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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); |
120df890 AK |
164 | struct opcode *group; |
165 | struct group_dual *gdual; | |
0d7cdee8 | 166 | struct gprefix *gprefix; |
120df890 | 167 | } u; |
d09beabd | 168 | int (*check_perm)(struct x86_emulate_ctxt *ctxt); |
120df890 AK |
169 | }; |
170 | ||
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) \ | |
429 | : "i" (EFLAGS_MASK), "m" ((ctxt)->src.val), \ | |
430 | "a" (*rax), "d" (*rdx)); \ | |
f6b3597b AK |
431 | } while (0) |
432 | ||
3f9f53b0 | 433 | /* instruction has only one source operand, destination is implicit (e.g. mul, div, imul, idiv) */ |
e8f2b1d6 | 434 | #define emulate_1op_rax_rdx(ctxt, _op, _ex) \ |
7295261c | 435 | do { \ |
e8f2b1d6 | 436 | switch((ctxt)->src.bytes) { \ |
7295261c | 437 | case 1: \ |
e8f2b1d6 | 438 | __emulate_1op_rax_rdx(ctxt, _op, "b", _ex); \ |
7295261c AK |
439 | break; \ |
440 | case 2: \ | |
e8f2b1d6 | 441 | __emulate_1op_rax_rdx(ctxt, _op, "w", _ex); \ |
7295261c AK |
442 | break; \ |
443 | case 4: \ | |
e8f2b1d6 | 444 | __emulate_1op_rax_rdx(ctxt, _op, "l", _ex); \ |
f6b3597b AK |
445 | break; \ |
446 | case 8: ON64( \ | |
e8f2b1d6 | 447 | __emulate_1op_rax_rdx(ctxt, _op, "q", _ex)); \ |
f6b3597b AK |
448 | break; \ |
449 | } \ | |
450 | } while (0) | |
451 | ||
8a76d7f2 JR |
452 | static int emulator_check_intercept(struct x86_emulate_ctxt *ctxt, |
453 | enum x86_intercept intercept, | |
454 | enum x86_intercept_stage stage) | |
455 | { | |
456 | struct x86_instruction_info info = { | |
457 | .intercept = intercept, | |
9dac77fa AK |
458 | .rep_prefix = ctxt->rep_prefix, |
459 | .modrm_mod = ctxt->modrm_mod, | |
460 | .modrm_reg = ctxt->modrm_reg, | |
461 | .modrm_rm = ctxt->modrm_rm, | |
462 | .src_val = ctxt->src.val64, | |
463 | .src_bytes = ctxt->src.bytes, | |
464 | .dst_bytes = ctxt->dst.bytes, | |
465 | .ad_bytes = ctxt->ad_bytes, | |
8a76d7f2 JR |
466 | .next_rip = ctxt->eip, |
467 | }; | |
468 | ||
2953538e | 469 | return ctxt->ops->intercept(ctxt, &info, stage); |
8a76d7f2 JR |
470 | } |
471 | ||
f47cfa31 AK |
472 | static void assign_masked(ulong *dest, ulong src, ulong mask) |
473 | { | |
474 | *dest = (*dest & ~mask) | (src & mask); | |
475 | } | |
476 | ||
9dac77fa | 477 | static inline unsigned long ad_mask(struct x86_emulate_ctxt *ctxt) |
ddcb2885 | 478 | { |
9dac77fa | 479 | return (1UL << (ctxt->ad_bytes << 3)) - 1; |
ddcb2885 HH |
480 | } |
481 | ||
f47cfa31 AK |
482 | static ulong stack_mask(struct x86_emulate_ctxt *ctxt) |
483 | { | |
484 | u16 sel; | |
485 | struct desc_struct ss; | |
486 | ||
487 | if (ctxt->mode == X86EMUL_MODE_PROT64) | |
488 | return ~0UL; | |
489 | ctxt->ops->get_segment(ctxt, &sel, &ss, NULL, VCPU_SREG_SS); | |
490 | return ~0U >> ((ss.d ^ 1) * 16); /* d=0: 0xffff; d=1: 0xffffffff */ | |
491 | } | |
492 | ||
612e89f0 AK |
493 | static int stack_size(struct x86_emulate_ctxt *ctxt) |
494 | { | |
495 | return (__fls(stack_mask(ctxt)) + 1) >> 3; | |
496 | } | |
497 | ||
6aa8b732 | 498 | /* Access/update address held in a register, based on addressing mode. */ |
e4706772 | 499 | static inline unsigned long |
9dac77fa | 500 | address_mask(struct x86_emulate_ctxt *ctxt, unsigned long reg) |
e4706772 | 501 | { |
9dac77fa | 502 | if (ctxt->ad_bytes == sizeof(unsigned long)) |
e4706772 HH |
503 | return reg; |
504 | else | |
9dac77fa | 505 | return reg & ad_mask(ctxt); |
e4706772 HH |
506 | } |
507 | ||
508 | static inline unsigned long | |
9dac77fa | 509 | register_address(struct x86_emulate_ctxt *ctxt, unsigned long reg) |
e4706772 | 510 | { |
9dac77fa | 511 | return address_mask(ctxt, reg); |
e4706772 HH |
512 | } |
513 | ||
5ad105e5 AK |
514 | static void masked_increment(ulong *reg, ulong mask, int inc) |
515 | { | |
516 | assign_masked(reg, *reg + inc, mask); | |
517 | } | |
518 | ||
7a957275 | 519 | static inline void |
9dac77fa | 520 | register_address_increment(struct x86_emulate_ctxt *ctxt, unsigned long *reg, int inc) |
7a957275 | 521 | { |
5ad105e5 AK |
522 | ulong mask; |
523 | ||
9dac77fa | 524 | if (ctxt->ad_bytes == sizeof(unsigned long)) |
5ad105e5 | 525 | mask = ~0UL; |
7a957275 | 526 | else |
5ad105e5 AK |
527 | mask = ad_mask(ctxt); |
528 | masked_increment(reg, mask, inc); | |
529 | } | |
530 | ||
531 | static void rsp_increment(struct x86_emulate_ctxt *ctxt, int inc) | |
532 | { | |
dd856efa | 533 | masked_increment(reg_rmw(ctxt, VCPU_REGS_RSP), stack_mask(ctxt), inc); |
7a957275 | 534 | } |
6aa8b732 | 535 | |
9dac77fa | 536 | static inline void jmp_rel(struct x86_emulate_ctxt *ctxt, int rel) |
7a957275 | 537 | { |
9dac77fa | 538 | register_address_increment(ctxt, &ctxt->_eip, rel); |
7a957275 | 539 | } |
098c937b | 540 | |
56697687 AK |
541 | static u32 desc_limit_scaled(struct desc_struct *desc) |
542 | { | |
543 | u32 limit = get_desc_limit(desc); | |
544 | ||
545 | return desc->g ? (limit << 12) | 0xfff : limit; | |
546 | } | |
547 | ||
9dac77fa | 548 | static void set_seg_override(struct x86_emulate_ctxt *ctxt, int seg) |
7a5b56df | 549 | { |
9dac77fa AK |
550 | ctxt->has_seg_override = true; |
551 | ctxt->seg_override = seg; | |
7a5b56df AK |
552 | } |
553 | ||
7b105ca2 | 554 | static unsigned long seg_base(struct x86_emulate_ctxt *ctxt, int seg) |
7a5b56df AK |
555 | { |
556 | if (ctxt->mode == X86EMUL_MODE_PROT64 && seg < VCPU_SREG_FS) | |
557 | return 0; | |
558 | ||
7b105ca2 | 559 | return ctxt->ops->get_cached_segment_base(ctxt, seg); |
7a5b56df AK |
560 | } |
561 | ||
9dac77fa | 562 | static unsigned seg_override(struct x86_emulate_ctxt *ctxt) |
7a5b56df | 563 | { |
9dac77fa | 564 | if (!ctxt->has_seg_override) |
7a5b56df AK |
565 | return 0; |
566 | ||
9dac77fa | 567 | return ctxt->seg_override; |
7a5b56df AK |
568 | } |
569 | ||
35d3d4a1 AK |
570 | static int emulate_exception(struct x86_emulate_ctxt *ctxt, int vec, |
571 | u32 error, bool valid) | |
54b8486f | 572 | { |
da9cb575 AK |
573 | ctxt->exception.vector = vec; |
574 | ctxt->exception.error_code = error; | |
575 | ctxt->exception.error_code_valid = valid; | |
35d3d4a1 | 576 | return X86EMUL_PROPAGATE_FAULT; |
54b8486f GN |
577 | } |
578 | ||
3b88e41a JR |
579 | static int emulate_db(struct x86_emulate_ctxt *ctxt) |
580 | { | |
581 | return emulate_exception(ctxt, DB_VECTOR, 0, false); | |
582 | } | |
583 | ||
35d3d4a1 | 584 | static int emulate_gp(struct x86_emulate_ctxt *ctxt, int err) |
54b8486f | 585 | { |
35d3d4a1 | 586 | return emulate_exception(ctxt, GP_VECTOR, err, true); |
54b8486f GN |
587 | } |
588 | ||
618ff15d AK |
589 | static int emulate_ss(struct x86_emulate_ctxt *ctxt, int err) |
590 | { | |
591 | return emulate_exception(ctxt, SS_VECTOR, err, true); | |
592 | } | |
593 | ||
35d3d4a1 | 594 | static int emulate_ud(struct x86_emulate_ctxt *ctxt) |
54b8486f | 595 | { |
35d3d4a1 | 596 | return emulate_exception(ctxt, UD_VECTOR, 0, false); |
54b8486f GN |
597 | } |
598 | ||
35d3d4a1 | 599 | static int emulate_ts(struct x86_emulate_ctxt *ctxt, int err) |
54b8486f | 600 | { |
35d3d4a1 | 601 | return emulate_exception(ctxt, TS_VECTOR, err, true); |
54b8486f GN |
602 | } |
603 | ||
34d1f490 AK |
604 | static int emulate_de(struct x86_emulate_ctxt *ctxt) |
605 | { | |
35d3d4a1 | 606 | return emulate_exception(ctxt, DE_VECTOR, 0, false); |
34d1f490 AK |
607 | } |
608 | ||
1253791d AK |
609 | static int emulate_nm(struct x86_emulate_ctxt *ctxt) |
610 | { | |
611 | return emulate_exception(ctxt, NM_VECTOR, 0, false); | |
612 | } | |
613 | ||
1aa36616 AK |
614 | static u16 get_segment_selector(struct x86_emulate_ctxt *ctxt, unsigned seg) |
615 | { | |
616 | u16 selector; | |
617 | struct desc_struct desc; | |
618 | ||
619 | ctxt->ops->get_segment(ctxt, &selector, &desc, NULL, seg); | |
620 | return selector; | |
621 | } | |
622 | ||
623 | static void set_segment_selector(struct x86_emulate_ctxt *ctxt, u16 selector, | |
624 | unsigned seg) | |
625 | { | |
626 | u16 dummy; | |
627 | u32 base3; | |
628 | struct desc_struct desc; | |
629 | ||
630 | ctxt->ops->get_segment(ctxt, &dummy, &desc, &base3, seg); | |
631 | ctxt->ops->set_segment(ctxt, selector, &desc, base3, seg); | |
632 | } | |
633 | ||
1c11b376 AK |
634 | /* |
635 | * x86 defines three classes of vector instructions: explicitly | |
636 | * aligned, explicitly unaligned, and the rest, which change behaviour | |
637 | * depending on whether they're AVX encoded or not. | |
638 | * | |
639 | * Also included is CMPXCHG16B which is not a vector instruction, yet it is | |
640 | * subject to the same check. | |
641 | */ | |
642 | static bool insn_aligned(struct x86_emulate_ctxt *ctxt, unsigned size) | |
643 | { | |
644 | if (likely(size < 16)) | |
645 | return false; | |
646 | ||
647 | if (ctxt->d & Aligned) | |
648 | return true; | |
649 | else if (ctxt->d & Unaligned) | |
650 | return false; | |
651 | else if (ctxt->d & Avx) | |
652 | return false; | |
653 | else | |
654 | return true; | |
655 | } | |
656 | ||
3d9b938e | 657 | static int __linearize(struct x86_emulate_ctxt *ctxt, |
52fd8b44 | 658 | struct segmented_address addr, |
3d9b938e | 659 | unsigned size, bool write, bool fetch, |
52fd8b44 AK |
660 | ulong *linear) |
661 | { | |
618ff15d AK |
662 | struct desc_struct desc; |
663 | bool usable; | |
52fd8b44 | 664 | ulong la; |
618ff15d | 665 | u32 lim; |
1aa36616 | 666 | u16 sel; |
618ff15d | 667 | unsigned cpl, rpl; |
52fd8b44 | 668 | |
7b105ca2 | 669 | la = seg_base(ctxt, addr.seg) + addr.ea; |
618ff15d | 670 | switch (ctxt->mode) { |
618ff15d AK |
671 | case X86EMUL_MODE_PROT64: |
672 | if (((signed long)la << 16) >> 16 != la) | |
673 | return emulate_gp(ctxt, 0); | |
674 | break; | |
675 | default: | |
1aa36616 AK |
676 | usable = ctxt->ops->get_segment(ctxt, &sel, &desc, NULL, |
677 | addr.seg); | |
618ff15d AK |
678 | if (!usable) |
679 | goto bad; | |
680 | /* code segment or read-only data segment */ | |
681 | if (((desc.type & 8) || !(desc.type & 2)) && write) | |
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 | ||
dde7e6d1 AK |
1304 | memcpy(dest, rc->data + rc->pos, size); |
1305 | rc->pos += size; | |
1306 | return 1; | |
1307 | } | |
6aa8b732 | 1308 | |
7f3d35fd KW |
1309 | static int read_interrupt_descriptor(struct x86_emulate_ctxt *ctxt, |
1310 | u16 index, struct desc_struct *desc) | |
1311 | { | |
1312 | struct desc_ptr dt; | |
1313 | ulong addr; | |
1314 | ||
1315 | ctxt->ops->get_idt(ctxt, &dt); | |
1316 | ||
1317 | if (dt.size < index * 8 + 7) | |
1318 | return emulate_gp(ctxt, index << 3 | 0x2); | |
1319 | ||
1320 | addr = dt.address + index * 8; | |
1321 | return ctxt->ops->read_std(ctxt, addr, desc, sizeof *desc, | |
1322 | &ctxt->exception); | |
1323 | } | |
1324 | ||
dde7e6d1 | 1325 | static void get_descriptor_table_ptr(struct x86_emulate_ctxt *ctxt, |
dde7e6d1 AK |
1326 | u16 selector, struct desc_ptr *dt) |
1327 | { | |
7b105ca2 TY |
1328 | struct x86_emulate_ops *ops = ctxt->ops; |
1329 | ||
dde7e6d1 AK |
1330 | if (selector & 1 << 2) { |
1331 | struct desc_struct desc; | |
1aa36616 AK |
1332 | u16 sel; |
1333 | ||
dde7e6d1 | 1334 | memset (dt, 0, sizeof *dt); |
1aa36616 | 1335 | if (!ops->get_segment(ctxt, &sel, &desc, NULL, VCPU_SREG_LDTR)) |
dde7e6d1 | 1336 | return; |
e09d082c | 1337 | |
dde7e6d1 AK |
1338 | dt->size = desc_limit_scaled(&desc); /* what if limit > 65535? */ |
1339 | dt->address = get_desc_base(&desc); | |
1340 | } else | |
4bff1e86 | 1341 | ops->get_gdt(ctxt, dt); |
dde7e6d1 | 1342 | } |
120df890 | 1343 | |
dde7e6d1 AK |
1344 | /* allowed just for 8 bytes segments */ |
1345 | static int read_segment_descriptor(struct x86_emulate_ctxt *ctxt, | |
e919464b AK |
1346 | u16 selector, struct desc_struct *desc, |
1347 | ulong *desc_addr_p) | |
dde7e6d1 AK |
1348 | { |
1349 | struct desc_ptr dt; | |
1350 | u16 index = selector >> 3; | |
dde7e6d1 | 1351 | ulong addr; |
120df890 | 1352 | |
7b105ca2 | 1353 | get_descriptor_table_ptr(ctxt, selector, &dt); |
120df890 | 1354 | |
35d3d4a1 AK |
1355 | if (dt.size < index * 8 + 7) |
1356 | return emulate_gp(ctxt, selector & 0xfffc); | |
e09d082c | 1357 | |
e919464b | 1358 | *desc_addr_p = addr = dt.address + index * 8; |
7b105ca2 TY |
1359 | return ctxt->ops->read_std(ctxt, addr, desc, sizeof *desc, |
1360 | &ctxt->exception); | |
dde7e6d1 | 1361 | } |
ef65c889 | 1362 | |
dde7e6d1 AK |
1363 | /* allowed just for 8 bytes segments */ |
1364 | static int write_segment_descriptor(struct x86_emulate_ctxt *ctxt, | |
dde7e6d1 AK |
1365 | u16 selector, struct desc_struct *desc) |
1366 | { | |
1367 | struct desc_ptr dt; | |
1368 | u16 index = selector >> 3; | |
dde7e6d1 | 1369 | ulong addr; |
6aa8b732 | 1370 | |
7b105ca2 | 1371 | get_descriptor_table_ptr(ctxt, selector, &dt); |
6e3d5dfb | 1372 | |
35d3d4a1 AK |
1373 | if (dt.size < index * 8 + 7) |
1374 | return emulate_gp(ctxt, selector & 0xfffc); | |
6aa8b732 | 1375 | |
dde7e6d1 | 1376 | addr = dt.address + index * 8; |
7b105ca2 TY |
1377 | return ctxt->ops->write_std(ctxt, addr, desc, sizeof *desc, |
1378 | &ctxt->exception); | |
dde7e6d1 | 1379 | } |
c7e75a3d | 1380 | |
5601d05b | 1381 | /* Does not support long mode */ |
dde7e6d1 | 1382 | static int load_segment_descriptor(struct x86_emulate_ctxt *ctxt, |
dde7e6d1 AK |
1383 | u16 selector, int seg) |
1384 | { | |
869be99c | 1385 | struct desc_struct seg_desc, old_desc; |
dde7e6d1 AK |
1386 | u8 dpl, rpl, cpl; |
1387 | unsigned err_vec = GP_VECTOR; | |
1388 | u32 err_code = 0; | |
1389 | bool null_selector = !(selector & ~0x3); /* 0000-0003 are null */ | |
e919464b | 1390 | ulong desc_addr; |
dde7e6d1 | 1391 | int ret; |
03ebebeb | 1392 | u16 dummy; |
69f55cb1 | 1393 | |
dde7e6d1 | 1394 | memset(&seg_desc, 0, sizeof seg_desc); |
69f55cb1 | 1395 | |
dde7e6d1 AK |
1396 | if ((seg <= VCPU_SREG_GS && ctxt->mode == X86EMUL_MODE_VM86) |
1397 | || ctxt->mode == X86EMUL_MODE_REAL) { | |
1398 | /* set real mode segment descriptor */ | |
03ebebeb | 1399 | ctxt->ops->get_segment(ctxt, &dummy, &seg_desc, NULL, seg); |
dde7e6d1 | 1400 | set_desc_base(&seg_desc, selector << 4); |
dde7e6d1 AK |
1401 | goto load; |
1402 | } | |
1403 | ||
79d5b4c3 AK |
1404 | rpl = selector & 3; |
1405 | cpl = ctxt->ops->cpl(ctxt); | |
1406 | ||
1407 | /* NULL selector is not valid for TR, CS and SS (except for long mode) */ | |
1408 | if ((seg == VCPU_SREG_CS | |
1409 | || (seg == VCPU_SREG_SS | |
1410 | && (ctxt->mode != X86EMUL_MODE_PROT64 || rpl != cpl)) | |
1411 | || seg == VCPU_SREG_TR) | |
dde7e6d1 AK |
1412 | && null_selector) |
1413 | goto exception; | |
1414 | ||
1415 | /* TR should be in GDT only */ | |
1416 | if (seg == VCPU_SREG_TR && (selector & (1 << 2))) | |
1417 | goto exception; | |
1418 | ||
1419 | if (null_selector) /* for NULL selector skip all following checks */ | |
1420 | goto load; | |
1421 | ||
e919464b | 1422 | ret = read_segment_descriptor(ctxt, selector, &seg_desc, &desc_addr); |
dde7e6d1 AK |
1423 | if (ret != X86EMUL_CONTINUE) |
1424 | return ret; | |
1425 | ||
1426 | err_code = selector & 0xfffc; | |
1427 | err_vec = GP_VECTOR; | |
1428 | ||
fc058680 | 1429 | /* can't load system descriptor into segment selector */ |
dde7e6d1 AK |
1430 | if (seg <= VCPU_SREG_GS && !seg_desc.s) |
1431 | goto exception; | |
1432 | ||
1433 | if (!seg_desc.p) { | |
1434 | err_vec = (seg == VCPU_SREG_SS) ? SS_VECTOR : NP_VECTOR; | |
1435 | goto exception; | |
1436 | } | |
1437 | ||
dde7e6d1 | 1438 | dpl = seg_desc.dpl; |
dde7e6d1 AK |
1439 | |
1440 | switch (seg) { | |
1441 | case VCPU_SREG_SS: | |
1442 | /* | |
1443 | * segment is not a writable data segment or segment | |
1444 | * selector's RPL != CPL or segment selector's RPL != CPL | |
1445 | */ | |
1446 | if (rpl != cpl || (seg_desc.type & 0xa) != 0x2 || dpl != cpl) | |
1447 | goto exception; | |
6aa8b732 | 1448 | break; |
dde7e6d1 AK |
1449 | case VCPU_SREG_CS: |
1450 | if (!(seg_desc.type & 8)) | |
1451 | goto exception; | |
1452 | ||
1453 | if (seg_desc.type & 4) { | |
1454 | /* conforming */ | |
1455 | if (dpl > cpl) | |
1456 | goto exception; | |
1457 | } else { | |
1458 | /* nonconforming */ | |
1459 | if (rpl > cpl || dpl != cpl) | |
1460 | goto exception; | |
1461 | } | |
1462 | /* CS(RPL) <- CPL */ | |
1463 | selector = (selector & 0xfffc) | cpl; | |
6aa8b732 | 1464 | break; |
dde7e6d1 AK |
1465 | case VCPU_SREG_TR: |
1466 | if (seg_desc.s || (seg_desc.type != 1 && seg_desc.type != 9)) | |
1467 | goto exception; | |
869be99c AK |
1468 | old_desc = seg_desc; |
1469 | seg_desc.type |= 2; /* busy */ | |
1470 | ret = ctxt->ops->cmpxchg_emulated(ctxt, desc_addr, &old_desc, &seg_desc, | |
1471 | sizeof(seg_desc), &ctxt->exception); | |
1472 | if (ret != X86EMUL_CONTINUE) | |
1473 | return ret; | |
dde7e6d1 AK |
1474 | break; |
1475 | case VCPU_SREG_LDTR: | |
1476 | if (seg_desc.s || seg_desc.type != 2) | |
1477 | goto exception; | |
1478 | break; | |
1479 | default: /* DS, ES, FS, or GS */ | |
4e62417b | 1480 | /* |
dde7e6d1 AK |
1481 | * segment is not a data or readable code segment or |
1482 | * ((segment is a data or nonconforming code segment) | |
1483 | * and (both RPL and CPL > DPL)) | |
4e62417b | 1484 | */ |
dde7e6d1 AK |
1485 | if ((seg_desc.type & 0xa) == 0x8 || |
1486 | (((seg_desc.type & 0xc) != 0xc) && | |
1487 | (rpl > dpl && cpl > dpl))) | |
1488 | goto exception; | |
6aa8b732 | 1489 | break; |
dde7e6d1 AK |
1490 | } |
1491 | ||
1492 | if (seg_desc.s) { | |
1493 | /* mark segment as accessed */ | |
1494 | seg_desc.type |= 1; | |
7b105ca2 | 1495 | ret = write_segment_descriptor(ctxt, selector, &seg_desc); |
dde7e6d1 AK |
1496 | if (ret != X86EMUL_CONTINUE) |
1497 | return ret; | |
1498 | } | |
1499 | load: | |
7b105ca2 | 1500 | ctxt->ops->set_segment(ctxt, selector, &seg_desc, 0, seg); |
dde7e6d1 AK |
1501 | return X86EMUL_CONTINUE; |
1502 | exception: | |
1503 | emulate_exception(ctxt, err_vec, err_code, true); | |
1504 | return X86EMUL_PROPAGATE_FAULT; | |
1505 | } | |
1506 | ||
31be40b3 WY |
1507 | static void write_register_operand(struct operand *op) |
1508 | { | |
1509 | /* The 4-byte case *is* correct: in 64-bit mode we zero-extend. */ | |
1510 | switch (op->bytes) { | |
1511 | case 1: | |
1512 | *(u8 *)op->addr.reg = (u8)op->val; | |
1513 | break; | |
1514 | case 2: | |
1515 | *(u16 *)op->addr.reg = (u16)op->val; | |
1516 | break; | |
1517 | case 4: | |
1518 | *op->addr.reg = (u32)op->val; | |
1519 | break; /* 64b: zero-extend */ | |
1520 | case 8: | |
1521 | *op->addr.reg = op->val; | |
1522 | break; | |
1523 | } | |
1524 | } | |
1525 | ||
adddcecf | 1526 | static int writeback(struct x86_emulate_ctxt *ctxt) |
dde7e6d1 AK |
1527 | { |
1528 | int rc; | |
dde7e6d1 | 1529 | |
9dac77fa | 1530 | switch (ctxt->dst.type) { |
dde7e6d1 | 1531 | case OP_REG: |
9dac77fa | 1532 | write_register_operand(&ctxt->dst); |
6aa8b732 | 1533 | break; |
dde7e6d1 | 1534 | case OP_MEM: |
9dac77fa | 1535 | if (ctxt->lock_prefix) |
3ca3ac4d | 1536 | rc = segmented_cmpxchg(ctxt, |
9dac77fa AK |
1537 | ctxt->dst.addr.mem, |
1538 | &ctxt->dst.orig_val, | |
1539 | &ctxt->dst.val, | |
1540 | ctxt->dst.bytes); | |
341de7e3 | 1541 | else |
3ca3ac4d | 1542 | rc = segmented_write(ctxt, |
9dac77fa AK |
1543 | ctxt->dst.addr.mem, |
1544 | &ctxt->dst.val, | |
1545 | ctxt->dst.bytes); | |
dde7e6d1 AK |
1546 | if (rc != X86EMUL_CONTINUE) |
1547 | return rc; | |
a682e354 | 1548 | break; |
1253791d | 1549 | case OP_XMM: |
9dac77fa | 1550 | write_sse_reg(ctxt, &ctxt->dst.vec_val, ctxt->dst.addr.xmm); |
1253791d | 1551 | break; |
cbe2c9d3 AK |
1552 | case OP_MM: |
1553 | write_mmx_reg(ctxt, &ctxt->dst.mm_val, ctxt->dst.addr.mm); | |
1554 | break; | |
dde7e6d1 AK |
1555 | case OP_NONE: |
1556 | /* no writeback */ | |
414e6277 | 1557 | break; |
dde7e6d1 | 1558 | default: |
414e6277 | 1559 | break; |
6aa8b732 | 1560 | } |
dde7e6d1 AK |
1561 | return X86EMUL_CONTINUE; |
1562 | } | |
6aa8b732 | 1563 | |
51ddff50 | 1564 | static int push(struct x86_emulate_ctxt *ctxt, void *data, int bytes) |
dde7e6d1 | 1565 | { |
4179bb02 | 1566 | struct segmented_address addr; |
0dc8d10f | 1567 | |
5ad105e5 | 1568 | rsp_increment(ctxt, -bytes); |
dd856efa | 1569 | addr.ea = reg_read(ctxt, VCPU_REGS_RSP) & stack_mask(ctxt); |
4179bb02 TY |
1570 | addr.seg = VCPU_SREG_SS; |
1571 | ||
51ddff50 AK |
1572 | return segmented_write(ctxt, addr, data, bytes); |
1573 | } | |
1574 | ||
1575 | static int em_push(struct x86_emulate_ctxt *ctxt) | |
1576 | { | |
4179bb02 | 1577 | /* Disable writeback. */ |
9dac77fa | 1578 | ctxt->dst.type = OP_NONE; |
51ddff50 | 1579 | return push(ctxt, &ctxt->src.val, ctxt->op_bytes); |
dde7e6d1 | 1580 | } |
69f55cb1 | 1581 | |
dde7e6d1 | 1582 | static int emulate_pop(struct x86_emulate_ctxt *ctxt, |
dde7e6d1 AK |
1583 | void *dest, int len) |
1584 | { | |
dde7e6d1 | 1585 | int rc; |
90de84f5 | 1586 | struct segmented_address addr; |
8b4caf66 | 1587 | |
dd856efa | 1588 | addr.ea = reg_read(ctxt, VCPU_REGS_RSP) & stack_mask(ctxt); |
90de84f5 | 1589 | addr.seg = VCPU_SREG_SS; |
3ca3ac4d | 1590 | rc = segmented_read(ctxt, addr, dest, len); |
dde7e6d1 AK |
1591 | if (rc != X86EMUL_CONTINUE) |
1592 | return rc; | |
1593 | ||
5ad105e5 | 1594 | rsp_increment(ctxt, len); |
dde7e6d1 | 1595 | return rc; |
8b4caf66 LV |
1596 | } |
1597 | ||
c54fe504 TY |
1598 | static int em_pop(struct x86_emulate_ctxt *ctxt) |
1599 | { | |
9dac77fa | 1600 | return emulate_pop(ctxt, &ctxt->dst.val, ctxt->op_bytes); |
c54fe504 TY |
1601 | } |
1602 | ||
dde7e6d1 | 1603 | static int emulate_popf(struct x86_emulate_ctxt *ctxt, |
7b105ca2 | 1604 | void *dest, int len) |
9de41573 GN |
1605 | { |
1606 | int rc; | |
dde7e6d1 AK |
1607 | unsigned long val, change_mask; |
1608 | int iopl = (ctxt->eflags & X86_EFLAGS_IOPL) >> IOPL_SHIFT; | |
7b105ca2 | 1609 | int cpl = ctxt->ops->cpl(ctxt); |
9de41573 | 1610 | |
3b9be3bf | 1611 | rc = emulate_pop(ctxt, &val, len); |
dde7e6d1 AK |
1612 | if (rc != X86EMUL_CONTINUE) |
1613 | return rc; | |
9de41573 | 1614 | |
dde7e6d1 AK |
1615 | change_mask = EFLG_CF | EFLG_PF | EFLG_AF | EFLG_ZF | EFLG_SF | EFLG_OF |
1616 | | EFLG_TF | EFLG_DF | EFLG_NT | EFLG_RF | EFLG_AC | EFLG_ID; | |
9de41573 | 1617 | |
dde7e6d1 AK |
1618 | switch(ctxt->mode) { |
1619 | case X86EMUL_MODE_PROT64: | |
1620 | case X86EMUL_MODE_PROT32: | |
1621 | case X86EMUL_MODE_PROT16: | |
1622 | if (cpl == 0) | |
1623 | change_mask |= EFLG_IOPL; | |
1624 | if (cpl <= iopl) | |
1625 | change_mask |= EFLG_IF; | |
1626 | break; | |
1627 | case X86EMUL_MODE_VM86: | |
35d3d4a1 AK |
1628 | if (iopl < 3) |
1629 | return emulate_gp(ctxt, 0); | |
dde7e6d1 AK |
1630 | change_mask |= EFLG_IF; |
1631 | break; | |
1632 | default: /* real mode */ | |
1633 | change_mask |= (EFLG_IOPL | EFLG_IF); | |
1634 | break; | |
9de41573 | 1635 | } |
dde7e6d1 AK |
1636 | |
1637 | *(unsigned long *)dest = | |
1638 | (ctxt->eflags & ~change_mask) | (val & change_mask); | |
1639 | ||
1640 | return rc; | |
9de41573 GN |
1641 | } |
1642 | ||
62aaa2f0 TY |
1643 | static int em_popf(struct x86_emulate_ctxt *ctxt) |
1644 | { | |
9dac77fa AK |
1645 | ctxt->dst.type = OP_REG; |
1646 | ctxt->dst.addr.reg = &ctxt->eflags; | |
1647 | ctxt->dst.bytes = ctxt->op_bytes; | |
1648 | return emulate_popf(ctxt, &ctxt->dst.val, ctxt->op_bytes); | |
62aaa2f0 TY |
1649 | } |
1650 | ||
612e89f0 AK |
1651 | static int em_enter(struct x86_emulate_ctxt *ctxt) |
1652 | { | |
1653 | int rc; | |
1654 | unsigned frame_size = ctxt->src.val; | |
1655 | unsigned nesting_level = ctxt->src2.val & 31; | |
dd856efa | 1656 | ulong rbp; |
612e89f0 AK |
1657 | |
1658 | if (nesting_level) | |
1659 | return X86EMUL_UNHANDLEABLE; | |
1660 | ||
dd856efa AK |
1661 | rbp = reg_read(ctxt, VCPU_REGS_RBP); |
1662 | rc = push(ctxt, &rbp, stack_size(ctxt)); | |
612e89f0 AK |
1663 | if (rc != X86EMUL_CONTINUE) |
1664 | return rc; | |
dd856efa | 1665 | assign_masked(reg_rmw(ctxt, VCPU_REGS_RBP), reg_read(ctxt, VCPU_REGS_RSP), |
612e89f0 | 1666 | stack_mask(ctxt)); |
dd856efa AK |
1667 | assign_masked(reg_rmw(ctxt, VCPU_REGS_RSP), |
1668 | reg_read(ctxt, VCPU_REGS_RSP) - frame_size, | |
612e89f0 AK |
1669 | stack_mask(ctxt)); |
1670 | return X86EMUL_CONTINUE; | |
1671 | } | |
1672 | ||
f47cfa31 AK |
1673 | static int em_leave(struct x86_emulate_ctxt *ctxt) |
1674 | { | |
dd856efa | 1675 | assign_masked(reg_rmw(ctxt, VCPU_REGS_RSP), reg_read(ctxt, VCPU_REGS_RBP), |
f47cfa31 | 1676 | stack_mask(ctxt)); |
dd856efa | 1677 | return emulate_pop(ctxt, reg_rmw(ctxt, VCPU_REGS_RBP), ctxt->op_bytes); |
f47cfa31 AK |
1678 | } |
1679 | ||
1cd196ea | 1680 | static int em_push_sreg(struct x86_emulate_ctxt *ctxt) |
7b262e90 | 1681 | { |
1cd196ea AK |
1682 | int seg = ctxt->src2.val; |
1683 | ||
9dac77fa | 1684 | ctxt->src.val = get_segment_selector(ctxt, seg); |
7b262e90 | 1685 | |
4487b3b4 | 1686 | return em_push(ctxt); |
7b262e90 GN |
1687 | } |
1688 | ||
1cd196ea | 1689 | static int em_pop_sreg(struct x86_emulate_ctxt *ctxt) |
38ba30ba | 1690 | { |
1cd196ea | 1691 | int seg = ctxt->src2.val; |
dde7e6d1 AK |
1692 | unsigned long selector; |
1693 | int rc; | |
38ba30ba | 1694 | |
9dac77fa | 1695 | rc = emulate_pop(ctxt, &selector, ctxt->op_bytes); |
dde7e6d1 AK |
1696 | if (rc != X86EMUL_CONTINUE) |
1697 | return rc; | |
1698 | ||
7b105ca2 | 1699 | rc = load_segment_descriptor(ctxt, (u16)selector, seg); |
dde7e6d1 | 1700 | return rc; |
38ba30ba GN |
1701 | } |
1702 | ||
b96a7fad | 1703 | static int em_pusha(struct x86_emulate_ctxt *ctxt) |
38ba30ba | 1704 | { |
dd856efa | 1705 | unsigned long old_esp = reg_read(ctxt, VCPU_REGS_RSP); |
dde7e6d1 AK |
1706 | int rc = X86EMUL_CONTINUE; |
1707 | int reg = VCPU_REGS_RAX; | |
38ba30ba | 1708 | |
dde7e6d1 AK |
1709 | while (reg <= VCPU_REGS_RDI) { |
1710 | (reg == VCPU_REGS_RSP) ? | |
dd856efa | 1711 | (ctxt->src.val = old_esp) : (ctxt->src.val = reg_read(ctxt, reg)); |
38ba30ba | 1712 | |
4487b3b4 | 1713 | rc = em_push(ctxt); |
dde7e6d1 AK |
1714 | if (rc != X86EMUL_CONTINUE) |
1715 | return rc; | |
38ba30ba | 1716 | |
dde7e6d1 | 1717 | ++reg; |
38ba30ba | 1718 | } |
38ba30ba | 1719 | |
dde7e6d1 | 1720 | return rc; |
38ba30ba GN |
1721 | } |
1722 | ||
62aaa2f0 TY |
1723 | static int em_pushf(struct x86_emulate_ctxt *ctxt) |
1724 | { | |
9dac77fa | 1725 | ctxt->src.val = (unsigned long)ctxt->eflags; |
62aaa2f0 TY |
1726 | return em_push(ctxt); |
1727 | } | |
1728 | ||
b96a7fad | 1729 | static int em_popa(struct x86_emulate_ctxt *ctxt) |
38ba30ba | 1730 | { |
dde7e6d1 AK |
1731 | int rc = X86EMUL_CONTINUE; |
1732 | int reg = VCPU_REGS_RDI; | |
38ba30ba | 1733 | |
dde7e6d1 AK |
1734 | while (reg >= VCPU_REGS_RAX) { |
1735 | if (reg == VCPU_REGS_RSP) { | |
5ad105e5 | 1736 | rsp_increment(ctxt, ctxt->op_bytes); |
dde7e6d1 AK |
1737 | --reg; |
1738 | } | |
38ba30ba | 1739 | |
dd856efa | 1740 | rc = emulate_pop(ctxt, reg_rmw(ctxt, reg), ctxt->op_bytes); |
dde7e6d1 AK |
1741 | if (rc != X86EMUL_CONTINUE) |
1742 | break; | |
1743 | --reg; | |
38ba30ba | 1744 | } |
dde7e6d1 | 1745 | return rc; |
38ba30ba GN |
1746 | } |
1747 | ||
dd856efa | 1748 | static int __emulate_int_real(struct x86_emulate_ctxt *ctxt, int irq) |
6e154e56 | 1749 | { |
7b105ca2 | 1750 | struct x86_emulate_ops *ops = ctxt->ops; |
5c56e1cf | 1751 | int rc; |
6e154e56 MG |
1752 | struct desc_ptr dt; |
1753 | gva_t cs_addr; | |
1754 | gva_t eip_addr; | |
1755 | u16 cs, eip; | |
6e154e56 MG |
1756 | |
1757 | /* TODO: Add limit checks */ | |
9dac77fa | 1758 | ctxt->src.val = ctxt->eflags; |
4487b3b4 | 1759 | rc = em_push(ctxt); |
5c56e1cf AK |
1760 | if (rc != X86EMUL_CONTINUE) |
1761 | return rc; | |
6e154e56 MG |
1762 | |
1763 | ctxt->eflags &= ~(EFLG_IF | EFLG_TF | EFLG_AC); | |
1764 | ||
9dac77fa | 1765 | ctxt->src.val = get_segment_selector(ctxt, VCPU_SREG_CS); |
4487b3b4 | 1766 | rc = em_push(ctxt); |
5c56e1cf AK |
1767 | if (rc != X86EMUL_CONTINUE) |
1768 | return rc; | |
6e154e56 | 1769 | |
9dac77fa | 1770 | ctxt->src.val = ctxt->_eip; |
4487b3b4 | 1771 | rc = em_push(ctxt); |
5c56e1cf AK |
1772 | if (rc != X86EMUL_CONTINUE) |
1773 | return rc; | |
1774 | ||
4bff1e86 | 1775 | ops->get_idt(ctxt, &dt); |
6e154e56 MG |
1776 | |
1777 | eip_addr = dt.address + (irq << 2); | |
1778 | cs_addr = dt.address + (irq << 2) + 2; | |
1779 | ||
0f65dd70 | 1780 | rc = ops->read_std(ctxt, cs_addr, &cs, 2, &ctxt->exception); |
6e154e56 MG |
1781 | if (rc != X86EMUL_CONTINUE) |
1782 | return rc; | |
1783 | ||
0f65dd70 | 1784 | rc = ops->read_std(ctxt, eip_addr, &eip, 2, &ctxt->exception); |
6e154e56 MG |
1785 | if (rc != X86EMUL_CONTINUE) |
1786 | return rc; | |
1787 | ||
7b105ca2 | 1788 | rc = load_segment_descriptor(ctxt, cs, VCPU_SREG_CS); |
6e154e56 MG |
1789 | if (rc != X86EMUL_CONTINUE) |
1790 | return rc; | |
1791 | ||
9dac77fa | 1792 | ctxt->_eip = eip; |
6e154e56 MG |
1793 | |
1794 | return rc; | |
1795 | } | |
1796 | ||
dd856efa AK |
1797 | int emulate_int_real(struct x86_emulate_ctxt *ctxt, int irq) |
1798 | { | |
1799 | int rc; | |
1800 | ||
1801 | invalidate_registers(ctxt); | |
1802 | rc = __emulate_int_real(ctxt, irq); | |
1803 | if (rc == X86EMUL_CONTINUE) | |
1804 | writeback_registers(ctxt); | |
1805 | return rc; | |
1806 | } | |
1807 | ||
7b105ca2 | 1808 | static int emulate_int(struct x86_emulate_ctxt *ctxt, int irq) |
6e154e56 MG |
1809 | { |
1810 | switch(ctxt->mode) { | |
1811 | case X86EMUL_MODE_REAL: | |
dd856efa | 1812 | return __emulate_int_real(ctxt, irq); |
6e154e56 MG |
1813 | case X86EMUL_MODE_VM86: |
1814 | case X86EMUL_MODE_PROT16: | |
1815 | case X86EMUL_MODE_PROT32: | |
1816 | case X86EMUL_MODE_PROT64: | |
1817 | default: | |
1818 | /* Protected mode interrupts unimplemented yet */ | |
1819 | return X86EMUL_UNHANDLEABLE; | |
1820 | } | |
1821 | } | |
1822 | ||
7b105ca2 | 1823 | static int emulate_iret_real(struct x86_emulate_ctxt *ctxt) |
38ba30ba | 1824 | { |
dde7e6d1 AK |
1825 | int rc = X86EMUL_CONTINUE; |
1826 | unsigned long temp_eip = 0; | |
1827 | unsigned long temp_eflags = 0; | |
1828 | unsigned long cs = 0; | |
1829 | unsigned long mask = EFLG_CF | EFLG_PF | EFLG_AF | EFLG_ZF | EFLG_SF | EFLG_TF | | |
1830 | EFLG_IF | EFLG_DF | EFLG_OF | EFLG_IOPL | EFLG_NT | EFLG_RF | | |
1831 | EFLG_AC | EFLG_ID | (1 << 1); /* Last one is the reserved bit */ | |
1832 | unsigned long vm86_mask = EFLG_VM | EFLG_VIF | EFLG_VIP; | |
38ba30ba | 1833 | |
dde7e6d1 | 1834 | /* TODO: Add stack limit check */ |
38ba30ba | 1835 | |
9dac77fa | 1836 | rc = emulate_pop(ctxt, &temp_eip, ctxt->op_bytes); |
38ba30ba | 1837 | |
dde7e6d1 AK |
1838 | if (rc != X86EMUL_CONTINUE) |
1839 | return rc; | |
38ba30ba | 1840 | |
35d3d4a1 AK |
1841 | if (temp_eip & ~0xffff) |
1842 | return emulate_gp(ctxt, 0); | |
38ba30ba | 1843 | |
9dac77fa | 1844 | rc = emulate_pop(ctxt, &cs, ctxt->op_bytes); |
38ba30ba | 1845 | |
dde7e6d1 AK |
1846 | if (rc != X86EMUL_CONTINUE) |
1847 | return rc; | |
38ba30ba | 1848 | |
9dac77fa | 1849 | rc = emulate_pop(ctxt, &temp_eflags, ctxt->op_bytes); |
38ba30ba | 1850 | |
dde7e6d1 AK |
1851 | if (rc != X86EMUL_CONTINUE) |
1852 | return rc; | |
38ba30ba | 1853 | |
7b105ca2 | 1854 | rc = load_segment_descriptor(ctxt, (u16)cs, VCPU_SREG_CS); |
38ba30ba | 1855 | |
dde7e6d1 AK |
1856 | if (rc != X86EMUL_CONTINUE) |
1857 | return rc; | |
38ba30ba | 1858 | |
9dac77fa | 1859 | ctxt->_eip = temp_eip; |
38ba30ba | 1860 | |
38ba30ba | 1861 | |
9dac77fa | 1862 | if (ctxt->op_bytes == 4) |
dde7e6d1 | 1863 | ctxt->eflags = ((temp_eflags & mask) | (ctxt->eflags & vm86_mask)); |
9dac77fa | 1864 | else if (ctxt->op_bytes == 2) { |
dde7e6d1 AK |
1865 | ctxt->eflags &= ~0xffff; |
1866 | ctxt->eflags |= temp_eflags; | |
38ba30ba | 1867 | } |
dde7e6d1 AK |
1868 | |
1869 | ctxt->eflags &= ~EFLG_RESERVED_ZEROS_MASK; /* Clear reserved zeros */ | |
1870 | ctxt->eflags |= EFLG_RESERVED_ONE_MASK; | |
1871 | ||
1872 | return rc; | |
38ba30ba GN |
1873 | } |
1874 | ||
e01991e7 | 1875 | static int em_iret(struct x86_emulate_ctxt *ctxt) |
c37eda13 | 1876 | { |
dde7e6d1 AK |
1877 | switch(ctxt->mode) { |
1878 | case X86EMUL_MODE_REAL: | |
7b105ca2 | 1879 | return emulate_iret_real(ctxt); |
dde7e6d1 AK |
1880 | case X86EMUL_MODE_VM86: |
1881 | case X86EMUL_MODE_PROT16: | |
1882 | case X86EMUL_MODE_PROT32: | |
1883 | case X86EMUL_MODE_PROT64: | |
c37eda13 | 1884 | default: |
dde7e6d1 AK |
1885 | /* iret from protected mode unimplemented yet */ |
1886 | return X86EMUL_UNHANDLEABLE; | |
c37eda13 | 1887 | } |
c37eda13 WY |
1888 | } |
1889 | ||
d2f62766 TY |
1890 | static int em_jmp_far(struct x86_emulate_ctxt *ctxt) |
1891 | { | |
d2f62766 TY |
1892 | int rc; |
1893 | unsigned short sel; | |
1894 | ||
9dac77fa | 1895 | memcpy(&sel, ctxt->src.valptr + ctxt->op_bytes, 2); |
d2f62766 | 1896 | |
7b105ca2 | 1897 | rc = load_segment_descriptor(ctxt, sel, VCPU_SREG_CS); |
d2f62766 TY |
1898 | if (rc != X86EMUL_CONTINUE) |
1899 | return rc; | |
1900 | ||
9dac77fa AK |
1901 | ctxt->_eip = 0; |
1902 | memcpy(&ctxt->_eip, ctxt->src.valptr, ctxt->op_bytes); | |
d2f62766 TY |
1903 | return X86EMUL_CONTINUE; |
1904 | } | |
1905 | ||
51187683 | 1906 | static int em_grp2(struct x86_emulate_ctxt *ctxt) |
8cdbd2c9 | 1907 | { |
9dac77fa | 1908 | switch (ctxt->modrm_reg) { |
8cdbd2c9 | 1909 | case 0: /* rol */ |
a31b9cea | 1910 | emulate_2op_SrcB(ctxt, "rol"); |
8cdbd2c9 LV |
1911 | break; |
1912 | case 1: /* ror */ | |
a31b9cea | 1913 | emulate_2op_SrcB(ctxt, "ror"); |
8cdbd2c9 LV |
1914 | break; |
1915 | case 2: /* rcl */ | |
a31b9cea | 1916 | emulate_2op_SrcB(ctxt, "rcl"); |
8cdbd2c9 LV |
1917 | break; |
1918 | case 3: /* rcr */ | |
a31b9cea | 1919 | emulate_2op_SrcB(ctxt, "rcr"); |
8cdbd2c9 LV |
1920 | break; |
1921 | case 4: /* sal/shl */ | |
1922 | case 6: /* sal/shl */ | |
a31b9cea | 1923 | emulate_2op_SrcB(ctxt, "sal"); |
8cdbd2c9 LV |
1924 | break; |
1925 | case 5: /* shr */ | |
a31b9cea | 1926 | emulate_2op_SrcB(ctxt, "shr"); |
8cdbd2c9 LV |
1927 | break; |
1928 | case 7: /* sar */ | |
a31b9cea | 1929 | emulate_2op_SrcB(ctxt, "sar"); |
8cdbd2c9 LV |
1930 | break; |
1931 | } | |
51187683 | 1932 | return X86EMUL_CONTINUE; |
8cdbd2c9 LV |
1933 | } |
1934 | ||
3329ece1 AK |
1935 | static int em_not(struct x86_emulate_ctxt *ctxt) |
1936 | { | |
1937 | ctxt->dst.val = ~ctxt->dst.val; | |
1938 | return X86EMUL_CONTINUE; | |
1939 | } | |
1940 | ||
1941 | static int em_neg(struct x86_emulate_ctxt *ctxt) | |
1942 | { | |
1943 | emulate_1op(ctxt, "neg"); | |
1944 | return X86EMUL_CONTINUE; | |
1945 | } | |
1946 | ||
1947 | static int em_mul_ex(struct x86_emulate_ctxt *ctxt) | |
1948 | { | |
1949 | u8 ex = 0; | |
1950 | ||
1951 | emulate_1op_rax_rdx(ctxt, "mul", ex); | |
1952 | return X86EMUL_CONTINUE; | |
1953 | } | |
1954 | ||
1955 | static int em_imul_ex(struct x86_emulate_ctxt *ctxt) | |
1956 | { | |
1957 | u8 ex = 0; | |
1958 | ||
1959 | emulate_1op_rax_rdx(ctxt, "imul", ex); | |
1960 | return X86EMUL_CONTINUE; | |
1961 | } | |
1962 | ||
1963 | static int em_div_ex(struct x86_emulate_ctxt *ctxt) | |
8cdbd2c9 | 1964 | { |
34d1f490 | 1965 | u8 de = 0; |
8cdbd2c9 | 1966 | |
3329ece1 AK |
1967 | emulate_1op_rax_rdx(ctxt, "div", de); |
1968 | if (de) | |
1969 | return emulate_de(ctxt); | |
1970 | return X86EMUL_CONTINUE; | |
1971 | } | |
1972 | ||
1973 | static int em_idiv_ex(struct x86_emulate_ctxt *ctxt) | |
1974 | { | |
1975 | u8 de = 0; | |
1976 | ||
1977 | emulate_1op_rax_rdx(ctxt, "idiv", de); | |
34d1f490 AK |
1978 | if (de) |
1979 | return emulate_de(ctxt); | |
8c5eee30 | 1980 | return X86EMUL_CONTINUE; |
8cdbd2c9 LV |
1981 | } |
1982 | ||
51187683 | 1983 | static int em_grp45(struct x86_emulate_ctxt *ctxt) |
8cdbd2c9 | 1984 | { |
4179bb02 | 1985 | int rc = X86EMUL_CONTINUE; |
8cdbd2c9 | 1986 | |
9dac77fa | 1987 | switch (ctxt->modrm_reg) { |
8cdbd2c9 | 1988 | case 0: /* inc */ |
d1eef45d | 1989 | emulate_1op(ctxt, "inc"); |
8cdbd2c9 LV |
1990 | break; |
1991 | case 1: /* dec */ | |
d1eef45d | 1992 | emulate_1op(ctxt, "dec"); |
8cdbd2c9 | 1993 | break; |
d19292e4 MG |
1994 | case 2: /* call near abs */ { |
1995 | long int old_eip; | |
9dac77fa AK |
1996 | old_eip = ctxt->_eip; |
1997 | ctxt->_eip = ctxt->src.val; | |
1998 | ctxt->src.val = old_eip; | |
4487b3b4 | 1999 | rc = em_push(ctxt); |
d19292e4 MG |
2000 | break; |
2001 | } | |
8cdbd2c9 | 2002 | case 4: /* jmp abs */ |
9dac77fa | 2003 | ctxt->_eip = ctxt->src.val; |
8cdbd2c9 | 2004 | break; |
d2f62766 TY |
2005 | case 5: /* jmp far */ |
2006 | rc = em_jmp_far(ctxt); | |
2007 | break; | |
8cdbd2c9 | 2008 | case 6: /* push */ |
4487b3b4 | 2009 | rc = em_push(ctxt); |
8cdbd2c9 | 2010 | break; |
8cdbd2c9 | 2011 | } |
4179bb02 | 2012 | return rc; |
8cdbd2c9 LV |
2013 | } |
2014 | ||
e0dac408 | 2015 | static int em_cmpxchg8b(struct x86_emulate_ctxt *ctxt) |
8cdbd2c9 | 2016 | { |
9dac77fa | 2017 | u64 old = ctxt->dst.orig_val64; |
8cdbd2c9 | 2018 | |
dd856efa AK |
2019 | if (((u32) (old >> 0) != (u32) reg_read(ctxt, VCPU_REGS_RAX)) || |
2020 | ((u32) (old >> 32) != (u32) reg_read(ctxt, VCPU_REGS_RDX))) { | |
2021 | *reg_write(ctxt, VCPU_REGS_RAX) = (u32) (old >> 0); | |
2022 | *reg_write(ctxt, VCPU_REGS_RDX) = (u32) (old >> 32); | |
05f086f8 | 2023 | ctxt->eflags &= ~EFLG_ZF; |
8cdbd2c9 | 2024 | } else { |
dd856efa AK |
2025 | ctxt->dst.val64 = ((u64)reg_read(ctxt, VCPU_REGS_RCX) << 32) | |
2026 | (u32) reg_read(ctxt, VCPU_REGS_RBX); | |
8cdbd2c9 | 2027 | |
05f086f8 | 2028 | ctxt->eflags |= EFLG_ZF; |
8cdbd2c9 | 2029 | } |
1b30eaa8 | 2030 | return X86EMUL_CONTINUE; |
8cdbd2c9 LV |
2031 | } |
2032 | ||
ebda02c2 TY |
2033 | static int em_ret(struct x86_emulate_ctxt *ctxt) |
2034 | { | |
9dac77fa AK |
2035 | ctxt->dst.type = OP_REG; |
2036 | ctxt->dst.addr.reg = &ctxt->_eip; | |
2037 | ctxt->dst.bytes = ctxt->op_bytes; | |
ebda02c2 TY |
2038 | return em_pop(ctxt); |
2039 | } | |
2040 | ||
e01991e7 | 2041 | static int em_ret_far(struct x86_emulate_ctxt *ctxt) |
a77ab5ea | 2042 | { |
a77ab5ea AK |
2043 | int rc; |
2044 | unsigned long cs; | |
2045 | ||
9dac77fa | 2046 | rc = emulate_pop(ctxt, &ctxt->_eip, ctxt->op_bytes); |
1b30eaa8 | 2047 | if (rc != X86EMUL_CONTINUE) |
a77ab5ea | 2048 | return rc; |
9dac77fa AK |
2049 | if (ctxt->op_bytes == 4) |
2050 | ctxt->_eip = (u32)ctxt->_eip; | |
2051 | rc = emulate_pop(ctxt, &cs, ctxt->op_bytes); | |
1b30eaa8 | 2052 | if (rc != X86EMUL_CONTINUE) |
a77ab5ea | 2053 | return rc; |
7b105ca2 | 2054 | rc = load_segment_descriptor(ctxt, (u16)cs, VCPU_SREG_CS); |
a77ab5ea AK |
2055 | return rc; |
2056 | } | |
2057 | ||
e940b5c2 TY |
2058 | static int em_cmpxchg(struct x86_emulate_ctxt *ctxt) |
2059 | { | |
2060 | /* Save real source value, then compare EAX against destination. */ | |
2061 | ctxt->src.orig_val = ctxt->src.val; | |
dd856efa | 2062 | ctxt->src.val = reg_read(ctxt, VCPU_REGS_RAX); |
e940b5c2 TY |
2063 | emulate_2op_SrcV(ctxt, "cmp"); |
2064 | ||
2065 | if (ctxt->eflags & EFLG_ZF) { | |
2066 | /* Success: write back to memory. */ | |
2067 | ctxt->dst.val = ctxt->src.orig_val; | |
2068 | } else { | |
2069 | /* Failure: write the value we saw to EAX. */ | |
2070 | ctxt->dst.type = OP_REG; | |
dd856efa | 2071 | ctxt->dst.addr.reg = reg_rmw(ctxt, VCPU_REGS_RAX); |
e940b5c2 TY |
2072 | } |
2073 | return X86EMUL_CONTINUE; | |
2074 | } | |
2075 | ||
d4b4325f | 2076 | static int em_lseg(struct x86_emulate_ctxt *ctxt) |
09b5f4d3 | 2077 | { |
d4b4325f | 2078 | int seg = ctxt->src2.val; |
09b5f4d3 WY |
2079 | unsigned short sel; |
2080 | int rc; | |
2081 | ||
9dac77fa | 2082 | memcpy(&sel, ctxt->src.valptr + ctxt->op_bytes, 2); |
09b5f4d3 | 2083 | |
7b105ca2 | 2084 | rc = load_segment_descriptor(ctxt, sel, seg); |
09b5f4d3 WY |
2085 | if (rc != X86EMUL_CONTINUE) |
2086 | return rc; | |
2087 | ||
9dac77fa | 2088 | ctxt->dst.val = ctxt->src.val; |
09b5f4d3 WY |
2089 | return rc; |
2090 | } | |
2091 | ||
7b105ca2 | 2092 | static void |
e66bb2cc | 2093 | setup_syscalls_segments(struct x86_emulate_ctxt *ctxt, |
7b105ca2 | 2094 | struct desc_struct *cs, struct desc_struct *ss) |
e66bb2cc | 2095 | { |
e66bb2cc | 2096 | cs->l = 0; /* will be adjusted later */ |
79168fd1 | 2097 | set_desc_base(cs, 0); /* flat segment */ |
e66bb2cc | 2098 | cs->g = 1; /* 4kb granularity */ |
79168fd1 | 2099 | set_desc_limit(cs, 0xfffff); /* 4GB limit */ |
e66bb2cc AP |
2100 | cs->type = 0x0b; /* Read, Execute, Accessed */ |
2101 | cs->s = 1; | |
2102 | cs->dpl = 0; /* will be adjusted later */ | |
79168fd1 GN |
2103 | cs->p = 1; |
2104 | cs->d = 1; | |
99245b50 | 2105 | cs->avl = 0; |
e66bb2cc | 2106 | |
79168fd1 GN |
2107 | set_desc_base(ss, 0); /* flat segment */ |
2108 | set_desc_limit(ss, 0xfffff); /* 4GB limit */ | |
e66bb2cc AP |
2109 | ss->g = 1; /* 4kb granularity */ |
2110 | ss->s = 1; | |
2111 | ss->type = 0x03; /* Read/Write, Accessed */ | |
79168fd1 | 2112 | ss->d = 1; /* 32bit stack segment */ |
e66bb2cc | 2113 | ss->dpl = 0; |
79168fd1 | 2114 | ss->p = 1; |
99245b50 GN |
2115 | ss->l = 0; |
2116 | ss->avl = 0; | |
e66bb2cc AP |
2117 | } |
2118 | ||
1a18a69b AK |
2119 | static bool vendor_intel(struct x86_emulate_ctxt *ctxt) |
2120 | { | |
2121 | u32 eax, ebx, ecx, edx; | |
2122 | ||
2123 | eax = ecx = 0; | |
0017f93a AK |
2124 | ctxt->ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx); |
2125 | return ebx == X86EMUL_CPUID_VENDOR_GenuineIntel_ebx | |
1a18a69b AK |
2126 | && ecx == X86EMUL_CPUID_VENDOR_GenuineIntel_ecx |
2127 | && edx == X86EMUL_CPUID_VENDOR_GenuineIntel_edx; | |
2128 | } | |
2129 | ||
c2226fc9 SB |
2130 | static bool em_syscall_is_enabled(struct x86_emulate_ctxt *ctxt) |
2131 | { | |
2132 | struct x86_emulate_ops *ops = ctxt->ops; | |
2133 | u32 eax, ebx, ecx, edx; | |
2134 | ||
2135 | /* | |
2136 | * syscall should always be enabled in longmode - so only become | |
2137 | * vendor specific (cpuid) if other modes are active... | |
2138 | */ | |
2139 | if (ctxt->mode == X86EMUL_MODE_PROT64) | |
2140 | return true; | |
2141 | ||
2142 | eax = 0x00000000; | |
2143 | ecx = 0x00000000; | |
0017f93a AK |
2144 | ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx); |
2145 | /* | |
2146 | * Intel ("GenuineIntel") | |
2147 | * remark: Intel CPUs only support "syscall" in 64bit | |
2148 | * longmode. Also an 64bit guest with a | |
2149 | * 32bit compat-app running will #UD !! While this | |
2150 | * behaviour can be fixed (by emulating) into AMD | |
2151 | * response - CPUs of AMD can't behave like Intel. | |
2152 | */ | |
2153 | if (ebx == X86EMUL_CPUID_VENDOR_GenuineIntel_ebx && | |
2154 | ecx == X86EMUL_CPUID_VENDOR_GenuineIntel_ecx && | |
2155 | edx == X86EMUL_CPUID_VENDOR_GenuineIntel_edx) | |
2156 | return false; | |
2157 | ||
2158 | /* AMD ("AuthenticAMD") */ | |
2159 | if (ebx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ebx && | |
2160 | ecx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ecx && | |
2161 | edx == X86EMUL_CPUID_VENDOR_AuthenticAMD_edx) | |
2162 | return true; | |
2163 | ||
2164 | /* AMD ("AMDisbetter!") */ | |
2165 | if (ebx == X86EMUL_CPUID_VENDOR_AMDisbetterI_ebx && | |
2166 | ecx == X86EMUL_CPUID_VENDOR_AMDisbetterI_ecx && | |
2167 | edx == X86EMUL_CPUID_VENDOR_AMDisbetterI_edx) | |
2168 | return true; | |
c2226fc9 SB |
2169 | |
2170 | /* default: (not Intel, not AMD), apply Intel's stricter rules... */ | |
2171 | return false; | |
2172 | } | |
2173 | ||
e01991e7 | 2174 | static int em_syscall(struct x86_emulate_ctxt *ctxt) |
e66bb2cc | 2175 | { |
7b105ca2 | 2176 | struct x86_emulate_ops *ops = ctxt->ops; |
79168fd1 | 2177 | struct desc_struct cs, ss; |
e66bb2cc | 2178 | u64 msr_data; |
79168fd1 | 2179 | u16 cs_sel, ss_sel; |
c2ad2bb3 | 2180 | u64 efer = 0; |
e66bb2cc AP |
2181 | |
2182 | /* syscall is not available in real mode */ | |
2e901c4c | 2183 | if (ctxt->mode == X86EMUL_MODE_REAL || |
35d3d4a1 AK |
2184 | ctxt->mode == X86EMUL_MODE_VM86) |
2185 | return emulate_ud(ctxt); | |
e66bb2cc | 2186 | |
c2226fc9 SB |
2187 | if (!(em_syscall_is_enabled(ctxt))) |
2188 | return emulate_ud(ctxt); | |
2189 | ||
c2ad2bb3 | 2190 | ops->get_msr(ctxt, MSR_EFER, &efer); |
7b105ca2 | 2191 | setup_syscalls_segments(ctxt, &cs, &ss); |
e66bb2cc | 2192 | |
c2226fc9 SB |
2193 | if (!(efer & EFER_SCE)) |
2194 | return emulate_ud(ctxt); | |
2195 | ||
717746e3 | 2196 | ops->get_msr(ctxt, MSR_STAR, &msr_data); |
e66bb2cc | 2197 | msr_data >>= 32; |
79168fd1 GN |
2198 | cs_sel = (u16)(msr_data & 0xfffc); |
2199 | ss_sel = (u16)(msr_data + 8); | |
e66bb2cc | 2200 | |
c2ad2bb3 | 2201 | if (efer & EFER_LMA) { |
79168fd1 | 2202 | cs.d = 0; |
e66bb2cc AP |
2203 | cs.l = 1; |
2204 | } | |
1aa36616 AK |
2205 | ops->set_segment(ctxt, cs_sel, &cs, 0, VCPU_SREG_CS); |
2206 | ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS); | |
e66bb2cc | 2207 | |
dd856efa | 2208 | *reg_write(ctxt, VCPU_REGS_RCX) = ctxt->_eip; |
c2ad2bb3 | 2209 | if (efer & EFER_LMA) { |
e66bb2cc | 2210 | #ifdef CONFIG_X86_64 |
dd856efa | 2211 | *reg_write(ctxt, VCPU_REGS_R11) = ctxt->eflags & ~EFLG_RF; |
e66bb2cc | 2212 | |
717746e3 | 2213 | ops->get_msr(ctxt, |
3fb1b5db GN |
2214 | ctxt->mode == X86EMUL_MODE_PROT64 ? |
2215 | MSR_LSTAR : MSR_CSTAR, &msr_data); | |
9dac77fa | 2216 | ctxt->_eip = msr_data; |
e66bb2cc | 2217 | |
717746e3 | 2218 | ops->get_msr(ctxt, MSR_SYSCALL_MASK, &msr_data); |
e66bb2cc AP |
2219 | ctxt->eflags &= ~(msr_data | EFLG_RF); |
2220 | #endif | |
2221 | } else { | |
2222 | /* legacy mode */ | |
717746e3 | 2223 | ops->get_msr(ctxt, MSR_STAR, &msr_data); |
9dac77fa | 2224 | ctxt->_eip = (u32)msr_data; |
e66bb2cc AP |
2225 | |
2226 | ctxt->eflags &= ~(EFLG_VM | EFLG_IF | EFLG_RF); | |
2227 | } | |
2228 | ||
e54cfa97 | 2229 | return X86EMUL_CONTINUE; |
e66bb2cc AP |
2230 | } |
2231 | ||
e01991e7 | 2232 | static int em_sysenter(struct x86_emulate_ctxt *ctxt) |
8c604352 | 2233 | { |
7b105ca2 | 2234 | struct x86_emulate_ops *ops = ctxt->ops; |
79168fd1 | 2235 | struct desc_struct cs, ss; |
8c604352 | 2236 | u64 msr_data; |
79168fd1 | 2237 | u16 cs_sel, ss_sel; |
c2ad2bb3 | 2238 | u64 efer = 0; |
8c604352 | 2239 | |
7b105ca2 | 2240 | ops->get_msr(ctxt, MSR_EFER, &efer); |
a0044755 | 2241 | /* inject #GP if in real mode */ |
35d3d4a1 AK |
2242 | if (ctxt->mode == X86EMUL_MODE_REAL) |
2243 | return emulate_gp(ctxt, 0); | |
8c604352 | 2244 | |
1a18a69b AK |
2245 | /* |
2246 | * Not recognized on AMD in compat mode (but is recognized in legacy | |
2247 | * mode). | |
2248 | */ | |
2249 | if ((ctxt->mode == X86EMUL_MODE_PROT32) && (efer & EFER_LMA) | |
2250 | && !vendor_intel(ctxt)) | |
2251 | return emulate_ud(ctxt); | |
2252 | ||
8c604352 AP |
2253 | /* XXX sysenter/sysexit have not been tested in 64bit mode. |
2254 | * Therefore, we inject an #UD. | |
2255 | */ | |
35d3d4a1 AK |
2256 | if (ctxt->mode == X86EMUL_MODE_PROT64) |
2257 | return emulate_ud(ctxt); | |
8c604352 | 2258 | |
7b105ca2 | 2259 | setup_syscalls_segments(ctxt, &cs, &ss); |
8c604352 | 2260 | |
717746e3 | 2261 | ops->get_msr(ctxt, MSR_IA32_SYSENTER_CS, &msr_data); |
8c604352 AP |
2262 | switch (ctxt->mode) { |
2263 | case X86EMUL_MODE_PROT32: | |
35d3d4a1 AK |
2264 | if ((msr_data & 0xfffc) == 0x0) |
2265 | return emulate_gp(ctxt, 0); | |
8c604352 AP |
2266 | break; |
2267 | case X86EMUL_MODE_PROT64: | |
35d3d4a1 AK |
2268 | if (msr_data == 0x0) |
2269 | return emulate_gp(ctxt, 0); | |
8c604352 AP |
2270 | break; |
2271 | } | |
2272 | ||
2273 | ctxt->eflags &= ~(EFLG_VM | EFLG_IF | EFLG_RF); | |
79168fd1 GN |
2274 | cs_sel = (u16)msr_data; |
2275 | cs_sel &= ~SELECTOR_RPL_MASK; | |
2276 | ss_sel = cs_sel + 8; | |
2277 | ss_sel &= ~SELECTOR_RPL_MASK; | |
c2ad2bb3 | 2278 | if (ctxt->mode == X86EMUL_MODE_PROT64 || (efer & EFER_LMA)) { |
79168fd1 | 2279 | cs.d = 0; |
8c604352 AP |
2280 | cs.l = 1; |
2281 | } | |
2282 | ||
1aa36616 AK |
2283 | ops->set_segment(ctxt, cs_sel, &cs, 0, VCPU_SREG_CS); |
2284 | ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS); | |
8c604352 | 2285 | |
717746e3 | 2286 | ops->get_msr(ctxt, MSR_IA32_SYSENTER_EIP, &msr_data); |
9dac77fa | 2287 | ctxt->_eip = msr_data; |
8c604352 | 2288 | |
717746e3 | 2289 | ops->get_msr(ctxt, MSR_IA32_SYSENTER_ESP, &msr_data); |
dd856efa | 2290 | *reg_write(ctxt, VCPU_REGS_RSP) = msr_data; |
8c604352 | 2291 | |
e54cfa97 | 2292 | return X86EMUL_CONTINUE; |
8c604352 AP |
2293 | } |
2294 | ||
e01991e7 | 2295 | static int em_sysexit(struct x86_emulate_ctxt *ctxt) |
4668f050 | 2296 | { |
7b105ca2 | 2297 | struct x86_emulate_ops *ops = ctxt->ops; |
79168fd1 | 2298 | struct desc_struct cs, ss; |
4668f050 AP |
2299 | u64 msr_data; |
2300 | int usermode; | |
1249b96e | 2301 | u16 cs_sel = 0, ss_sel = 0; |
4668f050 | 2302 | |
a0044755 GN |
2303 | /* inject #GP if in real mode or Virtual 8086 mode */ |
2304 | if (ctxt->mode == X86EMUL_MODE_REAL || | |
35d3d4a1 AK |
2305 | ctxt->mode == X86EMUL_MODE_VM86) |
2306 | return emulate_gp(ctxt, 0); | |
4668f050 | 2307 | |
7b105ca2 | 2308 | setup_syscalls_segments(ctxt, &cs, &ss); |
4668f050 | 2309 | |
9dac77fa | 2310 | if ((ctxt->rex_prefix & 0x8) != 0x0) |
4668f050 AP |
2311 | usermode = X86EMUL_MODE_PROT64; |
2312 | else | |
2313 | usermode = X86EMUL_MODE_PROT32; | |
2314 | ||
2315 | cs.dpl = 3; | |
2316 | ss.dpl = 3; | |
717746e3 | 2317 | ops->get_msr(ctxt, MSR_IA32_SYSENTER_CS, &msr_data); |
4668f050 AP |
2318 | switch (usermode) { |
2319 | case X86EMUL_MODE_PROT32: | |
79168fd1 | 2320 | cs_sel = (u16)(msr_data + 16); |
35d3d4a1 AK |
2321 | if ((msr_data & 0xfffc) == 0x0) |
2322 | return emulate_gp(ctxt, 0); | |
79168fd1 | 2323 | ss_sel = (u16)(msr_data + 24); |
4668f050 AP |
2324 | break; |
2325 | case X86EMUL_MODE_PROT64: | |
79168fd1 | 2326 | cs_sel = (u16)(msr_data + 32); |
35d3d4a1 AK |
2327 | if (msr_data == 0x0) |
2328 | return emulate_gp(ctxt, 0); | |
79168fd1 GN |
2329 | ss_sel = cs_sel + 8; |
2330 | cs.d = 0; | |
4668f050 AP |
2331 | cs.l = 1; |
2332 | break; | |
2333 | } | |
79168fd1 GN |
2334 | cs_sel |= SELECTOR_RPL_MASK; |
2335 | ss_sel |= SELECTOR_RPL_MASK; | |
4668f050 | 2336 | |
1aa36616 AK |
2337 | ops->set_segment(ctxt, cs_sel, &cs, 0, VCPU_SREG_CS); |
2338 | ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS); | |
4668f050 | 2339 | |
dd856efa AK |
2340 | ctxt->_eip = reg_read(ctxt, VCPU_REGS_RDX); |
2341 | *reg_write(ctxt, VCPU_REGS_RSP) = reg_read(ctxt, VCPU_REGS_RCX); | |
4668f050 | 2342 | |
e54cfa97 | 2343 | return X86EMUL_CONTINUE; |
4668f050 AP |
2344 | } |
2345 | ||
7b105ca2 | 2346 | static bool emulator_bad_iopl(struct x86_emulate_ctxt *ctxt) |
f850e2e6 GN |
2347 | { |
2348 | int iopl; | |
2349 | if (ctxt->mode == X86EMUL_MODE_REAL) | |
2350 | return false; | |
2351 | if (ctxt->mode == X86EMUL_MODE_VM86) | |
2352 | return true; | |
2353 | iopl = (ctxt->eflags & X86_EFLAGS_IOPL) >> IOPL_SHIFT; | |
7b105ca2 | 2354 | return ctxt->ops->cpl(ctxt) > iopl; |
f850e2e6 GN |
2355 | } |
2356 | ||
2357 | static bool emulator_io_port_access_allowed(struct x86_emulate_ctxt *ctxt, | |
f850e2e6 GN |
2358 | u16 port, u16 len) |
2359 | { | |
7b105ca2 | 2360 | struct x86_emulate_ops *ops = ctxt->ops; |
79168fd1 | 2361 | struct desc_struct tr_seg; |
5601d05b | 2362 | u32 base3; |
f850e2e6 | 2363 | int r; |
1aa36616 | 2364 | u16 tr, io_bitmap_ptr, perm, bit_idx = port & 0x7; |
f850e2e6 | 2365 | unsigned mask = (1 << len) - 1; |
5601d05b | 2366 | unsigned long base; |
f850e2e6 | 2367 | |
1aa36616 | 2368 | ops->get_segment(ctxt, &tr, &tr_seg, &base3, VCPU_SREG_TR); |
79168fd1 | 2369 | if (!tr_seg.p) |
f850e2e6 | 2370 | return false; |
79168fd1 | 2371 | if (desc_limit_scaled(&tr_seg) < 103) |
f850e2e6 | 2372 | return false; |
5601d05b GN |
2373 | base = get_desc_base(&tr_seg); |
2374 | #ifdef CONFIG_X86_64 | |
2375 | base |= ((u64)base3) << 32; | |
2376 | #endif | |
0f65dd70 | 2377 | r = ops->read_std(ctxt, base + 102, &io_bitmap_ptr, 2, NULL); |
f850e2e6 GN |
2378 | if (r != X86EMUL_CONTINUE) |
2379 | return false; | |
79168fd1 | 2380 | if (io_bitmap_ptr + port/8 > desc_limit_scaled(&tr_seg)) |
f850e2e6 | 2381 | return false; |
0f65dd70 | 2382 | r = ops->read_std(ctxt, base + io_bitmap_ptr + port/8, &perm, 2, NULL); |
f850e2e6 GN |
2383 | if (r != X86EMUL_CONTINUE) |
2384 | return false; | |
2385 | if ((perm >> bit_idx) & mask) | |
2386 | return false; | |
2387 | return true; | |
2388 | } | |
2389 | ||
2390 | static bool emulator_io_permited(struct x86_emulate_ctxt *ctxt, | |
f850e2e6 GN |
2391 | u16 port, u16 len) |
2392 | { | |
4fc40f07 GN |
2393 | if (ctxt->perm_ok) |
2394 | return true; | |
2395 | ||
7b105ca2 TY |
2396 | if (emulator_bad_iopl(ctxt)) |
2397 | if (!emulator_io_port_access_allowed(ctxt, port, len)) | |
f850e2e6 | 2398 | return false; |
4fc40f07 GN |
2399 | |
2400 | ctxt->perm_ok = true; | |
2401 | ||
f850e2e6 GN |
2402 | return true; |
2403 | } | |
2404 | ||
38ba30ba | 2405 | static void save_state_to_tss16(struct x86_emulate_ctxt *ctxt, |
38ba30ba GN |
2406 | struct tss_segment_16 *tss) |
2407 | { | |
9dac77fa | 2408 | tss->ip = ctxt->_eip; |
38ba30ba | 2409 | tss->flag = ctxt->eflags; |
dd856efa AK |
2410 | tss->ax = reg_read(ctxt, VCPU_REGS_RAX); |
2411 | tss->cx = reg_read(ctxt, VCPU_REGS_RCX); | |
2412 | tss->dx = reg_read(ctxt, VCPU_REGS_RDX); | |
2413 | tss->bx = reg_read(ctxt, VCPU_REGS_RBX); | |
2414 | tss->sp = reg_read(ctxt, VCPU_REGS_RSP); | |
2415 | tss->bp = reg_read(ctxt, VCPU_REGS_RBP); | |
2416 | tss->si = reg_read(ctxt, VCPU_REGS_RSI); | |
2417 | tss->di = reg_read(ctxt, VCPU_REGS_RDI); | |
38ba30ba | 2418 | |
1aa36616 AK |
2419 | tss->es = get_segment_selector(ctxt, VCPU_SREG_ES); |
2420 | tss->cs = get_segment_selector(ctxt, VCPU_SREG_CS); | |
2421 | tss->ss = get_segment_selector(ctxt, VCPU_SREG_SS); | |
2422 | tss->ds = get_segment_selector(ctxt, VCPU_SREG_DS); | |
2423 | tss->ldt = get_segment_selector(ctxt, VCPU_SREG_LDTR); | |
38ba30ba GN |
2424 | } |
2425 | ||
2426 | static int load_state_from_tss16(struct x86_emulate_ctxt *ctxt, | |
38ba30ba GN |
2427 | struct tss_segment_16 *tss) |
2428 | { | |
38ba30ba GN |
2429 | int ret; |
2430 | ||
9dac77fa | 2431 | ctxt->_eip = tss->ip; |
38ba30ba | 2432 | ctxt->eflags = tss->flag | 2; |
dd856efa AK |
2433 | *reg_write(ctxt, VCPU_REGS_RAX) = tss->ax; |
2434 | *reg_write(ctxt, VCPU_REGS_RCX) = tss->cx; | |
2435 | *reg_write(ctxt, VCPU_REGS_RDX) = tss->dx; | |
2436 | *reg_write(ctxt, VCPU_REGS_RBX) = tss->bx; | |
2437 | *reg_write(ctxt, VCPU_REGS_RSP) = tss->sp; | |
2438 | *reg_write(ctxt, VCPU_REGS_RBP) = tss->bp; | |
2439 | *reg_write(ctxt, VCPU_REGS_RSI) = tss->si; | |
2440 | *reg_write(ctxt, VCPU_REGS_RDI) = tss->di; | |
38ba30ba GN |
2441 | |
2442 | /* | |
2443 | * SDM says that segment selectors are loaded before segment | |
2444 | * descriptors | |
2445 | */ | |
1aa36616 AK |
2446 | set_segment_selector(ctxt, tss->ldt, VCPU_SREG_LDTR); |
2447 | set_segment_selector(ctxt, tss->es, VCPU_SREG_ES); | |
2448 | set_segment_selector(ctxt, tss->cs, VCPU_SREG_CS); | |
2449 | set_segment_selector(ctxt, tss->ss, VCPU_SREG_SS); | |
2450 | set_segment_selector(ctxt, tss->ds, VCPU_SREG_DS); | |
38ba30ba GN |
2451 | |
2452 | /* | |
fc058680 | 2453 | * Now load segment descriptors. If fault happens at this stage |
38ba30ba GN |
2454 | * it is handled in a context of new task |
2455 | */ | |
7b105ca2 | 2456 | ret = load_segment_descriptor(ctxt, tss->ldt, VCPU_SREG_LDTR); |
38ba30ba GN |
2457 | if (ret != X86EMUL_CONTINUE) |
2458 | return ret; | |
7b105ca2 | 2459 | ret = load_segment_descriptor(ctxt, tss->es, VCPU_SREG_ES); |
38ba30ba GN |
2460 | if (ret != X86EMUL_CONTINUE) |
2461 | return ret; | |
7b105ca2 | 2462 | ret = load_segment_descriptor(ctxt, tss->cs, VCPU_SREG_CS); |
38ba30ba GN |
2463 | if (ret != X86EMUL_CONTINUE) |
2464 | return ret; | |
7b105ca2 | 2465 | ret = load_segment_descriptor(ctxt, tss->ss, VCPU_SREG_SS); |
38ba30ba GN |
2466 | if (ret != X86EMUL_CONTINUE) |
2467 | return ret; | |
7b105ca2 | 2468 | ret = load_segment_descriptor(ctxt, tss->ds, VCPU_SREG_DS); |
38ba30ba GN |
2469 | if (ret != X86EMUL_CONTINUE) |
2470 | return ret; | |
2471 | ||
2472 | return X86EMUL_CONTINUE; | |
2473 | } | |
2474 | ||
2475 | static int task_switch_16(struct x86_emulate_ctxt *ctxt, | |
38ba30ba GN |
2476 | u16 tss_selector, u16 old_tss_sel, |
2477 | ulong old_tss_base, struct desc_struct *new_desc) | |
2478 | { | |
7b105ca2 | 2479 | struct x86_emulate_ops *ops = ctxt->ops; |
38ba30ba GN |
2480 | struct tss_segment_16 tss_seg; |
2481 | int ret; | |
bcc55cba | 2482 | u32 new_tss_base = get_desc_base(new_desc); |
38ba30ba | 2483 | |
0f65dd70 | 2484 | ret = ops->read_std(ctxt, old_tss_base, &tss_seg, sizeof tss_seg, |
bcc55cba | 2485 | &ctxt->exception); |
db297e3d | 2486 | if (ret != X86EMUL_CONTINUE) |
38ba30ba | 2487 | /* FIXME: need to provide precise fault address */ |
38ba30ba | 2488 | return ret; |
38ba30ba | 2489 | |
7b105ca2 | 2490 | save_state_to_tss16(ctxt, &tss_seg); |
38ba30ba | 2491 | |
0f65dd70 | 2492 | ret = ops->write_std(ctxt, old_tss_base, &tss_seg, sizeof tss_seg, |
bcc55cba | 2493 | &ctxt->exception); |
db297e3d | 2494 | if (ret != X86EMUL_CONTINUE) |
38ba30ba | 2495 | /* FIXME: need to provide precise fault address */ |
38ba30ba | 2496 | return ret; |
38ba30ba | 2497 | |
0f65dd70 | 2498 | ret = ops->read_std(ctxt, new_tss_base, &tss_seg, sizeof tss_seg, |
bcc55cba | 2499 | &ctxt->exception); |
db297e3d | 2500 | if (ret != X86EMUL_CONTINUE) |
38ba30ba | 2501 | /* FIXME: need to provide precise fault address */ |
38ba30ba | 2502 | return ret; |
38ba30ba GN |
2503 | |
2504 | if (old_tss_sel != 0xffff) { | |
2505 | tss_seg.prev_task_link = old_tss_sel; | |
2506 | ||
0f65dd70 | 2507 | ret = ops->write_std(ctxt, new_tss_base, |
38ba30ba GN |
2508 | &tss_seg.prev_task_link, |
2509 | sizeof tss_seg.prev_task_link, | |
0f65dd70 | 2510 | &ctxt->exception); |
db297e3d | 2511 | if (ret != X86EMUL_CONTINUE) |
38ba30ba | 2512 | /* FIXME: need to provide precise fault address */ |
38ba30ba | 2513 | return ret; |
38ba30ba GN |
2514 | } |
2515 | ||
7b105ca2 | 2516 | return load_state_from_tss16(ctxt, &tss_seg); |
38ba30ba GN |
2517 | } |
2518 | ||
2519 | static void save_state_to_tss32(struct x86_emulate_ctxt *ctxt, | |
38ba30ba GN |
2520 | struct tss_segment_32 *tss) |
2521 | { | |
7b105ca2 | 2522 | tss->cr3 = ctxt->ops->get_cr(ctxt, 3); |
9dac77fa | 2523 | tss->eip = ctxt->_eip; |
38ba30ba | 2524 | tss->eflags = ctxt->eflags; |
dd856efa AK |
2525 | tss->eax = reg_read(ctxt, VCPU_REGS_RAX); |
2526 | tss->ecx = reg_read(ctxt, VCPU_REGS_RCX); | |
2527 | tss->edx = reg_read(ctxt, VCPU_REGS_RDX); | |
2528 | tss->ebx = reg_read(ctxt, VCPU_REGS_RBX); | |
2529 | tss->esp = reg_read(ctxt, VCPU_REGS_RSP); | |
2530 | tss->ebp = reg_read(ctxt, VCPU_REGS_RBP); | |
2531 | tss->esi = reg_read(ctxt, VCPU_REGS_RSI); | |
2532 | tss->edi = reg_read(ctxt, VCPU_REGS_RDI); | |
38ba30ba | 2533 | |
1aa36616 AK |
2534 | tss->es = get_segment_selector(ctxt, VCPU_SREG_ES); |
2535 | tss->cs = get_segment_selector(ctxt, VCPU_SREG_CS); | |
2536 | tss->ss = get_segment_selector(ctxt, VCPU_SREG_SS); | |
2537 | tss->ds = get_segment_selector(ctxt, VCPU_SREG_DS); | |
2538 | tss->fs = get_segment_selector(ctxt, VCPU_SREG_FS); | |
2539 | tss->gs = get_segment_selector(ctxt, VCPU_SREG_GS); | |
2540 | tss->ldt_selector = get_segment_selector(ctxt, VCPU_SREG_LDTR); | |
38ba30ba GN |
2541 | } |
2542 | ||
2543 | static int load_state_from_tss32(struct x86_emulate_ctxt *ctxt, | |
38ba30ba GN |
2544 | struct tss_segment_32 *tss) |
2545 | { | |
38ba30ba GN |
2546 | int ret; |
2547 | ||
7b105ca2 | 2548 | if (ctxt->ops->set_cr(ctxt, 3, tss->cr3)) |
35d3d4a1 | 2549 | return emulate_gp(ctxt, 0); |
9dac77fa | 2550 | ctxt->_eip = tss->eip; |
38ba30ba | 2551 | ctxt->eflags = tss->eflags | 2; |
4cee4798 KW |
2552 | |
2553 | /* General purpose registers */ | |
dd856efa AK |
2554 | *reg_write(ctxt, VCPU_REGS_RAX) = tss->eax; |
2555 | *reg_write(ctxt, VCPU_REGS_RCX) = tss->ecx; | |
2556 | *reg_write(ctxt, VCPU_REGS_RDX) = tss->edx; | |
2557 | *reg_write(ctxt, VCPU_REGS_RBX) = tss->ebx; | |
2558 | *reg_write(ctxt, VCPU_REGS_RSP) = tss->esp; | |
2559 | *reg_write(ctxt, VCPU_REGS_RBP) = tss->ebp; | |
2560 | *reg_write(ctxt, VCPU_REGS_RSI) = tss->esi; | |
2561 | *reg_write(ctxt, VCPU_REGS_RDI) = tss->edi; | |
38ba30ba GN |
2562 | |
2563 | /* | |
2564 | * SDM says that segment selectors are loaded before segment | |
2565 | * descriptors | |
2566 | */ | |
1aa36616 AK |
2567 | set_segment_selector(ctxt, tss->ldt_selector, VCPU_SREG_LDTR); |
2568 | set_segment_selector(ctxt, tss->es, VCPU_SREG_ES); | |
2569 | set_segment_selector(ctxt, tss->cs, VCPU_SREG_CS); | |
2570 | set_segment_selector(ctxt, tss->ss, VCPU_SREG_SS); | |
2571 | set_segment_selector(ctxt, tss->ds, VCPU_SREG_DS); | |
2572 | set_segment_selector(ctxt, tss->fs, VCPU_SREG_FS); | |
2573 | set_segment_selector(ctxt, tss->gs, VCPU_SREG_GS); | |
38ba30ba | 2574 | |
4cee4798 KW |
2575 | /* |
2576 | * If we're switching between Protected Mode and VM86, we need to make | |
2577 | * sure to update the mode before loading the segment descriptors so | |
2578 | * that the selectors are interpreted correctly. | |
2579 | * | |
2580 | * Need to get rflags to the vcpu struct immediately because it | |
2581 | * influences the CPL which is checked at least when loading the segment | |
2582 | * descriptors and when pushing an error code to the new kernel stack. | |
2583 | * | |
2584 | * TODO Introduce a separate ctxt->ops->set_cpl callback | |
2585 | */ | |
2586 | if (ctxt->eflags & X86_EFLAGS_VM) | |
2587 | ctxt->mode = X86EMUL_MODE_VM86; | |
2588 | else | |
2589 | ctxt->mode = X86EMUL_MODE_PROT32; | |
2590 | ||
2591 | ctxt->ops->set_rflags(ctxt, ctxt->eflags); | |
2592 | ||
38ba30ba GN |
2593 | /* |
2594 | * Now load segment descriptors. If fault happenes at this stage | |
2595 | * it is handled in a context of new task | |
2596 | */ | |
7b105ca2 | 2597 | ret = load_segment_descriptor(ctxt, tss->ldt_selector, VCPU_SREG_LDTR); |
38ba30ba GN |
2598 | if (ret != X86EMUL_CONTINUE) |
2599 | return ret; | |
7b105ca2 | 2600 | ret = load_segment_descriptor(ctxt, tss->es, VCPU_SREG_ES); |
38ba30ba GN |
2601 | if (ret != X86EMUL_CONTINUE) |
2602 | return ret; | |
7b105ca2 | 2603 | ret = load_segment_descriptor(ctxt, tss->cs, VCPU_SREG_CS); |
38ba30ba GN |
2604 | if (ret != X86EMUL_CONTINUE) |
2605 | return ret; | |
7b105ca2 | 2606 | ret = load_segment_descriptor(ctxt, tss->ss, VCPU_SREG_SS); |
38ba30ba GN |
2607 | if (ret != X86EMUL_CONTINUE) |
2608 | return ret; | |
7b105ca2 | 2609 | ret = load_segment_descriptor(ctxt, tss->ds, VCPU_SREG_DS); |
38ba30ba GN |
2610 | if (ret != X86EMUL_CONTINUE) |
2611 | return ret; | |
7b105ca2 | 2612 | ret = load_segment_descriptor(ctxt, tss->fs, VCPU_SREG_FS); |
38ba30ba GN |
2613 | if (ret != X86EMUL_CONTINUE) |
2614 | return ret; | |
7b105ca2 | 2615 | ret = load_segment_descriptor(ctxt, tss->gs, VCPU_SREG_GS); |
38ba30ba GN |
2616 | if (ret != X86EMUL_CONTINUE) |
2617 | return ret; | |
2618 | ||
2619 | return X86EMUL_CONTINUE; | |
2620 | } | |
2621 | ||
2622 | static int task_switch_32(struct x86_emulate_ctxt *ctxt, | |
38ba30ba GN |
2623 | u16 tss_selector, u16 old_tss_sel, |
2624 | ulong old_tss_base, struct desc_struct *new_desc) | |
2625 | { | |
7b105ca2 | 2626 | struct x86_emulate_ops *ops = ctxt->ops; |
38ba30ba GN |
2627 | struct tss_segment_32 tss_seg; |
2628 | int ret; | |
bcc55cba | 2629 | u32 new_tss_base = get_desc_base(new_desc); |
38ba30ba | 2630 | |
0f65dd70 | 2631 | ret = ops->read_std(ctxt, old_tss_base, &tss_seg, sizeof tss_seg, |
bcc55cba | 2632 | &ctxt->exception); |
db297e3d | 2633 | if (ret != X86EMUL_CONTINUE) |
38ba30ba | 2634 | /* FIXME: need to provide precise fault address */ |
38ba30ba | 2635 | return ret; |
38ba30ba | 2636 | |
7b105ca2 | 2637 | save_state_to_tss32(ctxt, &tss_seg); |
38ba30ba | 2638 | |
0f65dd70 | 2639 | ret = ops->write_std(ctxt, old_tss_base, &tss_seg, sizeof tss_seg, |
bcc55cba | 2640 | &ctxt->exception); |
db297e3d | 2641 | if (ret != X86EMUL_CONTINUE) |
38ba30ba | 2642 | /* FIXME: need to provide precise fault address */ |
38ba30ba | 2643 | return ret; |
38ba30ba | 2644 | |
0f65dd70 | 2645 | ret = ops->read_std(ctxt, new_tss_base, &tss_seg, sizeof tss_seg, |
bcc55cba | 2646 | &ctxt->exception); |
db297e3d | 2647 | if (ret != X86EMUL_CONTINUE) |
38ba30ba | 2648 | /* FIXME: need to provide precise fault address */ |
38ba30ba | 2649 | return ret; |
38ba30ba GN |
2650 | |
2651 | if (old_tss_sel != 0xffff) { | |
2652 | tss_seg.prev_task_link = old_tss_sel; | |
2653 | ||
0f65dd70 | 2654 | ret = ops->write_std(ctxt, new_tss_base, |
38ba30ba GN |
2655 | &tss_seg.prev_task_link, |
2656 | sizeof tss_seg.prev_task_link, | |
0f65dd70 | 2657 | &ctxt->exception); |
db297e3d | 2658 | if (ret != X86EMUL_CONTINUE) |
38ba30ba | 2659 | /* FIXME: need to provide precise fault address */ |
38ba30ba | 2660 | return ret; |
38ba30ba GN |
2661 | } |
2662 | ||
7b105ca2 | 2663 | return load_state_from_tss32(ctxt, &tss_seg); |
38ba30ba GN |
2664 | } |
2665 | ||
2666 | static int emulator_do_task_switch(struct x86_emulate_ctxt *ctxt, | |
7f3d35fd | 2667 | u16 tss_selector, int idt_index, int reason, |
e269fb21 | 2668 | bool has_error_code, u32 error_code) |
38ba30ba | 2669 | { |
7b105ca2 | 2670 | struct x86_emulate_ops *ops = ctxt->ops; |
38ba30ba GN |
2671 | struct desc_struct curr_tss_desc, next_tss_desc; |
2672 | int ret; | |
1aa36616 | 2673 | u16 old_tss_sel = get_segment_selector(ctxt, VCPU_SREG_TR); |
38ba30ba | 2674 | ulong old_tss_base = |
4bff1e86 | 2675 | ops->get_cached_segment_base(ctxt, VCPU_SREG_TR); |
ceffb459 | 2676 | u32 desc_limit; |
e919464b | 2677 | ulong desc_addr; |
38ba30ba GN |
2678 | |
2679 | /* FIXME: old_tss_base == ~0 ? */ | |
2680 | ||
e919464b | 2681 | ret = read_segment_descriptor(ctxt, tss_selector, &next_tss_desc, &desc_addr); |
38ba30ba GN |
2682 | if (ret != X86EMUL_CONTINUE) |
2683 | return ret; | |
e919464b | 2684 | ret = read_segment_descriptor(ctxt, old_tss_sel, &curr_tss_desc, &desc_addr); |
38ba30ba GN |
2685 | if (ret != X86EMUL_CONTINUE) |
2686 | return ret; | |
2687 | ||
2688 | /* FIXME: check that next_tss_desc is tss */ | |
2689 | ||
7f3d35fd KW |
2690 | /* |
2691 | * Check privileges. The three cases are task switch caused by... | |
2692 | * | |
2693 | * 1. jmp/call/int to task gate: Check against DPL of the task gate | |
2694 | * 2. Exception/IRQ/iret: No check is performed | |
fc058680 | 2695 | * 3. jmp/call to TSS: Check against DPL of the TSS |
7f3d35fd KW |
2696 | */ |
2697 | if (reason == TASK_SWITCH_GATE) { | |
2698 | if (idt_index != -1) { | |
2699 | /* Software interrupts */ | |
2700 | struct desc_struct task_gate_desc; | |
2701 | int dpl; | |
2702 | ||
2703 | ret = read_interrupt_descriptor(ctxt, idt_index, | |
2704 | &task_gate_desc); | |
2705 | if (ret != X86EMUL_CONTINUE) | |
2706 | return ret; | |
2707 | ||
2708 | dpl = task_gate_desc.dpl; | |
2709 | if ((tss_selector & 3) > dpl || ops->cpl(ctxt) > dpl) | |
2710 | return emulate_gp(ctxt, (idt_index << 3) | 0x2); | |
2711 | } | |
2712 | } else if (reason != TASK_SWITCH_IRET) { | |
2713 | int dpl = next_tss_desc.dpl; | |
2714 | if ((tss_selector & 3) > dpl || ops->cpl(ctxt) > dpl) | |
2715 | return emulate_gp(ctxt, tss_selector); | |
38ba30ba GN |
2716 | } |
2717 | ||
7f3d35fd | 2718 | |
ceffb459 GN |
2719 | desc_limit = desc_limit_scaled(&next_tss_desc); |
2720 | if (!next_tss_desc.p || | |
2721 | ((desc_limit < 0x67 && (next_tss_desc.type & 8)) || | |
2722 | desc_limit < 0x2b)) { | |
54b8486f | 2723 | emulate_ts(ctxt, tss_selector & 0xfffc); |
38ba30ba GN |
2724 | return X86EMUL_PROPAGATE_FAULT; |
2725 | } | |
2726 | ||
2727 | if (reason == TASK_SWITCH_IRET || reason == TASK_SWITCH_JMP) { | |
2728 | curr_tss_desc.type &= ~(1 << 1); /* clear busy flag */ | |
7b105ca2 | 2729 | write_segment_descriptor(ctxt, old_tss_sel, &curr_tss_desc); |
38ba30ba GN |
2730 | } |
2731 | ||
2732 | if (reason == TASK_SWITCH_IRET) | |
2733 | ctxt->eflags = ctxt->eflags & ~X86_EFLAGS_NT; | |
2734 | ||
2735 | /* set back link to prev task only if NT bit is set in eflags | |
fc058680 | 2736 | note that old_tss_sel is not used after this point */ |
38ba30ba GN |
2737 | if (reason != TASK_SWITCH_CALL && reason != TASK_SWITCH_GATE) |
2738 | old_tss_sel = 0xffff; | |
2739 | ||
2740 | if (next_tss_desc.type & 8) | |
7b105ca2 | 2741 | ret = task_switch_32(ctxt, tss_selector, old_tss_sel, |
38ba30ba GN |
2742 | old_tss_base, &next_tss_desc); |
2743 | else | |
7b105ca2 | 2744 | ret = task_switch_16(ctxt, tss_selector, old_tss_sel, |
38ba30ba | 2745 | old_tss_base, &next_tss_desc); |
0760d448 JK |
2746 | if (ret != X86EMUL_CONTINUE) |
2747 | return ret; | |
38ba30ba GN |
2748 | |
2749 | if (reason == TASK_SWITCH_CALL || reason == TASK_SWITCH_GATE) | |
2750 | ctxt->eflags = ctxt->eflags | X86_EFLAGS_NT; | |
2751 | ||
2752 | if (reason != TASK_SWITCH_IRET) { | |
2753 | next_tss_desc.type |= (1 << 1); /* set busy flag */ | |
7b105ca2 | 2754 | write_segment_descriptor(ctxt, tss_selector, &next_tss_desc); |
38ba30ba GN |
2755 | } |
2756 | ||
717746e3 | 2757 | ops->set_cr(ctxt, 0, ops->get_cr(ctxt, 0) | X86_CR0_TS); |
1aa36616 | 2758 | ops->set_segment(ctxt, tss_selector, &next_tss_desc, 0, VCPU_SREG_TR); |
38ba30ba | 2759 | |
e269fb21 | 2760 | if (has_error_code) { |
9dac77fa AK |
2761 | ctxt->op_bytes = ctxt->ad_bytes = (next_tss_desc.type & 8) ? 4 : 2; |
2762 | ctxt->lock_prefix = 0; | |
2763 | ctxt->src.val = (unsigned long) error_code; | |
4487b3b4 | 2764 | ret = em_push(ctxt); |
e269fb21 JK |
2765 | } |
2766 | ||
38ba30ba GN |
2767 | return ret; |
2768 | } | |
2769 | ||
2770 | int emulator_task_switch(struct x86_emulate_ctxt *ctxt, | |
7f3d35fd | 2771 | u16 tss_selector, int idt_index, int reason, |
e269fb21 | 2772 | bool has_error_code, u32 error_code) |
38ba30ba | 2773 | { |
38ba30ba GN |
2774 | int rc; |
2775 | ||
dd856efa | 2776 | invalidate_registers(ctxt); |
9dac77fa AK |
2777 | ctxt->_eip = ctxt->eip; |
2778 | ctxt->dst.type = OP_NONE; | |
38ba30ba | 2779 | |
7f3d35fd | 2780 | rc = emulator_do_task_switch(ctxt, tss_selector, idt_index, reason, |
e269fb21 | 2781 | has_error_code, error_code); |
38ba30ba | 2782 | |
dd856efa | 2783 | if (rc == X86EMUL_CONTINUE) { |
9dac77fa | 2784 | ctxt->eip = ctxt->_eip; |
dd856efa AK |
2785 | writeback_registers(ctxt); |
2786 | } | |
38ba30ba | 2787 | |
a0c0ab2f | 2788 | return (rc == X86EMUL_UNHANDLEABLE) ? EMULATION_FAILED : EMULATION_OK; |
38ba30ba GN |
2789 | } |
2790 | ||
90de84f5 | 2791 | static void string_addr_inc(struct x86_emulate_ctxt *ctxt, unsigned seg, |
d9271123 | 2792 | int reg, struct operand *op) |
a682e354 | 2793 | { |
a682e354 GN |
2794 | int df = (ctxt->eflags & EFLG_DF) ? -1 : 1; |
2795 | ||
dd856efa AK |
2796 | register_address_increment(ctxt, reg_rmw(ctxt, reg), df * op->bytes); |
2797 | op->addr.mem.ea = register_address(ctxt, reg_read(ctxt, reg)); | |
90de84f5 | 2798 | op->addr.mem.seg = seg; |
a682e354 GN |
2799 | } |
2800 | ||
7af04fc0 AK |
2801 | static int em_das(struct x86_emulate_ctxt *ctxt) |
2802 | { | |
7af04fc0 AK |
2803 | u8 al, old_al; |
2804 | bool af, cf, old_cf; | |
2805 | ||
2806 | cf = ctxt->eflags & X86_EFLAGS_CF; | |
9dac77fa | 2807 | al = ctxt->dst.val; |
7af04fc0 AK |
2808 | |
2809 | old_al = al; | |
2810 | old_cf = cf; | |
2811 | cf = false; | |
2812 | af = ctxt->eflags & X86_EFLAGS_AF; | |
2813 | if ((al & 0x0f) > 9 || af) { | |
2814 | al -= 6; | |
2815 | cf = old_cf | (al >= 250); | |
2816 | af = true; | |
2817 | } else { | |
2818 | af = false; | |
2819 | } | |
2820 | if (old_al > 0x99 || old_cf) { | |
2821 | al -= 0x60; | |
2822 | cf = true; | |
2823 | } | |
2824 | ||
9dac77fa | 2825 | ctxt->dst.val = al; |
7af04fc0 | 2826 | /* Set PF, ZF, SF */ |
9dac77fa AK |
2827 | ctxt->src.type = OP_IMM; |
2828 | ctxt->src.val = 0; | |
2829 | ctxt->src.bytes = 1; | |
a31b9cea | 2830 | emulate_2op_SrcV(ctxt, "or"); |
7af04fc0 AK |
2831 | ctxt->eflags &= ~(X86_EFLAGS_AF | X86_EFLAGS_CF); |
2832 | if (cf) | |
2833 | ctxt->eflags |= X86_EFLAGS_CF; | |
2834 | if (af) | |
2835 | ctxt->eflags |= X86_EFLAGS_AF; | |
2836 | return X86EMUL_CONTINUE; | |
2837 | } | |
2838 | ||
d4ddafcd TY |
2839 | static int em_call(struct x86_emulate_ctxt *ctxt) |
2840 | { | |
2841 | long rel = ctxt->src.val; | |
2842 | ||
2843 | ctxt->src.val = (unsigned long)ctxt->_eip; | |
2844 | jmp_rel(ctxt, rel); | |
2845 | return em_push(ctxt); | |
2846 | } | |
2847 | ||
0ef753b8 AK |
2848 | static int em_call_far(struct x86_emulate_ctxt *ctxt) |
2849 | { | |
0ef753b8 AK |
2850 | u16 sel, old_cs; |
2851 | ulong old_eip; | |
2852 | int rc; | |
2853 | ||
1aa36616 | 2854 | old_cs = get_segment_selector(ctxt, VCPU_SREG_CS); |
9dac77fa | 2855 | old_eip = ctxt->_eip; |
0ef753b8 | 2856 | |
9dac77fa | 2857 | memcpy(&sel, ctxt->src.valptr + ctxt->op_bytes, 2); |
7b105ca2 | 2858 | if (load_segment_descriptor(ctxt, sel, VCPU_SREG_CS)) |
0ef753b8 AK |
2859 | return X86EMUL_CONTINUE; |
2860 | ||
9dac77fa AK |
2861 | ctxt->_eip = 0; |
2862 | memcpy(&ctxt->_eip, ctxt->src.valptr, ctxt->op_bytes); | |
0ef753b8 | 2863 | |
9dac77fa | 2864 | ctxt->src.val = old_cs; |
4487b3b4 | 2865 | rc = em_push(ctxt); |
0ef753b8 AK |
2866 | if (rc != X86EMUL_CONTINUE) |
2867 | return rc; | |
2868 | ||
9dac77fa | 2869 | ctxt->src.val = old_eip; |
4487b3b4 | 2870 | return em_push(ctxt); |
0ef753b8 AK |
2871 | } |
2872 | ||
40ece7c7 AK |
2873 | static int em_ret_near_imm(struct x86_emulate_ctxt *ctxt) |
2874 | { | |
40ece7c7 AK |
2875 | int rc; |
2876 | ||
9dac77fa AK |
2877 | ctxt->dst.type = OP_REG; |
2878 | ctxt->dst.addr.reg = &ctxt->_eip; | |
2879 | ctxt->dst.bytes = ctxt->op_bytes; | |
2880 | rc = emulate_pop(ctxt, &ctxt->dst.val, ctxt->op_bytes); | |
40ece7c7 AK |
2881 | if (rc != X86EMUL_CONTINUE) |
2882 | return rc; | |
5ad105e5 | 2883 | rsp_increment(ctxt, ctxt->src.val); |
40ece7c7 AK |
2884 | return X86EMUL_CONTINUE; |
2885 | } | |
2886 | ||
d67fc27a TY |
2887 | static int em_add(struct x86_emulate_ctxt *ctxt) |
2888 | { | |
a31b9cea | 2889 | emulate_2op_SrcV(ctxt, "add"); |
d67fc27a TY |
2890 | return X86EMUL_CONTINUE; |
2891 | } | |
2892 | ||
2893 | static int em_or(struct x86_emulate_ctxt *ctxt) | |
2894 | { | |
a31b9cea | 2895 | emulate_2op_SrcV(ctxt, "or"); |
d67fc27a TY |
2896 | return X86EMUL_CONTINUE; |
2897 | } | |
2898 | ||
2899 | static int em_adc(struct x86_emulate_ctxt *ctxt) | |
2900 | { | |
a31b9cea | 2901 | emulate_2op_SrcV(ctxt, "adc"); |
d67fc27a TY |
2902 | return X86EMUL_CONTINUE; |
2903 | } | |
2904 | ||
2905 | static int em_sbb(struct x86_emulate_ctxt *ctxt) | |
2906 | { | |
a31b9cea | 2907 | emulate_2op_SrcV(ctxt, "sbb"); |
d67fc27a TY |
2908 | return X86EMUL_CONTINUE; |
2909 | } | |
2910 | ||
2911 | static int em_and(struct x86_emulate_ctxt *ctxt) | |
2912 | { | |
a31b9cea | 2913 | emulate_2op_SrcV(ctxt, "and"); |
d67fc27a TY |
2914 | return X86EMUL_CONTINUE; |
2915 | } | |
2916 | ||
2917 | static int em_sub(struct x86_emulate_ctxt *ctxt) | |
2918 | { | |
a31b9cea | 2919 | emulate_2op_SrcV(ctxt, "sub"); |
d67fc27a TY |
2920 | return X86EMUL_CONTINUE; |
2921 | } | |
2922 | ||
2923 | static int em_xor(struct x86_emulate_ctxt *ctxt) | |
2924 | { | |
a31b9cea | 2925 | emulate_2op_SrcV(ctxt, "xor"); |
d67fc27a TY |
2926 | return X86EMUL_CONTINUE; |
2927 | } | |
2928 | ||
2929 | static int em_cmp(struct x86_emulate_ctxt *ctxt) | |
2930 | { | |
a31b9cea | 2931 | emulate_2op_SrcV(ctxt, "cmp"); |
d67fc27a | 2932 | /* Disable writeback. */ |
9dac77fa | 2933 | ctxt->dst.type = OP_NONE; |
d67fc27a TY |
2934 | return X86EMUL_CONTINUE; |
2935 | } | |
2936 | ||
9f21ca59 TY |
2937 | static int em_test(struct x86_emulate_ctxt *ctxt) |
2938 | { | |
a31b9cea | 2939 | emulate_2op_SrcV(ctxt, "test"); |
caa8a168 AK |
2940 | /* Disable writeback. */ |
2941 | ctxt->dst.type = OP_NONE; | |
9f21ca59 TY |
2942 | return X86EMUL_CONTINUE; |
2943 | } | |
2944 | ||
e4f973ae TY |
2945 | static int em_xchg(struct x86_emulate_ctxt *ctxt) |
2946 | { | |
e4f973ae | 2947 | /* Write back the register source. */ |
9dac77fa AK |
2948 | ctxt->src.val = ctxt->dst.val; |
2949 | write_register_operand(&ctxt->src); | |
e4f973ae TY |
2950 | |
2951 | /* Write back the memory destination with implicit LOCK prefix. */ | |
9dac77fa AK |
2952 | ctxt->dst.val = ctxt->src.orig_val; |
2953 | ctxt->lock_prefix = 1; | |
e4f973ae TY |
2954 | return X86EMUL_CONTINUE; |
2955 | } | |
2956 | ||
5c82aa29 | 2957 | static int em_imul(struct x86_emulate_ctxt *ctxt) |
f3a1b9f4 | 2958 | { |
a31b9cea | 2959 | emulate_2op_SrcV_nobyte(ctxt, "imul"); |
f3a1b9f4 AK |
2960 | return X86EMUL_CONTINUE; |
2961 | } | |
2962 | ||
5c82aa29 AK |
2963 | static int em_imul_3op(struct x86_emulate_ctxt *ctxt) |
2964 | { | |
9dac77fa | 2965 | ctxt->dst.val = ctxt->src2.val; |
5c82aa29 AK |
2966 | return em_imul(ctxt); |
2967 | } | |
2968 | ||
61429142 AK |
2969 | static int em_cwd(struct x86_emulate_ctxt *ctxt) |
2970 | { | |
9dac77fa AK |
2971 | ctxt->dst.type = OP_REG; |
2972 | ctxt->dst.bytes = ctxt->src.bytes; | |
dd856efa | 2973 | ctxt->dst.addr.reg = reg_rmw(ctxt, VCPU_REGS_RDX); |
9dac77fa | 2974 | ctxt->dst.val = ~((ctxt->src.val >> (ctxt->src.bytes * 8 - 1)) - 1); |
61429142 AK |
2975 | |
2976 | return X86EMUL_CONTINUE; | |
2977 | } | |
2978 | ||
48bb5d3c AK |
2979 | static int em_rdtsc(struct x86_emulate_ctxt *ctxt) |
2980 | { | |
48bb5d3c AK |
2981 | u64 tsc = 0; |
2982 | ||
717746e3 | 2983 | ctxt->ops->get_msr(ctxt, MSR_IA32_TSC, &tsc); |
dd856efa AK |
2984 | *reg_write(ctxt, VCPU_REGS_RAX) = (u32)tsc; |
2985 | *reg_write(ctxt, VCPU_REGS_RDX) = tsc >> 32; | |
48bb5d3c AK |
2986 | return X86EMUL_CONTINUE; |
2987 | } | |
2988 | ||
222d21aa AK |
2989 | static int em_rdpmc(struct x86_emulate_ctxt *ctxt) |
2990 | { | |
2991 | u64 pmc; | |
2992 | ||
dd856efa | 2993 | if (ctxt->ops->read_pmc(ctxt, reg_read(ctxt, VCPU_REGS_RCX), &pmc)) |
222d21aa | 2994 | return emulate_gp(ctxt, 0); |
dd856efa AK |
2995 | *reg_write(ctxt, VCPU_REGS_RAX) = (u32)pmc; |
2996 | *reg_write(ctxt, VCPU_REGS_RDX) = pmc >> 32; | |
222d21aa AK |
2997 | return X86EMUL_CONTINUE; |
2998 | } | |
2999 | ||
b9eac5f4 AK |
3000 | static int em_mov(struct x86_emulate_ctxt *ctxt) |
3001 | { | |
49597d81 | 3002 | memcpy(ctxt->dst.valptr, ctxt->src.valptr, ctxt->op_bytes); |
b9eac5f4 AK |
3003 | return X86EMUL_CONTINUE; |
3004 | } | |
3005 | ||
bc00f8d2 TY |
3006 | static int em_cr_write(struct x86_emulate_ctxt *ctxt) |
3007 | { | |
3008 | if (ctxt->ops->set_cr(ctxt, ctxt->modrm_reg, ctxt->src.val)) | |
3009 | return emulate_gp(ctxt, 0); | |
3010 | ||
3011 | /* Disable writeback. */ | |
3012 | ctxt->dst.type = OP_NONE; | |
3013 | return X86EMUL_CONTINUE; | |
3014 | } | |
3015 | ||
3016 | static int em_dr_write(struct x86_emulate_ctxt *ctxt) | |
3017 | { | |
3018 | unsigned long val; | |
3019 | ||
3020 | if (ctxt->mode == X86EMUL_MODE_PROT64) | |
3021 | val = ctxt->src.val & ~0ULL; | |
3022 | else | |
3023 | val = ctxt->src.val & ~0U; | |
3024 | ||
3025 | /* #UD condition is already handled. */ | |
3026 | if (ctxt->ops->set_dr(ctxt, ctxt->modrm_reg, val) < 0) | |
3027 | return emulate_gp(ctxt, 0); | |
3028 | ||
3029 | /* Disable writeback. */ | |
3030 | ctxt->dst.type = OP_NONE; | |
3031 | return X86EMUL_CONTINUE; | |
3032 | } | |
3033 | ||
e1e210b0 TY |
3034 | static int em_wrmsr(struct x86_emulate_ctxt *ctxt) |
3035 | { | |
3036 | u64 msr_data; | |
3037 | ||
dd856efa AK |
3038 | msr_data = (u32)reg_read(ctxt, VCPU_REGS_RAX) |
3039 | | ((u64)reg_read(ctxt, VCPU_REGS_RDX) << 32); | |
3040 | if (ctxt->ops->set_msr(ctxt, reg_read(ctxt, VCPU_REGS_RCX), msr_data)) | |
e1e210b0 TY |
3041 | return emulate_gp(ctxt, 0); |
3042 | ||
3043 | return X86EMUL_CONTINUE; | |
3044 | } | |
3045 | ||
3046 | static int em_rdmsr(struct x86_emulate_ctxt *ctxt) | |
3047 | { | |
3048 | u64 msr_data; | |
3049 | ||
dd856efa | 3050 | if (ctxt->ops->get_msr(ctxt, reg_read(ctxt, VCPU_REGS_RCX), &msr_data)) |
e1e210b0 TY |
3051 | return emulate_gp(ctxt, 0); |
3052 | ||
dd856efa AK |
3053 | *reg_write(ctxt, VCPU_REGS_RAX) = (u32)msr_data; |
3054 | *reg_write(ctxt, VCPU_REGS_RDX) = msr_data >> 32; | |
e1e210b0 TY |
3055 | return X86EMUL_CONTINUE; |
3056 | } | |
3057 | ||
1bd5f469 TY |
3058 | static int em_mov_rm_sreg(struct x86_emulate_ctxt *ctxt) |
3059 | { | |
9dac77fa | 3060 | if (ctxt->modrm_reg > VCPU_SREG_GS) |
1bd5f469 TY |
3061 | return emulate_ud(ctxt); |
3062 | ||
9dac77fa | 3063 | ctxt->dst.val = get_segment_selector(ctxt, ctxt->modrm_reg); |
1bd5f469 TY |
3064 | return X86EMUL_CONTINUE; |
3065 | } | |
3066 | ||
3067 | static int em_mov_sreg_rm(struct x86_emulate_ctxt *ctxt) | |
3068 | { | |
9dac77fa | 3069 | u16 sel = ctxt->src.val; |
1bd5f469 | 3070 | |
9dac77fa | 3071 | if (ctxt->modrm_reg == VCPU_SREG_CS || ctxt->modrm_reg > VCPU_SREG_GS) |
1bd5f469 TY |
3072 | return emulate_ud(ctxt); |
3073 | ||
9dac77fa | 3074 | if (ctxt->modrm_reg == VCPU_SREG_SS) |
1bd5f469 TY |
3075 | ctxt->interruptibility = KVM_X86_SHADOW_INT_MOV_SS; |
3076 | ||
3077 | /* Disable writeback. */ | |
9dac77fa AK |
3078 | ctxt->dst.type = OP_NONE; |
3079 | return load_segment_descriptor(ctxt, sel, ctxt->modrm_reg); | |
1bd5f469 TY |
3080 | } |
3081 | ||
a14e579f AK |
3082 | static int em_lldt(struct x86_emulate_ctxt *ctxt) |
3083 | { | |
3084 | u16 sel = ctxt->src.val; | |
3085 | ||
3086 | /* Disable writeback. */ | |
3087 | ctxt->dst.type = OP_NONE; | |
3088 | return load_segment_descriptor(ctxt, sel, VCPU_SREG_LDTR); | |
3089 | } | |
3090 | ||
80890006 AK |
3091 | static int em_ltr(struct x86_emulate_ctxt *ctxt) |
3092 | { | |
3093 | u16 sel = ctxt->src.val; | |
3094 | ||
3095 | /* Disable writeback. */ | |
3096 | ctxt->dst.type = OP_NONE; | |
3097 | return load_segment_descriptor(ctxt, sel, VCPU_SREG_TR); | |
3098 | } | |
3099 | ||
38503911 AK |
3100 | static int em_invlpg(struct x86_emulate_ctxt *ctxt) |
3101 | { | |
9fa088f4 AK |
3102 | int rc; |
3103 | ulong linear; | |
3104 | ||
9dac77fa | 3105 | rc = linearize(ctxt, ctxt->src.addr.mem, 1, false, &linear); |
9fa088f4 | 3106 | if (rc == X86EMUL_CONTINUE) |
3cb16fe7 | 3107 | ctxt->ops->invlpg(ctxt, linear); |
38503911 | 3108 | /* Disable writeback. */ |
9dac77fa | 3109 | ctxt->dst.type = OP_NONE; |
38503911 AK |
3110 | return X86EMUL_CONTINUE; |
3111 | } | |
3112 | ||
2d04a05b AK |
3113 | static int em_clts(struct x86_emulate_ctxt *ctxt) |
3114 | { | |
3115 | ulong cr0; | |
3116 | ||
3117 | cr0 = ctxt->ops->get_cr(ctxt, 0); | |
3118 | cr0 &= ~X86_CR0_TS; | |
3119 | ctxt->ops->set_cr(ctxt, 0, cr0); | |
3120 | return X86EMUL_CONTINUE; | |
3121 | } | |
3122 | ||
26d05cc7 AK |
3123 | static int em_vmcall(struct x86_emulate_ctxt *ctxt) |
3124 | { | |
26d05cc7 AK |
3125 | int rc; |
3126 | ||
9dac77fa | 3127 | if (ctxt->modrm_mod != 3 || ctxt->modrm_rm != 1) |
26d05cc7 AK |
3128 | return X86EMUL_UNHANDLEABLE; |
3129 | ||
3130 | rc = ctxt->ops->fix_hypercall(ctxt); | |
3131 | if (rc != X86EMUL_CONTINUE) | |
3132 | return rc; | |
3133 | ||
3134 | /* Let the processor re-execute the fixed hypercall */ | |
9dac77fa | 3135 | ctxt->_eip = ctxt->eip; |
26d05cc7 | 3136 | /* Disable writeback. */ |
9dac77fa | 3137 | ctxt->dst.type = OP_NONE; |
26d05cc7 AK |
3138 | return X86EMUL_CONTINUE; |
3139 | } | |
3140 | ||
96051572 AK |
3141 | static int emulate_store_desc_ptr(struct x86_emulate_ctxt *ctxt, |
3142 | void (*get)(struct x86_emulate_ctxt *ctxt, | |
3143 | struct desc_ptr *ptr)) | |
3144 | { | |
3145 | struct desc_ptr desc_ptr; | |
3146 | ||
3147 | if (ctxt->mode == X86EMUL_MODE_PROT64) | |
3148 | ctxt->op_bytes = 8; | |
3149 | get(ctxt, &desc_ptr); | |
3150 | if (ctxt->op_bytes == 2) { | |
3151 | ctxt->op_bytes = 4; | |
3152 | desc_ptr.address &= 0x00ffffff; | |
3153 | } | |
3154 | /* Disable writeback. */ | |
3155 | ctxt->dst.type = OP_NONE; | |
3156 | return segmented_write(ctxt, ctxt->dst.addr.mem, | |
3157 | &desc_ptr, 2 + ctxt->op_bytes); | |
3158 | } | |
3159 | ||
3160 | static int em_sgdt(struct x86_emulate_ctxt *ctxt) | |
3161 | { | |
3162 | return emulate_store_desc_ptr(ctxt, ctxt->ops->get_gdt); | |
3163 | } | |
3164 | ||
3165 | static int em_sidt(struct x86_emulate_ctxt *ctxt) | |
3166 | { | |
3167 | return emulate_store_desc_ptr(ctxt, ctxt->ops->get_idt); | |
3168 | } | |
3169 | ||
26d05cc7 AK |
3170 | static int em_lgdt(struct x86_emulate_ctxt *ctxt) |
3171 | { | |
26d05cc7 AK |
3172 | struct desc_ptr desc_ptr; |
3173 | int rc; | |
3174 | ||
510425ff AK |
3175 | if (ctxt->mode == X86EMUL_MODE_PROT64) |
3176 | ctxt->op_bytes = 8; | |
9dac77fa | 3177 | rc = read_descriptor(ctxt, ctxt->src.addr.mem, |
26d05cc7 | 3178 | &desc_ptr.size, &desc_ptr.address, |
9dac77fa | 3179 | ctxt->op_bytes); |
26d05cc7 AK |
3180 | if (rc != X86EMUL_CONTINUE) |
3181 | return rc; | |
3182 | ctxt->ops->set_gdt(ctxt, &desc_ptr); | |
3183 | /* Disable writeback. */ | |
9dac77fa | 3184 | ctxt->dst.type = OP_NONE; |
26d05cc7 AK |
3185 | return X86EMUL_CONTINUE; |
3186 | } | |
3187 | ||
5ef39c71 | 3188 | static int em_vmmcall(struct x86_emulate_ctxt *ctxt) |
26d05cc7 | 3189 | { |
26d05cc7 AK |
3190 | int rc; |
3191 | ||
5ef39c71 AK |
3192 | rc = ctxt->ops->fix_hypercall(ctxt); |
3193 | ||
26d05cc7 | 3194 | /* Disable writeback. */ |
9dac77fa | 3195 | ctxt->dst.type = OP_NONE; |
26d05cc7 AK |
3196 | return rc; |
3197 | } | |
3198 | ||
3199 | static int em_lidt(struct x86_emulate_ctxt *ctxt) | |
3200 | { | |
26d05cc7 AK |
3201 | struct desc_ptr desc_ptr; |
3202 | int rc; | |
3203 | ||
510425ff AK |
3204 | if (ctxt->mode == X86EMUL_MODE_PROT64) |
3205 | ctxt->op_bytes = 8; | |
9dac77fa | 3206 | rc = read_descriptor(ctxt, ctxt->src.addr.mem, |
509cf9fe | 3207 | &desc_ptr.size, &desc_ptr.address, |
9dac77fa | 3208 | ctxt->op_bytes); |
26d05cc7 AK |
3209 | if (rc != X86EMUL_CONTINUE) |
3210 | return rc; | |
3211 | ctxt->ops->set_idt(ctxt, &desc_ptr); | |
3212 | /* Disable writeback. */ | |
9dac77fa | 3213 | ctxt->dst.type = OP_NONE; |
26d05cc7 AK |
3214 | return X86EMUL_CONTINUE; |
3215 | } | |
3216 | ||
3217 | static int em_smsw(struct x86_emulate_ctxt *ctxt) | |
3218 | { | |
9dac77fa AK |
3219 | ctxt->dst.bytes = 2; |
3220 | ctxt->dst.val = ctxt->ops->get_cr(ctxt, 0); | |
26d05cc7 AK |
3221 | return X86EMUL_CONTINUE; |
3222 | } | |
3223 | ||
3224 | static int em_lmsw(struct x86_emulate_ctxt *ctxt) | |
3225 | { | |
26d05cc7 | 3226 | ctxt->ops->set_cr(ctxt, 0, (ctxt->ops->get_cr(ctxt, 0) & ~0x0eul) |
9dac77fa AK |
3227 | | (ctxt->src.val & 0x0f)); |
3228 | ctxt->dst.type = OP_NONE; | |
26d05cc7 AK |
3229 | return X86EMUL_CONTINUE; |
3230 | } | |
3231 | ||
d06e03ad TY |
3232 | static int em_loop(struct x86_emulate_ctxt *ctxt) |
3233 | { | |
dd856efa AK |
3234 | register_address_increment(ctxt, reg_rmw(ctxt, VCPU_REGS_RCX), -1); |
3235 | if ((address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) != 0) && | |
9dac77fa AK |
3236 | (ctxt->b == 0xe2 || test_cc(ctxt->b ^ 0x5, ctxt->eflags))) |
3237 | jmp_rel(ctxt, ctxt->src.val); | |
d06e03ad TY |
3238 | |
3239 | return X86EMUL_CONTINUE; | |
3240 | } | |
3241 | ||
3242 | static int em_jcxz(struct x86_emulate_ctxt *ctxt) | |
3243 | { | |
dd856efa | 3244 | if (address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) == 0) |
9dac77fa | 3245 | jmp_rel(ctxt, ctxt->src.val); |
d06e03ad TY |
3246 | |
3247 | return X86EMUL_CONTINUE; | |
3248 | } | |
3249 | ||
d7841a4b TY |
3250 | static int em_in(struct x86_emulate_ctxt *ctxt) |
3251 | { | |
3252 | if (!pio_in_emulated(ctxt, ctxt->dst.bytes, ctxt->src.val, | |
3253 | &ctxt->dst.val)) | |
3254 | return X86EMUL_IO_NEEDED; | |
3255 | ||
3256 | return X86EMUL_CONTINUE; | |
3257 | } | |
3258 | ||
3259 | static int em_out(struct x86_emulate_ctxt *ctxt) | |
3260 | { | |
3261 | ctxt->ops->pio_out_emulated(ctxt, ctxt->src.bytes, ctxt->dst.val, | |
3262 | &ctxt->src.val, 1); | |
3263 | /* Disable writeback. */ | |
3264 | ctxt->dst.type = OP_NONE; | |
3265 | return X86EMUL_CONTINUE; | |
3266 | } | |
3267 | ||
f411e6cd TY |
3268 | static int em_cli(struct x86_emulate_ctxt *ctxt) |
3269 | { | |
3270 | if (emulator_bad_iopl(ctxt)) | |
3271 | return emulate_gp(ctxt, 0); | |
3272 | ||
3273 | ctxt->eflags &= ~X86_EFLAGS_IF; | |
3274 | return X86EMUL_CONTINUE; | |
3275 | } | |
3276 | ||
3277 | static int em_sti(struct x86_emulate_ctxt *ctxt) | |
3278 | { | |
3279 | if (emulator_bad_iopl(ctxt)) | |
3280 | return emulate_gp(ctxt, 0); | |
3281 | ||
3282 | ctxt->interruptibility = KVM_X86_SHADOW_INT_STI; | |
3283 | ctxt->eflags |= X86_EFLAGS_IF; | |
3284 | return X86EMUL_CONTINUE; | |
3285 | } | |
3286 | ||
ce7faab2 TY |
3287 | static int em_bt(struct x86_emulate_ctxt *ctxt) |
3288 | { | |
3289 | /* Disable writeback. */ | |
3290 | ctxt->dst.type = OP_NONE; | |
3291 | /* only subword offset */ | |
3292 | ctxt->src.val &= (ctxt->dst.bytes << 3) - 1; | |
3293 | ||
3294 | emulate_2op_SrcV_nobyte(ctxt, "bt"); | |
3295 | return X86EMUL_CONTINUE; | |
3296 | } | |
3297 | ||
3298 | static int em_bts(struct x86_emulate_ctxt *ctxt) | |
3299 | { | |
3300 | emulate_2op_SrcV_nobyte(ctxt, "bts"); | |
3301 | return X86EMUL_CONTINUE; | |
3302 | } | |
3303 | ||
3304 | static int em_btr(struct x86_emulate_ctxt *ctxt) | |
3305 | { | |
3306 | emulate_2op_SrcV_nobyte(ctxt, "btr"); | |
3307 | return X86EMUL_CONTINUE; | |
3308 | } | |
3309 | ||
3310 | static int em_btc(struct x86_emulate_ctxt *ctxt) | |
3311 | { | |
3312 | emulate_2op_SrcV_nobyte(ctxt, "btc"); | |
3313 | return X86EMUL_CONTINUE; | |
3314 | } | |
3315 | ||
ff227392 TY |
3316 | static int em_bsf(struct x86_emulate_ctxt *ctxt) |
3317 | { | |
d54e4237 | 3318 | emulate_2op_SrcV_nobyte(ctxt, "bsf"); |
ff227392 TY |
3319 | return X86EMUL_CONTINUE; |
3320 | } | |
3321 | ||
3322 | static int em_bsr(struct x86_emulate_ctxt *ctxt) | |
3323 | { | |
d54e4237 | 3324 | emulate_2op_SrcV_nobyte(ctxt, "bsr"); |
ff227392 TY |
3325 | return X86EMUL_CONTINUE; |
3326 | } | |
3327 | ||
6d6eede4 AK |
3328 | static int em_cpuid(struct x86_emulate_ctxt *ctxt) |
3329 | { | |
3330 | u32 eax, ebx, ecx, edx; | |
3331 | ||
dd856efa AK |
3332 | eax = reg_read(ctxt, VCPU_REGS_RAX); |
3333 | ecx = reg_read(ctxt, VCPU_REGS_RCX); | |
6d6eede4 | 3334 | ctxt->ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx); |
dd856efa AK |
3335 | *reg_write(ctxt, VCPU_REGS_RAX) = eax; |
3336 | *reg_write(ctxt, VCPU_REGS_RBX) = ebx; | |
3337 | *reg_write(ctxt, VCPU_REGS_RCX) = ecx; | |
3338 | *reg_write(ctxt, VCPU_REGS_RDX) = edx; | |
6d6eede4 AK |
3339 | return X86EMUL_CONTINUE; |
3340 | } | |
3341 | ||
2dd7caa0 AK |
3342 | static int em_lahf(struct x86_emulate_ctxt *ctxt) |
3343 | { | |
dd856efa AK |
3344 | *reg_rmw(ctxt, VCPU_REGS_RAX) &= ~0xff00UL; |
3345 | *reg_rmw(ctxt, VCPU_REGS_RAX) |= (ctxt->eflags & 0xff) << 8; | |
2dd7caa0 AK |
3346 | return X86EMUL_CONTINUE; |
3347 | } | |
3348 | ||
9299836e AK |
3349 | static int em_bswap(struct x86_emulate_ctxt *ctxt) |
3350 | { | |
3351 | switch (ctxt->op_bytes) { | |
3352 | #ifdef CONFIG_X86_64 | |
3353 | case 8: | |
3354 | asm("bswap %0" : "+r"(ctxt->dst.val)); | |
3355 | break; | |
3356 | #endif | |
3357 | default: | |
3358 | asm("bswap %0" : "+r"(*(u32 *)&ctxt->dst.val)); | |
3359 | break; | |
3360 | } | |
3361 | return X86EMUL_CONTINUE; | |
3362 | } | |
3363 | ||
cfec82cb JR |
3364 | static bool valid_cr(int nr) |
3365 | { | |
3366 | switch (nr) { | |
3367 | case 0: | |
3368 | case 2 ... 4: | |
3369 | case 8: | |
3370 | return true; | |
3371 | default: | |
3372 | return false; | |
3373 | } | |
3374 | } | |
3375 | ||
3376 | static int check_cr_read(struct x86_emulate_ctxt *ctxt) | |
3377 | { | |
9dac77fa | 3378 | if (!valid_cr(ctxt->modrm_reg)) |
cfec82cb JR |
3379 | return emulate_ud(ctxt); |
3380 | ||
3381 | return X86EMUL_CONTINUE; | |
3382 | } | |
3383 | ||
3384 | static int check_cr_write(struct x86_emulate_ctxt *ctxt) | |
3385 | { | |
9dac77fa AK |
3386 | u64 new_val = ctxt->src.val64; |
3387 | int cr = ctxt->modrm_reg; | |
c2ad2bb3 | 3388 | u64 efer = 0; |
cfec82cb JR |
3389 | |
3390 | static u64 cr_reserved_bits[] = { | |
3391 | 0xffffffff00000000ULL, | |
3392 | 0, 0, 0, /* CR3 checked later */ | |
3393 | CR4_RESERVED_BITS, | |
3394 | 0, 0, 0, | |
3395 | CR8_RESERVED_BITS, | |
3396 | }; | |
3397 | ||
3398 | if (!valid_cr(cr)) | |
3399 | return emulate_ud(ctxt); | |
3400 | ||
3401 | if (new_val & cr_reserved_bits[cr]) | |
3402 | return emulate_gp(ctxt, 0); | |
3403 | ||
3404 | switch (cr) { | |
3405 | case 0: { | |
c2ad2bb3 | 3406 | u64 cr4; |
cfec82cb JR |
3407 | if (((new_val & X86_CR0_PG) && !(new_val & X86_CR0_PE)) || |
3408 | ((new_val & X86_CR0_NW) && !(new_val & X86_CR0_CD))) | |
3409 | return emulate_gp(ctxt, 0); | |
3410 | ||
717746e3 AK |
3411 | cr4 = ctxt->ops->get_cr(ctxt, 4); |
3412 | ctxt->ops->get_msr(ctxt, MSR_EFER, &efer); | |
cfec82cb JR |
3413 | |
3414 | if ((new_val & X86_CR0_PG) && (efer & EFER_LME) && | |
3415 | !(cr4 & X86_CR4_PAE)) | |
3416 | return emulate_gp(ctxt, 0); | |
3417 | ||
3418 | break; | |
3419 | } | |
3420 | case 3: { | |
3421 | u64 rsvd = 0; | |
3422 | ||
c2ad2bb3 AK |
3423 | ctxt->ops->get_msr(ctxt, MSR_EFER, &efer); |
3424 | if (efer & EFER_LMA) | |
cfec82cb | 3425 | rsvd = CR3_L_MODE_RESERVED_BITS; |
fd72c419 | 3426 | else if (ctxt->ops->get_cr(ctxt, 4) & X86_CR4_PAE) |
cfec82cb | 3427 | rsvd = CR3_PAE_RESERVED_BITS; |
fd72c419 | 3428 | else if (ctxt->ops->get_cr(ctxt, 0) & X86_CR0_PG) |
cfec82cb JR |
3429 | rsvd = CR3_NONPAE_RESERVED_BITS; |
3430 | ||
3431 | if (new_val & rsvd) | |
3432 | return emulate_gp(ctxt, 0); | |
3433 | ||
3434 | break; | |
3435 | } | |
3436 | case 4: { | |
717746e3 | 3437 | ctxt->ops->get_msr(ctxt, MSR_EFER, &efer); |
cfec82cb JR |
3438 | |
3439 | if ((efer & EFER_LMA) && !(new_val & X86_CR4_PAE)) | |
3440 | return emulate_gp(ctxt, 0); | |
3441 | ||
3442 | break; | |
3443 | } | |
3444 | } | |
3445 | ||
3446 | return X86EMUL_CONTINUE; | |
3447 | } | |
3448 | ||
3b88e41a JR |
3449 | static int check_dr7_gd(struct x86_emulate_ctxt *ctxt) |
3450 | { | |
3451 | unsigned long dr7; | |
3452 | ||
717746e3 | 3453 | ctxt->ops->get_dr(ctxt, 7, &dr7); |
3b88e41a JR |
3454 | |
3455 | /* Check if DR7.Global_Enable is set */ | |
3456 | return dr7 & (1 << 13); | |
3457 | } | |
3458 | ||
3459 | static int check_dr_read(struct x86_emulate_ctxt *ctxt) | |
3460 | { | |
9dac77fa | 3461 | int dr = ctxt->modrm_reg; |
3b88e41a JR |
3462 | u64 cr4; |
3463 | ||
3464 | if (dr > 7) | |
3465 | return emulate_ud(ctxt); | |
3466 | ||
717746e3 | 3467 | cr4 = ctxt->ops->get_cr(ctxt, 4); |
3b88e41a JR |
3468 | if ((cr4 & X86_CR4_DE) && (dr == 4 || dr == 5)) |
3469 | return emulate_ud(ctxt); | |
3470 | ||
3471 | if (check_dr7_gd(ctxt)) | |
3472 | return emulate_db(ctxt); | |
3473 | ||
3474 | return X86EMUL_CONTINUE; | |
3475 | } | |
3476 | ||
3477 | static int check_dr_write(struct x86_emulate_ctxt *ctxt) | |
3478 | { | |
9dac77fa AK |
3479 | u64 new_val = ctxt->src.val64; |
3480 | int dr = ctxt->modrm_reg; | |
3b88e41a JR |
3481 | |
3482 | if ((dr == 6 || dr == 7) && (new_val & 0xffffffff00000000ULL)) | |
3483 | return emulate_gp(ctxt, 0); | |
3484 | ||
3485 | return check_dr_read(ctxt); | |
3486 | } | |
3487 | ||
01de8b09 JR |
3488 | static int check_svme(struct x86_emulate_ctxt *ctxt) |
3489 | { | |
3490 | u64 efer; | |
3491 | ||
717746e3 | 3492 | ctxt->ops->get_msr(ctxt, MSR_EFER, &efer); |
01de8b09 JR |
3493 | |
3494 | if (!(efer & EFER_SVME)) | |
3495 | return emulate_ud(ctxt); | |
3496 | ||
3497 | return X86EMUL_CONTINUE; | |
3498 | } | |
3499 | ||
3500 | static int check_svme_pa(struct x86_emulate_ctxt *ctxt) | |
3501 | { | |
dd856efa | 3502 | u64 rax = reg_read(ctxt, VCPU_REGS_RAX); |
01de8b09 JR |
3503 | |
3504 | /* Valid physical address? */ | |
d4224449 | 3505 | if (rax & 0xffff000000000000ULL) |
01de8b09 JR |
3506 | return emulate_gp(ctxt, 0); |
3507 | ||
3508 | return check_svme(ctxt); | |
3509 | } | |
3510 | ||
d7eb8203 JR |
3511 | static int check_rdtsc(struct x86_emulate_ctxt *ctxt) |
3512 | { | |
717746e3 | 3513 | u64 cr4 = ctxt->ops->get_cr(ctxt, 4); |
d7eb8203 | 3514 | |
717746e3 | 3515 | if (cr4 & X86_CR4_TSD && ctxt->ops->cpl(ctxt)) |
d7eb8203 JR |
3516 | return emulate_ud(ctxt); |
3517 | ||
3518 | return X86EMUL_CONTINUE; | |
3519 | } | |
3520 | ||
8061252e JR |
3521 | static int check_rdpmc(struct x86_emulate_ctxt *ctxt) |
3522 | { | |
717746e3 | 3523 | u64 cr4 = ctxt->ops->get_cr(ctxt, 4); |
dd856efa | 3524 | u64 rcx = reg_read(ctxt, VCPU_REGS_RCX); |
8061252e | 3525 | |
717746e3 | 3526 | if ((!(cr4 & X86_CR4_PCE) && ctxt->ops->cpl(ctxt)) || |
8061252e JR |
3527 | (rcx > 3)) |
3528 | return emulate_gp(ctxt, 0); | |
3529 | ||
3530 | return X86EMUL_CONTINUE; | |
3531 | } | |
3532 | ||
f6511935 JR |
3533 | static int check_perm_in(struct x86_emulate_ctxt *ctxt) |
3534 | { | |
9dac77fa AK |
3535 | ctxt->dst.bytes = min(ctxt->dst.bytes, 4u); |
3536 | if (!emulator_io_permited(ctxt, ctxt->src.val, ctxt->dst.bytes)) | |
f6511935 JR |
3537 | return emulate_gp(ctxt, 0); |
3538 | ||
3539 | return X86EMUL_CONTINUE; | |
3540 | } | |
3541 | ||
3542 | static int check_perm_out(struct x86_emulate_ctxt *ctxt) | |
3543 | { | |
9dac77fa AK |
3544 | ctxt->src.bytes = min(ctxt->src.bytes, 4u); |
3545 | if (!emulator_io_permited(ctxt, ctxt->dst.val, ctxt->src.bytes)) | |
f6511935 JR |
3546 | return emulate_gp(ctxt, 0); |
3547 | ||
3548 | return X86EMUL_CONTINUE; | |
3549 | } | |
3550 | ||
73fba5f4 | 3551 | #define D(_y) { .flags = (_y) } |
c4f035c6 | 3552 | #define DI(_y, _i) { .flags = (_y), .intercept = x86_intercept_##_i } |
d09beabd JR |
3553 | #define DIP(_y, _i, _p) { .flags = (_y), .intercept = x86_intercept_##_i, \ |
3554 | .check_perm = (_p) } | |
73fba5f4 | 3555 | #define N D(0) |
01de8b09 | 3556 | #define EXT(_f, _e) { .flags = ((_f) | RMExt), .u.group = (_e) } |
1c2545be TY |
3557 | #define G(_f, _g) { .flags = ((_f) | Group | ModRM), .u.group = (_g) } |
3558 | #define GD(_f, _g) { .flags = ((_f) | GroupDual | ModRM), .u.gdual = (_g) } | |
73fba5f4 | 3559 | #define I(_f, _e) { .flags = (_f), .u.execute = (_e) } |
c4f035c6 AK |
3560 | #define II(_f, _e, _i) \ |
3561 | { .flags = (_f), .u.execute = (_e), .intercept = x86_intercept_##_i } | |
d09beabd JR |
3562 | #define IIP(_f, _e, _i, _p) \ |
3563 | { .flags = (_f), .u.execute = (_e), .intercept = x86_intercept_##_i, \ | |
3564 | .check_perm = (_p) } | |
aa97bb48 | 3565 | #define GP(_f, _g) { .flags = ((_f) | Prefix), .u.gprefix = (_g) } |
73fba5f4 | 3566 | |
8d8f4e9f | 3567 | #define D2bv(_f) D((_f) | ByteOp), D(_f) |
f6511935 | 3568 | #define D2bvIP(_f, _i, _p) DIP((_f) | ByteOp, _i, _p), DIP(_f, _i, _p) |
8d8f4e9f | 3569 | #define I2bv(_f, _e) I((_f) | ByteOp, _e), I(_f, _e) |
d7841a4b TY |
3570 | #define I2bvIP(_f, _e, _i, _p) \ |
3571 | IIP((_f) | ByteOp, _e, _i, _p), IIP(_f, _e, _i, _p) | |
8d8f4e9f | 3572 | |
d67fc27a TY |
3573 | #define I6ALU(_f, _e) I2bv((_f) | DstMem | SrcReg | ModRM, _e), \ |
3574 | I2bv(((_f) | DstReg | SrcMem | ModRM) & ~Lock, _e), \ | |
3575 | I2bv(((_f) & ~Lock) | DstAcc | SrcImm, _e) | |
6230f7fc | 3576 | |
d7eb8203 | 3577 | static struct opcode group7_rm1[] = { |
1c2545be TY |
3578 | DI(SrcNone | Priv, monitor), |
3579 | DI(SrcNone | Priv, mwait), | |
d7eb8203 JR |
3580 | N, N, N, N, N, N, |
3581 | }; | |
3582 | ||
01de8b09 | 3583 | static struct opcode group7_rm3[] = { |
1c2545be TY |
3584 | DIP(SrcNone | Prot | Priv, vmrun, check_svme_pa), |
3585 | II(SrcNone | Prot | VendorSpecific, em_vmmcall, vmmcall), | |
3586 | DIP(SrcNone | Prot | Priv, vmload, check_svme_pa), | |
3587 | DIP(SrcNone | Prot | Priv, vmsave, check_svme_pa), | |
3588 | DIP(SrcNone | Prot | Priv, stgi, check_svme), | |
3589 | DIP(SrcNone | Prot | Priv, clgi, check_svme), | |
3590 | DIP(SrcNone | Prot | Priv, skinit, check_svme), | |
3591 | DIP(SrcNone | Prot | Priv, invlpga, check_svme), | |
01de8b09 | 3592 | }; |
6230f7fc | 3593 | |
d7eb8203 JR |
3594 | static struct opcode group7_rm7[] = { |
3595 | N, | |
1c2545be | 3596 | DIP(SrcNone, rdtscp, check_rdtsc), |
d7eb8203 JR |
3597 | N, N, N, N, N, N, |
3598 | }; | |
d67fc27a | 3599 | |
73fba5f4 | 3600 | static struct opcode group1[] = { |
d67fc27a | 3601 | I(Lock, em_add), |
d5ae7ce8 | 3602 | I(Lock | PageTable, em_or), |
d67fc27a TY |
3603 | I(Lock, em_adc), |
3604 | I(Lock, em_sbb), | |
d5ae7ce8 | 3605 | I(Lock | PageTable, em_and), |
d67fc27a TY |
3606 | I(Lock, em_sub), |
3607 | I(Lock, em_xor), | |
3608 | I(0, em_cmp), | |
73fba5f4 AK |
3609 | }; |
3610 | ||
3611 | static struct opcode group1A[] = { | |
1c2545be | 3612 | I(DstMem | SrcNone | Mov | Stack, em_pop), N, N, N, N, N, N, N, |
73fba5f4 AK |
3613 | }; |
3614 | ||
3615 | static struct opcode group3[] = { | |
1c2545be TY |
3616 | I(DstMem | SrcImm, em_test), |
3617 | I(DstMem | SrcImm, em_test), | |
3618 | I(DstMem | SrcNone | Lock, em_not), | |
3619 | I(DstMem | SrcNone | Lock, em_neg), | |
3620 | I(SrcMem, em_mul_ex), | |
3621 | I(SrcMem, em_imul_ex), | |
3622 | I(SrcMem, em_div_ex), | |
3623 | I(SrcMem, em_idiv_ex), | |
73fba5f4 AK |
3624 | }; |
3625 | ||
3626 | static struct opcode group4[] = { | |
1c2545be TY |
3627 | I(ByteOp | DstMem | SrcNone | Lock, em_grp45), |
3628 | I(ByteOp | DstMem | SrcNone | Lock, em_grp45), | |
73fba5f4 AK |
3629 | N, N, N, N, N, N, |
3630 | }; | |
3631 | ||
3632 | static struct opcode group5[] = { | |
1c2545be TY |
3633 | I(DstMem | SrcNone | Lock, em_grp45), |
3634 | I(DstMem | SrcNone | Lock, em_grp45), | |
3635 | I(SrcMem | Stack, em_grp45), | |
3636 | I(SrcMemFAddr | ImplicitOps | Stack, em_call_far), | |
3637 | I(SrcMem | Stack, em_grp45), | |
3638 | I(SrcMemFAddr | ImplicitOps, em_grp45), | |
3639 | I(SrcMem | Stack, em_grp45), N, | |
73fba5f4 AK |
3640 | }; |
3641 | ||
dee6bb70 | 3642 | static struct opcode group6[] = { |
1c2545be TY |
3643 | DI(Prot, sldt), |
3644 | DI(Prot, str), | |
a14e579f | 3645 | II(Prot | Priv | SrcMem16, em_lldt, lldt), |
80890006 | 3646 | II(Prot | Priv | SrcMem16, em_ltr, ltr), |
dee6bb70 JR |
3647 | N, N, N, N, |
3648 | }; | |
3649 | ||
73fba5f4 | 3650 | static struct group_dual group7 = { { |
96051572 AK |
3651 | II(Mov | DstMem | Priv, em_sgdt, sgdt), |
3652 | II(Mov | DstMem | Priv, em_sidt, sidt), | |
1c2545be TY |
3653 | II(SrcMem | Priv, em_lgdt, lgdt), |
3654 | II(SrcMem | Priv, em_lidt, lidt), | |
3655 | II(SrcNone | DstMem | Mov, em_smsw, smsw), N, | |
3656 | II(SrcMem16 | Mov | Priv, em_lmsw, lmsw), | |
3657 | II(SrcMem | ByteOp | Priv | NoAccess, em_invlpg, invlpg), | |
73fba5f4 | 3658 | }, { |
1c2545be | 3659 | I(SrcNone | Priv | VendorSpecific, em_vmcall), |
5ef39c71 | 3660 | EXT(0, group7_rm1), |
01de8b09 | 3661 | N, EXT(0, group7_rm3), |
1c2545be TY |
3662 | II(SrcNone | DstMem | Mov, em_smsw, smsw), N, |
3663 | II(SrcMem16 | Mov | Priv, em_lmsw, lmsw), | |
3664 | EXT(0, group7_rm7), | |
73fba5f4 AK |
3665 | } }; |
3666 | ||
3667 | static struct opcode group8[] = { | |
3668 | N, N, N, N, | |
1c2545be TY |
3669 | I(DstMem | SrcImmByte, em_bt), |
3670 | I(DstMem | SrcImmByte | Lock | PageTable, em_bts), | |
3671 | I(DstMem | SrcImmByte | Lock, em_btr), | |
3672 | I(DstMem | SrcImmByte | Lock | PageTable, em_btc), | |
73fba5f4 AK |
3673 | }; |
3674 | ||
3675 | static struct group_dual group9 = { { | |
1c2545be | 3676 | N, I(DstMem64 | Lock | PageTable, em_cmpxchg8b), N, N, N, N, N, N, |
73fba5f4 AK |
3677 | }, { |
3678 | N, N, N, N, N, N, N, N, | |
3679 | } }; | |
3680 | ||
a4d4a7c1 | 3681 | static struct opcode group11[] = { |
1c2545be | 3682 | I(DstMem | SrcImm | Mov | PageTable, em_mov), |
d5ae7ce8 | 3683 | X7(D(Undefined)), |
a4d4a7c1 AK |
3684 | }; |
3685 | ||
aa97bb48 | 3686 | static struct gprefix pfx_0f_6f_0f_7f = { |
e5971755 | 3687 | I(Mmx, em_mov), I(Sse | Aligned, em_mov), N, I(Sse | Unaligned, em_mov), |
aa97bb48 AK |
3688 | }; |
3689 | ||
3e114eb4 AK |
3690 | static struct gprefix pfx_vmovntpx = { |
3691 | I(0, em_mov), N, N, N, | |
3692 | }; | |
3693 | ||
73fba5f4 AK |
3694 | static struct opcode opcode_table[256] = { |
3695 | /* 0x00 - 0x07 */ | |
d67fc27a | 3696 | I6ALU(Lock, em_add), |
1cd196ea AK |
3697 | I(ImplicitOps | Stack | No64 | Src2ES, em_push_sreg), |
3698 | I(ImplicitOps | Stack | No64 | Src2ES, em_pop_sreg), | |
73fba5f4 | 3699 | /* 0x08 - 0x0F */ |
d5ae7ce8 | 3700 | I6ALU(Lock | PageTable, em_or), |
1cd196ea AK |
3701 | I(ImplicitOps | Stack | No64 | Src2CS, em_push_sreg), |
3702 | N, | |
73fba5f4 | 3703 | /* 0x10 - 0x17 */ |
d67fc27a | 3704 | I6ALU(Lock, em_adc), |
1cd196ea AK |
3705 | I(ImplicitOps | Stack | No64 | Src2SS, em_push_sreg), |
3706 | I(ImplicitOps | Stack | No64 | Src2SS, em_pop_sreg), | |
73fba5f4 | 3707 | /* 0x18 - 0x1F */ |
d67fc27a | 3708 | I6ALU(Lock, em_sbb), |
1cd196ea AK |
3709 | I(ImplicitOps | Stack | No64 | Src2DS, em_push_sreg), |
3710 | I(ImplicitOps | Stack | No64 | Src2DS, em_pop_sreg), | |
73fba5f4 | 3711 | /* 0x20 - 0x27 */ |
d5ae7ce8 | 3712 | I6ALU(Lock | PageTable, em_and), N, N, |
73fba5f4 | 3713 | /* 0x28 - 0x2F */ |
d67fc27a | 3714 | I6ALU(Lock, em_sub), N, I(ByteOp | DstAcc | No64, em_das), |
73fba5f4 | 3715 | /* 0x30 - 0x37 */ |
d67fc27a | 3716 | I6ALU(Lock, em_xor), N, N, |
73fba5f4 | 3717 | /* 0x38 - 0x3F */ |
d67fc27a | 3718 | I6ALU(0, em_cmp), N, N, |
73fba5f4 AK |
3719 | /* 0x40 - 0x4F */ |
3720 | X16(D(DstReg)), | |
3721 | /* 0x50 - 0x57 */ | |
63540382 | 3722 | X8(I(SrcReg | Stack, em_push)), |
73fba5f4 | 3723 | /* 0x58 - 0x5F */ |
c54fe504 | 3724 | X8(I(DstReg | Stack, em_pop)), |
73fba5f4 | 3725 | /* 0x60 - 0x67 */ |
b96a7fad TY |
3726 | I(ImplicitOps | Stack | No64, em_pusha), |
3727 | I(ImplicitOps | Stack | No64, em_popa), | |
73fba5f4 AK |
3728 | N, D(DstReg | SrcMem32 | ModRM | Mov) /* movsxd (x86/64) */ , |
3729 | N, N, N, N, | |
3730 | /* 0x68 - 0x6F */ | |
d46164db AK |
3731 | I(SrcImm | Mov | Stack, em_push), |
3732 | I(DstReg | SrcMem | ModRM | Src2Imm, em_imul_3op), | |
f3a1b9f4 AK |
3733 | I(SrcImmByte | Mov | Stack, em_push), |
3734 | I(DstReg | SrcMem | ModRM | Src2ImmByte, em_imul_3op), | |
2b5e97e1 TY |
3735 | I2bvIP(DstDI | SrcDX | Mov | String, em_in, ins, check_perm_in), /* insb, insw/insd */ |
3736 | I2bvIP(SrcSI | DstDX | String, em_out, outs, check_perm_out), /* outsb, outsw/outsd */ | |
73fba5f4 AK |
3737 | /* 0x70 - 0x7F */ |
3738 | X16(D(SrcImmByte)), | |
3739 | /* 0x80 - 0x87 */ | |
1c2545be TY |
3740 | G(ByteOp | DstMem | SrcImm, group1), |
3741 | G(DstMem | SrcImm, group1), | |
3742 | G(ByteOp | DstMem | SrcImm | No64, group1), | |
3743 | G(DstMem | SrcImmByte, group1), | |
9f21ca59 | 3744 | I2bv(DstMem | SrcReg | ModRM, em_test), |
d5ae7ce8 | 3745 | I2bv(DstMem | SrcReg | ModRM | Lock | PageTable, em_xchg), |
73fba5f4 | 3746 | /* 0x88 - 0x8F */ |
d5ae7ce8 | 3747 | I2bv(DstMem | SrcReg | ModRM | Mov | PageTable, em_mov), |
b9eac5f4 | 3748 | I2bv(DstReg | SrcMem | ModRM | Mov, em_mov), |
d5ae7ce8 | 3749 | I(DstMem | SrcNone | ModRM | Mov | PageTable, em_mov_rm_sreg), |
1bd5f469 TY |
3750 | D(ModRM | SrcMem | NoAccess | DstReg), |
3751 | I(ImplicitOps | SrcMem16 | ModRM, em_mov_sreg_rm), | |
3752 | G(0, group1A), | |
73fba5f4 | 3753 | /* 0x90 - 0x97 */ |
bf608f88 | 3754 | DI(SrcAcc | DstReg, pause), X7(D(SrcAcc | DstReg)), |
73fba5f4 | 3755 | /* 0x98 - 0x9F */ |
61429142 | 3756 | D(DstAcc | SrcNone), I(ImplicitOps | SrcAcc, em_cwd), |
cc4feed5 | 3757 | I(SrcImmFAddr | No64, em_call_far), N, |
62aaa2f0 | 3758 | II(ImplicitOps | Stack, em_pushf, pushf), |
2dd7caa0 | 3759 | II(ImplicitOps | Stack, em_popf, popf), N, I(ImplicitOps, em_lahf), |
73fba5f4 | 3760 | /* 0xA0 - 0xA7 */ |
b9eac5f4 | 3761 | I2bv(DstAcc | SrcMem | Mov | MemAbs, em_mov), |
d5ae7ce8 | 3762 | I2bv(DstMem | SrcAcc | Mov | MemAbs | PageTable, em_mov), |
b9eac5f4 | 3763 | I2bv(SrcSI | DstDI | Mov | String, em_mov), |
d67fc27a | 3764 | I2bv(SrcSI | DstDI | String, em_cmp), |
73fba5f4 | 3765 | /* 0xA8 - 0xAF */ |
9f21ca59 | 3766 | I2bv(DstAcc | SrcImm, em_test), |
b9eac5f4 AK |
3767 | I2bv(SrcAcc | DstDI | Mov | String, em_mov), |
3768 | I2bv(SrcSI | DstAcc | Mov | String, em_mov), | |
d67fc27a | 3769 | I2bv(SrcAcc | DstDI | String, em_cmp), |
73fba5f4 | 3770 | /* 0xB0 - 0xB7 */ |
b9eac5f4 | 3771 | X8(I(ByteOp | DstReg | SrcImm | Mov, em_mov)), |
73fba5f4 | 3772 | /* 0xB8 - 0xBF */ |
b9eac5f4 | 3773 | X8(I(DstReg | SrcImm | Mov, em_mov)), |
73fba5f4 | 3774 | /* 0xC0 - 0xC7 */ |
d2c6c7ad | 3775 | D2bv(DstMem | SrcImmByte | ModRM), |
40ece7c7 | 3776 | I(ImplicitOps | Stack | SrcImmU16, em_ret_near_imm), |
ebda02c2 | 3777 | I(ImplicitOps | Stack, em_ret), |
d4b4325f AK |
3778 | I(DstReg | SrcMemFAddr | ModRM | No64 | Src2ES, em_lseg), |
3779 | I(DstReg | SrcMemFAddr | ModRM | No64 | Src2DS, em_lseg), | |
a4d4a7c1 | 3780 | G(ByteOp, group11), G(0, group11), |
73fba5f4 | 3781 | /* 0xC8 - 0xCF */ |
612e89f0 AK |
3782 | I(Stack | SrcImmU16 | Src2ImmByte, em_enter), I(Stack, em_leave), |
3783 | N, I(ImplicitOps | Stack, em_ret_far), | |
3c6e276f | 3784 | D(ImplicitOps), DI(SrcImmByte, intn), |
db5b0762 | 3785 | D(ImplicitOps | No64), II(ImplicitOps, em_iret, iret), |
73fba5f4 | 3786 | /* 0xD0 - 0xD7 */ |
d2c6c7ad | 3787 | D2bv(DstMem | SrcOne | ModRM), D2bv(DstMem | ModRM), |
73fba5f4 AK |
3788 | N, N, N, N, |
3789 | /* 0xD8 - 0xDF */ | |
3790 | N, N, N, N, N, N, N, N, | |
3791 | /* 0xE0 - 0xE7 */ | |
d06e03ad TY |
3792 | X3(I(SrcImmByte, em_loop)), |
3793 | I(SrcImmByte, em_jcxz), | |
d7841a4b TY |
3794 | I2bvIP(SrcImmUByte | DstAcc, em_in, in, check_perm_in), |
3795 | I2bvIP(SrcAcc | DstImmUByte, em_out, out, check_perm_out), | |
73fba5f4 | 3796 | /* 0xE8 - 0xEF */ |
d4ddafcd | 3797 | I(SrcImm | Stack, em_call), D(SrcImm | ImplicitOps), |
db5b0762 | 3798 | I(SrcImmFAddr | No64, em_jmp_far), D(SrcImmByte | ImplicitOps), |
d7841a4b TY |
3799 | I2bvIP(SrcDX | DstAcc, em_in, in, check_perm_in), |
3800 | I2bvIP(SrcAcc | DstDX, em_out, out, check_perm_out), | |
73fba5f4 | 3801 | /* 0xF0 - 0xF7 */ |
bf608f88 | 3802 | N, DI(ImplicitOps, icebp), N, N, |
3c6e276f AK |
3803 | DI(ImplicitOps | Priv, hlt), D(ImplicitOps), |
3804 | G(ByteOp, group3), G(0, group3), | |
73fba5f4 | 3805 | /* 0xF8 - 0xFF */ |
f411e6cd TY |
3806 | D(ImplicitOps), D(ImplicitOps), |
3807 | I(ImplicitOps, em_cli), I(ImplicitOps, em_sti), | |
73fba5f4 AK |
3808 | D(ImplicitOps), D(ImplicitOps), G(0, group4), G(0, group5), |
3809 | }; | |
3810 | ||
3811 | static struct opcode twobyte_table[256] = { | |
3812 | /* 0x00 - 0x0F */ | |
dee6bb70 | 3813 | G(0, group6), GD(0, &group7), N, N, |
db5b0762 TY |
3814 | N, I(ImplicitOps | VendorSpecific, em_syscall), |
3815 | II(ImplicitOps | Priv, em_clts, clts), N, | |
3c6e276f | 3816 | DI(ImplicitOps | Priv, invd), DI(ImplicitOps | Priv, wbinvd), N, N, |
73fba5f4 AK |
3817 | N, D(ImplicitOps | ModRM), N, N, |
3818 | /* 0x10 - 0x1F */ | |
3819 | N, N, N, N, N, N, N, N, D(ImplicitOps | ModRM), N, N, N, N, N, N, N, | |
3820 | /* 0x20 - 0x2F */ | |
cfec82cb | 3821 | DIP(ModRM | DstMem | Priv | Op3264, cr_read, check_cr_read), |
3b88e41a | 3822 | DIP(ModRM | DstMem | Priv | Op3264, dr_read, check_dr_read), |
bc00f8d2 TY |
3823 | IIP(ModRM | SrcMem | Priv | Op3264, em_cr_write, cr_write, check_cr_write), |
3824 | IIP(ModRM | SrcMem | Priv | Op3264, em_dr_write, dr_write, check_dr_write), | |
73fba5f4 | 3825 | N, N, N, N, |
3e114eb4 AK |
3826 | N, N, N, GP(ModRM | DstMem | SrcReg | Sse | Mov | Aligned, &pfx_vmovntpx), |
3827 | N, N, N, N, | |
73fba5f4 | 3828 | /* 0x30 - 0x3F */ |
e1e210b0 | 3829 | II(ImplicitOps | Priv, em_wrmsr, wrmsr), |
8061252e | 3830 | IIP(ImplicitOps, em_rdtsc, rdtsc, check_rdtsc), |
e1e210b0 | 3831 | II(ImplicitOps | Priv, em_rdmsr, rdmsr), |
222d21aa | 3832 | IIP(ImplicitOps, em_rdpmc, rdpmc, check_rdpmc), |
db5b0762 TY |
3833 | I(ImplicitOps | VendorSpecific, em_sysenter), |
3834 | I(ImplicitOps | Priv | VendorSpecific, em_sysexit), | |
d867162c | 3835 | N, N, |
73fba5f4 AK |
3836 | N, N, N, N, N, N, N, N, |
3837 | /* 0x40 - 0x4F */ | |
3838 | X16(D(DstReg | SrcMem | ModRM | Mov)), | |
3839 | /* 0x50 - 0x5F */ | |
3840 | N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, | |
3841 | /* 0x60 - 0x6F */ | |
aa97bb48 AK |
3842 | N, N, N, N, |
3843 | N, N, N, N, | |
3844 | N, N, N, N, | |
3845 | N, N, N, GP(SrcMem | DstReg | ModRM | Mov, &pfx_0f_6f_0f_7f), | |
73fba5f4 | 3846 | /* 0x70 - 0x7F */ |
aa97bb48 AK |
3847 | N, N, N, N, |
3848 | N, N, N, N, | |
3849 | N, N, N, N, | |
3850 | N, N, N, GP(SrcReg | DstMem | ModRM | Mov, &pfx_0f_6f_0f_7f), | |
73fba5f4 AK |
3851 | /* 0x80 - 0x8F */ |
3852 | X16(D(SrcImm)), | |
3853 | /* 0x90 - 0x9F */ | |
ee45b58e | 3854 | X16(D(ByteOp | DstMem | SrcNone | ModRM| Mov)), |
73fba5f4 | 3855 | /* 0xA0 - 0xA7 */ |
1cd196ea | 3856 | I(Stack | Src2FS, em_push_sreg), I(Stack | Src2FS, em_pop_sreg), |
6d6eede4 | 3857 | II(ImplicitOps, em_cpuid, cpuid), I(DstMem | SrcReg | ModRM | BitOp, em_bt), |
73fba5f4 AK |
3858 | D(DstMem | SrcReg | Src2ImmByte | ModRM), |
3859 | D(DstMem | SrcReg | Src2CL | ModRM), N, N, | |
3860 | /* 0xA8 - 0xAF */ | |
1cd196ea | 3861 | I(Stack | Src2GS, em_push_sreg), I(Stack | Src2GS, em_pop_sreg), |
d5ae7ce8 | 3862 | DI(ImplicitOps, rsm), |
ce7faab2 | 3863 | I(DstMem | SrcReg | ModRM | BitOp | Lock | PageTable, em_bts), |
73fba5f4 AK |
3864 | D(DstMem | SrcReg | Src2ImmByte | ModRM), |
3865 | D(DstMem | SrcReg | Src2CL | ModRM), | |
5c82aa29 | 3866 | D(ModRM), I(DstReg | SrcMem | ModRM, em_imul), |
73fba5f4 | 3867 | /* 0xB0 - 0xB7 */ |
e940b5c2 | 3868 | I2bv(DstMem | SrcReg | ModRM | Lock | PageTable, em_cmpxchg), |
d4b4325f | 3869 | I(DstReg | SrcMemFAddr | ModRM | Src2SS, em_lseg), |
ce7faab2 | 3870 | I(DstMem | SrcReg | ModRM | BitOp | Lock, em_btr), |
d4b4325f AK |
3871 | I(DstReg | SrcMemFAddr | ModRM | Src2FS, em_lseg), |
3872 | I(DstReg | SrcMemFAddr | ModRM | Src2GS, em_lseg), | |
2adb5ad9 | 3873 | D(DstReg | SrcMem8 | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov), |
73fba5f4 AK |
3874 | /* 0xB8 - 0xBF */ |
3875 | N, N, | |
ce7faab2 TY |
3876 | G(BitOp, group8), |
3877 | I(DstMem | SrcReg | ModRM | BitOp | Lock | PageTable, em_btc), | |
ff227392 | 3878 | I(DstReg | SrcMem | ModRM, em_bsf), I(DstReg | SrcMem | ModRM, em_bsr), |
2adb5ad9 | 3879 | D(DstReg | SrcMem8 | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov), |
9299836e | 3880 | /* 0xC0 - 0xC7 */ |
739ae406 | 3881 | D2bv(DstMem | SrcReg | ModRM | Lock), |
92f738a5 | 3882 | N, D(DstMem | SrcReg | ModRM | Mov), |
73fba5f4 | 3883 | N, N, N, GD(0, &group9), |
9299836e AK |
3884 | /* 0xC8 - 0xCF */ |
3885 | X8(I(DstReg, em_bswap)), | |
73fba5f4 AK |
3886 | /* 0xD0 - 0xDF */ |
3887 | N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, | |
3888 | /* 0xE0 - 0xEF */ | |
3889 | N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, | |
3890 | /* 0xF0 - 0xFF */ | |
3891 | N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N | |
3892 | }; | |
3893 | ||
3894 | #undef D | |
3895 | #undef N | |
3896 | #undef G | |
3897 | #undef GD | |
3898 | #undef I | |
aa97bb48 | 3899 | #undef GP |
01de8b09 | 3900 | #undef EXT |
73fba5f4 | 3901 | |
8d8f4e9f | 3902 | #undef D2bv |
f6511935 | 3903 | #undef D2bvIP |
8d8f4e9f | 3904 | #undef I2bv |
d7841a4b | 3905 | #undef I2bvIP |
d67fc27a | 3906 | #undef I6ALU |
8d8f4e9f | 3907 | |
9dac77fa | 3908 | static unsigned imm_size(struct x86_emulate_ctxt *ctxt) |
39f21ee5 AK |
3909 | { |
3910 | unsigned size; | |
3911 | ||
9dac77fa | 3912 | size = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; |
39f21ee5 AK |
3913 | if (size == 8) |
3914 | size = 4; | |
3915 | return size; | |
3916 | } | |
3917 | ||
3918 | static int decode_imm(struct x86_emulate_ctxt *ctxt, struct operand *op, | |
3919 | unsigned size, bool sign_extension) | |
3920 | { | |
39f21ee5 AK |
3921 | int rc = X86EMUL_CONTINUE; |
3922 | ||
3923 | op->type = OP_IMM; | |
3924 | op->bytes = size; | |
9dac77fa | 3925 | op->addr.mem.ea = ctxt->_eip; |
39f21ee5 AK |
3926 | /* NB. Immediates are sign-extended as necessary. */ |
3927 | switch (op->bytes) { | |
3928 | case 1: | |
e85a1085 | 3929 | op->val = insn_fetch(s8, ctxt); |
39f21ee5 AK |
3930 | break; |
3931 | case 2: | |
e85a1085 | 3932 | op->val = insn_fetch(s16, ctxt); |
39f21ee5 AK |
3933 | break; |
3934 | case 4: | |
e85a1085 | 3935 | op->val = insn_fetch(s32, ctxt); |
39f21ee5 AK |
3936 | break; |
3937 | } | |
3938 | if (!sign_extension) { | |
3939 | switch (op->bytes) { | |
3940 | case 1: | |
3941 | op->val &= 0xff; | |
3942 | break; | |
3943 | case 2: | |
3944 | op->val &= 0xffff; | |
3945 | break; | |
3946 | case 4: | |
3947 | op->val &= 0xffffffff; | |
3948 | break; | |
3949 | } | |
3950 | } | |
3951 | done: | |
3952 | return rc; | |
3953 | } | |
3954 | ||
a9945549 AK |
3955 | static int decode_operand(struct x86_emulate_ctxt *ctxt, struct operand *op, |
3956 | unsigned d) | |
3957 | { | |
3958 | int rc = X86EMUL_CONTINUE; | |
3959 | ||
3960 | switch (d) { | |
3961 | case OpReg: | |
2adb5ad9 | 3962 | decode_register_operand(ctxt, op); |
a9945549 AK |
3963 | break; |
3964 | case OpImmUByte: | |
608aabe3 | 3965 | rc = decode_imm(ctxt, op, 1, false); |
a9945549 AK |
3966 | break; |
3967 | case OpMem: | |
41ddf978 | 3968 | ctxt->memop.bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; |
0fe59128 AK |
3969 | mem_common: |
3970 | *op = ctxt->memop; | |
3971 | ctxt->memopp = op; | |
3972 | if ((ctxt->d & BitOp) && op == &ctxt->dst) | |
a9945549 AK |
3973 | fetch_bit_operand(ctxt); |
3974 | op->orig_val = op->val; | |
3975 | break; | |
41ddf978 AK |
3976 | case OpMem64: |
3977 | ctxt->memop.bytes = 8; | |
3978 | goto mem_common; | |
a9945549 AK |
3979 | case OpAcc: |
3980 | op->type = OP_REG; | |
3981 | op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; | |
dd856efa | 3982 | op->addr.reg = reg_rmw(ctxt, VCPU_REGS_RAX); |
a9945549 AK |
3983 | fetch_register_operand(op); |
3984 | op->orig_val = op->val; | |
3985 | break; | |
3986 | case OpDI: | |
3987 | op->type = OP_MEM; | |
3988 | op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; | |
3989 | op->addr.mem.ea = | |
dd856efa | 3990 | register_address(ctxt, reg_read(ctxt, VCPU_REGS_RDI)); |
a9945549 AK |
3991 | op->addr.mem.seg = VCPU_SREG_ES; |
3992 | op->val = 0; | |
3993 | break; | |
3994 | case OpDX: | |
3995 | op->type = OP_REG; | |
3996 | op->bytes = 2; | |
dd856efa | 3997 | op->addr.reg = reg_rmw(ctxt, VCPU_REGS_RDX); |
a9945549 AK |
3998 | fetch_register_operand(op); |
3999 | break; | |
4dd6a57d AK |
4000 | case OpCL: |
4001 | op->bytes = 1; | |
dd856efa | 4002 | op->val = reg_read(ctxt, VCPU_REGS_RCX) & 0xff; |
4dd6a57d AK |
4003 | break; |
4004 | case OpImmByte: | |
4005 | rc = decode_imm(ctxt, op, 1, true); | |
4006 | break; | |
4007 | case OpOne: | |
4008 | op->bytes = 1; | |
4009 | op->val = 1; | |
4010 | break; | |
4011 | case OpImm: | |
4012 | rc = decode_imm(ctxt, op, imm_size(ctxt), true); | |
4013 | break; | |
28867cee AK |
4014 | case OpMem8: |
4015 | ctxt->memop.bytes = 1; | |
4016 | goto mem_common; | |
0fe59128 AK |
4017 | case OpMem16: |
4018 | ctxt->memop.bytes = 2; | |
4019 | goto mem_common; | |
4020 | case OpMem32: | |
4021 | ctxt->memop.bytes = 4; | |
4022 | goto mem_common; | |
4023 | case OpImmU16: | |
4024 | rc = decode_imm(ctxt, op, 2, false); | |
4025 | break; | |
4026 | case OpImmU: | |
4027 | rc = decode_imm(ctxt, op, imm_size(ctxt), false); | |
4028 | break; | |
4029 | case OpSI: | |
4030 | op->type = OP_MEM; | |
4031 | op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; | |
4032 | op->addr.mem.ea = | |
dd856efa | 4033 | register_address(ctxt, reg_read(ctxt, VCPU_REGS_RSI)); |
0fe59128 AK |
4034 | op->addr.mem.seg = seg_override(ctxt); |
4035 | op->val = 0; | |
4036 | break; | |
4037 | case OpImmFAddr: | |
4038 | op->type = OP_IMM; | |
4039 | op->addr.mem.ea = ctxt->_eip; | |
4040 | op->bytes = ctxt->op_bytes + 2; | |
4041 | insn_fetch_arr(op->valptr, op->bytes, ctxt); | |
4042 | break; | |
4043 | case OpMemFAddr: | |
4044 | ctxt->memop.bytes = ctxt->op_bytes + 2; | |
4045 | goto mem_common; | |
c191a7a0 AK |
4046 | case OpES: |
4047 | op->val = VCPU_SREG_ES; | |
4048 | break; | |
4049 | case OpCS: | |
4050 | op->val = VCPU_SREG_CS; | |
4051 | break; | |
4052 | case OpSS: | |
4053 | op->val = VCPU_SREG_SS; | |
4054 | break; | |
4055 | case OpDS: | |
4056 | op->val = VCPU_SREG_DS; | |
4057 | break; | |
4058 | case OpFS: | |
4059 | op->val = VCPU_SREG_FS; | |
4060 | break; | |
4061 | case OpGS: | |
4062 | op->val = VCPU_SREG_GS; | |
4063 | break; | |
a9945549 AK |
4064 | case OpImplicit: |
4065 | /* Special instructions do their own operand decoding. */ | |
4066 | default: | |
4067 | op->type = OP_NONE; /* Disable writeback. */ | |
4068 | break; | |
4069 | } | |
4070 | ||
4071 | done: | |
4072 | return rc; | |
4073 | } | |
4074 | ||
ef5d75cc | 4075 | int x86_decode_insn(struct x86_emulate_ctxt *ctxt, void *insn, int insn_len) |
dde7e6d1 | 4076 | { |
dde7e6d1 AK |
4077 | int rc = X86EMUL_CONTINUE; |
4078 | int mode = ctxt->mode; | |
46561646 | 4079 | int def_op_bytes, def_ad_bytes, goffset, simd_prefix; |
0d7cdee8 | 4080 | bool op_prefix = false; |
46561646 | 4081 | struct opcode opcode; |
dde7e6d1 | 4082 | |
f09ed83e AK |
4083 | ctxt->memop.type = OP_NONE; |
4084 | ctxt->memopp = NULL; | |
9dac77fa AK |
4085 | ctxt->_eip = ctxt->eip; |
4086 | ctxt->fetch.start = ctxt->_eip; | |
4087 | ctxt->fetch.end = ctxt->fetch.start + insn_len; | |
dc25e89e | 4088 | if (insn_len > 0) |
9dac77fa | 4089 | memcpy(ctxt->fetch.data, insn, insn_len); |
dde7e6d1 AK |
4090 | |
4091 | switch (mode) { | |
4092 | case X86EMUL_MODE_REAL: | |
4093 | case X86EMUL_MODE_VM86: | |
4094 | case X86EMUL_MODE_PROT16: | |
4095 | def_op_bytes = def_ad_bytes = 2; | |
4096 | break; | |
4097 | case X86EMUL_MODE_PROT32: | |
4098 | def_op_bytes = def_ad_bytes = 4; | |
4099 | break; | |
4100 | #ifdef CONFIG_X86_64 | |
4101 | case X86EMUL_MODE_PROT64: | |
4102 | def_op_bytes = 4; | |
4103 | def_ad_bytes = 8; | |
4104 | break; | |
4105 | #endif | |
4106 | default: | |
1d2887e2 | 4107 | return EMULATION_FAILED; |
dde7e6d1 AK |
4108 | } |
4109 | ||
9dac77fa AK |
4110 | ctxt->op_bytes = def_op_bytes; |
4111 | ctxt->ad_bytes = def_ad_bytes; | |
dde7e6d1 AK |
4112 | |
4113 | /* Legacy prefixes. */ | |
4114 | for (;;) { | |
e85a1085 | 4115 | switch (ctxt->b = insn_fetch(u8, ctxt)) { |
dde7e6d1 | 4116 | case 0x66: /* operand-size override */ |
0d7cdee8 | 4117 | op_prefix = true; |
dde7e6d1 | 4118 | /* switch between 2/4 bytes */ |
9dac77fa | 4119 | ctxt->op_bytes = def_op_bytes ^ 6; |
dde7e6d1 AK |
4120 | break; |
4121 | case 0x67: /* address-size override */ | |
4122 | if (mode == X86EMUL_MODE_PROT64) | |
4123 | /* switch between 4/8 bytes */ | |
9dac77fa | 4124 | ctxt->ad_bytes = def_ad_bytes ^ 12; |
dde7e6d1 AK |
4125 | else |
4126 | /* switch between 2/4 bytes */ | |
9dac77fa | 4127 | ctxt->ad_bytes = def_ad_bytes ^ 6; |
dde7e6d1 AK |
4128 | break; |
4129 | case 0x26: /* ES override */ | |
4130 | case 0x2e: /* CS override */ | |
4131 | case 0x36: /* SS override */ | |
4132 | case 0x3e: /* DS override */ | |
9dac77fa | 4133 | set_seg_override(ctxt, (ctxt->b >> 3) & 3); |
dde7e6d1 AK |
4134 | break; |
4135 | case 0x64: /* FS override */ | |
4136 | case 0x65: /* GS override */ | |
9dac77fa | 4137 | set_seg_override(ctxt, ctxt->b & 7); |
dde7e6d1 AK |
4138 | break; |
4139 | case 0x40 ... 0x4f: /* REX */ | |
4140 | if (mode != X86EMUL_MODE_PROT64) | |
4141 | goto done_prefixes; | |
9dac77fa | 4142 | ctxt->rex_prefix = ctxt->b; |
dde7e6d1 AK |
4143 | continue; |
4144 | case 0xf0: /* LOCK */ | |
9dac77fa | 4145 | ctxt->lock_prefix = 1; |
dde7e6d1 AK |
4146 | break; |
4147 | case 0xf2: /* REPNE/REPNZ */ | |
dde7e6d1 | 4148 | case 0xf3: /* REP/REPE/REPZ */ |
9dac77fa | 4149 | ctxt->rep_prefix = ctxt->b; |
dde7e6d1 AK |
4150 | break; |
4151 | default: | |
4152 | goto done_prefixes; | |
4153 | } | |
4154 | ||
4155 | /* Any legacy prefix after a REX prefix nullifies its effect. */ | |
4156 | ||
9dac77fa | 4157 | ctxt->rex_prefix = 0; |
dde7e6d1 AK |
4158 | } |
4159 | ||
4160 | done_prefixes: | |
4161 | ||
4162 | /* REX prefix. */ | |
9dac77fa AK |
4163 | if (ctxt->rex_prefix & 8) |
4164 | ctxt->op_bytes = 8; /* REX.W */ | |
dde7e6d1 AK |
4165 | |
4166 | /* Opcode byte(s). */ | |
9dac77fa | 4167 | opcode = opcode_table[ctxt->b]; |
d3ad6243 | 4168 | /* Two-byte opcode? */ |
9dac77fa AK |
4169 | if (ctxt->b == 0x0f) { |
4170 | ctxt->twobyte = 1; | |
e85a1085 | 4171 | ctxt->b = insn_fetch(u8, ctxt); |
9dac77fa | 4172 | opcode = twobyte_table[ctxt->b]; |
dde7e6d1 | 4173 | } |
9dac77fa | 4174 | ctxt->d = opcode.flags; |
dde7e6d1 | 4175 | |
9f4260e7 TY |
4176 | if (ctxt->d & ModRM) |
4177 | ctxt->modrm = insn_fetch(u8, ctxt); | |
4178 | ||
9dac77fa AK |
4179 | while (ctxt->d & GroupMask) { |
4180 | switch (ctxt->d & GroupMask) { | |
46561646 | 4181 | case Group: |
9dac77fa | 4182 | goffset = (ctxt->modrm >> 3) & 7; |
46561646 AK |
4183 | opcode = opcode.u.group[goffset]; |
4184 | break; | |
4185 | case GroupDual: | |
9dac77fa AK |
4186 | goffset = (ctxt->modrm >> 3) & 7; |
4187 | if ((ctxt->modrm >> 6) == 3) | |
46561646 AK |
4188 | opcode = opcode.u.gdual->mod3[goffset]; |
4189 | else | |
4190 | opcode = opcode.u.gdual->mod012[goffset]; | |
4191 | break; | |
4192 | case RMExt: | |
9dac77fa | 4193 | goffset = ctxt->modrm & 7; |
01de8b09 | 4194 | opcode = opcode.u.group[goffset]; |
46561646 AK |
4195 | break; |
4196 | case Prefix: | |
9dac77fa | 4197 | if (ctxt->rep_prefix && op_prefix) |
1d2887e2 | 4198 | return EMULATION_FAILED; |
9dac77fa | 4199 | simd_prefix = op_prefix ? 0x66 : ctxt->rep_prefix; |
46561646 AK |
4200 | switch (simd_prefix) { |
4201 | case 0x00: opcode = opcode.u.gprefix->pfx_no; break; | |
4202 | case 0x66: opcode = opcode.u.gprefix->pfx_66; break; | |
4203 | case 0xf2: opcode = opcode.u.gprefix->pfx_f2; break; | |
4204 | case 0xf3: opcode = opcode.u.gprefix->pfx_f3; break; | |
4205 | } | |
4206 | break; | |
4207 | default: | |
1d2887e2 | 4208 | return EMULATION_FAILED; |
0d7cdee8 | 4209 | } |
46561646 | 4210 | |
b1ea50b2 | 4211 | ctxt->d &= ~(u64)GroupMask; |
9dac77fa | 4212 | ctxt->d |= opcode.flags; |
0d7cdee8 AK |
4213 | } |
4214 | ||
9dac77fa AK |
4215 | ctxt->execute = opcode.u.execute; |
4216 | ctxt->check_perm = opcode.check_perm; | |
4217 | ctxt->intercept = opcode.intercept; | |
dde7e6d1 AK |
4218 | |
4219 | /* Unrecognised? */ | |
9dac77fa | 4220 | if (ctxt->d == 0 || (ctxt->d & Undefined)) |
1d2887e2 | 4221 | return EMULATION_FAILED; |
dde7e6d1 | 4222 | |
9dac77fa | 4223 | if (!(ctxt->d & VendorSpecific) && ctxt->only_vendor_specific_insn) |
1d2887e2 | 4224 | return EMULATION_FAILED; |
d867162c | 4225 | |
9dac77fa AK |
4226 | if (mode == X86EMUL_MODE_PROT64 && (ctxt->d & Stack)) |
4227 | ctxt->op_bytes = 8; | |
dde7e6d1 | 4228 | |
9dac77fa | 4229 | if (ctxt->d & Op3264) { |
7f9b4b75 | 4230 | if (mode == X86EMUL_MODE_PROT64) |
9dac77fa | 4231 | ctxt->op_bytes = 8; |
7f9b4b75 | 4232 | else |
9dac77fa | 4233 | ctxt->op_bytes = 4; |
7f9b4b75 AK |
4234 | } |
4235 | ||
9dac77fa AK |
4236 | if (ctxt->d & Sse) |
4237 | ctxt->op_bytes = 16; | |
cbe2c9d3 AK |
4238 | else if (ctxt->d & Mmx) |
4239 | ctxt->op_bytes = 8; | |
1253791d | 4240 | |
dde7e6d1 | 4241 | /* ModRM and SIB bytes. */ |
9dac77fa | 4242 | if (ctxt->d & ModRM) { |
f09ed83e | 4243 | rc = decode_modrm(ctxt, &ctxt->memop); |
9dac77fa AK |
4244 | if (!ctxt->has_seg_override) |
4245 | set_seg_override(ctxt, ctxt->modrm_seg); | |
4246 | } else if (ctxt->d & MemAbs) | |
f09ed83e | 4247 | rc = decode_abs(ctxt, &ctxt->memop); |
dde7e6d1 AK |
4248 | if (rc != X86EMUL_CONTINUE) |
4249 | goto done; | |
4250 | ||
9dac77fa AK |
4251 | if (!ctxt->has_seg_override) |
4252 | set_seg_override(ctxt, VCPU_SREG_DS); | |
dde7e6d1 | 4253 | |
f09ed83e | 4254 | ctxt->memop.addr.mem.seg = seg_override(ctxt); |
dde7e6d1 | 4255 | |
f09ed83e AK |
4256 | if (ctxt->memop.type == OP_MEM && ctxt->ad_bytes != 8) |
4257 | ctxt->memop.addr.mem.ea = (u32)ctxt->memop.addr.mem.ea; | |
dde7e6d1 | 4258 | |
dde7e6d1 AK |
4259 | /* |
4260 | * Decode and fetch the source operand: register, memory | |
4261 | * or immediate. | |
4262 | */ | |
0fe59128 | 4263 | rc = decode_operand(ctxt, &ctxt->src, (ctxt->d >> SrcShift) & OpMask); |
39f21ee5 AK |
4264 | if (rc != X86EMUL_CONTINUE) |
4265 | goto done; | |
4266 | ||
dde7e6d1 AK |
4267 | /* |
4268 | * Decode and fetch the second source operand: register, memory | |
4269 | * or immediate. | |
4270 | */ | |
4dd6a57d | 4271 | rc = decode_operand(ctxt, &ctxt->src2, (ctxt->d >> Src2Shift) & OpMask); |
39f21ee5 AK |
4272 | if (rc != X86EMUL_CONTINUE) |
4273 | goto done; | |
4274 | ||
dde7e6d1 | 4275 | /* Decode and fetch the destination operand: register or memory. */ |
a9945549 | 4276 | rc = decode_operand(ctxt, &ctxt->dst, (ctxt->d >> DstShift) & OpMask); |
dde7e6d1 AK |
4277 | |
4278 | done: | |
f09ed83e AK |
4279 | if (ctxt->memopp && ctxt->memopp->type == OP_MEM && ctxt->rip_relative) |
4280 | ctxt->memopp->addr.mem.ea += ctxt->_eip; | |
cb16c348 | 4281 | |
1d2887e2 | 4282 | return (rc != X86EMUL_CONTINUE) ? EMULATION_FAILED : EMULATION_OK; |
dde7e6d1 AK |
4283 | } |
4284 | ||
1cb3f3ae XG |
4285 | bool x86_page_table_writing_insn(struct x86_emulate_ctxt *ctxt) |
4286 | { | |
4287 | return ctxt->d & PageTable; | |
4288 | } | |
4289 | ||
3e2f65d5 GN |
4290 | static bool string_insn_completed(struct x86_emulate_ctxt *ctxt) |
4291 | { | |
3e2f65d5 GN |
4292 | /* The second termination condition only applies for REPE |
4293 | * and REPNE. Test if the repeat string operation prefix is | |
4294 | * REPE/REPZ or REPNE/REPNZ and if it's the case it tests the | |
4295 | * corresponding termination condition according to: | |
4296 | * - if REPE/REPZ and ZF = 0 then done | |
4297 | * - if REPNE/REPNZ and ZF = 1 then done | |
4298 | */ | |
9dac77fa AK |
4299 | if (((ctxt->b == 0xa6) || (ctxt->b == 0xa7) || |
4300 | (ctxt->b == 0xae) || (ctxt->b == 0xaf)) | |
4301 | && (((ctxt->rep_prefix == REPE_PREFIX) && | |
3e2f65d5 | 4302 | ((ctxt->eflags & EFLG_ZF) == 0)) |
9dac77fa | 4303 | || ((ctxt->rep_prefix == REPNE_PREFIX) && |
3e2f65d5 GN |
4304 | ((ctxt->eflags & EFLG_ZF) == EFLG_ZF)))) |
4305 | return true; | |
4306 | ||
4307 | return false; | |
4308 | } | |
4309 | ||
cbe2c9d3 AK |
4310 | static int flush_pending_x87_faults(struct x86_emulate_ctxt *ctxt) |
4311 | { | |
4312 | bool fault = false; | |
4313 | ||
4314 | ctxt->ops->get_fpu(ctxt); | |
4315 | asm volatile("1: fwait \n\t" | |
4316 | "2: \n\t" | |
4317 | ".pushsection .fixup,\"ax\" \n\t" | |
4318 | "3: \n\t" | |
4319 | "movb $1, %[fault] \n\t" | |
4320 | "jmp 2b \n\t" | |
4321 | ".popsection \n\t" | |
4322 | _ASM_EXTABLE(1b, 3b) | |
38e8a2dd | 4323 | : [fault]"+qm"(fault)); |
cbe2c9d3 AK |
4324 | ctxt->ops->put_fpu(ctxt); |
4325 | ||
4326 | if (unlikely(fault)) | |
4327 | return emulate_exception(ctxt, MF_VECTOR, 0, false); | |
4328 | ||
4329 | return X86EMUL_CONTINUE; | |
4330 | } | |
4331 | ||
4332 | static void fetch_possible_mmx_operand(struct x86_emulate_ctxt *ctxt, | |
4333 | struct operand *op) | |
4334 | { | |
4335 | if (op->type == OP_MM) | |
4336 | read_mmx_reg(ctxt, &op->mm_val, op->addr.mm); | |
4337 | } | |
4338 | ||
dd856efa | 4339 | |
7b105ca2 | 4340 | int x86_emulate_insn(struct x86_emulate_ctxt *ctxt) |
8b4caf66 | 4341 | { |
9aabc88f | 4342 | struct x86_emulate_ops *ops = ctxt->ops; |
1b30eaa8 | 4343 | int rc = X86EMUL_CONTINUE; |
9dac77fa | 4344 | int saved_dst_type = ctxt->dst.type; |
8b4caf66 | 4345 | |
9dac77fa | 4346 | ctxt->mem_read.pos = 0; |
310b5d30 | 4347 | |
9dac77fa | 4348 | if (ctxt->mode == X86EMUL_MODE_PROT64 && (ctxt->d & No64)) { |
35d3d4a1 | 4349 | rc = emulate_ud(ctxt); |
1161624f GN |
4350 | goto done; |
4351 | } | |
4352 | ||
d380a5e4 | 4353 | /* LOCK prefix is allowed only with some instructions */ |
9dac77fa | 4354 | if (ctxt->lock_prefix && (!(ctxt->d & Lock) || ctxt->dst.type != OP_MEM)) { |
35d3d4a1 | 4355 | rc = emulate_ud(ctxt); |
d380a5e4 GN |
4356 | goto done; |
4357 | } | |
4358 | ||
9dac77fa | 4359 | if ((ctxt->d & SrcMask) == SrcMemFAddr && ctxt->src.type != OP_MEM) { |
35d3d4a1 | 4360 | rc = emulate_ud(ctxt); |
081bca0e AK |
4361 | goto done; |
4362 | } | |
4363 | ||
cbe2c9d3 AK |
4364 | if (((ctxt->d & (Sse|Mmx)) && ((ops->get_cr(ctxt, 0) & X86_CR0_EM))) |
4365 | || ((ctxt->d & Sse) && !(ops->get_cr(ctxt, 4) & X86_CR4_OSFXSR))) { | |
1253791d AK |
4366 | rc = emulate_ud(ctxt); |
4367 | goto done; | |
4368 | } | |
4369 | ||
cbe2c9d3 | 4370 | if ((ctxt->d & (Sse|Mmx)) && (ops->get_cr(ctxt, 0) & X86_CR0_TS)) { |
1253791d AK |
4371 | rc = emulate_nm(ctxt); |
4372 | goto done; | |
4373 | } | |
4374 | ||
cbe2c9d3 AK |
4375 | if (ctxt->d & Mmx) { |
4376 | rc = flush_pending_x87_faults(ctxt); | |
4377 | if (rc != X86EMUL_CONTINUE) | |
4378 | goto done; | |
4379 | /* | |
4380 | * Now that we know the fpu is exception safe, we can fetch | |
4381 | * operands from it. | |
4382 | */ | |
4383 | fetch_possible_mmx_operand(ctxt, &ctxt->src); | |
4384 | fetch_possible_mmx_operand(ctxt, &ctxt->src2); | |
4385 | if (!(ctxt->d & Mov)) | |
4386 | fetch_possible_mmx_operand(ctxt, &ctxt->dst); | |
4387 | } | |
4388 | ||
9dac77fa AK |
4389 | if (unlikely(ctxt->guest_mode) && ctxt->intercept) { |
4390 | rc = emulator_check_intercept(ctxt, ctxt->intercept, | |
8a76d7f2 | 4391 | X86_ICPT_PRE_EXCEPT); |
c4f035c6 AK |
4392 | if (rc != X86EMUL_CONTINUE) |
4393 | goto done; | |
4394 | } | |
4395 | ||
e92805ac | 4396 | /* Privileged instruction can be executed only in CPL=0 */ |
9dac77fa | 4397 | if ((ctxt->d & Priv) && ops->cpl(ctxt)) { |
35d3d4a1 | 4398 | rc = emulate_gp(ctxt, 0); |
e92805ac GN |
4399 | goto done; |
4400 | } | |
4401 | ||
8ea7d6ae | 4402 | /* Instruction can only be executed in protected mode */ |
9dac77fa | 4403 | if ((ctxt->d & Prot) && !(ctxt->mode & X86EMUL_MODE_PROT)) { |
8ea7d6ae JR |
4404 | rc = emulate_ud(ctxt); |
4405 | goto done; | |
4406 | } | |
4407 | ||
d09beabd | 4408 | /* Do instruction specific permission checks */ |
9dac77fa AK |
4409 | if (ctxt->check_perm) { |
4410 | rc = ctxt->check_perm(ctxt); | |
d09beabd JR |
4411 | if (rc != X86EMUL_CONTINUE) |
4412 | goto done; | |
4413 | } | |
4414 | ||
9dac77fa AK |
4415 | if (unlikely(ctxt->guest_mode) && ctxt->intercept) { |
4416 | rc = emulator_check_intercept(ctxt, ctxt->intercept, | |
8a76d7f2 | 4417 | X86_ICPT_POST_EXCEPT); |
c4f035c6 AK |
4418 | if (rc != X86EMUL_CONTINUE) |
4419 | goto done; | |
4420 | } | |
4421 | ||
9dac77fa | 4422 | if (ctxt->rep_prefix && (ctxt->d & String)) { |
b9fa9d6b | 4423 | /* All REP prefixes have the same first termination condition */ |
dd856efa | 4424 | if (address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) == 0) { |
9dac77fa | 4425 | ctxt->eip = ctxt->_eip; |
b9fa9d6b AK |
4426 | goto done; |
4427 | } | |
b9fa9d6b AK |
4428 | } |
4429 | ||
9dac77fa AK |
4430 | if ((ctxt->src.type == OP_MEM) && !(ctxt->d & NoAccess)) { |
4431 | rc = segmented_read(ctxt, ctxt->src.addr.mem, | |
4432 | ctxt->src.valptr, ctxt->src.bytes); | |
b60d513c | 4433 | if (rc != X86EMUL_CONTINUE) |
8b4caf66 | 4434 | goto done; |
9dac77fa | 4435 | ctxt->src.orig_val64 = ctxt->src.val64; |
8b4caf66 LV |
4436 | } |
4437 | ||
9dac77fa AK |
4438 | if (ctxt->src2.type == OP_MEM) { |
4439 | rc = segmented_read(ctxt, ctxt->src2.addr.mem, | |
4440 | &ctxt->src2.val, ctxt->src2.bytes); | |
e35b7b9c GN |
4441 | if (rc != X86EMUL_CONTINUE) |
4442 | goto done; | |
4443 | } | |
4444 | ||
9dac77fa | 4445 | if ((ctxt->d & DstMask) == ImplicitOps) |
8b4caf66 LV |
4446 | goto special_insn; |
4447 | ||
4448 | ||
9dac77fa | 4449 | if ((ctxt->dst.type == OP_MEM) && !(ctxt->d & Mov)) { |
69f55cb1 | 4450 | /* optimisation - avoid slow emulated read if Mov */ |
9dac77fa AK |
4451 | rc = segmented_read(ctxt, ctxt->dst.addr.mem, |
4452 | &ctxt->dst.val, ctxt->dst.bytes); | |
69f55cb1 GN |
4453 | if (rc != X86EMUL_CONTINUE) |
4454 | goto done; | |
038e51de | 4455 | } |
9dac77fa | 4456 | ctxt->dst.orig_val = ctxt->dst.val; |
038e51de | 4457 | |
018a98db AK |
4458 | special_insn: |
4459 | ||
9dac77fa AK |
4460 | if (unlikely(ctxt->guest_mode) && ctxt->intercept) { |
4461 | rc = emulator_check_intercept(ctxt, ctxt->intercept, | |
8a76d7f2 | 4462 | X86_ICPT_POST_MEMACCESS); |
c4f035c6 AK |
4463 | if (rc != X86EMUL_CONTINUE) |
4464 | goto done; | |
4465 | } | |
4466 | ||
9dac77fa AK |
4467 | if (ctxt->execute) { |
4468 | rc = ctxt->execute(ctxt); | |
ef65c889 AK |
4469 | if (rc != X86EMUL_CONTINUE) |
4470 | goto done; | |
4471 | goto writeback; | |
4472 | } | |
4473 | ||
9dac77fa | 4474 | if (ctxt->twobyte) |
6aa8b732 AK |
4475 | goto twobyte_insn; |
4476 | ||
9dac77fa | 4477 | switch (ctxt->b) { |
33615aa9 | 4478 | case 0x40 ... 0x47: /* inc r16/r32 */ |
d1eef45d | 4479 | emulate_1op(ctxt, "inc"); |
33615aa9 AK |
4480 | break; |
4481 | case 0x48 ... 0x4f: /* dec r16/r32 */ | |
d1eef45d | 4482 | emulate_1op(ctxt, "dec"); |
33615aa9 | 4483 | break; |
6aa8b732 | 4484 | case 0x63: /* movsxd */ |
8b4caf66 | 4485 | if (ctxt->mode != X86EMUL_MODE_PROT64) |
6aa8b732 | 4486 | goto cannot_emulate; |
9dac77fa | 4487 | ctxt->dst.val = (s32) ctxt->src.val; |
6aa8b732 | 4488 | break; |
b2833e3c | 4489 | case 0x70 ... 0x7f: /* jcc (short) */ |
9dac77fa AK |
4490 | if (test_cc(ctxt->b, ctxt->eflags)) |
4491 | jmp_rel(ctxt, ctxt->src.val); | |
018a98db | 4492 | break; |
7e0b54b1 | 4493 | case 0x8d: /* lea r16/r32, m */ |
9dac77fa | 4494 | ctxt->dst.val = ctxt->src.addr.mem.ea; |
7e0b54b1 | 4495 | break; |
3d9e77df | 4496 | case 0x90 ... 0x97: /* nop / xchg reg, rax */ |
dd856efa | 4497 | if (ctxt->dst.addr.reg == reg_rmw(ctxt, VCPU_REGS_RAX)) |
34698d8c | 4498 | break; |
e4f973ae TY |
4499 | rc = em_xchg(ctxt); |
4500 | break; | |
e8b6fa70 | 4501 | case 0x98: /* cbw/cwde/cdqe */ |
9dac77fa AK |
4502 | switch (ctxt->op_bytes) { |
4503 | case 2: ctxt->dst.val = (s8)ctxt->dst.val; break; | |
4504 | case 4: ctxt->dst.val = (s16)ctxt->dst.val; break; | |
4505 | case 8: ctxt->dst.val = (s32)ctxt->dst.val; break; | |
e8b6fa70 WY |
4506 | } |
4507 | break; | |
018a98db | 4508 | case 0xc0 ... 0xc1: |
51187683 | 4509 | rc = em_grp2(ctxt); |
018a98db | 4510 | break; |
6e154e56 | 4511 | case 0xcc: /* int3 */ |
5c5df76b TY |
4512 | rc = emulate_int(ctxt, 3); |
4513 | break; | |
6e154e56 | 4514 | case 0xcd: /* int n */ |
9dac77fa | 4515 | rc = emulate_int(ctxt, ctxt->src.val); |
6e154e56 MG |
4516 | break; |
4517 | case 0xce: /* into */ | |
5c5df76b TY |
4518 | if (ctxt->eflags & EFLG_OF) |
4519 | rc = emulate_int(ctxt, 4); | |
6e154e56 | 4520 | break; |
018a98db | 4521 | case 0xd0 ... 0xd1: /* Grp2 */ |
51187683 | 4522 | rc = em_grp2(ctxt); |
018a98db AK |
4523 | break; |
4524 | case 0xd2 ... 0xd3: /* Grp2 */ | |
dd856efa | 4525 | ctxt->src.val = reg_read(ctxt, VCPU_REGS_RCX); |
51187683 | 4526 | rc = em_grp2(ctxt); |
018a98db | 4527 | break; |
1a52e051 | 4528 | case 0xe9: /* jmp rel */ |
db5b0762 | 4529 | case 0xeb: /* jmp rel short */ |
9dac77fa AK |
4530 | jmp_rel(ctxt, ctxt->src.val); |
4531 | ctxt->dst.type = OP_NONE; /* Disable writeback. */ | |
1a52e051 | 4532 | break; |
111de5d6 | 4533 | case 0xf4: /* hlt */ |
6c3287f7 | 4534 | ctxt->ops->halt(ctxt); |
19fdfa0d | 4535 | break; |
111de5d6 AK |
4536 | case 0xf5: /* cmc */ |
4537 | /* complement carry flag from eflags reg */ | |
4538 | ctxt->eflags ^= EFLG_CF; | |
111de5d6 AK |
4539 | break; |
4540 | case 0xf8: /* clc */ | |
4541 | ctxt->eflags &= ~EFLG_CF; | |
111de5d6 | 4542 | break; |
8744aa9a MG |
4543 | case 0xf9: /* stc */ |
4544 | ctxt->eflags |= EFLG_CF; | |
4545 | break; | |
fb4616f4 MG |
4546 | case 0xfc: /* cld */ |
4547 | ctxt->eflags &= ~EFLG_DF; | |
fb4616f4 MG |
4548 | break; |
4549 | case 0xfd: /* std */ | |
4550 | ctxt->eflags |= EFLG_DF; | |
fb4616f4 | 4551 | break; |
91269b8f AK |
4552 | default: |
4553 | goto cannot_emulate; | |
6aa8b732 | 4554 | } |
018a98db | 4555 | |
7d9ddaed AK |
4556 | if (rc != X86EMUL_CONTINUE) |
4557 | goto done; | |
4558 | ||
018a98db | 4559 | writeback: |
adddcecf | 4560 | rc = writeback(ctxt); |
1b30eaa8 | 4561 | if (rc != X86EMUL_CONTINUE) |
018a98db AK |
4562 | goto done; |
4563 | ||
5cd21917 GN |
4564 | /* |
4565 | * restore dst type in case the decoding will be reused | |
4566 | * (happens for string instruction ) | |
4567 | */ | |
9dac77fa | 4568 | ctxt->dst.type = saved_dst_type; |
5cd21917 | 4569 | |
9dac77fa AK |
4570 | if ((ctxt->d & SrcMask) == SrcSI) |
4571 | string_addr_inc(ctxt, seg_override(ctxt), | |
4572 | VCPU_REGS_RSI, &ctxt->src); | |
a682e354 | 4573 | |
9dac77fa | 4574 | if ((ctxt->d & DstMask) == DstDI) |
90de84f5 | 4575 | string_addr_inc(ctxt, VCPU_SREG_ES, VCPU_REGS_RDI, |
9dac77fa | 4576 | &ctxt->dst); |
d9271123 | 4577 | |
9dac77fa AK |
4578 | if (ctxt->rep_prefix && (ctxt->d & String)) { |
4579 | struct read_cache *r = &ctxt->io_read; | |
dd856efa | 4580 | register_address_increment(ctxt, reg_rmw(ctxt, VCPU_REGS_RCX), -1); |
3e2f65d5 | 4581 | |
d2ddd1c4 GN |
4582 | if (!string_insn_completed(ctxt)) { |
4583 | /* | |
4584 | * Re-enter guest when pio read ahead buffer is empty | |
4585 | * or, if it is not used, after each 1024 iteration. | |
4586 | */ | |
dd856efa | 4587 | if ((r->end != 0 || reg_read(ctxt, VCPU_REGS_RCX) & 0x3ff) && |
d2ddd1c4 GN |
4588 | (r->end == 0 || r->end != r->pos)) { |
4589 | /* | |
4590 | * Reset read cache. Usually happens before | |
4591 | * decode, but since instruction is restarted | |
4592 | * we have to do it here. | |
4593 | */ | |
9dac77fa | 4594 | ctxt->mem_read.end = 0; |
dd856efa | 4595 | writeback_registers(ctxt); |
d2ddd1c4 GN |
4596 | return EMULATION_RESTART; |
4597 | } | |
4598 | goto done; /* skip rip writeback */ | |
0fa6ccbd | 4599 | } |
5cd21917 | 4600 | } |
d2ddd1c4 | 4601 | |
9dac77fa | 4602 | ctxt->eip = ctxt->_eip; |
018a98db AK |
4603 | |
4604 | done: | |
da9cb575 AK |
4605 | if (rc == X86EMUL_PROPAGATE_FAULT) |
4606 | ctxt->have_exception = true; | |
775fde86 JR |
4607 | if (rc == X86EMUL_INTERCEPTED) |
4608 | return EMULATION_INTERCEPTED; | |
4609 | ||
dd856efa AK |
4610 | if (rc == X86EMUL_CONTINUE) |
4611 | writeback_registers(ctxt); | |
4612 | ||
d2ddd1c4 | 4613 | return (rc == X86EMUL_UNHANDLEABLE) ? EMULATION_FAILED : EMULATION_OK; |
6aa8b732 AK |
4614 | |
4615 | twobyte_insn: | |
9dac77fa | 4616 | switch (ctxt->b) { |
018a98db | 4617 | case 0x09: /* wbinvd */ |
cfb22375 | 4618 | (ctxt->ops->wbinvd)(ctxt); |
f5f48ee1 SY |
4619 | break; |
4620 | case 0x08: /* invd */ | |
018a98db AK |
4621 | case 0x0d: /* GrpP (prefetch) */ |
4622 | case 0x18: /* Grp16 (prefetch/nop) */ | |
018a98db AK |
4623 | break; |
4624 | case 0x20: /* mov cr, reg */ | |
9dac77fa | 4625 | ctxt->dst.val = ops->get_cr(ctxt, ctxt->modrm_reg); |
018a98db | 4626 | break; |
6aa8b732 | 4627 | case 0x21: /* mov from dr to reg */ |
9dac77fa | 4628 | ops->get_dr(ctxt, ctxt->modrm_reg, &ctxt->dst.val); |
6aa8b732 | 4629 | break; |
6aa8b732 | 4630 | case 0x40 ... 0x4f: /* cmov */ |
9dac77fa AK |
4631 | ctxt->dst.val = ctxt->dst.orig_val = ctxt->src.val; |
4632 | if (!test_cc(ctxt->b, ctxt->eflags)) | |
4633 | ctxt->dst.type = OP_NONE; /* no writeback */ | |
6aa8b732 | 4634 | break; |
b2833e3c | 4635 | case 0x80 ... 0x8f: /* jnz rel, etc*/ |
9dac77fa AK |
4636 | if (test_cc(ctxt->b, ctxt->eflags)) |
4637 | jmp_rel(ctxt, ctxt->src.val); | |
018a98db | 4638 | break; |
ee45b58e | 4639 | case 0x90 ... 0x9f: /* setcc r/m8 */ |
9dac77fa | 4640 | ctxt->dst.val = test_cc(ctxt->b, ctxt->eflags); |
ee45b58e | 4641 | break; |
9bf8ea42 GT |
4642 | case 0xa4: /* shld imm8, r, r/m */ |
4643 | case 0xa5: /* shld cl, r, r/m */ | |
761441b9 | 4644 | emulate_2op_cl(ctxt, "shld"); |
9bf8ea42 | 4645 | break; |
9bf8ea42 GT |
4646 | case 0xac: /* shrd imm8, r, r/m */ |
4647 | case 0xad: /* shrd cl, r, r/m */ | |
761441b9 | 4648 | emulate_2op_cl(ctxt, "shrd"); |
9bf8ea42 | 4649 | break; |
2a7c5b8b GC |
4650 | case 0xae: /* clflush */ |
4651 | break; | |
6aa8b732 | 4652 | case 0xb6 ... 0xb7: /* movzx */ |
9dac77fa | 4653 | ctxt->dst.bytes = ctxt->op_bytes; |
361cad2b | 4654 | ctxt->dst.val = (ctxt->src.bytes == 1) ? (u8) ctxt->src.val |
9dac77fa | 4655 | : (u16) ctxt->src.val; |
6aa8b732 | 4656 | break; |
6aa8b732 | 4657 | case 0xbe ... 0xbf: /* movsx */ |
9dac77fa | 4658 | ctxt->dst.bytes = ctxt->op_bytes; |
361cad2b | 4659 | ctxt->dst.val = (ctxt->src.bytes == 1) ? (s8) ctxt->src.val : |
9dac77fa | 4660 | (s16) ctxt->src.val; |
6aa8b732 | 4661 | break; |
92f738a5 | 4662 | case 0xc0 ... 0xc1: /* xadd */ |
a31b9cea | 4663 | emulate_2op_SrcV(ctxt, "add"); |
92f738a5 | 4664 | /* Write back the register source. */ |
9dac77fa AK |
4665 | ctxt->src.val = ctxt->dst.orig_val; |
4666 | write_register_operand(&ctxt->src); | |
92f738a5 | 4667 | break; |
a012e65a | 4668 | case 0xc3: /* movnti */ |
9dac77fa AK |
4669 | ctxt->dst.bytes = ctxt->op_bytes; |
4670 | ctxt->dst.val = (ctxt->op_bytes == 4) ? (u32) ctxt->src.val : | |
4671 | (u64) ctxt->src.val; | |
a012e65a | 4672 | break; |
91269b8f AK |
4673 | default: |
4674 | goto cannot_emulate; | |
6aa8b732 | 4675 | } |
7d9ddaed AK |
4676 | |
4677 | if (rc != X86EMUL_CONTINUE) | |
4678 | goto done; | |
4679 | ||
6aa8b732 AK |
4680 | goto writeback; |
4681 | ||
4682 | cannot_emulate: | |
a0c0ab2f | 4683 | return EMULATION_FAILED; |
6aa8b732 | 4684 | } |
dd856efa AK |
4685 | |
4686 | void emulator_invalidate_register_cache(struct x86_emulate_ctxt *ctxt) | |
4687 | { | |
4688 | invalidate_registers(ctxt); | |
4689 | } | |
4690 | ||
4691 | void emulator_writeback_register_cache(struct x86_emulate_ctxt *ctxt) | |
4692 | { | |
4693 | writeback_registers(ctxt); | |
4694 | } |