE_PROT64: | |
1635 | case X86EMUL_MODE_PROT32: | |
1636 | case X86EMUL_MODE_PROT16: | |
1637 | if (cpl == 0) | |
1638 | change_mask |= EFLG_IOPL; | |
1639 | if (cpl <= iopl) | |
1640 | change_mask |= EFLG_IF; | |
1641 | break; | |
1642 | case X86EMUL_MODE_VM86: | |
35d3d4a1 AK |
1643 | if (iopl < 3) |
1644 | return emulate_gp(ctxt, 0); | |
dde7e6d1 AK |
1645 | change_mask |= EFLG_IF; |
1646 | break; | |
1647 | default: /* real mode */ | |
1648 | change_mask |= (EFLG_IOPL | EFLG_IF); | |
1649 | break; | |
9de41573 | 1650 | } |
dde7e6d1 AK |
1651 | |
1652 | *(unsigned long *)dest = | |
1653 | (ctxt->eflags & ~change_mask) | (val & change_mask); | |
1654 | ||
1655 | return rc; | |
9de41573 GN |
1656 | } |
1657 | ||
62aaa2f0 TY |
1658 | static int em_popf(struct x86_emulate_ctxt *ctxt) |
1659 | { | |
9dac77fa AK |
1660 | ctxt->dst.type = OP_REG; |
1661 | ctxt->dst.addr.reg = &ctxt->eflags; | |
1662 | ctxt->dst.bytes = ctxt->op_bytes; | |
1663 | return emulate_popf(ctxt, &ctxt->dst.val, ctxt->op_bytes); | |
62aaa2f0 TY |
1664 | } |
1665 | ||
612e89f0 AK |
1666 | static int em_enter(struct x86_emulate_ctxt *ctxt) |
1667 | { | |
1668 | int rc; | |
1669 | unsigned frame_size = ctxt->src.val; | |
1670 | unsigned nesting_level = ctxt->src2.val & 31; | |
dd856efa | 1671 | ulong rbp; |
612e89f0 AK |
1672 | |
1673 | if (nesting_level) | |
1674 | return X86EMUL_UNHANDLEABLE; | |
1675 | ||
dd856efa AK |
1676 | rbp = reg_read(ctxt, VCPU_REGS_RBP); |
1677 | rc = push(ctxt, &rbp, stack_size(ctxt)); | |
612e89f0 AK |
1678 | if (rc != X86EMUL_CONTINUE) |
1679 | return rc; | |
dd856efa | 1680 | assign_masked(reg_rmw(ctxt, VCPU_REGS_RBP), reg_read(ctxt, VCPU_REGS_RSP), |
612e89f0 | 1681 | stack_mask(ctxt)); |
dd856efa AK |
1682 | assign_masked(reg_rmw(ctxt, VCPU_REGS_RSP), |
1683 | reg_read(ctxt, VCPU_REGS_RSP) - frame_size, | |
612e89f0 AK |
1684 | stack_mask(ctxt)); |
1685 | return X86EMUL_CONTINUE; | |
1686 | } | |
1687 | ||
f47cfa31 AK |
1688 | static int em_leave(struct x86_emulate_ctxt *ctxt) |
1689 | { | |
dd856efa | 1690 | assign_masked(reg_rmw(ctxt, VCPU_REGS_RSP), reg_read(ctxt, VCPU_REGS_RBP), |
f47cfa31 | 1691 | stack_mask(ctxt)); |
dd856efa | 1692 | return emulate_pop(ctxt, reg_rmw(ctxt, VCPU_REGS_RBP), ctxt->op_bytes); |
f47cfa31 AK |
1693 | } |
1694 | ||
1cd196ea | 1695 | static int em_push_sreg(struct x86_emulate_ctxt *ctxt) |
7b262e90 | 1696 | { |
1cd196ea AK |
1697 | int seg = ctxt->src2.val; |
1698 | ||
9dac77fa | 1699 | ctxt->src.val = get_segment_selector(ctxt, seg); |
7b262e90 | 1700 | |
4487b3b4 | 1701 | return em_push(ctxt); |
7b262e90 GN |
1702 | } |
1703 | ||
1cd196ea | 1704 | static int em_pop_sreg(struct x86_emulate_ctxt *ctxt) |
38ba30ba | 1705 | { |
1cd196ea | 1706 | int seg = ctxt->src2.val; |
dde7e6d1 AK |
1707 | unsigned long selector; |
1708 | int rc; | |
38ba30ba | 1709 | |
9dac77fa | 1710 | rc = emulate_pop(ctxt, &selector, ctxt->op_bytes); |
dde7e6d1 AK |
1711 | if (rc != X86EMUL_CONTINUE) |
1712 | return rc; | |
1713 | ||
7b105ca2 | 1714 | rc = load_segment_descriptor(ctxt, (u16)selector, seg); |
dde7e6d1 | 1715 | return rc; |
38ba30ba GN |
1716 | } |
1717 | ||
b96a7fad | 1718 | static int em_pusha(struct x86_emulate_ctxt *ctxt) |
38ba30ba | 1719 | { |
dd856efa | 1720 | unsigned long old_esp = reg_read(ctxt, VCPU_REGS_RSP); |
dde7e6d1 AK |
1721 | int rc = X86EMUL_CONTINUE; |
1722 | int reg = VCPU_REGS_RAX; | |
38ba30ba | 1723 | |
dde7e6d1 AK |
1724 | while (reg <= VCPU_REGS_RDI) { |
1725 | (reg == VCPU_REGS_RSP) ? | |
dd856efa | 1726 | (ctxt->src.val = old_esp) : (ctxt->src.val = reg_read(ctxt, reg)); |
38ba30ba | 1727 | |
4487b3b4 | 1728 | rc = em_push(ctxt); |
dde7e6d1 AK |
1729 | if (rc != X86EMUL_CONTINUE) |
1730 | return rc; | |
38ba30ba | 1731 | |
dde7e6d1 | 1732 | ++reg; |
38ba30ba | 1733 | } |
38ba30ba | 1734 | |
dde7e6d1 | 1735 | return rc; |
38ba30ba GN |
1736 | } |
1737 | ||
62aaa2f0 TY |
1738 | static int em_pushf(struct x86_emulate_ctxt *ctxt) |
1739 | { | |
9dac77fa | 1740 | ctxt->src.val = (unsigned long)ctxt->eflags; |
62aaa2f0 TY |
1741 | return em_push(ctxt); |
1742 | } | |
1743 | ||
b96a7fad | 1744 | static int em_popa(struct x86_emulate_ctxt *ctxt) |
38ba30ba | 1745 | { |
dde7e6d1 AK |
1746 | int rc = X86EMUL_CONTINUE; |
1747 | int reg = VCPU_REGS_RDI; | |
38ba30ba | 1748 | |
dde7e6d1 AK |
1749 | while (reg >= VCPU_REGS_RAX) { |
1750 | if (reg == VCPU_REGS_RSP) { | |
5ad105e5 | 1751 | rsp_increment(ctxt, ctxt->op_bytes); |
dde7e6d1 AK |
1752 | --reg; |
1753 | } | |
38ba30ba | 1754 | |
dd856efa | 1755 | rc = emulate_pop(ctxt, reg_rmw(ctxt, reg), ctxt->op_bytes); |
dde7e6d1 AK |
1756 | if (rc != X86EMUL_CONTINUE) |
1757 | break; | |
1758 | --reg; | |
38ba30ba | 1759 | } |
dde7e6d1 | 1760 | return rc; |
38ba30ba GN |
1761 | } |
1762 | ||
dd856efa | 1763 | static int __emulate_int_real(struct x86_emulate_ctxt *ctxt, int irq) |
6e154e56 | 1764 | { |
0225fb50 | 1765 | const struct x86_emulate_ops *ops = ctxt->ops; |
5c56e1cf | 1766 | int rc; |
6e154e56 MG |
1767 | struct desc_ptr dt; |
1768 | gva_t cs_addr; | |
1769 | gva_t eip_addr; | |
1770 | u16 cs, eip; | |
6e154e56 MG |
1771 | |
1772 | /* TODO: Add limit checks */ | |
9dac77fa | 1773 | ctxt->src.val = ctxt->eflags; |
4487b3b4 | 1774 | rc = em_push(ctxt); |
5c56e1cf AK |
1775 | if (rc != X86EMUL_CONTINUE) |
1776 | return rc; | |
6e154e56 MG |
1777 | |
1778 | ctxt->eflags &= ~(EFLG_IF | EFLG_TF | EFLG_AC); | |
1779 | ||
9dac77fa | 1780 | ctxt->src.val = get_segment_selector(ctxt, VCPU_SREG_CS); |
4487b3b4 | 1781 | rc = em_push(ctxt); |
5c56e1cf AK |
1782 | if (rc != X86EMUL_CONTINUE) |
1783 | return rc; | |
6e154e56 | 1784 | |
9dac77fa | 1785 | ctxt->src.val = ctxt->_eip; |
4487b3b4 | 1786 | rc = em_push(ctxt); |
5c56e1cf AK |
1787 | if (rc != X86EMUL_CONTINUE) |
1788 | return rc; | |
1789 | ||
4bff1e86 | 1790 | ops->get_idt(ctxt, &dt); |
6e154e56 MG |
1791 | |
1792 | eip_addr = dt.address + (irq << 2); | |
1793 | cs_addr = dt.address + (irq << 2) + 2; | |
1794 | ||
0f65dd70 | 1795 | rc = ops->read_std(ctxt, cs_addr, &cs, 2, &ctxt->exception); |
6e154e56 MG |
1796 | if (rc != X86EMUL_CONTINUE) |
1797 | return rc; | |
1798 | ||
0f65dd70 | 1799 | rc = ops->read_std(ctxt, eip_addr, &eip, 2, &ctxt->exception); |
6e154e56 MG |
1800 | if (rc != X86EMUL_CONTINUE) |
1801 | return rc; | |
1802 | ||
7b105ca2 | 1803 | rc = load_segment_descriptor(ctxt, cs, VCPU_SREG_CS); |
6e154e56 MG |
1804 | if (rc != X86EMUL_CONTINUE) |
1805 | return rc; | |
1806 | ||
9dac77fa | 1807 | ctxt->_eip = eip; |
6e154e56 MG |
1808 | |
1809 | return rc; | |
1810 | } | |
1811 | ||
dd856efa AK |
1812 | int emulate_int_real(struct x86_emulate_ctxt *ctxt, int irq) |
1813 | { | |
1814 | int rc; | |
1815 | ||
1816 | invalidate_registers(ctxt); | |
1817 | rc = __emulate_int_real(ctxt, irq); | |
1818 | if (rc == X86EMUL_CONTINUE) | |
1819 | writeback_registers(ctxt); | |
1820 | return rc; | |
1821 | } | |
1822 | ||
7b105ca2 | 1823 | static int emulate_int(struct x86_emulate_ctxt *ctxt, int irq) |
6e154e56 MG |
1824 | { |
1825 | switch(ctxt->mode) { | |
1826 | case X86EMUL_MODE_REAL: | |
dd856efa | 1827 | return __emulate_int_real(ctxt, irq); |
6e154e56 MG |
1828 | case X86EMUL_MODE_VM86: |
1829 | case X86EMUL_MODE_PROT16: | |
1830 | case X86EMUL_MODE_PROT32: | |
1831 | case X86EMUL_MODE_PROT64: | |
1832 | default: | |
1833 | /* Protected mode interrupts unimplemented yet */ | |
1834 | return X86EMUL_UNHANDLEABLE; | |
1835 | } | |
1836 | } | |
1837 | ||
7b105ca2 | 1838 | static int emulate_iret_real(struct x86_emulate_ctxt *ctxt) |
38ba30ba | 1839 | { |
dde7e6d1 AK |
1840 | int rc = X86EMUL_CONTINUE; |
1841 | unsigned long temp_eip = 0; | |
1842 | unsigned long temp_eflags = 0; | |
1843 | unsigned long cs = 0; | |
1844 | unsigned long mask = EFLG_CF | EFLG_PF | EFLG_AF | EFLG_ZF | EFLG_SF | EFLG_TF | | |
1845 | EFLG_IF | EFLG_DF | EFLG_OF | EFLG_IOPL | EFLG_NT | EFLG_RF | | |
1846 | EFLG_AC | EFLG_ID | (1 << 1); /* Last one is the reserved bit */ | |
1847 | unsigned long vm86_mask = EFLG_VM | EFLG_VIF | EFLG_VIP; | |
38ba30ba | 1848 | |
dde7e6d1 | 1849 | /* TODO: Add stack limit check */ |
38ba30ba | 1850 | |
9dac77fa | 1851 | rc = emulate_pop(ctxt, &temp_eip, ctxt->op_bytes); |
38ba30ba | 1852 | |
dde7e6d1 AK |
1853 | if (rc != X86EMUL_CONTINUE) |
1854 | return rc; | |
38ba30ba | 1855 | |
35d3d4a1 AK |
1856 | if (temp_eip & ~0xffff) |
1857 | return emulate_gp(ctxt, 0); | |
38ba30ba | 1858 | |
9dac77fa | 1859 | rc = emulate_pop(ctxt, &cs, ctxt->op_bytes); |
38ba30ba | 1860 | |
dde7e6d1 AK |
1861 | if (rc != X86EMUL_CONTINUE) |
1862 | return rc; | |
38ba30ba | 1863 | |
9dac77fa | 1864 | rc = emulate_pop(ctxt, &temp_eflags, ctxt->op_bytes); |
38ba30ba | 1865 | |
dde7e6d1 AK |
1866 | if (rc != X86EMUL_CONTINUE) |
1867 | return rc; | |
38ba30ba | 1868 | |
7b105ca2 | 1869 | rc = load_segment_descriptor(ctxt, (u16)cs, VCPU_SREG_CS); |
38ba30ba | 1870 | |
dde7e6d1 AK |
1871 | if (rc != X86EMUL_CONTINUE) |
1872 | return rc; | |
38ba30ba | 1873 | |
9dac77fa | 1874 | ctxt->_eip = temp_eip; |
38ba30ba | 1875 | |
38ba30ba | 1876 | |
9dac77fa | 1877 | if (ctxt->op_bytes == 4) |
dde7e6d1 | 1878 | ctxt->eflags = ((temp_eflags & mask) | (ctxt->eflags & vm86_mask)); |
9dac77fa | 1879 | else if (ctxt->op_bytes == 2) { |
dde7e6d1 AK |
1880 | ctxt->eflags &= ~0xffff; |
1881 | ctxt->eflags |= temp_eflags; | |
38ba30ba | 1882 | } |
dde7e6d1 AK |
1883 | |
1884 | ctxt->eflags &= ~EFLG_RESERVED_ZEROS_MASK; /* Clear reserved zeros */ | |
1885 | ctxt->eflags |= EFLG_RESERVED_ONE_MASK; | |
1886 | ||
1887 | return rc; | |
38ba30ba GN |
1888 | } |
1889 | ||
e01991e7 | 1890 | static int em_iret(struct x86_emulate_ctxt *ctxt) |
c37eda13 | 1891 | { |
dde7e6d1 AK |
1892 | switch(ctxt->mode) { |
1893 | case X86EMUL_MODE_REAL: | |
7b105ca2 | 1894 | return emulate_iret_real(ctxt); |
dde7e6d1 AK |
1895 | case X86EMUL_MODE_VM86: |
1896 | case X86EMUL_MODE_PROT16: | |
1897 | case X86EMUL_MODE_PROT32: | |
1898 | case X86EMUL_MODE_PROT64: | |
c37eda13 | 1899 | default: |
dde7e6d1 AK |
1900 | /* iret from protected mode unimplemented yet */ |
1901 | return X86EMUL_UNHANDLEABLE; | |
c37eda13 | 1902 | } |
c37eda13 WY |
1903 | } |
1904 | ||
d2f62766 TY |
1905 | static int em_jmp_far(struct x86_emulate_ctxt *ctxt) |
1906 | { | |
d2f62766 TY |
1907 | int rc; |
1908 | unsigned short sel; | |
1909 | ||
9dac77fa | 1910 | memcpy(&sel, ctxt->src.valptr + ctxt->op_bytes, 2); |
d2f62766 | 1911 | |
7b105ca2 | 1912 | rc = load_segment_descriptor(ctxt, sel, VCPU_SREG_CS); |
d2f62766 TY |
1913 | if (rc != X86EMUL_CONTINUE) |
1914 | return rc; | |
1915 | ||
9dac77fa AK |
1916 | ctxt->_eip = 0; |
1917 | memcpy(&ctxt->_eip, ctxt->src.valptr, ctxt->op_bytes); | |
d2f62766 TY |
1918 | return X86EMUL_CONTINUE; |
1919 | } | |
1920 | ||
51187683 | 1921 | static int em_grp2(struct x86_emulate_ctxt *ctxt) |
8cdbd2c9 | 1922 | { |
9dac77fa | 1923 | switch (ctxt->modrm_reg) { |
8cdbd2c9 | 1924 | case 0: /* rol */ |
a31b9cea | 1925 | emulate_2op_SrcB(ctxt, "rol"); |
8cdbd2c9 LV |
1926 | break; |
1927 | case 1: /* ror */ | |
a31b9cea | 1928 | emulate_2op_SrcB(ctxt, "ror"); |
8cdbd2c9 LV |
1929 | break; |
1930 | case 2: /* rcl */ | |
a31b9cea | 1931 | emulate_2op_SrcB(ctxt, "rcl"); |
8cdbd2c9 LV |
1932 | break; |
1933 | case 3: /* rcr */ | |
a31b9cea | 1934 | emulate_2op_SrcB(ctxt, "rcr"); |
8cdbd2c9 LV |
1935 | break; |
1936 | case 4: /* sal/shl */ | |
1937 | case 6: /* sal/shl */ | |
a31b9cea | 1938 | emulate_2op_SrcB(ctxt, "sal"); |
8cdbd2c9 LV |
1939 | break; |
1940 | case 5: /* shr */ | |
a31b9cea | 1941 | emulate_2op_SrcB(ctxt, "shr"); |
8cdbd2c9 LV |
1942 | break; |
1943 | case 7: /* sar */ | |
a31b9cea | 1944 | emulate_2op_SrcB(ctxt, "sar"); |
8cdbd2c9 LV |
1945 | break; |
1946 | } | |
51187683 | 1947 | return X86EMUL_CONTINUE; |
8cdbd2c9 LV |
1948 | } |
1949 | ||
3329ece1 AK |
1950 | static int em_not(struct x86_emulate_ctxt *ctxt) |
1951 | { | |
1952 | ctxt->dst.val = ~ctxt->dst.val; | |
1953 | return X86EMUL_CONTINUE; | |
1954 | } | |
1955 | ||
1956 | static int em_neg(struct x86_emulate_ctxt *ctxt) | |
1957 | { | |
1958 | emulate_1op(ctxt, "neg"); | |
1959 | return X86EMUL_CONTINUE; | |
1960 | } | |
1961 | ||
1962 | static int em_mul_ex(struct x86_emulate_ctxt *ctxt) | |
1963 | { | |
1964 | u8 ex = 0; | |
1965 | ||
1966 | emulate_1op_rax_rdx(ctxt, "mul", ex); | |
1967 | return X86EMUL_CONTINUE; | |
1968 | } | |
1969 | ||
1970 | static int em_imul_ex(struct x86_emulate_ctxt *ctxt) | |
1971 | { | |
1972 | u8 ex = 0; | |
1973 | ||
1974 | emulate_1op_rax_rdx(ctxt, "imul", ex); | |
1975 | return X86EMUL_CONTINUE; | |
1976 | } | |
1977 | ||
1978 | static int em_div_ex(struct x86_emulate_ctxt *ctxt) | |
8cdbd2c9 | 1979 | { |
34d1f490 | 1980 | u8 de = 0; |
8cdbd2c9 | 1981 | |
3329ece1 AK |
1982 | emulate_1op_rax_rdx(ctxt, "div", de); |
1983 | if (de) | |
1984 | return emulate_de(ctxt); | |
1985 | return X86EMUL_CONTINUE; | |
1986 | } | |
1987 | ||
1988 | static int em_idiv_ex(struct x86_emulate_ctxt *ctxt) | |
1989 | { | |
1990 | u8 de = 0; | |
1991 | ||
1992 | emulate_1op_rax_rdx(ctxt, "idiv", de); | |
34d1f490 AK |
1993 | if (de) |
1994 | return emulate_de(ctxt); | |
8c5eee30 | 1995 | return X86EMUL_CONTINUE; |
8cdbd2c9 LV |
1996 | } |
1997 | ||
51187683 | 1998 | static int em_grp45(struct x86_emulate_ctxt *ctxt) |
8cdbd2c9 | 1999 | { |
4179bb02 | 2000 | int rc = X86EMUL_CONTINUE; |
8cdbd2c9 | 2001 | |
9dac77fa | 2002 | switch (ctxt->modrm_reg) { |
8cdbd2c9 | 2003 | case 0: /* inc */ |
d1eef45d | 2004 | emulate_1op(ctxt, "inc"); |
8cdbd2c9 LV |
2005 | break; |
2006 | case 1: /* dec */ | |
d1eef45d | 2007 | emulate_1op(ctxt, "dec"); |
8cdbd2c9 | 2008 | break; |
d19292e4 MG |
2009 | case 2: /* call near abs */ { |
2010 | long int old_eip; | |
9dac77fa AK |
2011 | old_eip = ctxt->_eip; |
2012 | ctxt->_eip = ctxt->src.val; | |
2013 | ctxt->src.val = old_eip; | |
4487b3b4 | 2014 | rc = em_push(ctxt); |
d19292e4 MG |
2015 | break; |
2016 | } | |
8cdbd2c9 | 2017 | case 4: /* jmp abs */ |
9dac77fa | 2018 | ctxt->_eip = ctxt->src.val; |
8cdbd2c9 | 2019 | break; |
d2f62766 TY |
2020 | case 5: /* jmp far */ |
2021 | rc = em_jmp_far(ctxt); | |
2022 | break; | |
8cdbd2c9 | 2023 | case 6: /* push */ |
4487b3b4 | 2024 | rc = em_push(ctxt); |
8cdbd2c9 | 2025 | break; |
8cdbd2c9 | 2026 | } |
4179bb02 | 2027 | return rc; |
8cdbd2c9 LV |
2028 | } |
2029 | ||
e0dac408 | 2030 | static int em_cmpxchg8b(struct x86_emulate_ctxt *ctxt) |
8cdbd2c9 | 2031 | { |
9dac77fa | 2032 | u64 old = ctxt->dst.orig_val64; |
8cdbd2c9 | 2033 | |
dd856efa AK |
2034 | if (((u32) (old >> 0) != (u32) reg_read(ctxt, VCPU_REGS_RAX)) || |
2035 | ((u32) (old >> 32) != (u32) reg_read(ctxt, VCPU_REGS_RDX))) { | |
2036 | *reg_write(ctxt, VCPU_REGS_RAX) = (u32) (old >> 0); | |
2037 | *reg_write(ctxt, VCPU_REGS_RDX) = (u32) (old >> 32); | |
05f086f8 | 2038 | ctxt->eflags &= ~EFLG_ZF; |
8cdbd2c9 | 2039 | } else { |
dd856efa AK |
2040 | ctxt->dst.val64 = ((u64)reg_read(ctxt, VCPU_REGS_RCX) << 32) | |
2041 | (u32) reg_read(ctxt, VCPU_REGS_RBX); | |
8cdbd2c9 | 2042 | |
05f086f8 | 2043 | ctxt->eflags |= EFLG_ZF; |
8cdbd2c9 | 2044 | } |
1b30eaa8 | 2045 | return X86EMUL_CONTINUE; |
8cdbd2c9 LV |
2046 | } |
2047 | ||
ebda02c2 TY |
2048 | static int em_ret(struct x86_emulate_ctxt *ctxt) |
2049 | { | |
9dac77fa AK |
2050 | ctxt->dst.type = OP_REG; |
2051 | ctxt->dst.addr.reg = &ctxt->_eip; | |
2052 | ctxt->dst.bytes = ctxt->op_bytes; | |
ebda02c2 TY |
2053 | return em_pop(ctxt); |
2054 | } | |
2055 | ||
e01991e7 | 2056 | static int em_ret_far(struct x86_emulate_ctxt *ctxt) |
a77ab5ea | 2057 | { |
a77ab5ea AK |
2058 | int rc; |
2059 | unsigned long cs; | |
2060 | ||
9dac77fa | 2061 | rc = emulate_pop(ctxt, &ctxt->_eip, ctxt->op_bytes); |
1b30eaa8 | 2062 | if (rc != X86EMUL_CONTINUE) |
a77ab5ea | 2063 | return rc; |
9dac77fa AK |
2064 | if (ctxt->op_bytes == 4) |
2065 | ctxt->_eip = (u32)ctxt->_eip; | |
2066 | rc = emulate_pop(ctxt, &cs, ctxt->op_bytes); | |
1b30eaa8 | 2067 | if (rc != X86EMUL_CONTINUE) |
a77ab5ea | 2068 | return rc; |
7b105ca2 | 2069 | rc = load_segment_descriptor(ctxt, (u16)cs, VCPU_SREG_CS); |
a77ab5ea AK |
2070 | return rc; |
2071 | } | |
2072 | ||
e940b5c2 TY |
2073 | static int em_cmpxchg(struct x86_emulate_ctxt *ctxt) |
2074 | { | |
2075 | /* Save real source value, then compare EAX against destination. */ | |
2076 | ctxt->src.orig_val = ctxt->src.val; | |
dd856efa | 2077 | ctxt->src.val = reg_read(ctxt, VCPU_REGS_RAX); |
e940b5c2 TY |
2078 | emulate_2op_SrcV(ctxt, "cmp"); |
2079 | ||
2080 | if (ctxt->eflags & EFLG_ZF) { | |
2081 | /* Success: write back to memory. */ | |
2082 | ctxt->dst.val = ctxt->src.orig_val; | |
2083 | } else { | |
2084 | /* Failure: write the value we saw to EAX. */ | |
2085 | ctxt->dst.type = OP_REG; | |
dd856efa | 2086 | ctxt->dst.addr.reg = reg_rmw(ctxt, VCPU_REGS_RAX); |
e940b5c2 TY |
2087 | } |
2088 | return X86EMUL_CONTINUE; | |
2089 | } | |
2090 | ||
d4b4325f | 2091 | static int em_lseg(struct x86_emulate_ctxt *ctxt) |
09b5f4d3 | 2092 | { |
d4b4325f | 2093 | int seg = ctxt->src2.val; |
09b5f4d3 WY |
2094 | unsigned short sel; |
2095 | int rc; | |
2096 | ||
9dac77fa | 2097 | memcpy(&sel, ctxt->src.valptr + ctxt->op_bytes, 2); |
09b5f4d3 | 2098 | |
7b105ca2 | 2099 | rc = load_segment_descriptor(ctxt, sel, seg); |
09b5f4d3 WY |
2100 | if (rc != X86EMUL_CONTINUE) |
2101 | return rc; | |
2102 | ||
9dac77fa | 2103 | ctxt->dst.val = ctxt->src.val; |
09b5f4d3 WY |
2104 | return rc; |
2105 | } | |
2106 | ||
7b105ca2 | 2107 | static void |
e66bb2cc | 2108 | setup_syscalls_segments(struct x86_emulate_ctxt *ctxt, |
7b105ca2 | 2109 | struct desc_struct *cs, struct desc_struct *ss) |
e66bb2cc | 2110 | { |
e66bb2cc | 2111 | cs->l = 0; /* will be adjusted later */ |
79168fd1 | 2112 | set_desc_base(cs, 0); /* flat segment */ |
e66bb2cc | 2113 | cs->g = 1; /* 4kb granularity */ |
79168fd1 | 2114 | set_desc_limit(cs, 0xfffff); /* 4GB limit */ |
e66bb2cc AP |
2115 | cs->type = 0x0b; /* Read, Execute, Accessed */ |
2116 | cs->s = 1; | |
2117 | cs->dpl = 0; /* will be adjusted later */ | |
79168fd1 GN |
2118 | cs->p = 1; |
2119 | cs->d = 1; | |
99245b50 | 2120 | cs->avl = 0; |
e66bb2cc | 2121 | |
79168fd1 GN |
2122 | set_desc_base(ss, 0); /* flat segment */ |
2123 | set_desc_limit(ss, 0xfffff); /* 4GB limit */ | |
e66bb2cc AP |
2124 | ss->g = 1; /* 4kb granularity */ |
2125 | ss->s = 1; | |
2126 | ss->type = 0x03; /* Read/Write, Accessed */ | |
79168fd1 | 2127 | ss->d = 1; /* 32bit stack segment */ |
e66bb2cc | 2128 | ss->dpl = 0; |
79168fd1 | 2129 | ss->p = 1; |
99245b50 GN |
2130 | ss->l = 0; |
2131 | ss->avl = 0; | |
e66bb2cc AP |
2132 | } |
2133 | ||
1a18a69b AK |
2134 | static bool vendor_intel(struct x86_emulate_ctxt *ctxt) |
2135 | { | |
2136 | u32 eax, ebx, ecx, edx; | |
2137 | ||
2138 | eax = ecx = 0; | |
0017f93a AK |
2139 | ctxt->ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx); |
2140 | return ebx == X86EMUL_CPUID_VENDOR_GenuineIntel_ebx | |
1a18a69b AK |
2141 | && ecx == X86EMUL_CPUID_VENDOR_GenuineIntel_ecx |
2142 | && edx == X86EMUL_CPUID_VENDOR_GenuineIntel_edx; | |
2143 | } | |
2144 | ||
c2226fc9 SB |
2145 | static bool em_syscall_is_enabled(struct x86_emulate_ctxt *ctxt) |
2146 | { | |
0225fb50 | 2147 | const struct x86_emulate_ops *ops = ctxt->ops; |
c2226fc9 SB |
2148 | u32 eax, ebx, ecx, edx; |
2149 | ||
2150 | /* | |
2151 | * syscall should always be enabled in longmode - so only become | |
2152 | * vendor specific (cpuid) if other modes are active... | |
2153 | */ | |
2154 | if (ctxt->mode == X86EMUL_MODE_PROT64) | |
2155 | return true; | |
2156 | ||
2157 | eax = 0x00000000; | |
2158 | ecx = 0x00000000; | |
0017f93a AK |
2159 | ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx); |
2160 | /* | |
2161 | * Intel ("GenuineIntel") | |
2162 | * remark: Intel CPUs only support "syscall" in 64bit | |
2163 | * longmode. Also an 64bit guest with a | |
2164 | * 32bit compat-app running will #UD !! While this | |
2165 | * behaviour can be fixed (by emulating) into AMD | |
2166 | * response - CPUs of AMD can't behave like Intel. | |
2167 | */ | |
2168 | if (ebx == X86EMUL_CPUID_VENDOR_GenuineIntel_ebx && | |
2169 | ecx == X86EMUL_CPUID_VENDOR_GenuineIntel_ecx && | |
2170 | edx == X86EMUL_CPUID_VENDOR_GenuineIntel_edx) | |
2171 | return false; | |
2172 | ||
2173 | /* AMD ("AuthenticAMD") */ | |
2174 | if (ebx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ebx && | |
2175 | ecx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ecx && | |
2176 | edx == X86EMUL_CPUID_VENDOR_AuthenticAMD_edx) | |
2177 | return true; | |
2178 | ||
2179 | /* AMD ("AMDisbetter!") */ | |
2180 | if (ebx == X86EMUL_CPUID_VENDOR_AMDisbetterI_ebx && | |
2181 | ecx == X86EMUL_CPUID_VENDOR_AMDisbetterI_ecx && | |
2182 | edx == X86EMUL_CPUID_VENDOR_AMDisbetterI_edx) | |
2183 | return true; | |
c2226fc9 SB |
2184 | |
2185 | /* default: (not Intel, not AMD), apply Intel's stricter rules... */ | |
2186 | return false; | |
2187 | } | |
2188 | ||
e01991e7 | 2189 | static int em_syscall(struct x86_emulate_ctxt *ctxt) |
e66bb2cc | 2190 | { |
0225fb50 | 2191 | const struct x86_emulate_ops *ops = ctxt->ops; |
79168fd1 | 2192 | struct desc_struct cs, ss; |
e66bb2cc | 2193 | u64 msr_data; |
79168fd1 | 2194 | u16 cs_sel, ss_sel; |
c2ad2bb3 | 2195 | u64 efer = 0; |
e66bb2cc AP |
2196 | |
2197 | /* syscall is not available in real mode */ | |
2e901c4c | 2198 | if (ctxt->mode == X86EMUL_MODE_REAL || |
35d3d4a1 AK |
2199 | ctxt->mode == X86EMUL_MODE_VM86) |
2200 | return emulate_ud(ctxt); | |
e66bb2cc | 2201 | |
c2226fc9 SB |
2202 | if (!(em_syscall_is_enabled(ctxt))) |
2203 | return emulate_ud(ctxt); | |
2204 | ||
c2ad2bb3 | 2205 | ops->get_msr(ctxt, MSR_EFER, &efer); |
7b105ca2 | 2206 | setup_syscalls_segments(ctxt, &cs, &ss); |
e66bb2cc | 2207 | |
c2226fc9 SB |
2208 | if (!(efer & EFER_SCE)) |
2209 | return emulate_ud(ctxt); | |
2210 | ||
717746e3 | 2211 | ops->get_msr(ctxt, MSR_STAR, &msr_data); |
e66bb2cc | 2212 | msr_data >>= 32; |
79168fd1 GN |
2213 | cs_sel = (u16)(msr_data & 0xfffc); |
2214 | ss_sel = (u16)(msr_data + 8); | |
e66bb2cc | 2215 | |
c2ad2bb3 | 2216 | if (efer & EFER_LMA) { |
79168fd1 | 2217 | cs.d = 0; |
e66bb2cc AP |
2218 | cs.l = 1; |
2219 | } | |
1aa36616 AK |
2220 | ops->set_segment(ctxt, cs_sel, &cs, 0, VCPU_SREG_CS); |
2221 | ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS); | |
e66bb2cc | 2222 | |
dd856efa | 2223 | *reg_write(ctxt, VCPU_REGS_RCX) = ctxt->_eip; |
c2ad2bb3 | 2224 | if (efer & EFER_LMA) { |
e66bb2cc | 2225 | #ifdef CONFIG_X86_64 |
dd856efa | 2226 | *reg_write(ctxt, VCPU_REGS_R11) = ctxt->eflags & ~EFLG_RF; |
e66bb2cc | 2227 | |
717746e3 | 2228 | ops->get_msr(ctxt, |
3fb1b5db GN |
2229 | ctxt->mode == X86EMUL_MODE_PROT64 ? |
2230 | MSR_LSTAR : MSR_CSTAR, &msr_data); | |
9dac77fa | 2231 | ctxt->_eip = msr_data; |
e66bb2cc | 2232 | |
717746e3 | 2233 | ops->get_msr(ctxt, MSR_SYSCALL_MASK, &msr_data); |
e66bb2cc AP |
2234 | ctxt->eflags &= ~(msr_data | EFLG_RF); |
2235 | #endif | |
2236 | } else { | |
2237 | /* legacy mode */ | |
717746e3 | 2238 | ops->get_msr(ctxt, MSR_STAR, &msr_data); |
9dac77fa | 2239 | ctxt->_eip = (u32)msr_data; |
e66bb2cc AP |
2240 | |
2241 | ctxt->eflags &= ~(EFLG_VM | EFLG_IF | EFLG_RF); | |
2242 | } | |
2243 | ||
e54cfa97 | 2244 | return X86EMUL_CONTINUE; |
e66bb2cc AP |
2245 | } |
2246 | ||
e01991e7 | 2247 | static int em_sysenter(struct x86_emulate_ctxt *ctxt) |
8c604352 | 2248 | { |
0225fb50 | 2249 | const struct x86_emulate_ops *ops = ctxt->ops; |
79168fd1 | 2250 | struct desc_struct cs, ss; |
8c604352 | 2251 | u64 msr_data; |
79168fd1 | 2252 | u16 cs_sel, ss_sel; |
c2ad2bb3 | 2253 | u64 efer = 0; |
8c604352 | 2254 | |
7b105ca2 | 2255 | ops->get_msr(ctxt, MSR_EFER, &efer); |
a0044755 | 2256 | /* inject #GP if in real mode */ |
35d3d4a1 AK |
2257 | if (ctxt->mode == X86EMUL_MODE_REAL) |
2258 | return emulate_gp(ctxt, 0); | |
8c604352 | 2259 | |
1a18a69b AK |
2260 | /* |
2261 | * Not recognized on AMD in compat mode (but is recognized in legacy | |
2262 | * mode). | |
2263 | */ | |
2264 | if ((ctxt->mode == X86EMUL_MODE_PROT32) && (efer & EFER_LMA) | |
2265 | && !vendor_intel(ctxt)) | |
2266 | return emulate_ud(ctxt); | |
2267 | ||
8c604352 AP |
2268 | /* XXX sysenter/sysexit have not been tested in 64bit mode. |
2269 | * Therefore, we inject an #UD. | |
2270 | */ | |
35d3d4a1 AK |
2271 | if (ctxt->mode == X86EMUL_MODE_PROT64) |
2272 | return emulate_ud(ctxt); | |
8c604352 | 2273 | |
7b105ca2 | 2274 | setup_syscalls_segments(ctxt, &cs, &ss); |
8c604352 | 2275 | |
717746e3 | 2276 | ops->get_msr(ctxt, MSR_IA32_SYSENTER_CS, &msr_data); |
8c604352 AP |
2277 | switch (ctxt->mode) { |
2278 | case X86EMUL_MODE_PROT32: | |
35d3d4a1 AK |
2279 | if ((msr_data & 0xfffc) == 0x0) |
2280 | return emulate_gp(ctxt, 0); | |
8c604352 AP |
2281 | break; |
2282 | case X86EMUL_MODE_PROT64: | |
35d3d4a1 AK |
2283 | if (msr_data == 0x0) |
2284 | return emulate_gp(ctxt, 0); | |
8c604352 | 2285 | break; |
9d1b39a9 GN |
2286 | default: |
2287 | break; | |
8c604352 AP |
2288 | } |
2289 | ||
2290 | ctxt->eflags &= ~(EFLG_VM | EFLG_IF | EFLG_RF); | |
79168fd1 GN |
2291 | cs_sel = (u16)msr_data; |
2292 | cs_sel &= ~SELECTOR_RPL_MASK; | |
2293 | ss_sel = cs_sel + 8; | |
2294 | ss_sel &= ~SELECTOR_RPL_MASK; | |
c2ad2bb3 | 2295 | if (ctxt->mode == X86EMUL_MODE_PROT64 || (efer & EFER_LMA)) { |
79168fd1 | 2296 | cs.d = 0; |
8c604352 AP |
2297 | cs.l = 1; |
2298 | } | |
2299 | ||
1aa36616 AK |
2300 | ops->set_segment(ctxt, cs_sel, &cs, 0, VCPU_SREG_CS); |
2301 | ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS); | |
8c604352 | 2302 | |
717746e3 | 2303 | ops->get_msr(ctxt, MSR_IA32_SYSENTER_EIP, &msr_data); |
9dac77fa | 2304 | ctxt->_eip = msr_data; |
8c604352 | 2305 | |
717746e3 | 2306 | ops->get_msr(ctxt, MSR_IA32_SYSENTER_ESP, &msr_data); |
dd856efa | 2307 | *reg_write(ctxt, VCPU_REGS_RSP) = msr_data; |
8c604352 | 2308 | |
e54cfa97 | 2309 | return X86EMUL_CONTINUE; |
8c604352 AP |
2310 | } |
2311 | ||
e01991e7 | 2312 | static int em_sysexit(struct x86_emulate_ctxt *ctxt) |
4668f050 | 2313 | { |
0225fb50 | 2314 | const struct x86_emulate_ops *ops = ctxt->ops; |
79168fd1 | 2315 | struct desc_struct cs, ss; |
4668f050 AP |
2316 | u64 msr_data; |
2317 | int usermode; | |
1249b96e | 2318 | u16 cs_sel = 0, ss_sel = 0; |
4668f050 | 2319 | |
a0044755 GN |
2320 | /* inject #GP if in real mode or Virtual 8086 mode */ |
2321 | if (ctxt->mode == X86EMUL_MODE_REAL || | |
35d3d4a1 AK |
2322 | ctxt->mode == X86EMUL_MODE_VM86) |
2323 | return emulate_gp(ctxt, 0); | |
4668f050 | 2324 | |
7b105ca2 | 2325 | setup_syscalls_segments(ctxt, &cs, &ss); |
4668f050 | 2326 | |
9dac77fa | 2327 | if ((ctxt->rex_prefix & 0x8) != 0x0) |
4668f050 AP |
2328 | usermode = X86EMUL_MODE_PROT64; |
2329 | else | |
2330 | usermode = X86EMUL_MODE_PROT32; | |
2331 | ||
2332 | cs.dpl = 3; | |
2333 | ss.dpl = 3; | |
717746e3 | 2334 | ops->get_msr(ctxt, MSR_IA32_SYSENTER_CS, &msr_data); |
4668f050 AP |
2335 | switch (usermode) { |
2336 | case X86EMUL_MODE_PROT32: | |
79168fd1 | 2337 | cs_sel = (u16)(msr_data + 16); |
35d3d4a1 AK |
2338 | if ((msr_data & 0xfffc) == 0x0) |
2339 | return emulate_gp(ctxt, 0); | |
79168fd1 | 2340 | ss_sel = (u16)(msr_data + 24); |
4668f050 AP |
2341 | break; |
2342 | case X86EMUL_MODE_PROT64: | |
79168fd1 | 2343 | cs_sel = (u16)(msr_data + 32); |
35d3d4a1 AK |
2344 | if (msr_data == 0x0) |
2345 | return emulate_gp(ctxt, 0); | |
79168fd1 GN |
2346 | ss_sel = cs_sel + 8; |
2347 | cs.d = 0; | |
4668f050 AP |
2348 | cs.l = 1; |
2349 | break; | |
2350 | } | |
79168fd1 GN |
2351 | cs_sel |= SELECTOR_RPL_MASK; |
2352 | ss_sel |= SELECTOR_RPL_MASK; | |
4668f050 | 2353 | |
1aa36616 AK |
2354 | ops->set_segment(ctxt, cs_sel, &cs, 0, VCPU_SREG_CS); |
2355 | ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS); | |
4668f050 | 2356 | |
dd856efa AK |
2357 | ctxt->_eip = reg_read(ctxt, VCPU_REGS_RDX); |
2358 | *reg_write(ctxt, VCPU_REGS_RSP) = reg_read(ctxt, VCPU_REGS_RCX); | |
4668f050 | 2359 | |
e54cfa97 | 2360 | return X86EMUL_CONTINUE; |
4668f050 AP |
2361 | } |
2362 | ||
7b105ca2 | 2363 | static bool emulator_bad_iopl(struct x86_emulate_ctxt *ctxt) |
f850e2e6 GN |
2364 | { |
2365 | int iopl; | |
2366 | if (ctxt->mode == X86EMUL_MODE_REAL) | |
2367 | return false; | |
2368 | if (ctxt->mode == X86EMUL_MODE_VM86) | |
2369 | return true; | |
2370 | iopl = (ctxt->eflags & X86_EFLAGS_IOPL) >> IOPL_SHIFT; | |
7b105ca2 | 2371 | return ctxt->ops->cpl(ctxt) > iopl; |
f850e2e6 GN |
2372 | } |
2373 | ||
2374 | static bool emulator_io_port_access_allowed(struct x86_emulate_ctxt *ctxt, | |
f850e2e6 GN |
2375 | u16 port, u16 len) |
2376 | { | |
0225fb50 | 2377 | const struct x86_emulate_ops *ops = ctxt->ops; |
79168fd1 | 2378 | struct desc_struct tr_seg; |
5601d05b | 2379 | u32 base3; |
f850e2e6 | 2380 | int r; |
1aa36616 | 2381 | u16 tr, io_bitmap_ptr, perm, bit_idx = port & 0x7; |
f850e2e6 | 2382 | unsigned mask = (1 << len) - 1; |
5601d05b | 2383 | unsigned long base; |
f850e2e6 | 2384 | |
1aa36616 | 2385 | ops->get_segment(ctxt, &tr, &tr_seg, &base3, VCPU_SREG_TR); |
79168fd1 | 2386 | if (!tr_seg.p) |
f850e2e6 | 2387 | return false; |
79168fd1 | 2388 | if (desc_limit_scaled(&tr_seg) < 103) |
f850e2e6 | 2389 | return false; |
5601d05b GN |
2390 | base = get_desc_base(&tr_seg); |
2391 | #ifdef CONFIG_X86_64 | |
2392 | base |= ((u64)base3) << 32; | |
2393 | #endif | |
0f65dd70 | 2394 | r = ops->read_std(ctxt, base + 102, &io_bitmap_ptr, 2, NULL); |
f850e2e6 GN |
2395 | if (r != X86EMUL_CONTINUE) |
2396 | return false; | |
79168fd1 | 2397 | if (io_bitmap_ptr + port/8 > desc_limit_scaled(&tr_seg)) |
f850e2e6 | 2398 | return false; |
0f65dd70 | 2399 | r = ops->read_std(ctxt, base + io_bitmap_ptr + port/8, &perm, 2, NULL); |
f850e2e6 GN |
2400 | if (r != X86EMUL_CONTINUE) |
2401 | return false; | |
2402 | if ((perm >> bit_idx) & mask) | |
2403 | return false; | |
2404 | return true; | |
2405 | } | |
2406 | ||
2407 | static bool emulator_io_permited(struct x86_emulate_ctxt *ctxt, | |
f850e2e6 GN |
2408 | u16 port, u16 len) |
2409 | { | |
4fc40f07 GN |
2410 | if (ctxt->perm_ok) |
2411 | return true; | |
2412 | ||
7b105ca2 TY |
2413 | if (emulator_bad_iopl(ctxt)) |
2414 | if (!emulator_io_port_access_allowed(ctxt, port, len)) | |
f850e2e6 | 2415 | return false; |
4fc40f07 GN |
2416 | |
2417 | ctxt->perm_ok = true; | |
2418 | ||
f850e2e6 GN |
2419 | return true; |
2420 | } | |
2421 | ||
38ba30ba | 2422 | static void save_state_to_tss16(struct x86_emulate_ctxt *ctxt, |
38ba30ba GN |
2423 | struct tss_segment_16 *tss) |
2424 | { | |
9dac77fa | 2425 | tss->ip = ctxt->_eip; |
38ba30ba | 2426 | tss->flag = ctxt->eflags; |
dd856efa AK |
2427 | tss->ax = reg_read(ctxt, VCPU_REGS_RAX); |
2428 | tss->cx = reg_read(ctxt, VCPU_REGS_RCX); | |
2429 | tss->dx = reg_read(ctxt, VCPU_REGS_RDX); | |
2430 | tss->bx = reg_read(ctxt, VCPU_REGS_RBX); | |
2431 | tss->sp = reg_read(ctxt, VCPU_REGS_RSP); | |
2432 | tss->bp = reg_read(ctxt, VCPU_REGS_RBP); | |
2433 | tss->si = reg_read(ctxt, VCPU_REGS_RSI); | |
2434 | tss->di = reg_read(ctxt, VCPU_REGS_RDI); | |
38ba30ba | 2435 | |
1aa36616 AK |
2436 | tss->es = get_segment_selector(ctxt, VCPU_SREG_ES); |
2437 | tss->cs = get_segment_selector(ctxt, VCPU_SREG_CS); | |
2438 | tss->ss = get_segment_selector(ctxt, VCPU_SREG_SS); | |
2439 | tss->ds = get_segment_selector(ctxt, VCPU_SREG_DS); | |
2440 | tss->ldt = get_segment_selector(ctxt, VCPU_SREG_LDTR); | |
38ba30ba GN |
2441 | } |
2442 | ||
2443 | static int load_state_from_tss16(struct x86_emulate_ctxt *ctxt, | |
38ba30ba GN |
2444 | struct tss_segment_16 *tss) |
2445 | { | |
38ba30ba GN |
2446 | int ret; |
2447 | ||
9dac77fa | 2448 | ctxt->_eip = tss->ip; |
38ba30ba | 2449 | ctxt->eflags = tss->flag | 2; |
dd856efa AK |
2450 | *reg_write(ctxt, VCPU_REGS_RAX) = tss->ax; |
2451 | *reg_write(ctxt, VCPU_REGS_RCX) = tss->cx; | |
2452 | *reg_write(ctxt, VCPU_REGS_RDX) = tss->dx; | |
2453 | *reg_write(ctxt, VCPU_REGS_RBX) = tss->bx; | |
2454 | *reg_write(ctxt, VCPU_REGS_RSP) = tss->sp; | |
2455 | *reg_write(ctxt, VCPU_REGS_RBP) = tss->bp; | |
2456 | *reg_write(ctxt, VCPU_REGS_RSI) = tss->si; | |
2457 | *reg_write(ctxt, VCPU_REGS_RDI) = tss->di; | |
38ba30ba GN |
2458 | |
2459 | /* | |
2460 | * SDM says that segment selectors are loaded before segment | |
2461 | * descriptors | |
2462 | */ | |
1aa36616 AK |
2463 | set_segment_selector(ctxt, tss->ldt, VCPU_SREG_LDTR); |
2464 | set_segment_selector(ctxt, tss->es, VCPU_SREG_ES); | |
2465 | set_segment_selector(ctxt, tss->cs, VCPU_SREG_CS); | |
2466 | set_segment_selector(ctxt, tss->ss, VCPU_SREG_SS); | |
2467 | set_segment_selector(ctxt, tss->ds, VCPU_SREG_DS); | |
38ba30ba GN |
2468 | |
2469 | /* | |
fc058680 | 2470 | * Now load segment descriptors. If fault happens at this stage |
38ba30ba GN |
2471 | * it is handled in a context of new task |
2472 | */ | |
7b105ca2 | 2473 | ret = load_segment_descriptor(ctxt, tss->ldt, VCPU_SREG_LDTR); |
38ba30ba GN |
2474 | if (ret != X86EMUL_CONTINUE) |
2475 | return ret; | |
7b105ca2 | 2476 | ret = load_segment_descriptor(ctxt, tss->es, VCPU_SREG_ES); |
38ba30ba GN |
2477 | if (ret != X86EMUL_CONTINUE) |
2478 | return ret; | |
7b105ca2 | 2479 | ret = load_segment_descriptor(ctxt, tss->cs, VCPU_SREG_CS); |
38ba30ba GN |
2480 | if (ret != X86EMUL_CONTINUE) |
2481 | return ret; | |
7b105ca2 | 2482 | ret = load_segment_descriptor(ctxt, tss->ss, VCPU_SREG_SS); |
38ba30ba GN |
2483 | if (ret != X86EMUL_CONTINUE) |
2484 | return ret; | |
7b105ca2 | 2485 | ret = load_segment_descriptor(ctxt, tss->ds, VCPU_SREG_DS); |
38ba30ba GN |
2486 | if (ret != X86EMUL_CONTINUE) |
2487 | return ret; | |
2488 | ||
2489 | return X86EMUL_CONTINUE; | |
2490 | } | |
2491 | ||
2492 | static int task_switch_16(struct x86_emulate_ctxt *ctxt, | |
38ba30ba GN |
2493 | u16 tss_selector, u16 old_tss_sel, |
2494 | ulong old_tss_base, struct desc_struct *new_desc) | |
2495 | { | |
0225fb50 | 2496 | const struct x86_emulate_ops *ops = ctxt->ops; |
38ba30ba GN |
2497 | struct tss_segment_16 tss_seg; |
2498 | int ret; | |
bcc55cba | 2499 | u32 new_tss_base = get_desc_base(new_desc); |
38ba30ba | 2500 | |
0f65dd70 | 2501 | ret = ops->read_std(ctxt, old_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 | 2506 | |
7b105ca2 | 2507 | save_state_to_tss16(ctxt, &tss_seg); |
38ba30ba | 2508 | |
0f65dd70 | 2509 | ret = ops->write_std(ctxt, old_tss_base, &tss_seg, sizeof tss_seg, |
bcc55cba | 2510 | &ctxt->exception); |
db297e3d | 2511 | if (ret != X86EMUL_CONTINUE) |
38ba30ba | 2512 | /* FIXME: need to provide precise fault address */ |
38ba30ba | 2513 | return ret; |
38ba30ba | 2514 | |
0f65dd70 | 2515 | ret = ops->read_std(ctxt, new_tss_base, &tss_seg, sizeof tss_seg, |
bcc55cba | 2516 | &ctxt->exception); |
db297e3d | 2517 | if (ret != X86EMUL_CONTINUE) |
38ba30ba | 2518 | /* FIXME: need to provide precise fault address */ |
38ba30ba | 2519 | return ret; |
38ba30ba GN |
2520 | |
2521 | if (old_tss_sel != 0xffff) { | |
2522 | tss_seg.prev_task_link = old_tss_sel; | |
2523 | ||
0f65dd70 | 2524 | ret = ops->write_std(ctxt, new_tss_base, |
38ba30ba GN |
2525 | &tss_seg.prev_task_link, |
2526 | sizeof tss_seg.prev_task_link, | |
0f65dd70 | 2527 | &ctxt->exception); |
db297e3d | 2528 | if (ret != X86EMUL_CONTINUE) |
38ba30ba | 2529 | /* FIXME: need to provide precise fault address */ |
38ba30ba | 2530 | return ret; |
38ba30ba GN |
2531 | } |
2532 | ||
7b105ca2 | 2533 | return load_state_from_tss16(ctxt, &tss_seg); |
38ba30ba GN |
2534 | } |
2535 | ||
2536 | static void save_state_to_tss32(struct x86_emulate_ctxt *ctxt, | |
38ba30ba GN |
2537 | struct tss_segment_32 *tss) |
2538 | { | |
7b105ca2 | 2539 | tss->cr3 = ctxt->ops->get_cr(ctxt, 3); |
9dac77fa | 2540 | tss->eip = ctxt->_eip; |
38ba30ba | 2541 | tss->eflags = ctxt->eflags; |
dd856efa AK |
2542 | tss->eax = reg_read(ctxt, VCPU_REGS_RAX); |
2543 | tss->ecx = reg_read(ctxt, VCPU_REGS_RCX); | |
2544 | tss->edx = reg_read(ctxt, VCPU_REGS_RDX); | |
2545 | tss->ebx = reg_read(ctxt, VCPU_REGS_RBX); | |
2546 | tss->esp = reg_read(ctxt, VCPU_REGS_RSP); | |
2547 | tss->ebp = reg_read(ctxt, VCPU_REGS_RBP); | |
2548 | tss->esi = reg_read(ctxt, VCPU_REGS_RSI); | |
2549 | tss->edi = reg_read(ctxt, VCPU_REGS_RDI); | |
38ba30ba | 2550 | |
1aa36616 AK |
2551 | tss->es = get_segment_selector(ctxt, VCPU_SREG_ES); |
2552 | tss->cs = get_segment_selector(ctxt, VCPU_SREG_CS); | |
2553 | tss->ss = get_segment_selector(ctxt, VCPU_SREG_SS); | |
2554 | tss->ds = get_segment_selector(ctxt, VCPU_SREG_DS); | |
2555 | tss->fs = get_segment_selector(ctxt, VCPU_SREG_FS); | |
2556 | tss->gs = get_segment_selector(ctxt, VCPU_SREG_GS); | |
2557 | tss->ldt_selector = get_segment_selector(ctxt, VCPU_SREG_LDTR); | |
38ba30ba GN |
2558 | } |
2559 | ||
2560 | static int load_state_from_tss32(struct x86_emulate_ctxt *ctxt, | |
38ba30ba GN |
2561 | struct tss_segment_32 *tss) |
2562 | { | |
38ba30ba GN |
2563 | int ret; |
2564 | ||
7b105ca2 | 2565 | if (ctxt->ops->set_cr(ctxt, 3, tss->cr3)) |
35d3d4a1 | 2566 | return emulate_gp(ctxt, 0); |
9dac77fa | 2567 | ctxt->_eip = tss->eip; |
38ba30ba | 2568 | ctxt->eflags = tss->eflags | 2; |
4cee4798 KW |
2569 | |
2570 | /* General purpose registers */ | |
dd856efa AK |
2571 | *reg_write(ctxt, VCPU_REGS_RAX) = tss->eax; |
2572 | *reg_write(ctxt, VCPU_REGS_RCX) = tss->ecx; | |
2573 | *reg_write(ctxt, VCPU_REGS_RDX) = tss->edx; | |
2574 | *reg_write(ctxt, VCPU_REGS_RBX) = tss->ebx; | |
2575 | *reg_write(ctxt, VCPU_REGS_RSP) = tss->esp; | |
2576 | *reg_write(ctxt, VCPU_REGS_RBP) = tss->ebp; | |
2577 | *reg_write(ctxt, VCPU_REGS_RSI) = tss->esi; | |
2578 | *reg_write(ctxt, VCPU_REGS_RDI) = tss->edi; | |
38ba30ba GN |
2579 | |
2580 | /* | |
2581 | * SDM says that segment selectors are loaded before segment | |
2582 | * descriptors | |
2583 | */ | |
1aa36616 AK |
2584 | set_segment_selector(ctxt, tss->ldt_selector, VCPU_SREG_LDTR); |
2585 | set_segment_selector(ctxt, tss->es, VCPU_SREG_ES); | |
2586 | set_segment_selector(ctxt, tss->cs, VCPU_SREG_CS); | |
2587 | set_segment_selector(ctxt, tss->ss, VCPU_SREG_SS); | |
2588 | set_segment_selector(ctxt, tss->ds, VCPU_SREG_DS); | |
2589 | set_segment_selector(ctxt, tss->fs, VCPU_SREG_FS); | |
2590 | set_segment_selector(ctxt, tss->gs, VCPU_SREG_GS); | |
38ba30ba | 2591 | |
4cee4798 KW |
2592 | /* |
2593 | * If we're switching between Protected Mode and VM86, we need to make | |
2594 | * sure to update the mode before loading the segment descriptors so | |
2595 | * that the selectors are interpreted correctly. | |
2596 | * | |
2597 | * Need to get rflags to the vcpu struct immediately because it | |
2598 | * influences the CPL which is checked at least when loading the segment | |
2599 | * descriptors and when pushing an error code to the new kernel stack. | |
2600 | * | |
2601 | * TODO Introduce a separate ctxt->ops->set_cpl callback | |
2602 | */ | |
2603 | if (ctxt->eflags & X86_EFLAGS_VM) | |
2604 | ctxt->mode = X86EMUL_MODE_VM86; | |
2605 | else | |
2606 | ctxt->mode = X86EMUL_MODE_PROT32; | |
2607 | ||
2608 | ctxt->ops->set_rflags(ctxt, ctxt->eflags); | |
2609 | ||
38ba30ba GN |
2610 | /* |
2611 | * Now load segment descriptors. If fault happenes at this stage | |
2612 | * it is handled in a context of new task | |
2613 | */ | |
7b105ca2 | 2614 | ret = load_segment_descriptor(ctxt, tss->ldt_selector, VCPU_SREG_LDTR); |
38ba30ba GN |
2615 | if (ret != X86EMUL_CONTINUE) |
2616 | return ret; | |
7b105ca2 | 2617 | ret = load_segment_descriptor(ctxt, tss->es, VCPU_SREG_ES); |
38ba30ba GN |
2618 | if (ret != X86EMUL_CONTINUE) |
2619 | return ret; | |
7b105ca2 | 2620 | ret = load_segment_descriptor(ctxt, tss->cs, VCPU_SREG_CS); |
38ba30ba GN |
2621 | if (ret != X86EMUL_CONTINUE) |
2622 | return ret; | |
7b105ca2 | 2623 | ret = load_segment_descriptor(ctxt, tss->ss, VCPU_SREG_SS); |
38ba30ba GN |
2624 | if (ret != X86EMUL_CONTINUE) |
2625 | return ret; | |
7b105ca2 | 2626 | ret = load_segment_descriptor(ctxt, tss->ds, VCPU_SREG_DS); |
38ba30ba GN |
2627 | if (ret != X86EMUL_CONTINUE) |
2628 | return ret; | |
7b105ca2 | 2629 | ret = load_segment_descriptor(ctxt, tss->fs, VCPU_SREG_FS); |
38ba30ba GN |
2630 | if (ret != X86EMUL_CONTINUE) |
2631 | return ret; | |
7b105ca2 | 2632 | ret = load_segment_descriptor(ctxt, tss->gs, VCPU_SREG_GS); |
38ba30ba GN |
2633 | if (ret != X86EMUL_CONTINUE) |
2634 | return ret; | |
2635 | ||
2636 | return X86EMUL_CONTINUE; | |
2637 | } | |
2638 | ||
2639 | static int task_switch_32(struct x86_emulate_ctxt *ctxt, | |
38ba30ba GN |
2640 | u16 tss_selector, u16 old_tss_sel, |
2641 | ulong old_tss_base, struct desc_struct *new_desc) | |
2642 | { | |
0225fb50 | 2643 | const struct x86_emulate_ops *ops = ctxt->ops; |
38ba30ba GN |
2644 | struct tss_segment_32 tss_seg; |
2645 | int ret; | |
bcc55cba | 2646 | u32 new_tss_base = get_desc_base(new_desc); |
38ba30ba | 2647 | |
0f65dd70 | 2648 | ret = ops->read_std(ctxt, old_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 | 2653 | |
7b105ca2 | 2654 | save_state_to_tss32(ctxt, &tss_seg); |
38ba30ba | 2655 | |
0f65dd70 | 2656 | ret = ops->write_std(ctxt, old_tss_base, &tss_seg, sizeof tss_seg, |
bcc55cba | 2657 | &ctxt->exception); |
db297e3d | 2658 | if (ret != X86EMUL_CONTINUE) |
38ba30ba | 2659 | /* FIXME: need to provide precise fault address */ |
38ba30ba | 2660 | return ret; |
38ba30ba | 2661 | |
0f65dd70 | 2662 | ret = ops->read_std(ctxt, new_tss_base, &tss_seg, sizeof tss_seg, |
bcc55cba | 2663 | &ctxt->exception); |
db297e3d | 2664 | if (ret != X86EMUL_CONTINUE) |
38ba30ba | 2665 | /* FIXME: need to provide precise fault address */ |
38ba30ba | 2666 | return ret; |
38ba30ba GN |
2667 | |
2668 | if (old_tss_sel != 0xffff) { | |
2669 | tss_seg.prev_task_link = old_tss_sel; | |
2670 | ||
0f65dd70 | 2671 | ret = ops->write_std(ctxt, new_tss_base, |
38ba30ba GN |
2672 | &tss_seg.prev_task_link, |
2673 | sizeof tss_seg.prev_task_link, | |
0f65dd70 | 2674 | &ctxt->exception); |
db297e3d | 2675 | if (ret != X86EMUL_CONTINUE) |
38ba30ba | 2676 | /* FIXME: need to provide precise fault address */ |
38ba30ba | 2677 | return ret; |
38ba30ba GN |
2678 | } |
2679 | ||
7b105ca2 | 2680 | return load_state_from_tss32(ctxt, &tss_seg); |
38ba30ba GN |
2681 | } |
2682 | ||
2683 | static int emulator_do_task_switch(struct x86_emulate_ctxt *ctxt, | |
7f3d35fd | 2684 | u16 tss_selector, int idt_index, int reason, |
e269fb21 | 2685 | bool has_error_code, u32 error_code) |
38ba30ba | 2686 | { |
0225fb50 | 2687 | const struct x86_emulate_ops *ops = ctxt->ops; |
38ba30ba GN |
2688 | struct desc_struct curr_tss_desc, next_tss_desc; |
2689 | int ret; | |
1aa36616 | 2690 | u16 old_tss_sel = get_segment_selector(ctxt, VCPU_SREG_TR); |
38ba30ba | 2691 | ulong old_tss_base = |
4bff1e86 | 2692 | ops->get_cached_segment_base(ctxt, VCPU_SREG_TR); |
ceffb459 | 2693 | u32 desc_limit; |
e919464b | 2694 | ulong desc_addr; |
38ba30ba GN |
2695 | |
2696 | /* FIXME: old_tss_base == ~0 ? */ | |
2697 | ||
e919464b | 2698 | ret = read_segment_descriptor(ctxt, tss_selector, &next_tss_desc, &desc_addr); |
38ba30ba GN |
2699 | if (ret != X86EMUL_CONTINUE) |
2700 | return ret; | |
e919464b | 2701 | ret = read_segment_descriptor(ctxt, old_tss_sel, &curr_tss_desc, &desc_addr); |
38ba30ba GN |
2702 | if (ret != X86EMUL_CONTINUE) |
2703 | return ret; | |
2704 | ||
2705 | /* FIXME: check that next_tss_desc is tss */ | |
2706 | ||
7f3d35fd KW |
2707 | /* |
2708 | * Check privileges. The three cases are task switch caused by... | |
2709 | * | |
2710 | * 1. jmp/call/int to task gate: Check against DPL of the task gate | |
2711 | * 2. Exception/IRQ/iret: No check is performed | |
fc058680 | 2712 | * 3. jmp/call to TSS: Check against DPL of the TSS |
7f3d35fd KW |
2713 | */ |
2714 | if (reason == TASK_SWITCH_GATE) { | |
2715 | if (idt_index != -1) { | |
2716 | /* Software interrupts */ | |
2717 | struct desc_struct task_gate_desc; | |
2718 | int dpl; | |
2719 | ||
2720 | ret = read_interrupt_descriptor(ctxt, idt_index, | |
2721 | &task_gate_desc); | |
2722 | if (ret != X86EMUL_CONTINUE) | |
2723 | return ret; | |
2724 | ||
2725 | dpl = task_gate_desc.dpl; | |
2726 | if ((tss_selector & 3) > dpl || ops->cpl(ctxt) > dpl) | |
2727 | return emulate_gp(ctxt, (idt_index << 3) | 0x2); | |
2728 | } | |
2729 | } else if (reason != TASK_SWITCH_IRET) { | |
2730 | int dpl = next_tss_desc.dpl; | |
2731 | if ((tss_selector & 3) > dpl || ops->cpl(ctxt) > dpl) | |
2732 | return emulate_gp(ctxt, tss_selector); | |
38ba30ba GN |
2733 | } |
2734 | ||
7f3d35fd | 2735 | |
ceffb459 GN |
2736 | desc_limit = desc_limit_scaled(&next_tss_desc); |
2737 | if (!next_tss_desc.p || | |
2738 | ((desc_limit < 0x67 && (next_tss_desc.type & 8)) || | |
2739 | desc_limit < 0x2b)) { | |
54b8486f | 2740 | emulate_ts(ctxt, tss_selector & 0xfffc); |
38ba30ba GN |
2741 | return X86EMUL_PROPAGATE_FAULT; |
2742 | } | |
2743 | ||
2744 | if (reason == TASK_SWITCH_IRET || reason == TASK_SWITCH_JMP) { | |
2745 | curr_tss_desc.type &= ~(1 << 1); /* clear busy flag */ | |
7b105ca2 | 2746 | write_segment_descriptor(ctxt, old_tss_sel, &curr_tss_desc); |
38ba30ba GN |
2747 | } |
2748 | ||
2749 | if (reason == TASK_SWITCH_IRET) | |
2750 | ctxt->eflags = ctxt->eflags & ~X86_EFLAGS_NT; | |
2751 | ||
2752 | /* set back link to prev task only if NT bit is set in eflags | |
fc058680 | 2753 | note that old_tss_sel is not used after this point */ |
38ba30ba GN |
2754 | if (reason != TASK_SWITCH_CALL && reason != TASK_SWITCH_GATE) |
2755 | old_tss_sel = 0xffff; | |
2756 | ||
2757 | if (next_tss_desc.type & 8) | |
7b105ca2 | 2758 | ret = task_switch_32(ctxt, tss_selector, old_tss_sel, |
38ba30ba GN |
2759 | old_tss_base, &next_tss_desc); |
2760 | else | |
7b105ca2 | 2761 | ret = task_switch_16(ctxt, tss_selector, old_tss_sel, |
38ba30ba | 2762 | old_tss_base, &next_tss_desc); |
0760d448 JK |
2763 | if (ret != X86EMUL_CONTINUE) |
2764 | return ret; | |
38ba30ba GN |
2765 | |
2766 | if (reason == TASK_SWITCH_CALL || reason == TASK_SWITCH_GATE) | |
2767 | ctxt->eflags = ctxt->eflags | X86_EFLAGS_NT; | |
2768 | ||
2769 | if (reason != TASK_SWITCH_IRET) { | |
2770 | next_tss_desc.type |= (1 << 1); /* set busy flag */ | |
7b105ca2 | 2771 | write_segment_descriptor(ctxt, tss_selector, &next_tss_desc); |
38ba30ba GN |
2772 | } |
2773 | ||
717746e3 | 2774 | ops->set_cr(ctxt, 0, ops->get_cr(ctxt, 0) | X86_CR0_TS); |
1aa36616 | 2775 | ops->set_segment(ctxt, tss_selector, &next_tss_desc, 0, VCPU_SREG_TR); |
38ba30ba | 2776 | |
e269fb21 | 2777 | if (has_error_code) { |
9dac77fa AK |
2778 | ctxt->op_bytes = ctxt->ad_bytes = (next_tss_desc.type & 8) ? 4 : 2; |
2779 | ctxt->lock_prefix = 0; | |
2780 | ctxt->src.val = (unsigned long) error_code; | |
4487b3b4 | 2781 | ret = em_push(ctxt); |
e269fb21 JK |
2782 | } |
2783 | ||
38ba30ba GN |
2784 | return ret; |
2785 | } | |
2786 | ||
2787 | int emulator_task_switch(struct x86_emulate_ctxt *ctxt, | |
7f3d35fd | 2788 | u16 tss_selector, int idt_index, int reason, |
e269fb21 | 2789 | bool has_error_code, u32 error_code) |
38ba30ba | 2790 | { |
38ba30ba GN |
2791 | int rc; |
2792 | ||
dd856efa | 2793 | invalidate_registers(ctxt); |
9dac77fa AK |
2794 | ctxt->_eip = ctxt->eip; |
2795 | ctxt->dst.type = OP_NONE; | |
38ba30ba | 2796 | |
7f3d35fd | 2797 | rc = emulator_do_task_switch(ctxt, tss_selector, idt_index, reason, |
e269fb21 | 2798 | has_error_code, error_code); |
38ba30ba | 2799 | |
dd856efa | 2800 | if (rc == X86EMUL_CONTINUE) { |
9dac77fa | 2801 | ctxt->eip = ctxt->_eip; |
dd856efa AK |
2802 | writeback_registers(ctxt); |
2803 | } | |
38ba30ba | 2804 | |
a0c0ab2f | 2805 | return (rc == X86EMUL_UNHANDLEABLE) ? EMULATION_FAILED : EMULATION_OK; |
38ba30ba GN |
2806 | } |
2807 | ||
f3bd64c6 GN |
2808 | static void string_addr_inc(struct x86_emulate_ctxt *ctxt, int reg, |
2809 | struct operand *op) | |
a682e354 | 2810 | { |
b3356bf0 | 2811 | int df = (ctxt->eflags & EFLG_DF) ? -op->count : op->count; |
a682e354 | 2812 | |
dd856efa AK |
2813 | register_address_increment(ctxt, reg_rmw(ctxt, reg), df * op->bytes); |
2814 | op->addr.mem.ea = register_address(ctxt, reg_read(ctxt, reg)); | |
a682e354 GN |
2815 | } |
2816 | ||
7af04fc0 AK |
2817 | static int em_das(struct x86_emulate_ctxt *ctxt) |
2818 | { | |
7af04fc0 AK |
2819 | u8 al, old_al; |
2820 | bool af, cf, old_cf; | |
2821 | ||
2822 | cf = ctxt->eflags & X86_EFLAGS_CF; | |
9dac77fa | 2823 | al = ctxt->dst.val; |
7af04fc0 AK |
2824 | |
2825 | old_al = al; | |
2826 | old_cf = cf; | |
2827 | cf = false; | |
2828 | af = ctxt->eflags & X86_EFLAGS_AF; | |
2829 | if ((al & 0x0f) > 9 || af) { | |
2830 | al -= 6; | |
2831 | cf = old_cf | (al >= 250); | |
2832 | af = true; | |
2833 | } else { | |
2834 | af = false; | |
2835 | } | |
2836 | if (old_al > 0x99 || old_cf) { | |
2837 | al -= 0x60; | |
2838 | cf = true; | |
2839 | } | |
2840 | ||
9dac77fa | 2841 | ctxt->dst.val = al; |
7af04fc0 | 2842 | /* Set PF, ZF, SF */ |
9dac77fa AK |
2843 | ctxt->src.type = OP_IMM; |
2844 | ctxt->src.val = 0; | |
2845 | ctxt->src.bytes = 1; | |
a31b9cea | 2846 | emulate_2op_SrcV(ctxt, "or"); |
7af04fc0 AK |
2847 | ctxt->eflags &= ~(X86_EFLAGS_AF | X86_EFLAGS_CF); |
2848 | if (cf) | |
2849 | ctxt->eflags |= X86_EFLAGS_CF; | |
2850 | if (af) | |
2851 | ctxt->eflags |= X86_EFLAGS_AF; | |
2852 | return X86EMUL_CONTINUE; | |
2853 | } | |
2854 | ||
7f662273 GN |
2855 | static int em_aad(struct x86_emulate_ctxt *ctxt) |
2856 | { | |
2857 | u8 al = ctxt->dst.val & 0xff; | |
2858 | u8 ah = (ctxt->dst.val >> 8) & 0xff; | |
2859 | ||
2860 | al = (al + (ah * ctxt->src.val)) & 0xff; | |
2861 | ||
2862 | ctxt->dst.val = (ctxt->dst.val & 0xffff0000) | al; | |
2863 | ||
2864 | ctxt->eflags &= ~(X86_EFLAGS_PF | X86_EFLAGS_SF | X86_EFLAGS_ZF); | |
2865 | ||
2866 | if (!al) | |
2867 | ctxt->eflags |= X86_EFLAGS_ZF; | |
2868 | if (!(al & 1)) | |
2869 | ctxt->eflags |= X86_EFLAGS_PF; | |
2870 | if (al & 0x80) | |
2871 | ctxt->eflags |= X86_EFLAGS_SF; | |
2872 | ||
2873 | return X86EMUL_CONTINUE; | |
2874 | } | |
2875 | ||
d4ddafcd TY |
2876 | static int em_call(struct x86_emulate_ctxt *ctxt) |
2877 | { | |
2878 | long rel = ctxt->src.val; | |
2879 | ||
2880 | ctxt->src.val = (unsigned long)ctxt->_eip; | |
2881 | jmp_rel(ctxt, rel); | |
2882 | return em_push(ctxt); | |
2883 | } | |
2884 | ||
0ef753b8 AK |
2885 | static int em_call_far(struct x86_emulate_ctxt *ctxt) |
2886 | { | |
0ef753b8 AK |
2887 | u16 sel, old_cs; |
2888 | ulong old_eip; | |
2889 | int rc; | |
2890 | ||
1aa36616 | 2891 | old_cs = get_segment_selector(ctxt, VCPU_SREG_CS); |
9dac77fa | 2892 | old_eip = ctxt->_eip; |
0ef753b8 | 2893 | |
9dac77fa | 2894 | memcpy(&sel, ctxt->src.valptr + ctxt->op_bytes, 2); |
7b105ca2 | 2895 | if (load_segment_descriptor(ctxt, sel, VCPU_SREG_CS)) |
0ef753b8 AK |
2896 | return X86EMUL_CONTINUE; |
2897 | ||
9dac77fa AK |
2898 | ctxt->_eip = 0; |
2899 | memcpy(&ctxt->_eip, ctxt->src.valptr, ctxt->op_bytes); | |
0ef753b8 | 2900 | |
9dac77fa | 2901 | ctxt->src.val = old_cs; |
4487b3b4 | 2902 | rc = em_push(ctxt); |
0ef753b8 AK |
2903 | if (rc != X86EMUL_CONTINUE) |
2904 | return rc; | |
2905 | ||
9dac77fa | 2906 | ctxt->src.val = old_eip; |
4487b3b4 | 2907 | return em_push(ctxt); |
0ef753b8 AK |
2908 | } |
2909 | ||
40ece7c7 AK |
2910 | static int em_ret_near_imm(struct x86_emulate_ctxt *ctxt) |
2911 | { | |
40ece7c7 AK |
2912 | int rc; |
2913 | ||
9dac77fa AK |
2914 | ctxt->dst.type = OP_REG; |
2915 | ctxt->dst.addr.reg = &ctxt->_eip; | |
2916 | ctxt->dst.bytes = ctxt->op_bytes; | |
2917 | rc = emulate_pop(ctxt, &ctxt->dst.val, ctxt->op_bytes); | |
40ece7c7 AK |
2918 | if (rc != X86EMUL_CONTINUE) |
2919 | return rc; | |
5ad105e5 | 2920 | rsp_increment(ctxt, ctxt->src.val); |
40ece7c7 AK |
2921 | return X86EMUL_CONTINUE; |
2922 | } | |
2923 | ||
d67fc27a TY |
2924 | static int em_add(struct x86_emulate_ctxt *ctxt) |
2925 | { | |
a31b9cea | 2926 | emulate_2op_SrcV(ctxt, "add"); |
d67fc27a TY |
2927 | return X86EMUL_CONTINUE; |
2928 | } | |
2929 | ||
2930 | static int em_or(struct x86_emulate_ctxt *ctxt) | |
2931 | { | |
a31b9cea | 2932 | emulate_2op_SrcV(ctxt, "or"); |
d67fc27a TY |
2933 | return X86EMUL_CONTINUE; |
2934 | } | |
2935 | ||
2936 | static int em_adc(struct x86_emulate_ctxt *ctxt) | |
2937 | { | |
a31b9cea | 2938 | emulate_2op_SrcV(ctxt, "adc"); |
d67fc27a TY |
2939 | return X86EMUL_CONTINUE; |
2940 | } | |
2941 | ||
2942 | static int em_sbb(struct x86_emulate_ctxt *ctxt) | |
2943 | { | |
a31b9cea | 2944 | emulate_2op_SrcV(ctxt, "sbb"); |
d67fc27a TY |
2945 | return X86EMUL_CONTINUE; |
2946 | } | |
2947 | ||
2948 | static int em_and(struct x86_emulate_ctxt *ctxt) | |
2949 | { | |
a31b9cea | 2950 | emulate_2op_SrcV(ctxt, "and"); |
d67fc27a TY |
2951 | return X86EMUL_CONTINUE; |
2952 | } | |
2953 | ||
2954 | static int em_sub(struct x86_emulate_ctxt *ctxt) | |
2955 | { | |
a31b9cea | 2956 | emulate_2op_SrcV(ctxt, "sub"); |
d67fc27a TY |
2957 | return X86EMUL_CONTINUE; |
2958 | } | |
2959 | ||
2960 | static int em_xor(struct x86_emulate_ctxt *ctxt) | |
2961 | { | |
a31b9cea | 2962 | emulate_2op_SrcV(ctxt, "xor"); |
d67fc27a TY |
2963 | return X86EMUL_CONTINUE; |
2964 | } | |
2965 | ||
2966 | static int em_cmp(struct x86_emulate_ctxt *ctxt) | |
2967 | { | |
a31b9cea | 2968 | emulate_2op_SrcV(ctxt, "cmp"); |
d67fc27a | 2969 | /* Disable writeback. */ |
9dac77fa | 2970 | ctxt->dst.type = OP_NONE; |
d67fc27a TY |
2971 | return X86EMUL_CONTINUE; |
2972 | } | |
2973 | ||
9f21ca59 TY |
2974 | static int em_test(struct x86_emulate_ctxt *ctxt) |
2975 | { | |
a31b9cea | 2976 | emulate_2op_SrcV(ctxt, "test"); |
caa8a168 AK |
2977 | /* Disable writeback. */ |
2978 | ctxt->dst.type = OP_NONE; | |
9f21ca59 TY |
2979 | return X86EMUL_CONTINUE; |
2980 | } | |
2981 | ||
e4f973ae TY |
2982 | static int em_xchg(struct x86_emulate_ctxt *ctxt) |
2983 | { | |
e4f973ae | 2984 | /* Write back the register source. */ |
9dac77fa AK |
2985 | ctxt->src.val = ctxt->dst.val; |
2986 | write_register_operand(&ctxt->src); | |
e4f973ae TY |
2987 | |
2988 | /* Write back the memory destination with implicit LOCK prefix. */ | |
9dac77fa AK |
2989 | ctxt->dst.val = ctxt->src.orig_val; |
2990 | ctxt->lock_prefix = 1; | |
e4f973ae TY |
2991 | return X86EMUL_CONTINUE; |
2992 | } | |
2993 | ||
5c82aa29 | 2994 | static int em_imul(struct x86_emulate_ctxt *ctxt) |
f3a1b9f4 | 2995 | { |
a31b9cea | 2996 | emulate_2op_SrcV_nobyte(ctxt, "imul"); |
f3a1b9f4 AK |
2997 | return X86EMUL_CONTINUE; |
2998 | } | |
2999 | ||
5c82aa29 AK |
3000 | static int em_imul_3op(struct x86_emulate_ctxt *ctxt) |
3001 | { | |
9dac77fa | 3002 | ctxt->dst.val = ctxt->src2.val; |
5c82aa29 AK |
3003 | return em_imul(ctxt); |
3004 | } | |
3005 | ||
61429142 AK |
3006 | static int em_cwd(struct x86_emulate_ctxt *ctxt) |
3007 | { | |
9dac77fa AK |
3008 | ctxt->dst.type = OP_REG; |
3009 | ctxt->dst.bytes = ctxt->src.bytes; | |
dd856efa | 3010 | ctxt->dst.addr.reg = reg_rmw(ctxt, VCPU_REGS_RDX); |
9dac77fa | 3011 | ctxt->dst.val = ~((ctxt->src.val >> (ctxt->src.bytes * 8 - 1)) - 1); |
61429142 AK |
3012 | |
3013 | return X86EMUL_CONTINUE; | |
3014 | } | |
3015 | ||
48bb5d3c AK |
3016 | static int em_rdtsc(struct x86_emulate_ctxt *ctxt) |
3017 | { | |
48bb5d3c AK |
3018 | u64 tsc = 0; |
3019 | ||
717746e3 | 3020 | ctxt->ops->get_msr(ctxt, MSR_IA32_TSC, &tsc); |
dd856efa AK |
3021 | *reg_write(ctxt, VCPU_REGS_RAX) = (u32)tsc; |
3022 | *reg_write(ctxt, VCPU_REGS_RDX) = tsc >> 32; | |
48bb5d3c AK |
3023 | return X86EMUL_CONTINUE; |
3024 | } | |
3025 | ||
222d21aa AK |
3026 | static int em_rdpmc(struct x86_emulate_ctxt *ctxt) |
3027 | { | |
3028 | u64 pmc; | |
3029 | ||
dd856efa | 3030 | if (ctxt->ops->read_pmc(ctxt, reg_read(ctxt, VCPU_REGS_RCX), &pmc)) |
222d21aa | 3031 | return emulate_gp(ctxt, 0); |
dd856efa AK |
3032 | *reg_write(ctxt, VCPU_REGS_RAX) = (u32)pmc; |
3033 | *reg_write(ctxt, VCPU_REGS_RDX) = pmc >> 32; | |
222d21aa AK |
3034 | return X86EMUL_CONTINUE; |
3035 | } | |
3036 | ||
b9eac5f4 AK |
3037 | static int em_mov(struct x86_emulate_ctxt *ctxt) |
3038 | { | |
49597d81 | 3039 | memcpy(ctxt->dst.valptr, ctxt->src.valptr, ctxt->op_bytes); |
b9eac5f4 AK |
3040 | return X86EMUL_CONTINUE; |
3041 | } | |
3042 | ||
bc00f8d2 TY |
3043 | static int em_cr_write(struct x86_emulate_ctxt *ctxt) |
3044 | { | |
3045 | if (ctxt->ops->set_cr(ctxt, ctxt->modrm_reg, ctxt->src.val)) | |
3046 | return emulate_gp(ctxt, 0); | |
3047 | ||
3048 | /* Disable writeback. */ | |
3049 | ctxt->dst.type = OP_NONE; | |
3050 | return X86EMUL_CONTINUE; | |
3051 | } | |
3052 | ||
3053 | static int em_dr_write(struct x86_emulate_ctxt *ctxt) | |
3054 | { | |
3055 | unsigned long val; | |
3056 | ||
3057 | if (ctxt->mode == X86EMUL_MODE_PROT64) | |
3058 | val = ctxt->src.val & ~0ULL; | |
3059 | else | |
3060 | val = ctxt->src.val & ~0U; | |
3061 | ||
3062 | /* #UD condition is already handled. */ | |
3063 | if (ctxt->ops->set_dr(ctxt, ctxt->modrm_reg, val) < 0) | |
3064 | return emulate_gp(ctxt, 0); | |
3065 | ||
3066 | /* Disable writeback. */ | |
3067 | ctxt->dst.type = OP_NONE; | |
3068 | return X86EMUL_CONTINUE; | |
3069 | } | |
3070 | ||
e1e210b0 TY |
3071 | static int em_wrmsr(struct x86_emulate_ctxt *ctxt) |
3072 | { | |
3073 | u64 msr_data; | |
3074 | ||
dd856efa AK |
3075 | msr_data = (u32)reg_read(ctxt, VCPU_REGS_RAX) |
3076 | | ((u64)reg_read(ctxt, VCPU_REGS_RDX) << 32); | |
3077 | if (ctxt->ops->set_msr(ctxt, reg_read(ctxt, VCPU_REGS_RCX), msr_data)) | |
e1e210b0 TY |
3078 | return emulate_gp(ctxt, 0); |
3079 | ||
3080 | return X86EMUL_CONTINUE; | |
3081 | } | |
3082 | ||
3083 | static int em_rdmsr(struct x86_emulate_ctxt *ctxt) | |
3084 | { | |
3085 | u64 msr_data; | |
3086 | ||
dd856efa | 3087 | if (ctxt->ops->get_msr(ctxt, reg_read(ctxt, VCPU_REGS_RCX), &msr_data)) |
e1e210b0 TY |
3088 | return emulate_gp(ctxt, 0); |
3089 | ||
dd856efa AK |
3090 | *reg_write(ctxt, VCPU_REGS_RAX) = (u32)msr_data; |
3091 | *reg_write(ctxt, VCPU_REGS_RDX) = msr_data >> 32; | |
e1e210b0 TY |
3092 | return X86EMUL_CONTINUE; |
3093 | } | |
3094 | ||
1bd5f469 TY |
3095 | static int em_mov_rm_sreg(struct x86_emulate_ctxt *ctxt) |
3096 | { | |
9dac77fa | 3097 | if (ctxt->modrm_reg > VCPU_SREG_GS) |
1bd5f469 TY |
3098 | return emulate_ud(ctxt); |
3099 | ||
9dac77fa | 3100 | ctxt->dst.val = get_segment_selector(ctxt, ctxt->modrm_reg); |
1bd5f469 TY |
3101 | return X86EMUL_CONTINUE; |
3102 | } | |
3103 | ||
3104 | static int em_mov_sreg_rm(struct x86_emulate_ctxt *ctxt) | |
3105 | { | |
9dac77fa | 3106 | u16 sel = ctxt->src.val; |
1bd5f469 | 3107 | |
9dac77fa | 3108 | if (ctxt->modrm_reg == VCPU_SREG_CS || ctxt->modrm_reg > VCPU_SREG_GS) |
1bd5f469 TY |
3109 | return emulate_ud(ctxt); |
3110 | ||
9dac77fa | 3111 | if (ctxt->modrm_reg == VCPU_SREG_SS) |
1bd5f469 TY |
3112 | ctxt->interruptibility = KVM_X86_SHADOW_INT_MOV_SS; |
3113 | ||
3114 | /* Disable writeback. */ | |
9dac77fa AK |
3115 | ctxt->dst.type = OP_NONE; |
3116 | return load_segment_descriptor(ctxt, sel, ctxt->modrm_reg); | |
1bd5f469 TY |
3117 | } |
3118 | ||
a14e579f AK |
3119 | static int em_lldt(struct x86_emulate_ctxt *ctxt) |
3120 | { | |
3121 | u16 sel = ctxt->src.val; | |
3122 | ||
3123 | /* Disable writeback. */ | |
3124 | ctxt->dst.type = OP_NONE; | |
3125 | return load_segment_descriptor(ctxt, sel, VCPU_SREG_LDTR); | |
3126 | } | |
3127 | ||
80890006 AK |
3128 | static int em_ltr(struct x86_emulate_ctxt *ctxt) |
3129 | { | |
3130 | u16 sel = ctxt->src.val; | |
3131 | ||
3132 | /* Disable writeback. */ | |
3133 | ctxt->dst.type = OP_NONE; | |
3134 | return load_segment_descriptor(ctxt, sel, VCPU_SREG_TR); | |
3135 | } | |
3136 | ||
38503911 AK |
3137 | static int em_invlpg(struct x86_emulate_ctxt *ctxt) |
3138 | { | |
9fa088f4 AK |
3139 | int rc; |
3140 | ulong linear; | |
3141 | ||
9dac77fa | 3142 | rc = linearize(ctxt, ctxt->src.addr.mem, 1, false, &linear); |
9fa088f4 | 3143 | if (rc == X86EMUL_CONTINUE) |
3cb16fe7 | 3144 | ctxt->ops->invlpg(ctxt, linear); |
38503911 | 3145 | /* Disable writeback. */ |
9dac77fa | 3146 | ctxt->dst.type = OP_NONE; |
38503911 AK |
3147 | return X86EMUL_CONTINUE; |
3148 | } | |
3149 | ||
2d04a05b AK |
3150 | static int em_clts(struct x86_emulate_ctxt *ctxt) |
3151 | { | |
3152 | ulong cr0; | |
3153 | ||
3154 | cr0 = ctxt->ops->get_cr(ctxt, 0); | |
3155 | cr0 &= ~X86_CR0_TS; | |
3156 | ctxt->ops->set_cr(ctxt, 0, cr0); | |
3157 | return X86EMUL_CONTINUE; | |
3158 | } | |
3159 | ||
26d05cc7 AK |
3160 | static int em_vmcall(struct x86_emulate_ctxt *ctxt) |
3161 | { | |
26d05cc7 AK |
3162 | int rc; |
3163 | ||
9dac77fa | 3164 | if (ctxt->modrm_mod != 3 || ctxt->modrm_rm != 1) |
26d05cc7 AK |
3165 | return X86EMUL_UNHANDLEABLE; |
3166 | ||
3167 | rc = ctxt->ops->fix_hypercall(ctxt); | |
3168 | if (rc != X86EMUL_CONTINUE) | |
3169 | return rc; | |
3170 | ||
3171 | /* Let the processor re-execute the fixed hypercall */ | |
9dac77fa | 3172 | ctxt->_eip = ctxt->eip; |
26d05cc7 | 3173 | /* Disable writeback. */ |
9dac77fa | 3174 | ctxt->dst.type = OP_NONE; |
26d05cc7 AK |
3175 | return X86EMUL_CONTINUE; |
3176 | } | |
3177 | ||
96051572 AK |
3178 | static int emulate_store_desc_ptr(struct x86_emulate_ctxt *ctxt, |
3179 | void (*get)(struct x86_emulate_ctxt *ctxt, | |
3180 | struct desc_ptr *ptr)) | |
3181 | { | |
3182 | struct desc_ptr desc_ptr; | |
3183 | ||
3184 | if (ctxt->mode == X86EMUL_MODE_PROT64) | |
3185 | ctxt->op_bytes = 8; | |
3186 | get(ctxt, &desc_ptr); | |
3187 | if (ctxt->op_bytes == 2) { | |
3188 | ctxt->op_bytes = 4; | |
3189 | desc_ptr.address &= 0x00ffffff; | |
3190 | } | |
3191 | /* Disable writeback. */ | |
3192 | ctxt->dst.type = OP_NONE; | |
3193 | return segmented_write(ctxt, ctxt->dst.addr.mem, | |
3194 | &desc_ptr, 2 + ctxt->op_bytes); | |
3195 | } | |
3196 | ||
3197 | static int em_sgdt(struct x86_emulate_ctxt *ctxt) | |
3198 | { | |
3199 | return emulate_store_desc_ptr(ctxt, ctxt->ops->get_gdt); | |
3200 | } | |
3201 | ||
3202 | static int em_sidt(struct x86_emulate_ctxt *ctxt) | |
3203 | { | |
3204 | return emulate_store_desc_ptr(ctxt, ctxt->ops->get_idt); | |
3205 | } | |
3206 | ||
26d05cc7 AK |
3207 | static int em_lgdt(struct x86_emulate_ctxt *ctxt) |
3208 | { | |
26d05cc7 AK |
3209 | struct desc_ptr desc_ptr; |
3210 | int rc; | |
3211 | ||
510425ff AK |
3212 | if (ctxt->mode == X86EMUL_MODE_PROT64) |
3213 | ctxt->op_bytes = 8; | |
9dac77fa | 3214 | rc = read_descriptor(ctxt, ctxt->src.addr.mem, |
26d05cc7 | 3215 | &desc_ptr.size, &desc_ptr.address, |
9dac77fa | 3216 | ctxt->op_bytes); |
26d05cc7 AK |
3217 | if (rc != X86EMUL_CONTINUE) |
3218 | return rc; | |
3219 | ctxt->ops->set_gdt(ctxt, &desc_ptr); | |
3220 | /* Disable writeback. */ | |
9dac77fa | 3221 | ctxt->dst.type = OP_NONE; |
26d05cc7 AK |
3222 | return X86EMUL_CONTINUE; |
3223 | } | |
3224 | ||
5ef39c71 | 3225 | static int em_vmmcall(struct x86_emulate_ctxt *ctxt) |
26d05cc7 | 3226 | { |
26d05cc7 AK |
3227 | int rc; |
3228 | ||
5ef39c71 AK |
3229 | rc = ctxt->ops->fix_hypercall(ctxt); |
3230 | ||
26d05cc7 | 3231 | /* Disable writeback. */ |
9dac77fa | 3232 | ctxt->dst.type = OP_NONE; |
26d05cc7 AK |
3233 | return rc; |
3234 | } | |
3235 | ||
3236 | static int em_lidt(struct x86_emulate_ctxt *ctxt) | |
3237 | { | |
26d05cc7 AK |
3238 | struct desc_ptr desc_ptr; |
3239 | int rc; | |
3240 | ||
510425ff AK |
3241 | if (ctxt->mode == X86EMUL_MODE_PROT64) |
3242 | ctxt->op_bytes = 8; | |
9dac77fa | 3243 | rc = read_descriptor(ctxt, ctxt->src.addr.mem, |
509cf9fe | 3244 | &desc_ptr.size, &desc_ptr.address, |
9dac77fa | 3245 | ctxt->op_bytes); |
26d05cc7 AK |
3246 | if (rc != X86EMUL_CONTINUE) |
3247 | return rc; | |
3248 | ctxt->ops->set_idt(ctxt, &desc_ptr); | |
3249 | /* Disable writeback. */ | |
9dac77fa | 3250 | ctxt->dst.type = OP_NONE; |
26d05cc7 AK |
3251 | return X86EMUL_CONTINUE; |
3252 | } | |
3253 | ||
3254 | static int em_smsw(struct x86_emulate_ctxt *ctxt) | |
3255 | { | |
9dac77fa AK |
3256 | ctxt->dst.bytes = 2; |
3257 | ctxt->dst.val = ctxt->ops->get_cr(ctxt, 0); | |
26d05cc7 AK |
3258 | return X86EMUL_CONTINUE; |
3259 | } | |
3260 | ||
3261 | static int em_lmsw(struct x86_emulate_ctxt *ctxt) | |
3262 | { | |
26d05cc7 | 3263 | ctxt->ops->set_cr(ctxt, 0, (ctxt->ops->get_cr(ctxt, 0) & ~0x0eul) |
9dac77fa AK |
3264 | | (ctxt->src.val & 0x0f)); |
3265 | ctxt->dst.type = OP_NONE; | |
26d05cc7 AK |
3266 | return X86EMUL_CONTINUE; |
3267 | } | |
3268 | ||
d06e03ad TY |
3269 | static int em_loop(struct x86_emulate_ctxt *ctxt) |
3270 | { | |
dd856efa AK |
3271 | register_address_increment(ctxt, reg_rmw(ctxt, VCPU_REGS_RCX), -1); |
3272 | if ((address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) != 0) && | |
9dac77fa AK |
3273 | (ctxt->b == 0xe2 || test_cc(ctxt->b ^ 0x5, ctxt->eflags))) |
3274 | jmp_rel(ctxt, ctxt->src.val); | |
d06e03ad TY |
3275 | |
3276 | return X86EMUL_CONTINUE; | |
3277 | } | |
3278 | ||
3279 | static int em_jcxz(struct x86_emulate_ctxt *ctxt) | |
3280 | { | |
dd856efa | 3281 | if (address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) == 0) |
9dac77fa | 3282 | jmp_rel(ctxt, ctxt->src.val); |
d06e03ad TY |
3283 | |
3284 | return X86EMUL_CONTINUE; | |
3285 | } | |
3286 | ||
d7841a4b TY |
3287 | static int em_in(struct x86_emulate_ctxt *ctxt) |
3288 | { | |
3289 | if (!pio_in_emulated(ctxt, ctxt->dst.bytes, ctxt->src.val, | |
3290 | &ctxt->dst.val)) | |
3291 | return X86EMUL_IO_NEEDED; | |
3292 | ||
3293 | return X86EMUL_CONTINUE; | |
3294 | } | |
3295 | ||
3296 | static int em_out(struct x86_emulate_ctxt *ctxt) | |
3297 | { | |
3298 | ctxt->ops->pio_out_emulated(ctxt, ctxt->src.bytes, ctxt->dst.val, | |
3299 | &ctxt->src.val, 1); | |
3300 | /* Disable writeback. */ | |
3301 | ctxt->dst.type = OP_NONE; | |
3302 | return X86EMUL_CONTINUE; | |
3303 | } | |
3304 | ||
f411e6cd TY |
3305 | static int em_cli(struct x86_emulate_ctxt *ctxt) |
3306 | { | |
3307 | if (emulator_bad_iopl(ctxt)) | |
3308 | return emulate_gp(ctxt, 0); | |
3309 | ||
3310 | ctxt->eflags &= ~X86_EFLAGS_IF; | |
3311 | return X86EMUL_CONTINUE; | |
3312 | } | |
3313 | ||
3314 | static int em_sti(struct x86_emulate_ctxt *ctxt) | |
3315 | { | |
3316 | if (emulator_bad_iopl(ctxt)) | |
3317 | return emulate_gp(ctxt, 0); | |
3318 | ||
3319 | ctxt->interruptibility = KVM_X86_SHADOW_INT_STI; | |
3320 | ctxt->eflags |= X86_EFLAGS_IF; | |
3321 | return X86EMUL_CONTINUE; | |
3322 | } | |
3323 | ||
ce7faab2 TY |
3324 | static int em_bt(struct x86_emulate_ctxt *ctxt) |
3325 | { | |
3326 | /* Disable writeback. */ | |
3327 | ctxt->dst.type = OP_NONE; | |
3328 | /* only subword offset */ | |
3329 | ctxt->src.val &= (ctxt->dst.bytes << 3) - 1; | |
3330 | ||
3331 | emulate_2op_SrcV_nobyte(ctxt, "bt"); | |
3332 | return X86EMUL_CONTINUE; | |
3333 | } | |
3334 | ||
3335 | static int em_bts(struct x86_emulate_ctxt *ctxt) | |
3336 | { | |
3337 | emulate_2op_SrcV_nobyte(ctxt, "bts"); | |
3338 | return X86EMUL_CONTINUE; | |
3339 | } | |
3340 | ||
3341 | static int em_btr(struct x86_emulate_ctxt *ctxt) | |
3342 | { | |
3343 | emulate_2op_SrcV_nobyte(ctxt, "btr"); | |
3344 | return X86EMUL_CONTINUE; | |
3345 | } | |
3346 | ||
3347 | static int em_btc(struct x86_emulate_ctxt *ctxt) | |
3348 | { | |
3349 | emulate_2op_SrcV_nobyte(ctxt, "btc"); | |
3350 | return X86EMUL_CONTINUE; | |
3351 | } | |
3352 | ||
ff227392 TY |
3353 | static int em_bsf(struct x86_emulate_ctxt *ctxt) |
3354 | { | |
d54e4237 | 3355 | emulate_2op_SrcV_nobyte(ctxt, "bsf"); |
ff227392 TY |
3356 | return X86EMUL_CONTINUE; |
3357 | } | |
3358 | ||
3359 | static int em_bsr(struct x86_emulate_ctxt *ctxt) | |
3360 | { | |
d54e4237 | 3361 | emulate_2op_SrcV_nobyte(ctxt, "bsr"); |
ff227392 TY |
3362 | return X86EMUL_CONTINUE; |
3363 | } | |
3364 | ||
6d6eede4 AK |
3365 | static int em_cpuid(struct x86_emulate_ctxt *ctxt) |
3366 | { | |
3367 | u32 eax, ebx, ecx, edx; | |
3368 | ||
dd856efa AK |
3369 | eax = reg_read(ctxt, VCPU_REGS_RAX); |
3370 | ecx = reg_read(ctxt, VCPU_REGS_RCX); | |
6d6eede4 | 3371 | ctxt->ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx); |
dd856efa AK |
3372 | *reg_write(ctxt, VCPU_REGS_RAX) = eax; |
3373 | *reg_write(ctxt, VCPU_REGS_RBX) = ebx; | |
3374 | *reg_write(ctxt, VCPU_REGS_RCX) = ecx; | |
3375 | *reg_write(ctxt, VCPU_REGS_RDX) = edx; | |
6d6eede4 AK |
3376 | return X86EMUL_CONTINUE; |
3377 | } | |
3378 | ||
2dd7caa0 AK |
3379 | static int em_lahf(struct x86_emulate_ctxt *ctxt) |
3380 | { | |
dd856efa AK |
3381 | *reg_rmw(ctxt, VCPU_REGS_RAX) &= ~0xff00UL; |
3382 | *reg_rmw(ctxt, VCPU_REGS_RAX) |= (ctxt->eflags & 0xff) << 8; | |
2dd7caa0 AK |
3383 | return X86EMUL_CONTINUE; |
3384 | } | |
3385 | ||
9299836e AK |
3386 | static int em_bswap(struct x86_emulate_ctxt *ctxt) |
3387 | { | |
3388 | switch (ctxt->op_bytes) { | |
3389 | #ifdef CONFIG_X86_64 | |
3390 | case 8: | |
3391 | asm("bswap %0" : "+r"(ctxt->dst.val)); | |
3392 | break; | |
3393 | #endif | |
3394 | default: | |
3395 | asm("bswap %0" : "+r"(*(u32 *)&ctxt->dst.val)); | |
3396 | break; | |
3397 | } | |
3398 | return X86EMUL_CONTINUE; | |
3399 | } | |
3400 | ||
cfec82cb JR |
3401 | static bool valid_cr(int nr) |
3402 | { | |
3403 | switch (nr) { | |
3404 | case 0: | |
3405 | case 2 ... 4: | |
3406 | case 8: | |
3407 | return true; | |
3408 | default: | |
3409 | return false; | |
3410 | } | |
3411 | } | |
3412 | ||
3413 | static int check_cr_read(struct x86_emulate_ctxt *ctxt) | |
3414 | { | |
9dac77fa | 3415 | if (!valid_cr(ctxt->modrm_reg)) |
cfec82cb JR |
3416 | return emulate_ud(ctxt); |
3417 | ||
3418 | return X86EMUL_CONTINUE; | |
3419 | } | |
3420 | ||
3421 | static int check_cr_write(struct x86_emulate_ctxt *ctxt) | |
3422 | { | |
9dac77fa AK |
3423 | u64 new_val = ctxt->src.val64; |
3424 | int cr = ctxt->modrm_reg; | |
c2ad2bb3 | 3425 | u64 efer = 0; |
cfec82cb JR |
3426 | |
3427 | static u64 cr_reserved_bits[] = { | |
3428 | 0xffffffff00000000ULL, | |
3429 | 0, 0, 0, /* CR3 checked later */ | |
3430 | CR4_RESERVED_BITS, | |
3431 | 0, 0, 0, | |
3432 | CR8_RESERVED_BITS, | |
3433 | }; | |
3434 | ||
3435 | if (!valid_cr(cr)) | |
3436 | return emulate_ud(ctxt); | |
3437 | ||
3438 | if (new_val & cr_reserved_bits[cr]) | |
3439 | return emulate_gp(ctxt, 0); | |
3440 | ||
3441 | switch (cr) { | |
3442 | case 0: { | |
c2ad2bb3 | 3443 | u64 cr4; |
cfec82cb JR |
3444 | if (((new_val & X86_CR0_PG) && !(new_val & X86_CR0_PE)) || |
3445 | ((new_val & X86_CR0_NW) && !(new_val & X86_CR0_CD))) | |
3446 | return emulate_gp(ctxt, 0); | |
3447 | ||
717746e3 AK |
3448 | cr4 = ctxt->ops->get_cr(ctxt, 4); |
3449 | ctxt->ops->get_msr(ctxt, MSR_EFER, &efer); | |
cfec82cb JR |
3450 | |
3451 | if ((new_val & X86_CR0_PG) && (efer & EFER_LME) && | |
3452 | !(cr4 & X86_CR4_PAE)) | |
3453 | return emulate_gp(ctxt, 0); | |
3454 | ||
3455 | break; | |
3456 | } | |
3457 | case 3: { | |
3458 | u64 rsvd = 0; | |
3459 | ||
c2ad2bb3 AK |
3460 | ctxt->ops->get_msr(ctxt, MSR_EFER, &efer); |
3461 | if (efer & EFER_LMA) | |
cfec82cb | 3462 | rsvd = CR3_L_MODE_RESERVED_BITS; |
fd72c419 | 3463 | else if (ctxt->ops->get_cr(ctxt, 4) & X86_CR4_PAE) |
cfec82cb | 3464 | rsvd = CR3_PAE_RESERVED_BITS; |
fd72c419 | 3465 | else if (ctxt->ops->get_cr(ctxt, 0) & X86_CR0_PG) |
cfec82cb JR |
3466 | rsvd = CR3_NONPAE_RESERVED_BITS; |
3467 | ||
3468 | if (new_val & rsvd) | |
3469 | return emulate_gp(ctxt, 0); | |
3470 | ||
3471 | break; | |
3472 | } | |
3473 | case 4: { | |
717746e3 | 3474 | ctxt->ops->get_msr(ctxt, MSR_EFER, &efer); |
cfec82cb JR |
3475 | |
3476 | if ((efer & EFER_LMA) && !(new_val & X86_CR4_PAE)) | |
3477 | return emulate_gp(ctxt, 0); | |
3478 | ||
3479 | break; | |
3480 | } | |
3481 | } | |
3482 | ||
3483 | return X86EMUL_CONTINUE; | |
3484 | } | |
3485 | ||
3b88e41a JR |
3486 | static int check_dr7_gd(struct x86_emulate_ctxt *ctxt) |
3487 | { | |
3488 | unsigned long dr7; | |
3489 | ||
717746e3 | 3490 | ctxt->ops->get_dr(ctxt, 7, &dr7); |
3b88e41a JR |
3491 | |
3492 | /* Check if DR7.Global_Enable is set */ | |
3493 | return dr7 & (1 << 13); | |
3494 | } | |
3495 | ||
3496 | static int check_dr_read(struct x86_emulate_ctxt *ctxt) | |
3497 | { | |
9dac77fa | 3498 | int dr = ctxt->modrm_reg; |
3b88e41a JR |
3499 | u64 cr4; |
3500 | ||
3501 | if (dr > 7) | |
3502 | return emulate_ud(ctxt); | |
3503 | ||
717746e3 | 3504 | cr4 = ctxt->ops->get_cr(ctxt, 4); |
3b88e41a JR |
3505 | if ((cr4 & X86_CR4_DE) && (dr == 4 || dr == 5)) |
3506 | return emulate_ud(ctxt); | |
3507 | ||
3508 | if (check_dr7_gd(ctxt)) | |
3509 | return emulate_db(ctxt); | |
3510 | ||
3511 | return X86EMUL_CONTINUE; | |
3512 | } | |
3513 | ||
3514 | static int check_dr_write(struct x86_emulate_ctxt *ctxt) | |
3515 | { | |
9dac77fa AK |
3516 | u64 new_val = ctxt->src.val64; |
3517 | int dr = ctxt->modrm_reg; | |
3b88e41a JR |
3518 | |
3519 | if ((dr == 6 || dr == 7) && (new_val & 0xffffffff00000000ULL)) | |
3520 | return emulate_gp(ctxt, 0); | |
3521 | ||
3522 | return check_dr_read(ctxt); | |
3523 | } | |
3524 | ||
01de8b09 JR |
3525 | static int check_svme(struct x86_emulate_ctxt *ctxt) |
3526 | { | |
3527 | u64 efer; | |
3528 | ||
717746e3 | 3529 | ctxt->ops->get_msr(ctxt, MSR_EFER, &efer); |
01de8b09 JR |
3530 | |
3531 | if (!(efer & EFER_SVME)) | |
3532 | return emulate_ud(ctxt); | |
3533 | ||
3534 | return X86EMUL_CONTINUE; | |
3535 | } | |
3536 | ||
3537 | static int check_svme_pa(struct x86_emulate_ctxt *ctxt) | |
3538 | { | |
dd856efa | 3539 | u64 rax = reg_read(ctxt, VCPU_REGS_RAX); |
01de8b09 JR |
3540 | |
3541 | /* Valid physical address? */ | |
d4224449 | 3542 | if (rax & 0xffff000000000000ULL) |
01de8b09 JR |
3543 | return emulate_gp(ctxt, 0); |
3544 | ||
3545 | return check_svme(ctxt); | |
3546 | } | |
3547 | ||
d7eb8203 JR |
3548 | static int check_rdtsc(struct x86_emulate_ctxt *ctxt) |
3549 | { | |
717746e3 | 3550 | u64 cr4 = ctxt->ops->get_cr(ctxt, 4); |
d7eb8203 | 3551 | |
717746e3 | 3552 | if (cr4 & X86_CR4_TSD && ctxt->ops->cpl(ctxt)) |
d7eb8203 JR |
3553 | return emulate_ud(ctxt); |
3554 | ||
3555 | return X86EMUL_CONTINUE; | |
3556 | } | |
3557 | ||
8061252e JR |
3558 | static int check_rdpmc(struct x86_emulate_ctxt *ctxt) |
3559 | { | |
717746e3 | 3560 | u64 cr4 = ctxt->ops->get_cr(ctxt, 4); |
dd856efa | 3561 | u64 rcx = reg_read(ctxt, VCPU_REGS_RCX); |
8061252e | 3562 | |
717746e3 | 3563 | if ((!(cr4 & X86_CR4_PCE) && ctxt->ops->cpl(ctxt)) || |
8061252e JR |
3564 | (rcx > 3)) |
3565 | return emulate_gp(ctxt, 0); | |
3566 | ||
3567 | return X86EMUL_CONTINUE; | |
3568 | } | |
3569 | ||
f6511935 JR |
3570 | static int check_perm_in(struct x86_emulate_ctxt *ctxt) |
3571 | { | |
9dac77fa AK |
3572 | ctxt->dst.bytes = min(ctxt->dst.bytes, 4u); |
3573 | if (!emulator_io_permited(ctxt, ctxt->src.val, ctxt->dst.bytes)) | |
f6511935 JR |
3574 | return emulate_gp(ctxt, 0); |
3575 | ||
3576 | return X86EMUL_CONTINUE; | |
3577 | } | |
3578 | ||
3579 | static int check_perm_out(struct x86_emulate_ctxt *ctxt) | |
3580 | { | |
9dac77fa AK |
3581 | ctxt->src.bytes = min(ctxt->src.bytes, 4u); |
3582 | if (!emulator_io_permited(ctxt, ctxt->dst.val, ctxt->src.bytes)) | |
f6511935 JR |
3583 | return emulate_gp(ctxt, 0); |
3584 | ||
3585 | return X86EMUL_CONTINUE; | |
3586 | } | |
3587 | ||
73fba5f4 | 3588 | #define D(_y) { .flags = (_y) } |
c4f035c6 | 3589 | #define DI(_y, _i) { .flags = (_y), .intercept = x86_intercept_##_i } |
d09beabd JR |
3590 | #define DIP(_y, _i, _p) { .flags = (_y), .intercept = x86_intercept_##_i, \ |
3591 | .check_perm = (_p) } | |
73fba5f4 | 3592 | #define N D(0) |
01de8b09 | 3593 | #define EXT(_f, _e) { .flags = ((_f) | RMExt), .u.group = (_e) } |
1c2545be TY |
3594 | #define G(_f, _g) { .flags = ((_f) | Group | ModRM), .u.group = (_g) } |
3595 | #define GD(_f, _g) { .flags = ((_f) | GroupDual | ModRM), .u.gdual = (_g) } | |
73fba5f4 | 3596 | #define I(_f, _e) { .flags = (_f), .u.execute = (_e) } |
c4f035c6 AK |
3597 | #define II(_f, _e, _i) \ |
3598 | { .flags = (_f), .u.execute = (_e), .intercept = x86_intercept_##_i } | |
d09beabd JR |
3599 | #define IIP(_f, _e, _i, _p) \ |
3600 | { .flags = (_f), .u.execute = (_e), .intercept = x86_intercept_##_i, \ | |
3601 | .check_perm = (_p) } | |
aa97bb48 | 3602 | #define GP(_f, _g) { .flags = ((_f) | Prefix), .u.gprefix = (_g) } |
73fba5f4 | 3603 | |
8d8f4e9f | 3604 | #define D2bv(_f) D((_f) | ByteOp), D(_f) |
f6511935 | 3605 | #define D2bvIP(_f, _i, _p) DIP((_f) | ByteOp, _i, _p), DIP(_f, _i, _p) |
8d8f4e9f | 3606 | #define I2bv(_f, _e) I((_f) | ByteOp, _e), I(_f, _e) |
d7841a4b TY |
3607 | #define I2bvIP(_f, _e, _i, _p) \ |
3608 | IIP((_f) | ByteOp, _e, _i, _p), IIP(_f, _e, _i, _p) | |
8d8f4e9f | 3609 | |
d67fc27a TY |
3610 | #define I6ALU(_f, _e) I2bv((_f) | DstMem | SrcReg | ModRM, _e), \ |
3611 | I2bv(((_f) | DstReg | SrcMem | ModRM) & ~Lock, _e), \ | |
3612 | I2bv(((_f) & ~Lock) | DstAcc | SrcImm, _e) | |
6230f7fc | 3613 | |
fd0a0d82 | 3614 | static const struct opcode group7_rm1[] = { |
1c2545be TY |
3615 | DI(SrcNone | Priv, monitor), |
3616 | DI(SrcNone | Priv, mwait), | |
d7eb8203 JR |
3617 | N, N, N, N, N, N, |
3618 | }; | |
3619 | ||
fd0a0d82 | 3620 | static const struct opcode group7_rm3[] = { |
1c2545be TY |
3621 | DIP(SrcNone | Prot | Priv, vmrun, check_svme_pa), |
3622 | II(SrcNone | Prot | VendorSpecific, em_vmmcall, vmmcall), | |
3623 | DIP(SrcNone | Prot | Priv, vmload, check_svme_pa), | |
3624 | DIP(SrcNone | Prot | Priv, vmsave, check_svme_pa), | |
3625 | DIP(SrcNone | Prot | Priv, stgi, check_svme), | |
3626 | DIP(SrcNone | Prot | Priv, clgi, check_svme), | |
3627 | DIP(SrcNone | Prot | Priv, skinit, check_svme), | |
3628 | DIP(SrcNone | Prot | Priv, invlpga, check_svme), | |
01de8b09 | 3629 | }; |
6230f7fc | 3630 | |
fd0a0d82 | 3631 | static const struct opcode group7_rm7[] = { |
d7eb8203 | 3632 | N, |
1c2545be | 3633 | DIP(SrcNone, rdtscp, check_rdtsc), |
d7eb8203 JR |
3634 | N, N, N, N, N, N, |
3635 | }; | |
d67fc27a | 3636 | |
fd0a0d82 | 3637 | static const struct opcode group1[] = { |
d67fc27a | 3638 | I(Lock, em_add), |
d5ae7ce8 | 3639 | I(Lock | PageTable, em_or), |
d67fc27a TY |
3640 | I(Lock, em_adc), |
3641 | I(Lock, em_sbb), | |
d5ae7ce8 | 3642 | I(Lock | PageTable, em_and), |
d67fc27a TY |
3643 | I(Lock, em_sub), |
3644 | I(Lock, em_xor), | |
3645 | I(0, em_cmp), | |
73fba5f4 AK |
3646 | }; |
3647 | ||
fd0a0d82 | 3648 | static const struct opcode group1A[] = { |
1c2545be | 3649 | I(DstMem | SrcNone | Mov | Stack, em_pop), N, N, N, N, N, N, N, |
73fba5f4 AK |
3650 | }; |
3651 | ||
fd0a0d82 | 3652 | static const struct opcode group3[] = { |
1c2545be TY |
3653 | I(DstMem | SrcImm, em_test), |
3654 | I(DstMem | SrcImm, em_test), | |
3655 | I(DstMem | SrcNone | Lock, em_not), | |
3656 | I(DstMem | SrcNone | Lock, em_neg), | |
3657 | I(SrcMem, em_mul_ex), | |
3658 | I(SrcMem, em_imul_ex), | |
3659 | I(SrcMem, em_div_ex), | |
3660 | I(SrcMem, em_idiv_ex), | |
73fba5f4 AK |
3661 | }; |
3662 | ||
fd0a0d82 | 3663 | static const struct opcode group4[] = { |
1c2545be TY |
3664 | I(ByteOp | DstMem | SrcNone | Lock, em_grp45), |
3665 | I(ByteOp | DstMem | SrcNone | Lock, em_grp45), | |
73fba5f4 AK |
3666 | N, N, N, N, N, N, |
3667 | }; | |
3668 | ||
fd0a0d82 | 3669 | static const struct opcode group5[] = { |
1c2545be TY |
3670 | I(DstMem | SrcNone | Lock, em_grp45), |
3671 | I(DstMem | SrcNone | Lock, em_grp45), | |
3672 | I(SrcMem | Stack, em_grp45), | |
3673 | I(SrcMemFAddr | ImplicitOps | Stack, em_call_far), | |
3674 | I(SrcMem | Stack, em_grp45), | |
3675 | I(SrcMemFAddr | ImplicitOps, em_grp45), | |
3676 | I(SrcMem | Stack, em_grp45), N, | |
73fba5f4 AK |
3677 | }; |
3678 | ||
fd0a0d82 | 3679 | static const struct opcode group6[] = { |
1c2545be TY |
3680 | DI(Prot, sldt), |
3681 | DI(Prot, str), | |
a14e579f | 3682 | II(Prot | Priv | SrcMem16, em_lldt, lldt), |
80890006 | 3683 | II(Prot | Priv | SrcMem16, em_ltr, ltr), |
dee6bb70 JR |
3684 | N, N, N, N, |
3685 | }; | |
3686 | ||
fd0a0d82 | 3687 | static const struct group_dual group7 = { { |
96051572 AK |
3688 | II(Mov | DstMem | Priv, em_sgdt, sgdt), |
3689 | II(Mov | DstMem | Priv, em_sidt, sidt), | |
1c2545be TY |
3690 | II(SrcMem | Priv, em_lgdt, lgdt), |
3691 | II(SrcMem | Priv, em_lidt, lidt), | |
3692 | II(SrcNone | DstMem | Mov, em_smsw, smsw), N, | |
3693 | II(SrcMem16 | Mov | Priv, em_lmsw, lmsw), | |
3694 | II(SrcMem | ByteOp | Priv | NoAccess, em_invlpg, invlpg), | |
73fba5f4 | 3695 | }, { |
1c2545be | 3696 | I(SrcNone | Priv | VendorSpecific, em_vmcall), |
5ef39c71 | 3697 | EXT(0, group7_rm1), |
01de8b09 | 3698 | N, EXT(0, group7_rm3), |
1c2545be TY |
3699 | II(SrcNone | DstMem | Mov, em_smsw, smsw), N, |
3700 | II(SrcMem16 | Mov | Priv, em_lmsw, lmsw), | |
3701 | EXT(0, group7_rm7), | |
73fba5f4 AK |
3702 | } }; |
3703 | ||
fd0a0d82 | 3704 | static const struct opcode group8[] = { |
73fba5f4 | 3705 | N, N, N, N, |
1c2545be TY |
3706 | I(DstMem | SrcImmByte, em_bt), |
3707 | I(DstMem | SrcImmByte | Lock | PageTable, em_bts), | |
3708 | I(DstMem | SrcImmByte | Lock, em_btr), | |
3709 | I(DstMem | SrcImmByte | Lock | PageTable, em_btc), | |
73fba5f4 AK |
3710 | }; |
3711 | ||
fd0a0d82 | 3712 | static const struct group_dual group9 = { { |
1c2545be | 3713 | N, I(DstMem64 | Lock | PageTable, em_cmpxchg8b), N, N, N, N, N, N, |
73fba5f4 AK |
3714 | }, { |
3715 | N, N, N, N, N, N, N, N, | |
3716 | } }; | |
3717 | ||
fd0a0d82 | 3718 | static const struct opcode group11[] = { |
1c2545be | 3719 | I(DstMem | SrcImm | Mov | PageTable, em_mov), |
d5ae7ce8 | 3720 | X7(D(Undefined)), |
a4d4a7c1 AK |
3721 | }; |
3722 | ||
fd0a0d82 | 3723 | static const struct gprefix pfx_0f_6f_0f_7f = { |
e5971755 | 3724 | I(Mmx, em_mov), I(Sse | Aligned, em_mov), N, I(Sse | Unaligned, em_mov), |
aa97bb48 AK |
3725 | }; |
3726 | ||
fd0a0d82 | 3727 | static const struct gprefix pfx_vmovntpx = { |
3e114eb4 AK |
3728 | I(0, em_mov), N, N, N, |
3729 | }; | |
3730 | ||
fd0a0d82 | 3731 | static const struct opcode opcode_table[256] = { |
73fba5f4 | 3732 | /* 0x00 - 0x07 */ |
d67fc27a | 3733 | I6ALU(Lock, em_add), |
1cd196ea AK |
3734 | I(ImplicitOps | Stack | No64 | Src2ES, em_push_sreg), |
3735 | I(ImplicitOps | Stack | No64 | Src2ES, em_pop_sreg), | |
73fba5f4 | 3736 | /* 0x08 - 0x0F */ |
d5ae7ce8 | 3737 | I6ALU(Lock | PageTable, em_or), |
1cd196ea AK |
3738 | I(ImplicitOps | Stack | No64 | Src2CS, em_push_sreg), |
3739 | N, | |
73fba5f4 | 3740 | /* 0x10 - 0x17 */ |
d67fc27a | 3741 | I6ALU(Lock, em_adc), |
1cd196ea AK |
3742 | I(ImplicitOps | Stack | No64 | Src2SS, em_push_sreg), |
3743 | I(ImplicitOps | Stack | No64 | Src2SS, em_pop_sreg), | |
73fba5f4 | 3744 | /* 0x18 - 0x1F */ |
d67fc27a | 3745 | I6ALU(Lock, em_sbb), |
1cd196ea AK |
3746 | I(ImplicitOps | Stack | No64 | Src2DS, em_push_sreg), |
3747 | I(ImplicitOps | Stack | No64 | Src2DS, em_pop_sreg), | |
73fba5f4 | 3748 | /* 0x20 - 0x27 */ |
d5ae7ce8 | 3749 | I6ALU(Lock | PageTable, em_and), N, N, |
73fba5f4 | 3750 | /* 0x28 - 0x2F */ |
d67fc27a | 3751 | I6ALU(Lock, em_sub), N, I(ByteOp | DstAcc | No64, em_das), |
73fba5f4 | 3752 | /* 0x30 - 0x37 */ |
d67fc27a | 3753 | I6ALU(Lock, em_xor), N, N, |
73fba5f4 | 3754 | /* 0x38 - 0x3F */ |
d67fc27a | 3755 | I6ALU(0, em_cmp), N, N, |
73fba5f4 AK |
3756 | /* 0x40 - 0x4F */ |
3757 | X16(D(DstReg)), | |
3758 | /* 0x50 - 0x57 */ | |
63540382 | 3759 | X8(I(SrcReg | Stack, em_push)), |
73fba5f4 | 3760 | /* 0x58 - 0x5F */ |
c54fe504 | 3761 | X8(I(DstReg | Stack, em_pop)), |
73fba5f4 | 3762 | /* 0x60 - 0x67 */ |
b96a7fad TY |
3763 | I(ImplicitOps | Stack | No64, em_pusha), |
3764 | I(ImplicitOps | Stack | No64, em_popa), | |
73fba5f4 AK |
3765 | N, D(DstReg | SrcMem32 | ModRM | Mov) /* movsxd (x86/64) */ , |
3766 | N, N, N, N, | |
3767 | /* 0x68 - 0x6F */ | |
d46164db AK |
3768 | I(SrcImm | Mov | Stack, em_push), |
3769 | I(DstReg | SrcMem | ModRM | Src2Imm, em_imul_3op), | |
f3a1b9f4 AK |
3770 | I(SrcImmByte | Mov | Stack, em_push), |
3771 | I(DstReg | SrcMem | ModRM | Src2ImmByte, em_imul_3op), | |
b3356bf0 | 3772 | I2bvIP(DstDI | SrcDX | Mov | String | Unaligned, em_in, ins, check_perm_in), /* insb, insw/insd */ |
2b5e97e1 | 3773 | I2bvIP(SrcSI | DstDX | String, em_out, outs, check_perm_out), /* outsb, outsw/outsd */ |
73fba5f4 AK |
3774 | /* 0x70 - 0x7F */ |
3775 | X16(D(SrcImmByte)), | |
3776 | /* 0x80 - 0x87 */ | |
1c2545be TY |
3777 | G(ByteOp | DstMem | SrcImm, group1), |
3778 | G(DstMem | SrcImm, group1), | |
3779 | G(ByteOp | DstMem | SrcImm | No64, group1), | |
3780 | G(DstMem | SrcImmByte, group1), | |
9f21ca59 | 3781 | I2bv(DstMem | SrcReg | ModRM, em_test), |
d5ae7ce8 | 3782 | I2bv(DstMem | SrcReg | ModRM | Lock | PageTable, em_xchg), |
73fba5f4 | 3783 | /* 0x88 - 0x8F */ |
d5ae7ce8 | 3784 | I2bv(DstMem | SrcReg | ModRM | Mov | PageTable, em_mov), |
b9eac5f4 | 3785 | I2bv(DstReg | SrcMem | ModRM | Mov, em_mov), |
d5ae7ce8 | 3786 | I(DstMem | SrcNone | ModRM | Mov | PageTable, em_mov_rm_sreg), |
1bd5f469 TY |
3787 | D(ModRM | SrcMem | NoAccess | DstReg), |
3788 | I(ImplicitOps | SrcMem16 | ModRM, em_mov_sreg_rm), | |
3789 | G(0, group1A), | |
73fba5f4 | 3790 | /* 0x90 - 0x97 */ |
bf608f88 | 3791 | DI(SrcAcc | DstReg, pause), X7(D(SrcAcc | DstReg)), |
73fba5f4 | 3792 | /* 0x98 - 0x9F */ |
61429142 | 3793 | D(DstAcc | SrcNone), I(ImplicitOps | SrcAcc, em_cwd), |
cc4feed5 | 3794 | I(SrcImmFAddr | No64, em_call_far), N, |
62aaa2f0 | 3795 | II(ImplicitOps | Stack, em_pushf, pushf), |
2dd7caa0 | 3796 | II(ImplicitOps | Stack, em_popf, popf), N, I(ImplicitOps, em_lahf), |
73fba5f4 | 3797 | /* 0xA0 - 0xA7 */ |
b9eac5f4 | 3798 | I2bv(DstAcc | SrcMem | Mov | MemAbs, em_mov), |
d5ae7ce8 | 3799 | I2bv(DstMem | SrcAcc | Mov | MemAbs | PageTable, em_mov), |
b9eac5f4 | 3800 | I2bv(SrcSI | DstDI | Mov | String, em_mov), |
d67fc27a | 3801 | I2bv(SrcSI | DstDI | String, em_cmp), |
73fba5f4 | 3802 | /* 0xA8 - 0xAF */ |
9f21ca59 | 3803 | I2bv(DstAcc | SrcImm, em_test), |
b9eac5f4 AK |
3804 | I2bv(SrcAcc | DstDI | Mov | String, em_mov), |
3805 | I2bv(SrcSI | DstAcc | Mov | String, em_mov), | |
d67fc27a | 3806 | I2bv(SrcAcc | DstDI | String, em_cmp), |
73fba5f4 | 3807 | /* 0xB0 - 0xB7 */ |
b9eac5f4 | 3808 | X8(I(ByteOp | DstReg | SrcImm | Mov, em_mov)), |
73fba5f4 | 3809 | /* 0xB8 - 0xBF */ |
b9eac5f4 | 3810 | X8(I(DstReg | SrcImm | Mov, em_mov)), |
73fba5f4 | 3811 | /* 0xC0 - 0xC7 */ |
d2c6c7ad | 3812 | D2bv(DstMem | SrcImmByte | ModRM), |
40ece7c7 | 3813 | I(ImplicitOps | Stack | SrcImmU16, em_ret_near_imm), |
ebda02c2 | 3814 | I(ImplicitOps | Stack, em_ret), |
d4b4325f AK |
3815 | I(DstReg | SrcMemFAddr | ModRM | No64 | Src2ES, em_lseg), |
3816 | I(DstReg | SrcMemFAddr | ModRM | No64 | Src2DS, em_lseg), | |
a4d4a7c1 | 3817 | G(ByteOp, group11), G(0, group11), |
73fba5f4 | 3818 | /* 0xC8 - 0xCF */ |
612e89f0 AK |
3819 | I(Stack | SrcImmU16 | Src2ImmByte, em_enter), I(Stack, em_leave), |
3820 | N, I(ImplicitOps | Stack, em_ret_far), | |
3c6e276f | 3821 | D(ImplicitOps), DI(SrcImmByte, intn), |
db5b0762 | 3822 | D(ImplicitOps | No64), II(ImplicitOps, em_iret, iret), |
73fba5f4 | 3823 | /* 0xD0 - 0xD7 */ |
d2c6c7ad | 3824 | D2bv(DstMem | SrcOne | ModRM), D2bv(DstMem | ModRM), |
7f662273 | 3825 | N, I(DstAcc | SrcImmByte | No64, em_aad), N, N, |
73fba5f4 AK |
3826 | /* 0xD8 - 0xDF */ |
3827 | N, N, N, N, N, N, N, N, | |
3828 | /* 0xE0 - 0xE7 */ | |
d06e03ad TY |
3829 | X3(I(SrcImmByte, em_loop)), |
3830 | I(SrcImmByte, em_jcxz), | |
d7841a4b TY |
3831 | I2bvIP(SrcImmUByte | DstAcc, em_in, in, check_perm_in), |
3832 | I2bvIP(SrcAcc | DstImmUByte, em_out, out, check_perm_out), | |
73fba5f4 | 3833 | /* 0xE8 - 0xEF */ |
d4ddafcd | 3834 | I(SrcImm | Stack, em_call), D(SrcImm | ImplicitOps), |
db5b0762 | 3835 | I(SrcImmFAddr | No64, em_jmp_far), D(SrcImmByte | ImplicitOps), |
d7841a4b TY |
3836 | I2bvIP(SrcDX | DstAcc, em_in, in, check_perm_in), |
3837 | I2bvIP(SrcAcc | DstDX, em_out, out, check_perm_out), | |
73fba5f4 | 3838 | /* 0xF0 - 0xF7 */ |
bf608f88 | 3839 | N, DI(ImplicitOps, icebp), N, N, |
3c6e276f AK |
3840 | DI(ImplicitOps | Priv, hlt), D(ImplicitOps), |
3841 | G(ByteOp, group3), G(0, group3), | |
73fba5f4 | 3842 | /* 0xF8 - 0xFF */ |
f411e6cd TY |
3843 | D(ImplicitOps), D(ImplicitOps), |
3844 | I(ImplicitOps, em_cli), I(ImplicitOps, em_sti), | |
73fba5f4 AK |
3845 | D(ImplicitOps), D(ImplicitOps), G(0, group4), G(0, group5), |
3846 | }; | |
3847 | ||
fd0a0d82 | 3848 | static const struct opcode twobyte_table[256] = { |
73fba5f4 | 3849 | /* 0x00 - 0x0F */ |
dee6bb70 | 3850 | G(0, group6), GD(0, &group7), N, N, |
db5b0762 TY |
3851 | N, I(ImplicitOps | VendorSpecific, em_syscall), |
3852 | II(ImplicitOps | Priv, em_clts, clts), N, | |
3c6e276f | 3853 | DI(ImplicitOps | Priv, invd), DI(ImplicitOps | Priv, wbinvd), N, N, |
73fba5f4 AK |
3854 | N, D(ImplicitOps | ModRM), N, N, |
3855 | /* 0x10 - 0x1F */ | |
3856 | N, N, N, N, N, N, N, N, D(ImplicitOps | ModRM), N, N, N, N, N, N, N, | |
3857 | /* 0x20 - 0x2F */ | |
cfec82cb | 3858 | DIP(ModRM | DstMem | Priv | Op3264, cr_read, check_cr_read), |
3b88e41a | 3859 | DIP(ModRM | DstMem | Priv | Op3264, dr_read, check_dr_read), |
bc00f8d2 TY |
3860 | IIP(ModRM | SrcMem | Priv | Op3264, em_cr_write, cr_write, check_cr_write), |
3861 | IIP(ModRM | SrcMem | Priv | Op3264, em_dr_write, dr_write, check_dr_write), | |
73fba5f4 | 3862 | N, N, N, N, |
3e114eb4 AK |
3863 | N, N, N, GP(ModRM | DstMem | SrcReg | Sse | Mov | Aligned, &pfx_vmovntpx), |
3864 | N, N, N, N, | |
73fba5f4 | 3865 | /* 0x30 - 0x3F */ |
e1e210b0 | 3866 | II(ImplicitOps | Priv, em_wrmsr, wrmsr), |
8061252e | 3867 | IIP(ImplicitOps, em_rdtsc, rdtsc, check_rdtsc), |
e1e210b0 | 3868 | II(ImplicitOps | Priv, em_rdmsr, rdmsr), |
222d21aa | 3869 | IIP(ImplicitOps, em_rdpmc, rdpmc, check_rdpmc), |
db5b0762 TY |
3870 | I(ImplicitOps | VendorSpecific, em_sysenter), |
3871 | I(ImplicitOps | Priv | VendorSpecific, em_sysexit), | |
d867162c | 3872 | N, N, |
73fba5f4 AK |
3873 | N, N, N, N, N, N, N, N, |
3874 | /* 0x40 - 0x4F */ | |
3875 | X16(D(DstReg | SrcMem | ModRM | Mov)), | |
3876 | /* 0x50 - 0x5F */ | |
3877 | N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, | |
3878 | /* 0x60 - 0x6F */ | |
aa97bb48 AK |
3879 | N, N, N, N, |
3880 | N, N, N, N, | |
3881 | N, N, N, N, | |
3882 | N, N, N, GP(SrcMem | DstReg | ModRM | Mov, &pfx_0f_6f_0f_7f), | |
73fba5f4 | 3883 | /* 0x70 - 0x7F */ |
aa97bb48 AK |
3884 | N, N, N, N, |
3885 | N, N, N, N, | |
3886 | N, N, N, N, | |
3887 | N, N, N, GP(SrcReg | DstMem | ModRM | Mov, &pfx_0f_6f_0f_7f), | |
73fba5f4 AK |
3888 | /* 0x80 - 0x8F */ |
3889 | X16(D(SrcImm)), | |
3890 | /* 0x90 - 0x9F */ | |
ee45b58e | 3891 | X16(D(ByteOp | DstMem | SrcNone | ModRM| Mov)), |
73fba5f4 | 3892 | /* 0xA0 - 0xA7 */ |
1cd196ea | 3893 | I(Stack | Src2FS, em_push_sreg), I(Stack | Src2FS, em_pop_sreg), |
6d6eede4 | 3894 | II(ImplicitOps, em_cpuid, cpuid), I(DstMem | SrcReg | ModRM | BitOp, em_bt), |
73fba5f4 AK |
3895 | D(DstMem | SrcReg | Src2ImmByte | ModRM), |
3896 | D(DstMem | SrcReg | Src2CL | ModRM), N, N, | |
3897 | /* 0xA8 - 0xAF */ | |
1cd196ea | 3898 | I(Stack | Src2GS, em_push_sreg), I(Stack | Src2GS, em_pop_sreg), |
d5ae7ce8 | 3899 | DI(ImplicitOps, rsm), |
ce7faab2 | 3900 | I(DstMem | SrcReg | ModRM | BitOp | Lock | PageTable, em_bts), |
73fba5f4 AK |
3901 | D(DstMem | SrcReg | Src2ImmByte | ModRM), |
3902 | D(DstMem | SrcReg | Src2CL | ModRM), | |
5c82aa29 | 3903 | D(ModRM), I(DstReg | SrcMem | ModRM, em_imul), |
73fba5f4 | 3904 | /* 0xB0 - 0xB7 */ |
e940b5c2 | 3905 | I2bv(DstMem | SrcReg | ModRM | Lock | PageTable, em_cmpxchg), |
d4b4325f | 3906 | I(DstReg | SrcMemFAddr | ModRM | Src2SS, em_lseg), |
ce7faab2 | 3907 | I(DstMem | SrcReg | ModRM | BitOp | Lock, em_btr), |
d4b4325f AK |
3908 | I(DstReg | SrcMemFAddr | ModRM | Src2FS, em_lseg), |
3909 | I(DstReg | SrcMemFAddr | ModRM | Src2GS, em_lseg), | |
2adb5ad9 | 3910 | D(DstReg | SrcMem8 | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov), |
73fba5f4 AK |
3911 | /* 0xB8 - 0xBF */ |
3912 | N, N, | |
ce7faab2 TY |
3913 | G(BitOp, group8), |
3914 | I(DstMem | SrcReg | ModRM | BitOp | Lock | PageTable, em_btc), | |
ff227392 | 3915 | I(DstReg | SrcMem | ModRM, em_bsf), I(DstReg | SrcMem | ModRM, em_bsr), |
2adb5ad9 | 3916 | D(DstReg | SrcMem8 | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov), |
9299836e | 3917 | /* 0xC0 - 0xC7 */ |
739ae406 | 3918 | D2bv(DstMem | SrcReg | ModRM | Lock), |
92f738a5 | 3919 | N, D(DstMem | SrcReg | ModRM | Mov), |
73fba5f4 | 3920 | N, N, N, GD(0, &group9), |
9299836e AK |
3921 | /* 0xC8 - 0xCF */ |
3922 | X8(I(DstReg, em_bswap)), | |
73fba5f4 AK |
3923 | /* 0xD0 - 0xDF */ |
3924 | N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, | |
3925 | /* 0xE0 - 0xEF */ | |
3926 | N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, | |
3927 | /* 0xF0 - 0xFF */ | |
3928 | N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N | |
3929 | }; | |
3930 | ||
3931 | #undef D | |
3932 | #undef N | |
3933 | #undef G | |
3934 | #undef GD | |
3935 | #undef I | |
aa97bb48 | 3936 | #undef GP |
01de8b09 | 3937 | #undef EXT |
73fba5f4 | 3938 | |
8d8f4e9f | 3939 | #undef D2bv |
f6511935 | 3940 | #undef D2bvIP |
8d8f4e9f | 3941 | #undef I2bv |
d7841a4b | 3942 | #undef I2bvIP |
d67fc27a | 3943 | #undef I6ALU |
8d8f4e9f | 3944 | |
9dac77fa | 3945 | static unsigned imm_size(struct x86_emulate_ctxt *ctxt) |
39f21ee5 AK |
3946 | { |
3947 | unsigned size; | |
3948 | ||
9dac77fa | 3949 | size = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; |
39f21ee5 AK |
3950 | if (size == 8) |
3951 | size = 4; | |
3952 | return size; | |
3953 | } | |
3954 | ||
3955 | static int decode_imm(struct x86_emulate_ctxt *ctxt, struct operand *op, | |
3956 | unsigned size, bool sign_extension) | |
3957 | { | |
39f21ee5 AK |
3958 | int rc = X86EMUL_CONTINUE; |
3959 | ||
3960 | op->type = OP_IMM; | |
3961 | op->bytes = size; | |
9dac77fa | 3962 | op->addr.mem.ea = ctxt->_eip; |
39f21ee5 AK |
3963 | /* NB. Immediates are sign-extended as necessary. */ |
3964 | switch (op->bytes) { | |
3965 | case 1: | |
e85a1085 | 3966 | op->val = insn_fetch(s8, ctxt); |
39f21ee5 AK |
3967 | break; |
3968 | case 2: | |
e85a1085 | 3969 | op->val = insn_fetch(s16, ctxt); |
39f21ee5 AK |
3970 | break; |
3971 | case 4: | |
e85a1085 | 3972 | op->val = insn_fetch(s32, ctxt); |
39f21ee5 AK |
3973 | break; |
3974 | } | |
3975 | if (!sign_extension) { | |
3976 | switch (op->bytes) { | |
3977 | case 1: | |
3978 | op->val &= 0xff; | |
3979 | break; | |
3980 | case 2: | |
3981 | op->val &= 0xffff; | |
3982 | break; | |
3983 | case 4: | |
3984 | op->val &= 0xffffffff; | |
3985 | break; | |
3986 | } | |
3987 | } | |
3988 | done: | |
3989 | return rc; | |
3990 | } | |
3991 | ||
a9945549 AK |
3992 | static int decode_operand(struct x86_emulate_ctxt *ctxt, struct operand *op, |
3993 | unsigned d) | |
3994 | { | |
3995 | int rc = X86EMUL_CONTINUE; | |
3996 | ||
3997 | switch (d) { | |
3998 | case OpReg: | |
2adb5ad9 | 3999 | decode_register_operand(ctxt, op); |
a9945549 AK |
4000 | break; |
4001 | case OpImmUByte: | |
608aabe3 | 4002 | rc = decode_imm(ctxt, op, 1, false); |
a9945549 AK |
4003 | break; |
4004 | case OpMem: | |
41ddf978 | 4005 | ctxt->memop.bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; |
0fe59128 AK |
4006 | mem_common: |
4007 | *op = ctxt->memop; | |
4008 | ctxt->memopp = op; | |
4009 | if ((ctxt->d & BitOp) && op == &ctxt->dst) | |
a9945549 AK |
4010 | fetch_bit_operand(ctxt); |
4011 | op->orig_val = op->val; | |
4012 | break; | |
41ddf978 AK |
4013 | case OpMem64: |
4014 | ctxt->memop.bytes = 8; | |
4015 | goto mem_common; | |
a9945549 AK |
4016 | case OpAcc: |
4017 | op->type = OP_REG; | |
4018 | op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; | |
dd856efa | 4019 | op->addr.reg = reg_rmw(ctxt, VCPU_REGS_RAX); |
a9945549 AK |
4020 | fetch_register_operand(op); |
4021 | op->orig_val = op->val; | |
4022 | break; | |
4023 | case OpDI: | |
4024 | op->type = OP_MEM; | |
4025 | op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; | |
4026 | op->addr.mem.ea = | |
dd856efa | 4027 | register_address(ctxt, reg_read(ctxt, VCPU_REGS_RDI)); |
a9945549 AK |
4028 | op->addr.mem.seg = VCPU_SREG_ES; |
4029 | op->val = 0; | |
b3356bf0 | 4030 | op->count = 1; |
a9945549 AK |
4031 | break; |
4032 | case OpDX: | |
4033 | op->type = OP_REG; | |
4034 | op->bytes = 2; | |
dd856efa | 4035 | op->addr.reg = reg_rmw(ctxt, VCPU_REGS_RDX); |
a9945549 AK |
4036 | fetch_register_operand(op); |
4037 | break; | |
4dd6a57d AK |
4038 | case OpCL: |
4039 | op->bytes = 1; | |
dd856efa | 4040 | op->val = reg_read(ctxt, VCPU_REGS_RCX) & 0xff; |
4dd6a57d AK |
4041 | break; |
4042 | case OpImmByte: | |
4043 | rc = decode_imm(ctxt, op, 1, true); | |
4044 | break; | |
4045 | case OpOne: | |
4046 | op->bytes = 1; | |
4047 | op->val = 1; | |
4048 | break; | |
4049 | case OpImm: | |
4050 | rc = decode_imm(ctxt, op, imm_size(ctxt), true); | |
4051 | break; | |
28867cee AK |
4052 | case OpMem8: |
4053 | ctxt->memop.bytes = 1; | |
4054 | goto mem_common; | |
0fe59128 AK |
4055 | case OpMem16: |
4056 | ctxt->memop.bytes = 2; | |
4057 | goto mem_common; | |
4058 | case OpMem32: | |
4059 | ctxt->memop.bytes = 4; | |
4060 | goto mem_common; | |
4061 | case OpImmU16: | |
4062 | rc = decode_imm(ctxt, op, 2, false); | |
4063 | break; | |
4064 | case OpImmU: | |
4065 | rc = decode_imm(ctxt, op, imm_size(ctxt), false); | |
4066 | break; | |
4067 | case OpSI: | |
4068 | op->type = OP_MEM; | |
4069 | op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; | |
4070 | op->addr.mem.ea = | |
dd856efa | 4071 | register_address(ctxt, reg_read(ctxt, VCPU_REGS_RSI)); |
0fe59128 AK |
4072 | op->addr.mem.seg = seg_override(ctxt); |
4073 | op->val = 0; | |
b3356bf0 | 4074 | op->count = 1; |
0fe59128 AK |
4075 | break; |
4076 | case OpImmFAddr: | |
4077 | op->type = OP_IMM; | |
4078 | op->addr.mem.ea = ctxt->_eip; | |
4079 | op->bytes = ctxt->op_bytes + 2; | |
4080 | insn_fetch_arr(op->valptr, op->bytes, ctxt); | |
4081 | break; | |
4082 | case OpMemFAddr: | |
4083 | ctxt->memop.bytes = ctxt->op_bytes + 2; | |
4084 | goto mem_common; | |
c191a7a0 AK |
4085 | case OpES: |
4086 | op->val = VCPU_SREG_ES; | |
4087 | break; | |
4088 | case OpCS: | |
4089 | op->val = VCPU_SREG_CS; | |
4090 | break; | |
4091 | case OpSS: | |
4092 | op->val = VCPU_SREG_SS; | |
4093 | break; | |
4094 | case OpDS: | |
4095 | op->val = VCPU_SREG_DS; | |
4096 | break; | |
4097 | case OpFS: | |
4098 | op->val = VCPU_SREG_FS; | |
4099 | break; | |
4100 | case OpGS: | |
4101 | op->val = VCPU_SREG_GS; | |
4102 | break; | |
a9945549 AK |
4103 | case OpImplicit: |
4104 | /* Special instructions do their own operand decoding. */ | |
4105 | default: | |
4106 | op->type = OP_NONE; /* Disable writeback. */ | |
4107 | break; | |
4108 | } | |
4109 | ||
4110 | done: | |
4111 | return rc; | |
4112 | } | |
4113 | ||
ef5d75cc | 4114 | int x86_decode_insn(struct x86_emulate_ctxt *ctxt, void *insn, int insn_len) |
dde7e6d1 | 4115 | { |
dde7e6d1 AK |
4116 | int rc = X86EMUL_CONTINUE; |
4117 | int mode = ctxt->mode; | |
46561646 | 4118 | int def_op_bytes, def_ad_bytes, goffset, simd_prefix; |
0d7cdee8 | 4119 | bool op_prefix = false; |
46561646 | 4120 | struct opcode opcode; |
dde7e6d1 | 4121 | |
f09ed83e AK |
4122 | ctxt->memop.type = OP_NONE; |
4123 | ctxt->memopp = NULL; | |
9dac77fa AK |
4124 | ctxt->_eip = ctxt->eip; |
4125 | ctxt->fetch.start = ctxt->_eip; | |
4126 | ctxt->fetch.end = ctxt->fetch.start + insn_len; | |
dc25e89e | 4127 | if (insn_len > 0) |
9dac77fa | 4128 | memcpy(ctxt->fetch.data, insn, insn_len); |
dde7e6d1 AK |
4129 | |
4130 | switch (mode) { | |
4131 | case X86EMUL_MODE_REAL: | |
4132 | case X86EMUL_MODE_VM86: | |
4133 | case X86EMUL_MODE_PROT16: | |
4134 | def_op_bytes = def_ad_bytes = 2; | |
4135 | break; | |
4136 | case X86EMUL_MODE_PROT32: | |
4137 | def_op_bytes = def_ad_bytes = 4; | |
4138 | break; | |
4139 | #ifdef CONFIG_X86_64 | |
4140 | case X86EMUL_MODE_PROT64: | |
4141 | def_op_bytes = 4; | |
4142 | def_ad_bytes = 8; | |
4143 | break; | |
4144 | #endif | |
4145 | default: | |
1d2887e2 | 4146 | return EMULATION_FAILED; |
dde7e6d1 AK |
4147 | } |
4148 | ||
9dac77fa AK |
4149 | ctxt->op_bytes = def_op_bytes; |
4150 | ctxt->ad_bytes = def_ad_bytes; | |
dde7e6d1 AK |
4151 | |
4152 | /* Legacy prefixes. */ | |
4153 | for (;;) { | |
e85a1085 | 4154 | switch (ctxt->b = insn_fetch(u8, ctxt)) { |
dde7e6d1 | 4155 | case 0x66: /* operand-size override */ |
0d7cdee8 | 4156 | op_prefix = true; |
dde7e6d1 | 4157 | /* switch between 2/4 bytes */ |
9dac77fa | 4158 | ctxt->op_bytes = def_op_bytes ^ 6; |
dde7e6d1 AK |
4159 | break; |
4160 | case 0x67: /* address-size override */ | |
4161 | if (mode == X86EMUL_MODE_PROT64) | |
4162 | /* switch between 4/8 bytes */ | |
9dac77fa | 4163 | ctxt->ad_bytes = def_ad_bytes ^ 12; |
dde7e6d1 AK |
4164 | else |
4165 | /* switch between 2/4 bytes */ | |
9dac77fa | 4166 | ctxt->ad_bytes = def_ad_bytes ^ 6; |
dde7e6d1 AK |
4167 | break; |
4168 | case 0x26: /* ES override */ | |
4169 | case 0x2e: /* CS override */ | |
4170 | case 0x36: /* SS override */ | |
4171 | case 0x3e: /* DS override */ | |
9dac77fa | 4172 | set_seg_override(ctxt, (ctxt->b >> 3) & 3); |
dde7e6d1 AK |
4173 | break; |
4174 | case 0x64: /* FS override */ | |
4175 | case 0x65: /* GS override */ | |
9dac77fa | 4176 | set_seg_override(ctxt, ctxt->b & 7); |
dde7e6d1 AK |
4177 | break; |
4178 | case 0x40 ... 0x4f: /* REX */ | |
4179 | if (mode != X86EMUL_MODE_PROT64) | |
4180 | goto done_prefixes; | |
9dac77fa | 4181 | ctxt->rex_prefix = ctxt->b; |
dde7e6d1 AK |
4182 | continue; |
4183 | case 0xf0: /* LOCK */ | |
9dac77fa | 4184 | ctxt->lock_prefix = 1; |
dde7e6d1 AK |
4185 | break; |
4186 | case 0xf2: /* REPNE/REPNZ */ | |
dde7e6d1 | 4187 | case 0xf3: /* REP/REPE/REPZ */ |
9dac77fa | 4188 | ctxt->rep_prefix = ctxt->b; |
dde7e6d1 AK |
4189 | break; |
4190 | default: | |
4191 | goto done_prefixes; | |
4192 | } | |
4193 | ||
4194 | /* Any legacy prefix after a REX prefix nullifies its effect. */ | |
4195 | ||
9dac77fa | 4196 | ctxt->rex_prefix = 0; |
dde7e6d1 AK |
4197 | } |
4198 | ||
4199 | done_prefixes: | |
4200 | ||
4201 | /* REX prefix. */ | |
9dac77fa AK |
4202 | if (ctxt->rex_prefix & 8) |
4203 | ctxt->op_bytes = 8; /* REX.W */ | |
dde7e6d1 AK |
4204 | |
4205 | /* Opcode byte(s). */ | |
9dac77fa | 4206 | opcode = opcode_table[ctxt->b]; |
d3ad6243 | 4207 | /* Two-byte opcode? */ |
9dac77fa AK |
4208 | if (ctxt->b == 0x0f) { |
4209 | ctxt->twobyte = 1; | |
e85a1085 | 4210 | ctxt->b = insn_fetch(u8, ctxt); |
9dac77fa | 4211 | opcode = twobyte_table[ctxt->b]; |
dde7e6d1 | 4212 | } |
9dac77fa | 4213 | ctxt->d = opcode.flags; |
dde7e6d1 | 4214 | |
9f4260e7 TY |
4215 | if (ctxt->d & ModRM) |
4216 | ctxt->modrm = insn_fetch(u8, ctxt); | |
4217 | ||
9dac77fa AK |
4218 | while (ctxt->d & GroupMask) { |
4219 | switch (ctxt->d & GroupMask) { | |
46561646 | 4220 | case Group: |
9dac77fa | 4221 | goffset = (ctxt->modrm >> 3) & 7; |
46561646 AK |
4222 | opcode = opcode.u.group[goffset]; |
4223 | break; | |
4224 | case GroupDual: | |
9dac77fa AK |
4225 | goffset = (ctxt->modrm >> 3) & 7; |
4226 | if ((ctxt->modrm >> 6) == 3) | |
46561646 AK |
4227 | opcode = opcode.u.gdual->mod3[goffset]; |
4228 | else | |
4229 | opcode = opcode.u.gdual->mod012[goffset]; | |
4230 | break; | |
4231 | case RMExt: | |
9dac77fa | 4232 | goffset = ctxt->modrm & 7; |
01de8b09 | 4233 | opcode = opcode.u.group[goffset]; |
46561646 AK |
4234 | break; |
4235 | case Prefix: | |
9dac77fa | 4236 | if (ctxt->rep_prefix && op_prefix) |
1d2887e2 | 4237 | return EMULATION_FAILED; |
9dac77fa | 4238 | simd_prefix = op_prefix ? 0x66 : ctxt->rep_prefix; |
46561646 AK |
4239 | switch (simd_prefix) { |
4240 | case 0x00: opcode = opcode.u.gprefix->pfx_no; break; | |
4241 | case 0x66: opcode = opcode.u.gprefix->pfx_66; break; | |
4242 | case 0xf2: opcode = opcode.u.gprefix->pfx_f2; break; | |
4243 | case 0xf3: opcode = opcode.u.gprefix->pfx_f3; break; | |
4244 | } | |
4245 | break; | |
4246 | default: | |
1d2887e2 | 4247 | return EMULATION_FAILED; |
0d7cdee8 | 4248 | } |
46561646 | 4249 | |
b1ea50b2 | 4250 | ctxt->d &= ~(u64)GroupMask; |
9dac77fa | 4251 | ctxt->d |= opcode.flags; |
0d7cdee8 AK |
4252 | } |
4253 | ||
9dac77fa AK |
4254 | ctxt->execute = opcode.u.execute; |
4255 | ctxt->check_perm = opcode.check_perm; | |
4256 | ctxt->intercept = opcode.intercept; | |
dde7e6d1 AK |
4257 | |
4258 | /* Unrecognised? */ | |
9dac77fa | 4259 | if (ctxt->d == 0 || (ctxt->d & Undefined)) |
1d2887e2 | 4260 | return EMULATION_FAILED; |
dde7e6d1 | 4261 | |
9dac77fa | 4262 | if (!(ctxt->d & VendorSpecific) && ctxt->only_vendor_specific_insn) |
1d2887e2 | 4263 | return EMULATION_FAILED; |
d867162c | 4264 | |
9dac77fa AK |
4265 | if (mode == X86EMUL_MODE_PROT64 && (ctxt->d & Stack)) |
4266 | ctxt->op_bytes = 8; | |
dde7e6d1 | 4267 | |
9dac77fa | 4268 | if (ctxt->d & Op3264) { |
7f9b4b75 | 4269 | if (mode == X86EMUL_MODE_PROT64) |
9dac77fa | 4270 | ctxt->op_bytes = 8; |
7f9b4b75 | 4271 | else |
9dac77fa | 4272 | ctxt->op_bytes = 4; |
7f9b4b75 AK |
4273 | } |
4274 | ||
9dac77fa AK |
4275 | if (ctxt->d & Sse) |
4276 | ctxt->op_bytes = 16; | |
cbe2c9d3 AK |
4277 | else if (ctxt->d & Mmx) |
4278 | ctxt->op_bytes = 8; | |
1253791d | 4279 | |
dde7e6d1 | 4280 | /* ModRM and SIB bytes. */ |
9dac77fa | 4281 | if (ctxt->d & ModRM) { |
f09ed83e | 4282 | rc = decode_modrm(ctxt, &ctxt->memop); |
9dac77fa AK |
4283 | if (!ctxt->has_seg_override) |
4284 | set_seg_override(ctxt, ctxt->modrm_seg); | |
4285 | } else if (ctxt->d & MemAbs) | |
f09ed83e | 4286 | rc = decode_abs(ctxt, &ctxt->memop); |
dde7e6d1 AK |
4287 | if (rc != X86EMUL_CONTINUE) |
4288 | goto done; | |
4289 | ||
9dac77fa AK |
4290 | if (!ctxt->has_seg_override) |
4291 | set_seg_override(ctxt, VCPU_SREG_DS); | |
dde7e6d1 | 4292 | |
f09ed83e | 4293 | ctxt->memop.addr.mem.seg = seg_override(ctxt); |
dde7e6d1 | 4294 | |
f09ed83e AK |
4295 | if (ctxt->memop.type == OP_MEM && ctxt->ad_bytes != 8) |
4296 | ctxt->memop.addr.mem.ea = (u32)ctxt->memop.addr.mem.ea; | |
dde7e6d1 | 4297 | |
dde7e6d1 AK |
4298 | /* |
4299 | * Decode and fetch the source operand: register, memory | |
4300 | * or immediate. | |
4301 | */ | |
0fe59128 | 4302 | rc = decode_operand(ctxt, &ctxt->src, (ctxt->d >> SrcShift) & OpMask); |
39f21ee5 AK |
4303 | if (rc != X86EMUL_CONTINUE) |
4304 | goto done; | |
4305 | ||
dde7e6d1 AK |
4306 | /* |
4307 | * Decode and fetch the second source operand: register, memory | |
4308 | * or immediate. | |
4309 | */ | |
4dd6a57d | 4310 | rc = decode_operand(ctxt, &ctxt->src2, (ctxt->d >> Src2Shift) & OpMask); |
39f21ee5 AK |
4311 | if (rc != X86EMUL_CONTINUE) |
4312 | goto done; | |
4313 | ||
dde7e6d1 | 4314 | /* Decode and fetch the destination operand: register or memory. */ |
a9945549 | 4315 | rc = decode_operand(ctxt, &ctxt->dst, (ctxt->d >> DstShift) & OpMask); |
dde7e6d1 AK |
4316 | |
4317 | done: | |
f09ed83e AK |
4318 | if (ctxt->memopp && ctxt->memopp->type == OP_MEM && ctxt->rip_relative) |
4319 | ctxt->memopp->addr.mem.ea += ctxt->_eip; | |
cb16c348 | 4320 | |
1d2887e2 | 4321 | return (rc != X86EMUL_CONTINUE) ? EMULATION_FAILED : EMULATION_OK; |
dde7e6d1 AK |
4322 | } |
4323 | ||
1cb3f3ae XG |
4324 | bool x86_page_table_writing_insn(struct x86_emulate_ctxt *ctxt) |
4325 | { | |
4326 | return ctxt->d & PageTable; | |
4327 | } | |
4328 | ||
3e2f65d5 GN |
4329 | static bool string_insn_completed(struct x86_emulate_ctxt *ctxt) |
4330 | { | |
3e2f65d5 GN |
4331 | /* The second termination condition only applies for REPE |
4332 | * and REPNE. Test if the repeat string operation prefix is | |
4333 | * REPE/REPZ or REPNE/REPNZ and if it's the case it tests the | |
4334 | * corresponding termination condition according to: | |
4335 | * - if REPE/REPZ and ZF = 0 then done | |
4336 | * - if REPNE/REPNZ and ZF = 1 then done | |
4337 | */ | |
9dac77fa AK |
4338 | if (((ctxt->b == 0xa6) || (ctxt->b == 0xa7) || |
4339 | (ctxt->b == 0xae) || (ctxt->b == 0xaf)) | |
4340 | && (((ctxt->rep_prefix == REPE_PREFIX) && | |
3e2f65d5 | 4341 | ((ctxt->eflags & EFLG_ZF) == 0)) |
9dac77fa | 4342 | || ((ctxt->rep_prefix == REPNE_PREFIX) && |
3e2f65d5 GN |
4343 | ((ctxt->eflags & EFLG_ZF) == EFLG_ZF)))) |
4344 | return true; | |
4345 | ||
4346 | return false; | |
4347 | } | |
4348 | ||
cbe2c9d3 AK |
4349 | static int flush_pending_x87_faults(struct x86_emulate_ctxt *ctxt) |
4350 | { | |
4351 | bool fault = false; | |
4352 | ||
4353 | ctxt->ops->get_fpu(ctxt); | |
4354 | asm volatile("1: fwait \n\t" | |
4355 | "2: \n\t" | |
4356 | ".pushsection .fixup,\"ax\" \n\t" | |
4357 | "3: \n\t" | |
4358 | "movb $1, %[fault] \n\t" | |
4359 | "jmp 2b \n\t" | |
4360 | ".popsection \n\t" | |
4361 | _ASM_EXTABLE(1b, 3b) | |
38e8a2dd | 4362 | : [fault]"+qm"(fault)); |
cbe2c9d3 AK |
4363 | ctxt->ops->put_fpu(ctxt); |
4364 | ||
4365 | if (unlikely(fault)) | |
4366 | return emulate_exception(ctxt, MF_VECTOR, 0, false); | |
4367 | ||
4368 | return X86EMUL_CONTINUE; | |
4369 | } | |
4370 | ||
4371 | static void fetch_possible_mmx_operand(struct x86_emulate_ctxt *ctxt, | |
4372 | struct operand *op) | |
4373 | { | |
4374 | if (op->type == OP_MM) | |
4375 | read_mmx_reg(ctxt, &op->mm_val, op->addr.mm); | |
4376 | } | |
4377 | ||
dd856efa | 4378 | |
7b105ca2 | 4379 | int x86_emulate_insn(struct x86_emulate_ctxt *ctxt) |
8b4caf66 | 4380 | { |
0225fb50 | 4381 | const struct x86_emulate_ops *ops = ctxt->ops; |
1b30eaa8 | 4382 | int rc = X86EMUL_CONTINUE; |
9dac77fa | 4383 | int saved_dst_type = ctxt->dst.type; |
8b4caf66 | 4384 | |
9dac77fa | 4385 | ctxt->mem_read.pos = 0; |
310b5d30 | 4386 | |
9dac77fa | 4387 | if (ctxt->mode == X86EMUL_MODE_PROT64 && (ctxt->d & No64)) { |
35d3d4a1 | 4388 | rc = emulate_ud(ctxt); |
1161624f GN |
4389 | goto done; |
4390 | } | |
4391 | ||
d380a5e4 | 4392 | /* LOCK prefix is allowed only with some instructions */ |
9dac77fa | 4393 | if (ctxt->lock_prefix && (!(ctxt->d & Lock) || ctxt->dst.type != OP_MEM)) { |
35d3d4a1 | 4394 | rc = emulate_ud(ctxt); |
d380a5e4 GN |
4395 | goto done; |
4396 | } | |
4397 | ||
9dac77fa | 4398 | if ((ctxt->d & SrcMask) == SrcMemFAddr && ctxt->src.type != OP_MEM) { |
35d3d4a1 | 4399 | rc = emulate_ud(ctxt); |
081bca0e AK |
4400 | goto done; |
4401 | } | |
4402 | ||
cbe2c9d3 AK |
4403 | if (((ctxt->d & (Sse|Mmx)) && ((ops->get_cr(ctxt, 0) & X86_CR0_EM))) |
4404 | || ((ctxt->d & Sse) && !(ops->get_cr(ctxt, 4) & X86_CR4_OSFXSR))) { | |
1253791d AK |
4405 | rc = emulate_ud(ctxt); |
4406 | goto done; | |
4407 | } | |
4408 | ||
cbe2c9d3 | 4409 | if ((ctxt->d & (Sse|Mmx)) && (ops->get_cr(ctxt, 0) & X86_CR0_TS)) { |
1253791d AK |
4410 | rc = emulate_nm(ctxt); |
4411 | goto done; | |
4412 | } | |
4413 | ||
cbe2c9d3 AK |
4414 | if (ctxt->d & Mmx) { |
4415 | rc = flush_pending_x87_faults(ctxt); | |
4416 | if (rc != X86EMUL_CONTINUE) | |
4417 | goto done; | |
4418 | /* | |
4419 | * Now that we know the fpu is exception safe, we can fetch | |
4420 | * operands from it. | |
4421 | */ | |
4422 | fetch_possible_mmx_operand(ctxt, &ctxt->src); | |
4423 | fetch_possible_mmx_operand(ctxt, &ctxt->src2); | |
4424 | if (!(ctxt->d & Mov)) | |
4425 | fetch_possible_mmx_operand(ctxt, &ctxt->dst); | |
4426 | } | |
4427 | ||
9dac77fa AK |
4428 | if (unlikely(ctxt->guest_mode) && ctxt->intercept) { |
4429 | rc = emulator_check_intercept(ctxt, ctxt->intercept, | |
8a76d7f2 | 4430 | X86_ICPT_PRE_EXCEPT); |
c4f035c6 AK |
4431 | if (rc != X86EMUL_CONTINUE) |
4432 | goto done; | |
4433 | } | |
4434 | ||
e92805ac | 4435 | /* Privileged instruction can be executed only in CPL=0 */ |
9dac77fa | 4436 | if ((ctxt->d & Priv) && ops->cpl(ctxt)) { |
35d3d4a1 | 4437 | rc = emulate_gp(ctxt, 0); |
e92805ac GN |
4438 | goto done; |
4439 | } | |
4440 | ||
8ea7d6ae | 4441 | /* Instruction can only be executed in protected mode */ |
9d1b39a9 | 4442 | if ((ctxt->d & Prot) && ctxt->mode < X86EMUL_MODE_PROT16) { |
8ea7d6ae JR |
4443 | rc = emulate_ud(ctxt); |
4444 | goto done; | |
4445 | } | |
4446 | ||
d09beabd | 4447 | /* Do instruction specific permission checks */ |
9dac77fa AK |
4448 | if (ctxt->check_perm) { |
4449 | rc = ctxt->check_perm(ctxt); | |
d09beabd JR |
4450 | if (rc != X86EMUL_CONTINUE) |
4451 | goto done; | |
4452 | } | |
4453 | ||
9dac77fa AK |
4454 | if (unlikely(ctxt->guest_mode) && ctxt->intercept) { |
4455 | rc = emulator_check_intercept(ctxt, ctxt->intercept, | |
8a76d7f2 | 4456 | X86_ICPT_POST_EXCEPT); |
c4f035c6 AK |
4457 | if (rc != X86EMUL_CONTINUE) |
4458 | goto done; | |
4459 | } | |
4460 | ||
9dac77fa | 4461 | if (ctxt->rep_prefix && (ctxt->d & String)) { |
b9fa9d6b | 4462 | /* All REP prefixes have the same first termination condition */ |
dd856efa | 4463 | if (address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) == 0) { |
9dac77fa | 4464 | ctxt->eip = ctxt->_eip; |
b9fa9d6b AK |
4465 | goto done; |
4466 | } | |
b9fa9d6b AK |
4467 | } |
4468 | ||
9dac77fa AK |
4469 | if ((ctxt->src.type == OP_MEM) && !(ctxt->d & NoAccess)) { |
4470 | rc = segmented_read(ctxt, ctxt->src.addr.mem, | |
4471 | ctxt->src.valptr, ctxt->src.bytes); | |
b60d513c | 4472 | if (rc != X86EMUL_CONTINUE) |
8b4caf66 | 4473 | goto done; |
9dac77fa | 4474 | ctxt->src.orig_val64 = ctxt->src.val64; |
8b4caf66 LV |
4475 | } |
4476 | ||
9dac77fa AK |
4477 | if (ctxt->src2.type == OP_MEM) { |
4478 | rc = segmented_read(ctxt, ctxt->src2.addr.mem, | |
4479 | &ctxt->src2.val, ctxt->src2.bytes); | |
e35b7b9c GN |
4480 | if (rc != X86EMUL_CONTINUE) |
4481 | goto done; | |
4482 | } | |
4483 | ||
9dac77fa | 4484 | if ((ctxt->d & DstMask) == ImplicitOps) |
8b4caf66 LV |
4485 | goto special_insn; |
4486 | ||
4487 | ||
9dac77fa | 4488 | if ((ctxt->dst.type == OP_MEM) && !(ctxt->d & Mov)) { |
69f55cb1 | 4489 | /* optimisation - avoid slow emulated read if Mov */ |
9dac77fa AK |
4490 | rc = segmented_read(ctxt, ctxt->dst.addr.mem, |
4491 | &ctxt->dst.val, ctxt->dst.bytes); | |
69f55cb1 GN |
4492 | if (rc != X86EMUL_CONTINUE) |
4493 | goto done; | |
038e51de | 4494 | } |
9dac77fa | 4495 | ctxt->dst.orig_val = ctxt->dst.val; |
038e51de | 4496 | |
018a98db AK |
4497 | special_insn: |
4498 | ||
9dac77fa AK |
4499 | if (unlikely(ctxt->guest_mode) && ctxt->intercept) { |
4500 | rc = emulator_check_intercept(ctxt, ctxt->intercept, | |
8a76d7f2 | 4501 | X86_ICPT_POST_MEMACCESS); |
c4f035c6 AK |
4502 | if (rc != X86EMUL_CONTINUE) |
4503 | goto done; | |
4504 | } | |
4505 | ||
9dac77fa AK |
4506 | if (ctxt->execute) { |
4507 | rc = ctxt->execute(ctxt); | |
ef65c889 AK |
4508 | if (rc != X86EMUL_CONTINUE) |
4509 | goto done; | |
4510 | goto writeback; | |
4511 | } | |
4512 | ||
9dac77fa | 4513 | if (ctxt->twobyte) |
6aa8b732 AK |
4514 | goto twobyte_insn; |
4515 | ||
9dac77fa | 4516 | switch (ctxt->b) { |
33615aa9 | 4517 | case 0x40 ... 0x47: /* inc r16/r32 */ |
d1eef45d | 4518 | emulate_1op(ctxt, "inc"); |
33615aa9 AK |
4519 | break; |
4520 | case 0x48 ... 0x4f: /* dec r16/r32 */ | |
d1eef45d | 4521 | emulate_1op(ctxt, "dec"); |
33615aa9 | 4522 | break; |
6aa8b732 | 4523 | case 0x63: /* movsxd */ |
8b4caf66 | 4524 | if (ctxt->mode != X86EMUL_MODE_PROT64) |
6aa8b732 | 4525 | goto cannot_emulate; |
9dac77fa | 4526 | ctxt->dst.val = (s32) ctxt->src.val; |
6aa8b732 | 4527 | break; |
b2833e3c | 4528 | case 0x70 ... 0x7f: /* jcc (short) */ |
9dac77fa AK |
4529 | if (test_cc(ctxt->b, ctxt->eflags)) |
4530 | jmp_rel(ctxt, ctxt->src.val); | |
018a98db | 4531 | break; |
7e0b54b1 | 4532 | case 0x8d: /* lea r16/r32, m */ |
9dac77fa | 4533 | ctxt->dst.val = ctxt->src.addr.mem.ea; |
7e0b54b1 | 4534 | break; |
3d9e77df | 4535 | case 0x90 ... 0x97: /* nop / xchg reg, rax */ |
dd856efa | 4536 | if (ctxt->dst.addr.reg == reg_rmw(ctxt, VCPU_REGS_RAX)) |
34698d8c | 4537 | break; |
e4f973ae TY |
4538 | rc = em_xchg(ctxt); |
4539 | break; | |
e8b6fa70 | 4540 | case 0x98: /* cbw/cwde/cdqe */ |
9dac77fa AK |
4541 | switch (ctxt->op_bytes) { |
4542 | case 2: ctxt->dst.val = (s8)ctxt->dst.val; break; | |
4543 | case 4: ctxt->dst.val = (s16)ctxt->dst.val; break; | |
4544 | case 8: ctxt->dst.val = (s32)ctxt->dst.val; break; | |
e8b6fa70 WY |
4545 | } |
4546 | break; | |
018a98db | 4547 | case 0xc0 ... 0xc1: |
51187683 | 4548 | rc = em_grp2(ctxt); |
018a98db | 4549 | break; |
6e154e56 | 4550 | case 0xcc: /* int3 */ |
5c5df76b TY |
4551 | rc = emulate_int(ctxt, 3); |
4552 | break; | |
6e154e56 | 4553 | case 0xcd: /* int n */ |
9dac77fa | 4554 | rc = emulate_int(ctxt, ctxt->src.val); |
6e154e56 MG |
4555 | break; |
4556 | case 0xce: /* into */ | |
5c5df76b TY |
4557 | if (ctxt->eflags & EFLG_OF) |
4558 | rc = emulate_int(ctxt, 4); | |
6e154e56 | 4559 | break; |
018a98db | 4560 | case 0xd0 ... 0xd1: /* Grp2 */ |
51187683 | 4561 | rc = em_grp2(ctxt); |
018a98db AK |
4562 | break; |
4563 | case 0xd2 ... 0xd3: /* Grp2 */ | |
dd856efa | 4564 | ctxt->src.val = reg_read(ctxt, VCPU_REGS_RCX); |
51187683 | 4565 | rc = em_grp2(ctxt); |
018a98db | 4566 | break; |
1a52e051 | 4567 | case 0xe9: /* jmp rel */ |
db5b0762 | 4568 | case 0xeb: /* jmp rel short */ |
9dac77fa AK |
4569 | jmp_rel(ctxt, ctxt->src.val); |
4570 | ctxt->dst.type = OP_NONE; /* Disable writeback. */ | |
1a52e051 | 4571 | break; |
111de5d6 | 4572 | case 0xf4: /* hlt */ |
6c3287f7 | 4573 | ctxt->ops->halt(ctxt); |
19fdfa0d | 4574 | break; |
111de5d6 AK |
4575 | case 0xf5: /* cmc */ |
4576 | /* complement carry flag from eflags reg */ | |
4577 | ctxt->eflags ^= EFLG_CF; | |
111de5d6 AK |
4578 | break; |
4579 | case 0xf8: /* clc */ | |
4580 | ctxt->eflags &= ~EFLG_CF; | |
111de5d6 | 4581 | break; |
8744aa9a MG |
4582 | case 0xf9: /* stc */ |
4583 | ctxt->eflags |= EFLG_CF; | |
4584 | break; | |
fb4616f4 MG |
4585 | case 0xfc: /* cld */ |
4586 | ctxt->eflags &= ~EFLG_DF; | |
fb4616f4 MG |
4587 | break; |
4588 | case 0xfd: /* std */ | |
4589 | ctxt->eflags |= EFLG_DF; | |
fb4616f4 | 4590 | break; |
91269b8f AK |
4591 | default: |
4592 | goto cannot_emulate; | |
6aa8b732 | 4593 | } |
018a98db | 4594 | |
7d9ddaed AK |
4595 | if (rc != X86EMUL_CONTINUE) |
4596 | goto done; | |
4597 | ||
018a98db | 4598 | writeback: |
adddcecf | 4599 | rc = writeback(ctxt); |
1b30eaa8 | 4600 | if (rc != X86EMUL_CONTINUE) |
018a98db AK |
4601 | goto done; |
4602 | ||
5cd21917 GN |
4603 | /* |
4604 | * restore dst type in case the decoding will be reused | |
4605 | * (happens for string instruction ) | |
4606 | */ | |
9dac77fa | 4607 | ctxt->dst.type = saved_dst_type; |
5cd21917 | 4608 | |
9dac77fa | 4609 | if ((ctxt->d & SrcMask) == SrcSI) |
f3bd64c6 | 4610 | string_addr_inc(ctxt, VCPU_REGS_RSI, &ctxt->src); |
a682e354 | 4611 | |
9dac77fa | 4612 | if ((ctxt->d & DstMask) == DstDI) |
f3bd64c6 | 4613 | string_addr_inc(ctxt, VCPU_REGS_RDI, &ctxt->dst); |
d9271123 | 4614 | |
9dac77fa | 4615 | if (ctxt->rep_prefix && (ctxt->d & String)) { |
b3356bf0 | 4616 | unsigned int count; |
9dac77fa | 4617 | struct read_cache *r = &ctxt->io_read; |
b3356bf0 GN |
4618 | if ((ctxt->d & SrcMask) == SrcSI) |
4619 | count = ctxt->src.count; | |
4620 | else | |
4621 | count = ctxt->dst.count; | |
4622 | register_address_increment(ctxt, reg_rmw(ctxt, VCPU_REGS_RCX), | |
4623 | -count); | |
3e2f65d5 | 4624 | |
d2ddd1c4 GN |
4625 | if (!string_insn_completed(ctxt)) { |
4626 | /* | |
4627 | * Re-enter guest when pio read ahead buffer is empty | |
4628 | * or, if it is not used, after each 1024 iteration. | |
4629 | */ | |
dd856efa | 4630 | if ((r->end != 0 || reg_read(ctxt, VCPU_REGS_RCX) & 0x3ff) && |
d2ddd1c4 GN |
4631 | (r->end == 0 || r->end != r->pos)) { |
4632 | /* | |
4633 | * Reset read cache. Usually happens before | |
4634 | * decode, but since instruction is restarted | |
4635 | * we have to do it here. | |
4636 | */ | |
9dac77fa | 4637 | ctxt->mem_read.end = 0; |
dd856efa | 4638 | writeback_registers(ctxt); |
d2ddd1c4 GN |
4639 | return EMULATION_RESTART; |
4640 | } | |
4641 | goto done; /* skip rip writeback */ | |
0fa6ccbd | 4642 | } |
5cd21917 | 4643 | } |
d2ddd1c4 | 4644 | |
9dac77fa | 4645 | ctxt->eip = ctxt->_eip; |
018a98db AK |
4646 | |
4647 | done: | |
da9cb575 AK |
4648 | if (rc == X86EMUL_PROPAGATE_FAULT) |
4649 | ctxt->have_exception = true; | |
775fde86 JR |
4650 | if (rc == X86EMUL_INTERCEPTED) |
4651 | return EMULATION_INTERCEPTED; | |
4652 | ||
dd856efa AK |
4653 | if (rc == X86EMUL_CONTINUE) |
4654 | writeback_registers(ctxt); | |
4655 | ||
d2ddd1c4 | 4656 | return (rc == X86EMUL_UNHANDLEABLE) ? EMULATION_FAILED : EMULATION_OK; |
6aa8b732 AK |
4657 | |
4658 | twobyte_insn: | |
9dac77fa | 4659 | switch (ctxt->b) { |
018a98db | 4660 | case 0x09: /* wbinvd */ |
cfb22375 | 4661 | (ctxt->ops->wbinvd)(ctxt); |
f5f48ee1 SY |
4662 | break; |
4663 | case 0x08: /* invd */ | |
018a98db AK |
4664 | case 0x0d: /* GrpP (prefetch) */ |
4665 | case 0x18: /* Grp16 (prefetch/nop) */ | |
018a98db AK |
4666 | break; |
4667 | case 0x20: /* mov cr, reg */ | |
9dac77fa | 4668 | ctxt->dst.val = ops->get_cr(ctxt, ctxt->modrm_reg); |
018a98db | 4669 | break; |
6aa8b732 | 4670 | case 0x21: /* mov from dr to reg */ |
9dac77fa | 4671 | ops->get_dr(ctxt, ctxt->modrm_reg, &ctxt->dst.val); |
6aa8b732 | 4672 | break; |
6aa8b732 | 4673 | case 0x40 ... 0x4f: /* cmov */ |
9dac77fa AK |
4674 | ctxt->dst.val = ctxt->dst.orig_val = ctxt->src.val; |
4675 | if (!test_cc(ctxt->b, ctxt->eflags)) | |
4676 | ctxt->dst.type = OP_NONE; /* no writeback */ | |
6aa8b732 | 4677 | break; |
b2833e3c | 4678 | case 0x80 ... 0x8f: /* jnz rel, etc*/ |
9dac77fa AK |
4679 | if (test_cc(ctxt->b, ctxt->eflags)) |
4680 | jmp_rel(ctxt, ctxt->src.val); | |
018a98db | 4681 | break; |
ee45b58e | 4682 | case 0x90 ... 0x9f: /* setcc r/m8 */ |
9dac77fa | 4683 | ctxt->dst.val = test_cc(ctxt->b, ctxt->eflags); |
ee45b58e | 4684 | break; |
9bf8ea42 GT |
4685 | case 0xa4: /* shld imm8, r, r/m */ |
4686 | case 0xa5: /* shld cl, r, r/m */ | |
761441b9 | 4687 | emulate_2op_cl(ctxt, "shld"); |
9bf8ea42 | 4688 | break; |
9bf8ea42 GT |
4689 | case 0xac: /* shrd imm8, r, r/m */ |
4690 | case 0xad: /* shrd cl, r, r/m */ | |
761441b9 | 4691 | emulate_2op_cl(ctxt, "shrd"); |
9bf8ea42 | 4692 | break; |
2a7c5b8b GC |
4693 | case 0xae: /* clflush */ |
4694 | break; | |
6aa8b732 | 4695 | case 0xb6 ... 0xb7: /* movzx */ |
9dac77fa | 4696 | ctxt->dst.bytes = ctxt->op_bytes; |
361cad2b | 4697 | ctxt->dst.val = (ctxt->src.bytes == 1) ? (u8) ctxt->src.val |
9dac77fa | 4698 | : (u16) ctxt->src.val; |
6aa8b732 | 4699 | break; |
6aa8b732 | 4700 | case 0xbe ... 0xbf: /* movsx */ |
9dac77fa | 4701 | ctxt->dst.bytes = ctxt->op_bytes; |
361cad2b | 4702 | ctxt->dst.val = (ctxt->src.bytes == 1) ? (s8) ctxt->src.val : |
9dac77fa | 4703 | (s16) ctxt->src.val; |
6aa8b732 | 4704 | break; |
92f738a5 | 4705 | case 0xc0 ... 0xc1: /* xadd */ |
a31b9cea | 4706 | emulate_2op_SrcV(ctxt, "add"); |
92f738a5 | 4707 | /* Write back the register source. */ |
9dac77fa AK |
4708 | ctxt->src.val = ctxt->dst.orig_val; |
4709 | write_register_operand(&ctxt->src); | |
92f738a5 | 4710 | break; |
a012e65a | 4711 | case 0xc3: /* movnti */ |
9dac77fa AK |
4712 | ctxt->dst.bytes = ctxt->op_bytes; |
4713 | ctxt->dst.val = (ctxt->op_bytes == 4) ? (u32) ctxt->src.val : | |
4714 | (u64) ctxt->src.val; | |
a012e65a | 4715 | break; |
91269b8f AK |
4716 | default: |
4717 | goto cannot_emulate; | |
6aa8b732 | 4718 | } |
7d9ddaed AK |
4719 | |
4720 | if (rc != X86EMUL_CONTINUE) | |
4721 | goto done; | |
4722 | ||
6aa8b732 AK |
4723 | goto writeback; |
4724 | ||
4725 | cannot_emulate: | |
a0c0ab2f | 4726 | return EMULATION_FAILED; |
6aa8b732 | 4727 | } |
dd856efa AK |
4728 | |
4729 | void emulator_invalidate_register_cache(struct x86_emulate_ctxt *ctxt) | |
4730 | { | |
4731 | invalidate_registers(ctxt); | |
4732 | } | |
4733 | ||
4734 | void emulator_writeback_register_cache(struct x86_emulate_ctxt *ctxt) | |
4735 | { | |
4736 | writeback_registers(ctxt); | |
4737 | } |