Commit | Line | Data |
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6aa8b732 | 1 | /****************************************************************************** |
56e82318 | 2 | * emulate.c |
6aa8b732 AK |
3 | * |
4 | * Generic x86 (32-bit and 64-bit) instruction decoder and emulator. | |
5 | * | |
6 | * Copyright (c) 2005 Keir Fraser | |
7 | * | |
8 | * Linux coding style, mod r/m decoder, segment base fixes, real-mode | |
dcc0766b | 9 | * privileged instructions: |
6aa8b732 AK |
10 | * |
11 | * Copyright (C) 2006 Qumranet | |
9611c187 | 12 | * Copyright 2010 Red Hat, Inc. and/or its affiliates. |
6aa8b732 AK |
13 | * |
14 | * Avi Kivity <avi@qumranet.com> | |
15 | * Yaniv Kamay <yaniv@qumranet.com> | |
16 | * | |
17 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
18 | * the COPYING file in the top-level directory. | |
19 | * | |
20 | * From: xen-unstable 10676:af9809f51f81a3c43f276f00c81a52ef558afda4 | |
21 | */ | |
22 | ||
edf88417 | 23 | #include <linux/kvm_host.h> |
5fdbf976 | 24 | #include "kvm_cache_regs.h" |
6aa8b732 | 25 | #include <linux/module.h> |
56e82318 | 26 | #include <asm/kvm_emulate.h> |
b7d491e7 | 27 | #include <linux/stringify.h> |
6aa8b732 | 28 | |
3eeb3288 | 29 | #include "x86.h" |
38ba30ba | 30 | #include "tss.h" |
e99f0507 | 31 | |
a9945549 AK |
32 | /* |
33 | * Operand types | |
34 | */ | |
b1ea50b2 AK |
35 | #define OpNone 0ull |
36 | #define OpImplicit 1ull /* No generic decode */ | |
37 | #define OpReg 2ull /* Register */ | |
38 | #define OpMem 3ull /* Memory */ | |
39 | #define OpAcc 4ull /* Accumulator: AL/AX/EAX/RAX */ | |
40 | #define OpDI 5ull /* ES:DI/EDI/RDI */ | |
41 | #define OpMem64 6ull /* Memory, 64-bit */ | |
42 | #define OpImmUByte 7ull /* Zero-extended 8-bit immediate */ | |
43 | #define OpDX 8ull /* DX register */ | |
4dd6a57d AK |
44 | #define OpCL 9ull /* CL register (for shifts) */ |
45 | #define OpImmByte 10ull /* 8-bit sign extended immediate */ | |
46 | #define OpOne 11ull /* Implied 1 */ | |
5e2c6883 | 47 | #define OpImm 12ull /* Sign extended up to 32-bit immediate */ |
0fe59128 AK |
48 | #define OpMem16 13ull /* Memory operand (16-bit). */ |
49 | #define OpMem32 14ull /* Memory operand (32-bit). */ | |
50 | #define OpImmU 15ull /* Immediate operand, zero extended */ | |
51 | #define OpSI 16ull /* SI/ESI/RSI */ | |
52 | #define OpImmFAddr 17ull /* Immediate far address */ | |
53 | #define OpMemFAddr 18ull /* Far address in memory */ | |
54 | #define OpImmU16 19ull /* Immediate operand, 16 bits, zero extended */ | |
c191a7a0 AK |
55 | #define OpES 20ull /* ES */ |
56 | #define OpCS 21ull /* CS */ | |
57 | #define OpSS 22ull /* SS */ | |
58 | #define OpDS 23ull /* DS */ | |
59 | #define OpFS 24ull /* FS */ | |
60 | #define OpGS 25ull /* GS */ | |
28867cee | 61 | #define OpMem8 26ull /* 8-bit zero extended memory operand */ |
5e2c6883 | 62 | #define OpImm64 27ull /* Sign extended 16/32/64-bit immediate */ |
7fa57952 | 63 | #define OpXLat 28ull /* memory at BX/EBX/RBX + zero-extended AL */ |
820207c8 AK |
64 | #define OpAccLo 29ull /* Low part of extended acc (AX/AX/EAX/RAX) */ |
65 | #define OpAccHi 30ull /* High part of extended acc (-/DX/EDX/RDX) */ | |
0fe59128 AK |
66 | |
67 | #define OpBits 5 /* Width of operand field */ | |
b1ea50b2 | 68 | #define OpMask ((1ull << OpBits) - 1) |
a9945549 | 69 | |
6aa8b732 AK |
70 | /* |
71 | * Opcode effective-address decode tables. | |
72 | * Note that we only emulate instructions that have at least one memory | |
73 | * operand (excluding implicit stack references). We assume that stack | |
74 | * references and instruction fetches will never occur in special memory | |
75 | * areas that require emulation. So, for example, 'mov <imm>,<reg>' need | |
76 | * not be handled. | |
77 | */ | |
78 | ||
79 | /* Operand sizes: 8-bit operands or specified/overridden size. */ | |
ab85b12b | 80 | #define ByteOp (1<<0) /* 8-bit operands. */ |
6aa8b732 | 81 | /* Destination operand type. */ |
a9945549 AK |
82 | #define DstShift 1 |
83 | #define ImplicitOps (OpImplicit << DstShift) | |
84 | #define DstReg (OpReg << DstShift) | |
85 | #define DstMem (OpMem << DstShift) | |
86 | #define DstAcc (OpAcc << DstShift) | |
87 | #define DstDI (OpDI << DstShift) | |
88 | #define DstMem64 (OpMem64 << DstShift) | |
89 | #define DstImmUByte (OpImmUByte << DstShift) | |
90 | #define DstDX (OpDX << DstShift) | |
820207c8 | 91 | #define DstAccLo (OpAccLo << DstShift) |
a9945549 | 92 | #define DstMask (OpMask << DstShift) |
6aa8b732 | 93 | /* Source operand type. */ |
0fe59128 AK |
94 | #define SrcShift 6 |
95 | #define SrcNone (OpNone << SrcShift) | |
96 | #define SrcReg (OpReg << SrcShift) | |
97 | #define SrcMem (OpMem << SrcShift) | |
98 | #define SrcMem16 (OpMem16 << SrcShift) | |
99 | #define SrcMem32 (OpMem32 << SrcShift) | |
100 | #define SrcImm (OpImm << SrcShift) | |
101 | #define SrcImmByte (OpImmByte << SrcShift) | |
102 | #define SrcOne (OpOne << SrcShift) | |
103 | #define SrcImmUByte (OpImmUByte << SrcShift) | |
104 | #define SrcImmU (OpImmU << SrcShift) | |
105 | #define SrcSI (OpSI << SrcShift) | |
7fa57952 | 106 | #define SrcXLat (OpXLat << SrcShift) |
0fe59128 AK |
107 | #define SrcImmFAddr (OpImmFAddr << SrcShift) |
108 | #define SrcMemFAddr (OpMemFAddr << SrcShift) | |
109 | #define SrcAcc (OpAcc << SrcShift) | |
110 | #define SrcImmU16 (OpImmU16 << SrcShift) | |
5e2c6883 | 111 | #define SrcImm64 (OpImm64 << SrcShift) |
0fe59128 | 112 | #define SrcDX (OpDX << SrcShift) |
28867cee | 113 | #define SrcMem8 (OpMem8 << SrcShift) |
820207c8 | 114 | #define SrcAccHi (OpAccHi << SrcShift) |
0fe59128 | 115 | #define SrcMask (OpMask << SrcShift) |
221192bd MT |
116 | #define BitOp (1<<11) |
117 | #define MemAbs (1<<12) /* Memory operand is absolute displacement */ | |
118 | #define String (1<<13) /* String instruction (rep capable) */ | |
119 | #define Stack (1<<14) /* Stack instruction (push/pop) */ | |
120 | #define GroupMask (7<<15) /* Opcode uses one of the group mechanisms */ | |
121 | #define Group (1<<15) /* Bits 3:5 of modrm byte extend opcode */ | |
122 | #define GroupDual (2<<15) /* Alternate decoding of mod == 3 */ | |
123 | #define Prefix (3<<15) /* Instruction varies with 66/f2/f3 prefix */ | |
124 | #define RMExt (4<<15) /* Opcode extension in ModRM r/m if mod == 3 */ | |
045a282c | 125 | #define Escape (5<<15) /* Escape to coprocessor instruction */ |
39f062ff | 126 | #define InstrDual (6<<15) /* Alternate instruction decoding of mod == 3 */ |
221192bd | 127 | #define Sse (1<<18) /* SSE Vector instruction */ |
20c29ff2 AK |
128 | /* Generic ModRM decode. */ |
129 | #define ModRM (1<<19) | |
130 | /* Destination is only written; never read. */ | |
131 | #define Mov (1<<20) | |
d8769fed | 132 | /* Misc flags */ |
8ea7d6ae | 133 | #define Prot (1<<21) /* instruction generates #UD if not in prot-mode */ |
b51e974f | 134 | #define EmulateOnUD (1<<22) /* Emulate if unsupported by the host */ |
5a506b12 | 135 | #define NoAccess (1<<23) /* Don't access memory (lea/invlpg/verr etc) */ |
7f9b4b75 | 136 | #define Op3264 (1<<24) /* Operand is 64b in long mode, 32b otherwise */ |
047a4818 | 137 | #define Undefined (1<<25) /* No Such Instruction */ |
d380a5e4 | 138 | #define Lock (1<<26) /* lock prefix is allowed for the instruction */ |
e92805ac | 139 | #define Priv (1<<27) /* instruction generates #GP if current CPL != 0 */ |
d8769fed | 140 | #define No64 (1<<28) |
d5ae7ce8 | 141 | #define PageTable (1 << 29) /* instruction used to write page table */ |
0b789eee | 142 | #define NotImpl (1 << 30) /* instruction is not implemented */ |
0dc8d10f | 143 | /* Source 2 operand type */ |
0b789eee | 144 | #define Src2Shift (31) |
4dd6a57d | 145 | #define Src2None (OpNone << Src2Shift) |
ab2c5ce6 | 146 | #define Src2Mem (OpMem << Src2Shift) |
4dd6a57d AK |
147 | #define Src2CL (OpCL << Src2Shift) |
148 | #define Src2ImmByte (OpImmByte << Src2Shift) | |
149 | #define Src2One (OpOne << Src2Shift) | |
150 | #define Src2Imm (OpImm << Src2Shift) | |
c191a7a0 AK |
151 | #define Src2ES (OpES << Src2Shift) |
152 | #define Src2CS (OpCS << Src2Shift) | |
153 | #define Src2SS (OpSS << Src2Shift) | |
154 | #define Src2DS (OpDS << Src2Shift) | |
155 | #define Src2FS (OpFS << Src2Shift) | |
156 | #define Src2GS (OpGS << Src2Shift) | |
4dd6a57d | 157 | #define Src2Mask (OpMask << Src2Shift) |
cbe2c9d3 | 158 | #define Mmx ((u64)1 << 40) /* MMX Vector instruction */ |
1c11b376 AK |
159 | #define Aligned ((u64)1 << 41) /* Explicitly aligned (e.g. MOVDQA) */ |
160 | #define Unaligned ((u64)1 << 42) /* Explicitly unaligned (e.g. MOVDQU) */ | |
161 | #define Avx ((u64)1 << 43) /* Advanced Vector Extensions */ | |
e28bbd44 | 162 | #define Fastop ((u64)1 << 44) /* Use opcode::u.fastop */ |
b6744dc3 | 163 | #define NoWrite ((u64)1 << 45) /* No writeback */ |
fb32b1ed | 164 | #define SrcWrite ((u64)1 << 46) /* Write back src operand */ |
9b88ae99 | 165 | #define NoMod ((u64)1 << 47) /* Mod field is ignored */ |
d40a6898 PB |
166 | #define Intercept ((u64)1 << 48) /* Has valid intercept field */ |
167 | #define CheckPerm ((u64)1 << 49) /* Has valid check_perm field */ | |
10e38fc7 | 168 | #define NoBigReal ((u64)1 << 50) /* No big real mode */ |
68efa764 | 169 | #define PrivUD ((u64)1 << 51) /* #UD instead of #GP on CPL > 0 */ |
58b7075d | 170 | #define NearBranch ((u64)1 << 52) /* Near branches */ |
ed9aad21 | 171 | #define No16 ((u64)1 << 53) /* No 16 bit operand */ |
6aa8b732 | 172 | |
820207c8 | 173 | #define DstXacc (DstAccLo | SrcAccHi | SrcWrite) |
6aa8b732 | 174 | |
d0e53325 AK |
175 | #define X2(x...) x, x |
176 | #define X3(x...) X2(x), x | |
177 | #define X4(x...) X2(x), X2(x) | |
178 | #define X5(x...) X4(x), x | |
179 | #define X6(x...) X4(x), X2(x) | |
180 | #define X7(x...) X4(x), X3(x) | |
181 | #define X8(x...) X4(x), X4(x) | |
182 | #define X16(x...) X8(x), X8(x) | |
83babbca | 183 | |
e28bbd44 AK |
184 | #define NR_FASTOP (ilog2(sizeof(ulong)) + 1) |
185 | #define FASTOP_SIZE 8 | |
186 | ||
187 | /* | |
188 | * fastop functions have a special calling convention: | |
189 | * | |
017da7b6 AK |
190 | * dst: rax (in/out) |
191 | * src: rdx (in/out) | |
e28bbd44 AK |
192 | * src2: rcx (in) |
193 | * flags: rflags (in/out) | |
b8c0b6ae | 194 | * ex: rsi (in:fastop pointer, out:zero if exception) |
e28bbd44 AK |
195 | * |
196 | * Moreover, they are all exactly FASTOP_SIZE bytes long, so functions for | |
197 | * different operand sizes can be reached by calculation, rather than a jump | |
198 | * table (which would be bigger than the code). | |
199 | * | |
200 | * fastop functions are declared as taking a never-defined fastop parameter, | |
201 | * so they can't be called from C directly. | |
202 | */ | |
203 | ||
204 | struct fastop; | |
205 | ||
d65b1dee | 206 | struct opcode { |
b1ea50b2 AK |
207 | u64 flags : 56; |
208 | u64 intercept : 8; | |
120df890 | 209 | union { |
ef65c889 | 210 | int (*execute)(struct x86_emulate_ctxt *ctxt); |
fd0a0d82 MK |
211 | const struct opcode *group; |
212 | const struct group_dual *gdual; | |
213 | const struct gprefix *gprefix; | |
045a282c | 214 | const struct escape *esc; |
39f062ff | 215 | const struct instr_dual *idual; |
e28bbd44 | 216 | void (*fastop)(struct fastop *fake); |
120df890 | 217 | } u; |
d09beabd | 218 | int (*check_perm)(struct x86_emulate_ctxt *ctxt); |
120df890 AK |
219 | }; |
220 | ||
221 | struct group_dual { | |
222 | struct opcode mod012[8]; | |
223 | struct opcode mod3[8]; | |
d65b1dee AK |
224 | }; |
225 | ||
0d7cdee8 AK |
226 | struct gprefix { |
227 | struct opcode pfx_no; | |
228 | struct opcode pfx_66; | |
229 | struct opcode pfx_f2; | |
230 | struct opcode pfx_f3; | |
231 | }; | |
232 | ||
045a282c GN |
233 | struct escape { |
234 | struct opcode op[8]; | |
235 | struct opcode high[64]; | |
236 | }; | |
237 | ||
39f062ff NA |
238 | struct instr_dual { |
239 | struct opcode mod012; | |
240 | struct opcode mod3; | |
241 | }; | |
242 | ||
6aa8b732 | 243 | /* EFLAGS bit definitions. */ |
d4c6a154 GN |
244 | #define EFLG_ID (1<<21) |
245 | #define EFLG_VIP (1<<20) | |
246 | #define EFLG_VIF (1<<19) | |
247 | #define EFLG_AC (1<<18) | |
b1d86143 AP |
248 | #define EFLG_VM (1<<17) |
249 | #define EFLG_RF (1<<16) | |
d4c6a154 GN |
250 | #define EFLG_IOPL (3<<12) |
251 | #define EFLG_NT (1<<14) | |
6aa8b732 AK |
252 | #define EFLG_OF (1<<11) |
253 | #define EFLG_DF (1<<10) | |
b1d86143 | 254 | #define EFLG_IF (1<<9) |
d4c6a154 | 255 | #define EFLG_TF (1<<8) |
6aa8b732 AK |
256 | #define EFLG_SF (1<<7) |
257 | #define EFLG_ZF (1<<6) | |
258 | #define EFLG_AF (1<<4) | |
259 | #define EFLG_PF (1<<2) | |
260 | #define EFLG_CF (1<<0) | |
261 | ||
62bd430e MG |
262 | #define EFLG_RESERVED_ZEROS_MASK 0xffc0802a |
263 | #define EFLG_RESERVED_ONE_MASK 2 | |
264 | ||
dd856efa AK |
265 | static ulong reg_read(struct x86_emulate_ctxt *ctxt, unsigned nr) |
266 | { | |
267 | if (!(ctxt->regs_valid & (1 << nr))) { | |
268 | ctxt->regs_valid |= 1 << nr; | |
269 | ctxt->_regs[nr] = ctxt->ops->read_gpr(ctxt, nr); | |
270 | } | |
271 | return ctxt->_regs[nr]; | |
272 | } | |
273 | ||
274 | static ulong *reg_write(struct x86_emulate_ctxt *ctxt, unsigned nr) | |
275 | { | |
276 | ctxt->regs_valid |= 1 << nr; | |
277 | ctxt->regs_dirty |= 1 << nr; | |
278 | return &ctxt->_regs[nr]; | |
279 | } | |
280 | ||
281 | static ulong *reg_rmw(struct x86_emulate_ctxt *ctxt, unsigned nr) | |
282 | { | |
283 | reg_read(ctxt, nr); | |
284 | return reg_write(ctxt, nr); | |
285 | } | |
286 | ||
287 | static void writeback_registers(struct x86_emulate_ctxt *ctxt) | |
288 | { | |
289 | unsigned reg; | |
290 | ||
291 | for_each_set_bit(reg, (ulong *)&ctxt->regs_dirty, 16) | |
292 | ctxt->ops->write_gpr(ctxt, reg, ctxt->_regs[reg]); | |
293 | } | |
294 | ||
295 | static void invalidate_registers(struct x86_emulate_ctxt *ctxt) | |
296 | { | |
297 | ctxt->regs_dirty = 0; | |
298 | ctxt->regs_valid = 0; | |
299 | } | |
300 | ||
6aa8b732 AK |
301 | /* |
302 | * These EFLAGS bits are restored from saved value during emulation, and | |
303 | * any changes are written back to the saved value after emulation. | |
304 | */ | |
305 | #define EFLAGS_MASK (EFLG_OF|EFLG_SF|EFLG_ZF|EFLG_AF|EFLG_PF|EFLG_CF) | |
306 | ||
dda96d8f AK |
307 | #ifdef CONFIG_X86_64 |
308 | #define ON64(x) x | |
309 | #else | |
310 | #define ON64(x) | |
311 | #endif | |
312 | ||
4d758349 AK |
313 | static int fastop(struct x86_emulate_ctxt *ctxt, void (*fop)(struct fastop *)); |
314 | ||
b7d491e7 AK |
315 | #define FOP_ALIGN ".align " __stringify(FASTOP_SIZE) " \n\t" |
316 | #define FOP_RET "ret \n\t" | |
317 | ||
318 | #define FOP_START(op) \ | |
319 | extern void em_##op(struct fastop *fake); \ | |
320 | asm(".pushsection .text, \"ax\" \n\t" \ | |
321 | ".global em_" #op " \n\t" \ | |
322 | FOP_ALIGN \ | |
323 | "em_" #op ": \n\t" | |
324 | ||
325 | #define FOP_END \ | |
326 | ".popsection") | |
327 | ||
0bdea068 AK |
328 | #define FOPNOP() FOP_ALIGN FOP_RET |
329 | ||
b7d491e7 | 330 | #define FOP1E(op, dst) \ |
b8c0b6ae AK |
331 | FOP_ALIGN "10: " #op " %" #dst " \n\t" FOP_RET |
332 | ||
333 | #define FOP1EEX(op, dst) \ | |
334 | FOP1E(op, dst) _ASM_EXTABLE(10b, kvm_fastop_exception) | |
b7d491e7 AK |
335 | |
336 | #define FASTOP1(op) \ | |
337 | FOP_START(op) \ | |
338 | FOP1E(op##b, al) \ | |
339 | FOP1E(op##w, ax) \ | |
340 | FOP1E(op##l, eax) \ | |
341 | ON64(FOP1E(op##q, rax)) \ | |
342 | FOP_END | |
343 | ||
b9fa409b AK |
344 | /* 1-operand, using src2 (for MUL/DIV r/m) */ |
345 | #define FASTOP1SRC2(op, name) \ | |
346 | FOP_START(name) \ | |
347 | FOP1E(op, cl) \ | |
348 | FOP1E(op, cx) \ | |
349 | FOP1E(op, ecx) \ | |
350 | ON64(FOP1E(op, rcx)) \ | |
351 | FOP_END | |
352 | ||
b8c0b6ae AK |
353 | /* 1-operand, using src2 (for MUL/DIV r/m), with exceptions */ |
354 | #define FASTOP1SRC2EX(op, name) \ | |
355 | FOP_START(name) \ | |
356 | FOP1EEX(op, cl) \ | |
357 | FOP1EEX(op, cx) \ | |
358 | FOP1EEX(op, ecx) \ | |
359 | ON64(FOP1EEX(op, rcx)) \ | |
360 | FOP_END | |
361 | ||
f7857f35 AK |
362 | #define FOP2E(op, dst, src) \ |
363 | FOP_ALIGN #op " %" #src ", %" #dst " \n\t" FOP_RET | |
364 | ||
365 | #define FASTOP2(op) \ | |
366 | FOP_START(op) \ | |
017da7b6 AK |
367 | FOP2E(op##b, al, dl) \ |
368 | FOP2E(op##w, ax, dx) \ | |
369 | FOP2E(op##l, eax, edx) \ | |
370 | ON64(FOP2E(op##q, rax, rdx)) \ | |
f7857f35 AK |
371 | FOP_END |
372 | ||
11c363ba AK |
373 | /* 2 operand, word only */ |
374 | #define FASTOP2W(op) \ | |
375 | FOP_START(op) \ | |
376 | FOPNOP() \ | |
017da7b6 AK |
377 | FOP2E(op##w, ax, dx) \ |
378 | FOP2E(op##l, eax, edx) \ | |
379 | ON64(FOP2E(op##q, rax, rdx)) \ | |
11c363ba AK |
380 | FOP_END |
381 | ||
007a3b54 AK |
382 | /* 2 operand, src is CL */ |
383 | #define FASTOP2CL(op) \ | |
384 | FOP_START(op) \ | |
385 | FOP2E(op##b, al, cl) \ | |
386 | FOP2E(op##w, ax, cl) \ | |
387 | FOP2E(op##l, eax, cl) \ | |
388 | ON64(FOP2E(op##q, rax, cl)) \ | |
389 | FOP_END | |
390 | ||
5aca3722 NA |
391 | /* 2 operand, src and dest are reversed */ |
392 | #define FASTOP2R(op, name) \ | |
393 | FOP_START(name) \ | |
394 | FOP2E(op##b, dl, al) \ | |
395 | FOP2E(op##w, dx, ax) \ | |
396 | FOP2E(op##l, edx, eax) \ | |
397 | ON64(FOP2E(op##q, rdx, rax)) \ | |
398 | FOP_END | |
399 | ||
0bdea068 AK |
400 | #define FOP3E(op, dst, src, src2) \ |
401 | FOP_ALIGN #op " %" #src2 ", %" #src ", %" #dst " \n\t" FOP_RET | |
402 | ||
403 | /* 3-operand, word-only, src2=cl */ | |
404 | #define FASTOP3WCL(op) \ | |
405 | FOP_START(op) \ | |
406 | FOPNOP() \ | |
017da7b6 AK |
407 | FOP3E(op##w, ax, dx, cl) \ |
408 | FOP3E(op##l, eax, edx, cl) \ | |
409 | ON64(FOP3E(op##q, rax, rdx, cl)) \ | |
0bdea068 AK |
410 | FOP_END |
411 | ||
9ae9feba AK |
412 | /* Special case for SETcc - 1 instruction per cc */ |
413 | #define FOP_SETCC(op) ".align 4; " #op " %al; ret \n\t" | |
414 | ||
b8c0b6ae AK |
415 | asm(".global kvm_fastop_exception \n" |
416 | "kvm_fastop_exception: xor %esi, %esi; ret"); | |
417 | ||
9ae9feba AK |
418 | FOP_START(setcc) |
419 | FOP_SETCC(seto) | |
420 | FOP_SETCC(setno) | |
421 | FOP_SETCC(setc) | |
422 | FOP_SETCC(setnc) | |
423 | FOP_SETCC(setz) | |
424 | FOP_SETCC(setnz) | |
425 | FOP_SETCC(setbe) | |
426 | FOP_SETCC(setnbe) | |
427 | FOP_SETCC(sets) | |
428 | FOP_SETCC(setns) | |
429 | FOP_SETCC(setp) | |
430 | FOP_SETCC(setnp) | |
431 | FOP_SETCC(setl) | |
432 | FOP_SETCC(setnl) | |
433 | FOP_SETCC(setle) | |
434 | FOP_SETCC(setnle) | |
435 | FOP_END; | |
436 | ||
326f578f PB |
437 | FOP_START(salc) "pushf; sbb %al, %al; popf \n\t" FOP_RET |
438 | FOP_END; | |
439 | ||
8a76d7f2 JR |
440 | static int emulator_check_intercept(struct x86_emulate_ctxt *ctxt, |
441 | enum x86_intercept intercept, | |
442 | enum x86_intercept_stage stage) | |
443 | { | |
444 | struct x86_instruction_info info = { | |
445 | .intercept = intercept, | |
9dac77fa AK |
446 | .rep_prefix = ctxt->rep_prefix, |
447 | .modrm_mod = ctxt->modrm_mod, | |
448 | .modrm_reg = ctxt->modrm_reg, | |
449 | .modrm_rm = ctxt->modrm_rm, | |
450 | .src_val = ctxt->src.val64, | |
6cbc5f5a | 451 | .dst_val = ctxt->dst.val64, |
9dac77fa AK |
452 | .src_bytes = ctxt->src.bytes, |
453 | .dst_bytes = ctxt->dst.bytes, | |
454 | .ad_bytes = ctxt->ad_bytes, | |
8a76d7f2 JR |
455 | .next_rip = ctxt->eip, |
456 | }; | |
457 | ||
2953538e | 458 | return ctxt->ops->intercept(ctxt, &info, stage); |
8a76d7f2 JR |
459 | } |
460 | ||
f47cfa31 AK |
461 | static void assign_masked(ulong *dest, ulong src, ulong mask) |
462 | { | |
463 | *dest = (*dest & ~mask) | (src & mask); | |
464 | } | |
465 | ||
9dac77fa | 466 | static inline unsigned long ad_mask(struct x86_emulate_ctxt *ctxt) |
ddcb2885 | 467 | { |
9dac77fa | 468 | return (1UL << (ctxt->ad_bytes << 3)) - 1; |
ddcb2885 HH |
469 | } |
470 | ||
f47cfa31 AK |
471 | static ulong stack_mask(struct x86_emulate_ctxt *ctxt) |
472 | { | |
473 | u16 sel; | |
474 | struct desc_struct ss; | |
475 | ||
476 | if (ctxt->mode == X86EMUL_MODE_PROT64) | |
477 | return ~0UL; | |
478 | ctxt->ops->get_segment(ctxt, &sel, &ss, NULL, VCPU_SREG_SS); | |
479 | return ~0U >> ((ss.d ^ 1) * 16); /* d=0: 0xffff; d=1: 0xffffffff */ | |
480 | } | |
481 | ||
612e89f0 AK |
482 | static int stack_size(struct x86_emulate_ctxt *ctxt) |
483 | { | |
484 | return (__fls(stack_mask(ctxt)) + 1) >> 3; | |
485 | } | |
486 | ||
6aa8b732 | 487 | /* Access/update address held in a register, based on addressing mode. */ |
e4706772 | 488 | static inline unsigned long |
9dac77fa | 489 | address_mask(struct x86_emulate_ctxt *ctxt, unsigned long reg) |
e4706772 | 490 | { |
9dac77fa | 491 | if (ctxt->ad_bytes == sizeof(unsigned long)) |
e4706772 HH |
492 | return reg; |
493 | else | |
9dac77fa | 494 | return reg & ad_mask(ctxt); |
e4706772 HH |
495 | } |
496 | ||
497 | static inline unsigned long | |
01485a22 | 498 | register_address(struct x86_emulate_ctxt *ctxt, int reg) |
e4706772 | 499 | { |
01485a22 | 500 | return address_mask(ctxt, reg_read(ctxt, reg)); |
e4706772 HH |
501 | } |
502 | ||
5ad105e5 AK |
503 | static void masked_increment(ulong *reg, ulong mask, int inc) |
504 | { | |
505 | assign_masked(reg, *reg + inc, mask); | |
506 | } | |
507 | ||
7a957275 | 508 | static inline void |
01485a22 | 509 | register_address_increment(struct x86_emulate_ctxt *ctxt, int reg, int inc) |
7a957275 | 510 | { |
5ad105e5 AK |
511 | ulong mask; |
512 | ||
9dac77fa | 513 | if (ctxt->ad_bytes == sizeof(unsigned long)) |
5ad105e5 | 514 | mask = ~0UL; |
7a957275 | 515 | else |
5ad105e5 | 516 | mask = ad_mask(ctxt); |
01485a22 | 517 | masked_increment(reg_rmw(ctxt, reg), mask, inc); |
5ad105e5 AK |
518 | } |
519 | ||
520 | static void rsp_increment(struct x86_emulate_ctxt *ctxt, int inc) | |
521 | { | |
dd856efa | 522 | masked_increment(reg_rmw(ctxt, VCPU_REGS_RSP), stack_mask(ctxt), inc); |
7a957275 | 523 | } |
6aa8b732 | 524 | |
56697687 AK |
525 | static u32 desc_limit_scaled(struct desc_struct *desc) |
526 | { | |
527 | u32 limit = get_desc_limit(desc); | |
528 | ||
529 | return desc->g ? (limit << 12) | 0xfff : limit; | |
530 | } | |
531 | ||
7b105ca2 | 532 | static unsigned long seg_base(struct x86_emulate_ctxt *ctxt, int seg) |
7a5b56df AK |
533 | { |
534 | if (ctxt->mode == X86EMUL_MODE_PROT64 && seg < VCPU_SREG_FS) | |
535 | return 0; | |
536 | ||
7b105ca2 | 537 | return ctxt->ops->get_cached_segment_base(ctxt, seg); |
7a5b56df AK |
538 | } |
539 | ||
35d3d4a1 AK |
540 | static int emulate_exception(struct x86_emulate_ctxt *ctxt, int vec, |
541 | u32 error, bool valid) | |
54b8486f | 542 | { |
e0ad0b47 | 543 | WARN_ON(vec > 0x1f); |
da9cb575 AK |
544 | ctxt->exception.vector = vec; |
545 | ctxt->exception.error_code = error; | |
546 | ctxt->exception.error_code_valid = valid; | |
35d3d4a1 | 547 | return X86EMUL_PROPAGATE_FAULT; |
54b8486f GN |
548 | } |
549 | ||
3b88e41a JR |
550 | static int emulate_db(struct x86_emulate_ctxt *ctxt) |
551 | { | |
552 | return emulate_exception(ctxt, DB_VECTOR, 0, false); | |
553 | } | |
554 | ||
35d3d4a1 | 555 | static int emulate_gp(struct x86_emulate_ctxt *ctxt, int err) |
54b8486f | 556 | { |
35d3d4a1 | 557 | return emulate_exception(ctxt, GP_VECTOR, err, true); |
54b8486f GN |
558 | } |
559 | ||
618ff15d AK |
560 | static int emulate_ss(struct x86_emulate_ctxt *ctxt, int err) |
561 | { | |
562 | return emulate_exception(ctxt, SS_VECTOR, err, true); | |
563 | } | |
564 | ||
35d3d4a1 | 565 | static int emulate_ud(struct x86_emulate_ctxt *ctxt) |
54b8486f | 566 | { |
35d3d4a1 | 567 | return emulate_exception(ctxt, UD_VECTOR, 0, false); |
54b8486f GN |
568 | } |
569 | ||
35d3d4a1 | 570 | static int emulate_ts(struct x86_emulate_ctxt *ctxt, int err) |
54b8486f | 571 | { |
35d3d4a1 | 572 | return emulate_exception(ctxt, TS_VECTOR, err, true); |
54b8486f GN |
573 | } |
574 | ||
34d1f490 AK |
575 | static int emulate_de(struct x86_emulate_ctxt *ctxt) |
576 | { | |
35d3d4a1 | 577 | return emulate_exception(ctxt, DE_VECTOR, 0, false); |
34d1f490 AK |
578 | } |
579 | ||
1253791d AK |
580 | static int emulate_nm(struct x86_emulate_ctxt *ctxt) |
581 | { | |
582 | return emulate_exception(ctxt, NM_VECTOR, 0, false); | |
583 | } | |
584 | ||
1aa36616 AK |
585 | static u16 get_segment_selector(struct x86_emulate_ctxt *ctxt, unsigned seg) |
586 | { | |
587 | u16 selector; | |
588 | struct desc_struct desc; | |
589 | ||
590 | ctxt->ops->get_segment(ctxt, &selector, &desc, NULL, seg); | |
591 | return selector; | |
592 | } | |
593 | ||
594 | static void set_segment_selector(struct x86_emulate_ctxt *ctxt, u16 selector, | |
595 | unsigned seg) | |
596 | { | |
597 | u16 dummy; | |
598 | u32 base3; | |
599 | struct desc_struct desc; | |
600 | ||
601 | ctxt->ops->get_segment(ctxt, &dummy, &desc, &base3, seg); | |
602 | ctxt->ops->set_segment(ctxt, selector, &desc, base3, seg); | |
603 | } | |
604 | ||
1c11b376 AK |
605 | /* |
606 | * x86 defines three classes of vector instructions: explicitly | |
607 | * aligned, explicitly unaligned, and the rest, which change behaviour | |
608 | * depending on whether they're AVX encoded or not. | |
609 | * | |
610 | * Also included is CMPXCHG16B which is not a vector instruction, yet it is | |
611 | * subject to the same check. | |
612 | */ | |
613 | static bool insn_aligned(struct x86_emulate_ctxt *ctxt, unsigned size) | |
614 | { | |
615 | if (likely(size < 16)) | |
616 | return false; | |
617 | ||
618 | if (ctxt->d & Aligned) | |
619 | return true; | |
620 | else if (ctxt->d & Unaligned) | |
621 | return false; | |
622 | else if (ctxt->d & Avx) | |
623 | return false; | |
624 | else | |
625 | return true; | |
626 | } | |
627 | ||
d09155d2 PB |
628 | static __always_inline int __linearize(struct x86_emulate_ctxt *ctxt, |
629 | struct segmented_address addr, | |
630 | unsigned *max_size, unsigned size, | |
631 | bool write, bool fetch, | |
d50eaa18 | 632 | enum x86emul_mode mode, ulong *linear) |
52fd8b44 | 633 | { |
618ff15d AK |
634 | struct desc_struct desc; |
635 | bool usable; | |
52fd8b44 | 636 | ulong la; |
618ff15d | 637 | u32 lim; |
1aa36616 | 638 | u16 sel; |
52fd8b44 | 639 | |
1c1c35ae | 640 | la = seg_base(ctxt, addr.seg) + addr.ea; |
fd56e154 | 641 | *max_size = 0; |
d50eaa18 | 642 | switch (mode) { |
618ff15d | 643 | case X86EMUL_MODE_PROT64: |
4be4de7e | 644 | if (is_noncanonical_address(la)) |
abc7d8a4 | 645 | goto bad; |
fd56e154 PB |
646 | |
647 | *max_size = min_t(u64, ~0u, (1ull << 48) - la); | |
648 | if (size > *max_size) | |
649 | goto bad; | |
618ff15d AK |
650 | break; |
651 | default: | |
1aa36616 AK |
652 | usable = ctxt->ops->get_segment(ctxt, &sel, &desc, NULL, |
653 | addr.seg); | |
618ff15d AK |
654 | if (!usable) |
655 | goto bad; | |
58b7825b GN |
656 | /* code segment in protected mode or read-only data segment */ |
657 | if ((((ctxt->mode != X86EMUL_MODE_REAL) && (desc.type & 8)) | |
658 | || !(desc.type & 2)) && write) | |
618ff15d AK |
659 | goto bad; |
660 | /* unreadable code segment */ | |
3d9b938e | 661 | if (!fetch && (desc.type & 8) && !(desc.type & 2)) |
618ff15d AK |
662 | goto bad; |
663 | lim = desc_limit_scaled(&desc); | |
997b0412 | 664 | if (!(desc.type & 8) && (desc.type & 4)) { |
fc058680 | 665 | /* expand-down segment */ |
fd56e154 | 666 | if (addr.ea <= lim) |
618ff15d AK |
667 | goto bad; |
668 | lim = desc.d ? 0xffffffff : 0xffff; | |
618ff15d | 669 | } |
997b0412 PB |
670 | if (addr.ea > lim) |
671 | goto bad; | |
672 | *max_size = min_t(u64, ~0u, (u64)lim + 1 - addr.ea); | |
fd56e154 PB |
673 | if (size > *max_size) |
674 | goto bad; | |
31ff6488 | 675 | la &= (u32)-1; |
618ff15d AK |
676 | break; |
677 | } | |
1c11b376 AK |
678 | if (insn_aligned(ctxt, size) && ((la & (size - 1)) != 0)) |
679 | return emulate_gp(ctxt, 0); | |
52fd8b44 AK |
680 | *linear = la; |
681 | return X86EMUL_CONTINUE; | |
618ff15d AK |
682 | bad: |
683 | if (addr.seg == VCPU_SREG_SS) | |
3606189f | 684 | return emulate_ss(ctxt, 0); |
618ff15d | 685 | else |
3606189f | 686 | return emulate_gp(ctxt, 0); |
52fd8b44 AK |
687 | } |
688 | ||
3d9b938e NE |
689 | static int linearize(struct x86_emulate_ctxt *ctxt, |
690 | struct segmented_address addr, | |
691 | unsigned size, bool write, | |
692 | ulong *linear) | |
693 | { | |
fd56e154 | 694 | unsigned max_size; |
d50eaa18 NA |
695 | return __linearize(ctxt, addr, &max_size, size, write, false, |
696 | ctxt->mode, linear); | |
3d9b938e NE |
697 | } |
698 | ||
d50eaa18 NA |
699 | static inline int assign_eip(struct x86_emulate_ctxt *ctxt, ulong dst, |
700 | enum x86emul_mode mode) | |
701 | { | |
702 | ulong linear; | |
703 | int rc; | |
704 | unsigned max_size; | |
705 | struct segmented_address addr = { .seg = VCPU_SREG_CS, | |
706 | .ea = dst }; | |
707 | ||
708 | if (ctxt->op_bytes != sizeof(unsigned long)) | |
709 | addr.ea = dst & ((1UL << (ctxt->op_bytes << 3)) - 1); | |
710 | rc = __linearize(ctxt, addr, &max_size, 1, false, true, mode, &linear); | |
711 | if (rc == X86EMUL_CONTINUE) | |
712 | ctxt->_eip = addr.ea; | |
713 | return rc; | |
714 | } | |
715 | ||
716 | static inline int assign_eip_near(struct x86_emulate_ctxt *ctxt, ulong dst) | |
717 | { | |
718 | return assign_eip(ctxt, dst, ctxt->mode); | |
719 | } | |
720 | ||
721 | static int assign_eip_far(struct x86_emulate_ctxt *ctxt, ulong dst, | |
722 | const struct desc_struct *cs_desc) | |
723 | { | |
724 | enum x86emul_mode mode = ctxt->mode; | |
725 | ||
726 | #ifdef CONFIG_X86_64 | |
727 | if (ctxt->mode >= X86EMUL_MODE_PROT32 && cs_desc->l) { | |
728 | u64 efer = 0; | |
729 | ||
730 | ctxt->ops->get_msr(ctxt, MSR_EFER, &efer); | |
731 | if (efer & EFER_LMA) | |
732 | mode = X86EMUL_MODE_PROT64; | |
733 | } | |
734 | #endif | |
735 | if (mode == X86EMUL_MODE_PROT16 || mode == X86EMUL_MODE_PROT32) | |
736 | mode = cs_desc->d ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16; | |
737 | return assign_eip(ctxt, dst, mode); | |
738 | } | |
739 | ||
740 | static inline int jmp_rel(struct x86_emulate_ctxt *ctxt, int rel) | |
741 | { | |
742 | return assign_eip_near(ctxt, ctxt->_eip + rel); | |
743 | } | |
3d9b938e | 744 | |
3ca3ac4d AK |
745 | static int segmented_read_std(struct x86_emulate_ctxt *ctxt, |
746 | struct segmented_address addr, | |
747 | void *data, | |
748 | unsigned size) | |
749 | { | |
9fa088f4 AK |
750 | int rc; |
751 | ulong linear; | |
752 | ||
83b8795a | 753 | rc = linearize(ctxt, addr, size, false, &linear); |
9fa088f4 AK |
754 | if (rc != X86EMUL_CONTINUE) |
755 | return rc; | |
0f65dd70 | 756 | return ctxt->ops->read_std(ctxt, linear, data, size, &ctxt->exception); |
3ca3ac4d AK |
757 | } |
758 | ||
807941b1 | 759 | /* |
285ca9e9 | 760 | * Prefetch the remaining bytes of the instruction without crossing page |
807941b1 TY |
761 | * boundary if they are not in fetch_cache yet. |
762 | */ | |
9506d57d | 763 | static int __do_insn_fetch_bytes(struct x86_emulate_ctxt *ctxt, int op_size) |
62266869 | 764 | { |
62266869 | 765 | int rc; |
fd56e154 | 766 | unsigned size, max_size; |
285ca9e9 | 767 | unsigned long linear; |
17052f16 | 768 | int cur_size = ctxt->fetch.end - ctxt->fetch.data; |
285ca9e9 | 769 | struct segmented_address addr = { .seg = VCPU_SREG_CS, |
17052f16 PB |
770 | .ea = ctxt->eip + cur_size }; |
771 | ||
fd56e154 PB |
772 | /* |
773 | * We do not know exactly how many bytes will be needed, and | |
774 | * __linearize is expensive, so fetch as much as possible. We | |
775 | * just have to avoid going beyond the 15 byte limit, the end | |
776 | * of the segment, or the end of the page. | |
777 | * | |
778 | * __linearize is called with size 0 so that it does not do any | |
779 | * boundary check itself. Instead, we use max_size to check | |
780 | * against op_size. | |
781 | */ | |
d50eaa18 NA |
782 | rc = __linearize(ctxt, addr, &max_size, 0, false, true, ctxt->mode, |
783 | &linear); | |
719d5a9b PB |
784 | if (unlikely(rc != X86EMUL_CONTINUE)) |
785 | return rc; | |
786 | ||
fd56e154 | 787 | size = min_t(unsigned, 15UL ^ cur_size, max_size); |
719d5a9b | 788 | size = min_t(unsigned, size, PAGE_SIZE - offset_in_page(linear)); |
5cfc7e0f PB |
789 | |
790 | /* | |
791 | * One instruction can only straddle two pages, | |
792 | * and one has been loaded at the beginning of | |
793 | * x86_decode_insn. So, if not enough bytes | |
794 | * still, we must have hit the 15-byte boundary. | |
795 | */ | |
796 | if (unlikely(size < op_size)) | |
fd56e154 PB |
797 | return emulate_gp(ctxt, 0); |
798 | ||
17052f16 | 799 | rc = ctxt->ops->fetch(ctxt, linear, ctxt->fetch.end, |
285ca9e9 PB |
800 | size, &ctxt->exception); |
801 | if (unlikely(rc != X86EMUL_CONTINUE)) | |
802 | return rc; | |
17052f16 | 803 | ctxt->fetch.end += size; |
3e2815e9 | 804 | return X86EMUL_CONTINUE; |
62266869 AK |
805 | } |
806 | ||
9506d57d PB |
807 | static __always_inline int do_insn_fetch_bytes(struct x86_emulate_ctxt *ctxt, |
808 | unsigned size) | |
62266869 | 809 | { |
08da44ae NA |
810 | unsigned done_size = ctxt->fetch.end - ctxt->fetch.ptr; |
811 | ||
812 | if (unlikely(done_size < size)) | |
813 | return __do_insn_fetch_bytes(ctxt, size - done_size); | |
9506d57d PB |
814 | else |
815 | return X86EMUL_CONTINUE; | |
62266869 AK |
816 | } |
817 | ||
67cbc90d | 818 | /* Fetch next part of the instruction being emulated. */ |
e85a1085 | 819 | #define insn_fetch(_type, _ctxt) \ |
9506d57d | 820 | ({ _type _x; \ |
9506d57d PB |
821 | \ |
822 | rc = do_insn_fetch_bytes(_ctxt, sizeof(_type)); \ | |
67cbc90d TY |
823 | if (rc != X86EMUL_CONTINUE) \ |
824 | goto done; \ | |
9506d57d | 825 | ctxt->_eip += sizeof(_type); \ |
17052f16 PB |
826 | _x = *(_type __aligned(1) *) ctxt->fetch.ptr; \ |
827 | ctxt->fetch.ptr += sizeof(_type); \ | |
9506d57d | 828 | _x; \ |
67cbc90d TY |
829 | }) |
830 | ||
807941b1 | 831 | #define insn_fetch_arr(_arr, _size, _ctxt) \ |
9506d57d | 832 | ({ \ |
9506d57d | 833 | rc = do_insn_fetch_bytes(_ctxt, _size); \ |
67cbc90d TY |
834 | if (rc != X86EMUL_CONTINUE) \ |
835 | goto done; \ | |
9506d57d | 836 | ctxt->_eip += (_size); \ |
17052f16 PB |
837 | memcpy(_arr, ctxt->fetch.ptr, _size); \ |
838 | ctxt->fetch.ptr += (_size); \ | |
67cbc90d TY |
839 | }) |
840 | ||
1e3c5cb0 RR |
841 | /* |
842 | * Given the 'reg' portion of a ModRM byte, and a register block, return a | |
843 | * pointer into the block that addresses the relevant register. | |
844 | * @highbyte_regs specifies whether to decode AH,CH,DH,BH. | |
845 | */ | |
dd856efa | 846 | static void *decode_register(struct x86_emulate_ctxt *ctxt, u8 modrm_reg, |
aa9ac1a6 | 847 | int byteop) |
6aa8b732 AK |
848 | { |
849 | void *p; | |
aa9ac1a6 | 850 | int highbyte_regs = (ctxt->rex_prefix == 0) && byteop; |
6aa8b732 | 851 | |
6aa8b732 | 852 | if (highbyte_regs && modrm_reg >= 4 && modrm_reg < 8) |
dd856efa AK |
853 | p = (unsigned char *)reg_rmw(ctxt, modrm_reg & 3) + 1; |
854 | else | |
855 | p = reg_rmw(ctxt, modrm_reg); | |
6aa8b732 AK |
856 | return p; |
857 | } | |
858 | ||
859 | static int read_descriptor(struct x86_emulate_ctxt *ctxt, | |
90de84f5 | 860 | struct segmented_address addr, |
6aa8b732 AK |
861 | u16 *size, unsigned long *address, int op_bytes) |
862 | { | |
863 | int rc; | |
864 | ||
865 | if (op_bytes == 2) | |
866 | op_bytes = 3; | |
867 | *address = 0; | |
3ca3ac4d | 868 | rc = segmented_read_std(ctxt, addr, size, 2); |
1b30eaa8 | 869 | if (rc != X86EMUL_CONTINUE) |
6aa8b732 | 870 | return rc; |
30b31ab6 | 871 | addr.ea += 2; |
3ca3ac4d | 872 | rc = segmented_read_std(ctxt, addr, address, op_bytes); |
6aa8b732 AK |
873 | return rc; |
874 | } | |
875 | ||
34b77652 AK |
876 | FASTOP2(add); |
877 | FASTOP2(or); | |
878 | FASTOP2(adc); | |
879 | FASTOP2(sbb); | |
880 | FASTOP2(and); | |
881 | FASTOP2(sub); | |
882 | FASTOP2(xor); | |
883 | FASTOP2(cmp); | |
884 | FASTOP2(test); | |
885 | ||
b9fa409b AK |
886 | FASTOP1SRC2(mul, mul_ex); |
887 | FASTOP1SRC2(imul, imul_ex); | |
b8c0b6ae AK |
888 | FASTOP1SRC2EX(div, div_ex); |
889 | FASTOP1SRC2EX(idiv, idiv_ex); | |
b9fa409b | 890 | |
34b77652 AK |
891 | FASTOP3WCL(shld); |
892 | FASTOP3WCL(shrd); | |
893 | ||
894 | FASTOP2W(imul); | |
895 | ||
896 | FASTOP1(not); | |
897 | FASTOP1(neg); | |
898 | FASTOP1(inc); | |
899 | FASTOP1(dec); | |
900 | ||
901 | FASTOP2CL(rol); | |
902 | FASTOP2CL(ror); | |
903 | FASTOP2CL(rcl); | |
904 | FASTOP2CL(rcr); | |
905 | FASTOP2CL(shl); | |
906 | FASTOP2CL(shr); | |
907 | FASTOP2CL(sar); | |
908 | ||
909 | FASTOP2W(bsf); | |
910 | FASTOP2W(bsr); | |
911 | FASTOP2W(bt); | |
912 | FASTOP2W(bts); | |
913 | FASTOP2W(btr); | |
914 | FASTOP2W(btc); | |
915 | ||
e47a5f5f AK |
916 | FASTOP2(xadd); |
917 | ||
5aca3722 NA |
918 | FASTOP2R(cmp, cmp_r); |
919 | ||
9ae9feba | 920 | static u8 test_cc(unsigned int condition, unsigned long flags) |
bbe9abbd | 921 | { |
9ae9feba AK |
922 | u8 rc; |
923 | void (*fop)(void) = (void *)em_setcc + 4 * (condition & 0xf); | |
bbe9abbd | 924 | |
9ae9feba | 925 | flags = (flags & EFLAGS_MASK) | X86_EFLAGS_IF; |
3f0c3d0b | 926 | asm("push %[flags]; popf; call *%[fastop]" |
9ae9feba AK |
927 | : "=a"(rc) : [fastop]"r"(fop), [flags]"r"(flags)); |
928 | return rc; | |
bbe9abbd NK |
929 | } |
930 | ||
91ff3cb4 AK |
931 | static void fetch_register_operand(struct operand *op) |
932 | { | |
933 | switch (op->bytes) { | |
934 | case 1: | |
935 | op->val = *(u8 *)op->addr.reg; | |
936 | break; | |
937 | case 2: | |
938 | op->val = *(u16 *)op->addr.reg; | |
939 | break; | |
940 | case 4: | |
941 | op->val = *(u32 *)op->addr.reg; | |
942 | break; | |
943 | case 8: | |
944 | op->val = *(u64 *)op->addr.reg; | |
945 | break; | |
946 | } | |
947 | } | |
948 | ||
1253791d AK |
949 | static void read_sse_reg(struct x86_emulate_ctxt *ctxt, sse128_t *data, int reg) |
950 | { | |
951 | ctxt->ops->get_fpu(ctxt); | |
952 | switch (reg) { | |
89a87c67 MK |
953 | case 0: asm("movdqa %%xmm0, %0" : "=m"(*data)); break; |
954 | case 1: asm("movdqa %%xmm1, %0" : "=m"(*data)); break; | |
955 | case 2: asm("movdqa %%xmm2, %0" : "=m"(*data)); break; | |
956 | case 3: asm("movdqa %%xmm3, %0" : "=m"(*data)); break; | |
957 | case 4: asm("movdqa %%xmm4, %0" : "=m"(*data)); break; | |
958 | case 5: asm("movdqa %%xmm5, %0" : "=m"(*data)); break; | |
959 | case 6: asm("movdqa %%xmm6, %0" : "=m"(*data)); break; | |
960 | case 7: asm("movdqa %%xmm7, %0" : "=m"(*data)); break; | |
1253791d | 961 | #ifdef CONFIG_X86_64 |
89a87c67 MK |
962 | case 8: asm("movdqa %%xmm8, %0" : "=m"(*data)); break; |
963 | case 9: asm("movdqa %%xmm9, %0" : "=m"(*data)); break; | |
964 | case 10: asm("movdqa %%xmm10, %0" : "=m"(*data)); break; | |
965 | case 11: asm("movdqa %%xmm11, %0" : "=m"(*data)); break; | |
966 | case 12: asm("movdqa %%xmm12, %0" : "=m"(*data)); break; | |
967 | case 13: asm("movdqa %%xmm13, %0" : "=m"(*data)); break; | |
968 | case 14: asm("movdqa %%xmm14, %0" : "=m"(*data)); break; | |
969 | case 15: asm("movdqa %%xmm15, %0" : "=m"(*data)); break; | |
1253791d AK |
970 | #endif |
971 | default: BUG(); | |
972 | } | |
973 | ctxt->ops->put_fpu(ctxt); | |
974 | } | |
975 | ||
976 | static void write_sse_reg(struct x86_emulate_ctxt *ctxt, sse128_t *data, | |
977 | int reg) | |
978 | { | |
979 | ctxt->ops->get_fpu(ctxt); | |
980 | switch (reg) { | |
89a87c67 MK |
981 | case 0: asm("movdqa %0, %%xmm0" : : "m"(*data)); break; |
982 | case 1: asm("movdqa %0, %%xmm1" : : "m"(*data)); break; | |
983 | case 2: asm("movdqa %0, %%xmm2" : : "m"(*data)); break; | |
984 | case 3: asm("movdqa %0, %%xmm3" : : "m"(*data)); break; | |
985 | case 4: asm("movdqa %0, %%xmm4" : : "m"(*data)); break; | |
986 | case 5: asm("movdqa %0, %%xmm5" : : "m"(*data)); break; | |
987 | case 6: asm("movdqa %0, %%xmm6" : : "m"(*data)); break; | |
988 | case 7: asm("movdqa %0, %%xmm7" : : "m"(*data)); break; | |
1253791d | 989 | #ifdef CONFIG_X86_64 |
89a87c67 MK |
990 | case 8: asm("movdqa %0, %%xmm8" : : "m"(*data)); break; |
991 | case 9: asm("movdqa %0, %%xmm9" : : "m"(*data)); break; | |
992 | case 10: asm("movdqa %0, %%xmm10" : : "m"(*data)); break; | |
993 | case 11: asm("movdqa %0, %%xmm11" : : "m"(*data)); break; | |
994 | case 12: asm("movdqa %0, %%xmm12" : : "m"(*data)); break; | |
995 | case 13: asm("movdqa %0, %%xmm13" : : "m"(*data)); break; | |
996 | case 14: asm("movdqa %0, %%xmm14" : : "m"(*data)); break; | |
997 | case 15: asm("movdqa %0, %%xmm15" : : "m"(*data)); break; | |
1253791d AK |
998 | #endif |
999 | default: BUG(); | |
1000 | } | |
1001 | ctxt->ops->put_fpu(ctxt); | |
1002 | } | |
1003 | ||
cbe2c9d3 AK |
1004 | static void read_mmx_reg(struct x86_emulate_ctxt *ctxt, u64 *data, int reg) |
1005 | { | |
1006 | ctxt->ops->get_fpu(ctxt); | |
1007 | switch (reg) { | |
1008 | case 0: asm("movq %%mm0, %0" : "=m"(*data)); break; | |
1009 | case 1: asm("movq %%mm1, %0" : "=m"(*data)); break; | |
1010 | case 2: asm("movq %%mm2, %0" : "=m"(*data)); break; | |
1011 | case 3: asm("movq %%mm3, %0" : "=m"(*data)); break; | |
1012 | case 4: asm("movq %%mm4, %0" : "=m"(*data)); break; | |
1013 | case 5: asm("movq %%mm5, %0" : "=m"(*data)); break; | |
1014 | case 6: asm("movq %%mm6, %0" : "=m"(*data)); break; | |
1015 | case 7: asm("movq %%mm7, %0" : "=m"(*data)); break; | |
1016 | default: BUG(); | |
1017 | } | |
1018 | ctxt->ops->put_fpu(ctxt); | |
1019 | } | |
1020 | ||
1021 | static void write_mmx_reg(struct x86_emulate_ctxt *ctxt, u64 *data, int reg) | |
1022 | { | |
1023 | ctxt->ops->get_fpu(ctxt); | |
1024 | switch (reg) { | |
1025 | case 0: asm("movq %0, %%mm0" : : "m"(*data)); break; | |
1026 | case 1: asm("movq %0, %%mm1" : : "m"(*data)); break; | |
1027 | case 2: asm("movq %0, %%mm2" : : "m"(*data)); break; | |
1028 | case 3: asm("movq %0, %%mm3" : : "m"(*data)); break; | |
1029 | case 4: asm("movq %0, %%mm4" : : "m"(*data)); break; | |
1030 | case 5: asm("movq %0, %%mm5" : : "m"(*data)); break; | |
1031 | case 6: asm("movq %0, %%mm6" : : "m"(*data)); break; | |
1032 | case 7: asm("movq %0, %%mm7" : : "m"(*data)); break; | |
1033 | default: BUG(); | |
1034 | } | |
1035 | ctxt->ops->put_fpu(ctxt); | |
1036 | } | |
1037 | ||
045a282c GN |
1038 | static int em_fninit(struct x86_emulate_ctxt *ctxt) |
1039 | { | |
1040 | if (ctxt->ops->get_cr(ctxt, 0) & (X86_CR0_TS | X86_CR0_EM)) | |
1041 | return emulate_nm(ctxt); | |
1042 | ||
1043 | ctxt->ops->get_fpu(ctxt); | |
1044 | asm volatile("fninit"); | |
1045 | ctxt->ops->put_fpu(ctxt); | |
1046 | return X86EMUL_CONTINUE; | |
1047 | } | |
1048 | ||
1049 | static int em_fnstcw(struct x86_emulate_ctxt *ctxt) | |
1050 | { | |
1051 | u16 fcw; | |
1052 | ||
1053 | if (ctxt->ops->get_cr(ctxt, 0) & (X86_CR0_TS | X86_CR0_EM)) | |
1054 | return emulate_nm(ctxt); | |
1055 | ||
1056 | ctxt->ops->get_fpu(ctxt); | |
1057 | asm volatile("fnstcw %0": "+m"(fcw)); | |
1058 | ctxt->ops->put_fpu(ctxt); | |
1059 | ||
1060 | /* force 2 byte destination */ | |
1061 | ctxt->dst.bytes = 2; | |
1062 | ctxt->dst.val = fcw; | |
1063 | ||
1064 | return X86EMUL_CONTINUE; | |
1065 | } | |
1066 | ||
1067 | static int em_fnstsw(struct x86_emulate_ctxt *ctxt) | |
1068 | { | |
1069 | u16 fsw; | |
1070 | ||
1071 | if (ctxt->ops->get_cr(ctxt, 0) & (X86_CR0_TS | X86_CR0_EM)) | |
1072 | return emulate_nm(ctxt); | |
1073 | ||
1074 | ctxt->ops->get_fpu(ctxt); | |
1075 | asm volatile("fnstsw %0": "+m"(fsw)); | |
1076 | ctxt->ops->put_fpu(ctxt); | |
1077 | ||
1078 | /* force 2 byte destination */ | |
1079 | ctxt->dst.bytes = 2; | |
1080 | ctxt->dst.val = fsw; | |
1081 | ||
1082 | return X86EMUL_CONTINUE; | |
1083 | } | |
1084 | ||
1253791d | 1085 | static void decode_register_operand(struct x86_emulate_ctxt *ctxt, |
2adb5ad9 | 1086 | struct operand *op) |
3c118e24 | 1087 | { |
9dac77fa | 1088 | unsigned reg = ctxt->modrm_reg; |
33615aa9 | 1089 | |
9dac77fa AK |
1090 | if (!(ctxt->d & ModRM)) |
1091 | reg = (ctxt->b & 7) | ((ctxt->rex_prefix & 1) << 3); | |
1253791d | 1092 | |
9dac77fa | 1093 | if (ctxt->d & Sse) { |
1253791d AK |
1094 | op->type = OP_XMM; |
1095 | op->bytes = 16; | |
1096 | op->addr.xmm = reg; | |
1097 | read_sse_reg(ctxt, &op->vec_val, reg); | |
1098 | return; | |
1099 | } | |
cbe2c9d3 AK |
1100 | if (ctxt->d & Mmx) { |
1101 | reg &= 7; | |
1102 | op->type = OP_MM; | |
1103 | op->bytes = 8; | |
1104 | op->addr.mm = reg; | |
1105 | return; | |
1106 | } | |
1253791d | 1107 | |
3c118e24 | 1108 | op->type = OP_REG; |
6d4d85ec GN |
1109 | op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; |
1110 | op->addr.reg = decode_register(ctxt, reg, ctxt->d & ByteOp); | |
1111 | ||
91ff3cb4 | 1112 | fetch_register_operand(op); |
3c118e24 AK |
1113 | op->orig_val = op->val; |
1114 | } | |
1115 | ||
a6e3407b AK |
1116 | static void adjust_modrm_seg(struct x86_emulate_ctxt *ctxt, int base_reg) |
1117 | { | |
1118 | if (base_reg == VCPU_REGS_RSP || base_reg == VCPU_REGS_RBP) | |
1119 | ctxt->modrm_seg = VCPU_SREG_SS; | |
1120 | } | |
1121 | ||
1c73ef66 | 1122 | static int decode_modrm(struct x86_emulate_ctxt *ctxt, |
2dbd0dd7 | 1123 | struct operand *op) |
1c73ef66 | 1124 | { |
1c73ef66 | 1125 | u8 sib; |
02357bdc | 1126 | int index_reg, base_reg, scale; |
3e2815e9 | 1127 | int rc = X86EMUL_CONTINUE; |
2dbd0dd7 | 1128 | ulong modrm_ea = 0; |
1c73ef66 | 1129 | |
02357bdc BD |
1130 | ctxt->modrm_reg = ((ctxt->rex_prefix << 1) & 8); /* REX.R */ |
1131 | index_reg = (ctxt->rex_prefix << 2) & 8; /* REX.X */ | |
1132 | base_reg = (ctxt->rex_prefix << 3) & 8; /* REX.B */ | |
1c73ef66 | 1133 | |
02357bdc | 1134 | ctxt->modrm_mod = (ctxt->modrm & 0xc0) >> 6; |
9dac77fa | 1135 | ctxt->modrm_reg |= (ctxt->modrm & 0x38) >> 3; |
02357bdc | 1136 | ctxt->modrm_rm = base_reg | (ctxt->modrm & 0x07); |
9dac77fa | 1137 | ctxt->modrm_seg = VCPU_SREG_DS; |
1c73ef66 | 1138 | |
9b88ae99 | 1139 | if (ctxt->modrm_mod == 3 || (ctxt->d & NoMod)) { |
2dbd0dd7 | 1140 | op->type = OP_REG; |
9dac77fa | 1141 | op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; |
8acb4207 | 1142 | op->addr.reg = decode_register(ctxt, ctxt->modrm_rm, |
aa9ac1a6 | 1143 | ctxt->d & ByteOp); |
9dac77fa | 1144 | if (ctxt->d & Sse) { |
1253791d AK |
1145 | op->type = OP_XMM; |
1146 | op->bytes = 16; | |
9dac77fa AK |
1147 | op->addr.xmm = ctxt->modrm_rm; |
1148 | read_sse_reg(ctxt, &op->vec_val, ctxt->modrm_rm); | |
1253791d AK |
1149 | return rc; |
1150 | } | |
cbe2c9d3 AK |
1151 | if (ctxt->d & Mmx) { |
1152 | op->type = OP_MM; | |
1153 | op->bytes = 8; | |
bdc90722 | 1154 | op->addr.mm = ctxt->modrm_rm & 7; |
cbe2c9d3 AK |
1155 | return rc; |
1156 | } | |
2dbd0dd7 | 1157 | fetch_register_operand(op); |
1c73ef66 AK |
1158 | return rc; |
1159 | } | |
1160 | ||
2dbd0dd7 AK |
1161 | op->type = OP_MEM; |
1162 | ||
9dac77fa | 1163 | if (ctxt->ad_bytes == 2) { |
dd856efa AK |
1164 | unsigned bx = reg_read(ctxt, VCPU_REGS_RBX); |
1165 | unsigned bp = reg_read(ctxt, VCPU_REGS_RBP); | |
1166 | unsigned si = reg_read(ctxt, VCPU_REGS_RSI); | |
1167 | unsigned di = reg_read(ctxt, VCPU_REGS_RDI); | |
1c73ef66 AK |
1168 | |
1169 | /* 16-bit ModR/M decode. */ | |
9dac77fa | 1170 | switch (ctxt->modrm_mod) { |
1c73ef66 | 1171 | case 0: |
9dac77fa | 1172 | if (ctxt->modrm_rm == 6) |
e85a1085 | 1173 | modrm_ea += insn_fetch(u16, ctxt); |
1c73ef66 AK |
1174 | break; |
1175 | case 1: | |
e85a1085 | 1176 | modrm_ea += insn_fetch(s8, ctxt); |
1c73ef66 AK |
1177 | break; |
1178 | case 2: | |
e85a1085 | 1179 | modrm_ea += insn_fetch(u16, ctxt); |
1c73ef66 AK |
1180 | break; |
1181 | } | |
9dac77fa | 1182 | switch (ctxt->modrm_rm) { |
1c73ef66 | 1183 | case 0: |
2dbd0dd7 | 1184 | modrm_ea += bx + si; |
1c73ef66 AK |
1185 | break; |
1186 | case 1: | |
2dbd0dd7 | 1187 | modrm_ea += bx + di; |
1c73ef66 AK |
1188 | break; |
1189 | case 2: | |
2dbd0dd7 | 1190 | modrm_ea += bp + si; |
1c73ef66 AK |
1191 | break; |
1192 | case 3: | |
2dbd0dd7 | 1193 | modrm_ea += bp + di; |
1c73ef66 AK |
1194 | break; |
1195 | case 4: | |
2dbd0dd7 | 1196 | modrm_ea += si; |
1c73ef66 AK |
1197 | break; |
1198 | case 5: | |
2dbd0dd7 | 1199 | modrm_ea += di; |
1c73ef66 AK |
1200 | break; |
1201 | case 6: | |
9dac77fa | 1202 | if (ctxt->modrm_mod != 0) |
2dbd0dd7 | 1203 | modrm_ea += bp; |
1c73ef66 AK |
1204 | break; |
1205 | case 7: | |
2dbd0dd7 | 1206 | modrm_ea += bx; |
1c73ef66 AK |
1207 | break; |
1208 | } | |
9dac77fa AK |
1209 | if (ctxt->modrm_rm == 2 || ctxt->modrm_rm == 3 || |
1210 | (ctxt->modrm_rm == 6 && ctxt->modrm_mod != 0)) | |
1211 | ctxt->modrm_seg = VCPU_SREG_SS; | |
2dbd0dd7 | 1212 | modrm_ea = (u16)modrm_ea; |
1c73ef66 AK |
1213 | } else { |
1214 | /* 32/64-bit ModR/M decode. */ | |
9dac77fa | 1215 | if ((ctxt->modrm_rm & 7) == 4) { |
e85a1085 | 1216 | sib = insn_fetch(u8, ctxt); |
1c73ef66 AK |
1217 | index_reg |= (sib >> 3) & 7; |
1218 | base_reg |= sib & 7; | |
1219 | scale = sib >> 6; | |
1220 | ||
9dac77fa | 1221 | if ((base_reg & 7) == 5 && ctxt->modrm_mod == 0) |
e85a1085 | 1222 | modrm_ea += insn_fetch(s32, ctxt); |
a6e3407b | 1223 | else { |
dd856efa | 1224 | modrm_ea += reg_read(ctxt, base_reg); |
a6e3407b AK |
1225 | adjust_modrm_seg(ctxt, base_reg); |
1226 | } | |
dc71d0f1 | 1227 | if (index_reg != 4) |
dd856efa | 1228 | modrm_ea += reg_read(ctxt, index_reg) << scale; |
9dac77fa | 1229 | } else if ((ctxt->modrm_rm & 7) == 5 && ctxt->modrm_mod == 0) { |
5b38ab87 | 1230 | modrm_ea += insn_fetch(s32, ctxt); |
84411d85 | 1231 | if (ctxt->mode == X86EMUL_MODE_PROT64) |
9dac77fa | 1232 | ctxt->rip_relative = 1; |
a6e3407b AK |
1233 | } else { |
1234 | base_reg = ctxt->modrm_rm; | |
dd856efa | 1235 | modrm_ea += reg_read(ctxt, base_reg); |
a6e3407b AK |
1236 | adjust_modrm_seg(ctxt, base_reg); |
1237 | } | |
9dac77fa | 1238 | switch (ctxt->modrm_mod) { |
1c73ef66 | 1239 | case 1: |
e85a1085 | 1240 | modrm_ea += insn_fetch(s8, ctxt); |
1c73ef66 AK |
1241 | break; |
1242 | case 2: | |
e85a1085 | 1243 | modrm_ea += insn_fetch(s32, ctxt); |
1c73ef66 AK |
1244 | break; |
1245 | } | |
1246 | } | |
90de84f5 | 1247 | op->addr.mem.ea = modrm_ea; |
41061cdb BD |
1248 | if (ctxt->ad_bytes != 8) |
1249 | ctxt->memop.addr.mem.ea = (u32)ctxt->memop.addr.mem.ea; | |
1250 | ||
1c73ef66 AK |
1251 | done: |
1252 | return rc; | |
1253 | } | |
1254 | ||
1255 | static int decode_abs(struct x86_emulate_ctxt *ctxt, | |
2dbd0dd7 | 1256 | struct operand *op) |
1c73ef66 | 1257 | { |
3e2815e9 | 1258 | int rc = X86EMUL_CONTINUE; |
1c73ef66 | 1259 | |
2dbd0dd7 | 1260 | op->type = OP_MEM; |
9dac77fa | 1261 | switch (ctxt->ad_bytes) { |
1c73ef66 | 1262 | case 2: |
e85a1085 | 1263 | op->addr.mem.ea = insn_fetch(u16, ctxt); |
1c73ef66 AK |
1264 | break; |
1265 | case 4: | |
e85a1085 | 1266 | op->addr.mem.ea = insn_fetch(u32, ctxt); |
1c73ef66 AK |
1267 | break; |
1268 | case 8: | |
e85a1085 | 1269 | op->addr.mem.ea = insn_fetch(u64, ctxt); |
1c73ef66 AK |
1270 | break; |
1271 | } | |
1272 | done: | |
1273 | return rc; | |
1274 | } | |
1275 | ||
9dac77fa | 1276 | static void fetch_bit_operand(struct x86_emulate_ctxt *ctxt) |
35c843c4 | 1277 | { |
7129eeca | 1278 | long sv = 0, mask; |
35c843c4 | 1279 | |
9dac77fa | 1280 | if (ctxt->dst.type == OP_MEM && ctxt->src.type == OP_REG) { |
7dec5603 | 1281 | mask = ~((long)ctxt->dst.bytes * 8 - 1); |
35c843c4 | 1282 | |
9dac77fa AK |
1283 | if (ctxt->src.bytes == 2) |
1284 | sv = (s16)ctxt->src.val & (s16)mask; | |
1285 | else if (ctxt->src.bytes == 4) | |
1286 | sv = (s32)ctxt->src.val & (s32)mask; | |
7dec5603 NA |
1287 | else |
1288 | sv = (s64)ctxt->src.val & (s64)mask; | |
35c843c4 | 1289 | |
1c1c35ae NA |
1290 | ctxt->dst.addr.mem.ea = address_mask(ctxt, |
1291 | ctxt->dst.addr.mem.ea + (sv >> 3)); | |
35c843c4 | 1292 | } |
ba7ff2b7 WY |
1293 | |
1294 | /* only subword offset */ | |
9dac77fa | 1295 | ctxt->src.val &= (ctxt->dst.bytes << 3) - 1; |
35c843c4 WY |
1296 | } |
1297 | ||
dde7e6d1 | 1298 | static int read_emulated(struct x86_emulate_ctxt *ctxt, |
dde7e6d1 | 1299 | unsigned long addr, void *dest, unsigned size) |
6aa8b732 | 1300 | { |
dde7e6d1 | 1301 | int rc; |
9dac77fa | 1302 | struct read_cache *mc = &ctxt->mem_read; |
6aa8b732 | 1303 | |
f23b070e XG |
1304 | if (mc->pos < mc->end) |
1305 | goto read_cached; | |
6aa8b732 | 1306 | |
f23b070e XG |
1307 | WARN_ON((mc->end + size) >= sizeof(mc->data)); |
1308 | ||
1309 | rc = ctxt->ops->read_emulated(ctxt, addr, mc->data + mc->end, size, | |
1310 | &ctxt->exception); | |
1311 | if (rc != X86EMUL_CONTINUE) | |
1312 | return rc; | |
1313 | ||
1314 | mc->end += size; | |
1315 | ||
1316 | read_cached: | |
1317 | memcpy(dest, mc->data + mc->pos, size); | |
1318 | mc->pos += size; | |
dde7e6d1 AK |
1319 | return X86EMUL_CONTINUE; |
1320 | } | |
6aa8b732 | 1321 | |
3ca3ac4d AK |
1322 | static int segmented_read(struct x86_emulate_ctxt *ctxt, |
1323 | struct segmented_address addr, | |
1324 | void *data, | |
1325 | unsigned size) | |
1326 | { | |
9fa088f4 AK |
1327 | int rc; |
1328 | ulong linear; | |
1329 | ||
83b8795a | 1330 | rc = linearize(ctxt, addr, size, false, &linear); |
9fa088f4 AK |
1331 | if (rc != X86EMUL_CONTINUE) |
1332 | return rc; | |
7b105ca2 | 1333 | return read_emulated(ctxt, linear, data, size); |
3ca3ac4d AK |
1334 | } |
1335 | ||
1336 | static int segmented_write(struct x86_emulate_ctxt *ctxt, | |
1337 | struct segmented_address addr, | |
1338 | const void *data, | |
1339 | unsigned size) | |
1340 | { | |
9fa088f4 AK |
1341 | int rc; |
1342 | ulong linear; | |
1343 | ||
83b8795a | 1344 | rc = linearize(ctxt, addr, size, true, &linear); |
9fa088f4 AK |
1345 | if (rc != X86EMUL_CONTINUE) |
1346 | return rc; | |
0f65dd70 AK |
1347 | return ctxt->ops->write_emulated(ctxt, linear, data, size, |
1348 | &ctxt->exception); | |
3ca3ac4d AK |
1349 | } |
1350 | ||
1351 | static int segmented_cmpxchg(struct x86_emulate_ctxt *ctxt, | |
1352 | struct segmented_address addr, | |
1353 | const void *orig_data, const void *data, | |
1354 | unsigned size) | |
1355 | { | |
9fa088f4 AK |
1356 | int rc; |
1357 | ulong linear; | |
1358 | ||
83b8795a | 1359 | rc = linearize(ctxt, addr, size, true, &linear); |
9fa088f4 AK |
1360 | if (rc != X86EMUL_CONTINUE) |
1361 | return rc; | |
0f65dd70 AK |
1362 | return ctxt->ops->cmpxchg_emulated(ctxt, linear, orig_data, data, |
1363 | size, &ctxt->exception); | |
3ca3ac4d AK |
1364 | } |
1365 | ||
dde7e6d1 | 1366 | static int pio_in_emulated(struct x86_emulate_ctxt *ctxt, |
dde7e6d1 AK |
1367 | unsigned int size, unsigned short port, |
1368 | void *dest) | |
1369 | { | |
9dac77fa | 1370 | struct read_cache *rc = &ctxt->io_read; |
b4c6abfe | 1371 | |
dde7e6d1 | 1372 | if (rc->pos == rc->end) { /* refill pio read ahead */ |
dde7e6d1 | 1373 | unsigned int in_page, n; |
9dac77fa | 1374 | unsigned int count = ctxt->rep_prefix ? |
dd856efa | 1375 | address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) : 1; |
dde7e6d1 | 1376 | in_page = (ctxt->eflags & EFLG_DF) ? |
dd856efa AK |
1377 | offset_in_page(reg_read(ctxt, VCPU_REGS_RDI)) : |
1378 | PAGE_SIZE - offset_in_page(reg_read(ctxt, VCPU_REGS_RDI)); | |
b55a8144 | 1379 | n = min3(in_page, (unsigned int)sizeof(rc->data) / size, count); |
dde7e6d1 AK |
1380 | if (n == 0) |
1381 | n = 1; | |
1382 | rc->pos = rc->end = 0; | |
7b105ca2 | 1383 | if (!ctxt->ops->pio_in_emulated(ctxt, size, port, rc->data, n)) |
dde7e6d1 AK |
1384 | return 0; |
1385 | rc->end = n * size; | |
6aa8b732 AK |
1386 | } |
1387 | ||
e6e39f04 NA |
1388 | if (ctxt->rep_prefix && (ctxt->d & String) && |
1389 | !(ctxt->eflags & EFLG_DF)) { | |
b3356bf0 GN |
1390 | ctxt->dst.data = rc->data + rc->pos; |
1391 | ctxt->dst.type = OP_MEM_STR; | |
1392 | ctxt->dst.count = (rc->end - rc->pos) / size; | |
1393 | rc->pos = rc->end; | |
1394 | } else { | |
1395 | memcpy(dest, rc->data + rc->pos, size); | |
1396 | rc->pos += size; | |
1397 | } | |
dde7e6d1 AK |
1398 | return 1; |
1399 | } | |
6aa8b732 | 1400 | |
7f3d35fd KW |
1401 | static int read_interrupt_descriptor(struct x86_emulate_ctxt *ctxt, |
1402 | u16 index, struct desc_struct *desc) | |
1403 | { | |
1404 | struct desc_ptr dt; | |
1405 | ulong addr; | |
1406 | ||
1407 | ctxt->ops->get_idt(ctxt, &dt); | |
1408 | ||
1409 | if (dt.size < index * 8 + 7) | |
1410 | return emulate_gp(ctxt, index << 3 | 0x2); | |
1411 | ||
1412 | addr = dt.address + index * 8; | |
1413 | return ctxt->ops->read_std(ctxt, addr, desc, sizeof *desc, | |
1414 | &ctxt->exception); | |
1415 | } | |
1416 | ||
dde7e6d1 | 1417 | static void get_descriptor_table_ptr(struct x86_emulate_ctxt *ctxt, |
dde7e6d1 AK |
1418 | u16 selector, struct desc_ptr *dt) |
1419 | { | |
0225fb50 | 1420 | const struct x86_emulate_ops *ops = ctxt->ops; |
2eedcac8 | 1421 | u32 base3 = 0; |
7b105ca2 | 1422 | |
dde7e6d1 AK |
1423 | if (selector & 1 << 2) { |
1424 | struct desc_struct desc; | |
1aa36616 AK |
1425 | u16 sel; |
1426 | ||
dde7e6d1 | 1427 | memset (dt, 0, sizeof *dt); |
2eedcac8 NA |
1428 | if (!ops->get_segment(ctxt, &sel, &desc, &base3, |
1429 | VCPU_SREG_LDTR)) | |
dde7e6d1 | 1430 | return; |
e09d082c | 1431 | |
dde7e6d1 | 1432 | dt->size = desc_limit_scaled(&desc); /* what if limit > 65535? */ |
2eedcac8 | 1433 | dt->address = get_desc_base(&desc) | ((u64)base3 << 32); |
dde7e6d1 | 1434 | } else |
4bff1e86 | 1435 | ops->get_gdt(ctxt, dt); |
dde7e6d1 | 1436 | } |
120df890 | 1437 | |
dde7e6d1 AK |
1438 | /* allowed just for 8 bytes segments */ |
1439 | static int read_segment_descriptor(struct x86_emulate_ctxt *ctxt, | |
e919464b AK |
1440 | u16 selector, struct desc_struct *desc, |
1441 | ulong *desc_addr_p) | |
dde7e6d1 AK |
1442 | { |
1443 | struct desc_ptr dt; | |
1444 | u16 index = selector >> 3; | |
dde7e6d1 | 1445 | ulong addr; |
120df890 | 1446 | |
7b105ca2 | 1447 | get_descriptor_table_ptr(ctxt, selector, &dt); |
120df890 | 1448 | |
35d3d4a1 AK |
1449 | if (dt.size < index * 8 + 7) |
1450 | return emulate_gp(ctxt, selector & 0xfffc); | |
e09d082c | 1451 | |
e919464b | 1452 | *desc_addr_p = addr = dt.address + index * 8; |
7b105ca2 TY |
1453 | return ctxt->ops->read_std(ctxt, addr, desc, sizeof *desc, |
1454 | &ctxt->exception); | |
dde7e6d1 | 1455 | } |
ef65c889 | 1456 | |
dde7e6d1 AK |
1457 | /* allowed just for 8 bytes segments */ |
1458 | static int write_segment_descriptor(struct x86_emulate_ctxt *ctxt, | |
dde7e6d1 AK |
1459 | u16 selector, struct desc_struct *desc) |
1460 | { | |
1461 | struct desc_ptr dt; | |
1462 | u16 index = selector >> 3; | |
dde7e6d1 | 1463 | ulong addr; |
6aa8b732 | 1464 | |
7b105ca2 | 1465 | get_descriptor_table_ptr(ctxt, selector, &dt); |
6e3d5dfb | 1466 | |
35d3d4a1 AK |
1467 | if (dt.size < index * 8 + 7) |
1468 | return emulate_gp(ctxt, selector & 0xfffc); | |
6aa8b732 | 1469 | |
dde7e6d1 | 1470 | addr = dt.address + index * 8; |
7b105ca2 TY |
1471 | return ctxt->ops->write_std(ctxt, addr, desc, sizeof *desc, |
1472 | &ctxt->exception); | |
dde7e6d1 | 1473 | } |
c7e75a3d | 1474 | |
5601d05b | 1475 | /* Does not support long mode */ |
2356aaeb | 1476 | static int __load_segment_descriptor(struct x86_emulate_ctxt *ctxt, |
d1442d85 NA |
1477 | u16 selector, int seg, u8 cpl, |
1478 | bool in_task_switch, | |
1479 | struct desc_struct *desc) | |
dde7e6d1 | 1480 | { |
869be99c | 1481 | struct desc_struct seg_desc, old_desc; |
2356aaeb | 1482 | u8 dpl, rpl; |
dde7e6d1 AK |
1483 | unsigned err_vec = GP_VECTOR; |
1484 | u32 err_code = 0; | |
1485 | bool null_selector = !(selector & ~0x3); /* 0000-0003 are null */ | |
e919464b | 1486 | ulong desc_addr; |
dde7e6d1 | 1487 | int ret; |
03ebebeb | 1488 | u16 dummy; |
e37a75a1 | 1489 | u32 base3 = 0; |
69f55cb1 | 1490 | |
dde7e6d1 | 1491 | memset(&seg_desc, 0, sizeof seg_desc); |
69f55cb1 | 1492 | |
f8da94e9 KW |
1493 | if (ctxt->mode == X86EMUL_MODE_REAL) { |
1494 | /* set real mode segment descriptor (keep limit etc. for | |
1495 | * unreal mode) */ | |
03ebebeb | 1496 | ctxt->ops->get_segment(ctxt, &dummy, &seg_desc, NULL, seg); |
dde7e6d1 | 1497 | set_desc_base(&seg_desc, selector << 4); |
dde7e6d1 | 1498 | goto load; |
f8da94e9 KW |
1499 | } else if (seg <= VCPU_SREG_GS && ctxt->mode == X86EMUL_MODE_VM86) { |
1500 | /* VM86 needs a clean new segment descriptor */ | |
1501 | set_desc_base(&seg_desc, selector << 4); | |
1502 | set_desc_limit(&seg_desc, 0xffff); | |
1503 | seg_desc.type = 3; | |
1504 | seg_desc.p = 1; | |
1505 | seg_desc.s = 1; | |
1506 | seg_desc.dpl = 3; | |
1507 | goto load; | |
dde7e6d1 AK |
1508 | } |
1509 | ||
79d5b4c3 | 1510 | rpl = selector & 3; |
79d5b4c3 AK |
1511 | |
1512 | /* NULL selector is not valid for TR, CS and SS (except for long mode) */ | |
1513 | if ((seg == VCPU_SREG_CS | |
1514 | || (seg == VCPU_SREG_SS | |
1515 | && (ctxt->mode != X86EMUL_MODE_PROT64 || rpl != cpl)) | |
1516 | || seg == VCPU_SREG_TR) | |
dde7e6d1 AK |
1517 | && null_selector) |
1518 | goto exception; | |
1519 | ||
1520 | /* TR should be in GDT only */ | |
1521 | if (seg == VCPU_SREG_TR && (selector & (1 << 2))) | |
1522 | goto exception; | |
1523 | ||
1524 | if (null_selector) /* for NULL selector skip all following checks */ | |
1525 | goto load; | |
1526 | ||
e919464b | 1527 | ret = read_segment_descriptor(ctxt, selector, &seg_desc, &desc_addr); |
dde7e6d1 AK |
1528 | if (ret != X86EMUL_CONTINUE) |
1529 | return ret; | |
1530 | ||
1531 | err_code = selector & 0xfffc; | |
15fc0752 | 1532 | err_vec = in_task_switch ? TS_VECTOR : GP_VECTOR; |
dde7e6d1 | 1533 | |
fc058680 | 1534 | /* can't load system descriptor into segment selector */ |
dde7e6d1 AK |
1535 | if (seg <= VCPU_SREG_GS && !seg_desc.s) |
1536 | goto exception; | |
1537 | ||
1538 | if (!seg_desc.p) { | |
1539 | err_vec = (seg == VCPU_SREG_SS) ? SS_VECTOR : NP_VECTOR; | |
1540 | goto exception; | |
1541 | } | |
1542 | ||
dde7e6d1 | 1543 | dpl = seg_desc.dpl; |
dde7e6d1 AK |
1544 | |
1545 | switch (seg) { | |
1546 | case VCPU_SREG_SS: | |
1547 | /* | |
1548 | * segment is not a writable data segment or segment | |
1549 | * selector's RPL != CPL or segment selector's RPL != CPL | |
1550 | */ | |
1551 | if (rpl != cpl || (seg_desc.type & 0xa) != 0x2 || dpl != cpl) | |
1552 | goto exception; | |
6aa8b732 | 1553 | break; |
dde7e6d1 AK |
1554 | case VCPU_SREG_CS: |
1555 | if (!(seg_desc.type & 8)) | |
1556 | goto exception; | |
1557 | ||
1558 | if (seg_desc.type & 4) { | |
1559 | /* conforming */ | |
1560 | if (dpl > cpl) | |
1561 | goto exception; | |
1562 | } else { | |
1563 | /* nonconforming */ | |
1564 | if (rpl > cpl || dpl != cpl) | |
1565 | goto exception; | |
1566 | } | |
040c8dc8 NA |
1567 | /* in long-mode d/b must be clear if l is set */ |
1568 | if (seg_desc.d && seg_desc.l) { | |
1569 | u64 efer = 0; | |
1570 | ||
1571 | ctxt->ops->get_msr(ctxt, MSR_EFER, &efer); | |
1572 | if (efer & EFER_LMA) | |
1573 | goto exception; | |
1574 | } | |
1575 | ||
dde7e6d1 AK |
1576 | /* CS(RPL) <- CPL */ |
1577 | selector = (selector & 0xfffc) | cpl; | |
6aa8b732 | 1578 | break; |
dde7e6d1 AK |
1579 | case VCPU_SREG_TR: |
1580 | if (seg_desc.s || (seg_desc.type != 1 && seg_desc.type != 9)) | |
1581 | goto exception; | |
869be99c AK |
1582 | old_desc = seg_desc; |
1583 | seg_desc.type |= 2; /* busy */ | |
1584 | ret = ctxt->ops->cmpxchg_emulated(ctxt, desc_addr, &old_desc, &seg_desc, | |
1585 | sizeof(seg_desc), &ctxt->exception); | |
1586 | if (ret != X86EMUL_CONTINUE) | |
1587 | return ret; | |
dde7e6d1 AK |
1588 | break; |
1589 | case VCPU_SREG_LDTR: | |
1590 | if (seg_desc.s || seg_desc.type != 2) | |
1591 | goto exception; | |
1592 | break; | |
1593 | default: /* DS, ES, FS, or GS */ | |
4e62417b | 1594 | /* |
dde7e6d1 AK |
1595 | * segment is not a data or readable code segment or |
1596 | * ((segment is a data or nonconforming code segment) | |
1597 | * and (both RPL and CPL > DPL)) | |
4e62417b | 1598 | */ |
dde7e6d1 AK |
1599 | if ((seg_desc.type & 0xa) == 0x8 || |
1600 | (((seg_desc.type & 0xc) != 0xc) && | |
1601 | (rpl > dpl && cpl > dpl))) | |
1602 | goto exception; | |
6aa8b732 | 1603 | break; |
dde7e6d1 AK |
1604 | } |
1605 | ||
1606 | if (seg_desc.s) { | |
1607 | /* mark segment as accessed */ | |
1608 | seg_desc.type |= 1; | |
7b105ca2 | 1609 | ret = write_segment_descriptor(ctxt, selector, &seg_desc); |
dde7e6d1 AK |
1610 | if (ret != X86EMUL_CONTINUE) |
1611 | return ret; | |
e37a75a1 NA |
1612 | } else if (ctxt->mode == X86EMUL_MODE_PROT64) { |
1613 | ret = ctxt->ops->read_std(ctxt, desc_addr+8, &base3, | |
1614 | sizeof(base3), &ctxt->exception); | |
1615 | if (ret != X86EMUL_CONTINUE) | |
1616 | return ret; | |
9a9abf6b NA |
1617 | if (is_noncanonical_address(get_desc_base(&seg_desc) | |
1618 | ((u64)base3 << 32))) | |
1619 | return emulate_gp(ctxt, 0); | |
dde7e6d1 AK |
1620 | } |
1621 | load: | |
e37a75a1 | 1622 | ctxt->ops->set_segment(ctxt, selector, &seg_desc, base3, seg); |
d1442d85 NA |
1623 | if (desc) |
1624 | *desc = seg_desc; | |
dde7e6d1 AK |
1625 | return X86EMUL_CONTINUE; |
1626 | exception: | |
592f0858 | 1627 | return emulate_exception(ctxt, err_vec, err_code, true); |
dde7e6d1 AK |
1628 | } |
1629 | ||
2356aaeb PB |
1630 | static int load_segment_descriptor(struct x86_emulate_ctxt *ctxt, |
1631 | u16 selector, int seg) | |
1632 | { | |
1633 | u8 cpl = ctxt->ops->cpl(ctxt); | |
d1442d85 | 1634 | return __load_segment_descriptor(ctxt, selector, seg, cpl, false, NULL); |
2356aaeb PB |
1635 | } |
1636 | ||
31be40b3 WY |
1637 | static void write_register_operand(struct operand *op) |
1638 | { | |
1639 | /* The 4-byte case *is* correct: in 64-bit mode we zero-extend. */ | |
1640 | switch (op->bytes) { | |
1641 | case 1: | |
1642 | *(u8 *)op->addr.reg = (u8)op->val; | |
1643 | break; | |
1644 | case 2: | |
1645 | *(u16 *)op->addr.reg = (u16)op->val; | |
1646 | break; | |
1647 | case 4: | |
1648 | *op->addr.reg = (u32)op->val; | |
1649 | break; /* 64b: zero-extend */ | |
1650 | case 8: | |
1651 | *op->addr.reg = op->val; | |
1652 | break; | |
1653 | } | |
1654 | } | |
1655 | ||
fb32b1ed | 1656 | static int writeback(struct x86_emulate_ctxt *ctxt, struct operand *op) |
dde7e6d1 | 1657 | { |
fb32b1ed | 1658 | switch (op->type) { |
dde7e6d1 | 1659 | case OP_REG: |
fb32b1ed | 1660 | write_register_operand(op); |
6aa8b732 | 1661 | break; |
dde7e6d1 | 1662 | case OP_MEM: |
9dac77fa | 1663 | if (ctxt->lock_prefix) |
f5f87dfb PB |
1664 | return segmented_cmpxchg(ctxt, |
1665 | op->addr.mem, | |
1666 | &op->orig_val, | |
1667 | &op->val, | |
1668 | op->bytes); | |
1669 | else | |
1670 | return segmented_write(ctxt, | |
fb32b1ed | 1671 | op->addr.mem, |
fb32b1ed AK |
1672 | &op->val, |
1673 | op->bytes); | |
a682e354 | 1674 | break; |
b3356bf0 | 1675 | case OP_MEM_STR: |
f5f87dfb PB |
1676 | return segmented_write(ctxt, |
1677 | op->addr.mem, | |
1678 | op->data, | |
1679 | op->bytes * op->count); | |
b3356bf0 | 1680 | break; |
1253791d | 1681 | case OP_XMM: |
fb32b1ed | 1682 | write_sse_reg(ctxt, &op->vec_val, op->addr.xmm); |
1253791d | 1683 | break; |
cbe2c9d3 | 1684 | case OP_MM: |
fb32b1ed | 1685 | write_mmx_reg(ctxt, &op->mm_val, op->addr.mm); |
cbe2c9d3 | 1686 | break; |
dde7e6d1 AK |
1687 | case OP_NONE: |
1688 | /* no writeback */ | |
414e6277 | 1689 | break; |
dde7e6d1 | 1690 | default: |
414e6277 | 1691 | break; |
6aa8b732 | 1692 | } |
dde7e6d1 AK |
1693 | return X86EMUL_CONTINUE; |
1694 | } | |
6aa8b732 | 1695 | |
51ddff50 | 1696 | static int push(struct x86_emulate_ctxt *ctxt, void *data, int bytes) |
dde7e6d1 | 1697 | { |
4179bb02 | 1698 | struct segmented_address addr; |
0dc8d10f | 1699 | |
5ad105e5 | 1700 | rsp_increment(ctxt, -bytes); |
dd856efa | 1701 | addr.ea = reg_read(ctxt, VCPU_REGS_RSP) & stack_mask(ctxt); |
4179bb02 TY |
1702 | addr.seg = VCPU_SREG_SS; |
1703 | ||
51ddff50 AK |
1704 | return segmented_write(ctxt, addr, data, bytes); |
1705 | } | |
1706 | ||
1707 | static int em_push(struct x86_emulate_ctxt *ctxt) | |
1708 | { | |
4179bb02 | 1709 | /* Disable writeback. */ |
9dac77fa | 1710 | ctxt->dst.type = OP_NONE; |
51ddff50 | 1711 | return push(ctxt, &ctxt->src.val, ctxt->op_bytes); |
dde7e6d1 | 1712 | } |
69f55cb1 | 1713 | |
dde7e6d1 | 1714 | static int emulate_pop(struct x86_emulate_ctxt *ctxt, |
dde7e6d1 AK |
1715 | void *dest, int len) |
1716 | { | |
dde7e6d1 | 1717 | int rc; |
90de84f5 | 1718 | struct segmented_address addr; |
8b4caf66 | 1719 | |
dd856efa | 1720 | addr.ea = reg_read(ctxt, VCPU_REGS_RSP) & stack_mask(ctxt); |
90de84f5 | 1721 | addr.seg = VCPU_SREG_SS; |
3ca3ac4d | 1722 | rc = segmented_read(ctxt, addr, dest, len); |
dde7e6d1 AK |
1723 | if (rc != X86EMUL_CONTINUE) |
1724 | return rc; | |
1725 | ||
5ad105e5 | 1726 | rsp_increment(ctxt, len); |
dde7e6d1 | 1727 | return rc; |
8b4caf66 LV |
1728 | } |
1729 | ||
c54fe504 TY |
1730 | static int em_pop(struct x86_emulate_ctxt *ctxt) |
1731 | { | |
9dac77fa | 1732 | return emulate_pop(ctxt, &ctxt->dst.val, ctxt->op_bytes); |
c54fe504 TY |
1733 | } |
1734 | ||
dde7e6d1 | 1735 | static int emulate_popf(struct x86_emulate_ctxt *ctxt, |
7b105ca2 | 1736 | void *dest, int len) |
9de41573 GN |
1737 | { |
1738 | int rc; | |
dde7e6d1 AK |
1739 | unsigned long val, change_mask; |
1740 | int iopl = (ctxt->eflags & X86_EFLAGS_IOPL) >> IOPL_SHIFT; | |
7b105ca2 | 1741 | int cpl = ctxt->ops->cpl(ctxt); |
9de41573 | 1742 | |
3b9be3bf | 1743 | rc = emulate_pop(ctxt, &val, len); |
dde7e6d1 AK |
1744 | if (rc != X86EMUL_CONTINUE) |
1745 | return rc; | |
9de41573 | 1746 | |
dde7e6d1 | 1747 | change_mask = EFLG_CF | EFLG_PF | EFLG_AF | EFLG_ZF | EFLG_SF | EFLG_OF |
163b135e | 1748 | | EFLG_TF | EFLG_DF | EFLG_NT | EFLG_AC | EFLG_ID; |
9de41573 | 1749 | |
dde7e6d1 AK |
1750 | switch(ctxt->mode) { |
1751 | case X86EMUL_MODE_PROT64: | |
1752 | case X86EMUL_MODE_PROT32: | |
1753 | case X86EMUL_MODE_PROT16: | |
1754 | if (cpl == 0) | |
1755 | change_mask |= EFLG_IOPL; | |
1756 | if (cpl <= iopl) | |
1757 | change_mask |= EFLG_IF; | |
1758 | break; | |
1759 | case X86EMUL_MODE_VM86: | |
35d3d4a1 AK |
1760 | if (iopl < 3) |
1761 | return emulate_gp(ctxt, 0); | |
dde7e6d1 AK |
1762 | change_mask |= EFLG_IF; |
1763 | break; | |
1764 | default: /* real mode */ | |
1765 | change_mask |= (EFLG_IOPL | EFLG_IF); | |
1766 | break; | |
9de41573 | 1767 | } |
dde7e6d1 AK |
1768 | |
1769 | *(unsigned long *)dest = | |
1770 | (ctxt->eflags & ~change_mask) | (val & change_mask); | |
1771 | ||
1772 | return rc; | |
9de41573 GN |
1773 | } |
1774 | ||
62aaa2f0 TY |
1775 | static int em_popf(struct x86_emulate_ctxt *ctxt) |
1776 | { | |
9dac77fa AK |
1777 | ctxt->dst.type = OP_REG; |
1778 | ctxt->dst.addr.reg = &ctxt->eflags; | |
1779 | ctxt->dst.bytes = ctxt->op_bytes; | |
1780 | return emulate_popf(ctxt, &ctxt->dst.val, ctxt->op_bytes); | |
62aaa2f0 TY |
1781 | } |
1782 | ||
612e89f0 AK |
1783 | static int em_enter(struct x86_emulate_ctxt *ctxt) |
1784 | { | |
1785 | int rc; | |
1786 | unsigned frame_size = ctxt->src.val; | |
1787 | unsigned nesting_level = ctxt->src2.val & 31; | |
dd856efa | 1788 | ulong rbp; |
612e89f0 AK |
1789 | |
1790 | if (nesting_level) | |
1791 | return X86EMUL_UNHANDLEABLE; | |
1792 | ||
dd856efa AK |
1793 | rbp = reg_read(ctxt, VCPU_REGS_RBP); |
1794 | rc = push(ctxt, &rbp, stack_size(ctxt)); | |
612e89f0 AK |
1795 | if (rc != X86EMUL_CONTINUE) |
1796 | return rc; | |
dd856efa | 1797 | assign_masked(reg_rmw(ctxt, VCPU_REGS_RBP), reg_read(ctxt, VCPU_REGS_RSP), |
612e89f0 | 1798 | stack_mask(ctxt)); |
dd856efa AK |
1799 | assign_masked(reg_rmw(ctxt, VCPU_REGS_RSP), |
1800 | reg_read(ctxt, VCPU_REGS_RSP) - frame_size, | |
612e89f0 AK |
1801 | stack_mask(ctxt)); |
1802 | return X86EMUL_CONTINUE; | |
1803 | } | |
1804 | ||
f47cfa31 AK |
1805 | static int em_leave(struct x86_emulate_ctxt *ctxt) |
1806 | { | |
dd856efa | 1807 | assign_masked(reg_rmw(ctxt, VCPU_REGS_RSP), reg_read(ctxt, VCPU_REGS_RBP), |
f47cfa31 | 1808 | stack_mask(ctxt)); |
dd856efa | 1809 | return emulate_pop(ctxt, reg_rmw(ctxt, VCPU_REGS_RBP), ctxt->op_bytes); |
f47cfa31 AK |
1810 | } |
1811 | ||
1cd196ea | 1812 | static int em_push_sreg(struct x86_emulate_ctxt *ctxt) |
7b262e90 | 1813 | { |
1cd196ea AK |
1814 | int seg = ctxt->src2.val; |
1815 | ||
9dac77fa | 1816 | ctxt->src.val = get_segment_selector(ctxt, seg); |
0fcc207c NA |
1817 | if (ctxt->op_bytes == 4) { |
1818 | rsp_increment(ctxt, -2); | |
1819 | ctxt->op_bytes = 2; | |
1820 | } | |
7b262e90 | 1821 | |
4487b3b4 | 1822 | return em_push(ctxt); |
7b262e90 GN |
1823 | } |
1824 | ||
1cd196ea | 1825 | static int em_pop_sreg(struct x86_emulate_ctxt *ctxt) |
38ba30ba | 1826 | { |
1cd196ea | 1827 | int seg = ctxt->src2.val; |
dde7e6d1 AK |
1828 | unsigned long selector; |
1829 | int rc; | |
38ba30ba | 1830 | |
9dac77fa | 1831 | rc = emulate_pop(ctxt, &selector, ctxt->op_bytes); |
dde7e6d1 AK |
1832 | if (rc != X86EMUL_CONTINUE) |
1833 | return rc; | |
1834 | ||
a5457e7b PB |
1835 | if (ctxt->modrm_reg == VCPU_SREG_SS) |
1836 | ctxt->interruptibility = KVM_X86_SHADOW_INT_MOV_SS; | |
1837 | ||
7b105ca2 | 1838 | rc = load_segment_descriptor(ctxt, (u16)selector, seg); |
dde7e6d1 | 1839 | return rc; |
38ba30ba GN |
1840 | } |
1841 | ||
b96a7fad | 1842 | static int em_pusha(struct x86_emulate_ctxt *ctxt) |
38ba30ba | 1843 | { |
dd856efa | 1844 | unsigned long old_esp = reg_read(ctxt, VCPU_REGS_RSP); |
dde7e6d1 AK |
1845 | int rc = X86EMUL_CONTINUE; |
1846 | int reg = VCPU_REGS_RAX; | |
38ba30ba | 1847 | |
dde7e6d1 AK |
1848 | while (reg <= VCPU_REGS_RDI) { |
1849 | (reg == VCPU_REGS_RSP) ? | |
dd856efa | 1850 | (ctxt->src.val = old_esp) : (ctxt->src.val = reg_read(ctxt, reg)); |
38ba30ba | 1851 | |
4487b3b4 | 1852 | rc = em_push(ctxt); |
dde7e6d1 AK |
1853 | if (rc != X86EMUL_CONTINUE) |
1854 | return rc; | |
38ba30ba | 1855 | |
dde7e6d1 | 1856 | ++reg; |
38ba30ba | 1857 | } |
38ba30ba | 1858 | |
dde7e6d1 | 1859 | return rc; |
38ba30ba GN |
1860 | } |
1861 | ||
62aaa2f0 TY |
1862 | static int em_pushf(struct x86_emulate_ctxt *ctxt) |
1863 | { | |
9dac77fa | 1864 | ctxt->src.val = (unsigned long)ctxt->eflags; |
62aaa2f0 TY |
1865 | return em_push(ctxt); |
1866 | } | |
1867 | ||
b96a7fad | 1868 | static int em_popa(struct x86_emulate_ctxt *ctxt) |
38ba30ba | 1869 | { |
dde7e6d1 AK |
1870 | int rc = X86EMUL_CONTINUE; |
1871 | int reg = VCPU_REGS_RDI; | |
38ba30ba | 1872 | |
dde7e6d1 AK |
1873 | while (reg >= VCPU_REGS_RAX) { |
1874 | if (reg == VCPU_REGS_RSP) { | |
5ad105e5 | 1875 | rsp_increment(ctxt, ctxt->op_bytes); |
dde7e6d1 AK |
1876 | --reg; |
1877 | } | |
38ba30ba | 1878 | |
dd856efa | 1879 | rc = emulate_pop(ctxt, reg_rmw(ctxt, reg), ctxt->op_bytes); |
dde7e6d1 AK |
1880 | if (rc != X86EMUL_CONTINUE) |
1881 | break; | |
1882 | --reg; | |
38ba30ba | 1883 | } |
dde7e6d1 | 1884 | return rc; |
38ba30ba GN |
1885 | } |
1886 | ||
dd856efa | 1887 | static int __emulate_int_real(struct x86_emulate_ctxt *ctxt, int irq) |
6e154e56 | 1888 | { |
0225fb50 | 1889 | const struct x86_emulate_ops *ops = ctxt->ops; |
5c56e1cf | 1890 | int rc; |
6e154e56 MG |
1891 | struct desc_ptr dt; |
1892 | gva_t cs_addr; | |
1893 | gva_t eip_addr; | |
1894 | u16 cs, eip; | |
6e154e56 MG |
1895 | |
1896 | /* TODO: Add limit checks */ | |
9dac77fa | 1897 | ctxt->src.val = ctxt->eflags; |
4487b3b4 | 1898 | rc = em_push(ctxt); |
5c56e1cf AK |
1899 | if (rc != X86EMUL_CONTINUE) |
1900 | return rc; | |
6e154e56 MG |
1901 | |
1902 | ctxt->eflags &= ~(EFLG_IF | EFLG_TF | EFLG_AC); | |
1903 | ||
9dac77fa | 1904 | ctxt->src.val = get_segment_selector(ctxt, VCPU_SREG_CS); |
4487b3b4 | 1905 | rc = em_push(ctxt); |
5c56e1cf AK |
1906 | if (rc != X86EMUL_CONTINUE) |
1907 | return rc; | |
6e154e56 | 1908 | |
9dac77fa | 1909 | ctxt->src.val = ctxt->_eip; |
4487b3b4 | 1910 | rc = em_push(ctxt); |
5c56e1cf AK |
1911 | if (rc != X86EMUL_CONTINUE) |
1912 | return rc; | |
1913 | ||
4bff1e86 | 1914 | ops->get_idt(ctxt, &dt); |
6e154e56 MG |
1915 | |
1916 | eip_addr = dt.address + (irq << 2); | |
1917 | cs_addr = dt.address + (irq << 2) + 2; | |
1918 | ||
0f65dd70 | 1919 | rc = ops->read_std(ctxt, cs_addr, &cs, 2, &ctxt->exception); |
6e154e56 MG |
1920 | if (rc != X86EMUL_CONTINUE) |
1921 | return rc; | |
1922 | ||
0f65dd70 | 1923 | rc = ops->read_std(ctxt, eip_addr, &eip, 2, &ctxt->exception); |
6e154e56 MG |
1924 | if (rc != X86EMUL_CONTINUE) |
1925 | return rc; | |
1926 | ||
7b105ca2 | 1927 | rc = load_segment_descriptor(ctxt, cs, VCPU_SREG_CS); |
6e154e56 MG |
1928 | if (rc != X86EMUL_CONTINUE) |
1929 | return rc; | |
1930 | ||
9dac77fa | 1931 | ctxt->_eip = eip; |
6e154e56 MG |
1932 | |
1933 | return rc; | |
1934 | } | |
1935 | ||
dd856efa AK |
1936 | int emulate_int_real(struct x86_emulate_ctxt *ctxt, int irq) |
1937 | { | |
1938 | int rc; | |
1939 | ||
1940 | invalidate_registers(ctxt); | |
1941 | rc = __emulate_int_real(ctxt, irq); | |
1942 | if (rc == X86EMUL_CONTINUE) | |
1943 | writeback_registers(ctxt); | |
1944 | return rc; | |
1945 | } | |
1946 | ||
7b105ca2 | 1947 | static int emulate_int(struct x86_emulate_ctxt *ctxt, int irq) |
6e154e56 MG |
1948 | { |
1949 | switch(ctxt->mode) { | |
1950 | case X86EMUL_MODE_REAL: | |
dd856efa | 1951 | return __emulate_int_real(ctxt, irq); |
6e154e56 MG |
1952 | case X86EMUL_MODE_VM86: |
1953 | case X86EMUL_MODE_PROT16: | |
1954 | case X86EMUL_MODE_PROT32: | |
1955 | case X86EMUL_MODE_PROT64: | |
1956 | default: | |
1957 | /* Protected mode interrupts unimplemented yet */ | |
1958 | return X86EMUL_UNHANDLEABLE; | |
1959 | } | |
1960 | } | |
1961 | ||
7b105ca2 | 1962 | static int emulate_iret_real(struct x86_emulate_ctxt *ctxt) |
38ba30ba | 1963 | { |
dde7e6d1 AK |
1964 | int rc = X86EMUL_CONTINUE; |
1965 | unsigned long temp_eip = 0; | |
1966 | unsigned long temp_eflags = 0; | |
1967 | unsigned long cs = 0; | |
1968 | unsigned long mask = EFLG_CF | EFLG_PF | EFLG_AF | EFLG_ZF | EFLG_SF | EFLG_TF | | |
1969 | EFLG_IF | EFLG_DF | EFLG_OF | EFLG_IOPL | EFLG_NT | EFLG_RF | | |
1970 | EFLG_AC | EFLG_ID | (1 << 1); /* Last one is the reserved bit */ | |
1971 | unsigned long vm86_mask = EFLG_VM | EFLG_VIF | EFLG_VIP; | |
38ba30ba | 1972 | |
dde7e6d1 | 1973 | /* TODO: Add stack limit check */ |
38ba30ba | 1974 | |
9dac77fa | 1975 | rc = emulate_pop(ctxt, &temp_eip, ctxt->op_bytes); |
38ba30ba | 1976 | |
dde7e6d1 AK |
1977 | if (rc != X86EMUL_CONTINUE) |
1978 | return rc; | |
38ba30ba | 1979 | |
35d3d4a1 AK |
1980 | if (temp_eip & ~0xffff) |
1981 | return emulate_gp(ctxt, 0); | |
38ba30ba | 1982 | |
9dac77fa | 1983 | rc = emulate_pop(ctxt, &cs, ctxt->op_bytes); |
38ba30ba | 1984 | |
dde7e6d1 AK |
1985 | if (rc != X86EMUL_CONTINUE) |
1986 | return rc; | |
38ba30ba | 1987 | |
9dac77fa | 1988 | rc = emulate_pop(ctxt, &temp_eflags, ctxt->op_bytes); |
38ba30ba | 1989 | |
dde7e6d1 AK |
1990 | if (rc != X86EMUL_CONTINUE) |
1991 | return rc; | |
38ba30ba | 1992 | |
7b105ca2 | 1993 | rc = load_segment_descriptor(ctxt, (u16)cs, VCPU_SREG_CS); |
38ba30ba | 1994 | |
dde7e6d1 AK |
1995 | if (rc != X86EMUL_CONTINUE) |
1996 | return rc; | |
38ba30ba | 1997 | |
9dac77fa | 1998 | ctxt->_eip = temp_eip; |
38ba30ba | 1999 | |
38ba30ba | 2000 | |
9dac77fa | 2001 | if (ctxt->op_bytes == 4) |
dde7e6d1 | 2002 | ctxt->eflags = ((temp_eflags & mask) | (ctxt->eflags & vm86_mask)); |
9dac77fa | 2003 | else if (ctxt->op_bytes == 2) { |
dde7e6d1 AK |
2004 | ctxt->eflags &= ~0xffff; |
2005 | ctxt->eflags |= temp_eflags; | |
38ba30ba | 2006 | } |
dde7e6d1 AK |
2007 | |
2008 | ctxt->eflags &= ~EFLG_RESERVED_ZEROS_MASK; /* Clear reserved zeros */ | |
2009 | ctxt->eflags |= EFLG_RESERVED_ONE_MASK; | |
2010 | ||
2011 | return rc; | |
38ba30ba GN |
2012 | } |
2013 | ||
e01991e7 | 2014 | static int em_iret(struct x86_emulate_ctxt *ctxt) |
c37eda13 | 2015 | { |
dde7e6d1 AK |
2016 | switch(ctxt->mode) { |
2017 | case X86EMUL_MODE_REAL: | |
7b105ca2 | 2018 | return emulate_iret_real(ctxt); |
dde7e6d1 AK |
2019 | case X86EMUL_MODE_VM86: |
2020 | case X86EMUL_MODE_PROT16: | |
2021 | case X86EMUL_MODE_PROT32: | |
2022 | case X86EMUL_MODE_PROT64: | |
c37eda13 | 2023 | default: |
dde7e6d1 AK |
2024 | /* iret from protected mode unimplemented yet */ |
2025 | return X86EMUL_UNHANDLEABLE; | |
c37eda13 | 2026 | } |
c37eda13 WY |
2027 | } |
2028 | ||
d2f62766 TY |
2029 | static int em_jmp_far(struct x86_emulate_ctxt *ctxt) |
2030 | { | |
d2f62766 | 2031 | int rc; |
d1442d85 NA |
2032 | unsigned short sel, old_sel; |
2033 | struct desc_struct old_desc, new_desc; | |
2034 | const struct x86_emulate_ops *ops = ctxt->ops; | |
2035 | u8 cpl = ctxt->ops->cpl(ctxt); | |
2036 | ||
2037 | /* Assignment of RIP may only fail in 64-bit mode */ | |
2038 | if (ctxt->mode == X86EMUL_MODE_PROT64) | |
2039 | ops->get_segment(ctxt, &old_sel, &old_desc, NULL, | |
2040 | VCPU_SREG_CS); | |
d2f62766 | 2041 | |
9dac77fa | 2042 | memcpy(&sel, ctxt->src.valptr + ctxt->op_bytes, 2); |
d2f62766 | 2043 | |
d1442d85 NA |
2044 | rc = __load_segment_descriptor(ctxt, sel, VCPU_SREG_CS, cpl, false, |
2045 | &new_desc); | |
d2f62766 TY |
2046 | if (rc != X86EMUL_CONTINUE) |
2047 | return rc; | |
2048 | ||
d50eaa18 | 2049 | rc = assign_eip_far(ctxt, ctxt->src.val, &new_desc); |
d1442d85 | 2050 | if (rc != X86EMUL_CONTINUE) { |
cd9b8e2c | 2051 | WARN_ON(ctxt->mode != X86EMUL_MODE_PROT64); |
d1442d85 NA |
2052 | /* assigning eip failed; restore the old cs */ |
2053 | ops->set_segment(ctxt, old_sel, &old_desc, 0, VCPU_SREG_CS); | |
2054 | return rc; | |
2055 | } | |
2056 | return rc; | |
d2f62766 TY |
2057 | } |
2058 | ||
f7784046 | 2059 | static int em_jmp_abs(struct x86_emulate_ctxt *ctxt) |
8cdbd2c9 | 2060 | { |
f7784046 NA |
2061 | return assign_eip_near(ctxt, ctxt->src.val); |
2062 | } | |
8cdbd2c9 | 2063 | |
f7784046 NA |
2064 | static int em_call_near_abs(struct x86_emulate_ctxt *ctxt) |
2065 | { | |
2066 | int rc; | |
2067 | long int old_eip; | |
2068 | ||
2069 | old_eip = ctxt->_eip; | |
2070 | rc = assign_eip_near(ctxt, ctxt->src.val); | |
2071 | if (rc != X86EMUL_CONTINUE) | |
2072 | return rc; | |
2073 | ctxt->src.val = old_eip; | |
2074 | rc = em_push(ctxt); | |
4179bb02 | 2075 | return rc; |
8cdbd2c9 LV |
2076 | } |
2077 | ||
e0dac408 | 2078 | static int em_cmpxchg8b(struct x86_emulate_ctxt *ctxt) |
8cdbd2c9 | 2079 | { |
9dac77fa | 2080 | u64 old = ctxt->dst.orig_val64; |
8cdbd2c9 | 2081 | |
aaa05f24 NA |
2082 | if (ctxt->dst.bytes == 16) |
2083 | return X86EMUL_UNHANDLEABLE; | |
2084 | ||
dd856efa AK |
2085 | if (((u32) (old >> 0) != (u32) reg_read(ctxt, VCPU_REGS_RAX)) || |
2086 | ((u32) (old >> 32) != (u32) reg_read(ctxt, VCPU_REGS_RDX))) { | |
2087 | *reg_write(ctxt, VCPU_REGS_RAX) = (u32) (old >> 0); | |
2088 | *reg_write(ctxt, VCPU_REGS_RDX) = (u32) (old >> 32); | |
05f086f8 | 2089 | ctxt->eflags &= ~EFLG_ZF; |
8cdbd2c9 | 2090 | } else { |
dd856efa AK |
2091 | ctxt->dst.val64 = ((u64)reg_read(ctxt, VCPU_REGS_RCX) << 32) | |
2092 | (u32) reg_read(ctxt, VCPU_REGS_RBX); | |
8cdbd2c9 | 2093 | |
05f086f8 | 2094 | ctxt->eflags |= EFLG_ZF; |
8cdbd2c9 | 2095 | } |
1b30eaa8 | 2096 | return X86EMUL_CONTINUE; |
8cdbd2c9 LV |
2097 | } |
2098 | ||
ebda02c2 TY |
2099 | static int em_ret(struct x86_emulate_ctxt *ctxt) |
2100 | { | |
234f3ce4 NA |
2101 | int rc; |
2102 | unsigned long eip; | |
2103 | ||
2104 | rc = emulate_pop(ctxt, &eip, ctxt->op_bytes); | |
2105 | if (rc != X86EMUL_CONTINUE) | |
2106 | return rc; | |
2107 | ||
2108 | return assign_eip_near(ctxt, eip); | |
ebda02c2 TY |
2109 | } |
2110 | ||
e01991e7 | 2111 | static int em_ret_far(struct x86_emulate_ctxt *ctxt) |
a77ab5ea | 2112 | { |
a77ab5ea | 2113 | int rc; |
d1442d85 NA |
2114 | unsigned long eip, cs; |
2115 | u16 old_cs; | |
9e8919ae | 2116 | int cpl = ctxt->ops->cpl(ctxt); |
d1442d85 NA |
2117 | struct desc_struct old_desc, new_desc; |
2118 | const struct x86_emulate_ops *ops = ctxt->ops; | |
2119 | ||
2120 | if (ctxt->mode == X86EMUL_MODE_PROT64) | |
2121 | ops->get_segment(ctxt, &old_cs, &old_desc, NULL, | |
2122 | VCPU_SREG_CS); | |
a77ab5ea | 2123 | |
d1442d85 | 2124 | rc = emulate_pop(ctxt, &eip, ctxt->op_bytes); |
1b30eaa8 | 2125 | if (rc != X86EMUL_CONTINUE) |
a77ab5ea | 2126 | return rc; |
9dac77fa | 2127 | rc = emulate_pop(ctxt, &cs, ctxt->op_bytes); |
1b30eaa8 | 2128 | if (rc != X86EMUL_CONTINUE) |
a77ab5ea | 2129 | return rc; |
9e8919ae NA |
2130 | /* Outer-privilege level return is not implemented */ |
2131 | if (ctxt->mode >= X86EMUL_MODE_PROT16 && (cs & 3) > cpl) | |
2132 | return X86EMUL_UNHANDLEABLE; | |
d1442d85 NA |
2133 | rc = __load_segment_descriptor(ctxt, (u16)cs, VCPU_SREG_CS, 0, false, |
2134 | &new_desc); | |
2135 | if (rc != X86EMUL_CONTINUE) | |
2136 | return rc; | |
d50eaa18 | 2137 | rc = assign_eip_far(ctxt, eip, &new_desc); |
d1442d85 | 2138 | if (rc != X86EMUL_CONTINUE) { |
cd9b8e2c | 2139 | WARN_ON(ctxt->mode != X86EMUL_MODE_PROT64); |
d1442d85 NA |
2140 | ops->set_segment(ctxt, old_cs, &old_desc, 0, VCPU_SREG_CS); |
2141 | } | |
a77ab5ea AK |
2142 | return rc; |
2143 | } | |
2144 | ||
3261107e BR |
2145 | static int em_ret_far_imm(struct x86_emulate_ctxt *ctxt) |
2146 | { | |
2147 | int rc; | |
2148 | ||
2149 | rc = em_ret_far(ctxt); | |
2150 | if (rc != X86EMUL_CONTINUE) | |
2151 | return rc; | |
2152 | rsp_increment(ctxt, ctxt->src.val); | |
2153 | return X86EMUL_CONTINUE; | |
2154 | } | |
2155 | ||
e940b5c2 TY |
2156 | static int em_cmpxchg(struct x86_emulate_ctxt *ctxt) |
2157 | { | |
2158 | /* Save real source value, then compare EAX against destination. */ | |
37c564f2 NA |
2159 | ctxt->dst.orig_val = ctxt->dst.val; |
2160 | ctxt->dst.val = reg_read(ctxt, VCPU_REGS_RAX); | |
e940b5c2 | 2161 | ctxt->src.orig_val = ctxt->src.val; |
37c564f2 | 2162 | ctxt->src.val = ctxt->dst.orig_val; |
158de57f | 2163 | fastop(ctxt, em_cmp); |
e940b5c2 TY |
2164 | |
2165 | if (ctxt->eflags & EFLG_ZF) { | |
2166 | /* Success: write back to memory. */ | |
2167 | ctxt->dst.val = ctxt->src.orig_val; | |
2168 | } else { | |
2169 | /* Failure: write the value we saw to EAX. */ | |
2170 | ctxt->dst.type = OP_REG; | |
dd856efa | 2171 | ctxt->dst.addr.reg = reg_rmw(ctxt, VCPU_REGS_RAX); |
37c564f2 | 2172 | ctxt->dst.val = ctxt->dst.orig_val; |
e940b5c2 TY |
2173 | } |
2174 | return X86EMUL_CONTINUE; | |
2175 | } | |
2176 | ||
d4b4325f | 2177 | static int em_lseg(struct x86_emulate_ctxt *ctxt) |
09b5f4d3 | 2178 | { |
d4b4325f | 2179 | int seg = ctxt->src2.val; |
09b5f4d3 WY |
2180 | unsigned short sel; |
2181 | int rc; | |
2182 | ||
9dac77fa | 2183 | memcpy(&sel, ctxt->src.valptr + ctxt->op_bytes, 2); |
09b5f4d3 | 2184 | |
7b105ca2 | 2185 | rc = load_segment_descriptor(ctxt, sel, seg); |
09b5f4d3 WY |
2186 | if (rc != X86EMUL_CONTINUE) |
2187 | return rc; | |
2188 | ||
9dac77fa | 2189 | ctxt->dst.val = ctxt->src.val; |
09b5f4d3 WY |
2190 | return rc; |
2191 | } | |
2192 | ||
7b105ca2 | 2193 | static void |
e66bb2cc | 2194 | setup_syscalls_segments(struct x86_emulate_ctxt *ctxt, |
7b105ca2 | 2195 | struct desc_struct *cs, struct desc_struct *ss) |
e66bb2cc | 2196 | { |
e66bb2cc | 2197 | cs->l = 0; /* will be adjusted later */ |
79168fd1 | 2198 | set_desc_base(cs, 0); /* flat segment */ |
e66bb2cc | 2199 | cs->g = 1; /* 4kb granularity */ |
79168fd1 | 2200 | set_desc_limit(cs, 0xfffff); /* 4GB limit */ |
e66bb2cc AP |
2201 | cs->type = 0x0b; /* Read, Execute, Accessed */ |
2202 | cs->s = 1; | |
2203 | cs->dpl = 0; /* will be adjusted later */ | |
79168fd1 GN |
2204 | cs->p = 1; |
2205 | cs->d = 1; | |
99245b50 | 2206 | cs->avl = 0; |
e66bb2cc | 2207 | |
79168fd1 GN |
2208 | set_desc_base(ss, 0); /* flat segment */ |
2209 | set_desc_limit(ss, 0xfffff); /* 4GB limit */ | |
e66bb2cc AP |
2210 | ss->g = 1; /* 4kb granularity */ |
2211 | ss->s = 1; | |
2212 | ss->type = 0x03; /* Read/Write, Accessed */ | |
79168fd1 | 2213 | ss->d = 1; /* 32bit stack segment */ |
e66bb2cc | 2214 | ss->dpl = 0; |
79168fd1 | 2215 | ss->p = 1; |
99245b50 GN |
2216 | ss->l = 0; |
2217 | ss->avl = 0; | |
e66bb2cc AP |
2218 | } |
2219 | ||
1a18a69b AK |
2220 | static bool vendor_intel(struct x86_emulate_ctxt *ctxt) |
2221 | { | |
2222 | u32 eax, ebx, ecx, edx; | |
2223 | ||
2224 | eax = ecx = 0; | |
0017f93a AK |
2225 | ctxt->ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx); |
2226 | return ebx == X86EMUL_CPUID_VENDOR_GenuineIntel_ebx | |
1a18a69b AK |
2227 | && ecx == X86EMUL_CPUID_VENDOR_GenuineIntel_ecx |
2228 | && edx == X86EMUL_CPUID_VENDOR_GenuineIntel_edx; | |
2229 | } | |
2230 | ||
c2226fc9 SB |
2231 | static bool em_syscall_is_enabled(struct x86_emulate_ctxt *ctxt) |
2232 | { | |
0225fb50 | 2233 | const struct x86_emulate_ops *ops = ctxt->ops; |
c2226fc9 SB |
2234 | u32 eax, ebx, ecx, edx; |
2235 | ||
2236 | /* | |
2237 | * syscall should always be enabled in longmode - so only become | |
2238 | * vendor specific (cpuid) if other modes are active... | |
2239 | */ | |
2240 | if (ctxt->mode == X86EMUL_MODE_PROT64) | |
2241 | return true; | |
2242 | ||
2243 | eax = 0x00000000; | |
2244 | ecx = 0x00000000; | |
0017f93a AK |
2245 | ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx); |
2246 | /* | |
2247 | * Intel ("GenuineIntel") | |
2248 | * remark: Intel CPUs only support "syscall" in 64bit | |
2249 | * longmode. Also an 64bit guest with a | |
2250 | * 32bit compat-app running will #UD !! While this | |
2251 | * behaviour can be fixed (by emulating) into AMD | |
2252 | * response - CPUs of AMD can't behave like Intel. | |
2253 | */ | |
2254 | if (ebx == X86EMUL_CPUID_VENDOR_GenuineIntel_ebx && | |
2255 | ecx == X86EMUL_CPUID_VENDOR_GenuineIntel_ecx && | |
2256 | edx == X86EMUL_CPUID_VENDOR_GenuineIntel_edx) | |
2257 | return false; | |
2258 | ||
2259 | /* AMD ("AuthenticAMD") */ | |
2260 | if (ebx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ebx && | |
2261 | ecx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ecx && | |
2262 | edx == X86EMUL_CPUID_VENDOR_AuthenticAMD_edx) | |
2263 | return true; | |
2264 | ||
2265 | /* AMD ("AMDisbetter!") */ | |
2266 | if (ebx == X86EMUL_CPUID_VENDOR_AMDisbetterI_ebx && | |
2267 | ecx == X86EMUL_CPUID_VENDOR_AMDisbetterI_ecx && | |
2268 | edx == X86EMUL_CPUID_VENDOR_AMDisbetterI_edx) | |
2269 | return true; | |
c2226fc9 SB |
2270 | |
2271 | /* default: (not Intel, not AMD), apply Intel's stricter rules... */ | |
2272 | return false; | |
2273 | } | |
2274 | ||
e01991e7 | 2275 | static int em_syscall(struct x86_emulate_ctxt *ctxt) |
e66bb2cc | 2276 | { |
0225fb50 | 2277 | const struct x86_emulate_ops *ops = ctxt->ops; |
79168fd1 | 2278 | struct desc_struct cs, ss; |
e66bb2cc | 2279 | u64 msr_data; |
79168fd1 | 2280 | u16 cs_sel, ss_sel; |
c2ad2bb3 | 2281 | u64 efer = 0; |
e66bb2cc AP |
2282 | |
2283 | /* syscall is not available in real mode */ | |
2e901c4c | 2284 | if (ctxt->mode == X86EMUL_MODE_REAL || |
35d3d4a1 AK |
2285 | ctxt->mode == X86EMUL_MODE_VM86) |
2286 | return emulate_ud(ctxt); | |
e66bb2cc | 2287 | |
c2226fc9 SB |
2288 | if (!(em_syscall_is_enabled(ctxt))) |
2289 | return emulate_ud(ctxt); | |
2290 | ||
c2ad2bb3 | 2291 | ops->get_msr(ctxt, MSR_EFER, &efer); |
7b105ca2 | 2292 | setup_syscalls_segments(ctxt, &cs, &ss); |
e66bb2cc | 2293 | |
c2226fc9 SB |
2294 | if (!(efer & EFER_SCE)) |
2295 | return emulate_ud(ctxt); | |
2296 | ||
717746e3 | 2297 | ops->get_msr(ctxt, MSR_STAR, &msr_data); |
e66bb2cc | 2298 | msr_data >>= 32; |
79168fd1 GN |
2299 | cs_sel = (u16)(msr_data & 0xfffc); |
2300 | ss_sel = (u16)(msr_data + 8); | |
e66bb2cc | 2301 | |
c2ad2bb3 | 2302 | if (efer & EFER_LMA) { |
79168fd1 | 2303 | cs.d = 0; |
e66bb2cc AP |
2304 | cs.l = 1; |
2305 | } | |
1aa36616 AK |
2306 | ops->set_segment(ctxt, cs_sel, &cs, 0, VCPU_SREG_CS); |
2307 | ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS); | |
e66bb2cc | 2308 | |
dd856efa | 2309 | *reg_write(ctxt, VCPU_REGS_RCX) = ctxt->_eip; |
c2ad2bb3 | 2310 | if (efer & EFER_LMA) { |
e66bb2cc | 2311 | #ifdef CONFIG_X86_64 |
6c6cb69b | 2312 | *reg_write(ctxt, VCPU_REGS_R11) = ctxt->eflags; |
e66bb2cc | 2313 | |
717746e3 | 2314 | ops->get_msr(ctxt, |
3fb1b5db GN |
2315 | ctxt->mode == X86EMUL_MODE_PROT64 ? |
2316 | MSR_LSTAR : MSR_CSTAR, &msr_data); | |
9dac77fa | 2317 | ctxt->_eip = msr_data; |
e66bb2cc | 2318 | |
717746e3 | 2319 | ops->get_msr(ctxt, MSR_SYSCALL_MASK, &msr_data); |
6c6cb69b | 2320 | ctxt->eflags &= ~msr_data; |
807c1425 | 2321 | ctxt->eflags |= EFLG_RESERVED_ONE_MASK; |
e66bb2cc AP |
2322 | #endif |
2323 | } else { | |
2324 | /* legacy mode */ | |
717746e3 | 2325 | ops->get_msr(ctxt, MSR_STAR, &msr_data); |
9dac77fa | 2326 | ctxt->_eip = (u32)msr_data; |
e66bb2cc | 2327 | |
6c6cb69b | 2328 | ctxt->eflags &= ~(EFLG_VM | EFLG_IF); |
e66bb2cc AP |
2329 | } |
2330 | ||
e54cfa97 | 2331 | return X86EMUL_CONTINUE; |
e66bb2cc AP |
2332 | } |
2333 | ||
e01991e7 | 2334 | static int em_sysenter(struct x86_emulate_ctxt *ctxt) |
8c604352 | 2335 | { |
0225fb50 | 2336 | const struct x86_emulate_ops *ops = ctxt->ops; |
79168fd1 | 2337 | struct desc_struct cs, ss; |
8c604352 | 2338 | u64 msr_data; |
79168fd1 | 2339 | u16 cs_sel, ss_sel; |
c2ad2bb3 | 2340 | u64 efer = 0; |
8c604352 | 2341 | |
7b105ca2 | 2342 | ops->get_msr(ctxt, MSR_EFER, &efer); |
a0044755 | 2343 | /* inject #GP if in real mode */ |
35d3d4a1 AK |
2344 | if (ctxt->mode == X86EMUL_MODE_REAL) |
2345 | return emulate_gp(ctxt, 0); | |
8c604352 | 2346 | |
1a18a69b AK |
2347 | /* |
2348 | * Not recognized on AMD in compat mode (but is recognized in legacy | |
2349 | * mode). | |
2350 | */ | |
2351 | if ((ctxt->mode == X86EMUL_MODE_PROT32) && (efer & EFER_LMA) | |
2352 | && !vendor_intel(ctxt)) | |
2353 | return emulate_ud(ctxt); | |
2354 | ||
b2c9d43e | 2355 | /* sysenter/sysexit have not been tested in 64bit mode. */ |
35d3d4a1 | 2356 | if (ctxt->mode == X86EMUL_MODE_PROT64) |
b2c9d43e | 2357 | return X86EMUL_UNHANDLEABLE; |
8c604352 | 2358 | |
7b105ca2 | 2359 | setup_syscalls_segments(ctxt, &cs, &ss); |
8c604352 | 2360 | |
717746e3 | 2361 | ops->get_msr(ctxt, MSR_IA32_SYSENTER_CS, &msr_data); |
8c604352 AP |
2362 | switch (ctxt->mode) { |
2363 | case X86EMUL_MODE_PROT32: | |
35d3d4a1 AK |
2364 | if ((msr_data & 0xfffc) == 0x0) |
2365 | return emulate_gp(ctxt, 0); | |
8c604352 AP |
2366 | break; |
2367 | case X86EMUL_MODE_PROT64: | |
35d3d4a1 AK |
2368 | if (msr_data == 0x0) |
2369 | return emulate_gp(ctxt, 0); | |
8c604352 | 2370 | break; |
9d1b39a9 GN |
2371 | default: |
2372 | break; | |
8c604352 AP |
2373 | } |
2374 | ||
6c6cb69b | 2375 | ctxt->eflags &= ~(EFLG_VM | EFLG_IF); |
79168fd1 GN |
2376 | cs_sel = (u16)msr_data; |
2377 | cs_sel &= ~SELECTOR_RPL_MASK; | |
2378 | ss_sel = cs_sel + 8; | |
2379 | ss_sel &= ~SELECTOR_RPL_MASK; | |
c2ad2bb3 | 2380 | if (ctxt->mode == X86EMUL_MODE_PROT64 || (efer & EFER_LMA)) { |
79168fd1 | 2381 | cs.d = 0; |
8c604352 AP |
2382 | cs.l = 1; |
2383 | } | |
2384 | ||
1aa36616 AK |
2385 | ops->set_segment(ctxt, cs_sel, &cs, 0, VCPU_SREG_CS); |
2386 | ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS); | |
8c604352 | 2387 | |
717746e3 | 2388 | ops->get_msr(ctxt, MSR_IA32_SYSENTER_EIP, &msr_data); |
9dac77fa | 2389 | ctxt->_eip = msr_data; |
8c604352 | 2390 | |
717746e3 | 2391 | ops->get_msr(ctxt, MSR_IA32_SYSENTER_ESP, &msr_data); |
dd856efa | 2392 | *reg_write(ctxt, VCPU_REGS_RSP) = msr_data; |
8c604352 | 2393 | |
e54cfa97 | 2394 | return X86EMUL_CONTINUE; |
8c604352 AP |
2395 | } |
2396 | ||
e01991e7 | 2397 | static int em_sysexit(struct x86_emulate_ctxt *ctxt) |
4668f050 | 2398 | { |
0225fb50 | 2399 | const struct x86_emulate_ops *ops = ctxt->ops; |
79168fd1 | 2400 | struct desc_struct cs, ss; |
234f3ce4 | 2401 | u64 msr_data, rcx, rdx; |
4668f050 | 2402 | int usermode; |
1249b96e | 2403 | u16 cs_sel = 0, ss_sel = 0; |
4668f050 | 2404 | |
a0044755 GN |
2405 | /* inject #GP if in real mode or Virtual 8086 mode */ |
2406 | if (ctxt->mode == X86EMUL_MODE_REAL || | |
35d3d4a1 AK |
2407 | ctxt->mode == X86EMUL_MODE_VM86) |
2408 | return emulate_gp(ctxt, 0); | |
4668f050 | 2409 | |
7b105ca2 | 2410 | setup_syscalls_segments(ctxt, &cs, &ss); |
4668f050 | 2411 | |
9dac77fa | 2412 | if ((ctxt->rex_prefix & 0x8) != 0x0) |
4668f050 AP |
2413 | usermode = X86EMUL_MODE_PROT64; |
2414 | else | |
2415 | usermode = X86EMUL_MODE_PROT32; | |
2416 | ||
234f3ce4 NA |
2417 | rcx = reg_read(ctxt, VCPU_REGS_RCX); |
2418 | rdx = reg_read(ctxt, VCPU_REGS_RDX); | |
2419 | ||
4668f050 AP |
2420 | cs.dpl = 3; |
2421 | ss.dpl = 3; | |
717746e3 | 2422 | ops->get_msr(ctxt, MSR_IA32_SYSENTER_CS, &msr_data); |
4668f050 AP |
2423 | switch (usermode) { |
2424 | case X86EMUL_MODE_PROT32: | |
79168fd1 | 2425 | cs_sel = (u16)(msr_data + 16); |
35d3d4a1 AK |
2426 | if ((msr_data & 0xfffc) == 0x0) |
2427 | return emulate_gp(ctxt, 0); | |
79168fd1 | 2428 | ss_sel = (u16)(msr_data + 24); |
bf0b682c NA |
2429 | rcx = (u32)rcx; |
2430 | rdx = (u32)rdx; | |
4668f050 AP |
2431 | break; |
2432 | case X86EMUL_MODE_PROT64: | |
79168fd1 | 2433 | cs_sel = (u16)(msr_data + 32); |
35d3d4a1 AK |
2434 | if (msr_data == 0x0) |
2435 | return emulate_gp(ctxt, 0); | |
79168fd1 GN |
2436 | ss_sel = cs_sel + 8; |
2437 | cs.d = 0; | |
4668f050 | 2438 | cs.l = 1; |
234f3ce4 NA |
2439 | if (is_noncanonical_address(rcx) || |
2440 | is_noncanonical_address(rdx)) | |
2441 | return emulate_gp(ctxt, 0); | |
4668f050 AP |
2442 | break; |
2443 | } | |
79168fd1 GN |
2444 | cs_sel |= SELECTOR_RPL_MASK; |
2445 | ss_sel |= SELECTOR_RPL_MASK; | |
4668f050 | 2446 | |
1aa36616 AK |
2447 | ops->set_segment(ctxt, cs_sel, &cs, 0, VCPU_SREG_CS); |
2448 | ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS); | |
4668f050 | 2449 | |
234f3ce4 NA |
2450 | ctxt->_eip = rdx; |
2451 | *reg_write(ctxt, VCPU_REGS_RSP) = rcx; | |
4668f050 | 2452 | |
e54cfa97 | 2453 | return X86EMUL_CONTINUE; |
4668f050 AP |
2454 | } |
2455 | ||
7b105ca2 | 2456 | static bool emulator_bad_iopl(struct x86_emulate_ctxt *ctxt) |
f850e2e6 GN |
2457 | { |
2458 | int iopl; | |
2459 | if (ctxt->mode == X86EMUL_MODE_REAL) | |
2460 | return false; | |
2461 | if (ctxt->mode == X86EMUL_MODE_VM86) | |
2462 | return true; | |
2463 | iopl = (ctxt->eflags & X86_EFLAGS_IOPL) >> IOPL_SHIFT; | |
7b105ca2 | 2464 | return ctxt->ops->cpl(ctxt) > iopl; |
f850e2e6 GN |
2465 | } |
2466 | ||
2467 | static bool emulator_io_port_access_allowed(struct x86_emulate_ctxt *ctxt, | |
f850e2e6 GN |
2468 | u16 port, u16 len) |
2469 | { | |
0225fb50 | 2470 | const struct x86_emulate_ops *ops = ctxt->ops; |
79168fd1 | 2471 | struct desc_struct tr_seg; |
5601d05b | 2472 | u32 base3; |
f850e2e6 | 2473 | int r; |
1aa36616 | 2474 | u16 tr, io_bitmap_ptr, perm, bit_idx = port & 0x7; |
f850e2e6 | 2475 | unsigned mask = (1 << len) - 1; |
5601d05b | 2476 | unsigned long base; |
f850e2e6 | 2477 | |
1aa36616 | 2478 | ops->get_segment(ctxt, &tr, &tr_seg, &base3, VCPU_SREG_TR); |
79168fd1 | 2479 | if (!tr_seg.p) |
f850e2e6 | 2480 | return false; |
79168fd1 | 2481 | if (desc_limit_scaled(&tr_seg) < 103) |
f850e2e6 | 2482 | return false; |
5601d05b GN |
2483 | base = get_desc_base(&tr_seg); |
2484 | #ifdef CONFIG_X86_64 | |
2485 | base |= ((u64)base3) << 32; | |
2486 | #endif | |
0f65dd70 | 2487 | r = ops->read_std(ctxt, base + 102, &io_bitmap_ptr, 2, NULL); |
f850e2e6 GN |
2488 | if (r != X86EMUL_CONTINUE) |
2489 | return false; | |
79168fd1 | 2490 | if (io_bitmap_ptr + port/8 > desc_limit_scaled(&tr_seg)) |
f850e2e6 | 2491 | return false; |
0f65dd70 | 2492 | r = ops->read_std(ctxt, base + io_bitmap_ptr + port/8, &perm, 2, NULL); |
f850e2e6 GN |
2493 | if (r != X86EMUL_CONTINUE) |
2494 | return false; | |
2495 | if ((perm >> bit_idx) & mask) | |
2496 | return false; | |
2497 | return true; | |
2498 | } | |
2499 | ||
2500 | static bool emulator_io_permited(struct x86_emulate_ctxt *ctxt, | |
f850e2e6 GN |
2501 | u16 port, u16 len) |
2502 | { | |
4fc40f07 GN |
2503 | if (ctxt->perm_ok) |
2504 | return true; | |
2505 | ||
7b105ca2 TY |
2506 | if (emulator_bad_iopl(ctxt)) |
2507 | if (!emulator_io_port_access_allowed(ctxt, port, len)) | |
f850e2e6 | 2508 | return false; |
4fc40f07 GN |
2509 | |
2510 | ctxt->perm_ok = true; | |
2511 | ||
f850e2e6 GN |
2512 | return true; |
2513 | } | |
2514 | ||
38ba30ba | 2515 | static void save_state_to_tss16(struct x86_emulate_ctxt *ctxt, |
38ba30ba GN |
2516 | struct tss_segment_16 *tss) |
2517 | { | |
9dac77fa | 2518 | tss->ip = ctxt->_eip; |
38ba30ba | 2519 | tss->flag = ctxt->eflags; |
dd856efa AK |
2520 | tss->ax = reg_read(ctxt, VCPU_REGS_RAX); |
2521 | tss->cx = reg_read(ctxt, VCPU_REGS_RCX); | |
2522 | tss->dx = reg_read(ctxt, VCPU_REGS_RDX); | |
2523 | tss->bx = reg_read(ctxt, VCPU_REGS_RBX); | |
2524 | tss->sp = reg_read(ctxt, VCPU_REGS_RSP); | |
2525 | tss->bp = reg_read(ctxt, VCPU_REGS_RBP); | |
2526 | tss->si = reg_read(ctxt, VCPU_REGS_RSI); | |
2527 | tss->di = reg_read(ctxt, VCPU_REGS_RDI); | |
38ba30ba | 2528 | |
1aa36616 AK |
2529 | tss->es = get_segment_selector(ctxt, VCPU_SREG_ES); |
2530 | tss->cs = get_segment_selector(ctxt, VCPU_SREG_CS); | |
2531 | tss->ss = get_segment_selector(ctxt, VCPU_SREG_SS); | |
2532 | tss->ds = get_segment_selector(ctxt, VCPU_SREG_DS); | |
2533 | tss->ldt = get_segment_selector(ctxt, VCPU_SREG_LDTR); | |
38ba30ba GN |
2534 | } |
2535 | ||
2536 | static int load_state_from_tss16(struct x86_emulate_ctxt *ctxt, | |
38ba30ba GN |
2537 | struct tss_segment_16 *tss) |
2538 | { | |
38ba30ba | 2539 | int ret; |
2356aaeb | 2540 | u8 cpl; |
38ba30ba | 2541 | |
9dac77fa | 2542 | ctxt->_eip = tss->ip; |
38ba30ba | 2543 | ctxt->eflags = tss->flag | 2; |
dd856efa AK |
2544 | *reg_write(ctxt, VCPU_REGS_RAX) = tss->ax; |
2545 | *reg_write(ctxt, VCPU_REGS_RCX) = tss->cx; | |
2546 | *reg_write(ctxt, VCPU_REGS_RDX) = tss->dx; | |
2547 | *reg_write(ctxt, VCPU_REGS_RBX) = tss->bx; | |
2548 | *reg_write(ctxt, VCPU_REGS_RSP) = tss->sp; | |
2549 | *reg_write(ctxt, VCPU_REGS_RBP) = tss->bp; | |
2550 | *reg_write(ctxt, VCPU_REGS_RSI) = tss->si; | |
2551 | *reg_write(ctxt, VCPU_REGS_RDI) = tss->di; | |
38ba30ba GN |
2552 | |
2553 | /* | |
2554 | * SDM says that segment selectors are loaded before segment | |
2555 | * descriptors | |
2556 | */ | |
1aa36616 AK |
2557 | set_segment_selector(ctxt, tss->ldt, VCPU_SREG_LDTR); |
2558 | set_segment_selector(ctxt, tss->es, VCPU_SREG_ES); | |
2559 | set_segment_selector(ctxt, tss->cs, VCPU_SREG_CS); | |
2560 | set_segment_selector(ctxt, tss->ss, VCPU_SREG_SS); | |
2561 | set_segment_selector(ctxt, tss->ds, VCPU_SREG_DS); | |
38ba30ba | 2562 | |
2356aaeb PB |
2563 | cpl = tss->cs & 3; |
2564 | ||
38ba30ba | 2565 | /* |
fc058680 | 2566 | * Now load segment descriptors. If fault happens at this stage |
38ba30ba GN |
2567 | * it is handled in a context of new task |
2568 | */ | |
d1442d85 NA |
2569 | ret = __load_segment_descriptor(ctxt, tss->ldt, VCPU_SREG_LDTR, cpl, |
2570 | true, NULL); | |
38ba30ba GN |
2571 | if (ret != X86EMUL_CONTINUE) |
2572 | return ret; | |
d1442d85 NA |
2573 | ret = __load_segment_descriptor(ctxt, tss->es, VCPU_SREG_ES, cpl, |
2574 | true, NULL); | |
38ba30ba GN |
2575 | if (ret != X86EMUL_CONTINUE) |
2576 | return ret; | |
d1442d85 NA |
2577 | ret = __load_segment_descriptor(ctxt, tss->cs, VCPU_SREG_CS, cpl, |
2578 | true, NULL); | |
38ba30ba GN |
2579 | if (ret != X86EMUL_CONTINUE) |
2580 | return ret; | |
d1442d85 NA |
2581 | ret = __load_segment_descriptor(ctxt, tss->ss, VCPU_SREG_SS, cpl, |
2582 | true, NULL); | |
38ba30ba GN |
2583 | if (ret != X86EMUL_CONTINUE) |
2584 | return ret; | |
d1442d85 NA |
2585 | ret = __load_segment_descriptor(ctxt, tss->ds, VCPU_SREG_DS, cpl, |
2586 | true, NULL); | |
38ba30ba GN |
2587 | if (ret != X86EMUL_CONTINUE) |
2588 | return ret; | |
2589 | ||
2590 | return X86EMUL_CONTINUE; | |
2591 | } | |
2592 | ||
2593 | static int task_switch_16(struct x86_emulate_ctxt *ctxt, | |
38ba30ba GN |
2594 | u16 tss_selector, u16 old_tss_sel, |
2595 | ulong old_tss_base, struct desc_struct *new_desc) | |
2596 | { | |
0225fb50 | 2597 | const struct x86_emulate_ops *ops = ctxt->ops; |
38ba30ba GN |
2598 | struct tss_segment_16 tss_seg; |
2599 | int ret; | |
bcc55cba | 2600 | u32 new_tss_base = get_desc_base(new_desc); |
38ba30ba | 2601 | |
0f65dd70 | 2602 | ret = ops->read_std(ctxt, old_tss_base, &tss_seg, sizeof tss_seg, |
bcc55cba | 2603 | &ctxt->exception); |
db297e3d | 2604 | if (ret != X86EMUL_CONTINUE) |
38ba30ba | 2605 | return ret; |
38ba30ba | 2606 | |
7b105ca2 | 2607 | save_state_to_tss16(ctxt, &tss_seg); |
38ba30ba | 2608 | |
0f65dd70 | 2609 | ret = ops->write_std(ctxt, old_tss_base, &tss_seg, sizeof tss_seg, |
bcc55cba | 2610 | &ctxt->exception); |
db297e3d | 2611 | if (ret != X86EMUL_CONTINUE) |
38ba30ba | 2612 | return ret; |
38ba30ba | 2613 | |
0f65dd70 | 2614 | ret = ops->read_std(ctxt, new_tss_base, &tss_seg, sizeof tss_seg, |
bcc55cba | 2615 | &ctxt->exception); |
db297e3d | 2616 | if (ret != X86EMUL_CONTINUE) |
38ba30ba | 2617 | return ret; |
38ba30ba GN |
2618 | |
2619 | if (old_tss_sel != 0xffff) { | |
2620 | tss_seg.prev_task_link = old_tss_sel; | |
2621 | ||
0f65dd70 | 2622 | ret = ops->write_std(ctxt, new_tss_base, |
38ba30ba GN |
2623 | &tss_seg.prev_task_link, |
2624 | sizeof tss_seg.prev_task_link, | |
0f65dd70 | 2625 | &ctxt->exception); |
db297e3d | 2626 | if (ret != X86EMUL_CONTINUE) |
38ba30ba | 2627 | return ret; |
38ba30ba GN |
2628 | } |
2629 | ||
7b105ca2 | 2630 | return load_state_from_tss16(ctxt, &tss_seg); |
38ba30ba GN |
2631 | } |
2632 | ||
2633 | static void save_state_to_tss32(struct x86_emulate_ctxt *ctxt, | |
38ba30ba GN |
2634 | struct tss_segment_32 *tss) |
2635 | { | |
5c7411e2 | 2636 | /* CR3 and ldt selector are not saved intentionally */ |
9dac77fa | 2637 | tss->eip = ctxt->_eip; |
38ba30ba | 2638 | tss->eflags = ctxt->eflags; |
dd856efa AK |
2639 | tss->eax = reg_read(ctxt, VCPU_REGS_RAX); |
2640 | tss->ecx = reg_read(ctxt, VCPU_REGS_RCX); | |
2641 | tss->edx = reg_read(ctxt, VCPU_REGS_RDX); | |
2642 | tss->ebx = reg_read(ctxt, VCPU_REGS_RBX); | |
2643 | tss->esp = reg_read(ctxt, VCPU_REGS_RSP); | |
2644 | tss->ebp = reg_read(ctxt, VCPU_REGS_RBP); | |
2645 | tss->esi = reg_read(ctxt, VCPU_REGS_RSI); | |
2646 | tss->edi = reg_read(ctxt, VCPU_REGS_RDI); | |
38ba30ba | 2647 | |
1aa36616 AK |
2648 | tss->es = get_segment_selector(ctxt, VCPU_SREG_ES); |
2649 | tss->cs = get_segment_selector(ctxt, VCPU_SREG_CS); | |
2650 | tss->ss = get_segment_selector(ctxt, VCPU_SREG_SS); | |
2651 | tss->ds = get_segment_selector(ctxt, VCPU_SREG_DS); | |
2652 | tss->fs = get_segment_selector(ctxt, VCPU_SREG_FS); | |
2653 | tss->gs = get_segment_selector(ctxt, VCPU_SREG_GS); | |
38ba30ba GN |
2654 | } |
2655 | ||
2656 | static int load_state_from_tss32(struct x86_emulate_ctxt *ctxt, | |
38ba30ba GN |
2657 | struct tss_segment_32 *tss) |
2658 | { | |
38ba30ba | 2659 | int ret; |
2356aaeb | 2660 | u8 cpl; |
38ba30ba | 2661 | |
7b105ca2 | 2662 | if (ctxt->ops->set_cr(ctxt, 3, tss->cr3)) |
35d3d4a1 | 2663 | return emulate_gp(ctxt, 0); |
9dac77fa | 2664 | ctxt->_eip = tss->eip; |
38ba30ba | 2665 | ctxt->eflags = tss->eflags | 2; |
4cee4798 KW |
2666 | |
2667 | /* General purpose registers */ | |
dd856efa AK |
2668 | *reg_write(ctxt, VCPU_REGS_RAX) = tss->eax; |
2669 | *reg_write(ctxt, VCPU_REGS_RCX) = tss->ecx; | |
2670 | *reg_write(ctxt, VCPU_REGS_RDX) = tss->edx; | |
2671 | *reg_write(ctxt, VCPU_REGS_RBX) = tss->ebx; | |
2672 | *reg_write(ctxt, VCPU_REGS_RSP) = tss->esp; | |
2673 | *reg_write(ctxt, VCPU_REGS_RBP) = tss->ebp; | |
2674 | *reg_write(ctxt, VCPU_REGS_RSI) = tss->esi; | |
2675 | *reg_write(ctxt, VCPU_REGS_RDI) = tss->edi; | |
38ba30ba GN |
2676 | |
2677 | /* | |
2678 | * SDM says that segment selectors are loaded before segment | |
2356aaeb PB |
2679 | * descriptors. This is important because CPL checks will |
2680 | * use CS.RPL. | |
38ba30ba | 2681 | */ |
1aa36616 AK |
2682 | set_segment_selector(ctxt, tss->ldt_selector, VCPU_SREG_LDTR); |
2683 | set_segment_selector(ctxt, tss->es, VCPU_SREG_ES); | |
2684 | set_segment_selector(ctxt, tss->cs, VCPU_SREG_CS); | |
2685 | set_segment_selector(ctxt, tss->ss, VCPU_SREG_SS); | |
2686 | set_segment_selector(ctxt, tss->ds, VCPU_SREG_DS); | |
2687 | set_segment_selector(ctxt, tss->fs, VCPU_SREG_FS); | |
2688 | set_segment_selector(ctxt, tss->gs, VCPU_SREG_GS); | |
38ba30ba | 2689 | |
4cee4798 KW |
2690 | /* |
2691 | * If we're switching between Protected Mode and VM86, we need to make | |
2692 | * sure to update the mode before loading the segment descriptors so | |
2693 | * that the selectors are interpreted correctly. | |
4cee4798 | 2694 | */ |
2356aaeb | 2695 | if (ctxt->eflags & X86_EFLAGS_VM) { |
4cee4798 | 2696 | ctxt->mode = X86EMUL_MODE_VM86; |
2356aaeb PB |
2697 | cpl = 3; |
2698 | } else { | |
4cee4798 | 2699 | ctxt->mode = X86EMUL_MODE_PROT32; |
2356aaeb PB |
2700 | cpl = tss->cs & 3; |
2701 | } | |
4cee4798 | 2702 | |
38ba30ba GN |
2703 | /* |
2704 | * Now load segment descriptors. If fault happenes at this stage | |
2705 | * it is handled in a context of new task | |
2706 | */ | |
d1442d85 NA |
2707 | ret = __load_segment_descriptor(ctxt, tss->ldt_selector, VCPU_SREG_LDTR, |
2708 | cpl, true, NULL); | |
38ba30ba GN |
2709 | if (ret != X86EMUL_CONTINUE) |
2710 | return ret; | |
d1442d85 NA |
2711 | ret = __load_segment_descriptor(ctxt, tss->es, VCPU_SREG_ES, cpl, |
2712 | true, NULL); | |
38ba30ba GN |
2713 | if (ret != X86EMUL_CONTINUE) |
2714 | return ret; | |
d1442d85 NA |
2715 | ret = __load_segment_descriptor(ctxt, tss->cs, VCPU_SREG_CS, cpl, |
2716 | true, NULL); | |
38ba30ba GN |
2717 | if (ret != X86EMUL_CONTINUE) |
2718 | return ret; | |
d1442d85 NA |
2719 | ret = __load_segment_descriptor(ctxt, tss->ss, VCPU_SREG_SS, cpl, |
2720 | true, NULL); | |
38ba30ba GN |
2721 | if (ret != X86EMUL_CONTINUE) |
2722 | return ret; | |
d1442d85 NA |
2723 | ret = __load_segment_descriptor(ctxt, tss->ds, VCPU_SREG_DS, cpl, |
2724 | true, NULL); | |
38ba30ba GN |
2725 | if (ret != X86EMUL_CONTINUE) |
2726 | return ret; | |
d1442d85 NA |
2727 | ret = __load_segment_descriptor(ctxt, tss->fs, VCPU_SREG_FS, cpl, |
2728 | true, NULL); | |
38ba30ba GN |
2729 | if (ret != X86EMUL_CONTINUE) |
2730 | return ret; | |
d1442d85 NA |
2731 | ret = __load_segment_descriptor(ctxt, tss->gs, VCPU_SREG_GS, cpl, |
2732 | true, NULL); | |
38ba30ba GN |
2733 | if (ret != X86EMUL_CONTINUE) |
2734 | return ret; | |
2735 | ||
2736 | return X86EMUL_CONTINUE; | |
2737 | } | |
2738 | ||
2739 | static int task_switch_32(struct x86_emulate_ctxt *ctxt, | |
38ba30ba GN |
2740 | u16 tss_selector, u16 old_tss_sel, |
2741 | ulong old_tss_base, struct desc_struct *new_desc) | |
2742 | { | |
0225fb50 | 2743 | const struct x86_emulate_ops *ops = ctxt->ops; |
38ba30ba GN |
2744 | struct tss_segment_32 tss_seg; |
2745 | int ret; | |
bcc55cba | 2746 | u32 new_tss_base = get_desc_base(new_desc); |
5c7411e2 NA |
2747 | u32 eip_offset = offsetof(struct tss_segment_32, eip); |
2748 | u32 ldt_sel_offset = offsetof(struct tss_segment_32, ldt_selector); | |
38ba30ba | 2749 | |
0f65dd70 | 2750 | ret = ops->read_std(ctxt, old_tss_base, &tss_seg, sizeof tss_seg, |
bcc55cba | 2751 | &ctxt->exception); |
db297e3d | 2752 | if (ret != X86EMUL_CONTINUE) |
38ba30ba | 2753 | /* FIXME: need to provide precise fault address */ |
38ba30ba | 2754 | return ret; |
38ba30ba | 2755 | |
7b105ca2 | 2756 | save_state_to_tss32(ctxt, &tss_seg); |
38ba30ba | 2757 | |
5c7411e2 NA |
2758 | /* Only GP registers and segment selectors are saved */ |
2759 | ret = ops->write_std(ctxt, old_tss_base + eip_offset, &tss_seg.eip, | |
2760 | ldt_sel_offset - eip_offset, &ctxt->exception); | |
db297e3d | 2761 | if (ret != X86EMUL_CONTINUE) |
38ba30ba | 2762 | /* FIXME: need to provide precise fault address */ |
38ba30ba | 2763 | return ret; |
38ba30ba | 2764 | |
0f65dd70 | 2765 | ret = ops->read_std(ctxt, new_tss_base, &tss_seg, sizeof tss_seg, |
bcc55cba | 2766 | &ctxt->exception); |
db297e3d | 2767 | if (ret != X86EMUL_CONTINUE) |
38ba30ba | 2768 | /* FIXME: need to provide precise fault address */ |
38ba30ba | 2769 | return ret; |
38ba30ba GN |
2770 | |
2771 | if (old_tss_sel != 0xffff) { | |
2772 | tss_seg.prev_task_link = old_tss_sel; | |
2773 | ||
0f65dd70 | 2774 | ret = ops->write_std(ctxt, new_tss_base, |
38ba30ba GN |
2775 | &tss_seg.prev_task_link, |
2776 | sizeof tss_seg.prev_task_link, | |
0f65dd70 | 2777 | &ctxt->exception); |
db297e3d | 2778 | if (ret != X86EMUL_CONTINUE) |
38ba30ba | 2779 | /* FIXME: need to provide precise fault address */ |
38ba30ba | 2780 | return ret; |
38ba30ba GN |
2781 | } |
2782 | ||
7b105ca2 | 2783 | return load_state_from_tss32(ctxt, &tss_seg); |
38ba30ba GN |
2784 | } |
2785 | ||
2786 | static int emulator_do_task_switch(struct x86_emulate_ctxt *ctxt, | |
7f3d35fd | 2787 | u16 tss_selector, int idt_index, int reason, |
e269fb21 | 2788 | bool has_error_code, u32 error_code) |
38ba30ba | 2789 | { |
0225fb50 | 2790 | const struct x86_emulate_ops *ops = ctxt->ops; |
38ba30ba GN |
2791 | struct desc_struct curr_tss_desc, next_tss_desc; |
2792 | int ret; | |
1aa36616 | 2793 | u16 old_tss_sel = get_segment_selector(ctxt, VCPU_SREG_TR); |
38ba30ba | 2794 | ulong old_tss_base = |
4bff1e86 | 2795 | ops->get_cached_segment_base(ctxt, VCPU_SREG_TR); |
ceffb459 | 2796 | u32 desc_limit; |
e919464b | 2797 | ulong desc_addr; |
38ba30ba GN |
2798 | |
2799 | /* FIXME: old_tss_base == ~0 ? */ | |
2800 | ||
e919464b | 2801 | ret = read_segment_descriptor(ctxt, tss_selector, &next_tss_desc, &desc_addr); |
38ba30ba GN |
2802 | if (ret != X86EMUL_CONTINUE) |
2803 | return ret; | |
e919464b | 2804 | ret = read_segment_descriptor(ctxt, old_tss_sel, &curr_tss_desc, &desc_addr); |
38ba30ba GN |
2805 | if (ret != X86EMUL_CONTINUE) |
2806 | return ret; | |
2807 | ||
2808 | /* FIXME: check that next_tss_desc is tss */ | |
2809 | ||
7f3d35fd KW |
2810 | /* |
2811 | * Check privileges. The three cases are task switch caused by... | |
2812 | * | |
2813 | * 1. jmp/call/int to task gate: Check against DPL of the task gate | |
2814 | * 2. Exception/IRQ/iret: No check is performed | |
2c2ca2d1 NA |
2815 | * 3. jmp/call to TSS/task-gate: No check is performed since the |
2816 | * hardware checks it before exiting. | |
7f3d35fd KW |
2817 | */ |
2818 | if (reason == TASK_SWITCH_GATE) { | |
2819 | if (idt_index != -1) { | |
2820 | /* Software interrupts */ | |
2821 | struct desc_struct task_gate_desc; | |
2822 | int dpl; | |
2823 | ||
2824 | ret = read_interrupt_descriptor(ctxt, idt_index, | |
2825 | &task_gate_desc); | |
2826 | if (ret != X86EMUL_CONTINUE) | |
2827 | return ret; | |
2828 | ||
2829 | dpl = task_gate_desc.dpl; | |
2830 | if ((tss_selector & 3) > dpl || ops->cpl(ctxt) > dpl) | |
2831 | return emulate_gp(ctxt, (idt_index << 3) | 0x2); | |
2832 | } | |
38ba30ba GN |
2833 | } |
2834 | ||
ceffb459 GN |
2835 | desc_limit = desc_limit_scaled(&next_tss_desc); |
2836 | if (!next_tss_desc.p || | |
2837 | ((desc_limit < 0x67 && (next_tss_desc.type & 8)) || | |
2838 | desc_limit < 0x2b)) { | |
592f0858 | 2839 | return emulate_ts(ctxt, tss_selector & 0xfffc); |
38ba30ba GN |
2840 | } |
2841 | ||
2842 | if (reason == TASK_SWITCH_IRET || reason == TASK_SWITCH_JMP) { | |
2843 | curr_tss_desc.type &= ~(1 << 1); /* clear busy flag */ | |
7b105ca2 | 2844 | write_segment_descriptor(ctxt, old_tss_sel, &curr_tss_desc); |
38ba30ba GN |
2845 | } |
2846 | ||
2847 | if (reason == TASK_SWITCH_IRET) | |
2848 | ctxt->eflags = ctxt->eflags & ~X86_EFLAGS_NT; | |
2849 | ||
2850 | /* set back link to prev task only if NT bit is set in eflags | |
fc058680 | 2851 | note that old_tss_sel is not used after this point */ |
38ba30ba GN |
2852 | if (reason != TASK_SWITCH_CALL && reason != TASK_SWITCH_GATE) |
2853 | old_tss_sel = 0xffff; | |
2854 | ||
2855 | if (next_tss_desc.type & 8) | |
7b105ca2 | 2856 | ret = task_switch_32(ctxt, tss_selector, old_tss_sel, |
38ba30ba GN |
2857 | old_tss_base, &next_tss_desc); |
2858 | else | |
7b105ca2 | 2859 | ret = task_switch_16(ctxt, tss_selector, old_tss_sel, |
38ba30ba | 2860 | old_tss_base, &next_tss_desc); |
0760d448 JK |
2861 | if (ret != X86EMUL_CONTINUE) |
2862 | return ret; | |
38ba30ba GN |
2863 | |
2864 | if (reason == TASK_SWITCH_CALL || reason == TASK_SWITCH_GATE) | |
2865 | ctxt->eflags = ctxt->eflags | X86_EFLAGS_NT; | |
2866 | ||
2867 | if (reason != TASK_SWITCH_IRET) { | |
2868 | next_tss_desc.type |= (1 << 1); /* set busy flag */ | |
7b105ca2 | 2869 | write_segment_descriptor(ctxt, tss_selector, &next_tss_desc); |
38ba30ba GN |
2870 | } |
2871 | ||
717746e3 | 2872 | ops->set_cr(ctxt, 0, ops->get_cr(ctxt, 0) | X86_CR0_TS); |
1aa36616 | 2873 | ops->set_segment(ctxt, tss_selector, &next_tss_desc, 0, VCPU_SREG_TR); |
38ba30ba | 2874 | |
e269fb21 | 2875 | if (has_error_code) { |
9dac77fa AK |
2876 | ctxt->op_bytes = ctxt->ad_bytes = (next_tss_desc.type & 8) ? 4 : 2; |
2877 | ctxt->lock_prefix = 0; | |
2878 | ctxt->src.val = (unsigned long) error_code; | |
4487b3b4 | 2879 | ret = em_push(ctxt); |
e269fb21 JK |
2880 | } |
2881 | ||
38ba30ba GN |
2882 | return ret; |
2883 | } | |
2884 | ||
2885 | int emulator_task_switch(struct x86_emulate_ctxt *ctxt, | |
7f3d35fd | 2886 | u16 tss_selector, int idt_index, int reason, |
e269fb21 | 2887 | bool has_error_code, u32 error_code) |
38ba30ba | 2888 | { |
38ba30ba GN |
2889 | int rc; |
2890 | ||
dd856efa | 2891 | invalidate_registers(ctxt); |
9dac77fa AK |
2892 | ctxt->_eip = ctxt->eip; |
2893 | ctxt->dst.type = OP_NONE; | |
38ba30ba | 2894 | |
7f3d35fd | 2895 | rc = emulator_do_task_switch(ctxt, tss_selector, idt_index, reason, |
e269fb21 | 2896 | has_error_code, error_code); |
38ba30ba | 2897 | |
dd856efa | 2898 | if (rc == X86EMUL_CONTINUE) { |
9dac77fa | 2899 | ctxt->eip = ctxt->_eip; |
dd856efa AK |
2900 | writeback_registers(ctxt); |
2901 | } | |
38ba30ba | 2902 | |
a0c0ab2f | 2903 | return (rc == X86EMUL_UNHANDLEABLE) ? EMULATION_FAILED : EMULATION_OK; |
38ba30ba GN |
2904 | } |
2905 | ||
f3bd64c6 GN |
2906 | static void string_addr_inc(struct x86_emulate_ctxt *ctxt, int reg, |
2907 | struct operand *op) | |
a682e354 | 2908 | { |
b3356bf0 | 2909 | int df = (ctxt->eflags & EFLG_DF) ? -op->count : op->count; |
a682e354 | 2910 | |
01485a22 PB |
2911 | register_address_increment(ctxt, reg, df * op->bytes); |
2912 | op->addr.mem.ea = register_address(ctxt, reg); | |
a682e354 GN |
2913 | } |
2914 | ||
7af04fc0 AK |
2915 | static int em_das(struct x86_emulate_ctxt *ctxt) |
2916 | { | |
7af04fc0 AK |
2917 | u8 al, old_al; |
2918 | bool af, cf, old_cf; | |
2919 | ||
2920 | cf = ctxt->eflags & X86_EFLAGS_CF; | |
9dac77fa | 2921 | al = ctxt->dst.val; |
7af04fc0 AK |
2922 | |
2923 | old_al = al; | |
2924 | old_cf = cf; | |
2925 | cf = false; | |
2926 | af = ctxt->eflags & X86_EFLAGS_AF; | |
2927 | if ((al & 0x0f) > 9 || af) { | |
2928 | al -= 6; | |
2929 | cf = old_cf | (al >= 250); | |
2930 | af = true; | |
2931 | } else { | |
2932 | af = false; | |
2933 | } | |
2934 | if (old_al > 0x99 || old_cf) { | |
2935 | al -= 0x60; | |
2936 | cf = true; | |
2937 | } | |
2938 | ||
9dac77fa | 2939 | ctxt->dst.val = al; |
7af04fc0 | 2940 | /* Set PF, ZF, SF */ |
9dac77fa AK |
2941 | ctxt->src.type = OP_IMM; |
2942 | ctxt->src.val = 0; | |
2943 | ctxt->src.bytes = 1; | |
158de57f | 2944 | fastop(ctxt, em_or); |
7af04fc0 AK |
2945 | ctxt->eflags &= ~(X86_EFLAGS_AF | X86_EFLAGS_CF); |
2946 | if (cf) | |
2947 | ctxt->eflags |= X86_EFLAGS_CF; | |
2948 | if (af) | |
2949 | ctxt->eflags |= X86_EFLAGS_AF; | |
2950 | return X86EMUL_CONTINUE; | |
2951 | } | |
2952 | ||
a035d5c6 PB |
2953 | static int em_aam(struct x86_emulate_ctxt *ctxt) |
2954 | { | |
2955 | u8 al, ah; | |
2956 | ||
2957 | if (ctxt->src.val == 0) | |
2958 | return emulate_de(ctxt); | |
2959 | ||
2960 | al = ctxt->dst.val & 0xff; | |
2961 | ah = al / ctxt->src.val; | |
2962 | al %= ctxt->src.val; | |
2963 | ||
2964 | ctxt->dst.val = (ctxt->dst.val & 0xffff0000) | al | (ah << 8); | |
2965 | ||
2966 | /* Set PF, ZF, SF */ | |
2967 | ctxt->src.type = OP_IMM; | |
2968 | ctxt->src.val = 0; | |
2969 | ctxt->src.bytes = 1; | |
2970 | fastop(ctxt, em_or); | |
2971 | ||
2972 | return X86EMUL_CONTINUE; | |
2973 | } | |
2974 | ||
7f662273 GN |
2975 | static int em_aad(struct x86_emulate_ctxt *ctxt) |
2976 | { | |
2977 | u8 al = ctxt->dst.val & 0xff; | |
2978 | u8 ah = (ctxt->dst.val >> 8) & 0xff; | |
2979 | ||
2980 | al = (al + (ah * ctxt->src.val)) & 0xff; | |
2981 | ||
2982 | ctxt->dst.val = (ctxt->dst.val & 0xffff0000) | al; | |
2983 | ||
f583c29b GN |
2984 | /* Set PF, ZF, SF */ |
2985 | ctxt->src.type = OP_IMM; | |
2986 | ctxt->src.val = 0; | |
2987 | ctxt->src.bytes = 1; | |
2988 | fastop(ctxt, em_or); | |
7f662273 GN |
2989 | |
2990 | return X86EMUL_CONTINUE; | |
2991 | } | |
2992 | ||
d4ddafcd TY |
2993 | static int em_call(struct x86_emulate_ctxt *ctxt) |
2994 | { | |
234f3ce4 | 2995 | int rc; |
d4ddafcd TY |
2996 | long rel = ctxt->src.val; |
2997 | ||
2998 | ctxt->src.val = (unsigned long)ctxt->_eip; | |
234f3ce4 NA |
2999 | rc = jmp_rel(ctxt, rel); |
3000 | if (rc != X86EMUL_CONTINUE) | |
3001 | return rc; | |
d4ddafcd TY |
3002 | return em_push(ctxt); |
3003 | } | |
3004 | ||
0ef753b8 AK |
3005 | static int em_call_far(struct x86_emulate_ctxt *ctxt) |
3006 | { | |
0ef753b8 AK |
3007 | u16 sel, old_cs; |
3008 | ulong old_eip; | |
3009 | int rc; | |
d1442d85 NA |
3010 | struct desc_struct old_desc, new_desc; |
3011 | const struct x86_emulate_ops *ops = ctxt->ops; | |
3012 | int cpl = ctxt->ops->cpl(ctxt); | |
0ef753b8 | 3013 | |
9dac77fa | 3014 | old_eip = ctxt->_eip; |
d1442d85 | 3015 | ops->get_segment(ctxt, &old_cs, &old_desc, NULL, VCPU_SREG_CS); |
0ef753b8 | 3016 | |
9dac77fa | 3017 | memcpy(&sel, ctxt->src.valptr + ctxt->op_bytes, 2); |
d1442d85 NA |
3018 | rc = __load_segment_descriptor(ctxt, sel, VCPU_SREG_CS, cpl, false, |
3019 | &new_desc); | |
3020 | if (rc != X86EMUL_CONTINUE) | |
0ef753b8 AK |
3021 | return X86EMUL_CONTINUE; |
3022 | ||
d50eaa18 | 3023 | rc = assign_eip_far(ctxt, ctxt->src.val, &new_desc); |
d1442d85 NA |
3024 | if (rc != X86EMUL_CONTINUE) |
3025 | goto fail; | |
0ef753b8 | 3026 | |
9dac77fa | 3027 | ctxt->src.val = old_cs; |
4487b3b4 | 3028 | rc = em_push(ctxt); |
0ef753b8 | 3029 | if (rc != X86EMUL_CONTINUE) |
d1442d85 | 3030 | goto fail; |
0ef753b8 | 3031 | |
9dac77fa | 3032 | ctxt->src.val = old_eip; |
d1442d85 NA |
3033 | rc = em_push(ctxt); |
3034 | /* If we failed, we tainted the memory, but the very least we should | |
3035 | restore cs */ | |
3036 | if (rc != X86EMUL_CONTINUE) | |
3037 | goto fail; | |
3038 | return rc; | |
3039 | fail: | |
3040 | ops->set_segment(ctxt, old_cs, &old_desc, 0, VCPU_SREG_CS); | |
3041 | return rc; | |
3042 | ||
0ef753b8 AK |
3043 | } |
3044 | ||
40ece7c7 AK |
3045 | static int em_ret_near_imm(struct x86_emulate_ctxt *ctxt) |
3046 | { | |
40ece7c7 | 3047 | int rc; |
234f3ce4 | 3048 | unsigned long eip; |
40ece7c7 | 3049 | |
234f3ce4 NA |
3050 | rc = emulate_pop(ctxt, &eip, ctxt->op_bytes); |
3051 | if (rc != X86EMUL_CONTINUE) | |
3052 | return rc; | |
3053 | rc = assign_eip_near(ctxt, eip); | |
40ece7c7 AK |
3054 | if (rc != X86EMUL_CONTINUE) |
3055 | return rc; | |
5ad105e5 | 3056 | rsp_increment(ctxt, ctxt->src.val); |
40ece7c7 AK |
3057 | return X86EMUL_CONTINUE; |
3058 | } | |
3059 | ||
e4f973ae TY |
3060 | static int em_xchg(struct x86_emulate_ctxt *ctxt) |
3061 | { | |
e4f973ae | 3062 | /* Write back the register source. */ |
9dac77fa AK |
3063 | ctxt->src.val = ctxt->dst.val; |
3064 | write_register_operand(&ctxt->src); | |
e4f973ae TY |
3065 | |
3066 | /* Write back the memory destination with implicit LOCK prefix. */ | |
9dac77fa AK |
3067 | ctxt->dst.val = ctxt->src.orig_val; |
3068 | ctxt->lock_prefix = 1; | |
e4f973ae TY |
3069 | return X86EMUL_CONTINUE; |
3070 | } | |
3071 | ||
5c82aa29 AK |
3072 | static int em_imul_3op(struct x86_emulate_ctxt *ctxt) |
3073 | { | |
9dac77fa | 3074 | ctxt->dst.val = ctxt->src2.val; |
4d758349 | 3075 | return fastop(ctxt, em_imul); |
5c82aa29 AK |
3076 | } |
3077 | ||
61429142 AK |
3078 | static int em_cwd(struct x86_emulate_ctxt *ctxt) |
3079 | { | |
9dac77fa AK |
3080 | ctxt->dst.type = OP_REG; |
3081 | ctxt->dst.bytes = ctxt->src.bytes; | |
dd856efa | 3082 | ctxt->dst.addr.reg = reg_rmw(ctxt, VCPU_REGS_RDX); |
9dac77fa | 3083 | ctxt->dst.val = ~((ctxt->src.val >> (ctxt->src.bytes * 8 - 1)) - 1); |
61429142 AK |
3084 | |
3085 | return X86EMUL_CONTINUE; | |
3086 | } | |
3087 | ||
48bb5d3c AK |
3088 | static int em_rdtsc(struct x86_emulate_ctxt *ctxt) |
3089 | { | |
48bb5d3c AK |
3090 | u64 tsc = 0; |
3091 | ||
717746e3 | 3092 | ctxt->ops->get_msr(ctxt, MSR_IA32_TSC, &tsc); |
dd856efa AK |
3093 | *reg_write(ctxt, VCPU_REGS_RAX) = (u32)tsc; |
3094 | *reg_write(ctxt, VCPU_REGS_RDX) = tsc >> 32; | |
48bb5d3c AK |
3095 | return X86EMUL_CONTINUE; |
3096 | } | |
3097 | ||
222d21aa AK |
3098 | static int em_rdpmc(struct x86_emulate_ctxt *ctxt) |
3099 | { | |
3100 | u64 pmc; | |
3101 | ||
dd856efa | 3102 | if (ctxt->ops->read_pmc(ctxt, reg_read(ctxt, VCPU_REGS_RCX), &pmc)) |
222d21aa | 3103 | return emulate_gp(ctxt, 0); |
dd856efa AK |
3104 | *reg_write(ctxt, VCPU_REGS_RAX) = (u32)pmc; |
3105 | *reg_write(ctxt, VCPU_REGS_RDX) = pmc >> 32; | |
222d21aa AK |
3106 | return X86EMUL_CONTINUE; |
3107 | } | |
3108 | ||
b9eac5f4 AK |
3109 | static int em_mov(struct x86_emulate_ctxt *ctxt) |
3110 | { | |
54cfdb3e | 3111 | memcpy(ctxt->dst.valptr, ctxt->src.valptr, sizeof(ctxt->src.valptr)); |
b9eac5f4 AK |
3112 | return X86EMUL_CONTINUE; |
3113 | } | |
3114 | ||
84cffe49 BP |
3115 | #define FFL(x) bit(X86_FEATURE_##x) |
3116 | ||
3117 | static int em_movbe(struct x86_emulate_ctxt *ctxt) | |
3118 | { | |
3119 | u32 ebx, ecx, edx, eax = 1; | |
3120 | u16 tmp; | |
3121 | ||
3122 | /* | |
3123 | * Check MOVBE is set in the guest-visible CPUID leaf. | |
3124 | */ | |
3125 | ctxt->ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx); | |
3126 | if (!(ecx & FFL(MOVBE))) | |
3127 | return emulate_ud(ctxt); | |
3128 | ||
3129 | switch (ctxt->op_bytes) { | |
3130 | case 2: | |
3131 | /* | |
3132 | * From MOVBE definition: "...When the operand size is 16 bits, | |
3133 | * the upper word of the destination register remains unchanged | |
3134 | * ..." | |
3135 | * | |
3136 | * Both casting ->valptr and ->val to u16 breaks strict aliasing | |
3137 | * rules so we have to do the operation almost per hand. | |
3138 | */ | |
3139 | tmp = (u16)ctxt->src.val; | |
3140 | ctxt->dst.val &= ~0xffffUL; | |
3141 | ctxt->dst.val |= (unsigned long)swab16(tmp); | |
3142 | break; | |
3143 | case 4: | |
3144 | ctxt->dst.val = swab32((u32)ctxt->src.val); | |
3145 | break; | |
3146 | case 8: | |
3147 | ctxt->dst.val = swab64(ctxt->src.val); | |
3148 | break; | |
3149 | default: | |
592f0858 | 3150 | BUG(); |
84cffe49 BP |
3151 | } |
3152 | return X86EMUL_CONTINUE; | |
3153 | } | |
3154 | ||
bc00f8d2 TY |
3155 | static int em_cr_write(struct x86_emulate_ctxt *ctxt) |
3156 | { | |
3157 | if (ctxt->ops->set_cr(ctxt, ctxt->modrm_reg, ctxt->src.val)) | |
3158 | return emulate_gp(ctxt, 0); | |
3159 | ||
3160 | /* Disable writeback. */ | |
3161 | ctxt->dst.type = OP_NONE; | |
3162 | return X86EMUL_CONTINUE; | |
3163 | } | |
3164 | ||
3165 | static int em_dr_write(struct x86_emulate_ctxt *ctxt) | |
3166 | { | |
3167 | unsigned long val; | |
3168 | ||
3169 | if (ctxt->mode == X86EMUL_MODE_PROT64) | |
3170 | val = ctxt->src.val & ~0ULL; | |
3171 | else | |
3172 | val = ctxt->src.val & ~0U; | |
3173 | ||
3174 | /* #UD condition is already handled. */ | |
3175 | if (ctxt->ops->set_dr(ctxt, ctxt->modrm_reg, val) < 0) | |
3176 | return emulate_gp(ctxt, 0); | |
3177 | ||
3178 | /* Disable writeback. */ | |
3179 | ctxt->dst.type = OP_NONE; | |
3180 | return X86EMUL_CONTINUE; | |
3181 | } | |
3182 | ||
e1e210b0 TY |
3183 | static int em_wrmsr(struct x86_emulate_ctxt *ctxt) |
3184 | { | |
3185 | u64 msr_data; | |
3186 | ||
dd856efa AK |
3187 | msr_data = (u32)reg_read(ctxt, VCPU_REGS_RAX) |
3188 | | ((u64)reg_read(ctxt, VCPU_REGS_RDX) << 32); | |
3189 | if (ctxt->ops->set_msr(ctxt, reg_read(ctxt, VCPU_REGS_RCX), msr_data)) | |
e1e210b0 TY |
3190 | return emulate_gp(ctxt, 0); |
3191 | ||
3192 | return X86EMUL_CONTINUE; | |
3193 | } | |
3194 | ||
3195 | static int em_rdmsr(struct x86_emulate_ctxt *ctxt) | |
3196 | { | |
3197 | u64 msr_data; | |
3198 | ||
dd856efa | 3199 | if (ctxt->ops->get_msr(ctxt, reg_read(ctxt, VCPU_REGS_RCX), &msr_data)) |
e1e210b0 TY |
3200 | return emulate_gp(ctxt, 0); |
3201 | ||
dd856efa AK |
3202 | *reg_write(ctxt, VCPU_REGS_RAX) = (u32)msr_data; |
3203 | *reg_write(ctxt, VCPU_REGS_RDX) = msr_data >> 32; | |
e1e210b0 TY |
3204 | return X86EMUL_CONTINUE; |
3205 | } | |
3206 | ||
1bd5f469 TY |
3207 | static int em_mov_rm_sreg(struct x86_emulate_ctxt *ctxt) |
3208 | { | |
9dac77fa | 3209 | if (ctxt->modrm_reg > VCPU_SREG_GS) |
1bd5f469 TY |
3210 | return emulate_ud(ctxt); |
3211 | ||
9dac77fa | 3212 | ctxt->dst.val = get_segment_selector(ctxt, ctxt->modrm_reg); |
b5bbf10e NA |
3213 | if (ctxt->dst.bytes == 4 && ctxt->dst.type == OP_MEM) |
3214 | ctxt->dst.bytes = 2; | |
1bd5f469 TY |
3215 | return X86EMUL_CONTINUE; |
3216 | } | |
3217 | ||
3218 | static int em_mov_sreg_rm(struct x86_emulate_ctxt *ctxt) | |
3219 | { | |
9dac77fa | 3220 | u16 sel = ctxt->src.val; |
1bd5f469 | 3221 | |
9dac77fa | 3222 | if (ctxt->modrm_reg == VCPU_SREG_CS || ctxt->modrm_reg > VCPU_SREG_GS) |
1bd5f469 TY |
3223 | return emulate_ud(ctxt); |
3224 | ||
9dac77fa | 3225 | if (ctxt->modrm_reg == VCPU_SREG_SS) |
1bd5f469 TY |
3226 | ctxt->interruptibility = KVM_X86_SHADOW_INT_MOV_SS; |
3227 | ||
3228 | /* Disable writeback. */ | |
9dac77fa AK |
3229 | ctxt->dst.type = OP_NONE; |
3230 | return load_segment_descriptor(ctxt, sel, ctxt->modrm_reg); | |
1bd5f469 TY |
3231 | } |
3232 | ||
a14e579f AK |
3233 | static int em_lldt(struct x86_emulate_ctxt *ctxt) |
3234 | { | |
3235 | u16 sel = ctxt->src.val; | |
3236 | ||
3237 | /* Disable writeback. */ | |
3238 | ctxt->dst.type = OP_NONE; | |
3239 | return load_segment_descriptor(ctxt, sel, VCPU_SREG_LDTR); | |
3240 | } | |
3241 | ||
80890006 AK |
3242 | static int em_ltr(struct x86_emulate_ctxt *ctxt) |
3243 | { | |
3244 | u16 sel = ctxt->src.val; | |
3245 | ||
3246 | /* Disable writeback. */ | |
3247 | ctxt->dst.type = OP_NONE; | |
3248 | return load_segment_descriptor(ctxt, sel, VCPU_SREG_TR); | |
3249 | } | |
3250 | ||
38503911 AK |
3251 | static int em_invlpg(struct x86_emulate_ctxt *ctxt) |
3252 | { | |
9fa088f4 AK |
3253 | int rc; |
3254 | ulong linear; | |
3255 | ||
9dac77fa | 3256 | rc = linearize(ctxt, ctxt->src.addr.mem, 1, false, &linear); |
9fa088f4 | 3257 | if (rc == X86EMUL_CONTINUE) |
3cb16fe7 | 3258 | ctxt->ops->invlpg(ctxt, linear); |
38503911 | 3259 | /* Disable writeback. */ |
9dac77fa | 3260 | ctxt->dst.type = OP_NONE; |
38503911 AK |
3261 | return X86EMUL_CONTINUE; |
3262 | } | |
3263 | ||
2d04a05b AK |
3264 | static int em_clts(struct x86_emulate_ctxt *ctxt) |
3265 | { | |
3266 | ulong cr0; | |
3267 | ||
3268 | cr0 = ctxt->ops->get_cr(ctxt, 0); | |
3269 | cr0 &= ~X86_CR0_TS; | |
3270 | ctxt->ops->set_cr(ctxt, 0, cr0); | |
3271 | return X86EMUL_CONTINUE; | |
3272 | } | |
3273 | ||
26d05cc7 AK |
3274 | static int em_vmcall(struct x86_emulate_ctxt *ctxt) |
3275 | { | |
0f54a321 | 3276 | int rc = ctxt->ops->fix_hypercall(ctxt); |
26d05cc7 | 3277 | |
26d05cc7 AK |
3278 | if (rc != X86EMUL_CONTINUE) |
3279 | return rc; | |
3280 | ||
3281 | /* Let the processor re-execute the fixed hypercall */ | |
9dac77fa | 3282 | ctxt->_eip = ctxt->eip; |
26d05cc7 | 3283 | /* Disable writeback. */ |
9dac77fa | 3284 | ctxt->dst.type = OP_NONE; |
26d05cc7 AK |
3285 | return X86EMUL_CONTINUE; |
3286 | } | |
3287 | ||
96051572 AK |
3288 | static int emulate_store_desc_ptr(struct x86_emulate_ctxt *ctxt, |
3289 | void (*get)(struct x86_emulate_ctxt *ctxt, | |
3290 | struct desc_ptr *ptr)) | |
3291 | { | |
3292 | struct desc_ptr desc_ptr; | |
3293 | ||
3294 | if (ctxt->mode == X86EMUL_MODE_PROT64) | |
3295 | ctxt->op_bytes = 8; | |
3296 | get(ctxt, &desc_ptr); | |
3297 | if (ctxt->op_bytes == 2) { | |
3298 | ctxt->op_bytes = 4; | |
3299 | desc_ptr.address &= 0x00ffffff; | |
3300 | } | |
3301 | /* Disable writeback. */ | |
3302 | ctxt->dst.type = OP_NONE; | |
3303 | return segmented_write(ctxt, ctxt->dst.addr.mem, | |
3304 | &desc_ptr, 2 + ctxt->op_bytes); | |
3305 | } | |
3306 | ||
3307 | static int em_sgdt(struct x86_emulate_ctxt *ctxt) | |
3308 | { | |
3309 | return emulate_store_desc_ptr(ctxt, ctxt->ops->get_gdt); | |
3310 | } | |
3311 | ||
3312 | static int em_sidt(struct x86_emulate_ctxt *ctxt) | |
3313 | { | |
3314 | return emulate_store_desc_ptr(ctxt, ctxt->ops->get_idt); | |
3315 | } | |
3316 | ||
5b7f6a1e | 3317 | static int em_lgdt_lidt(struct x86_emulate_ctxt *ctxt, bool lgdt) |
26d05cc7 | 3318 | { |
26d05cc7 AK |
3319 | struct desc_ptr desc_ptr; |
3320 | int rc; | |
3321 | ||
510425ff AK |
3322 | if (ctxt->mode == X86EMUL_MODE_PROT64) |
3323 | ctxt->op_bytes = 8; | |
9dac77fa | 3324 | rc = read_descriptor(ctxt, ctxt->src.addr.mem, |
26d05cc7 | 3325 | &desc_ptr.size, &desc_ptr.address, |
9dac77fa | 3326 | ctxt->op_bytes); |
26d05cc7 AK |
3327 | if (rc != X86EMUL_CONTINUE) |
3328 | return rc; | |
9a9abf6b NA |
3329 | if (ctxt->mode == X86EMUL_MODE_PROT64 && |
3330 | is_noncanonical_address(desc_ptr.address)) | |
3331 | return emulate_gp(ctxt, 0); | |
5b7f6a1e NA |
3332 | if (lgdt) |
3333 | ctxt->ops->set_gdt(ctxt, &desc_ptr); | |
3334 | else | |
3335 | ctxt->ops->set_idt(ctxt, &desc_ptr); | |
26d05cc7 | 3336 | /* Disable writeback. */ |
9dac77fa | 3337 | ctxt->dst.type = OP_NONE; |
26d05cc7 AK |
3338 | return X86EMUL_CONTINUE; |
3339 | } | |
3340 | ||
5b7f6a1e NA |
3341 | static int em_lgdt(struct x86_emulate_ctxt *ctxt) |
3342 | { | |
3343 | return em_lgdt_lidt(ctxt, true); | |
3344 | } | |
3345 | ||
5ef39c71 | 3346 | static int em_vmmcall(struct x86_emulate_ctxt *ctxt) |
26d05cc7 | 3347 | { |
26d05cc7 AK |
3348 | int rc; |
3349 | ||
5ef39c71 AK |
3350 | rc = ctxt->ops->fix_hypercall(ctxt); |
3351 | ||
26d05cc7 | 3352 | /* Disable writeback. */ |
9dac77fa | 3353 | ctxt->dst.type = OP_NONE; |
26d05cc7 AK |
3354 | return rc; |
3355 | } | |
3356 | ||
3357 | static int em_lidt(struct x86_emulate_ctxt *ctxt) | |
3358 | { | |
5b7f6a1e | 3359 | return em_lgdt_lidt(ctxt, false); |
26d05cc7 AK |
3360 | } |
3361 | ||
3362 | static int em_smsw(struct x86_emulate_ctxt *ctxt) | |
3363 | { | |
32e94d06 NA |
3364 | if (ctxt->dst.type == OP_MEM) |
3365 | ctxt->dst.bytes = 2; | |
9dac77fa | 3366 | ctxt->dst.val = ctxt->ops->get_cr(ctxt, 0); |
26d05cc7 AK |
3367 | return X86EMUL_CONTINUE; |
3368 | } | |
3369 | ||
3370 | static int em_lmsw(struct x86_emulate_ctxt *ctxt) | |
3371 | { | |
26d05cc7 | 3372 | ctxt->ops->set_cr(ctxt, 0, (ctxt->ops->get_cr(ctxt, 0) & ~0x0eul) |
9dac77fa AK |
3373 | | (ctxt->src.val & 0x0f)); |
3374 | ctxt->dst.type = OP_NONE; | |
26d05cc7 AK |
3375 | return X86EMUL_CONTINUE; |
3376 | } | |
3377 | ||
d06e03ad TY |
3378 | static int em_loop(struct x86_emulate_ctxt *ctxt) |
3379 | { | |
234f3ce4 NA |
3380 | int rc = X86EMUL_CONTINUE; |
3381 | ||
01485a22 | 3382 | register_address_increment(ctxt, VCPU_REGS_RCX, -1); |
dd856efa | 3383 | if ((address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) != 0) && |
9dac77fa | 3384 | (ctxt->b == 0xe2 || test_cc(ctxt->b ^ 0x5, ctxt->eflags))) |
234f3ce4 | 3385 | rc = jmp_rel(ctxt, ctxt->src.val); |
d06e03ad | 3386 | |
234f3ce4 | 3387 | return rc; |
d06e03ad TY |
3388 | } |
3389 | ||
3390 | static int em_jcxz(struct x86_emulate_ctxt *ctxt) | |
3391 | { | |
234f3ce4 NA |
3392 | int rc = X86EMUL_CONTINUE; |
3393 | ||
dd856efa | 3394 | if (address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) == 0) |
234f3ce4 | 3395 | rc = jmp_rel(ctxt, ctxt->src.val); |
d06e03ad | 3396 | |
234f3ce4 | 3397 | return rc; |
d06e03ad TY |
3398 | } |
3399 | ||
d7841a4b TY |
3400 | static int em_in(struct x86_emulate_ctxt *ctxt) |
3401 | { | |
3402 | if (!pio_in_emulated(ctxt, ctxt->dst.bytes, ctxt->src.val, | |
3403 | &ctxt->dst.val)) | |
3404 | return X86EMUL_IO_NEEDED; | |
3405 | ||
3406 | return X86EMUL_CONTINUE; | |
3407 | } | |
3408 | ||
3409 | static int em_out(struct x86_emulate_ctxt *ctxt) | |
3410 | { | |
3411 | ctxt->ops->pio_out_emulated(ctxt, ctxt->src.bytes, ctxt->dst.val, | |
3412 | &ctxt->src.val, 1); | |
3413 | /* Disable writeback. */ | |
3414 | ctxt->dst.type = OP_NONE; | |
3415 | return X86EMUL_CONTINUE; | |
3416 | } | |
3417 | ||
f411e6cd TY |
3418 | static int em_cli(struct x86_emulate_ctxt *ctxt) |
3419 | { | |
3420 | if (emulator_bad_iopl(ctxt)) | |
3421 | return emulate_gp(ctxt, 0); | |
3422 | ||
3423 | ctxt->eflags &= ~X86_EFLAGS_IF; | |
3424 | return X86EMUL_CONTINUE; | |
3425 | } | |
3426 | ||
3427 | static int em_sti(struct x86_emulate_ctxt *ctxt) | |
3428 | { | |
3429 | if (emulator_bad_iopl(ctxt)) | |
3430 | return emulate_gp(ctxt, 0); | |
3431 | ||
3432 | ctxt->interruptibility = KVM_X86_SHADOW_INT_STI; | |
3433 | ctxt->eflags |= X86_EFLAGS_IF; | |
3434 | return X86EMUL_CONTINUE; | |
3435 | } | |
3436 | ||
6d6eede4 AK |
3437 | static int em_cpuid(struct x86_emulate_ctxt *ctxt) |
3438 | { | |
3439 | u32 eax, ebx, ecx, edx; | |
3440 | ||
dd856efa AK |
3441 | eax = reg_read(ctxt, VCPU_REGS_RAX); |
3442 | ecx = reg_read(ctxt, VCPU_REGS_RCX); | |
6d6eede4 | 3443 | ctxt->ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx); |
dd856efa AK |
3444 | *reg_write(ctxt, VCPU_REGS_RAX) = eax; |
3445 | *reg_write(ctxt, VCPU_REGS_RBX) = ebx; | |
3446 | *reg_write(ctxt, VCPU_REGS_RCX) = ecx; | |
3447 | *reg_write(ctxt, VCPU_REGS_RDX) = edx; | |
6d6eede4 AK |
3448 | return X86EMUL_CONTINUE; |
3449 | } | |
3450 | ||
98f73630 PB |
3451 | static int em_sahf(struct x86_emulate_ctxt *ctxt) |
3452 | { | |
3453 | u32 flags; | |
3454 | ||
3455 | flags = EFLG_CF | EFLG_PF | EFLG_AF | EFLG_ZF | EFLG_SF; | |
3456 | flags &= *reg_rmw(ctxt, VCPU_REGS_RAX) >> 8; | |
3457 | ||
3458 | ctxt->eflags &= ~0xffUL; | |
3459 | ctxt->eflags |= flags | X86_EFLAGS_FIXED; | |
3460 | return X86EMUL_CONTINUE; | |
3461 | } | |
3462 | ||
2dd7caa0 AK |
3463 | static int em_lahf(struct x86_emulate_ctxt *ctxt) |
3464 | { | |
dd856efa AK |
3465 | *reg_rmw(ctxt, VCPU_REGS_RAX) &= ~0xff00UL; |
3466 | *reg_rmw(ctxt, VCPU_REGS_RAX) |= (ctxt->eflags & 0xff) << 8; | |
2dd7caa0 AK |
3467 | return X86EMUL_CONTINUE; |
3468 | } | |
3469 | ||
9299836e AK |
3470 | static int em_bswap(struct x86_emulate_ctxt *ctxt) |
3471 | { | |
3472 | switch (ctxt->op_bytes) { | |
3473 | #ifdef CONFIG_X86_64 | |
3474 | case 8: | |
3475 | asm("bswap %0" : "+r"(ctxt->dst.val)); | |
3476 | break; | |
3477 | #endif | |
3478 | default: | |
3479 | asm("bswap %0" : "+r"(*(u32 *)&ctxt->dst.val)); | |
3480 | break; | |
3481 | } | |
3482 | return X86EMUL_CONTINUE; | |
3483 | } | |
3484 | ||
13e457e0 NA |
3485 | static int em_clflush(struct x86_emulate_ctxt *ctxt) |
3486 | { | |
3487 | /* emulating clflush regardless of cpuid */ | |
3488 | return X86EMUL_CONTINUE; | |
3489 | } | |
3490 | ||
cfec82cb JR |
3491 | static bool valid_cr(int nr) |
3492 | { | |
3493 | switch (nr) { | |
3494 | case 0: | |
3495 | case 2 ... 4: | |
3496 | case 8: | |
3497 | return true; | |
3498 | default: | |
3499 | return false; | |
3500 | } | |
3501 | } | |
3502 | ||
3503 | static int check_cr_read(struct x86_emulate_ctxt *ctxt) | |
3504 | { | |
9dac77fa | 3505 | if (!valid_cr(ctxt->modrm_reg)) |
cfec82cb JR |
3506 | return emulate_ud(ctxt); |
3507 | ||
3508 | return X86EMUL_CONTINUE; | |
3509 | } | |
3510 | ||
3511 | static int check_cr_write(struct x86_emulate_ctxt *ctxt) | |
3512 | { | |
9dac77fa AK |
3513 | u64 new_val = ctxt->src.val64; |
3514 | int cr = ctxt->modrm_reg; | |
c2ad2bb3 | 3515 | u64 efer = 0; |
cfec82cb JR |
3516 | |
3517 | static u64 cr_reserved_bits[] = { | |
3518 | 0xffffffff00000000ULL, | |
3519 | 0, 0, 0, /* CR3 checked later */ | |
3520 | CR4_RESERVED_BITS, | |
3521 | 0, 0, 0, | |
3522 | CR8_RESERVED_BITS, | |
3523 | }; | |
3524 | ||
3525 | if (!valid_cr(cr)) | |
3526 | return emulate_ud(ctxt); | |
3527 | ||
3528 | if (new_val & cr_reserved_bits[cr]) | |
3529 | return emulate_gp(ctxt, 0); | |
3530 | ||
3531 | switch (cr) { | |
3532 | case 0: { | |
c2ad2bb3 | 3533 | u64 cr4; |
cfec82cb JR |
3534 | if (((new_val & X86_CR0_PG) && !(new_val & X86_CR0_PE)) || |
3535 | ((new_val & X86_CR0_NW) && !(new_val & X86_CR0_CD))) | |
3536 | return emulate_gp(ctxt, 0); | |
3537 | ||
717746e3 AK |
3538 | cr4 = ctxt->ops->get_cr(ctxt, 4); |
3539 | ctxt->ops->get_msr(ctxt, MSR_EFER, &efer); | |
cfec82cb JR |
3540 | |
3541 | if ((new_val & X86_CR0_PG) && (efer & EFER_LME) && | |
3542 | !(cr4 & X86_CR4_PAE)) | |
3543 | return emulate_gp(ctxt, 0); | |
3544 | ||
3545 | break; | |
3546 | } | |
3547 | case 3: { | |
3548 | u64 rsvd = 0; | |
3549 | ||
c2ad2bb3 AK |
3550 | ctxt->ops->get_msr(ctxt, MSR_EFER, &efer); |
3551 | if (efer & EFER_LMA) | |
9d88fca7 | 3552 | rsvd = CR3_L_MODE_RESERVED_BITS & ~CR3_PCID_INVD; |
cfec82cb JR |
3553 | |
3554 | if (new_val & rsvd) | |
3555 | return emulate_gp(ctxt, 0); | |
3556 | ||
3557 | break; | |
3558 | } | |
3559 | case 4: { | |
717746e3 | 3560 | ctxt->ops->get_msr(ctxt, MSR_EFER, &efer); |
cfec82cb JR |
3561 | |
3562 | if ((efer & EFER_LMA) && !(new_val & X86_CR4_PAE)) | |
3563 | return emulate_gp(ctxt, 0); | |
3564 | ||
3565 | break; | |
3566 | } | |
3567 | } | |
3568 | ||
3569 | return X86EMUL_CONTINUE; | |
3570 | } | |
3571 | ||
3b88e41a JR |
3572 | static int check_dr7_gd(struct x86_emulate_ctxt *ctxt) |
3573 | { | |
3574 | unsigned long dr7; | |
3575 | ||
717746e3 | 3576 | ctxt->ops->get_dr(ctxt, 7, &dr7); |
3b88e41a JR |
3577 | |
3578 | /* Check if DR7.Global_Enable is set */ | |
3579 | return dr7 & (1 << 13); | |
3580 | } | |
3581 | ||
3582 | static int check_dr_read(struct x86_emulate_ctxt *ctxt) | |
3583 | { | |
9dac77fa | 3584 | int dr = ctxt->modrm_reg; |
3b88e41a JR |
3585 | u64 cr4; |
3586 | ||
3587 | if (dr > 7) | |
3588 | return emulate_ud(ctxt); | |
3589 | ||
717746e3 | 3590 | cr4 = ctxt->ops->get_cr(ctxt, 4); |
3b88e41a JR |
3591 | if ((cr4 & X86_CR4_DE) && (dr == 4 || dr == 5)) |
3592 | return emulate_ud(ctxt); | |
3593 | ||
6d2a0526 NA |
3594 | if (check_dr7_gd(ctxt)) { |
3595 | ulong dr6; | |
3596 | ||
3597 | ctxt->ops->get_dr(ctxt, 6, &dr6); | |
3598 | dr6 &= ~15; | |
3599 | dr6 |= DR6_BD | DR6_RTM; | |
3600 | ctxt->ops->set_dr(ctxt, 6, dr6); | |
3b88e41a | 3601 | return emulate_db(ctxt); |
6d2a0526 | 3602 | } |
3b88e41a JR |
3603 | |
3604 | return X86EMUL_CONTINUE; | |
3605 | } | |
3606 | ||
3607 | static int check_dr_write(struct x86_emulate_ctxt *ctxt) | |
3608 | { | |
9dac77fa AK |
3609 | u64 new_val = ctxt->src.val64; |
3610 | int dr = ctxt->modrm_reg; | |
3b88e41a JR |
3611 | |
3612 | if ((dr == 6 || dr == 7) && (new_val & 0xffffffff00000000ULL)) | |
3613 | return emulate_gp(ctxt, 0); | |
3614 | ||
3615 | return check_dr_read(ctxt); | |
3616 | } | |
3617 | ||
01de8b09 JR |
3618 | static int check_svme(struct x86_emulate_ctxt *ctxt) |
3619 | { | |
3620 | u64 efer; | |
3621 | ||
717746e3 | 3622 | ctxt->ops->get_msr(ctxt, MSR_EFER, &efer); |
01de8b09 JR |
3623 | |
3624 | if (!(efer & EFER_SVME)) | |
3625 | return emulate_ud(ctxt); | |
3626 | ||
3627 | return X86EMUL_CONTINUE; | |
3628 | } | |
3629 | ||
3630 | static int check_svme_pa(struct x86_emulate_ctxt *ctxt) | |
3631 | { | |
dd856efa | 3632 | u64 rax = reg_read(ctxt, VCPU_REGS_RAX); |
01de8b09 JR |
3633 | |
3634 | /* Valid physical address? */ | |
d4224449 | 3635 | if (rax & 0xffff000000000000ULL) |
01de8b09 JR |
3636 | return emulate_gp(ctxt, 0); |
3637 | ||
3638 | return check_svme(ctxt); | |
3639 | } | |
3640 | ||
d7eb8203 JR |
3641 | static int check_rdtsc(struct x86_emulate_ctxt *ctxt) |
3642 | { | |
717746e3 | 3643 | u64 cr4 = ctxt->ops->get_cr(ctxt, 4); |
d7eb8203 | 3644 | |
717746e3 | 3645 | if (cr4 & X86_CR4_TSD && ctxt->ops->cpl(ctxt)) |
d7eb8203 JR |
3646 | return emulate_ud(ctxt); |
3647 | ||
3648 | return X86EMUL_CONTINUE; | |
3649 | } | |
3650 | ||
8061252e JR |
3651 | static int check_rdpmc(struct x86_emulate_ctxt *ctxt) |
3652 | { | |
717746e3 | 3653 | u64 cr4 = ctxt->ops->get_cr(ctxt, 4); |
dd856efa | 3654 | u64 rcx = reg_read(ctxt, VCPU_REGS_RCX); |
8061252e | 3655 | |
717746e3 | 3656 | if ((!(cr4 & X86_CR4_PCE) && ctxt->ops->cpl(ctxt)) || |
67f4d428 | 3657 | ctxt->ops->check_pmc(ctxt, rcx)) |
8061252e JR |
3658 | return emulate_gp(ctxt, 0); |
3659 | ||
3660 | return X86EMUL_CONTINUE; | |
3661 | } | |
3662 | ||
f6511935 JR |
3663 | static int check_perm_in(struct x86_emulate_ctxt *ctxt) |
3664 | { | |
9dac77fa AK |
3665 | ctxt->dst.bytes = min(ctxt->dst.bytes, 4u); |
3666 | if (!emulator_io_permited(ctxt, ctxt->src.val, ctxt->dst.bytes)) | |
f6511935 JR |
3667 | return emulate_gp(ctxt, 0); |
3668 | ||
3669 | return X86EMUL_CONTINUE; | |
3670 | } | |
3671 | ||
3672 | static int check_perm_out(struct x86_emulate_ctxt *ctxt) | |
3673 | { | |
9dac77fa AK |
3674 | ctxt->src.bytes = min(ctxt->src.bytes, 4u); |
3675 | if (!emulator_io_permited(ctxt, ctxt->dst.val, ctxt->src.bytes)) | |
f6511935 JR |
3676 | return emulate_gp(ctxt, 0); |
3677 | ||
3678 | return X86EMUL_CONTINUE; | |
3679 | } | |
3680 | ||
73fba5f4 | 3681 | #define D(_y) { .flags = (_y) } |
d40a6898 PB |
3682 | #define DI(_y, _i) { .flags = (_y)|Intercept, .intercept = x86_intercept_##_i } |
3683 | #define DIP(_y, _i, _p) { .flags = (_y)|Intercept|CheckPerm, \ | |
3684 | .intercept = x86_intercept_##_i, .check_perm = (_p) } | |
0b789eee | 3685 | #define N D(NotImpl) |
01de8b09 | 3686 | #define EXT(_f, _e) { .flags = ((_f) | RMExt), .u.group = (_e) } |
1c2545be TY |
3687 | #define G(_f, _g) { .flags = ((_f) | Group | ModRM), .u.group = (_g) } |
3688 | #define GD(_f, _g) { .flags = ((_f) | GroupDual | ModRM), .u.gdual = (_g) } | |
39f062ff | 3689 | #define ID(_f, _i) { .flags = ((_f) | InstrDual | ModRM), .u.idual = (_i) } |
045a282c | 3690 | #define E(_f, _e) { .flags = ((_f) | Escape | ModRM), .u.esc = (_e) } |
73fba5f4 | 3691 | #define I(_f, _e) { .flags = (_f), .u.execute = (_e) } |
e28bbd44 | 3692 | #define F(_f, _e) { .flags = (_f) | Fastop, .u.fastop = (_e) } |
c4f035c6 | 3693 | #define II(_f, _e, _i) \ |
d40a6898 | 3694 | { .flags = (_f)|Intercept, .u.execute = (_e), .intercept = x86_intercept_##_i } |
d09beabd | 3695 | #define IIP(_f, _e, _i, _p) \ |
d40a6898 PB |
3696 | { .flags = (_f)|Intercept|CheckPerm, .u.execute = (_e), \ |
3697 | .intercept = x86_intercept_##_i, .check_perm = (_p) } | |
aa97bb48 | 3698 | #define GP(_f, _g) { .flags = ((_f) | Prefix), .u.gprefix = (_g) } |
73fba5f4 | 3699 | |
8d8f4e9f | 3700 | #define D2bv(_f) D((_f) | ByteOp), D(_f) |
f6511935 | 3701 | #define D2bvIP(_f, _i, _p) DIP((_f) | ByteOp, _i, _p), DIP(_f, _i, _p) |
8d8f4e9f | 3702 | #define I2bv(_f, _e) I((_f) | ByteOp, _e), I(_f, _e) |
f7857f35 | 3703 | #define F2bv(_f, _e) F((_f) | ByteOp, _e), F(_f, _e) |
d7841a4b TY |
3704 | #define I2bvIP(_f, _e, _i, _p) \ |
3705 | IIP((_f) | ByteOp, _e, _i, _p), IIP(_f, _e, _i, _p) | |
8d8f4e9f | 3706 | |
fb864fbc AK |
3707 | #define F6ALU(_f, _e) F2bv((_f) | DstMem | SrcReg | ModRM, _e), \ |
3708 | F2bv(((_f) | DstReg | SrcMem | ModRM) & ~Lock, _e), \ | |
3709 | F2bv(((_f) & ~Lock) | DstAcc | SrcImm, _e) | |
6230f7fc | 3710 | |
0f54a321 NA |
3711 | static const struct opcode group7_rm0[] = { |
3712 | N, | |
3713 | I(SrcNone | Priv | EmulateOnUD, em_vmcall), | |
3714 | N, N, N, N, N, N, | |
3715 | }; | |
3716 | ||
fd0a0d82 | 3717 | static const struct opcode group7_rm1[] = { |
1c2545be TY |
3718 | DI(SrcNone | Priv, monitor), |
3719 | DI(SrcNone | Priv, mwait), | |
d7eb8203 JR |
3720 | N, N, N, N, N, N, |
3721 | }; | |
3722 | ||
fd0a0d82 | 3723 | static const struct opcode group7_rm3[] = { |
1c2545be | 3724 | DIP(SrcNone | Prot | Priv, vmrun, check_svme_pa), |
b51e974f | 3725 | II(SrcNone | Prot | EmulateOnUD, em_vmmcall, vmmcall), |
1c2545be TY |
3726 | DIP(SrcNone | Prot | Priv, vmload, check_svme_pa), |
3727 | DIP(SrcNone | Prot | Priv, vmsave, check_svme_pa), | |
3728 | DIP(SrcNone | Prot | Priv, stgi, check_svme), | |
3729 | DIP(SrcNone | Prot | Priv, clgi, check_svme), | |
3730 | DIP(SrcNone | Prot | Priv, skinit, check_svme), | |
3731 | DIP(SrcNone | Prot | Priv, invlpga, check_svme), | |
01de8b09 | 3732 | }; |
6230f7fc | 3733 | |
fd0a0d82 | 3734 | static const struct opcode group7_rm7[] = { |
d7eb8203 | 3735 | N, |
1c2545be | 3736 | DIP(SrcNone, rdtscp, check_rdtsc), |
d7eb8203 JR |
3737 | N, N, N, N, N, N, |
3738 | }; | |
d67fc27a | 3739 | |
fd0a0d82 | 3740 | static const struct opcode group1[] = { |
fb864fbc AK |
3741 | F(Lock, em_add), |
3742 | F(Lock | PageTable, em_or), | |
3743 | F(Lock, em_adc), | |
3744 | F(Lock, em_sbb), | |
3745 | F(Lock | PageTable, em_and), | |
3746 | F(Lock, em_sub), | |
3747 | F(Lock, em_xor), | |
3748 | F(NoWrite, em_cmp), | |
73fba5f4 AK |
3749 | }; |
3750 | ||
fd0a0d82 | 3751 | static const struct opcode group1A[] = { |
1c2545be | 3752 | I(DstMem | SrcNone | Mov | Stack, em_pop), N, N, N, N, N, N, N, |
73fba5f4 AK |
3753 | }; |
3754 | ||
007a3b54 AK |
3755 | static const struct opcode group2[] = { |
3756 | F(DstMem | ModRM, em_rol), | |
3757 | F(DstMem | ModRM, em_ror), | |
3758 | F(DstMem | ModRM, em_rcl), | |
3759 | F(DstMem | ModRM, em_rcr), | |
3760 | F(DstMem | ModRM, em_shl), | |
3761 | F(DstMem | ModRM, em_shr), | |
3762 | F(DstMem | ModRM, em_shl), | |
3763 | F(DstMem | ModRM, em_sar), | |
3764 | }; | |
3765 | ||
fd0a0d82 | 3766 | static const struct opcode group3[] = { |
fb864fbc AK |
3767 | F(DstMem | SrcImm | NoWrite, em_test), |
3768 | F(DstMem | SrcImm | NoWrite, em_test), | |
45a1467d AK |
3769 | F(DstMem | SrcNone | Lock, em_not), |
3770 | F(DstMem | SrcNone | Lock, em_neg), | |
b9fa409b AK |
3771 | F(DstXacc | Src2Mem, em_mul_ex), |
3772 | F(DstXacc | Src2Mem, em_imul_ex), | |
b8c0b6ae AK |
3773 | F(DstXacc | Src2Mem, em_div_ex), |
3774 | F(DstXacc | Src2Mem, em_idiv_ex), | |
73fba5f4 AK |
3775 | }; |
3776 | ||
fd0a0d82 | 3777 | static const struct opcode group4[] = { |
95413dc4 AK |
3778 | F(ByteOp | DstMem | SrcNone | Lock, em_inc), |
3779 | F(ByteOp | DstMem | SrcNone | Lock, em_dec), | |
73fba5f4 AK |
3780 | N, N, N, N, N, N, |
3781 | }; | |
3782 | ||
fd0a0d82 | 3783 | static const struct opcode group5[] = { |
95413dc4 AK |
3784 | F(DstMem | SrcNone | Lock, em_inc), |
3785 | F(DstMem | SrcNone | Lock, em_dec), | |
58b7075d | 3786 | I(SrcMem | NearBranch, em_call_near_abs), |
1c2545be | 3787 | I(SrcMemFAddr | ImplicitOps | Stack, em_call_far), |
58b7075d | 3788 | I(SrcMem | NearBranch, em_jmp_abs), |
f7784046 NA |
3789 | I(SrcMemFAddr | ImplicitOps, em_jmp_far), |
3790 | I(SrcMem | Stack, em_push), D(Undefined), | |
73fba5f4 AK |
3791 | }; |
3792 | ||
fd0a0d82 | 3793 | static const struct opcode group6[] = { |
1c2545be TY |
3794 | DI(Prot, sldt), |
3795 | DI(Prot, str), | |
a14e579f | 3796 | II(Prot | Priv | SrcMem16, em_lldt, lldt), |
80890006 | 3797 | II(Prot | Priv | SrcMem16, em_ltr, ltr), |
dee6bb70 JR |
3798 | N, N, N, N, |
3799 | }; | |
3800 | ||
fd0a0d82 | 3801 | static const struct group_dual group7 = { { |
606b1c3e NA |
3802 | II(Mov | DstMem, em_sgdt, sgdt), |
3803 | II(Mov | DstMem, em_sidt, sidt), | |
1c2545be TY |
3804 | II(SrcMem | Priv, em_lgdt, lgdt), |
3805 | II(SrcMem | Priv, em_lidt, lidt), | |
3806 | II(SrcNone | DstMem | Mov, em_smsw, smsw), N, | |
3807 | II(SrcMem16 | Mov | Priv, em_lmsw, lmsw), | |
3808 | II(SrcMem | ByteOp | Priv | NoAccess, em_invlpg, invlpg), | |
73fba5f4 | 3809 | }, { |
0f54a321 | 3810 | EXT(0, group7_rm0), |
5ef39c71 | 3811 | EXT(0, group7_rm1), |
01de8b09 | 3812 | N, EXT(0, group7_rm3), |
1c2545be TY |
3813 | II(SrcNone | DstMem | Mov, em_smsw, smsw), N, |
3814 | II(SrcMem16 | Mov | Priv, em_lmsw, lmsw), | |
3815 | EXT(0, group7_rm7), | |
73fba5f4 AK |
3816 | } }; |
3817 | ||
fd0a0d82 | 3818 | static const struct opcode group8[] = { |
73fba5f4 | 3819 | N, N, N, N, |
11c363ba AK |
3820 | F(DstMem | SrcImmByte | NoWrite, em_bt), |
3821 | F(DstMem | SrcImmByte | Lock | PageTable, em_bts), | |
3822 | F(DstMem | SrcImmByte | Lock, em_btr), | |
3823 | F(DstMem | SrcImmByte | Lock | PageTable, em_btc), | |
73fba5f4 AK |
3824 | }; |
3825 | ||
fd0a0d82 | 3826 | static const struct group_dual group9 = { { |
1c2545be | 3827 | N, I(DstMem64 | Lock | PageTable, em_cmpxchg8b), N, N, N, N, N, N, |
73fba5f4 AK |
3828 | }, { |
3829 | N, N, N, N, N, N, N, N, | |
3830 | } }; | |
3831 | ||
fd0a0d82 | 3832 | static const struct opcode group11[] = { |
1c2545be | 3833 | I(DstMem | SrcImm | Mov | PageTable, em_mov), |
d5ae7ce8 | 3834 | X7(D(Undefined)), |
a4d4a7c1 AK |
3835 | }; |
3836 | ||
13e457e0 | 3837 | static const struct gprefix pfx_0f_ae_7 = { |
3f6f1480 | 3838 | I(SrcMem | ByteOp, em_clflush), N, N, N, |
13e457e0 NA |
3839 | }; |
3840 | ||
3841 | static const struct group_dual group15 = { { | |
3842 | N, N, N, N, N, N, N, GP(0, &pfx_0f_ae_7), | |
3843 | }, { | |
3844 | N, N, N, N, N, N, N, N, | |
3845 | } }; | |
3846 | ||
fd0a0d82 | 3847 | static const struct gprefix pfx_0f_6f_0f_7f = { |
e5971755 | 3848 | I(Mmx, em_mov), I(Sse | Aligned, em_mov), N, I(Sse | Unaligned, em_mov), |
aa97bb48 AK |
3849 | }; |
3850 | ||
39f062ff NA |
3851 | static const struct instr_dual instr_dual_0f_2b = { |
3852 | I(0, em_mov), N | |
3853 | }; | |
3854 | ||
d5b77069 | 3855 | static const struct gprefix pfx_0f_2b = { |
39f062ff | 3856 | ID(0, &instr_dual_0f_2b), ID(0, &instr_dual_0f_2b), N, N, |
3e114eb4 AK |
3857 | }; |
3858 | ||
27ce8258 | 3859 | static const struct gprefix pfx_0f_28_0f_29 = { |
6fec27d8 | 3860 | I(Aligned, em_mov), I(Aligned, em_mov), N, N, |
27ce8258 IM |
3861 | }; |
3862 | ||
0a37027e AW |
3863 | static const struct gprefix pfx_0f_e7 = { |
3864 | N, I(Sse, em_mov), N, N, | |
3865 | }; | |
3866 | ||
045a282c GN |
3867 | static const struct escape escape_d9 = { { |
3868 | N, N, N, N, N, N, N, I(DstMem, em_fnstcw), | |
3869 | }, { | |
3870 | /* 0xC0 - 0xC7 */ | |
3871 | N, N, N, N, N, N, N, N, | |
3872 | /* 0xC8 - 0xCF */ | |
3873 | N, N, N, N, N, N, N, N, | |
3874 | /* 0xD0 - 0xC7 */ | |
3875 | N, N, N, N, N, N, N, N, | |
3876 | /* 0xD8 - 0xDF */ | |
3877 | N, N, N, N, N, N, N, N, | |
3878 | /* 0xE0 - 0xE7 */ | |
3879 | N, N, N, N, N, N, N, N, | |
3880 | /* 0xE8 - 0xEF */ | |
3881 | N, N, N, N, N, N, N, N, | |
3882 | /* 0xF0 - 0xF7 */ | |
3883 | N, N, N, N, N, N, N, N, | |
3884 | /* 0xF8 - 0xFF */ | |
3885 | N, N, N, N, N, N, N, N, | |
3886 | } }; | |
3887 | ||
3888 | static const struct escape escape_db = { { | |
3889 | N, N, N, N, N, N, N, N, | |
3890 | }, { | |
3891 | /* 0xC0 - 0xC7 */ | |
3892 | N, N, N, N, N, N, N, N, | |
3893 | /* 0xC8 - 0xCF */ | |
3894 | N, N, N, N, N, N, N, N, | |
3895 | /* 0xD0 - 0xC7 */ | |
3896 | N, N, N, N, N, N, N, N, | |
3897 | /* 0xD8 - 0xDF */ | |
3898 | N, N, N, N, N, N, N, N, | |
3899 | /* 0xE0 - 0xE7 */ | |
3900 | N, N, N, I(ImplicitOps, em_fninit), N, N, N, N, | |
3901 | /* 0xE8 - 0xEF */ | |
3902 | N, N, N, N, N, N, N, N, | |
3903 | /* 0xF0 - 0xF7 */ | |
3904 | N, N, N, N, N, N, N, N, | |
3905 | /* 0xF8 - 0xFF */ | |
3906 | N, N, N, N, N, N, N, N, | |
3907 | } }; | |
3908 | ||
3909 | static const struct escape escape_dd = { { | |
3910 | N, N, N, N, N, N, N, I(DstMem, em_fnstsw), | |
3911 | }, { | |
3912 | /* 0xC0 - 0xC7 */ | |
3913 | N, N, N, N, N, N, N, N, | |
3914 | /* 0xC8 - 0xCF */ | |
3915 | N, N, N, N, N, N, N, N, | |
3916 | /* 0xD0 - 0xC7 */ | |
3917 | N, N, N, N, N, N, N, N, | |
3918 | /* 0xD8 - 0xDF */ | |
3919 | N, N, N, N, N, N, N, N, | |
3920 | /* 0xE0 - 0xE7 */ | |
3921 | N, N, N, N, N, N, N, N, | |
3922 | /* 0xE8 - 0xEF */ | |
3923 | N, N, N, N, N, N, N, N, | |
3924 | /* 0xF0 - 0xF7 */ | |
3925 | N, N, N, N, N, N, N, N, | |
3926 | /* 0xF8 - 0xFF */ | |
3927 | N, N, N, N, N, N, N, N, | |
3928 | } }; | |
3929 | ||
39f062ff NA |
3930 | static const struct instr_dual instr_dual_0f_c3 = { |
3931 | I(DstMem | SrcReg | ModRM | No16 | Mov, em_mov), N | |
3932 | }; | |
3933 | ||
fd0a0d82 | 3934 | static const struct opcode opcode_table[256] = { |
73fba5f4 | 3935 | /* 0x00 - 0x07 */ |
fb864fbc | 3936 | F6ALU(Lock, em_add), |
1cd196ea AK |
3937 | I(ImplicitOps | Stack | No64 | Src2ES, em_push_sreg), |
3938 | I(ImplicitOps | Stack | No64 | Src2ES, em_pop_sreg), | |
73fba5f4 | 3939 | /* 0x08 - 0x0F */ |
fb864fbc | 3940 | F6ALU(Lock | PageTable, em_or), |
1cd196ea AK |
3941 | I(ImplicitOps | Stack | No64 | Src2CS, em_push_sreg), |
3942 | N, | |
73fba5f4 | 3943 | /* 0x10 - 0x17 */ |
fb864fbc | 3944 | F6ALU(Lock, em_adc), |
1cd196ea AK |
3945 | I(ImplicitOps | Stack | No64 | Src2SS, em_push_sreg), |
3946 | I(ImplicitOps | Stack | No64 | Src2SS, em_pop_sreg), | |
73fba5f4 | 3947 | /* 0x18 - 0x1F */ |
fb864fbc | 3948 | F6ALU(Lock, em_sbb), |
1cd196ea AK |
3949 | I(ImplicitOps | Stack | No64 | Src2DS, em_push_sreg), |
3950 | I(ImplicitOps | Stack | No64 | Src2DS, em_pop_sreg), | |
73fba5f4 | 3951 | /* 0x20 - 0x27 */ |
fb864fbc | 3952 | F6ALU(Lock | PageTable, em_and), N, N, |
73fba5f4 | 3953 | /* 0x28 - 0x2F */ |
fb864fbc | 3954 | F6ALU(Lock, em_sub), N, I(ByteOp | DstAcc | No64, em_das), |
73fba5f4 | 3955 | /* 0x30 - 0x37 */ |
fb864fbc | 3956 | F6ALU(Lock, em_xor), N, N, |
73fba5f4 | 3957 | /* 0x38 - 0x3F */ |
fb864fbc | 3958 | F6ALU(NoWrite, em_cmp), N, N, |
73fba5f4 | 3959 | /* 0x40 - 0x4F */ |
95413dc4 | 3960 | X8(F(DstReg, em_inc)), X8(F(DstReg, em_dec)), |
73fba5f4 | 3961 | /* 0x50 - 0x57 */ |
63540382 | 3962 | X8(I(SrcReg | Stack, em_push)), |
73fba5f4 | 3963 | /* 0x58 - 0x5F */ |
c54fe504 | 3964 | X8(I(DstReg | Stack, em_pop)), |
73fba5f4 | 3965 | /* 0x60 - 0x67 */ |
b96a7fad TY |
3966 | I(ImplicitOps | Stack | No64, em_pusha), |
3967 | I(ImplicitOps | Stack | No64, em_popa), | |
73fba5f4 AK |
3968 | N, D(DstReg | SrcMem32 | ModRM | Mov) /* movsxd (x86/64) */ , |
3969 | N, N, N, N, | |
3970 | /* 0x68 - 0x6F */ | |
d46164db AK |
3971 | I(SrcImm | Mov | Stack, em_push), |
3972 | I(DstReg | SrcMem | ModRM | Src2Imm, em_imul_3op), | |
f3a1b9f4 AK |
3973 | I(SrcImmByte | Mov | Stack, em_push), |
3974 | I(DstReg | SrcMem | ModRM | Src2ImmByte, em_imul_3op), | |
b3356bf0 | 3975 | I2bvIP(DstDI | SrcDX | Mov | String | Unaligned, em_in, ins, check_perm_in), /* insb, insw/insd */ |
2b5e97e1 | 3976 | I2bvIP(SrcSI | DstDX | String, em_out, outs, check_perm_out), /* outsb, outsw/outsd */ |
73fba5f4 | 3977 | /* 0x70 - 0x7F */ |
58b7075d | 3978 | X16(D(SrcImmByte | NearBranch)), |
73fba5f4 | 3979 | /* 0x80 - 0x87 */ |
1c2545be TY |
3980 | G(ByteOp | DstMem | SrcImm, group1), |
3981 | G(DstMem | SrcImm, group1), | |
3982 | G(ByteOp | DstMem | SrcImm | No64, group1), | |
3983 | G(DstMem | SrcImmByte, group1), | |
fb864fbc | 3984 | F2bv(DstMem | SrcReg | ModRM | NoWrite, em_test), |
d5ae7ce8 | 3985 | I2bv(DstMem | SrcReg | ModRM | Lock | PageTable, em_xchg), |
73fba5f4 | 3986 | /* 0x88 - 0x8F */ |
d5ae7ce8 | 3987 | I2bv(DstMem | SrcReg | ModRM | Mov | PageTable, em_mov), |
b9eac5f4 | 3988 | I2bv(DstReg | SrcMem | ModRM | Mov, em_mov), |
d5ae7ce8 | 3989 | I(DstMem | SrcNone | ModRM | Mov | PageTable, em_mov_rm_sreg), |
1bd5f469 TY |
3990 | D(ModRM | SrcMem | NoAccess | DstReg), |
3991 | I(ImplicitOps | SrcMem16 | ModRM, em_mov_sreg_rm), | |
3992 | G(0, group1A), | |
73fba5f4 | 3993 | /* 0x90 - 0x97 */ |
bf608f88 | 3994 | DI(SrcAcc | DstReg, pause), X7(D(SrcAcc | DstReg)), |
73fba5f4 | 3995 | /* 0x98 - 0x9F */ |
61429142 | 3996 | D(DstAcc | SrcNone), I(ImplicitOps | SrcAcc, em_cwd), |
cc4feed5 | 3997 | I(SrcImmFAddr | No64, em_call_far), N, |
62aaa2f0 | 3998 | II(ImplicitOps | Stack, em_pushf, pushf), |
98f73630 PB |
3999 | II(ImplicitOps | Stack, em_popf, popf), |
4000 | I(ImplicitOps, em_sahf), I(ImplicitOps, em_lahf), | |
73fba5f4 | 4001 | /* 0xA0 - 0xA7 */ |
b9eac5f4 | 4002 | I2bv(DstAcc | SrcMem | Mov | MemAbs, em_mov), |
d5ae7ce8 | 4003 | I2bv(DstMem | SrcAcc | Mov | MemAbs | PageTable, em_mov), |
b9eac5f4 | 4004 | I2bv(SrcSI | DstDI | Mov | String, em_mov), |
5aca3722 | 4005 | F2bv(SrcSI | DstDI | String | NoWrite, em_cmp_r), |
73fba5f4 | 4006 | /* 0xA8 - 0xAF */ |
fb864fbc | 4007 | F2bv(DstAcc | SrcImm | NoWrite, em_test), |
b9eac5f4 AK |
4008 | I2bv(SrcAcc | DstDI | Mov | String, em_mov), |
4009 | I2bv(SrcSI | DstAcc | Mov | String, em_mov), | |
5aca3722 | 4010 | F2bv(SrcAcc | DstDI | String | NoWrite, em_cmp_r), |
73fba5f4 | 4011 | /* 0xB0 - 0xB7 */ |
b9eac5f4 | 4012 | X8(I(ByteOp | DstReg | SrcImm | Mov, em_mov)), |
73fba5f4 | 4013 | /* 0xB8 - 0xBF */ |
5e2c6883 | 4014 | X8(I(DstReg | SrcImm64 | Mov, em_mov)), |
73fba5f4 | 4015 | /* 0xC0 - 0xC7 */ |
007a3b54 | 4016 | G(ByteOp | Src2ImmByte, group2), G(Src2ImmByte, group2), |
58b7075d NA |
4017 | I(ImplicitOps | NearBranch | SrcImmU16, em_ret_near_imm), |
4018 | I(ImplicitOps | NearBranch, em_ret), | |
d4b4325f AK |
4019 | I(DstReg | SrcMemFAddr | ModRM | No64 | Src2ES, em_lseg), |
4020 | I(DstReg | SrcMemFAddr | ModRM | No64 | Src2DS, em_lseg), | |
a4d4a7c1 | 4021 | G(ByteOp, group11), G(0, group11), |
73fba5f4 | 4022 | /* 0xC8 - 0xCF */ |
612e89f0 | 4023 | I(Stack | SrcImmU16 | Src2ImmByte, em_enter), I(Stack, em_leave), |
3261107e BR |
4024 | I(ImplicitOps | Stack | SrcImmU16, em_ret_far_imm), |
4025 | I(ImplicitOps | Stack, em_ret_far), | |
3c6e276f | 4026 | D(ImplicitOps), DI(SrcImmByte, intn), |
db5b0762 | 4027 | D(ImplicitOps | No64), II(ImplicitOps, em_iret, iret), |
73fba5f4 | 4028 | /* 0xD0 - 0xD7 */ |
007a3b54 AK |
4029 | G(Src2One | ByteOp, group2), G(Src2One, group2), |
4030 | G(Src2CL | ByteOp, group2), G(Src2CL, group2), | |
a035d5c6 | 4031 | I(DstAcc | SrcImmUByte | No64, em_aam), |
326f578f PB |
4032 | I(DstAcc | SrcImmUByte | No64, em_aad), |
4033 | F(DstAcc | ByteOp | No64, em_salc), | |
7fa57952 | 4034 | I(DstAcc | SrcXLat | ByteOp, em_mov), |
73fba5f4 | 4035 | /* 0xD8 - 0xDF */ |
045a282c | 4036 | N, E(0, &escape_d9), N, E(0, &escape_db), N, E(0, &escape_dd), N, N, |
73fba5f4 | 4037 | /* 0xE0 - 0xE7 */ |
58b7075d NA |
4038 | X3(I(SrcImmByte | NearBranch, em_loop)), |
4039 | I(SrcImmByte | NearBranch, em_jcxz), | |
d7841a4b TY |
4040 | I2bvIP(SrcImmUByte | DstAcc, em_in, in, check_perm_in), |
4041 | I2bvIP(SrcAcc | DstImmUByte, em_out, out, check_perm_out), | |
73fba5f4 | 4042 | /* 0xE8 - 0xEF */ |
58b7075d NA |
4043 | I(SrcImm | NearBranch, em_call), D(SrcImm | ImplicitOps | NearBranch), |
4044 | I(SrcImmFAddr | No64, em_jmp_far), | |
4045 | D(SrcImmByte | ImplicitOps | NearBranch), | |
d7841a4b TY |
4046 | I2bvIP(SrcDX | DstAcc, em_in, in, check_perm_in), |
4047 | I2bvIP(SrcAcc | DstDX, em_out, out, check_perm_out), | |
73fba5f4 | 4048 | /* 0xF0 - 0xF7 */ |
bf608f88 | 4049 | N, DI(ImplicitOps, icebp), N, N, |
3c6e276f AK |
4050 | DI(ImplicitOps | Priv, hlt), D(ImplicitOps), |
4051 | G(ByteOp, group3), G(0, group3), | |
73fba5f4 | 4052 | /* 0xF8 - 0xFF */ |
f411e6cd TY |
4053 | D(ImplicitOps), D(ImplicitOps), |
4054 | I(ImplicitOps, em_cli), I(ImplicitOps, em_sti), | |
73fba5f4 AK |
4055 | D(ImplicitOps), D(ImplicitOps), G(0, group4), G(0, group5), |
4056 | }; | |
4057 | ||
fd0a0d82 | 4058 | static const struct opcode twobyte_table[256] = { |
73fba5f4 | 4059 | /* 0x00 - 0x0F */ |
dee6bb70 | 4060 | G(0, group6), GD(0, &group7), N, N, |
b51e974f | 4061 | N, I(ImplicitOps | EmulateOnUD, em_syscall), |
db5b0762 | 4062 | II(ImplicitOps | Priv, em_clts, clts), N, |
3c6e276f | 4063 | DI(ImplicitOps | Priv, invd), DI(ImplicitOps | Priv, wbinvd), N, N, |
3f6f1480 | 4064 | N, D(ImplicitOps | ModRM | SrcMem | NoAccess), N, N, |
73fba5f4 | 4065 | /* 0x10 - 0x1F */ |
103f98ea | 4066 | N, N, N, N, N, N, N, N, |
3f6f1480 NA |
4067 | D(ImplicitOps | ModRM | SrcMem | NoAccess), |
4068 | N, N, N, N, N, N, D(ImplicitOps | ModRM | SrcMem | NoAccess), | |
73fba5f4 | 4069 | /* 0x20 - 0x2F */ |
9b88ae99 NA |
4070 | DIP(ModRM | DstMem | Priv | Op3264 | NoMod, cr_read, check_cr_read), |
4071 | DIP(ModRM | DstMem | Priv | Op3264 | NoMod, dr_read, check_dr_read), | |
4072 | IIP(ModRM | SrcMem | Priv | Op3264 | NoMod, em_cr_write, cr_write, | |
4073 | check_cr_write), | |
4074 | IIP(ModRM | SrcMem | Priv | Op3264 | NoMod, em_dr_write, dr_write, | |
4075 | check_dr_write), | |
73fba5f4 | 4076 | N, N, N, N, |
27ce8258 IM |
4077 | GP(ModRM | DstReg | SrcMem | Mov | Sse, &pfx_0f_28_0f_29), |
4078 | GP(ModRM | DstMem | SrcReg | Mov | Sse, &pfx_0f_28_0f_29), | |
d5b77069 | 4079 | N, GP(ModRM | DstMem | SrcReg | Mov | Sse, &pfx_0f_2b), |
3e114eb4 | 4080 | N, N, N, N, |
73fba5f4 | 4081 | /* 0x30 - 0x3F */ |
e1e210b0 | 4082 | II(ImplicitOps | Priv, em_wrmsr, wrmsr), |
8061252e | 4083 | IIP(ImplicitOps, em_rdtsc, rdtsc, check_rdtsc), |
e1e210b0 | 4084 | II(ImplicitOps | Priv, em_rdmsr, rdmsr), |
222d21aa | 4085 | IIP(ImplicitOps, em_rdpmc, rdpmc, check_rdpmc), |
b51e974f BP |
4086 | I(ImplicitOps | EmulateOnUD, em_sysenter), |
4087 | I(ImplicitOps | Priv | EmulateOnUD, em_sysexit), | |
d867162c | 4088 | N, N, |
73fba5f4 AK |
4089 | N, N, N, N, N, N, N, N, |
4090 | /* 0x40 - 0x4F */ | |
140bad89 | 4091 | X16(D(DstReg | SrcMem | ModRM)), |
73fba5f4 AK |
4092 | /* 0x50 - 0x5F */ |
4093 | N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, | |
4094 | /* 0x60 - 0x6F */ | |
aa97bb48 AK |
4095 | N, N, N, N, |
4096 | N, N, N, N, | |
4097 | N, N, N, N, | |
4098 | N, N, N, GP(SrcMem | DstReg | ModRM | Mov, &pfx_0f_6f_0f_7f), | |
73fba5f4 | 4099 | /* 0x70 - 0x7F */ |
aa97bb48 AK |
4100 | N, N, N, N, |
4101 | N, N, N, N, | |
4102 | N, N, N, N, | |
4103 | N, N, N, GP(SrcReg | DstMem | ModRM | Mov, &pfx_0f_6f_0f_7f), | |
73fba5f4 | 4104 | /* 0x80 - 0x8F */ |
58b7075d | 4105 | X16(D(SrcImm | NearBranch)), |
73fba5f4 | 4106 | /* 0x90 - 0x9F */ |
ee45b58e | 4107 | X16(D(ByteOp | DstMem | SrcNone | ModRM| Mov)), |
73fba5f4 | 4108 | /* 0xA0 - 0xA7 */ |
1cd196ea | 4109 | I(Stack | Src2FS, em_push_sreg), I(Stack | Src2FS, em_pop_sreg), |
11c363ba AK |
4110 | II(ImplicitOps, em_cpuid, cpuid), |
4111 | F(DstMem | SrcReg | ModRM | BitOp | NoWrite, em_bt), | |
0bdea068 AK |
4112 | F(DstMem | SrcReg | Src2ImmByte | ModRM, em_shld), |
4113 | F(DstMem | SrcReg | Src2CL | ModRM, em_shld), N, N, | |
73fba5f4 | 4114 | /* 0xA8 - 0xAF */ |
1cd196ea | 4115 | I(Stack | Src2GS, em_push_sreg), I(Stack | Src2GS, em_pop_sreg), |
d5ae7ce8 | 4116 | DI(ImplicitOps, rsm), |
11c363ba | 4117 | F(DstMem | SrcReg | ModRM | BitOp | Lock | PageTable, em_bts), |
0bdea068 AK |
4118 | F(DstMem | SrcReg | Src2ImmByte | ModRM, em_shrd), |
4119 | F(DstMem | SrcReg | Src2CL | ModRM, em_shrd), | |
13e457e0 | 4120 | GD(0, &group15), F(DstReg | SrcMem | ModRM, em_imul), |
73fba5f4 | 4121 | /* 0xB0 - 0xB7 */ |
e940b5c2 | 4122 | I2bv(DstMem | SrcReg | ModRM | Lock | PageTable, em_cmpxchg), |
d4b4325f | 4123 | I(DstReg | SrcMemFAddr | ModRM | Src2SS, em_lseg), |
11c363ba | 4124 | F(DstMem | SrcReg | ModRM | BitOp | Lock, em_btr), |
d4b4325f AK |
4125 | I(DstReg | SrcMemFAddr | ModRM | Src2FS, em_lseg), |
4126 | I(DstReg | SrcMemFAddr | ModRM | Src2GS, em_lseg), | |
2adb5ad9 | 4127 | D(DstReg | SrcMem8 | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov), |
73fba5f4 AK |
4128 | /* 0xB8 - 0xBF */ |
4129 | N, N, | |
ce7faab2 | 4130 | G(BitOp, group8), |
11c363ba AK |
4131 | F(DstMem | SrcReg | ModRM | BitOp | Lock | PageTable, em_btc), |
4132 | F(DstReg | SrcMem | ModRM, em_bsf), F(DstReg | SrcMem | ModRM, em_bsr), | |
2adb5ad9 | 4133 | D(DstReg | SrcMem8 | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov), |
9299836e | 4134 | /* 0xC0 - 0xC7 */ |
e47a5f5f | 4135 | F2bv(DstMem | SrcReg | ModRM | SrcWrite | Lock, em_xadd), |
39f062ff | 4136 | N, ID(0, &instr_dual_0f_c3), |
73fba5f4 | 4137 | N, N, N, GD(0, &group9), |
9299836e AK |
4138 | /* 0xC8 - 0xCF */ |
4139 | X8(I(DstReg, em_bswap)), | |
73fba5f4 AK |
4140 | /* 0xD0 - 0xDF */ |
4141 | N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, | |
4142 | /* 0xE0 - 0xEF */ | |
0a37027e AW |
4143 | N, N, N, N, N, N, N, GP(SrcReg | DstMem | ModRM | Mov, &pfx_0f_e7), |
4144 | N, N, N, N, N, N, N, N, | |
73fba5f4 AK |
4145 | /* 0xF0 - 0xFF */ |
4146 | N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N | |
4147 | }; | |
4148 | ||
39f062ff NA |
4149 | static const struct instr_dual instr_dual_0f_38_f0 = { |
4150 | I(DstReg | SrcMem | Mov, em_movbe), N | |
4151 | }; | |
4152 | ||
4153 | static const struct instr_dual instr_dual_0f_38_f1 = { | |
4154 | I(DstMem | SrcReg | Mov, em_movbe), N | |
4155 | }; | |
4156 | ||
0bc5eedb | 4157 | static const struct gprefix three_byte_0f_38_f0 = { |
39f062ff | 4158 | ID(0, &instr_dual_0f_38_f0), N, N, N |
0bc5eedb BP |
4159 | }; |
4160 | ||
4161 | static const struct gprefix three_byte_0f_38_f1 = { | |
39f062ff | 4162 | ID(0, &instr_dual_0f_38_f1), N, N, N |
0bc5eedb BP |
4163 | }; |
4164 | ||
4165 | /* | |
4166 | * Insns below are selected by the prefix which indexed by the third opcode | |
4167 | * byte. | |
4168 | */ | |
4169 | static const struct opcode opcode_map_0f_38[256] = { | |
4170 | /* 0x00 - 0x7f */ | |
4171 | X16(N), X16(N), X16(N), X16(N), X16(N), X16(N), X16(N), X16(N), | |
84cffe49 BP |
4172 | /* 0x80 - 0xef */ |
4173 | X16(N), X16(N), X16(N), X16(N), X16(N), X16(N), X16(N), | |
4174 | /* 0xf0 - 0xf1 */ | |
4175 | GP(EmulateOnUD | ModRM | Prefix, &three_byte_0f_38_f0), | |
4176 | GP(EmulateOnUD | ModRM | Prefix, &three_byte_0f_38_f1), | |
4177 | /* 0xf2 - 0xff */ | |
4178 | N, N, X4(N), X8(N) | |
0bc5eedb BP |
4179 | }; |
4180 | ||
73fba5f4 AK |
4181 | #undef D |
4182 | #undef N | |
4183 | #undef G | |
4184 | #undef GD | |
4185 | #undef I | |
aa97bb48 | 4186 | #undef GP |
01de8b09 | 4187 | #undef EXT |
73fba5f4 | 4188 | |
8d8f4e9f | 4189 | #undef D2bv |
f6511935 | 4190 | #undef D2bvIP |
8d8f4e9f | 4191 | #undef I2bv |
d7841a4b | 4192 | #undef I2bvIP |
d67fc27a | 4193 | #undef I6ALU |
8d8f4e9f | 4194 | |
9dac77fa | 4195 | static unsigned imm_size(struct x86_emulate_ctxt *ctxt) |
39f21ee5 AK |
4196 | { |
4197 | unsigned size; | |
4198 | ||
9dac77fa | 4199 | size = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; |
39f21ee5 AK |
4200 | if (size == 8) |
4201 | size = 4; | |
4202 | return size; | |
4203 | } | |
4204 | ||
4205 | static int decode_imm(struct x86_emulate_ctxt *ctxt, struct operand *op, | |
4206 | unsigned size, bool sign_extension) | |
4207 | { | |
39f21ee5 AK |
4208 | int rc = X86EMUL_CONTINUE; |
4209 | ||
4210 | op->type = OP_IMM; | |
4211 | op->bytes = size; | |
9dac77fa | 4212 | op->addr.mem.ea = ctxt->_eip; |
39f21ee5 AK |
4213 | /* NB. Immediates are sign-extended as necessary. */ |
4214 | switch (op->bytes) { | |
4215 | case 1: | |
e85a1085 | 4216 | op->val = insn_fetch(s8, ctxt); |
39f21ee5 AK |
4217 | break; |
4218 | case 2: | |
e85a1085 | 4219 | op->val = insn_fetch(s16, ctxt); |
39f21ee5 AK |
4220 | break; |
4221 | case 4: | |
e85a1085 | 4222 | op->val = insn_fetch(s32, ctxt); |
39f21ee5 | 4223 | break; |
5e2c6883 NA |
4224 | case 8: |
4225 | op->val = insn_fetch(s64, ctxt); | |
4226 | break; | |
39f21ee5 AK |
4227 | } |
4228 | if (!sign_extension) { | |
4229 | switch (op->bytes) { | |
4230 | case 1: | |
4231 | op->val &= 0xff; | |
4232 | break; | |
4233 | case 2: | |
4234 | op->val &= 0xffff; | |
4235 | break; | |
4236 | case 4: | |
4237 | op->val &= 0xffffffff; | |
4238 | break; | |
4239 | } | |
4240 | } | |
4241 | done: | |
4242 | return rc; | |
4243 | } | |
4244 | ||
a9945549 AK |
4245 | static int decode_operand(struct x86_emulate_ctxt *ctxt, struct operand *op, |
4246 | unsigned d) | |
4247 | { | |
4248 | int rc = X86EMUL_CONTINUE; | |
4249 | ||
4250 | switch (d) { | |
4251 | case OpReg: | |
2adb5ad9 | 4252 | decode_register_operand(ctxt, op); |
a9945549 AK |
4253 | break; |
4254 | case OpImmUByte: | |
608aabe3 | 4255 | rc = decode_imm(ctxt, op, 1, false); |
a9945549 AK |
4256 | break; |
4257 | case OpMem: | |
41ddf978 | 4258 | ctxt->memop.bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; |
0fe59128 AK |
4259 | mem_common: |
4260 | *op = ctxt->memop; | |
4261 | ctxt->memopp = op; | |
96888977 | 4262 | if (ctxt->d & BitOp) |
a9945549 AK |
4263 | fetch_bit_operand(ctxt); |
4264 | op->orig_val = op->val; | |
4265 | break; | |
41ddf978 | 4266 | case OpMem64: |
aaa05f24 | 4267 | ctxt->memop.bytes = (ctxt->op_bytes == 8) ? 16 : 8; |
41ddf978 | 4268 | goto mem_common; |
a9945549 AK |
4269 | case OpAcc: |
4270 | op->type = OP_REG; | |
4271 | op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; | |
dd856efa | 4272 | op->addr.reg = reg_rmw(ctxt, VCPU_REGS_RAX); |
a9945549 AK |
4273 | fetch_register_operand(op); |
4274 | op->orig_val = op->val; | |
4275 | break; | |
820207c8 AK |
4276 | case OpAccLo: |
4277 | op->type = OP_REG; | |
4278 | op->bytes = (ctxt->d & ByteOp) ? 2 : ctxt->op_bytes; | |
4279 | op->addr.reg = reg_rmw(ctxt, VCPU_REGS_RAX); | |
4280 | fetch_register_operand(op); | |
4281 | op->orig_val = op->val; | |
4282 | break; | |
4283 | case OpAccHi: | |
4284 | if (ctxt->d & ByteOp) { | |
4285 | op->type = OP_NONE; | |
4286 | break; | |
4287 | } | |
4288 | op->type = OP_REG; | |
4289 | op->bytes = ctxt->op_bytes; | |
4290 | op->addr.reg = reg_rmw(ctxt, VCPU_REGS_RDX); | |
4291 | fetch_register_operand(op); | |
4292 | op->orig_val = op->val; | |
4293 | break; | |
a9945549 AK |
4294 | case OpDI: |
4295 | op->type = OP_MEM; | |
4296 | op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; | |
4297 | op->addr.mem.ea = | |
01485a22 | 4298 | register_address(ctxt, VCPU_REGS_RDI); |
a9945549 AK |
4299 | op->addr.mem.seg = VCPU_SREG_ES; |
4300 | op->val = 0; | |
b3356bf0 | 4301 | op->count = 1; |
a9945549 AK |
4302 | break; |
4303 | case OpDX: | |
4304 | op->type = OP_REG; | |
4305 | op->bytes = 2; | |
dd856efa | 4306 | op->addr.reg = reg_rmw(ctxt, VCPU_REGS_RDX); |
a9945549 AK |
4307 | fetch_register_operand(op); |
4308 | break; | |
4dd6a57d AK |
4309 | case OpCL: |
4310 | op->bytes = 1; | |
dd856efa | 4311 | op->val = reg_read(ctxt, VCPU_REGS_RCX) & 0xff; |
4dd6a57d AK |
4312 | break; |
4313 | case OpImmByte: | |
4314 | rc = decode_imm(ctxt, op, 1, true); | |
4315 | break; | |
4316 | case OpOne: | |
4317 | op->bytes = 1; | |
4318 | op->val = 1; | |
4319 | break; | |
4320 | case OpImm: | |
4321 | rc = decode_imm(ctxt, op, imm_size(ctxt), true); | |
4322 | break; | |
5e2c6883 NA |
4323 | case OpImm64: |
4324 | rc = decode_imm(ctxt, op, ctxt->op_bytes, true); | |
4325 | break; | |
28867cee AK |
4326 | case OpMem8: |
4327 | ctxt->memop.bytes = 1; | |
660696d1 | 4328 | if (ctxt->memop.type == OP_REG) { |
aa9ac1a6 GN |
4329 | ctxt->memop.addr.reg = decode_register(ctxt, |
4330 | ctxt->modrm_rm, true); | |
660696d1 GN |
4331 | fetch_register_operand(&ctxt->memop); |
4332 | } | |
28867cee | 4333 | goto mem_common; |
0fe59128 AK |
4334 | case OpMem16: |
4335 | ctxt->memop.bytes = 2; | |
4336 | goto mem_common; | |
4337 | case OpMem32: | |
4338 | ctxt->memop.bytes = 4; | |
4339 | goto mem_common; | |
4340 | case OpImmU16: | |
4341 | rc = decode_imm(ctxt, op, 2, false); | |
4342 | break; | |
4343 | case OpImmU: | |
4344 | rc = decode_imm(ctxt, op, imm_size(ctxt), false); | |
4345 | break; | |
4346 | case OpSI: | |
4347 | op->type = OP_MEM; | |
4348 | op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; | |
4349 | op->addr.mem.ea = | |
01485a22 | 4350 | register_address(ctxt, VCPU_REGS_RSI); |
573e80fe | 4351 | op->addr.mem.seg = ctxt->seg_override; |
0fe59128 | 4352 | op->val = 0; |
b3356bf0 | 4353 | op->count = 1; |
0fe59128 | 4354 | break; |
7fa57952 PB |
4355 | case OpXLat: |
4356 | op->type = OP_MEM; | |
4357 | op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; | |
4358 | op->addr.mem.ea = | |
01485a22 | 4359 | address_mask(ctxt, |
7fa57952 PB |
4360 | reg_read(ctxt, VCPU_REGS_RBX) + |
4361 | (reg_read(ctxt, VCPU_REGS_RAX) & 0xff)); | |
573e80fe | 4362 | op->addr.mem.seg = ctxt->seg_override; |
7fa57952 PB |
4363 | op->val = 0; |
4364 | break; | |
0fe59128 AK |
4365 | case OpImmFAddr: |
4366 | op->type = OP_IMM; | |
4367 | op->addr.mem.ea = ctxt->_eip; | |
4368 | op->bytes = ctxt->op_bytes + 2; | |
4369 | insn_fetch_arr(op->valptr, op->bytes, ctxt); | |
4370 | break; | |
4371 | case OpMemFAddr: | |
4372 | ctxt->memop.bytes = ctxt->op_bytes + 2; | |
4373 | goto mem_common; | |
c191a7a0 AK |
4374 | case OpES: |
4375 | op->val = VCPU_SREG_ES; | |
4376 | break; | |
4377 | case OpCS: | |
4378 | op->val = VCPU_SREG_CS; | |
4379 | break; | |
4380 | case OpSS: | |
4381 | op->val = VCPU_SREG_SS; | |
4382 | break; | |
4383 | case OpDS: | |
4384 | op->val = VCPU_SREG_DS; | |
4385 | break; | |
4386 | case OpFS: | |
4387 | op->val = VCPU_SREG_FS; | |
4388 | break; | |
4389 | case OpGS: | |
4390 | op->val = VCPU_SREG_GS; | |
4391 | break; | |
a9945549 AK |
4392 | case OpImplicit: |
4393 | /* Special instructions do their own operand decoding. */ | |
4394 | default: | |
4395 | op->type = OP_NONE; /* Disable writeback. */ | |
4396 | break; | |
4397 | } | |
4398 | ||
4399 | done: | |
4400 | return rc; | |
4401 | } | |
4402 | ||
ef5d75cc | 4403 | int x86_decode_insn(struct x86_emulate_ctxt *ctxt, void *insn, int insn_len) |
dde7e6d1 | 4404 | { |
dde7e6d1 AK |
4405 | int rc = X86EMUL_CONTINUE; |
4406 | int mode = ctxt->mode; | |
46561646 | 4407 | int def_op_bytes, def_ad_bytes, goffset, simd_prefix; |
0d7cdee8 | 4408 | bool op_prefix = false; |
573e80fe | 4409 | bool has_seg_override = false; |
46561646 | 4410 | struct opcode opcode; |
dde7e6d1 | 4411 | |
f09ed83e AK |
4412 | ctxt->memop.type = OP_NONE; |
4413 | ctxt->memopp = NULL; | |
9dac77fa | 4414 | ctxt->_eip = ctxt->eip; |
17052f16 PB |
4415 | ctxt->fetch.ptr = ctxt->fetch.data; |
4416 | ctxt->fetch.end = ctxt->fetch.data + insn_len; | |
1ce19dc1 | 4417 | ctxt->opcode_len = 1; |
dc25e89e | 4418 | if (insn_len > 0) |
9dac77fa | 4419 | memcpy(ctxt->fetch.data, insn, insn_len); |
285ca9e9 | 4420 | else { |
9506d57d | 4421 | rc = __do_insn_fetch_bytes(ctxt, 1); |
285ca9e9 PB |
4422 | if (rc != X86EMUL_CONTINUE) |
4423 | return rc; | |
4424 | } | |
dde7e6d1 AK |
4425 | |
4426 | switch (mode) { | |
4427 | case X86EMUL_MODE_REAL: | |
4428 | case X86EMUL_MODE_VM86: | |
4429 | case X86EMUL_MODE_PROT16: | |
4430 | def_op_bytes = def_ad_bytes = 2; | |
4431 | break; | |
4432 | case X86EMUL_MODE_PROT32: | |
4433 | def_op_bytes = def_ad_bytes = 4; | |
4434 | break; | |
4435 | #ifdef CONFIG_X86_64 | |
4436 | case X86EMUL_MODE_PROT64: | |
4437 | def_op_bytes = 4; | |
4438 | def_ad_bytes = 8; | |
4439 | break; | |
4440 | #endif | |
4441 | default: | |
1d2887e2 | 4442 | return EMULATION_FAILED; |
dde7e6d1 AK |
4443 | } |
4444 | ||
9dac77fa AK |
4445 | ctxt->op_bytes = def_op_bytes; |
4446 | ctxt->ad_bytes = def_ad_bytes; | |
dde7e6d1 AK |
4447 | |
4448 | /* Legacy prefixes. */ | |
4449 | for (;;) { | |
e85a1085 | 4450 | switch (ctxt->b = insn_fetch(u8, ctxt)) { |
dde7e6d1 | 4451 | case 0x66: /* operand-size override */ |
0d7cdee8 | 4452 | op_prefix = true; |
dde7e6d1 | 4453 | /* switch between 2/4 bytes */ |
9dac77fa | 4454 | ctxt->op_bytes = def_op_bytes ^ 6; |
dde7e6d1 AK |
4455 | break; |
4456 | case 0x67: /* address-size override */ | |
4457 | if (mode == X86EMUL_MODE_PROT64) | |
4458 | /* switch between 4/8 bytes */ | |
9dac77fa | 4459 | ctxt->ad_bytes = def_ad_bytes ^ 12; |
dde7e6d1 AK |
4460 | else |
4461 | /* switch between 2/4 bytes */ | |
9dac77fa | 4462 | ctxt->ad_bytes = def_ad_bytes ^ 6; |
dde7e6d1 AK |
4463 | break; |
4464 | case 0x26: /* ES override */ | |
4465 | case 0x2e: /* CS override */ | |
4466 | case 0x36: /* SS override */ | |
4467 | case 0x3e: /* DS override */ | |
573e80fe BD |
4468 | has_seg_override = true; |
4469 | ctxt->seg_override = (ctxt->b >> 3) & 3; | |
dde7e6d1 AK |
4470 | break; |
4471 | case 0x64: /* FS override */ | |
4472 | case 0x65: /* GS override */ | |
573e80fe BD |
4473 | has_seg_override = true; |
4474 | ctxt->seg_override = ctxt->b & 7; | |
dde7e6d1 AK |
4475 | break; |
4476 | case 0x40 ... 0x4f: /* REX */ | |
4477 | if (mode != X86EMUL_MODE_PROT64) | |
4478 | goto done_prefixes; | |
9dac77fa | 4479 | ctxt->rex_prefix = ctxt->b; |
dde7e6d1 AK |
4480 | continue; |
4481 | case 0xf0: /* LOCK */ | |
9dac77fa | 4482 | ctxt->lock_prefix = 1; |
dde7e6d1 AK |
4483 | break; |
4484 | case 0xf2: /* REPNE/REPNZ */ | |
dde7e6d1 | 4485 | case 0xf3: /* REP/REPE/REPZ */ |
9dac77fa | 4486 | ctxt->rep_prefix = ctxt->b; |
dde7e6d1 AK |
4487 | break; |
4488 | default: | |
4489 | goto done_prefixes; | |
4490 | } | |
4491 | ||
4492 | /* Any legacy prefix after a REX prefix nullifies its effect. */ | |
4493 | ||
9dac77fa | 4494 | ctxt->rex_prefix = 0; |
dde7e6d1 AK |
4495 | } |
4496 | ||
4497 | done_prefixes: | |
4498 | ||
4499 | /* REX prefix. */ | |
9dac77fa AK |
4500 | if (ctxt->rex_prefix & 8) |
4501 | ctxt->op_bytes = 8; /* REX.W */ | |
dde7e6d1 AK |
4502 | |
4503 | /* Opcode byte(s). */ | |
9dac77fa | 4504 | opcode = opcode_table[ctxt->b]; |
d3ad6243 | 4505 | /* Two-byte opcode? */ |
9dac77fa | 4506 | if (ctxt->b == 0x0f) { |
1ce19dc1 | 4507 | ctxt->opcode_len = 2; |
e85a1085 | 4508 | ctxt->b = insn_fetch(u8, ctxt); |
9dac77fa | 4509 | opcode = twobyte_table[ctxt->b]; |
0bc5eedb BP |
4510 | |
4511 | /* 0F_38 opcode map */ | |
4512 | if (ctxt->b == 0x38) { | |
4513 | ctxt->opcode_len = 3; | |
4514 | ctxt->b = insn_fetch(u8, ctxt); | |
4515 | opcode = opcode_map_0f_38[ctxt->b]; | |
4516 | } | |
dde7e6d1 | 4517 | } |
9dac77fa | 4518 | ctxt->d = opcode.flags; |
dde7e6d1 | 4519 | |
9f4260e7 TY |
4520 | if (ctxt->d & ModRM) |
4521 | ctxt->modrm = insn_fetch(u8, ctxt); | |
4522 | ||
7fe864dc NA |
4523 | /* vex-prefix instructions are not implemented */ |
4524 | if (ctxt->opcode_len == 1 && (ctxt->b == 0xc5 || ctxt->b == 0xc4) && | |
d14cb5df | 4525 | (mode == X86EMUL_MODE_PROT64 || (ctxt->modrm & 0xc0) == 0xc0)) { |
7fe864dc NA |
4526 | ctxt->d = NotImpl; |
4527 | } | |
4528 | ||
9dac77fa AK |
4529 | while (ctxt->d & GroupMask) { |
4530 | switch (ctxt->d & GroupMask) { | |
46561646 | 4531 | case Group: |
9dac77fa | 4532 | goffset = (ctxt->modrm >> 3) & 7; |
46561646 AK |
4533 | opcode = opcode.u.group[goffset]; |
4534 | break; | |
4535 | case GroupDual: | |
9dac77fa AK |
4536 | goffset = (ctxt->modrm >> 3) & 7; |
4537 | if ((ctxt->modrm >> 6) == 3) | |
46561646 AK |
4538 | opcode = opcode.u.gdual->mod3[goffset]; |
4539 | else | |
4540 | opcode = opcode.u.gdual->mod012[goffset]; | |
4541 | break; | |
4542 | case RMExt: | |
9dac77fa | 4543 | goffset = ctxt->modrm & 7; |
01de8b09 | 4544 | opcode = opcode.u.group[goffset]; |
46561646 AK |
4545 | break; |
4546 | case Prefix: | |
9dac77fa | 4547 | if (ctxt->rep_prefix && op_prefix) |
1d2887e2 | 4548 | return EMULATION_FAILED; |
9dac77fa | 4549 | simd_prefix = op_prefix ? 0x66 : ctxt->rep_prefix; |
46561646 AK |
4550 | switch (simd_prefix) { |
4551 | case 0x00: opcode = opcode.u.gprefix->pfx_no; break; | |
4552 | case 0x66: opcode = opcode.u.gprefix->pfx_66; break; | |
4553 | case 0xf2: opcode = opcode.u.gprefix->pfx_f2; break; | |
4554 | case 0xf3: opcode = opcode.u.gprefix->pfx_f3; break; | |
4555 | } | |
4556 | break; | |
045a282c GN |
4557 | case Escape: |
4558 | if (ctxt->modrm > 0xbf) | |
4559 | opcode = opcode.u.esc->high[ctxt->modrm - 0xc0]; | |
4560 | else | |
4561 | opcode = opcode.u.esc->op[(ctxt->modrm >> 3) & 7]; | |
4562 | break; | |
39f062ff NA |
4563 | case InstrDual: |
4564 | if ((ctxt->modrm >> 6) == 3) | |
4565 | opcode = opcode.u.idual->mod3; | |
4566 | else | |
4567 | opcode = opcode.u.idual->mod012; | |
4568 | break; | |
46561646 | 4569 | default: |
1d2887e2 | 4570 | return EMULATION_FAILED; |
0d7cdee8 | 4571 | } |
46561646 | 4572 | |
b1ea50b2 | 4573 | ctxt->d &= ~(u64)GroupMask; |
9dac77fa | 4574 | ctxt->d |= opcode.flags; |
0d7cdee8 AK |
4575 | } |
4576 | ||
e24186e0 PB |
4577 | /* Unrecognised? */ |
4578 | if (ctxt->d == 0) | |
4579 | return EMULATION_FAILED; | |
4580 | ||
9dac77fa | 4581 | ctxt->execute = opcode.u.execute; |
dde7e6d1 | 4582 | |
3a6095a0 NA |
4583 | if (unlikely(ctxt->ud) && likely(!(ctxt->d & EmulateOnUD))) |
4584 | return EMULATION_FAILED; | |
4585 | ||
d40a6898 | 4586 | if (unlikely(ctxt->d & |
ed9aad21 NA |
4587 | (NotImpl|Stack|Op3264|Sse|Mmx|Intercept|CheckPerm|NearBranch| |
4588 | No16))) { | |
d40a6898 PB |
4589 | /* |
4590 | * These are copied unconditionally here, and checked unconditionally | |
4591 | * in x86_emulate_insn. | |
4592 | */ | |
4593 | ctxt->check_perm = opcode.check_perm; | |
4594 | ctxt->intercept = opcode.intercept; | |
dde7e6d1 | 4595 | |
d40a6898 PB |
4596 | if (ctxt->d & NotImpl) |
4597 | return EMULATION_FAILED; | |
d867162c | 4598 | |
58b7075d NA |
4599 | if (mode == X86EMUL_MODE_PROT64) { |
4600 | if (ctxt->op_bytes == 4 && (ctxt->d & Stack)) | |
4601 | ctxt->op_bytes = 8; | |
4602 | else if (ctxt->d & NearBranch) | |
4603 | ctxt->op_bytes = 8; | |
4604 | } | |
7f9b4b75 | 4605 | |
d40a6898 PB |
4606 | if (ctxt->d & Op3264) { |
4607 | if (mode == X86EMUL_MODE_PROT64) | |
4608 | ctxt->op_bytes = 8; | |
4609 | else | |
4610 | ctxt->op_bytes = 4; | |
4611 | } | |
4612 | ||
ed9aad21 NA |
4613 | if ((ctxt->d & No16) && ctxt->op_bytes == 2) |
4614 | ctxt->op_bytes = 4; | |
4615 | ||
d40a6898 PB |
4616 | if (ctxt->d & Sse) |
4617 | ctxt->op_bytes = 16; | |
4618 | else if (ctxt->d & Mmx) | |
4619 | ctxt->op_bytes = 8; | |
4620 | } | |
1253791d | 4621 | |
dde7e6d1 | 4622 | /* ModRM and SIB bytes. */ |
9dac77fa | 4623 | if (ctxt->d & ModRM) { |
f09ed83e | 4624 | rc = decode_modrm(ctxt, &ctxt->memop); |
573e80fe BD |
4625 | if (!has_seg_override) { |
4626 | has_seg_override = true; | |
4627 | ctxt->seg_override = ctxt->modrm_seg; | |
4628 | } | |
9dac77fa | 4629 | } else if (ctxt->d & MemAbs) |
f09ed83e | 4630 | rc = decode_abs(ctxt, &ctxt->memop); |
dde7e6d1 AK |
4631 | if (rc != X86EMUL_CONTINUE) |
4632 | goto done; | |
4633 | ||
573e80fe BD |
4634 | if (!has_seg_override) |
4635 | ctxt->seg_override = VCPU_SREG_DS; | |
dde7e6d1 | 4636 | |
573e80fe | 4637 | ctxt->memop.addr.mem.seg = ctxt->seg_override; |
dde7e6d1 | 4638 | |
dde7e6d1 AK |
4639 | /* |
4640 | * Decode and fetch the source operand: register, memory | |
4641 | * or immediate. | |
4642 | */ | |
0fe59128 | 4643 | rc = decode_operand(ctxt, &ctxt->src, (ctxt->d >> SrcShift) & OpMask); |
39f21ee5 AK |
4644 | if (rc != X86EMUL_CONTINUE) |
4645 | goto done; | |
4646 | ||
dde7e6d1 AK |
4647 | /* |
4648 | * Decode and fetch the second source operand: register, memory | |
4649 | * or immediate. | |
4650 | */ | |
4dd6a57d | 4651 | rc = decode_operand(ctxt, &ctxt->src2, (ctxt->d >> Src2Shift) & OpMask); |
39f21ee5 AK |
4652 | if (rc != X86EMUL_CONTINUE) |
4653 | goto done; | |
4654 | ||
dde7e6d1 | 4655 | /* Decode and fetch the destination operand: register or memory. */ |
a9945549 | 4656 | rc = decode_operand(ctxt, &ctxt->dst, (ctxt->d >> DstShift) & OpMask); |
dde7e6d1 | 4657 | |
41061cdb | 4658 | if (ctxt->rip_relative) |
1c1c35ae NA |
4659 | ctxt->memopp->addr.mem.ea = address_mask(ctxt, |
4660 | ctxt->memopp->addr.mem.ea + ctxt->_eip); | |
cb16c348 | 4661 | |
a430c916 | 4662 | done: |
1d2887e2 | 4663 | return (rc != X86EMUL_CONTINUE) ? EMULATION_FAILED : EMULATION_OK; |
dde7e6d1 AK |
4664 | } |
4665 | ||
1cb3f3ae XG |
4666 | bool x86_page_table_writing_insn(struct x86_emulate_ctxt *ctxt) |
4667 | { | |
4668 | return ctxt->d & PageTable; | |
4669 | } | |
4670 | ||
3e2f65d5 GN |
4671 | static bool string_insn_completed(struct x86_emulate_ctxt *ctxt) |
4672 | { | |
3e2f65d5 GN |
4673 | /* The second termination condition only applies for REPE |
4674 | * and REPNE. Test if the repeat string operation prefix is | |
4675 | * REPE/REPZ or REPNE/REPNZ and if it's the case it tests the | |
4676 | * corresponding termination condition according to: | |
4677 | * - if REPE/REPZ and ZF = 0 then done | |
4678 | * - if REPNE/REPNZ and ZF = 1 then done | |
4679 | */ | |
9dac77fa AK |
4680 | if (((ctxt->b == 0xa6) || (ctxt->b == 0xa7) || |
4681 | (ctxt->b == 0xae) || (ctxt->b == 0xaf)) | |
4682 | && (((ctxt->rep_prefix == REPE_PREFIX) && | |
3e2f65d5 | 4683 | ((ctxt->eflags & EFLG_ZF) == 0)) |
9dac77fa | 4684 | || ((ctxt->rep_prefix == REPNE_PREFIX) && |
3e2f65d5 GN |
4685 | ((ctxt->eflags & EFLG_ZF) == EFLG_ZF)))) |
4686 | return true; | |
4687 | ||
4688 | return false; | |
4689 | } | |
4690 | ||
cbe2c9d3 AK |
4691 | static int flush_pending_x87_faults(struct x86_emulate_ctxt *ctxt) |
4692 | { | |
4693 | bool fault = false; | |
4694 | ||
4695 | ctxt->ops->get_fpu(ctxt); | |
4696 | asm volatile("1: fwait \n\t" | |
4697 | "2: \n\t" | |
4698 | ".pushsection .fixup,\"ax\" \n\t" | |
4699 | "3: \n\t" | |
4700 | "movb $1, %[fault] \n\t" | |
4701 | "jmp 2b \n\t" | |
4702 | ".popsection \n\t" | |
4703 | _ASM_EXTABLE(1b, 3b) | |
38e8a2dd | 4704 | : [fault]"+qm"(fault)); |
cbe2c9d3 AK |
4705 | ctxt->ops->put_fpu(ctxt); |
4706 | ||
4707 | if (unlikely(fault)) | |
4708 | return emulate_exception(ctxt, MF_VECTOR, 0, false); | |
4709 | ||
4710 | return X86EMUL_CONTINUE; | |
4711 | } | |
4712 | ||
4713 | static void fetch_possible_mmx_operand(struct x86_emulate_ctxt *ctxt, | |
4714 | struct operand *op) | |
4715 | { | |
4716 | if (op->type == OP_MM) | |
4717 | read_mmx_reg(ctxt, &op->mm_val, op->addr.mm); | |
4718 | } | |
4719 | ||
e28bbd44 AK |
4720 | static int fastop(struct x86_emulate_ctxt *ctxt, void (*fop)(struct fastop *)) |
4721 | { | |
4722 | ulong flags = (ctxt->eflags & EFLAGS_MASK) | X86_EFLAGS_IF; | |
b9fa409b AK |
4723 | if (!(ctxt->d & ByteOp)) |
4724 | fop += __ffs(ctxt->dst.bytes) * FASTOP_SIZE; | |
e28bbd44 | 4725 | asm("push %[flags]; popf; call *%[fastop]; pushf; pop %[flags]\n" |
b8c0b6ae AK |
4726 | : "+a"(ctxt->dst.val), "+d"(ctxt->src.val), [flags]"+D"(flags), |
4727 | [fastop]"+S"(fop) | |
4728 | : "c"(ctxt->src2.val)); | |
e28bbd44 | 4729 | ctxt->eflags = (ctxt->eflags & ~EFLAGS_MASK) | (flags & EFLAGS_MASK); |
b8c0b6ae AK |
4730 | if (!fop) /* exception is returned in fop variable */ |
4731 | return emulate_de(ctxt); | |
e28bbd44 AK |
4732 | return X86EMUL_CONTINUE; |
4733 | } | |
dd856efa | 4734 | |
1498507a BD |
4735 | void init_decode_cache(struct x86_emulate_ctxt *ctxt) |
4736 | { | |
573e80fe BD |
4737 | memset(&ctxt->rip_relative, 0, |
4738 | (void *)&ctxt->modrm - (void *)&ctxt->rip_relative); | |
1498507a | 4739 | |
1498507a BD |
4740 | ctxt->io_read.pos = 0; |
4741 | ctxt->io_read.end = 0; | |
1498507a BD |
4742 | ctxt->mem_read.end = 0; |
4743 | } | |
4744 | ||
7b105ca2 | 4745 | int x86_emulate_insn(struct x86_emulate_ctxt *ctxt) |
8b4caf66 | 4746 | { |
0225fb50 | 4747 | const struct x86_emulate_ops *ops = ctxt->ops; |
1b30eaa8 | 4748 | int rc = X86EMUL_CONTINUE; |
9dac77fa | 4749 | int saved_dst_type = ctxt->dst.type; |
8b4caf66 | 4750 | |
9dac77fa | 4751 | ctxt->mem_read.pos = 0; |
310b5d30 | 4752 | |
e24186e0 PB |
4753 | /* LOCK prefix is allowed only with some instructions */ |
4754 | if (ctxt->lock_prefix && (!(ctxt->d & Lock) || ctxt->dst.type != OP_MEM)) { | |
35d3d4a1 | 4755 | rc = emulate_ud(ctxt); |
1161624f GN |
4756 | goto done; |
4757 | } | |
4758 | ||
e24186e0 | 4759 | if ((ctxt->d & SrcMask) == SrcMemFAddr && ctxt->src.type != OP_MEM) { |
35d3d4a1 | 4760 | rc = emulate_ud(ctxt); |
d380a5e4 GN |
4761 | goto done; |
4762 | } | |
4763 | ||
d40a6898 PB |
4764 | if (unlikely(ctxt->d & |
4765 | (No64|Undefined|Sse|Mmx|Intercept|CheckPerm|Priv|Prot|String))) { | |
4766 | if ((ctxt->mode == X86EMUL_MODE_PROT64 && (ctxt->d & No64)) || | |
4767 | (ctxt->d & Undefined)) { | |
4768 | rc = emulate_ud(ctxt); | |
4769 | goto done; | |
4770 | } | |
1253791d | 4771 | |
d40a6898 PB |
4772 | if (((ctxt->d & (Sse|Mmx)) && ((ops->get_cr(ctxt, 0) & X86_CR0_EM))) |
4773 | || ((ctxt->d & Sse) && !(ops->get_cr(ctxt, 4) & X86_CR4_OSFXSR))) { | |
4774 | rc = emulate_ud(ctxt); | |
cbe2c9d3 | 4775 | goto done; |
d40a6898 | 4776 | } |
cbe2c9d3 | 4777 | |
d40a6898 PB |
4778 | if ((ctxt->d & (Sse|Mmx)) && (ops->get_cr(ctxt, 0) & X86_CR0_TS)) { |
4779 | rc = emulate_nm(ctxt); | |
c4f035c6 | 4780 | goto done; |
d40a6898 | 4781 | } |
c4f035c6 | 4782 | |
d40a6898 PB |
4783 | if (ctxt->d & Mmx) { |
4784 | rc = flush_pending_x87_faults(ctxt); | |
4785 | if (rc != X86EMUL_CONTINUE) | |
4786 | goto done; | |
4787 | /* | |
4788 | * Now that we know the fpu is exception safe, we can fetch | |
4789 | * operands from it. | |
4790 | */ | |
4791 | fetch_possible_mmx_operand(ctxt, &ctxt->src); | |
4792 | fetch_possible_mmx_operand(ctxt, &ctxt->src2); | |
4793 | if (!(ctxt->d & Mov)) | |
4794 | fetch_possible_mmx_operand(ctxt, &ctxt->dst); | |
4795 | } | |
e92805ac | 4796 | |
685bbf4a | 4797 | if (unlikely(ctxt->guest_mode) && (ctxt->d & Intercept)) { |
d40a6898 PB |
4798 | rc = emulator_check_intercept(ctxt, ctxt->intercept, |
4799 | X86_ICPT_PRE_EXCEPT); | |
4800 | if (rc != X86EMUL_CONTINUE) | |
4801 | goto done; | |
4802 | } | |
8ea7d6ae | 4803 | |
d40a6898 PB |
4804 | /* Privileged instruction can be executed only in CPL=0 */ |
4805 | if ((ctxt->d & Priv) && ops->cpl(ctxt)) { | |
68efa764 NA |
4806 | if (ctxt->d & PrivUD) |
4807 | rc = emulate_ud(ctxt); | |
4808 | else | |
4809 | rc = emulate_gp(ctxt, 0); | |
d09beabd | 4810 | goto done; |
d40a6898 | 4811 | } |
d09beabd | 4812 | |
d40a6898 PB |
4813 | /* Instruction can only be executed in protected mode */ |
4814 | if ((ctxt->d & Prot) && ctxt->mode < X86EMUL_MODE_PROT16) { | |
4815 | rc = emulate_ud(ctxt); | |
c4f035c6 | 4816 | goto done; |
d40a6898 | 4817 | } |
c4f035c6 | 4818 | |
d40a6898 | 4819 | /* Do instruction specific permission checks */ |
685bbf4a | 4820 | if (ctxt->d & CheckPerm) { |
d40a6898 PB |
4821 | rc = ctxt->check_perm(ctxt); |
4822 | if (rc != X86EMUL_CONTINUE) | |
4823 | goto done; | |
4824 | } | |
4825 | ||
685bbf4a | 4826 | if (unlikely(ctxt->guest_mode) && (ctxt->d & Intercept)) { |
d40a6898 PB |
4827 | rc = emulator_check_intercept(ctxt, ctxt->intercept, |
4828 | X86_ICPT_POST_EXCEPT); | |
4829 | if (rc != X86EMUL_CONTINUE) | |
4830 | goto done; | |
4831 | } | |
4832 | ||
4833 | if (ctxt->rep_prefix && (ctxt->d & String)) { | |
4834 | /* All REP prefixes have the same first termination condition */ | |
4835 | if (address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) == 0) { | |
4836 | ctxt->eip = ctxt->_eip; | |
4467c3f1 | 4837 | ctxt->eflags &= ~EFLG_RF; |
d40a6898 PB |
4838 | goto done; |
4839 | } | |
b9fa9d6b | 4840 | } |
b9fa9d6b AK |
4841 | } |
4842 | ||
9dac77fa AK |
4843 | if ((ctxt->src.type == OP_MEM) && !(ctxt->d & NoAccess)) { |
4844 | rc = segmented_read(ctxt, ctxt->src.addr.mem, | |
4845 | ctxt->src.valptr, ctxt->src.bytes); | |
b60d513c | 4846 | if (rc != X86EMUL_CONTINUE) |
8b4caf66 | 4847 | goto done; |
9dac77fa | 4848 | ctxt->src.orig_val64 = ctxt->src.val64; |
8b4caf66 LV |
4849 | } |
4850 | ||
9dac77fa AK |
4851 | if (ctxt->src2.type == OP_MEM) { |
4852 | rc = segmented_read(ctxt, ctxt->src2.addr.mem, | |
4853 | &ctxt->src2.val, ctxt->src2.bytes); | |
e35b7b9c GN |
4854 | if (rc != X86EMUL_CONTINUE) |
4855 | goto done; | |
4856 | } | |
4857 | ||
9dac77fa | 4858 | if ((ctxt->d & DstMask) == ImplicitOps) |
8b4caf66 LV |
4859 | goto special_insn; |
4860 | ||
4861 | ||
9dac77fa | 4862 | if ((ctxt->dst.type == OP_MEM) && !(ctxt->d & Mov)) { |
69f55cb1 | 4863 | /* optimisation - avoid slow emulated read if Mov */ |
9dac77fa AK |
4864 | rc = segmented_read(ctxt, ctxt->dst.addr.mem, |
4865 | &ctxt->dst.val, ctxt->dst.bytes); | |
69f55cb1 GN |
4866 | if (rc != X86EMUL_CONTINUE) |
4867 | goto done; | |
038e51de | 4868 | } |
9dac77fa | 4869 | ctxt->dst.orig_val = ctxt->dst.val; |
038e51de | 4870 | |
018a98db AK |
4871 | special_insn: |
4872 | ||
685bbf4a | 4873 | if (unlikely(ctxt->guest_mode) && (ctxt->d & Intercept)) { |
9dac77fa | 4874 | rc = emulator_check_intercept(ctxt, ctxt->intercept, |
8a76d7f2 | 4875 | X86_ICPT_POST_MEMACCESS); |
c4f035c6 AK |
4876 | if (rc != X86EMUL_CONTINUE) |
4877 | goto done; | |
4878 | } | |
4879 | ||
b9a1ecb9 NA |
4880 | if (ctxt->rep_prefix && (ctxt->d & String)) |
4881 | ctxt->eflags |= EFLG_RF; | |
4882 | else | |
4883 | ctxt->eflags &= ~EFLG_RF; | |
4467c3f1 | 4884 | |
9dac77fa | 4885 | if (ctxt->execute) { |
e28bbd44 AK |
4886 | if (ctxt->d & Fastop) { |
4887 | void (*fop)(struct fastop *) = (void *)ctxt->execute; | |
4888 | rc = fastop(ctxt, fop); | |
4889 | if (rc != X86EMUL_CONTINUE) | |
4890 | goto done; | |
4891 | goto writeback; | |
4892 | } | |
9dac77fa | 4893 | rc = ctxt->execute(ctxt); |
ef65c889 AK |
4894 | if (rc != X86EMUL_CONTINUE) |
4895 | goto done; | |
4896 | goto writeback; | |
4897 | } | |
4898 | ||
1ce19dc1 | 4899 | if (ctxt->opcode_len == 2) |
6aa8b732 | 4900 | goto twobyte_insn; |
0bc5eedb BP |
4901 | else if (ctxt->opcode_len == 3) |
4902 | goto threebyte_insn; | |
6aa8b732 | 4903 | |
9dac77fa | 4904 | switch (ctxt->b) { |
6aa8b732 | 4905 | case 0x63: /* movsxd */ |
8b4caf66 | 4906 | if (ctxt->mode != X86EMUL_MODE_PROT64) |
6aa8b732 | 4907 | goto cannot_emulate; |
9dac77fa | 4908 | ctxt->dst.val = (s32) ctxt->src.val; |
6aa8b732 | 4909 | break; |
b2833e3c | 4910 | case 0x70 ... 0x7f: /* jcc (short) */ |
9dac77fa | 4911 | if (test_cc(ctxt->b, ctxt->eflags)) |
234f3ce4 | 4912 | rc = jmp_rel(ctxt, ctxt->src.val); |
018a98db | 4913 | break; |
7e0b54b1 | 4914 | case 0x8d: /* lea r16/r32, m */ |
9dac77fa | 4915 | ctxt->dst.val = ctxt->src.addr.mem.ea; |
7e0b54b1 | 4916 | break; |
3d9e77df | 4917 | case 0x90 ... 0x97: /* nop / xchg reg, rax */ |
dd856efa | 4918 | if (ctxt->dst.addr.reg == reg_rmw(ctxt, VCPU_REGS_RAX)) |
a825f5cc NA |
4919 | ctxt->dst.type = OP_NONE; |
4920 | else | |
4921 | rc = em_xchg(ctxt); | |
e4f973ae | 4922 | break; |
e8b6fa70 | 4923 | case 0x98: /* cbw/cwde/cdqe */ |
9dac77fa AK |
4924 | switch (ctxt->op_bytes) { |
4925 | case 2: ctxt->dst.val = (s8)ctxt->dst.val; break; | |
4926 | case 4: ctxt->dst.val = (s16)ctxt->dst.val; break; | |
4927 | case 8: ctxt->dst.val = (s32)ctxt->dst.val; break; | |
e8b6fa70 WY |
4928 | } |
4929 | break; | |
6e154e56 | 4930 | case 0xcc: /* int3 */ |
5c5df76b TY |
4931 | rc = emulate_int(ctxt, 3); |
4932 | break; | |
6e154e56 | 4933 | case 0xcd: /* int n */ |
9dac77fa | 4934 | rc = emulate_int(ctxt, ctxt->src.val); |
6e154e56 MG |
4935 | break; |
4936 | case 0xce: /* into */ | |
5c5df76b TY |
4937 | if (ctxt->eflags & EFLG_OF) |
4938 | rc = emulate_int(ctxt, 4); | |
6e154e56 | 4939 | break; |
1a52e051 | 4940 | case 0xe9: /* jmp rel */ |
db5b0762 | 4941 | case 0xeb: /* jmp rel short */ |
234f3ce4 | 4942 | rc = jmp_rel(ctxt, ctxt->src.val); |
9dac77fa | 4943 | ctxt->dst.type = OP_NONE; /* Disable writeback. */ |
1a52e051 | 4944 | break; |
111de5d6 | 4945 | case 0xf4: /* hlt */ |
6c3287f7 | 4946 | ctxt->ops->halt(ctxt); |
19fdfa0d | 4947 | break; |
111de5d6 AK |
4948 | case 0xf5: /* cmc */ |
4949 | /* complement carry flag from eflags reg */ | |
4950 | ctxt->eflags ^= EFLG_CF; | |
111de5d6 AK |
4951 | break; |
4952 | case 0xf8: /* clc */ | |
4953 | ctxt->eflags &= ~EFLG_CF; | |
111de5d6 | 4954 | break; |
8744aa9a MG |
4955 | case 0xf9: /* stc */ |
4956 | ctxt->eflags |= EFLG_CF; | |
4957 | break; | |
fb4616f4 MG |
4958 | case 0xfc: /* cld */ |
4959 | ctxt->eflags &= ~EFLG_DF; | |
fb4616f4 MG |
4960 | break; |
4961 | case 0xfd: /* std */ | |
4962 | ctxt->eflags |= EFLG_DF; | |
fb4616f4 | 4963 | break; |
91269b8f AK |
4964 | default: |
4965 | goto cannot_emulate; | |
6aa8b732 | 4966 | } |
018a98db | 4967 | |
7d9ddaed AK |
4968 | if (rc != X86EMUL_CONTINUE) |
4969 | goto done; | |
4970 | ||
018a98db | 4971 | writeback: |
fb32b1ed AK |
4972 | if (ctxt->d & SrcWrite) { |
4973 | BUG_ON(ctxt->src.type == OP_MEM || ctxt->src.type == OP_MEM_STR); | |
4974 | rc = writeback(ctxt, &ctxt->src); | |
4975 | if (rc != X86EMUL_CONTINUE) | |
4976 | goto done; | |
4977 | } | |
ee212297 NA |
4978 | if (!(ctxt->d & NoWrite)) { |
4979 | rc = writeback(ctxt, &ctxt->dst); | |
4980 | if (rc != X86EMUL_CONTINUE) | |
4981 | goto done; | |
4982 | } | |
018a98db | 4983 | |
5cd21917 GN |
4984 | /* |
4985 | * restore dst type in case the decoding will be reused | |
4986 | * (happens for string instruction ) | |
4987 | */ | |
9dac77fa | 4988 | ctxt->dst.type = saved_dst_type; |
5cd21917 | 4989 | |
9dac77fa | 4990 | if ((ctxt->d & SrcMask) == SrcSI) |
f3bd64c6 | 4991 | string_addr_inc(ctxt, VCPU_REGS_RSI, &ctxt->src); |
a682e354 | 4992 | |
9dac77fa | 4993 | if ((ctxt->d & DstMask) == DstDI) |
f3bd64c6 | 4994 | string_addr_inc(ctxt, VCPU_REGS_RDI, &ctxt->dst); |
d9271123 | 4995 | |
9dac77fa | 4996 | if (ctxt->rep_prefix && (ctxt->d & String)) { |
b3356bf0 | 4997 | unsigned int count; |
9dac77fa | 4998 | struct read_cache *r = &ctxt->io_read; |
b3356bf0 GN |
4999 | if ((ctxt->d & SrcMask) == SrcSI) |
5000 | count = ctxt->src.count; | |
5001 | else | |
5002 | count = ctxt->dst.count; | |
01485a22 | 5003 | register_address_increment(ctxt, VCPU_REGS_RCX, -count); |
3e2f65d5 | 5004 | |
d2ddd1c4 GN |
5005 | if (!string_insn_completed(ctxt)) { |
5006 | /* | |
5007 | * Re-enter guest when pio read ahead buffer is empty | |
5008 | * or, if it is not used, after each 1024 iteration. | |
5009 | */ | |
dd856efa | 5010 | if ((r->end != 0 || reg_read(ctxt, VCPU_REGS_RCX) & 0x3ff) && |
d2ddd1c4 GN |
5011 | (r->end == 0 || r->end != r->pos)) { |
5012 | /* | |
5013 | * Reset read cache. Usually happens before | |
5014 | * decode, but since instruction is restarted | |
5015 | * we have to do it here. | |
5016 | */ | |
9dac77fa | 5017 | ctxt->mem_read.end = 0; |
dd856efa | 5018 | writeback_registers(ctxt); |
d2ddd1c4 GN |
5019 | return EMULATION_RESTART; |
5020 | } | |
5021 | goto done; /* skip rip writeback */ | |
0fa6ccbd | 5022 | } |
b9a1ecb9 | 5023 | ctxt->eflags &= ~EFLG_RF; |
5cd21917 | 5024 | } |
d2ddd1c4 | 5025 | |
9dac77fa | 5026 | ctxt->eip = ctxt->_eip; |
018a98db AK |
5027 | |
5028 | done: | |
e0ad0b47 PB |
5029 | if (rc == X86EMUL_PROPAGATE_FAULT) { |
5030 | WARN_ON(ctxt->exception.vector > 0x1f); | |
da9cb575 | 5031 | ctxt->have_exception = true; |
e0ad0b47 | 5032 | } |
775fde86 JR |
5033 | if (rc == X86EMUL_INTERCEPTED) |
5034 | return EMULATION_INTERCEPTED; | |
5035 | ||
dd856efa AK |
5036 | if (rc == X86EMUL_CONTINUE) |
5037 | writeback_registers(ctxt); | |
5038 | ||
d2ddd1c4 | 5039 | return (rc == X86EMUL_UNHANDLEABLE) ? EMULATION_FAILED : EMULATION_OK; |
6aa8b732 AK |
5040 | |
5041 | twobyte_insn: | |
9dac77fa | 5042 | switch (ctxt->b) { |
018a98db | 5043 | case 0x09: /* wbinvd */ |
cfb22375 | 5044 | (ctxt->ops->wbinvd)(ctxt); |
f5f48ee1 SY |
5045 | break; |
5046 | case 0x08: /* invd */ | |
018a98db AK |
5047 | case 0x0d: /* GrpP (prefetch) */ |
5048 | case 0x18: /* Grp16 (prefetch/nop) */ | |
103f98ea | 5049 | case 0x1f: /* nop */ |
018a98db AK |
5050 | break; |
5051 | case 0x20: /* mov cr, reg */ | |
9dac77fa | 5052 | ctxt->dst.val = ops->get_cr(ctxt, ctxt->modrm_reg); |
018a98db | 5053 | break; |
6aa8b732 | 5054 | case 0x21: /* mov from dr to reg */ |
9dac77fa | 5055 | ops->get_dr(ctxt, ctxt->modrm_reg, &ctxt->dst.val); |
6aa8b732 | 5056 | break; |
6aa8b732 | 5057 | case 0x40 ... 0x4f: /* cmov */ |
140bad89 NA |
5058 | if (test_cc(ctxt->b, ctxt->eflags)) |
5059 | ctxt->dst.val = ctxt->src.val; | |
5060 | else if (ctxt->mode != X86EMUL_MODE_PROT64 || | |
5061 | ctxt->op_bytes != 4) | |
9dac77fa | 5062 | ctxt->dst.type = OP_NONE; /* no writeback */ |
6aa8b732 | 5063 | break; |
b2833e3c | 5064 | case 0x80 ... 0x8f: /* jnz rel, etc*/ |
9dac77fa | 5065 | if (test_cc(ctxt->b, ctxt->eflags)) |
234f3ce4 | 5066 | rc = jmp_rel(ctxt, ctxt->src.val); |
018a98db | 5067 | break; |
ee45b58e | 5068 | case 0x90 ... 0x9f: /* setcc r/m8 */ |
9dac77fa | 5069 | ctxt->dst.val = test_cc(ctxt->b, ctxt->eflags); |
ee45b58e | 5070 | break; |
6aa8b732 | 5071 | case 0xb6 ... 0xb7: /* movzx */ |
9dac77fa | 5072 | ctxt->dst.bytes = ctxt->op_bytes; |
361cad2b | 5073 | ctxt->dst.val = (ctxt->src.bytes == 1) ? (u8) ctxt->src.val |
9dac77fa | 5074 | : (u16) ctxt->src.val; |
6aa8b732 | 5075 | break; |
6aa8b732 | 5076 | case 0xbe ... 0xbf: /* movsx */ |
9dac77fa | 5077 | ctxt->dst.bytes = ctxt->op_bytes; |
361cad2b | 5078 | ctxt->dst.val = (ctxt->src.bytes == 1) ? (s8) ctxt->src.val : |
9dac77fa | 5079 | (s16) ctxt->src.val; |
6aa8b732 | 5080 | break; |
91269b8f AK |
5081 | default: |
5082 | goto cannot_emulate; | |
6aa8b732 | 5083 | } |
7d9ddaed | 5084 | |
0bc5eedb BP |
5085 | threebyte_insn: |
5086 | ||
7d9ddaed AK |
5087 | if (rc != X86EMUL_CONTINUE) |
5088 | goto done; | |
5089 | ||
6aa8b732 AK |
5090 | goto writeback; |
5091 | ||
5092 | cannot_emulate: | |
a0c0ab2f | 5093 | return EMULATION_FAILED; |
6aa8b732 | 5094 | } |
dd856efa AK |
5095 | |
5096 | void emulator_invalidate_register_cache(struct x86_emulate_ctxt *ctxt) | |
5097 | { | |
5098 | invalidate_registers(ctxt); | |
5099 | } | |
5100 | ||
5101 | void emulator_writeback_register_cache(struct x86_emulate_ctxt *ctxt) | |
5102 | { | |
5103 | writeback_registers(ctxt); | |
5104 | } |