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) | |
16bebefe | 89 | #define DstMem16 (OpMem16 << DstShift) |
a9945549 AK |
90 | #define DstImmUByte (OpImmUByte << DstShift) |
91 | #define DstDX (OpDX << DstShift) | |
820207c8 | 92 | #define DstAccLo (OpAccLo << DstShift) |
a9945549 | 93 | #define DstMask (OpMask << DstShift) |
6aa8b732 | 94 | /* Source operand type. */ |
0fe59128 AK |
95 | #define SrcShift 6 |
96 | #define SrcNone (OpNone << SrcShift) | |
97 | #define SrcReg (OpReg << SrcShift) | |
98 | #define SrcMem (OpMem << SrcShift) | |
99 | #define SrcMem16 (OpMem16 << SrcShift) | |
100 | #define SrcMem32 (OpMem32 << SrcShift) | |
101 | #define SrcImm (OpImm << SrcShift) | |
102 | #define SrcImmByte (OpImmByte << SrcShift) | |
103 | #define SrcOne (OpOne << SrcShift) | |
104 | #define SrcImmUByte (OpImmUByte << SrcShift) | |
105 | #define SrcImmU (OpImmU << SrcShift) | |
106 | #define SrcSI (OpSI << SrcShift) | |
7fa57952 | 107 | #define SrcXLat (OpXLat << SrcShift) |
0fe59128 AK |
108 | #define SrcImmFAddr (OpImmFAddr << SrcShift) |
109 | #define SrcMemFAddr (OpMemFAddr << SrcShift) | |
110 | #define SrcAcc (OpAcc << SrcShift) | |
111 | #define SrcImmU16 (OpImmU16 << SrcShift) | |
5e2c6883 | 112 | #define SrcImm64 (OpImm64 << SrcShift) |
0fe59128 | 113 | #define SrcDX (OpDX << SrcShift) |
28867cee | 114 | #define SrcMem8 (OpMem8 << SrcShift) |
820207c8 | 115 | #define SrcAccHi (OpAccHi << SrcShift) |
0fe59128 | 116 | #define SrcMask (OpMask << SrcShift) |
221192bd MT |
117 | #define BitOp (1<<11) |
118 | #define MemAbs (1<<12) /* Memory operand is absolute displacement */ | |
119 | #define String (1<<13) /* String instruction (rep capable) */ | |
120 | #define Stack (1<<14) /* Stack instruction (push/pop) */ | |
121 | #define GroupMask (7<<15) /* Opcode uses one of the group mechanisms */ | |
122 | #define Group (1<<15) /* Bits 3:5 of modrm byte extend opcode */ | |
123 | #define GroupDual (2<<15) /* Alternate decoding of mod == 3 */ | |
124 | #define Prefix (3<<15) /* Instruction varies with 66/f2/f3 prefix */ | |
125 | #define RMExt (4<<15) /* Opcode extension in ModRM r/m if mod == 3 */ | |
045a282c | 126 | #define Escape (5<<15) /* Escape to coprocessor instruction */ |
39f062ff | 127 | #define InstrDual (6<<15) /* Alternate instruction decoding of mod == 3 */ |
2276b511 | 128 | #define ModeDual (7<<15) /* Different instruction for 32/64 bit */ |
221192bd | 129 | #define Sse (1<<18) /* SSE Vector instruction */ |
20c29ff2 AK |
130 | /* Generic ModRM decode. */ |
131 | #define ModRM (1<<19) | |
132 | /* Destination is only written; never read. */ | |
133 | #define Mov (1<<20) | |
d8769fed | 134 | /* Misc flags */ |
8ea7d6ae | 135 | #define Prot (1<<21) /* instruction generates #UD if not in prot-mode */ |
b51e974f | 136 | #define EmulateOnUD (1<<22) /* Emulate if unsupported by the host */ |
5a506b12 | 137 | #define NoAccess (1<<23) /* Don't access memory (lea/invlpg/verr etc) */ |
7f9b4b75 | 138 | #define Op3264 (1<<24) /* Operand is 64b in long mode, 32b otherwise */ |
047a4818 | 139 | #define Undefined (1<<25) /* No Such Instruction */ |
d380a5e4 | 140 | #define Lock (1<<26) /* lock prefix is allowed for the instruction */ |
e92805ac | 141 | #define Priv (1<<27) /* instruction generates #GP if current CPL != 0 */ |
d8769fed | 142 | #define No64 (1<<28) |
d5ae7ce8 | 143 | #define PageTable (1 << 29) /* instruction used to write page table */ |
0b789eee | 144 | #define NotImpl (1 << 30) /* instruction is not implemented */ |
0dc8d10f | 145 | /* Source 2 operand type */ |
0b789eee | 146 | #define Src2Shift (31) |
4dd6a57d | 147 | #define Src2None (OpNone << Src2Shift) |
ab2c5ce6 | 148 | #define Src2Mem (OpMem << Src2Shift) |
4dd6a57d AK |
149 | #define Src2CL (OpCL << Src2Shift) |
150 | #define Src2ImmByte (OpImmByte << Src2Shift) | |
151 | #define Src2One (OpOne << Src2Shift) | |
152 | #define Src2Imm (OpImm << Src2Shift) | |
c191a7a0 AK |
153 | #define Src2ES (OpES << Src2Shift) |
154 | #define Src2CS (OpCS << Src2Shift) | |
155 | #define Src2SS (OpSS << Src2Shift) | |
156 | #define Src2DS (OpDS << Src2Shift) | |
157 | #define Src2FS (OpFS << Src2Shift) | |
158 | #define Src2GS (OpGS << Src2Shift) | |
4dd6a57d | 159 | #define Src2Mask (OpMask << Src2Shift) |
cbe2c9d3 | 160 | #define Mmx ((u64)1 << 40) /* MMX Vector instruction */ |
1c11b376 AK |
161 | #define Aligned ((u64)1 << 41) /* Explicitly aligned (e.g. MOVDQA) */ |
162 | #define Unaligned ((u64)1 << 42) /* Explicitly unaligned (e.g. MOVDQU) */ | |
163 | #define Avx ((u64)1 << 43) /* Advanced Vector Extensions */ | |
e28bbd44 | 164 | #define Fastop ((u64)1 << 44) /* Use opcode::u.fastop */ |
b6744dc3 | 165 | #define NoWrite ((u64)1 << 45) /* No writeback */ |
fb32b1ed | 166 | #define SrcWrite ((u64)1 << 46) /* Write back src operand */ |
9b88ae99 | 167 | #define NoMod ((u64)1 << 47) /* Mod field is ignored */ |
d40a6898 PB |
168 | #define Intercept ((u64)1 << 48) /* Has valid intercept field */ |
169 | #define CheckPerm ((u64)1 << 49) /* Has valid check_perm field */ | |
68efa764 | 170 | #define PrivUD ((u64)1 << 51) /* #UD instead of #GP on CPL > 0 */ |
58b7075d | 171 | #define NearBranch ((u64)1 << 52) /* Near branches */ |
ed9aad21 | 172 | #define No16 ((u64)1 << 53) /* No 16 bit operand */ |
ab708099 | 173 | #define IncSP ((u64)1 << 54) /* SP is incremented before ModRM calc */ |
6aa8b732 | 174 | |
820207c8 | 175 | #define DstXacc (DstAccLo | SrcAccHi | SrcWrite) |
6aa8b732 | 176 | |
d0e53325 AK |
177 | #define X2(x...) x, x |
178 | #define X3(x...) X2(x), x | |
179 | #define X4(x...) X2(x), X2(x) | |
180 | #define X5(x...) X4(x), x | |
181 | #define X6(x...) X4(x), X2(x) | |
182 | #define X7(x...) X4(x), X3(x) | |
183 | #define X8(x...) X4(x), X4(x) | |
184 | #define X16(x...) X8(x), X8(x) | |
83babbca | 185 | |
e28bbd44 AK |
186 | #define NR_FASTOP (ilog2(sizeof(ulong)) + 1) |
187 | #define FASTOP_SIZE 8 | |
188 | ||
189 | /* | |
190 | * fastop functions have a special calling convention: | |
191 | * | |
017da7b6 AK |
192 | * dst: rax (in/out) |
193 | * src: rdx (in/out) | |
e28bbd44 AK |
194 | * src2: rcx (in) |
195 | * flags: rflags (in/out) | |
b8c0b6ae | 196 | * ex: rsi (in:fastop pointer, out:zero if exception) |
e28bbd44 AK |
197 | * |
198 | * Moreover, they are all exactly FASTOP_SIZE bytes long, so functions for | |
199 | * different operand sizes can be reached by calculation, rather than a jump | |
200 | * table (which would be bigger than the code). | |
201 | * | |
202 | * fastop functions are declared as taking a never-defined fastop parameter, | |
203 | * so they can't be called from C directly. | |
204 | */ | |
205 | ||
206 | struct fastop; | |
207 | ||
d65b1dee | 208 | struct opcode { |
b1ea50b2 AK |
209 | u64 flags : 56; |
210 | u64 intercept : 8; | |
120df890 | 211 | union { |
ef65c889 | 212 | int (*execute)(struct x86_emulate_ctxt *ctxt); |
fd0a0d82 MK |
213 | const struct opcode *group; |
214 | const struct group_dual *gdual; | |
215 | const struct gprefix *gprefix; | |
045a282c | 216 | const struct escape *esc; |
39f062ff | 217 | const struct instr_dual *idual; |
2276b511 | 218 | const struct mode_dual *mdual; |
e28bbd44 | 219 | void (*fastop)(struct fastop *fake); |
120df890 | 220 | } u; |
d09beabd | 221 | int (*check_perm)(struct x86_emulate_ctxt *ctxt); |
120df890 AK |
222 | }; |
223 | ||
224 | struct group_dual { | |
225 | struct opcode mod012[8]; | |
226 | struct opcode mod3[8]; | |
d65b1dee AK |
227 | }; |
228 | ||
0d7cdee8 AK |
229 | struct gprefix { |
230 | struct opcode pfx_no; | |
231 | struct opcode pfx_66; | |
232 | struct opcode pfx_f2; | |
233 | struct opcode pfx_f3; | |
234 | }; | |
235 | ||
045a282c GN |
236 | struct escape { |
237 | struct opcode op[8]; | |
238 | struct opcode high[64]; | |
239 | }; | |
240 | ||
39f062ff NA |
241 | struct instr_dual { |
242 | struct opcode mod012; | |
243 | struct opcode mod3; | |
244 | }; | |
245 | ||
2276b511 NA |
246 | struct mode_dual { |
247 | struct opcode mode32; | |
248 | struct opcode mode64; | |
249 | }; | |
250 | ||
6aa8b732 | 251 | /* EFLAGS bit definitions. */ |
d4c6a154 GN |
252 | #define EFLG_ID (1<<21) |
253 | #define EFLG_VIP (1<<20) | |
254 | #define EFLG_VIF (1<<19) | |
255 | #define EFLG_AC (1<<18) | |
b1d86143 AP |
256 | #define EFLG_VM (1<<17) |
257 | #define EFLG_RF (1<<16) | |
d4c6a154 GN |
258 | #define EFLG_IOPL (3<<12) |
259 | #define EFLG_NT (1<<14) | |
6aa8b732 AK |
260 | #define EFLG_OF (1<<11) |
261 | #define EFLG_DF (1<<10) | |
b1d86143 | 262 | #define EFLG_IF (1<<9) |
d4c6a154 | 263 | #define EFLG_TF (1<<8) |
6aa8b732 AK |
264 | #define EFLG_SF (1<<7) |
265 | #define EFLG_ZF (1<<6) | |
266 | #define EFLG_AF (1<<4) | |
267 | #define EFLG_PF (1<<2) | |
268 | #define EFLG_CF (1<<0) | |
269 | ||
62bd430e MG |
270 | #define EFLG_RESERVED_ZEROS_MASK 0xffc0802a |
271 | #define EFLG_RESERVED_ONE_MASK 2 | |
272 | ||
3dc4bc4f NA |
273 | enum x86_transfer_type { |
274 | X86_TRANSFER_NONE, | |
275 | X86_TRANSFER_CALL_JMP, | |
276 | X86_TRANSFER_RET, | |
277 | X86_TRANSFER_TASK_SWITCH, | |
278 | }; | |
279 | ||
dd856efa AK |
280 | static ulong reg_read(struct x86_emulate_ctxt *ctxt, unsigned nr) |
281 | { | |
282 | if (!(ctxt->regs_valid & (1 << nr))) { | |
283 | ctxt->regs_valid |= 1 << nr; | |
284 | ctxt->_regs[nr] = ctxt->ops->read_gpr(ctxt, nr); | |
285 | } | |
286 | return ctxt->_regs[nr]; | |
287 | } | |
288 | ||
289 | static ulong *reg_write(struct x86_emulate_ctxt *ctxt, unsigned nr) | |
290 | { | |
291 | ctxt->regs_valid |= 1 << nr; | |
292 | ctxt->regs_dirty |= 1 << nr; | |
293 | return &ctxt->_regs[nr]; | |
294 | } | |
295 | ||
296 | static ulong *reg_rmw(struct x86_emulate_ctxt *ctxt, unsigned nr) | |
297 | { | |
298 | reg_read(ctxt, nr); | |
299 | return reg_write(ctxt, nr); | |
300 | } | |
301 | ||
302 | static void writeback_registers(struct x86_emulate_ctxt *ctxt) | |
303 | { | |
304 | unsigned reg; | |
305 | ||
306 | for_each_set_bit(reg, (ulong *)&ctxt->regs_dirty, 16) | |
307 | ctxt->ops->write_gpr(ctxt, reg, ctxt->_regs[reg]); | |
308 | } | |
309 | ||
310 | static void invalidate_registers(struct x86_emulate_ctxt *ctxt) | |
311 | { | |
312 | ctxt->regs_dirty = 0; | |
313 | ctxt->regs_valid = 0; | |
314 | } | |
315 | ||
6aa8b732 AK |
316 | /* |
317 | * These EFLAGS bits are restored from saved value during emulation, and | |
318 | * any changes are written back to the saved value after emulation. | |
319 | */ | |
320 | #define EFLAGS_MASK (EFLG_OF|EFLG_SF|EFLG_ZF|EFLG_AF|EFLG_PF|EFLG_CF) | |
321 | ||
dda96d8f AK |
322 | #ifdef CONFIG_X86_64 |
323 | #define ON64(x) x | |
324 | #else | |
325 | #define ON64(x) | |
326 | #endif | |
327 | ||
4d758349 AK |
328 | static int fastop(struct x86_emulate_ctxt *ctxt, void (*fop)(struct fastop *)); |
329 | ||
b7d491e7 AK |
330 | #define FOP_ALIGN ".align " __stringify(FASTOP_SIZE) " \n\t" |
331 | #define FOP_RET "ret \n\t" | |
332 | ||
333 | #define FOP_START(op) \ | |
334 | extern void em_##op(struct fastop *fake); \ | |
335 | asm(".pushsection .text, \"ax\" \n\t" \ | |
336 | ".global em_" #op " \n\t" \ | |
337 | FOP_ALIGN \ | |
338 | "em_" #op ": \n\t" | |
339 | ||
340 | #define FOP_END \ | |
341 | ".popsection") | |
342 | ||
0bdea068 AK |
343 | #define FOPNOP() FOP_ALIGN FOP_RET |
344 | ||
b7d491e7 | 345 | #define FOP1E(op, dst) \ |
b8c0b6ae AK |
346 | FOP_ALIGN "10: " #op " %" #dst " \n\t" FOP_RET |
347 | ||
348 | #define FOP1EEX(op, dst) \ | |
349 | FOP1E(op, dst) _ASM_EXTABLE(10b, kvm_fastop_exception) | |
b7d491e7 AK |
350 | |
351 | #define FASTOP1(op) \ | |
352 | FOP_START(op) \ | |
353 | FOP1E(op##b, al) \ | |
354 | FOP1E(op##w, ax) \ | |
355 | FOP1E(op##l, eax) \ | |
356 | ON64(FOP1E(op##q, rax)) \ | |
357 | FOP_END | |
358 | ||
b9fa409b AK |
359 | /* 1-operand, using src2 (for MUL/DIV r/m) */ |
360 | #define FASTOP1SRC2(op, name) \ | |
361 | FOP_START(name) \ | |
362 | FOP1E(op, cl) \ | |
363 | FOP1E(op, cx) \ | |
364 | FOP1E(op, ecx) \ | |
365 | ON64(FOP1E(op, rcx)) \ | |
366 | FOP_END | |
367 | ||
b8c0b6ae AK |
368 | /* 1-operand, using src2 (for MUL/DIV r/m), with exceptions */ |
369 | #define FASTOP1SRC2EX(op, name) \ | |
370 | FOP_START(name) \ | |
371 | FOP1EEX(op, cl) \ | |
372 | FOP1EEX(op, cx) \ | |
373 | FOP1EEX(op, ecx) \ | |
374 | ON64(FOP1EEX(op, rcx)) \ | |
375 | FOP_END | |
376 | ||
f7857f35 AK |
377 | #define FOP2E(op, dst, src) \ |
378 | FOP_ALIGN #op " %" #src ", %" #dst " \n\t" FOP_RET | |
379 | ||
380 | #define FASTOP2(op) \ | |
381 | FOP_START(op) \ | |
017da7b6 AK |
382 | FOP2E(op##b, al, dl) \ |
383 | FOP2E(op##w, ax, dx) \ | |
384 | FOP2E(op##l, eax, edx) \ | |
385 | ON64(FOP2E(op##q, rax, rdx)) \ | |
f7857f35 AK |
386 | FOP_END |
387 | ||
11c363ba AK |
388 | /* 2 operand, word only */ |
389 | #define FASTOP2W(op) \ | |
390 | FOP_START(op) \ | |
391 | FOPNOP() \ | |
017da7b6 AK |
392 | FOP2E(op##w, ax, dx) \ |
393 | FOP2E(op##l, eax, edx) \ | |
394 | ON64(FOP2E(op##q, rax, rdx)) \ | |
11c363ba AK |
395 | FOP_END |
396 | ||
007a3b54 AK |
397 | /* 2 operand, src is CL */ |
398 | #define FASTOP2CL(op) \ | |
399 | FOP_START(op) \ | |
400 | FOP2E(op##b, al, cl) \ | |
401 | FOP2E(op##w, ax, cl) \ | |
402 | FOP2E(op##l, eax, cl) \ | |
403 | ON64(FOP2E(op##q, rax, cl)) \ | |
404 | FOP_END | |
405 | ||
5aca3722 NA |
406 | /* 2 operand, src and dest are reversed */ |
407 | #define FASTOP2R(op, name) \ | |
408 | FOP_START(name) \ | |
409 | FOP2E(op##b, dl, al) \ | |
410 | FOP2E(op##w, dx, ax) \ | |
411 | FOP2E(op##l, edx, eax) \ | |
412 | ON64(FOP2E(op##q, rdx, rax)) \ | |
413 | FOP_END | |
414 | ||
0bdea068 AK |
415 | #define FOP3E(op, dst, src, src2) \ |
416 | FOP_ALIGN #op " %" #src2 ", %" #src ", %" #dst " \n\t" FOP_RET | |
417 | ||
418 | /* 3-operand, word-only, src2=cl */ | |
419 | #define FASTOP3WCL(op) \ | |
420 | FOP_START(op) \ | |
421 | FOPNOP() \ | |
017da7b6 AK |
422 | FOP3E(op##w, ax, dx, cl) \ |
423 | FOP3E(op##l, eax, edx, cl) \ | |
424 | ON64(FOP3E(op##q, rax, rdx, cl)) \ | |
0bdea068 AK |
425 | FOP_END |
426 | ||
9ae9feba AK |
427 | /* Special case for SETcc - 1 instruction per cc */ |
428 | #define FOP_SETCC(op) ".align 4; " #op " %al; ret \n\t" | |
429 | ||
b8c0b6ae AK |
430 | asm(".global kvm_fastop_exception \n" |
431 | "kvm_fastop_exception: xor %esi, %esi; ret"); | |
432 | ||
9ae9feba AK |
433 | FOP_START(setcc) |
434 | FOP_SETCC(seto) | |
435 | FOP_SETCC(setno) | |
436 | FOP_SETCC(setc) | |
437 | FOP_SETCC(setnc) | |
438 | FOP_SETCC(setz) | |
439 | FOP_SETCC(setnz) | |
440 | FOP_SETCC(setbe) | |
441 | FOP_SETCC(setnbe) | |
442 | FOP_SETCC(sets) | |
443 | FOP_SETCC(setns) | |
444 | FOP_SETCC(setp) | |
445 | FOP_SETCC(setnp) | |
446 | FOP_SETCC(setl) | |
447 | FOP_SETCC(setnl) | |
448 | FOP_SETCC(setle) | |
449 | FOP_SETCC(setnle) | |
450 | FOP_END; | |
451 | ||
326f578f PB |
452 | FOP_START(salc) "pushf; sbb %al, %al; popf \n\t" FOP_RET |
453 | FOP_END; | |
454 | ||
8a76d7f2 JR |
455 | static int emulator_check_intercept(struct x86_emulate_ctxt *ctxt, |
456 | enum x86_intercept intercept, | |
457 | enum x86_intercept_stage stage) | |
458 | { | |
459 | struct x86_instruction_info info = { | |
460 | .intercept = intercept, | |
9dac77fa AK |
461 | .rep_prefix = ctxt->rep_prefix, |
462 | .modrm_mod = ctxt->modrm_mod, | |
463 | .modrm_reg = ctxt->modrm_reg, | |
464 | .modrm_rm = ctxt->modrm_rm, | |
465 | .src_val = ctxt->src.val64, | |
6cbc5f5a | 466 | .dst_val = ctxt->dst.val64, |
9dac77fa AK |
467 | .src_bytes = ctxt->src.bytes, |
468 | .dst_bytes = ctxt->dst.bytes, | |
469 | .ad_bytes = ctxt->ad_bytes, | |
8a76d7f2 JR |
470 | .next_rip = ctxt->eip, |
471 | }; | |
472 | ||
2953538e | 473 | return ctxt->ops->intercept(ctxt, &info, stage); |
8a76d7f2 JR |
474 | } |
475 | ||
f47cfa31 AK |
476 | static void assign_masked(ulong *dest, ulong src, ulong mask) |
477 | { | |
478 | *dest = (*dest & ~mask) | (src & mask); | |
479 | } | |
480 | ||
9dac77fa | 481 | static inline unsigned long ad_mask(struct x86_emulate_ctxt *ctxt) |
ddcb2885 | 482 | { |
9dac77fa | 483 | return (1UL << (ctxt->ad_bytes << 3)) - 1; |
ddcb2885 HH |
484 | } |
485 | ||
f47cfa31 AK |
486 | static ulong stack_mask(struct x86_emulate_ctxt *ctxt) |
487 | { | |
488 | u16 sel; | |
489 | struct desc_struct ss; | |
490 | ||
491 | if (ctxt->mode == X86EMUL_MODE_PROT64) | |
492 | return ~0UL; | |
493 | ctxt->ops->get_segment(ctxt, &sel, &ss, NULL, VCPU_SREG_SS); | |
494 | return ~0U >> ((ss.d ^ 1) * 16); /* d=0: 0xffff; d=1: 0xffffffff */ | |
495 | } | |
496 | ||
612e89f0 AK |
497 | static int stack_size(struct x86_emulate_ctxt *ctxt) |
498 | { | |
499 | return (__fls(stack_mask(ctxt)) + 1) >> 3; | |
500 | } | |
501 | ||
6aa8b732 | 502 | /* Access/update address held in a register, based on addressing mode. */ |
e4706772 | 503 | static inline unsigned long |
9dac77fa | 504 | address_mask(struct x86_emulate_ctxt *ctxt, unsigned long reg) |
e4706772 | 505 | { |
9dac77fa | 506 | if (ctxt->ad_bytes == sizeof(unsigned long)) |
e4706772 HH |
507 | return reg; |
508 | else | |
9dac77fa | 509 | return reg & ad_mask(ctxt); |
e4706772 HH |
510 | } |
511 | ||
512 | static inline unsigned long | |
01485a22 | 513 | register_address(struct x86_emulate_ctxt *ctxt, int reg) |
e4706772 | 514 | { |
01485a22 | 515 | return address_mask(ctxt, reg_read(ctxt, reg)); |
e4706772 HH |
516 | } |
517 | ||
5ad105e5 AK |
518 | static void masked_increment(ulong *reg, ulong mask, int inc) |
519 | { | |
520 | assign_masked(reg, *reg + inc, mask); | |
521 | } | |
522 | ||
7a957275 | 523 | static inline void |
01485a22 | 524 | register_address_increment(struct x86_emulate_ctxt *ctxt, int reg, int inc) |
7a957275 | 525 | { |
5ad105e5 AK |
526 | ulong mask; |
527 | ||
9dac77fa | 528 | if (ctxt->ad_bytes == sizeof(unsigned long)) |
5ad105e5 | 529 | mask = ~0UL; |
7a957275 | 530 | else |
5ad105e5 | 531 | mask = ad_mask(ctxt); |
01485a22 | 532 | masked_increment(reg_rmw(ctxt, reg), mask, inc); |
5ad105e5 AK |
533 | } |
534 | ||
535 | static void rsp_increment(struct x86_emulate_ctxt *ctxt, int inc) | |
536 | { | |
dd856efa | 537 | masked_increment(reg_rmw(ctxt, VCPU_REGS_RSP), stack_mask(ctxt), inc); |
7a957275 | 538 | } |
6aa8b732 | 539 | |
56697687 AK |
540 | static u32 desc_limit_scaled(struct desc_struct *desc) |
541 | { | |
542 | u32 limit = get_desc_limit(desc); | |
543 | ||
544 | return desc->g ? (limit << 12) | 0xfff : limit; | |
545 | } | |
546 | ||
7b105ca2 | 547 | static unsigned long seg_base(struct x86_emulate_ctxt *ctxt, int seg) |
7a5b56df AK |
548 | { |
549 | if (ctxt->mode == X86EMUL_MODE_PROT64 && seg < VCPU_SREG_FS) | |
550 | return 0; | |
551 | ||
7b105ca2 | 552 | return ctxt->ops->get_cached_segment_base(ctxt, seg); |
7a5b56df AK |
553 | } |
554 | ||
35d3d4a1 AK |
555 | static int emulate_exception(struct x86_emulate_ctxt *ctxt, int vec, |
556 | u32 error, bool valid) | |
54b8486f | 557 | { |
e0ad0b47 | 558 | WARN_ON(vec > 0x1f); |
da9cb575 AK |
559 | ctxt->exception.vector = vec; |
560 | ctxt->exception.error_code = error; | |
561 | ctxt->exception.error_code_valid = valid; | |
35d3d4a1 | 562 | return X86EMUL_PROPAGATE_FAULT; |
54b8486f GN |
563 | } |
564 | ||
3b88e41a JR |
565 | static int emulate_db(struct x86_emulate_ctxt *ctxt) |
566 | { | |
567 | return emulate_exception(ctxt, DB_VECTOR, 0, false); | |
568 | } | |
569 | ||
35d3d4a1 | 570 | static int emulate_gp(struct x86_emulate_ctxt *ctxt, int err) |
54b8486f | 571 | { |
35d3d4a1 | 572 | return emulate_exception(ctxt, GP_VECTOR, err, true); |
54b8486f GN |
573 | } |
574 | ||
618ff15d AK |
575 | static int emulate_ss(struct x86_emulate_ctxt *ctxt, int err) |
576 | { | |
577 | return emulate_exception(ctxt, SS_VECTOR, err, true); | |
578 | } | |
579 | ||
35d3d4a1 | 580 | static int emulate_ud(struct x86_emulate_ctxt *ctxt) |
54b8486f | 581 | { |
35d3d4a1 | 582 | return emulate_exception(ctxt, UD_VECTOR, 0, false); |
54b8486f GN |
583 | } |
584 | ||
35d3d4a1 | 585 | static int emulate_ts(struct x86_emulate_ctxt *ctxt, int err) |
54b8486f | 586 | { |
35d3d4a1 | 587 | return emulate_exception(ctxt, TS_VECTOR, err, true); |
54b8486f GN |
588 | } |
589 | ||
34d1f490 AK |
590 | static int emulate_de(struct x86_emulate_ctxt *ctxt) |
591 | { | |
35d3d4a1 | 592 | return emulate_exception(ctxt, DE_VECTOR, 0, false); |
34d1f490 AK |
593 | } |
594 | ||
1253791d AK |
595 | static int emulate_nm(struct x86_emulate_ctxt *ctxt) |
596 | { | |
597 | return emulate_exception(ctxt, NM_VECTOR, 0, false); | |
598 | } | |
599 | ||
1aa36616 AK |
600 | static u16 get_segment_selector(struct x86_emulate_ctxt *ctxt, unsigned seg) |
601 | { | |
602 | u16 selector; | |
603 | struct desc_struct desc; | |
604 | ||
605 | ctxt->ops->get_segment(ctxt, &selector, &desc, NULL, seg); | |
606 | return selector; | |
607 | } | |
608 | ||
609 | static void set_segment_selector(struct x86_emulate_ctxt *ctxt, u16 selector, | |
610 | unsigned seg) | |
611 | { | |
612 | u16 dummy; | |
613 | u32 base3; | |
614 | struct desc_struct desc; | |
615 | ||
616 | ctxt->ops->get_segment(ctxt, &dummy, &desc, &base3, seg); | |
617 | ctxt->ops->set_segment(ctxt, selector, &desc, base3, seg); | |
618 | } | |
619 | ||
1c11b376 AK |
620 | /* |
621 | * x86 defines three classes of vector instructions: explicitly | |
622 | * aligned, explicitly unaligned, and the rest, which change behaviour | |
623 | * depending on whether they're AVX encoded or not. | |
624 | * | |
625 | * Also included is CMPXCHG16B which is not a vector instruction, yet it is | |
626 | * subject to the same check. | |
627 | */ | |
628 | static bool insn_aligned(struct x86_emulate_ctxt *ctxt, unsigned size) | |
629 | { | |
630 | if (likely(size < 16)) | |
631 | return false; | |
632 | ||
633 | if (ctxt->d & Aligned) | |
634 | return true; | |
635 | else if (ctxt->d & Unaligned) | |
636 | return false; | |
637 | else if (ctxt->d & Avx) | |
638 | return false; | |
639 | else | |
640 | return true; | |
641 | } | |
642 | ||
d09155d2 PB |
643 | static __always_inline int __linearize(struct x86_emulate_ctxt *ctxt, |
644 | struct segmented_address addr, | |
645 | unsigned *max_size, unsigned size, | |
646 | bool write, bool fetch, | |
d50eaa18 | 647 | enum x86emul_mode mode, ulong *linear) |
52fd8b44 | 648 | { |
618ff15d AK |
649 | struct desc_struct desc; |
650 | bool usable; | |
52fd8b44 | 651 | ulong la; |
618ff15d | 652 | u32 lim; |
1aa36616 | 653 | u16 sel; |
52fd8b44 | 654 | |
7b105ca2 | 655 | la = seg_base(ctxt, addr.seg) + addr.ea; |
fd56e154 | 656 | *max_size = 0; |
d50eaa18 | 657 | switch (mode) { |
618ff15d | 658 | case X86EMUL_MODE_PROT64: |
4be4de7e | 659 | if (is_noncanonical_address(la)) |
abc7d8a4 | 660 | goto bad; |
fd56e154 PB |
661 | |
662 | *max_size = min_t(u64, ~0u, (1ull << 48) - la); | |
663 | if (size > *max_size) | |
664 | goto bad; | |
618ff15d AK |
665 | break; |
666 | default: | |
1aa36616 AK |
667 | usable = ctxt->ops->get_segment(ctxt, &sel, &desc, NULL, |
668 | addr.seg); | |
618ff15d AK |
669 | if (!usable) |
670 | goto bad; | |
58b7825b GN |
671 | /* code segment in protected mode or read-only data segment */ |
672 | if ((((ctxt->mode != X86EMUL_MODE_REAL) && (desc.type & 8)) | |
673 | || !(desc.type & 2)) && write) | |
618ff15d AK |
674 | goto bad; |
675 | /* unreadable code segment */ | |
3d9b938e | 676 | if (!fetch && (desc.type & 8) && !(desc.type & 2)) |
618ff15d AK |
677 | goto bad; |
678 | lim = desc_limit_scaled(&desc); | |
997b0412 | 679 | if (!(desc.type & 8) && (desc.type & 4)) { |
fc058680 | 680 | /* expand-down segment */ |
fd56e154 | 681 | if (addr.ea <= lim) |
618ff15d AK |
682 | goto bad; |
683 | lim = desc.d ? 0xffffffff : 0xffff; | |
618ff15d | 684 | } |
997b0412 PB |
685 | if (addr.ea > lim) |
686 | goto bad; | |
bac15531 NA |
687 | if (lim == 0xffffffff) |
688 | *max_size = ~0u; | |
689 | else { | |
690 | *max_size = (u64)lim + 1 - addr.ea; | |
691 | if (size > *max_size) | |
692 | goto bad; | |
693 | } | |
31ff6488 | 694 | la &= (u32)-1; |
618ff15d AK |
695 | break; |
696 | } | |
1c11b376 AK |
697 | if (insn_aligned(ctxt, size) && ((la & (size - 1)) != 0)) |
698 | return emulate_gp(ctxt, 0); | |
52fd8b44 AK |
699 | *linear = la; |
700 | return X86EMUL_CONTINUE; | |
618ff15d AK |
701 | bad: |
702 | if (addr.seg == VCPU_SREG_SS) | |
3606189f | 703 | return emulate_ss(ctxt, 0); |
618ff15d | 704 | else |
3606189f | 705 | return emulate_gp(ctxt, 0); |
52fd8b44 AK |
706 | } |
707 | ||
3d9b938e NE |
708 | static int linearize(struct x86_emulate_ctxt *ctxt, |
709 | struct segmented_address addr, | |
710 | unsigned size, bool write, | |
711 | ulong *linear) | |
712 | { | |
fd56e154 | 713 | unsigned max_size; |
d50eaa18 NA |
714 | return __linearize(ctxt, addr, &max_size, size, write, false, |
715 | ctxt->mode, linear); | |
3d9b938e NE |
716 | } |
717 | ||
d50eaa18 NA |
718 | static inline int assign_eip(struct x86_emulate_ctxt *ctxt, ulong dst, |
719 | enum x86emul_mode mode) | |
720 | { | |
721 | ulong linear; | |
722 | int rc; | |
723 | unsigned max_size; | |
724 | struct segmented_address addr = { .seg = VCPU_SREG_CS, | |
725 | .ea = dst }; | |
726 | ||
727 | if (ctxt->op_bytes != sizeof(unsigned long)) | |
728 | addr.ea = dst & ((1UL << (ctxt->op_bytes << 3)) - 1); | |
729 | rc = __linearize(ctxt, addr, &max_size, 1, false, true, mode, &linear); | |
730 | if (rc == X86EMUL_CONTINUE) | |
731 | ctxt->_eip = addr.ea; | |
732 | return rc; | |
733 | } | |
734 | ||
735 | static inline int assign_eip_near(struct x86_emulate_ctxt *ctxt, ulong dst) | |
736 | { | |
737 | return assign_eip(ctxt, dst, ctxt->mode); | |
3d9b938e NE |
738 | } |
739 | ||
d50eaa18 NA |
740 | static int assign_eip_far(struct x86_emulate_ctxt *ctxt, ulong dst, |
741 | const struct desc_struct *cs_desc) | |
742 | { | |
743 | enum x86emul_mode mode = ctxt->mode; | |
82268083 | 744 | int rc; |
d50eaa18 NA |
745 | |
746 | #ifdef CONFIG_X86_64 | |
82268083 NA |
747 | if (ctxt->mode >= X86EMUL_MODE_PROT16) { |
748 | if (cs_desc->l) { | |
749 | u64 efer = 0; | |
d50eaa18 | 750 | |
82268083 NA |
751 | ctxt->ops->get_msr(ctxt, MSR_EFER, &efer); |
752 | if (efer & EFER_LMA) | |
753 | mode = X86EMUL_MODE_PROT64; | |
754 | } else | |
755 | mode = X86EMUL_MODE_PROT32; /* temporary value */ | |
d50eaa18 NA |
756 | } |
757 | #endif | |
758 | if (mode == X86EMUL_MODE_PROT16 || mode == X86EMUL_MODE_PROT32) | |
759 | mode = cs_desc->d ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16; | |
82268083 NA |
760 | rc = assign_eip(ctxt, dst, mode); |
761 | if (rc == X86EMUL_CONTINUE) | |
762 | ctxt->mode = mode; | |
763 | return rc; | |
d50eaa18 NA |
764 | } |
765 | ||
766 | static inline int jmp_rel(struct x86_emulate_ctxt *ctxt, int rel) | |
767 | { | |
768 | return assign_eip_near(ctxt, ctxt->_eip + rel); | |
769 | } | |
3d9b938e | 770 | |
3ca3ac4d AK |
771 | static int segmented_read_std(struct x86_emulate_ctxt *ctxt, |
772 | struct segmented_address addr, | |
773 | void *data, | |
774 | unsigned size) | |
775 | { | |
9fa088f4 AK |
776 | int rc; |
777 | ulong linear; | |
778 | ||
83b8795a | 779 | rc = linearize(ctxt, addr, size, false, &linear); |
9fa088f4 AK |
780 | if (rc != X86EMUL_CONTINUE) |
781 | return rc; | |
0f65dd70 | 782 | return ctxt->ops->read_std(ctxt, linear, data, size, &ctxt->exception); |
3ca3ac4d AK |
783 | } |
784 | ||
807941b1 | 785 | /* |
285ca9e9 | 786 | * Prefetch the remaining bytes of the instruction without crossing page |
807941b1 TY |
787 | * boundary if they are not in fetch_cache yet. |
788 | */ | |
9506d57d | 789 | static int __do_insn_fetch_bytes(struct x86_emulate_ctxt *ctxt, int op_size) |
62266869 | 790 | { |
62266869 | 791 | int rc; |
fd56e154 | 792 | unsigned size, max_size; |
285ca9e9 | 793 | unsigned long linear; |
17052f16 | 794 | int cur_size = ctxt->fetch.end - ctxt->fetch.data; |
285ca9e9 | 795 | struct segmented_address addr = { .seg = VCPU_SREG_CS, |
17052f16 PB |
796 | .ea = ctxt->eip + cur_size }; |
797 | ||
fd56e154 PB |
798 | /* |
799 | * We do not know exactly how many bytes will be needed, and | |
800 | * __linearize is expensive, so fetch as much as possible. We | |
801 | * just have to avoid going beyond the 15 byte limit, the end | |
802 | * of the segment, or the end of the page. | |
803 | * | |
804 | * __linearize is called with size 0 so that it does not do any | |
805 | * boundary check itself. Instead, we use max_size to check | |
806 | * against op_size. | |
807 | */ | |
d50eaa18 NA |
808 | rc = __linearize(ctxt, addr, &max_size, 0, false, true, ctxt->mode, |
809 | &linear); | |
719d5a9b PB |
810 | if (unlikely(rc != X86EMUL_CONTINUE)) |
811 | return rc; | |
812 | ||
fd56e154 | 813 | size = min_t(unsigned, 15UL ^ cur_size, max_size); |
719d5a9b | 814 | size = min_t(unsigned, size, PAGE_SIZE - offset_in_page(linear)); |
5cfc7e0f PB |
815 | |
816 | /* | |
817 | * One instruction can only straddle two pages, | |
818 | * and one has been loaded at the beginning of | |
819 | * x86_decode_insn. So, if not enough bytes | |
820 | * still, we must have hit the 15-byte boundary. | |
821 | */ | |
822 | if (unlikely(size < op_size)) | |
fd56e154 PB |
823 | return emulate_gp(ctxt, 0); |
824 | ||
17052f16 | 825 | rc = ctxt->ops->fetch(ctxt, linear, ctxt->fetch.end, |
285ca9e9 PB |
826 | size, &ctxt->exception); |
827 | if (unlikely(rc != X86EMUL_CONTINUE)) | |
828 | return rc; | |
17052f16 | 829 | ctxt->fetch.end += size; |
3e2815e9 | 830 | return X86EMUL_CONTINUE; |
62266869 AK |
831 | } |
832 | ||
9506d57d PB |
833 | static __always_inline int do_insn_fetch_bytes(struct x86_emulate_ctxt *ctxt, |
834 | unsigned size) | |
62266869 | 835 | { |
08da44ae NA |
836 | unsigned done_size = ctxt->fetch.end - ctxt->fetch.ptr; |
837 | ||
838 | if (unlikely(done_size < size)) | |
839 | return __do_insn_fetch_bytes(ctxt, size - done_size); | |
9506d57d PB |
840 | else |
841 | return X86EMUL_CONTINUE; | |
62266869 AK |
842 | } |
843 | ||
67cbc90d | 844 | /* Fetch next part of the instruction being emulated. */ |
e85a1085 | 845 | #define insn_fetch(_type, _ctxt) \ |
9506d57d | 846 | ({ _type _x; \ |
9506d57d PB |
847 | \ |
848 | rc = do_insn_fetch_bytes(_ctxt, sizeof(_type)); \ | |
67cbc90d TY |
849 | if (rc != X86EMUL_CONTINUE) \ |
850 | goto done; \ | |
9506d57d | 851 | ctxt->_eip += sizeof(_type); \ |
17052f16 PB |
852 | _x = *(_type __aligned(1) *) ctxt->fetch.ptr; \ |
853 | ctxt->fetch.ptr += sizeof(_type); \ | |
9506d57d | 854 | _x; \ |
67cbc90d TY |
855 | }) |
856 | ||
807941b1 | 857 | #define insn_fetch_arr(_arr, _size, _ctxt) \ |
9506d57d | 858 | ({ \ |
9506d57d | 859 | rc = do_insn_fetch_bytes(_ctxt, _size); \ |
67cbc90d TY |
860 | if (rc != X86EMUL_CONTINUE) \ |
861 | goto done; \ | |
9506d57d | 862 | ctxt->_eip += (_size); \ |
17052f16 PB |
863 | memcpy(_arr, ctxt->fetch.ptr, _size); \ |
864 | ctxt->fetch.ptr += (_size); \ | |
67cbc90d TY |
865 | }) |
866 | ||
1e3c5cb0 RR |
867 | /* |
868 | * Given the 'reg' portion of a ModRM byte, and a register block, return a | |
869 | * pointer into the block that addresses the relevant register. | |
870 | * @highbyte_regs specifies whether to decode AH,CH,DH,BH. | |
871 | */ | |
dd856efa | 872 | static void *decode_register(struct x86_emulate_ctxt *ctxt, u8 modrm_reg, |
aa9ac1a6 | 873 | int byteop) |
6aa8b732 AK |
874 | { |
875 | void *p; | |
aa9ac1a6 | 876 | int highbyte_regs = (ctxt->rex_prefix == 0) && byteop; |
6aa8b732 | 877 | |
6aa8b732 | 878 | if (highbyte_regs && modrm_reg >= 4 && modrm_reg < 8) |
dd856efa AK |
879 | p = (unsigned char *)reg_rmw(ctxt, modrm_reg & 3) + 1; |
880 | else | |
881 | p = reg_rmw(ctxt, modrm_reg); | |
6aa8b732 AK |
882 | return p; |
883 | } | |
884 | ||
885 | static int read_descriptor(struct x86_emulate_ctxt *ctxt, | |
90de84f5 | 886 | struct segmented_address addr, |
6aa8b732 AK |
887 | u16 *size, unsigned long *address, int op_bytes) |
888 | { | |
889 | int rc; | |
890 | ||
891 | if (op_bytes == 2) | |
892 | op_bytes = 3; | |
893 | *address = 0; | |
3ca3ac4d | 894 | rc = segmented_read_std(ctxt, addr, size, 2); |
1b30eaa8 | 895 | if (rc != X86EMUL_CONTINUE) |
6aa8b732 | 896 | return rc; |
30b31ab6 | 897 | addr.ea += 2; |
3ca3ac4d | 898 | rc = segmented_read_std(ctxt, addr, address, op_bytes); |
6aa8b732 AK |
899 | return rc; |
900 | } | |
901 | ||
34b77652 AK |
902 | FASTOP2(add); |
903 | FASTOP2(or); | |
904 | FASTOP2(adc); | |
905 | FASTOP2(sbb); | |
906 | FASTOP2(and); | |
907 | FASTOP2(sub); | |
908 | FASTOP2(xor); | |
909 | FASTOP2(cmp); | |
910 | FASTOP2(test); | |
911 | ||
b9fa409b AK |
912 | FASTOP1SRC2(mul, mul_ex); |
913 | FASTOP1SRC2(imul, imul_ex); | |
b8c0b6ae AK |
914 | FASTOP1SRC2EX(div, div_ex); |
915 | FASTOP1SRC2EX(idiv, idiv_ex); | |
b9fa409b | 916 | |
34b77652 AK |
917 | FASTOP3WCL(shld); |
918 | FASTOP3WCL(shrd); | |
919 | ||
920 | FASTOP2W(imul); | |
921 | ||
922 | FASTOP1(not); | |
923 | FASTOP1(neg); | |
924 | FASTOP1(inc); | |
925 | FASTOP1(dec); | |
926 | ||
927 | FASTOP2CL(rol); | |
928 | FASTOP2CL(ror); | |
929 | FASTOP2CL(rcl); | |
930 | FASTOP2CL(rcr); | |
931 | FASTOP2CL(shl); | |
932 | FASTOP2CL(shr); | |
933 | FASTOP2CL(sar); | |
934 | ||
935 | FASTOP2W(bsf); | |
936 | FASTOP2W(bsr); | |
937 | FASTOP2W(bt); | |
938 | FASTOP2W(bts); | |
939 | FASTOP2W(btr); | |
940 | FASTOP2W(btc); | |
941 | ||
e47a5f5f AK |
942 | FASTOP2(xadd); |
943 | ||
5aca3722 NA |
944 | FASTOP2R(cmp, cmp_r); |
945 | ||
9ae9feba | 946 | static u8 test_cc(unsigned int condition, unsigned long flags) |
bbe9abbd | 947 | { |
9ae9feba AK |
948 | u8 rc; |
949 | void (*fop)(void) = (void *)em_setcc + 4 * (condition & 0xf); | |
bbe9abbd | 950 | |
9ae9feba | 951 | flags = (flags & EFLAGS_MASK) | X86_EFLAGS_IF; |
3f0c3d0b | 952 | asm("push %[flags]; popf; call *%[fastop]" |
9ae9feba AK |
953 | : "=a"(rc) : [fastop]"r"(fop), [flags]"r"(flags)); |
954 | return rc; | |
bbe9abbd NK |
955 | } |
956 | ||
91ff3cb4 AK |
957 | static void fetch_register_operand(struct operand *op) |
958 | { | |
959 | switch (op->bytes) { | |
960 | case 1: | |
961 | op->val = *(u8 *)op->addr.reg; | |
962 | break; | |
963 | case 2: | |
964 | op->val = *(u16 *)op->addr.reg; | |
965 | break; | |
966 | case 4: | |
967 | op->val = *(u32 *)op->addr.reg; | |
968 | break; | |
969 | case 8: | |
970 | op->val = *(u64 *)op->addr.reg; | |
971 | break; | |
972 | } | |
973 | } | |
974 | ||
1253791d AK |
975 | static void read_sse_reg(struct x86_emulate_ctxt *ctxt, sse128_t *data, int reg) |
976 | { | |
977 | ctxt->ops->get_fpu(ctxt); | |
978 | switch (reg) { | |
89a87c67 MK |
979 | case 0: asm("movdqa %%xmm0, %0" : "=m"(*data)); break; |
980 | case 1: asm("movdqa %%xmm1, %0" : "=m"(*data)); break; | |
981 | case 2: asm("movdqa %%xmm2, %0" : "=m"(*data)); break; | |
982 | case 3: asm("movdqa %%xmm3, %0" : "=m"(*data)); break; | |
983 | case 4: asm("movdqa %%xmm4, %0" : "=m"(*data)); break; | |
984 | case 5: asm("movdqa %%xmm5, %0" : "=m"(*data)); break; | |
985 | case 6: asm("movdqa %%xmm6, %0" : "=m"(*data)); break; | |
986 | case 7: asm("movdqa %%xmm7, %0" : "=m"(*data)); break; | |
1253791d | 987 | #ifdef CONFIG_X86_64 |
89a87c67 MK |
988 | case 8: asm("movdqa %%xmm8, %0" : "=m"(*data)); break; |
989 | case 9: asm("movdqa %%xmm9, %0" : "=m"(*data)); break; | |
990 | case 10: asm("movdqa %%xmm10, %0" : "=m"(*data)); break; | |
991 | case 11: asm("movdqa %%xmm11, %0" : "=m"(*data)); break; | |
992 | case 12: asm("movdqa %%xmm12, %0" : "=m"(*data)); break; | |
993 | case 13: asm("movdqa %%xmm13, %0" : "=m"(*data)); break; | |
994 | case 14: asm("movdqa %%xmm14, %0" : "=m"(*data)); break; | |
995 | case 15: asm("movdqa %%xmm15, %0" : "=m"(*data)); break; | |
1253791d AK |
996 | #endif |
997 | default: BUG(); | |
998 | } | |
999 | ctxt->ops->put_fpu(ctxt); | |
1000 | } | |
1001 | ||
1002 | static void write_sse_reg(struct x86_emulate_ctxt *ctxt, sse128_t *data, | |
1003 | int reg) | |
1004 | { | |
1005 | ctxt->ops->get_fpu(ctxt); | |
1006 | switch (reg) { | |
89a87c67 MK |
1007 | case 0: asm("movdqa %0, %%xmm0" : : "m"(*data)); break; |
1008 | case 1: asm("movdqa %0, %%xmm1" : : "m"(*data)); break; | |
1009 | case 2: asm("movdqa %0, %%xmm2" : : "m"(*data)); break; | |
1010 | case 3: asm("movdqa %0, %%xmm3" : : "m"(*data)); break; | |
1011 | case 4: asm("movdqa %0, %%xmm4" : : "m"(*data)); break; | |
1012 | case 5: asm("movdqa %0, %%xmm5" : : "m"(*data)); break; | |
1013 | case 6: asm("movdqa %0, %%xmm6" : : "m"(*data)); break; | |
1014 | case 7: asm("movdqa %0, %%xmm7" : : "m"(*data)); break; | |
1253791d | 1015 | #ifdef CONFIG_X86_64 |
89a87c67 MK |
1016 | case 8: asm("movdqa %0, %%xmm8" : : "m"(*data)); break; |
1017 | case 9: asm("movdqa %0, %%xmm9" : : "m"(*data)); break; | |
1018 | case 10: asm("movdqa %0, %%xmm10" : : "m"(*data)); break; | |
1019 | case 11: asm("movdqa %0, %%xmm11" : : "m"(*data)); break; | |
1020 | case 12: asm("movdqa %0, %%xmm12" : : "m"(*data)); break; | |
1021 | case 13: asm("movdqa %0, %%xmm13" : : "m"(*data)); break; | |
1022 | case 14: asm("movdqa %0, %%xmm14" : : "m"(*data)); break; | |
1023 | case 15: asm("movdqa %0, %%xmm15" : : "m"(*data)); break; | |
1253791d AK |
1024 | #endif |
1025 | default: BUG(); | |
1026 | } | |
1027 | ctxt->ops->put_fpu(ctxt); | |
1028 | } | |
1029 | ||
cbe2c9d3 AK |
1030 | static void read_mmx_reg(struct x86_emulate_ctxt *ctxt, u64 *data, int reg) |
1031 | { | |
1032 | ctxt->ops->get_fpu(ctxt); | |
1033 | switch (reg) { | |
1034 | case 0: asm("movq %%mm0, %0" : "=m"(*data)); break; | |
1035 | case 1: asm("movq %%mm1, %0" : "=m"(*data)); break; | |
1036 | case 2: asm("movq %%mm2, %0" : "=m"(*data)); break; | |
1037 | case 3: asm("movq %%mm3, %0" : "=m"(*data)); break; | |
1038 | case 4: asm("movq %%mm4, %0" : "=m"(*data)); break; | |
1039 | case 5: asm("movq %%mm5, %0" : "=m"(*data)); break; | |
1040 | case 6: asm("movq %%mm6, %0" : "=m"(*data)); break; | |
1041 | case 7: asm("movq %%mm7, %0" : "=m"(*data)); break; | |
1042 | default: BUG(); | |
1043 | } | |
1044 | ctxt->ops->put_fpu(ctxt); | |
1045 | } | |
1046 | ||
1047 | static void write_mmx_reg(struct x86_emulate_ctxt *ctxt, u64 *data, int reg) | |
1048 | { | |
1049 | ctxt->ops->get_fpu(ctxt); | |
1050 | switch (reg) { | |
1051 | case 0: asm("movq %0, %%mm0" : : "m"(*data)); break; | |
1052 | case 1: asm("movq %0, %%mm1" : : "m"(*data)); break; | |
1053 | case 2: asm("movq %0, %%mm2" : : "m"(*data)); break; | |
1054 | case 3: asm("movq %0, %%mm3" : : "m"(*data)); break; | |
1055 | case 4: asm("movq %0, %%mm4" : : "m"(*data)); break; | |
1056 | case 5: asm("movq %0, %%mm5" : : "m"(*data)); break; | |
1057 | case 6: asm("movq %0, %%mm6" : : "m"(*data)); break; | |
1058 | case 7: asm("movq %0, %%mm7" : : "m"(*data)); break; | |
1059 | default: BUG(); | |
1060 | } | |
1061 | ctxt->ops->put_fpu(ctxt); | |
1062 | } | |
1063 | ||
045a282c GN |
1064 | static int em_fninit(struct x86_emulate_ctxt *ctxt) |
1065 | { | |
1066 | if (ctxt->ops->get_cr(ctxt, 0) & (X86_CR0_TS | X86_CR0_EM)) | |
1067 | return emulate_nm(ctxt); | |
1068 | ||
1069 | ctxt->ops->get_fpu(ctxt); | |
1070 | asm volatile("fninit"); | |
1071 | ctxt->ops->put_fpu(ctxt); | |
1072 | return X86EMUL_CONTINUE; | |
1073 | } | |
1074 | ||
1075 | static int em_fnstcw(struct x86_emulate_ctxt *ctxt) | |
1076 | { | |
1077 | u16 fcw; | |
1078 | ||
1079 | if (ctxt->ops->get_cr(ctxt, 0) & (X86_CR0_TS | X86_CR0_EM)) | |
1080 | return emulate_nm(ctxt); | |
1081 | ||
1082 | ctxt->ops->get_fpu(ctxt); | |
1083 | asm volatile("fnstcw %0": "+m"(fcw)); | |
1084 | ctxt->ops->put_fpu(ctxt); | |
1085 | ||
045a282c GN |
1086 | ctxt->dst.val = fcw; |
1087 | ||
1088 | return X86EMUL_CONTINUE; | |
1089 | } | |
1090 | ||
1091 | static int em_fnstsw(struct x86_emulate_ctxt *ctxt) | |
1092 | { | |
1093 | u16 fsw; | |
1094 | ||
1095 | if (ctxt->ops->get_cr(ctxt, 0) & (X86_CR0_TS | X86_CR0_EM)) | |
1096 | return emulate_nm(ctxt); | |
1097 | ||
1098 | ctxt->ops->get_fpu(ctxt); | |
1099 | asm volatile("fnstsw %0": "+m"(fsw)); | |
1100 | ctxt->ops->put_fpu(ctxt); | |
1101 | ||
045a282c GN |
1102 | ctxt->dst.val = fsw; |
1103 | ||
1104 | return X86EMUL_CONTINUE; | |
1105 | } | |
1106 | ||
1253791d | 1107 | static void decode_register_operand(struct x86_emulate_ctxt *ctxt, |
2adb5ad9 | 1108 | struct operand *op) |
3c118e24 | 1109 | { |
9dac77fa | 1110 | unsigned reg = ctxt->modrm_reg; |
33615aa9 | 1111 | |
9dac77fa AK |
1112 | if (!(ctxt->d & ModRM)) |
1113 | reg = (ctxt->b & 7) | ((ctxt->rex_prefix & 1) << 3); | |
1253791d | 1114 | |
9dac77fa | 1115 | if (ctxt->d & Sse) { |
1253791d AK |
1116 | op->type = OP_XMM; |
1117 | op->bytes = 16; | |
1118 | op->addr.xmm = reg; | |
1119 | read_sse_reg(ctxt, &op->vec_val, reg); | |
1120 | return; | |
1121 | } | |
cbe2c9d3 AK |
1122 | if (ctxt->d & Mmx) { |
1123 | reg &= 7; | |
1124 | op->type = OP_MM; | |
1125 | op->bytes = 8; | |
1126 | op->addr.mm = reg; | |
1127 | return; | |
1128 | } | |
1253791d | 1129 | |
3c118e24 | 1130 | op->type = OP_REG; |
6d4d85ec GN |
1131 | op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; |
1132 | op->addr.reg = decode_register(ctxt, reg, ctxt->d & ByteOp); | |
1133 | ||
91ff3cb4 | 1134 | fetch_register_operand(op); |
3c118e24 AK |
1135 | op->orig_val = op->val; |
1136 | } | |
1137 | ||
a6e3407b AK |
1138 | static void adjust_modrm_seg(struct x86_emulate_ctxt *ctxt, int base_reg) |
1139 | { | |
1140 | if (base_reg == VCPU_REGS_RSP || base_reg == VCPU_REGS_RBP) | |
1141 | ctxt->modrm_seg = VCPU_SREG_SS; | |
1142 | } | |
1143 | ||
1c73ef66 | 1144 | static int decode_modrm(struct x86_emulate_ctxt *ctxt, |
2dbd0dd7 | 1145 | struct operand *op) |
1c73ef66 | 1146 | { |
1c73ef66 | 1147 | u8 sib; |
02357bdc | 1148 | int index_reg, base_reg, scale; |
3e2815e9 | 1149 | int rc = X86EMUL_CONTINUE; |
2dbd0dd7 | 1150 | ulong modrm_ea = 0; |
1c73ef66 | 1151 | |
02357bdc BD |
1152 | ctxt->modrm_reg = ((ctxt->rex_prefix << 1) & 8); /* REX.R */ |
1153 | index_reg = (ctxt->rex_prefix << 2) & 8; /* REX.X */ | |
1154 | base_reg = (ctxt->rex_prefix << 3) & 8; /* REX.B */ | |
1c73ef66 | 1155 | |
02357bdc | 1156 | ctxt->modrm_mod = (ctxt->modrm & 0xc0) >> 6; |
9dac77fa | 1157 | ctxt->modrm_reg |= (ctxt->modrm & 0x38) >> 3; |
02357bdc | 1158 | ctxt->modrm_rm = base_reg | (ctxt->modrm & 0x07); |
9dac77fa | 1159 | ctxt->modrm_seg = VCPU_SREG_DS; |
1c73ef66 | 1160 | |
9b88ae99 | 1161 | if (ctxt->modrm_mod == 3 || (ctxt->d & NoMod)) { |
2dbd0dd7 | 1162 | op->type = OP_REG; |
9dac77fa | 1163 | op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; |
8acb4207 | 1164 | op->addr.reg = decode_register(ctxt, ctxt->modrm_rm, |
aa9ac1a6 | 1165 | ctxt->d & ByteOp); |
9dac77fa | 1166 | if (ctxt->d & Sse) { |
1253791d AK |
1167 | op->type = OP_XMM; |
1168 | op->bytes = 16; | |
9dac77fa AK |
1169 | op->addr.xmm = ctxt->modrm_rm; |
1170 | read_sse_reg(ctxt, &op->vec_val, ctxt->modrm_rm); | |
1253791d AK |
1171 | return rc; |
1172 | } | |
cbe2c9d3 AK |
1173 | if (ctxt->d & Mmx) { |
1174 | op->type = OP_MM; | |
1175 | op->bytes = 8; | |
bdc90722 | 1176 | op->addr.mm = ctxt->modrm_rm & 7; |
cbe2c9d3 AK |
1177 | return rc; |
1178 | } | |
2dbd0dd7 | 1179 | fetch_register_operand(op); |
1c73ef66 AK |
1180 | return rc; |
1181 | } | |
1182 | ||
2dbd0dd7 AK |
1183 | op->type = OP_MEM; |
1184 | ||
9dac77fa | 1185 | if (ctxt->ad_bytes == 2) { |
dd856efa AK |
1186 | unsigned bx = reg_read(ctxt, VCPU_REGS_RBX); |
1187 | unsigned bp = reg_read(ctxt, VCPU_REGS_RBP); | |
1188 | unsigned si = reg_read(ctxt, VCPU_REGS_RSI); | |
1189 | unsigned di = reg_read(ctxt, VCPU_REGS_RDI); | |
1c73ef66 AK |
1190 | |
1191 | /* 16-bit ModR/M decode. */ | |
9dac77fa | 1192 | switch (ctxt->modrm_mod) { |
1c73ef66 | 1193 | case 0: |
9dac77fa | 1194 | if (ctxt->modrm_rm == 6) |
e85a1085 | 1195 | modrm_ea += insn_fetch(u16, ctxt); |
1c73ef66 AK |
1196 | break; |
1197 | case 1: | |
e85a1085 | 1198 | modrm_ea += insn_fetch(s8, ctxt); |
1c73ef66 AK |
1199 | break; |
1200 | case 2: | |
e85a1085 | 1201 | modrm_ea += insn_fetch(u16, ctxt); |
1c73ef66 AK |
1202 | break; |
1203 | } | |
9dac77fa | 1204 | switch (ctxt->modrm_rm) { |
1c73ef66 | 1205 | case 0: |
2dbd0dd7 | 1206 | modrm_ea += bx + si; |
1c73ef66 AK |
1207 | break; |
1208 | case 1: | |
2dbd0dd7 | 1209 | modrm_ea += bx + di; |
1c73ef66 AK |
1210 | break; |
1211 | case 2: | |
2dbd0dd7 | 1212 | modrm_ea += bp + si; |
1c73ef66 AK |
1213 | break; |
1214 | case 3: | |
2dbd0dd7 | 1215 | modrm_ea += bp + di; |
1c73ef66 AK |
1216 | break; |
1217 | case 4: | |
2dbd0dd7 | 1218 | modrm_ea += si; |
1c73ef66 AK |
1219 | break; |
1220 | case 5: | |
2dbd0dd7 | 1221 | modrm_ea += di; |
1c73ef66 AK |
1222 | break; |
1223 | case 6: | |
9dac77fa | 1224 | if (ctxt->modrm_mod != 0) |
2dbd0dd7 | 1225 | modrm_ea += bp; |
1c73ef66 AK |
1226 | break; |
1227 | case 7: | |
2dbd0dd7 | 1228 | modrm_ea += bx; |
1c73ef66 AK |
1229 | break; |
1230 | } | |
9dac77fa AK |
1231 | if (ctxt->modrm_rm == 2 || ctxt->modrm_rm == 3 || |
1232 | (ctxt->modrm_rm == 6 && ctxt->modrm_mod != 0)) | |
1233 | ctxt->modrm_seg = VCPU_SREG_SS; | |
2dbd0dd7 | 1234 | modrm_ea = (u16)modrm_ea; |
1c73ef66 AK |
1235 | } else { |
1236 | /* 32/64-bit ModR/M decode. */ | |
9dac77fa | 1237 | if ((ctxt->modrm_rm & 7) == 4) { |
e85a1085 | 1238 | sib = insn_fetch(u8, ctxt); |
1c73ef66 AK |
1239 | index_reg |= (sib >> 3) & 7; |
1240 | base_reg |= sib & 7; | |
1241 | scale = sib >> 6; | |
1242 | ||
9dac77fa | 1243 | if ((base_reg & 7) == 5 && ctxt->modrm_mod == 0) |
e85a1085 | 1244 | modrm_ea += insn_fetch(s32, ctxt); |
a6e3407b | 1245 | else { |
dd856efa | 1246 | modrm_ea += reg_read(ctxt, base_reg); |
a6e3407b | 1247 | adjust_modrm_seg(ctxt, base_reg); |
ab708099 NA |
1248 | /* Increment ESP on POP [ESP] */ |
1249 | if ((ctxt->d & IncSP) && | |
1250 | base_reg == VCPU_REGS_RSP) | |
1251 | modrm_ea += ctxt->op_bytes; | |
a6e3407b | 1252 | } |
dc71d0f1 | 1253 | if (index_reg != 4) |
dd856efa | 1254 | modrm_ea += reg_read(ctxt, index_reg) << scale; |
9dac77fa | 1255 | } else if ((ctxt->modrm_rm & 7) == 5 && ctxt->modrm_mod == 0) { |
5b38ab87 | 1256 | modrm_ea += insn_fetch(s32, ctxt); |
84411d85 | 1257 | if (ctxt->mode == X86EMUL_MODE_PROT64) |
9dac77fa | 1258 | ctxt->rip_relative = 1; |
a6e3407b AK |
1259 | } else { |
1260 | base_reg = ctxt->modrm_rm; | |
dd856efa | 1261 | modrm_ea += reg_read(ctxt, base_reg); |
a6e3407b AK |
1262 | adjust_modrm_seg(ctxt, base_reg); |
1263 | } | |
9dac77fa | 1264 | switch (ctxt->modrm_mod) { |
1c73ef66 | 1265 | case 1: |
e85a1085 | 1266 | modrm_ea += insn_fetch(s8, ctxt); |
1c73ef66 AK |
1267 | break; |
1268 | case 2: | |
e85a1085 | 1269 | modrm_ea += insn_fetch(s32, ctxt); |
1c73ef66 AK |
1270 | break; |
1271 | } | |
1272 | } | |
90de84f5 | 1273 | op->addr.mem.ea = modrm_ea; |
41061cdb BD |
1274 | if (ctxt->ad_bytes != 8) |
1275 | ctxt->memop.addr.mem.ea = (u32)ctxt->memop.addr.mem.ea; | |
1276 | ||
1c73ef66 AK |
1277 | done: |
1278 | return rc; | |
1279 | } | |
1280 | ||
1281 | static int decode_abs(struct x86_emulate_ctxt *ctxt, | |
2dbd0dd7 | 1282 | struct operand *op) |
1c73ef66 | 1283 | { |
3e2815e9 | 1284 | int rc = X86EMUL_CONTINUE; |
1c73ef66 | 1285 | |
2dbd0dd7 | 1286 | op->type = OP_MEM; |
9dac77fa | 1287 | switch (ctxt->ad_bytes) { |
1c73ef66 | 1288 | case 2: |
e85a1085 | 1289 | op->addr.mem.ea = insn_fetch(u16, ctxt); |
1c73ef66 AK |
1290 | break; |
1291 | case 4: | |
e85a1085 | 1292 | op->addr.mem.ea = insn_fetch(u32, ctxt); |
1c73ef66 AK |
1293 | break; |
1294 | case 8: | |
e85a1085 | 1295 | op->addr.mem.ea = insn_fetch(u64, ctxt); |
1c73ef66 AK |
1296 | break; |
1297 | } | |
1298 | done: | |
1299 | return rc; | |
1300 | } | |
1301 | ||
9dac77fa | 1302 | static void fetch_bit_operand(struct x86_emulate_ctxt *ctxt) |
35c843c4 | 1303 | { |
7129eeca | 1304 | long sv = 0, mask; |
35c843c4 | 1305 | |
9dac77fa | 1306 | if (ctxt->dst.type == OP_MEM && ctxt->src.type == OP_REG) { |
7dec5603 | 1307 | mask = ~((long)ctxt->dst.bytes * 8 - 1); |
35c843c4 | 1308 | |
9dac77fa AK |
1309 | if (ctxt->src.bytes == 2) |
1310 | sv = (s16)ctxt->src.val & (s16)mask; | |
1311 | else if (ctxt->src.bytes == 4) | |
1312 | sv = (s32)ctxt->src.val & (s32)mask; | |
7dec5603 NA |
1313 | else |
1314 | sv = (s64)ctxt->src.val & (s64)mask; | |
35c843c4 | 1315 | |
1c1c35ae NA |
1316 | ctxt->dst.addr.mem.ea = address_mask(ctxt, |
1317 | ctxt->dst.addr.mem.ea + (sv >> 3)); | |
35c843c4 | 1318 | } |
ba7ff2b7 WY |
1319 | |
1320 | /* only subword offset */ | |
9dac77fa | 1321 | ctxt->src.val &= (ctxt->dst.bytes << 3) - 1; |
35c843c4 WY |
1322 | } |
1323 | ||
dde7e6d1 | 1324 | static int read_emulated(struct x86_emulate_ctxt *ctxt, |
dde7e6d1 | 1325 | unsigned long addr, void *dest, unsigned size) |
6aa8b732 | 1326 | { |
dde7e6d1 | 1327 | int rc; |
9dac77fa | 1328 | struct read_cache *mc = &ctxt->mem_read; |
6aa8b732 | 1329 | |
f23b070e XG |
1330 | if (mc->pos < mc->end) |
1331 | goto read_cached; | |
6aa8b732 | 1332 | |
f23b070e XG |
1333 | WARN_ON((mc->end + size) >= sizeof(mc->data)); |
1334 | ||
1335 | rc = ctxt->ops->read_emulated(ctxt, addr, mc->data + mc->end, size, | |
1336 | &ctxt->exception); | |
1337 | if (rc != X86EMUL_CONTINUE) | |
1338 | return rc; | |
1339 | ||
1340 | mc->end += size; | |
1341 | ||
1342 | read_cached: | |
1343 | memcpy(dest, mc->data + mc->pos, size); | |
1344 | mc->pos += size; | |
dde7e6d1 AK |
1345 | return X86EMUL_CONTINUE; |
1346 | } | |
6aa8b732 | 1347 | |
3ca3ac4d AK |
1348 | static int segmented_read(struct x86_emulate_ctxt *ctxt, |
1349 | struct segmented_address addr, | |
1350 | void *data, | |
1351 | unsigned size) | |
1352 | { | |
9fa088f4 AK |
1353 | int rc; |
1354 | ulong linear; | |
1355 | ||
83b8795a | 1356 | rc = linearize(ctxt, addr, size, false, &linear); |
9fa088f4 AK |
1357 | if (rc != X86EMUL_CONTINUE) |
1358 | return rc; | |
7b105ca2 | 1359 | return read_emulated(ctxt, linear, data, size); |
3ca3ac4d AK |
1360 | } |
1361 | ||
1362 | static int segmented_write(struct x86_emulate_ctxt *ctxt, | |
1363 | struct segmented_address addr, | |
1364 | const void *data, | |
1365 | unsigned size) | |
1366 | { | |
9fa088f4 AK |
1367 | int rc; |
1368 | ulong linear; | |
1369 | ||
83b8795a | 1370 | rc = linearize(ctxt, addr, size, true, &linear); |
9fa088f4 AK |
1371 | if (rc != X86EMUL_CONTINUE) |
1372 | return rc; | |
0f65dd70 AK |
1373 | return ctxt->ops->write_emulated(ctxt, linear, data, size, |
1374 | &ctxt->exception); | |
3ca3ac4d AK |
1375 | } |
1376 | ||
1377 | static int segmented_cmpxchg(struct x86_emulate_ctxt *ctxt, | |
1378 | struct segmented_address addr, | |
1379 | const void *orig_data, const void *data, | |
1380 | unsigned size) | |
1381 | { | |
9fa088f4 AK |
1382 | int rc; |
1383 | ulong linear; | |
1384 | ||
83b8795a | 1385 | rc = linearize(ctxt, addr, size, true, &linear); |
9fa088f4 AK |
1386 | if (rc != X86EMUL_CONTINUE) |
1387 | return rc; | |
0f65dd70 AK |
1388 | return ctxt->ops->cmpxchg_emulated(ctxt, linear, orig_data, data, |
1389 | size, &ctxt->exception); | |
3ca3ac4d AK |
1390 | } |
1391 | ||
dde7e6d1 | 1392 | static int pio_in_emulated(struct x86_emulate_ctxt *ctxt, |
dde7e6d1 AK |
1393 | unsigned int size, unsigned short port, |
1394 | void *dest) | |
1395 | { | |
9dac77fa | 1396 | struct read_cache *rc = &ctxt->io_read; |
b4c6abfe | 1397 | |
dde7e6d1 | 1398 | if (rc->pos == rc->end) { /* refill pio read ahead */ |
dde7e6d1 | 1399 | unsigned int in_page, n; |
9dac77fa | 1400 | unsigned int count = ctxt->rep_prefix ? |
dd856efa | 1401 | address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) : 1; |
dde7e6d1 | 1402 | in_page = (ctxt->eflags & EFLG_DF) ? |
dd856efa AK |
1403 | offset_in_page(reg_read(ctxt, VCPU_REGS_RDI)) : |
1404 | PAGE_SIZE - offset_in_page(reg_read(ctxt, VCPU_REGS_RDI)); | |
b55a8144 | 1405 | n = min3(in_page, (unsigned int)sizeof(rc->data) / size, count); |
dde7e6d1 AK |
1406 | if (n == 0) |
1407 | n = 1; | |
1408 | rc->pos = rc->end = 0; | |
7b105ca2 | 1409 | if (!ctxt->ops->pio_in_emulated(ctxt, size, port, rc->data, n)) |
dde7e6d1 AK |
1410 | return 0; |
1411 | rc->end = n * size; | |
6aa8b732 AK |
1412 | } |
1413 | ||
e6e39f04 NA |
1414 | if (ctxt->rep_prefix && (ctxt->d & String) && |
1415 | !(ctxt->eflags & EFLG_DF)) { | |
b3356bf0 GN |
1416 | ctxt->dst.data = rc->data + rc->pos; |
1417 | ctxt->dst.type = OP_MEM_STR; | |
1418 | ctxt->dst.count = (rc->end - rc->pos) / size; | |
1419 | rc->pos = rc->end; | |
1420 | } else { | |
1421 | memcpy(dest, rc->data + rc->pos, size); | |
1422 | rc->pos += size; | |
1423 | } | |
dde7e6d1 AK |
1424 | return 1; |
1425 | } | |
6aa8b732 | 1426 | |
7f3d35fd KW |
1427 | static int read_interrupt_descriptor(struct x86_emulate_ctxt *ctxt, |
1428 | u16 index, struct desc_struct *desc) | |
1429 | { | |
1430 | struct desc_ptr dt; | |
1431 | ulong addr; | |
1432 | ||
1433 | ctxt->ops->get_idt(ctxt, &dt); | |
1434 | ||
1435 | if (dt.size < index * 8 + 7) | |
1436 | return emulate_gp(ctxt, index << 3 | 0x2); | |
1437 | ||
1438 | addr = dt.address + index * 8; | |
1439 | return ctxt->ops->read_std(ctxt, addr, desc, sizeof *desc, | |
1440 | &ctxt->exception); | |
1441 | } | |
1442 | ||
dde7e6d1 | 1443 | static void get_descriptor_table_ptr(struct x86_emulate_ctxt *ctxt, |
dde7e6d1 AK |
1444 | u16 selector, struct desc_ptr *dt) |
1445 | { | |
0225fb50 | 1446 | const struct x86_emulate_ops *ops = ctxt->ops; |
2eedcac8 | 1447 | u32 base3 = 0; |
7b105ca2 | 1448 | |
dde7e6d1 AK |
1449 | if (selector & 1 << 2) { |
1450 | struct desc_struct desc; | |
1aa36616 AK |
1451 | u16 sel; |
1452 | ||
dde7e6d1 | 1453 | memset (dt, 0, sizeof *dt); |
2eedcac8 NA |
1454 | if (!ops->get_segment(ctxt, &sel, &desc, &base3, |
1455 | VCPU_SREG_LDTR)) | |
dde7e6d1 | 1456 | return; |
e09d082c | 1457 | |
dde7e6d1 | 1458 | dt->size = desc_limit_scaled(&desc); /* what if limit > 65535? */ |
2eedcac8 | 1459 | dt->address = get_desc_base(&desc) | ((u64)base3 << 32); |
dde7e6d1 | 1460 | } else |
4bff1e86 | 1461 | ops->get_gdt(ctxt, dt); |
dde7e6d1 | 1462 | } |
120df890 | 1463 | |
edccda7c NA |
1464 | static int get_descriptor_ptr(struct x86_emulate_ctxt *ctxt, |
1465 | u16 selector, ulong *desc_addr_p) | |
dde7e6d1 AK |
1466 | { |
1467 | struct desc_ptr dt; | |
1468 | u16 index = selector >> 3; | |
dde7e6d1 | 1469 | ulong addr; |
120df890 | 1470 | |
7b105ca2 | 1471 | get_descriptor_table_ptr(ctxt, selector, &dt); |
120df890 | 1472 | |
35d3d4a1 AK |
1473 | if (dt.size < index * 8 + 7) |
1474 | return emulate_gp(ctxt, selector & 0xfffc); | |
e09d082c | 1475 | |
edccda7c NA |
1476 | addr = dt.address + index * 8; |
1477 | ||
1478 | #ifdef CONFIG_X86_64 | |
1479 | if (addr >> 32 != 0) { | |
1480 | u64 efer = 0; | |
1481 | ||
1482 | ctxt->ops->get_msr(ctxt, MSR_EFER, &efer); | |
1483 | if (!(efer & EFER_LMA)) | |
1484 | addr &= (u32)-1; | |
1485 | } | |
1486 | #endif | |
1487 | ||
1488 | *desc_addr_p = addr; | |
1489 | return X86EMUL_CONTINUE; | |
1490 | } | |
1491 | ||
1492 | /* allowed just for 8 bytes segments */ | |
1493 | static int read_segment_descriptor(struct x86_emulate_ctxt *ctxt, | |
1494 | u16 selector, struct desc_struct *desc, | |
1495 | ulong *desc_addr_p) | |
1496 | { | |
1497 | int rc; | |
1498 | ||
1499 | rc = get_descriptor_ptr(ctxt, selector, desc_addr_p); | |
1500 | if (rc != X86EMUL_CONTINUE) | |
1501 | return rc; | |
1502 | ||
1503 | return ctxt->ops->read_std(ctxt, *desc_addr_p, desc, sizeof(*desc), | |
7b105ca2 | 1504 | &ctxt->exception); |
dde7e6d1 | 1505 | } |
ef65c889 | 1506 | |
dde7e6d1 AK |
1507 | /* allowed just for 8 bytes segments */ |
1508 | static int write_segment_descriptor(struct x86_emulate_ctxt *ctxt, | |
dde7e6d1 AK |
1509 | u16 selector, struct desc_struct *desc) |
1510 | { | |
edccda7c | 1511 | int rc; |
dde7e6d1 | 1512 | ulong addr; |
6aa8b732 | 1513 | |
edccda7c NA |
1514 | rc = get_descriptor_ptr(ctxt, selector, &addr); |
1515 | if (rc != X86EMUL_CONTINUE) | |
1516 | return rc; | |
6aa8b732 | 1517 | |
7b105ca2 TY |
1518 | return ctxt->ops->write_std(ctxt, addr, desc, sizeof *desc, |
1519 | &ctxt->exception); | |
dde7e6d1 | 1520 | } |
c7e75a3d | 1521 | |
5601d05b | 1522 | /* Does not support long mode */ |
2356aaeb | 1523 | static int __load_segment_descriptor(struct x86_emulate_ctxt *ctxt, |
d1442d85 | 1524 | u16 selector, int seg, u8 cpl, |
3dc4bc4f | 1525 | enum x86_transfer_type transfer, |
d1442d85 | 1526 | struct desc_struct *desc) |
dde7e6d1 | 1527 | { |
869be99c | 1528 | struct desc_struct seg_desc, old_desc; |
2356aaeb | 1529 | u8 dpl, rpl; |
dde7e6d1 AK |
1530 | unsigned err_vec = GP_VECTOR; |
1531 | u32 err_code = 0; | |
1532 | bool null_selector = !(selector & ~0x3); /* 0000-0003 are null */ | |
e919464b | 1533 | ulong desc_addr; |
dde7e6d1 | 1534 | int ret; |
03ebebeb | 1535 | u16 dummy; |
e37a75a1 | 1536 | u32 base3 = 0; |
69f55cb1 | 1537 | |
dde7e6d1 | 1538 | memset(&seg_desc, 0, sizeof seg_desc); |
69f55cb1 | 1539 | |
f8da94e9 KW |
1540 | if (ctxt->mode == X86EMUL_MODE_REAL) { |
1541 | /* set real mode segment descriptor (keep limit etc. for | |
1542 | * unreal mode) */ | |
03ebebeb | 1543 | ctxt->ops->get_segment(ctxt, &dummy, &seg_desc, NULL, seg); |
dde7e6d1 | 1544 | set_desc_base(&seg_desc, selector << 4); |
dde7e6d1 | 1545 | goto load; |
f8da94e9 KW |
1546 | } else if (seg <= VCPU_SREG_GS && ctxt->mode == X86EMUL_MODE_VM86) { |
1547 | /* VM86 needs a clean new segment descriptor */ | |
1548 | set_desc_base(&seg_desc, selector << 4); | |
1549 | set_desc_limit(&seg_desc, 0xffff); | |
1550 | seg_desc.type = 3; | |
1551 | seg_desc.p = 1; | |
1552 | seg_desc.s = 1; | |
1553 | seg_desc.dpl = 3; | |
1554 | goto load; | |
dde7e6d1 AK |
1555 | } |
1556 | ||
79d5b4c3 | 1557 | rpl = selector & 3; |
79d5b4c3 AK |
1558 | |
1559 | /* NULL selector is not valid for TR, CS and SS (except for long mode) */ | |
1560 | if ((seg == VCPU_SREG_CS | |
1561 | || (seg == VCPU_SREG_SS | |
1562 | && (ctxt->mode != X86EMUL_MODE_PROT64 || rpl != cpl)) | |
1563 | || seg == VCPU_SREG_TR) | |
dde7e6d1 AK |
1564 | && null_selector) |
1565 | goto exception; | |
1566 | ||
1567 | /* TR should be in GDT only */ | |
1568 | if (seg == VCPU_SREG_TR && (selector & (1 << 2))) | |
1569 | goto exception; | |
1570 | ||
1571 | if (null_selector) /* for NULL selector skip all following checks */ | |
1572 | goto load; | |
1573 | ||
e919464b | 1574 | ret = read_segment_descriptor(ctxt, selector, &seg_desc, &desc_addr); |
dde7e6d1 AK |
1575 | if (ret != X86EMUL_CONTINUE) |
1576 | return ret; | |
1577 | ||
1578 | err_code = selector & 0xfffc; | |
3dc4bc4f NA |
1579 | err_vec = (transfer == X86_TRANSFER_TASK_SWITCH) ? TS_VECTOR : |
1580 | GP_VECTOR; | |
dde7e6d1 | 1581 | |
fc058680 | 1582 | /* can't load system descriptor into segment selector */ |
3dc4bc4f NA |
1583 | if (seg <= VCPU_SREG_GS && !seg_desc.s) { |
1584 | if (transfer == X86_TRANSFER_CALL_JMP) | |
1585 | return X86EMUL_UNHANDLEABLE; | |
dde7e6d1 | 1586 | goto exception; |
3dc4bc4f | 1587 | } |
dde7e6d1 AK |
1588 | |
1589 | if (!seg_desc.p) { | |
1590 | err_vec = (seg == VCPU_SREG_SS) ? SS_VECTOR : NP_VECTOR; | |
1591 | goto exception; | |
1592 | } | |
1593 | ||
dde7e6d1 | 1594 | dpl = seg_desc.dpl; |
dde7e6d1 AK |
1595 | |
1596 | switch (seg) { | |
1597 | case VCPU_SREG_SS: | |
1598 | /* | |
1599 | * segment is not a writable data segment or segment | |
1600 | * selector's RPL != CPL or segment selector's RPL != CPL | |
1601 | */ | |
1602 | if (rpl != cpl || (seg_desc.type & 0xa) != 0x2 || dpl != cpl) | |
1603 | goto exception; | |
6aa8b732 | 1604 | break; |
dde7e6d1 AK |
1605 | case VCPU_SREG_CS: |
1606 | if (!(seg_desc.type & 8)) | |
1607 | goto exception; | |
1608 | ||
1609 | if (seg_desc.type & 4) { | |
1610 | /* conforming */ | |
1611 | if (dpl > cpl) | |
1612 | goto exception; | |
1613 | } else { | |
1614 | /* nonconforming */ | |
1615 | if (rpl > cpl || dpl != cpl) | |
1616 | goto exception; | |
1617 | } | |
040c8dc8 NA |
1618 | /* in long-mode d/b must be clear if l is set */ |
1619 | if (seg_desc.d && seg_desc.l) { | |
1620 | u64 efer = 0; | |
1621 | ||
1622 | ctxt->ops->get_msr(ctxt, MSR_EFER, &efer); | |
1623 | if (efer & EFER_LMA) | |
1624 | goto exception; | |
1625 | } | |
1626 | ||
dde7e6d1 AK |
1627 | /* CS(RPL) <- CPL */ |
1628 | selector = (selector & 0xfffc) | cpl; | |
6aa8b732 | 1629 | break; |
dde7e6d1 AK |
1630 | case VCPU_SREG_TR: |
1631 | if (seg_desc.s || (seg_desc.type != 1 && seg_desc.type != 9)) | |
1632 | goto exception; | |
869be99c AK |
1633 | old_desc = seg_desc; |
1634 | seg_desc.type |= 2; /* busy */ | |
1635 | ret = ctxt->ops->cmpxchg_emulated(ctxt, desc_addr, &old_desc, &seg_desc, | |
1636 | sizeof(seg_desc), &ctxt->exception); | |
1637 | if (ret != X86EMUL_CONTINUE) | |
1638 | return ret; | |
dde7e6d1 AK |
1639 | break; |
1640 | case VCPU_SREG_LDTR: | |
1641 | if (seg_desc.s || seg_desc.type != 2) | |
1642 | goto exception; | |
1643 | break; | |
1644 | default: /* DS, ES, FS, or GS */ | |
4e62417b | 1645 | /* |
dde7e6d1 AK |
1646 | * segment is not a data or readable code segment or |
1647 | * ((segment is a data or nonconforming code segment) | |
1648 | * and (both RPL and CPL > DPL)) | |
4e62417b | 1649 | */ |
dde7e6d1 AK |
1650 | if ((seg_desc.type & 0xa) == 0x8 || |
1651 | (((seg_desc.type & 0xc) != 0xc) && | |
1652 | (rpl > dpl && cpl > dpl))) | |
1653 | goto exception; | |
6aa8b732 | 1654 | break; |
dde7e6d1 AK |
1655 | } |
1656 | ||
1657 | if (seg_desc.s) { | |
1658 | /* mark segment as accessed */ | |
e2cefa74 NA |
1659 | if (!(seg_desc.type & 1)) { |
1660 | seg_desc.type |= 1; | |
1661 | ret = write_segment_descriptor(ctxt, selector, | |
1662 | &seg_desc); | |
1663 | if (ret != X86EMUL_CONTINUE) | |
1664 | return ret; | |
1665 | } | |
e37a75a1 NA |
1666 | } else if (ctxt->mode == X86EMUL_MODE_PROT64) { |
1667 | ret = ctxt->ops->read_std(ctxt, desc_addr+8, &base3, | |
1668 | sizeof(base3), &ctxt->exception); | |
1669 | if (ret != X86EMUL_CONTINUE) | |
1670 | return ret; | |
9a9abf6b NA |
1671 | if (is_noncanonical_address(get_desc_base(&seg_desc) | |
1672 | ((u64)base3 << 32))) | |
1673 | return emulate_gp(ctxt, 0); | |
dde7e6d1 AK |
1674 | } |
1675 | load: | |
e37a75a1 | 1676 | ctxt->ops->set_segment(ctxt, selector, &seg_desc, base3, seg); |
d1442d85 NA |
1677 | if (desc) |
1678 | *desc = seg_desc; | |
dde7e6d1 AK |
1679 | return X86EMUL_CONTINUE; |
1680 | exception: | |
592f0858 | 1681 | return emulate_exception(ctxt, err_vec, err_code, true); |
dde7e6d1 AK |
1682 | } |
1683 | ||
2356aaeb PB |
1684 | static int load_segment_descriptor(struct x86_emulate_ctxt *ctxt, |
1685 | u16 selector, int seg) | |
1686 | { | |
1687 | u8 cpl = ctxt->ops->cpl(ctxt); | |
3dc4bc4f NA |
1688 | return __load_segment_descriptor(ctxt, selector, seg, cpl, |
1689 | X86_TRANSFER_NONE, NULL); | |
2356aaeb PB |
1690 | } |
1691 | ||
31be40b3 WY |
1692 | static void write_register_operand(struct operand *op) |
1693 | { | |
1694 | /* The 4-byte case *is* correct: in 64-bit mode we zero-extend. */ | |
1695 | switch (op->bytes) { | |
1696 | case 1: | |
1697 | *(u8 *)op->addr.reg = (u8)op->val; | |
1698 | break; | |
1699 | case 2: | |
1700 | *(u16 *)op->addr.reg = (u16)op->val; | |
1701 | break; | |
1702 | case 4: | |
1703 | *op->addr.reg = (u32)op->val; | |
1704 | break; /* 64b: zero-extend */ | |
1705 | case 8: | |
1706 | *op->addr.reg = op->val; | |
1707 | break; | |
1708 | } | |
1709 | } | |
1710 | ||
fb32b1ed | 1711 | static int writeback(struct x86_emulate_ctxt *ctxt, struct operand *op) |
dde7e6d1 | 1712 | { |
fb32b1ed | 1713 | switch (op->type) { |
dde7e6d1 | 1714 | case OP_REG: |
fb32b1ed | 1715 | write_register_operand(op); |
6aa8b732 | 1716 | break; |
dde7e6d1 | 1717 | case OP_MEM: |
9dac77fa | 1718 | if (ctxt->lock_prefix) |
f5f87dfb PB |
1719 | return segmented_cmpxchg(ctxt, |
1720 | op->addr.mem, | |
1721 | &op->orig_val, | |
1722 | &op->val, | |
1723 | op->bytes); | |
1724 | else | |
1725 | return segmented_write(ctxt, | |
fb32b1ed | 1726 | op->addr.mem, |
fb32b1ed AK |
1727 | &op->val, |
1728 | op->bytes); | |
a682e354 | 1729 | break; |
b3356bf0 | 1730 | case OP_MEM_STR: |
f5f87dfb PB |
1731 | return segmented_write(ctxt, |
1732 | op->addr.mem, | |
1733 | op->data, | |
1734 | op->bytes * op->count); | |
b3356bf0 | 1735 | break; |
1253791d | 1736 | case OP_XMM: |
fb32b1ed | 1737 | write_sse_reg(ctxt, &op->vec_val, op->addr.xmm); |
1253791d | 1738 | break; |
cbe2c9d3 | 1739 | case OP_MM: |
fb32b1ed | 1740 | write_mmx_reg(ctxt, &op->mm_val, op->addr.mm); |
cbe2c9d3 | 1741 | break; |
dde7e6d1 AK |
1742 | case OP_NONE: |
1743 | /* no writeback */ | |
414e6277 | 1744 | break; |
dde7e6d1 | 1745 | default: |
414e6277 | 1746 | break; |
6aa8b732 | 1747 | } |
dde7e6d1 AK |
1748 | return X86EMUL_CONTINUE; |
1749 | } | |
6aa8b732 | 1750 | |
51ddff50 | 1751 | static int push(struct x86_emulate_ctxt *ctxt, void *data, int bytes) |
dde7e6d1 | 1752 | { |
4179bb02 | 1753 | struct segmented_address addr; |
0dc8d10f | 1754 | |
5ad105e5 | 1755 | rsp_increment(ctxt, -bytes); |
dd856efa | 1756 | addr.ea = reg_read(ctxt, VCPU_REGS_RSP) & stack_mask(ctxt); |
4179bb02 TY |
1757 | addr.seg = VCPU_SREG_SS; |
1758 | ||
51ddff50 AK |
1759 | return segmented_write(ctxt, addr, data, bytes); |
1760 | } | |
1761 | ||
1762 | static int em_push(struct x86_emulate_ctxt *ctxt) | |
1763 | { | |
4179bb02 | 1764 | /* Disable writeback. */ |
9dac77fa | 1765 | ctxt->dst.type = OP_NONE; |
51ddff50 | 1766 | return push(ctxt, &ctxt->src.val, ctxt->op_bytes); |
dde7e6d1 | 1767 | } |
69f55cb1 | 1768 | |
dde7e6d1 | 1769 | static int emulate_pop(struct x86_emulate_ctxt *ctxt, |
dde7e6d1 AK |
1770 | void *dest, int len) |
1771 | { | |
dde7e6d1 | 1772 | int rc; |
90de84f5 | 1773 | struct segmented_address addr; |
8b4caf66 | 1774 | |
dd856efa | 1775 | addr.ea = reg_read(ctxt, VCPU_REGS_RSP) & stack_mask(ctxt); |
90de84f5 | 1776 | addr.seg = VCPU_SREG_SS; |
3ca3ac4d | 1777 | rc = segmented_read(ctxt, addr, dest, len); |
dde7e6d1 AK |
1778 | if (rc != X86EMUL_CONTINUE) |
1779 | return rc; | |
1780 | ||
5ad105e5 | 1781 | rsp_increment(ctxt, len); |
dde7e6d1 | 1782 | return rc; |
8b4caf66 LV |
1783 | } |
1784 | ||
c54fe504 TY |
1785 | static int em_pop(struct x86_emulate_ctxt *ctxt) |
1786 | { | |
9dac77fa | 1787 | return emulate_pop(ctxt, &ctxt->dst.val, ctxt->op_bytes); |
c54fe504 TY |
1788 | } |
1789 | ||
dde7e6d1 | 1790 | static int emulate_popf(struct x86_emulate_ctxt *ctxt, |
7b105ca2 | 1791 | void *dest, int len) |
9de41573 GN |
1792 | { |
1793 | int rc; | |
dde7e6d1 AK |
1794 | unsigned long val, change_mask; |
1795 | int iopl = (ctxt->eflags & X86_EFLAGS_IOPL) >> IOPL_SHIFT; | |
7b105ca2 | 1796 | int cpl = ctxt->ops->cpl(ctxt); |
9de41573 | 1797 | |
3b9be3bf | 1798 | rc = emulate_pop(ctxt, &val, len); |
dde7e6d1 AK |
1799 | if (rc != X86EMUL_CONTINUE) |
1800 | return rc; | |
9de41573 | 1801 | |
dde7e6d1 | 1802 | change_mask = EFLG_CF | EFLG_PF | EFLG_AF | EFLG_ZF | EFLG_SF | EFLG_OF |
163b135e | 1803 | | EFLG_TF | EFLG_DF | EFLG_NT | EFLG_AC | EFLG_ID; |
9de41573 | 1804 | |
dde7e6d1 AK |
1805 | switch(ctxt->mode) { |
1806 | case X86EMUL_MODE_PROT64: | |
1807 | case X86EMUL_MODE_PROT32: | |
1808 | case X86EMUL_MODE_PROT16: | |
1809 | if (cpl == 0) | |
1810 | change_mask |= EFLG_IOPL; | |
1811 | if (cpl <= iopl) | |
1812 | change_mask |= EFLG_IF; | |
1813 | break; | |
1814 | case X86EMUL_MODE_VM86: | |
35d3d4a1 AK |
1815 | if (iopl < 3) |
1816 | return emulate_gp(ctxt, 0); | |
dde7e6d1 AK |
1817 | change_mask |= EFLG_IF; |
1818 | break; | |
1819 | default: /* real mode */ | |
1820 | change_mask |= (EFLG_IOPL | EFLG_IF); | |
1821 | break; | |
9de41573 | 1822 | } |
dde7e6d1 AK |
1823 | |
1824 | *(unsigned long *)dest = | |
1825 | (ctxt->eflags & ~change_mask) | (val & change_mask); | |
1826 | ||
1827 | return rc; | |
9de41573 GN |
1828 | } |
1829 | ||
62aaa2f0 TY |
1830 | static int em_popf(struct x86_emulate_ctxt *ctxt) |
1831 | { | |
9dac77fa AK |
1832 | ctxt->dst.type = OP_REG; |
1833 | ctxt->dst.addr.reg = &ctxt->eflags; | |
1834 | ctxt->dst.bytes = ctxt->op_bytes; | |
1835 | return emulate_popf(ctxt, &ctxt->dst.val, ctxt->op_bytes); | |
62aaa2f0 TY |
1836 | } |
1837 | ||
612e89f0 AK |
1838 | static int em_enter(struct x86_emulate_ctxt *ctxt) |
1839 | { | |
1840 | int rc; | |
1841 | unsigned frame_size = ctxt->src.val; | |
1842 | unsigned nesting_level = ctxt->src2.val & 31; | |
dd856efa | 1843 | ulong rbp; |
612e89f0 AK |
1844 | |
1845 | if (nesting_level) | |
1846 | return X86EMUL_UNHANDLEABLE; | |
1847 | ||
dd856efa AK |
1848 | rbp = reg_read(ctxt, VCPU_REGS_RBP); |
1849 | rc = push(ctxt, &rbp, stack_size(ctxt)); | |
612e89f0 AK |
1850 | if (rc != X86EMUL_CONTINUE) |
1851 | return rc; | |
dd856efa | 1852 | assign_masked(reg_rmw(ctxt, VCPU_REGS_RBP), reg_read(ctxt, VCPU_REGS_RSP), |
612e89f0 | 1853 | stack_mask(ctxt)); |
dd856efa AK |
1854 | assign_masked(reg_rmw(ctxt, VCPU_REGS_RSP), |
1855 | reg_read(ctxt, VCPU_REGS_RSP) - frame_size, | |
612e89f0 AK |
1856 | stack_mask(ctxt)); |
1857 | return X86EMUL_CONTINUE; | |
1858 | } | |
1859 | ||
f47cfa31 AK |
1860 | static int em_leave(struct x86_emulate_ctxt *ctxt) |
1861 | { | |
dd856efa | 1862 | assign_masked(reg_rmw(ctxt, VCPU_REGS_RSP), reg_read(ctxt, VCPU_REGS_RBP), |
f47cfa31 | 1863 | stack_mask(ctxt)); |
dd856efa | 1864 | return emulate_pop(ctxt, reg_rmw(ctxt, VCPU_REGS_RBP), ctxt->op_bytes); |
f47cfa31 AK |
1865 | } |
1866 | ||
1cd196ea | 1867 | static int em_push_sreg(struct x86_emulate_ctxt *ctxt) |
7b262e90 | 1868 | { |
1cd196ea AK |
1869 | int seg = ctxt->src2.val; |
1870 | ||
9dac77fa | 1871 | ctxt->src.val = get_segment_selector(ctxt, seg); |
0fcc207c NA |
1872 | if (ctxt->op_bytes == 4) { |
1873 | rsp_increment(ctxt, -2); | |
1874 | ctxt->op_bytes = 2; | |
1875 | } | |
7b262e90 | 1876 | |
4487b3b4 | 1877 | return em_push(ctxt); |
7b262e90 GN |
1878 | } |
1879 | ||
1cd196ea | 1880 | static int em_pop_sreg(struct x86_emulate_ctxt *ctxt) |
38ba30ba | 1881 | { |
1cd196ea | 1882 | int seg = ctxt->src2.val; |
dde7e6d1 AK |
1883 | unsigned long selector; |
1884 | int rc; | |
38ba30ba | 1885 | |
3313bc4e | 1886 | rc = emulate_pop(ctxt, &selector, 2); |
dde7e6d1 AK |
1887 | if (rc != X86EMUL_CONTINUE) |
1888 | return rc; | |
1889 | ||
a5457e7b PB |
1890 | if (ctxt->modrm_reg == VCPU_SREG_SS) |
1891 | ctxt->interruptibility = KVM_X86_SHADOW_INT_MOV_SS; | |
3313bc4e NA |
1892 | if (ctxt->op_bytes > 2) |
1893 | rsp_increment(ctxt, ctxt->op_bytes - 2); | |
a5457e7b | 1894 | |
7b105ca2 | 1895 | rc = load_segment_descriptor(ctxt, (u16)selector, seg); |
dde7e6d1 | 1896 | return rc; |
38ba30ba GN |
1897 | } |
1898 | ||
b96a7fad | 1899 | static int em_pusha(struct x86_emulate_ctxt *ctxt) |
38ba30ba | 1900 | { |
dd856efa | 1901 | unsigned long old_esp = reg_read(ctxt, VCPU_REGS_RSP); |
dde7e6d1 AK |
1902 | int rc = X86EMUL_CONTINUE; |
1903 | int reg = VCPU_REGS_RAX; | |
38ba30ba | 1904 | |
dde7e6d1 AK |
1905 | while (reg <= VCPU_REGS_RDI) { |
1906 | (reg == VCPU_REGS_RSP) ? | |
dd856efa | 1907 | (ctxt->src.val = old_esp) : (ctxt->src.val = reg_read(ctxt, reg)); |
38ba30ba | 1908 | |
4487b3b4 | 1909 | rc = em_push(ctxt); |
dde7e6d1 AK |
1910 | if (rc != X86EMUL_CONTINUE) |
1911 | return rc; | |
38ba30ba | 1912 | |
dde7e6d1 | 1913 | ++reg; |
38ba30ba | 1914 | } |
38ba30ba | 1915 | |
dde7e6d1 | 1916 | return rc; |
38ba30ba GN |
1917 | } |
1918 | ||
62aaa2f0 TY |
1919 | static int em_pushf(struct x86_emulate_ctxt *ctxt) |
1920 | { | |
bc397a6c | 1921 | ctxt->src.val = (unsigned long)ctxt->eflags & ~EFLG_VM; |
62aaa2f0 TY |
1922 | return em_push(ctxt); |
1923 | } | |
1924 | ||
b96a7fad | 1925 | static int em_popa(struct x86_emulate_ctxt *ctxt) |
38ba30ba | 1926 | { |
dde7e6d1 AK |
1927 | int rc = X86EMUL_CONTINUE; |
1928 | int reg = VCPU_REGS_RDI; | |
38ba30ba | 1929 | |
dde7e6d1 AK |
1930 | while (reg >= VCPU_REGS_RAX) { |
1931 | if (reg == VCPU_REGS_RSP) { | |
5ad105e5 | 1932 | rsp_increment(ctxt, ctxt->op_bytes); |
dde7e6d1 AK |
1933 | --reg; |
1934 | } | |
38ba30ba | 1935 | |
dd856efa | 1936 | rc = emulate_pop(ctxt, reg_rmw(ctxt, reg), ctxt->op_bytes); |
dde7e6d1 AK |
1937 | if (rc != X86EMUL_CONTINUE) |
1938 | break; | |
1939 | --reg; | |
38ba30ba | 1940 | } |
dde7e6d1 | 1941 | return rc; |
38ba30ba GN |
1942 | } |
1943 | ||
dd856efa | 1944 | static int __emulate_int_real(struct x86_emulate_ctxt *ctxt, int irq) |
6e154e56 | 1945 | { |
0225fb50 | 1946 | const struct x86_emulate_ops *ops = ctxt->ops; |
5c56e1cf | 1947 | int rc; |
6e154e56 MG |
1948 | struct desc_ptr dt; |
1949 | gva_t cs_addr; | |
1950 | gva_t eip_addr; | |
1951 | u16 cs, eip; | |
6e154e56 MG |
1952 | |
1953 | /* TODO: Add limit checks */ | |
9dac77fa | 1954 | ctxt->src.val = ctxt->eflags; |
4487b3b4 | 1955 | rc = em_push(ctxt); |
5c56e1cf AK |
1956 | if (rc != X86EMUL_CONTINUE) |
1957 | return rc; | |
6e154e56 MG |
1958 | |
1959 | ctxt->eflags &= ~(EFLG_IF | EFLG_TF | EFLG_AC); | |
1960 | ||
9dac77fa | 1961 | ctxt->src.val = get_segment_selector(ctxt, VCPU_SREG_CS); |
4487b3b4 | 1962 | rc = em_push(ctxt); |
5c56e1cf AK |
1963 | if (rc != X86EMUL_CONTINUE) |
1964 | return rc; | |
6e154e56 | 1965 | |
9dac77fa | 1966 | ctxt->src.val = ctxt->_eip; |
4487b3b4 | 1967 | rc = em_push(ctxt); |
5c56e1cf AK |
1968 | if (rc != X86EMUL_CONTINUE) |
1969 | return rc; | |
1970 | ||
4bff1e86 | 1971 | ops->get_idt(ctxt, &dt); |
6e154e56 MG |
1972 | |
1973 | eip_addr = dt.address + (irq << 2); | |
1974 | cs_addr = dt.address + (irq << 2) + 2; | |
1975 | ||
0f65dd70 | 1976 | rc = ops->read_std(ctxt, cs_addr, &cs, 2, &ctxt->exception); |
6e154e56 MG |
1977 | if (rc != X86EMUL_CONTINUE) |
1978 | return rc; | |
1979 | ||
0f65dd70 | 1980 | rc = ops->read_std(ctxt, eip_addr, &eip, 2, &ctxt->exception); |
6e154e56 MG |
1981 | if (rc != X86EMUL_CONTINUE) |
1982 | return rc; | |
1983 | ||
7b105ca2 | 1984 | rc = load_segment_descriptor(ctxt, cs, VCPU_SREG_CS); |
6e154e56 MG |
1985 | if (rc != X86EMUL_CONTINUE) |
1986 | return rc; | |
1987 | ||
9dac77fa | 1988 | ctxt->_eip = eip; |
6e154e56 MG |
1989 | |
1990 | return rc; | |
1991 | } | |
1992 | ||
dd856efa AK |
1993 | int emulate_int_real(struct x86_emulate_ctxt *ctxt, int irq) |
1994 | { | |
1995 | int rc; | |
1996 | ||
1997 | invalidate_registers(ctxt); | |
1998 | rc = __emulate_int_real(ctxt, irq); | |
1999 | if (rc == X86EMUL_CONTINUE) | |
2000 | writeback_registers(ctxt); | |
2001 | return rc; | |
2002 | } | |
2003 | ||
7b105ca2 | 2004 | static int emulate_int(struct x86_emulate_ctxt *ctxt, int irq) |
6e154e56 MG |
2005 | { |
2006 | switch(ctxt->mode) { | |
2007 | case X86EMUL_MODE_REAL: | |
dd856efa | 2008 | return __emulate_int_real(ctxt, irq); |
6e154e56 MG |
2009 | case X86EMUL_MODE_VM86: |
2010 | case X86EMUL_MODE_PROT16: | |
2011 | case X86EMUL_MODE_PROT32: | |
2012 | case X86EMUL_MODE_PROT64: | |
2013 | default: | |
2014 | /* Protected mode interrupts unimplemented yet */ | |
2015 | return X86EMUL_UNHANDLEABLE; | |
2016 | } | |
2017 | } | |
2018 | ||
7b105ca2 | 2019 | static int emulate_iret_real(struct x86_emulate_ctxt *ctxt) |
38ba30ba | 2020 | { |
dde7e6d1 AK |
2021 | int rc = X86EMUL_CONTINUE; |
2022 | unsigned long temp_eip = 0; | |
2023 | unsigned long temp_eflags = 0; | |
2024 | unsigned long cs = 0; | |
2025 | unsigned long mask = EFLG_CF | EFLG_PF | EFLG_AF | EFLG_ZF | EFLG_SF | EFLG_TF | | |
2026 | EFLG_IF | EFLG_DF | EFLG_OF | EFLG_IOPL | EFLG_NT | EFLG_RF | | |
2027 | EFLG_AC | EFLG_ID | (1 << 1); /* Last one is the reserved bit */ | |
2028 | unsigned long vm86_mask = EFLG_VM | EFLG_VIF | EFLG_VIP; | |
38ba30ba | 2029 | |
dde7e6d1 | 2030 | /* TODO: Add stack limit check */ |
38ba30ba | 2031 | |
9dac77fa | 2032 | rc = emulate_pop(ctxt, &temp_eip, ctxt->op_bytes); |
38ba30ba | 2033 | |
dde7e6d1 AK |
2034 | if (rc != X86EMUL_CONTINUE) |
2035 | return rc; | |
38ba30ba | 2036 | |
35d3d4a1 AK |
2037 | if (temp_eip & ~0xffff) |
2038 | return emulate_gp(ctxt, 0); | |
38ba30ba | 2039 | |
9dac77fa | 2040 | rc = emulate_pop(ctxt, &cs, ctxt->op_bytes); |
38ba30ba | 2041 | |
dde7e6d1 AK |
2042 | if (rc != X86EMUL_CONTINUE) |
2043 | return rc; | |
38ba30ba | 2044 | |
9dac77fa | 2045 | rc = emulate_pop(ctxt, &temp_eflags, ctxt->op_bytes); |
38ba30ba | 2046 | |
dde7e6d1 AK |
2047 | if (rc != X86EMUL_CONTINUE) |
2048 | return rc; | |
38ba30ba | 2049 | |
7b105ca2 | 2050 | rc = load_segment_descriptor(ctxt, (u16)cs, VCPU_SREG_CS); |
38ba30ba | 2051 | |
dde7e6d1 AK |
2052 | if (rc != X86EMUL_CONTINUE) |
2053 | return rc; | |
38ba30ba | 2054 | |
9dac77fa | 2055 | ctxt->_eip = temp_eip; |
38ba30ba | 2056 | |
38ba30ba | 2057 | |
9dac77fa | 2058 | if (ctxt->op_bytes == 4) |
dde7e6d1 | 2059 | ctxt->eflags = ((temp_eflags & mask) | (ctxt->eflags & vm86_mask)); |
9dac77fa | 2060 | else if (ctxt->op_bytes == 2) { |
dde7e6d1 AK |
2061 | ctxt->eflags &= ~0xffff; |
2062 | ctxt->eflags |= temp_eflags; | |
38ba30ba | 2063 | } |
dde7e6d1 AK |
2064 | |
2065 | ctxt->eflags &= ~EFLG_RESERVED_ZEROS_MASK; /* Clear reserved zeros */ | |
2066 | ctxt->eflags |= EFLG_RESERVED_ONE_MASK; | |
801806d9 | 2067 | ctxt->ops->set_nmi_mask(ctxt, false); |
dde7e6d1 AK |
2068 | |
2069 | return rc; | |
38ba30ba GN |
2070 | } |
2071 | ||
e01991e7 | 2072 | static int em_iret(struct x86_emulate_ctxt *ctxt) |
c37eda13 | 2073 | { |
dde7e6d1 AK |
2074 | switch(ctxt->mode) { |
2075 | case X86EMUL_MODE_REAL: | |
7b105ca2 | 2076 | return emulate_iret_real(ctxt); |
dde7e6d1 AK |
2077 | case X86EMUL_MODE_VM86: |
2078 | case X86EMUL_MODE_PROT16: | |
2079 | case X86EMUL_MODE_PROT32: | |
2080 | case X86EMUL_MODE_PROT64: | |
c37eda13 | 2081 | default: |
dde7e6d1 AK |
2082 | /* iret from protected mode unimplemented yet */ |
2083 | return X86EMUL_UNHANDLEABLE; | |
c37eda13 | 2084 | } |
c37eda13 WY |
2085 | } |
2086 | ||
d2f62766 TY |
2087 | static int em_jmp_far(struct x86_emulate_ctxt *ctxt) |
2088 | { | |
d2f62766 | 2089 | int rc; |
d1442d85 NA |
2090 | unsigned short sel, old_sel; |
2091 | struct desc_struct old_desc, new_desc; | |
2092 | const struct x86_emulate_ops *ops = ctxt->ops; | |
2093 | u8 cpl = ctxt->ops->cpl(ctxt); | |
2094 | ||
2095 | /* Assignment of RIP may only fail in 64-bit mode */ | |
2096 | if (ctxt->mode == X86EMUL_MODE_PROT64) | |
2097 | ops->get_segment(ctxt, &old_sel, &old_desc, NULL, | |
2098 | VCPU_SREG_CS); | |
d2f62766 | 2099 | |
9dac77fa | 2100 | memcpy(&sel, ctxt->src.valptr + ctxt->op_bytes, 2); |
d2f62766 | 2101 | |
3dc4bc4f NA |
2102 | rc = __load_segment_descriptor(ctxt, sel, VCPU_SREG_CS, cpl, |
2103 | X86_TRANSFER_CALL_JMP, | |
d1442d85 | 2104 | &new_desc); |
d2f62766 TY |
2105 | if (rc != X86EMUL_CONTINUE) |
2106 | return rc; | |
2107 | ||
d50eaa18 | 2108 | rc = assign_eip_far(ctxt, ctxt->src.val, &new_desc); |
d1442d85 | 2109 | if (rc != X86EMUL_CONTINUE) { |
7e46dddd | 2110 | WARN_ON(ctxt->mode != X86EMUL_MODE_PROT64); |
d1442d85 NA |
2111 | /* assigning eip failed; restore the old cs */ |
2112 | ops->set_segment(ctxt, old_sel, &old_desc, 0, VCPU_SREG_CS); | |
2113 | return rc; | |
2114 | } | |
2115 | return rc; | |
d2f62766 TY |
2116 | } |
2117 | ||
f7784046 | 2118 | static int em_jmp_abs(struct x86_emulate_ctxt *ctxt) |
8cdbd2c9 | 2119 | { |
f7784046 NA |
2120 | return assign_eip_near(ctxt, ctxt->src.val); |
2121 | } | |
8cdbd2c9 | 2122 | |
f7784046 NA |
2123 | static int em_call_near_abs(struct x86_emulate_ctxt *ctxt) |
2124 | { | |
2125 | int rc; | |
2126 | long int old_eip; | |
2127 | ||
2128 | old_eip = ctxt->_eip; | |
2129 | rc = assign_eip_near(ctxt, ctxt->src.val); | |
2130 | if (rc != X86EMUL_CONTINUE) | |
2131 | return rc; | |
2132 | ctxt->src.val = old_eip; | |
2133 | rc = em_push(ctxt); | |
4179bb02 | 2134 | return rc; |
8cdbd2c9 LV |
2135 | } |
2136 | ||
e0dac408 | 2137 | static int em_cmpxchg8b(struct x86_emulate_ctxt *ctxt) |
8cdbd2c9 | 2138 | { |
9dac77fa | 2139 | u64 old = ctxt->dst.orig_val64; |
8cdbd2c9 | 2140 | |
aaa05f24 NA |
2141 | if (ctxt->dst.bytes == 16) |
2142 | return X86EMUL_UNHANDLEABLE; | |
2143 | ||
dd856efa AK |
2144 | if (((u32) (old >> 0) != (u32) reg_read(ctxt, VCPU_REGS_RAX)) || |
2145 | ((u32) (old >> 32) != (u32) reg_read(ctxt, VCPU_REGS_RDX))) { | |
2146 | *reg_write(ctxt, VCPU_REGS_RAX) = (u32) (old >> 0); | |
2147 | *reg_write(ctxt, VCPU_REGS_RDX) = (u32) (old >> 32); | |
05f086f8 | 2148 | ctxt->eflags &= ~EFLG_ZF; |
8cdbd2c9 | 2149 | } else { |
dd856efa AK |
2150 | ctxt->dst.val64 = ((u64)reg_read(ctxt, VCPU_REGS_RCX) << 32) | |
2151 | (u32) reg_read(ctxt, VCPU_REGS_RBX); | |
8cdbd2c9 | 2152 | |
05f086f8 | 2153 | ctxt->eflags |= EFLG_ZF; |
8cdbd2c9 | 2154 | } |
1b30eaa8 | 2155 | return X86EMUL_CONTINUE; |
8cdbd2c9 LV |
2156 | } |
2157 | ||
ebda02c2 TY |
2158 | static int em_ret(struct x86_emulate_ctxt *ctxt) |
2159 | { | |
234f3ce4 NA |
2160 | int rc; |
2161 | unsigned long eip; | |
2162 | ||
2163 | rc = emulate_pop(ctxt, &eip, ctxt->op_bytes); | |
2164 | if (rc != X86EMUL_CONTINUE) | |
2165 | return rc; | |
2166 | ||
2167 | return assign_eip_near(ctxt, eip); | |
ebda02c2 TY |
2168 | } |
2169 | ||
e01991e7 | 2170 | static int em_ret_far(struct x86_emulate_ctxt *ctxt) |
a77ab5ea | 2171 | { |
a77ab5ea | 2172 | int rc; |
d1442d85 NA |
2173 | unsigned long eip, cs; |
2174 | u16 old_cs; | |
9e8919ae | 2175 | int cpl = ctxt->ops->cpl(ctxt); |
d1442d85 NA |
2176 | struct desc_struct old_desc, new_desc; |
2177 | const struct x86_emulate_ops *ops = ctxt->ops; | |
2178 | ||
2179 | if (ctxt->mode == X86EMUL_MODE_PROT64) | |
2180 | ops->get_segment(ctxt, &old_cs, &old_desc, NULL, | |
2181 | VCPU_SREG_CS); | |
a77ab5ea | 2182 | |
d1442d85 | 2183 | rc = emulate_pop(ctxt, &eip, ctxt->op_bytes); |
1b30eaa8 | 2184 | if (rc != X86EMUL_CONTINUE) |
a77ab5ea | 2185 | return rc; |
9dac77fa | 2186 | rc = emulate_pop(ctxt, &cs, ctxt->op_bytes); |
1b30eaa8 | 2187 | if (rc != X86EMUL_CONTINUE) |
a77ab5ea | 2188 | return rc; |
9e8919ae NA |
2189 | /* Outer-privilege level return is not implemented */ |
2190 | if (ctxt->mode >= X86EMUL_MODE_PROT16 && (cs & 3) > cpl) | |
2191 | return X86EMUL_UNHANDLEABLE; | |
3dc4bc4f NA |
2192 | rc = __load_segment_descriptor(ctxt, (u16)cs, VCPU_SREG_CS, cpl, |
2193 | X86_TRANSFER_RET, | |
d1442d85 NA |
2194 | &new_desc); |
2195 | if (rc != X86EMUL_CONTINUE) | |
2196 | return rc; | |
d50eaa18 | 2197 | rc = assign_eip_far(ctxt, eip, &new_desc); |
d1442d85 | 2198 | if (rc != X86EMUL_CONTINUE) { |
7e46dddd | 2199 | WARN_ON(ctxt->mode != X86EMUL_MODE_PROT64); |
d1442d85 NA |
2200 | ops->set_segment(ctxt, old_cs, &old_desc, 0, VCPU_SREG_CS); |
2201 | } | |
a77ab5ea AK |
2202 | return rc; |
2203 | } | |
2204 | ||
3261107e BR |
2205 | static int em_ret_far_imm(struct x86_emulate_ctxt *ctxt) |
2206 | { | |
2207 | int rc; | |
2208 | ||
2209 | rc = em_ret_far(ctxt); | |
2210 | if (rc != X86EMUL_CONTINUE) | |
2211 | return rc; | |
2212 | rsp_increment(ctxt, ctxt->src.val); | |
2213 | return X86EMUL_CONTINUE; | |
2214 | } | |
2215 | ||
e940b5c2 TY |
2216 | static int em_cmpxchg(struct x86_emulate_ctxt *ctxt) |
2217 | { | |
2218 | /* Save real source value, then compare EAX against destination. */ | |
37c564f2 NA |
2219 | ctxt->dst.orig_val = ctxt->dst.val; |
2220 | ctxt->dst.val = reg_read(ctxt, VCPU_REGS_RAX); | |
e940b5c2 | 2221 | ctxt->src.orig_val = ctxt->src.val; |
37c564f2 | 2222 | ctxt->src.val = ctxt->dst.orig_val; |
158de57f | 2223 | fastop(ctxt, em_cmp); |
e940b5c2 TY |
2224 | |
2225 | if (ctxt->eflags & EFLG_ZF) { | |
2fcf5c8a NA |
2226 | /* Success: write back to memory; no update of EAX */ |
2227 | ctxt->src.type = OP_NONE; | |
e940b5c2 TY |
2228 | ctxt->dst.val = ctxt->src.orig_val; |
2229 | } else { | |
2230 | /* Failure: write the value we saw to EAX. */ | |
2fcf5c8a NA |
2231 | ctxt->src.type = OP_REG; |
2232 | ctxt->src.addr.reg = reg_rmw(ctxt, VCPU_REGS_RAX); | |
2233 | ctxt->src.val = ctxt->dst.orig_val; | |
2234 | /* Create write-cycle to dest by writing the same value */ | |
37c564f2 | 2235 | ctxt->dst.val = ctxt->dst.orig_val; |
e940b5c2 TY |
2236 | } |
2237 | return X86EMUL_CONTINUE; | |
2238 | } | |
2239 | ||
d4b4325f | 2240 | static int em_lseg(struct x86_emulate_ctxt *ctxt) |
09b5f4d3 | 2241 | { |
d4b4325f | 2242 | int seg = ctxt->src2.val; |
09b5f4d3 WY |
2243 | unsigned short sel; |
2244 | int rc; | |
2245 | ||
9dac77fa | 2246 | memcpy(&sel, ctxt->src.valptr + ctxt->op_bytes, 2); |
09b5f4d3 | 2247 | |
7b105ca2 | 2248 | rc = load_segment_descriptor(ctxt, sel, seg); |
09b5f4d3 WY |
2249 | if (rc != X86EMUL_CONTINUE) |
2250 | return rc; | |
2251 | ||
9dac77fa | 2252 | ctxt->dst.val = ctxt->src.val; |
09b5f4d3 WY |
2253 | return rc; |
2254 | } | |
2255 | ||
7b105ca2 | 2256 | static void |
e66bb2cc | 2257 | setup_syscalls_segments(struct x86_emulate_ctxt *ctxt, |
7b105ca2 | 2258 | struct desc_struct *cs, struct desc_struct *ss) |
e66bb2cc | 2259 | { |
e66bb2cc | 2260 | cs->l = 0; /* will be adjusted later */ |
79168fd1 | 2261 | set_desc_base(cs, 0); /* flat segment */ |
e66bb2cc | 2262 | cs->g = 1; /* 4kb granularity */ |
79168fd1 | 2263 | set_desc_limit(cs, 0xfffff); /* 4GB limit */ |
e66bb2cc AP |
2264 | cs->type = 0x0b; /* Read, Execute, Accessed */ |
2265 | cs->s = 1; | |
2266 | cs->dpl = 0; /* will be adjusted later */ | |
79168fd1 GN |
2267 | cs->p = 1; |
2268 | cs->d = 1; | |
99245b50 | 2269 | cs->avl = 0; |
e66bb2cc | 2270 | |
79168fd1 GN |
2271 | set_desc_base(ss, 0); /* flat segment */ |
2272 | set_desc_limit(ss, 0xfffff); /* 4GB limit */ | |
e66bb2cc AP |
2273 | ss->g = 1; /* 4kb granularity */ |
2274 | ss->s = 1; | |
2275 | ss->type = 0x03; /* Read/Write, Accessed */ | |
79168fd1 | 2276 | ss->d = 1; /* 32bit stack segment */ |
e66bb2cc | 2277 | ss->dpl = 0; |
79168fd1 | 2278 | ss->p = 1; |
99245b50 GN |
2279 | ss->l = 0; |
2280 | ss->avl = 0; | |
e66bb2cc AP |
2281 | } |
2282 | ||
1a18a69b AK |
2283 | static bool vendor_intel(struct x86_emulate_ctxt *ctxt) |
2284 | { | |
2285 | u32 eax, ebx, ecx, edx; | |
2286 | ||
2287 | eax = ecx = 0; | |
0017f93a AK |
2288 | ctxt->ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx); |
2289 | return ebx == X86EMUL_CPUID_VENDOR_GenuineIntel_ebx | |
1a18a69b AK |
2290 | && ecx == X86EMUL_CPUID_VENDOR_GenuineIntel_ecx |
2291 | && edx == X86EMUL_CPUID_VENDOR_GenuineIntel_edx; | |
2292 | } | |
2293 | ||
c2226fc9 SB |
2294 | static bool em_syscall_is_enabled(struct x86_emulate_ctxt *ctxt) |
2295 | { | |
0225fb50 | 2296 | const struct x86_emulate_ops *ops = ctxt->ops; |
c2226fc9 SB |
2297 | u32 eax, ebx, ecx, edx; |
2298 | ||
2299 | /* | |
2300 | * syscall should always be enabled in longmode - so only become | |
2301 | * vendor specific (cpuid) if other modes are active... | |
2302 | */ | |
2303 | if (ctxt->mode == X86EMUL_MODE_PROT64) | |
2304 | return true; | |
2305 | ||
2306 | eax = 0x00000000; | |
2307 | ecx = 0x00000000; | |
0017f93a AK |
2308 | ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx); |
2309 | /* | |
2310 | * Intel ("GenuineIntel") | |
2311 | * remark: Intel CPUs only support "syscall" in 64bit | |
2312 | * longmode. Also an 64bit guest with a | |
2313 | * 32bit compat-app running will #UD !! While this | |
2314 | * behaviour can be fixed (by emulating) into AMD | |
2315 | * response - CPUs of AMD can't behave like Intel. | |
2316 | */ | |
2317 | if (ebx == X86EMUL_CPUID_VENDOR_GenuineIntel_ebx && | |
2318 | ecx == X86EMUL_CPUID_VENDOR_GenuineIntel_ecx && | |
2319 | edx == X86EMUL_CPUID_VENDOR_GenuineIntel_edx) | |
2320 | return false; | |
2321 | ||
2322 | /* AMD ("AuthenticAMD") */ | |
2323 | if (ebx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ebx && | |
2324 | ecx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ecx && | |
2325 | edx == X86EMUL_CPUID_VENDOR_AuthenticAMD_edx) | |
2326 | return true; | |
2327 | ||
2328 | /* AMD ("AMDisbetter!") */ | |
2329 | if (ebx == X86EMUL_CPUID_VENDOR_AMDisbetterI_ebx && | |
2330 | ecx == X86EMUL_CPUID_VENDOR_AMDisbetterI_ecx && | |
2331 | edx == X86EMUL_CPUID_VENDOR_AMDisbetterI_edx) | |
2332 | return true; | |
c2226fc9 SB |
2333 | |
2334 | /* default: (not Intel, not AMD), apply Intel's stricter rules... */ | |
2335 | return false; | |
2336 | } | |
2337 | ||
e01991e7 | 2338 | static int em_syscall(struct x86_emulate_ctxt *ctxt) |
e66bb2cc | 2339 | { |
0225fb50 | 2340 | const struct x86_emulate_ops *ops = ctxt->ops; |
79168fd1 | 2341 | struct desc_struct cs, ss; |
e66bb2cc | 2342 | u64 msr_data; |
79168fd1 | 2343 | u16 cs_sel, ss_sel; |
c2ad2bb3 | 2344 | u64 efer = 0; |
e66bb2cc AP |
2345 | |
2346 | /* syscall is not available in real mode */ | |
2e901c4c | 2347 | if (ctxt->mode == X86EMUL_MODE_REAL || |
35d3d4a1 AK |
2348 | ctxt->mode == X86EMUL_MODE_VM86) |
2349 | return emulate_ud(ctxt); | |
e66bb2cc | 2350 | |
c2226fc9 SB |
2351 | if (!(em_syscall_is_enabled(ctxt))) |
2352 | return emulate_ud(ctxt); | |
2353 | ||
c2ad2bb3 | 2354 | ops->get_msr(ctxt, MSR_EFER, &efer); |
7b105ca2 | 2355 | setup_syscalls_segments(ctxt, &cs, &ss); |
e66bb2cc | 2356 | |
c2226fc9 SB |
2357 | if (!(efer & EFER_SCE)) |
2358 | return emulate_ud(ctxt); | |
2359 | ||
717746e3 | 2360 | ops->get_msr(ctxt, MSR_STAR, &msr_data); |
e66bb2cc | 2361 | msr_data >>= 32; |
79168fd1 GN |
2362 | cs_sel = (u16)(msr_data & 0xfffc); |
2363 | ss_sel = (u16)(msr_data + 8); | |
e66bb2cc | 2364 | |
c2ad2bb3 | 2365 | if (efer & EFER_LMA) { |
79168fd1 | 2366 | cs.d = 0; |
e66bb2cc AP |
2367 | cs.l = 1; |
2368 | } | |
1aa36616 AK |
2369 | ops->set_segment(ctxt, cs_sel, &cs, 0, VCPU_SREG_CS); |
2370 | ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS); | |
e66bb2cc | 2371 | |
dd856efa | 2372 | *reg_write(ctxt, VCPU_REGS_RCX) = ctxt->_eip; |
c2ad2bb3 | 2373 | if (efer & EFER_LMA) { |
e66bb2cc | 2374 | #ifdef CONFIG_X86_64 |
6c6cb69b | 2375 | *reg_write(ctxt, VCPU_REGS_R11) = ctxt->eflags; |
e66bb2cc | 2376 | |
717746e3 | 2377 | ops->get_msr(ctxt, |
3fb1b5db GN |
2378 | ctxt->mode == X86EMUL_MODE_PROT64 ? |
2379 | MSR_LSTAR : MSR_CSTAR, &msr_data); | |
9dac77fa | 2380 | ctxt->_eip = msr_data; |
e66bb2cc | 2381 | |
717746e3 | 2382 | ops->get_msr(ctxt, MSR_SYSCALL_MASK, &msr_data); |
6c6cb69b | 2383 | ctxt->eflags &= ~msr_data; |
807c1425 | 2384 | ctxt->eflags |= EFLG_RESERVED_ONE_MASK; |
e66bb2cc AP |
2385 | #endif |
2386 | } else { | |
2387 | /* legacy mode */ | |
717746e3 | 2388 | ops->get_msr(ctxt, MSR_STAR, &msr_data); |
9dac77fa | 2389 | ctxt->_eip = (u32)msr_data; |
e66bb2cc | 2390 | |
6c6cb69b | 2391 | ctxt->eflags &= ~(EFLG_VM | EFLG_IF); |
e66bb2cc AP |
2392 | } |
2393 | ||
e54cfa97 | 2394 | return X86EMUL_CONTINUE; |
e66bb2cc AP |
2395 | } |
2396 | ||
e01991e7 | 2397 | static int em_sysenter(struct x86_emulate_ctxt *ctxt) |
8c604352 | 2398 | { |
0225fb50 | 2399 | const struct x86_emulate_ops *ops = ctxt->ops; |
79168fd1 | 2400 | struct desc_struct cs, ss; |
8c604352 | 2401 | u64 msr_data; |
79168fd1 | 2402 | u16 cs_sel, ss_sel; |
c2ad2bb3 | 2403 | u64 efer = 0; |
8c604352 | 2404 | |
7b105ca2 | 2405 | ops->get_msr(ctxt, MSR_EFER, &efer); |
a0044755 | 2406 | /* inject #GP if in real mode */ |
35d3d4a1 AK |
2407 | if (ctxt->mode == X86EMUL_MODE_REAL) |
2408 | return emulate_gp(ctxt, 0); | |
8c604352 | 2409 | |
1a18a69b AK |
2410 | /* |
2411 | * Not recognized on AMD in compat mode (but is recognized in legacy | |
2412 | * mode). | |
2413 | */ | |
f3747379 | 2414 | if ((ctxt->mode != X86EMUL_MODE_PROT64) && (efer & EFER_LMA) |
1a18a69b AK |
2415 | && !vendor_intel(ctxt)) |
2416 | return emulate_ud(ctxt); | |
2417 | ||
b2c9d43e | 2418 | /* sysenter/sysexit have not been tested in 64bit mode. */ |
35d3d4a1 | 2419 | if (ctxt->mode == X86EMUL_MODE_PROT64) |
b2c9d43e | 2420 | return X86EMUL_UNHANDLEABLE; |
8c604352 | 2421 | |
7b105ca2 | 2422 | setup_syscalls_segments(ctxt, &cs, &ss); |
8c604352 | 2423 | |
717746e3 | 2424 | ops->get_msr(ctxt, MSR_IA32_SYSENTER_CS, &msr_data); |
f3747379 NA |
2425 | if ((msr_data & 0xfffc) == 0x0) |
2426 | return emulate_gp(ctxt, 0); | |
8c604352 | 2427 | |
6c6cb69b | 2428 | ctxt->eflags &= ~(EFLG_VM | EFLG_IF); |
f3747379 | 2429 | cs_sel = (u16)msr_data & ~SELECTOR_RPL_MASK; |
79168fd1 | 2430 | ss_sel = cs_sel + 8; |
f3747379 | 2431 | if (efer & EFER_LMA) { |
79168fd1 | 2432 | cs.d = 0; |
8c604352 AP |
2433 | cs.l = 1; |
2434 | } | |
2435 | ||
1aa36616 AK |
2436 | ops->set_segment(ctxt, cs_sel, &cs, 0, VCPU_SREG_CS); |
2437 | ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS); | |
8c604352 | 2438 | |
717746e3 | 2439 | ops->get_msr(ctxt, MSR_IA32_SYSENTER_EIP, &msr_data); |
f3747379 | 2440 | ctxt->_eip = (efer & EFER_LMA) ? msr_data : (u32)msr_data; |
8c604352 | 2441 | |
717746e3 | 2442 | ops->get_msr(ctxt, MSR_IA32_SYSENTER_ESP, &msr_data); |
f3747379 NA |
2443 | *reg_write(ctxt, VCPU_REGS_RSP) = (efer & EFER_LMA) ? msr_data : |
2444 | (u32)msr_data; | |
8c604352 | 2445 | |
e54cfa97 | 2446 | return X86EMUL_CONTINUE; |
8c604352 AP |
2447 | } |
2448 | ||
e01991e7 | 2449 | static int em_sysexit(struct x86_emulate_ctxt *ctxt) |
4668f050 | 2450 | { |
0225fb50 | 2451 | const struct x86_emulate_ops *ops = ctxt->ops; |
79168fd1 | 2452 | struct desc_struct cs, ss; |
234f3ce4 | 2453 | u64 msr_data, rcx, rdx; |
4668f050 | 2454 | int usermode; |
1249b96e | 2455 | u16 cs_sel = 0, ss_sel = 0; |
4668f050 | 2456 | |
a0044755 GN |
2457 | /* inject #GP if in real mode or Virtual 8086 mode */ |
2458 | if (ctxt->mode == X86EMUL_MODE_REAL || | |
35d3d4a1 AK |
2459 | ctxt->mode == X86EMUL_MODE_VM86) |
2460 | return emulate_gp(ctxt, 0); | |
4668f050 | 2461 | |
7b105ca2 | 2462 | setup_syscalls_segments(ctxt, &cs, &ss); |
4668f050 | 2463 | |
9dac77fa | 2464 | if ((ctxt->rex_prefix & 0x8) != 0x0) |
4668f050 AP |
2465 | usermode = X86EMUL_MODE_PROT64; |
2466 | else | |
2467 | usermode = X86EMUL_MODE_PROT32; | |
2468 | ||
234f3ce4 NA |
2469 | rcx = reg_read(ctxt, VCPU_REGS_RCX); |
2470 | rdx = reg_read(ctxt, VCPU_REGS_RDX); | |
2471 | ||
4668f050 AP |
2472 | cs.dpl = 3; |
2473 | ss.dpl = 3; | |
717746e3 | 2474 | ops->get_msr(ctxt, MSR_IA32_SYSENTER_CS, &msr_data); |
4668f050 AP |
2475 | switch (usermode) { |
2476 | case X86EMUL_MODE_PROT32: | |
79168fd1 | 2477 | cs_sel = (u16)(msr_data + 16); |
35d3d4a1 AK |
2478 | if ((msr_data & 0xfffc) == 0x0) |
2479 | return emulate_gp(ctxt, 0); | |
79168fd1 | 2480 | ss_sel = (u16)(msr_data + 24); |
bf0b682c NA |
2481 | rcx = (u32)rcx; |
2482 | rdx = (u32)rdx; | |
4668f050 AP |
2483 | break; |
2484 | case X86EMUL_MODE_PROT64: | |
79168fd1 | 2485 | cs_sel = (u16)(msr_data + 32); |
35d3d4a1 AK |
2486 | if (msr_data == 0x0) |
2487 | return emulate_gp(ctxt, 0); | |
79168fd1 GN |
2488 | ss_sel = cs_sel + 8; |
2489 | cs.d = 0; | |
4668f050 | 2490 | cs.l = 1; |
234f3ce4 NA |
2491 | if (is_noncanonical_address(rcx) || |
2492 | is_noncanonical_address(rdx)) | |
2493 | return emulate_gp(ctxt, 0); | |
4668f050 AP |
2494 | break; |
2495 | } | |
79168fd1 GN |
2496 | cs_sel |= SELECTOR_RPL_MASK; |
2497 | ss_sel |= SELECTOR_RPL_MASK; | |
4668f050 | 2498 | |
1aa36616 AK |
2499 | ops->set_segment(ctxt, cs_sel, &cs, 0, VCPU_SREG_CS); |
2500 | ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS); | |
4668f050 | 2501 | |
234f3ce4 NA |
2502 | ctxt->_eip = rdx; |
2503 | *reg_write(ctxt, VCPU_REGS_RSP) = rcx; | |
4668f050 | 2504 | |
e54cfa97 | 2505 | return X86EMUL_CONTINUE; |
4668f050 AP |
2506 | } |
2507 | ||
7b105ca2 | 2508 | static bool emulator_bad_iopl(struct x86_emulate_ctxt *ctxt) |
f850e2e6 GN |
2509 | { |
2510 | int iopl; | |
2511 | if (ctxt->mode == X86EMUL_MODE_REAL) | |
2512 | return false; | |
2513 | if (ctxt->mode == X86EMUL_MODE_VM86) | |
2514 | return true; | |
2515 | iopl = (ctxt->eflags & X86_EFLAGS_IOPL) >> IOPL_SHIFT; | |
7b105ca2 | 2516 | return ctxt->ops->cpl(ctxt) > iopl; |
f850e2e6 GN |
2517 | } |
2518 | ||
2519 | static bool emulator_io_port_access_allowed(struct x86_emulate_ctxt *ctxt, | |
f850e2e6 GN |
2520 | u16 port, u16 len) |
2521 | { | |
0225fb50 | 2522 | const struct x86_emulate_ops *ops = ctxt->ops; |
79168fd1 | 2523 | struct desc_struct tr_seg; |
5601d05b | 2524 | u32 base3; |
f850e2e6 | 2525 | int r; |
1aa36616 | 2526 | u16 tr, io_bitmap_ptr, perm, bit_idx = port & 0x7; |
f850e2e6 | 2527 | unsigned mask = (1 << len) - 1; |
5601d05b | 2528 | unsigned long base; |
f850e2e6 | 2529 | |
1aa36616 | 2530 | ops->get_segment(ctxt, &tr, &tr_seg, &base3, VCPU_SREG_TR); |
79168fd1 | 2531 | if (!tr_seg.p) |
f850e2e6 | 2532 | return false; |
79168fd1 | 2533 | if (desc_limit_scaled(&tr_seg) < 103) |
f850e2e6 | 2534 | return false; |
5601d05b GN |
2535 | base = get_desc_base(&tr_seg); |
2536 | #ifdef CONFIG_X86_64 | |
2537 | base |= ((u64)base3) << 32; | |
2538 | #endif | |
0f65dd70 | 2539 | r = ops->read_std(ctxt, base + 102, &io_bitmap_ptr, 2, NULL); |
f850e2e6 GN |
2540 | if (r != X86EMUL_CONTINUE) |
2541 | return false; | |
79168fd1 | 2542 | if (io_bitmap_ptr + port/8 > desc_limit_scaled(&tr_seg)) |
f850e2e6 | 2543 | return false; |
0f65dd70 | 2544 | r = ops->read_std(ctxt, base + io_bitmap_ptr + port/8, &perm, 2, NULL); |
f850e2e6 GN |
2545 | if (r != X86EMUL_CONTINUE) |
2546 | return false; | |
2547 | if ((perm >> bit_idx) & mask) | |
2548 | return false; | |
2549 | return true; | |
2550 | } | |
2551 | ||
2552 | static bool emulator_io_permited(struct x86_emulate_ctxt *ctxt, | |
f850e2e6 GN |
2553 | u16 port, u16 len) |
2554 | { | |
4fc40f07 GN |
2555 | if (ctxt->perm_ok) |
2556 | return true; | |
2557 | ||
7b105ca2 TY |
2558 | if (emulator_bad_iopl(ctxt)) |
2559 | if (!emulator_io_port_access_allowed(ctxt, port, len)) | |
f850e2e6 | 2560 | return false; |
4fc40f07 GN |
2561 | |
2562 | ctxt->perm_ok = true; | |
2563 | ||
f850e2e6 GN |
2564 | return true; |
2565 | } | |
2566 | ||
38ba30ba | 2567 | static void save_state_to_tss16(struct x86_emulate_ctxt *ctxt, |
38ba30ba GN |
2568 | struct tss_segment_16 *tss) |
2569 | { | |
9dac77fa | 2570 | tss->ip = ctxt->_eip; |
38ba30ba | 2571 | tss->flag = ctxt->eflags; |
dd856efa AK |
2572 | tss->ax = reg_read(ctxt, VCPU_REGS_RAX); |
2573 | tss->cx = reg_read(ctxt, VCPU_REGS_RCX); | |
2574 | tss->dx = reg_read(ctxt, VCPU_REGS_RDX); | |
2575 | tss->bx = reg_read(ctxt, VCPU_REGS_RBX); | |
2576 | tss->sp = reg_read(ctxt, VCPU_REGS_RSP); | |
2577 | tss->bp = reg_read(ctxt, VCPU_REGS_RBP); | |
2578 | tss->si = reg_read(ctxt, VCPU_REGS_RSI); | |
2579 | tss->di = reg_read(ctxt, VCPU_REGS_RDI); | |
38ba30ba | 2580 | |
1aa36616 AK |
2581 | tss->es = get_segment_selector(ctxt, VCPU_SREG_ES); |
2582 | tss->cs = get_segment_selector(ctxt, VCPU_SREG_CS); | |
2583 | tss->ss = get_segment_selector(ctxt, VCPU_SREG_SS); | |
2584 | tss->ds = get_segment_selector(ctxt, VCPU_SREG_DS); | |
2585 | tss->ldt = get_segment_selector(ctxt, VCPU_SREG_LDTR); | |
38ba30ba GN |
2586 | } |
2587 | ||
2588 | static int load_state_from_tss16(struct x86_emulate_ctxt *ctxt, | |
38ba30ba GN |
2589 | struct tss_segment_16 *tss) |
2590 | { | |
38ba30ba | 2591 | int ret; |
2356aaeb | 2592 | u8 cpl; |
38ba30ba | 2593 | |
9dac77fa | 2594 | ctxt->_eip = tss->ip; |
38ba30ba | 2595 | ctxt->eflags = tss->flag | 2; |
dd856efa AK |
2596 | *reg_write(ctxt, VCPU_REGS_RAX) = tss->ax; |
2597 | *reg_write(ctxt, VCPU_REGS_RCX) = tss->cx; | |
2598 | *reg_write(ctxt, VCPU_REGS_RDX) = tss->dx; | |
2599 | *reg_write(ctxt, VCPU_REGS_RBX) = tss->bx; | |
2600 | *reg_write(ctxt, VCPU_REGS_RSP) = tss->sp; | |
2601 | *reg_write(ctxt, VCPU_REGS_RBP) = tss->bp; | |
2602 | *reg_write(ctxt, VCPU_REGS_RSI) = tss->si; | |
2603 | *reg_write(ctxt, VCPU_REGS_RDI) = tss->di; | |
38ba30ba GN |
2604 | |
2605 | /* | |
2606 | * SDM says that segment selectors are loaded before segment | |
2607 | * descriptors | |
2608 | */ | |
1aa36616 AK |
2609 | set_segment_selector(ctxt, tss->ldt, VCPU_SREG_LDTR); |
2610 | set_segment_selector(ctxt, tss->es, VCPU_SREG_ES); | |
2611 | set_segment_selector(ctxt, tss->cs, VCPU_SREG_CS); | |
2612 | set_segment_selector(ctxt, tss->ss, VCPU_SREG_SS); | |
2613 | set_segment_selector(ctxt, tss->ds, VCPU_SREG_DS); | |
38ba30ba | 2614 | |
2356aaeb PB |
2615 | cpl = tss->cs & 3; |
2616 | ||
38ba30ba | 2617 | /* |
fc058680 | 2618 | * Now load segment descriptors. If fault happens at this stage |
38ba30ba GN |
2619 | * it is handled in a context of new task |
2620 | */ | |
d1442d85 | 2621 | ret = __load_segment_descriptor(ctxt, tss->ldt, VCPU_SREG_LDTR, cpl, |
3dc4bc4f | 2622 | X86_TRANSFER_TASK_SWITCH, NULL); |
38ba30ba GN |
2623 | if (ret != X86EMUL_CONTINUE) |
2624 | return ret; | |
d1442d85 | 2625 | ret = __load_segment_descriptor(ctxt, tss->es, VCPU_SREG_ES, cpl, |
3dc4bc4f | 2626 | X86_TRANSFER_TASK_SWITCH, NULL); |
38ba30ba GN |
2627 | if (ret != X86EMUL_CONTINUE) |
2628 | return ret; | |
d1442d85 | 2629 | ret = __load_segment_descriptor(ctxt, tss->cs, VCPU_SREG_CS, cpl, |
3dc4bc4f | 2630 | X86_TRANSFER_TASK_SWITCH, NULL); |
38ba30ba GN |
2631 | if (ret != X86EMUL_CONTINUE) |
2632 | return ret; | |
d1442d85 | 2633 | ret = __load_segment_descriptor(ctxt, tss->ss, VCPU_SREG_SS, cpl, |
3dc4bc4f | 2634 | X86_TRANSFER_TASK_SWITCH, NULL); |
38ba30ba GN |
2635 | if (ret != X86EMUL_CONTINUE) |
2636 | return ret; | |
d1442d85 | 2637 | ret = __load_segment_descriptor(ctxt, tss->ds, VCPU_SREG_DS, cpl, |
3dc4bc4f | 2638 | X86_TRANSFER_TASK_SWITCH, NULL); |
38ba30ba GN |
2639 | if (ret != X86EMUL_CONTINUE) |
2640 | return ret; | |
2641 | ||
2642 | return X86EMUL_CONTINUE; | |
2643 | } | |
2644 | ||
2645 | static int task_switch_16(struct x86_emulate_ctxt *ctxt, | |
38ba30ba GN |
2646 | u16 tss_selector, u16 old_tss_sel, |
2647 | ulong old_tss_base, struct desc_struct *new_desc) | |
2648 | { | |
0225fb50 | 2649 | const struct x86_emulate_ops *ops = ctxt->ops; |
38ba30ba GN |
2650 | struct tss_segment_16 tss_seg; |
2651 | int ret; | |
bcc55cba | 2652 | u32 new_tss_base = get_desc_base(new_desc); |
38ba30ba | 2653 | |
0f65dd70 | 2654 | ret = ops->read_std(ctxt, old_tss_base, &tss_seg, sizeof tss_seg, |
bcc55cba | 2655 | &ctxt->exception); |
db297e3d | 2656 | if (ret != X86EMUL_CONTINUE) |
38ba30ba | 2657 | return ret; |
38ba30ba | 2658 | |
7b105ca2 | 2659 | save_state_to_tss16(ctxt, &tss_seg); |
38ba30ba | 2660 | |
0f65dd70 | 2661 | ret = ops->write_std(ctxt, old_tss_base, &tss_seg, sizeof tss_seg, |
bcc55cba | 2662 | &ctxt->exception); |
db297e3d | 2663 | if (ret != X86EMUL_CONTINUE) |
38ba30ba | 2664 | return ret; |
38ba30ba | 2665 | |
0f65dd70 | 2666 | ret = ops->read_std(ctxt, new_tss_base, &tss_seg, sizeof tss_seg, |
bcc55cba | 2667 | &ctxt->exception); |
db297e3d | 2668 | if (ret != X86EMUL_CONTINUE) |
38ba30ba | 2669 | return ret; |
38ba30ba GN |
2670 | |
2671 | if (old_tss_sel != 0xffff) { | |
2672 | tss_seg.prev_task_link = old_tss_sel; | |
2673 | ||
0f65dd70 | 2674 | ret = ops->write_std(ctxt, new_tss_base, |
38ba30ba GN |
2675 | &tss_seg.prev_task_link, |
2676 | sizeof tss_seg.prev_task_link, | |
0f65dd70 | 2677 | &ctxt->exception); |
db297e3d | 2678 | if (ret != X86EMUL_CONTINUE) |
38ba30ba | 2679 | return ret; |
38ba30ba GN |
2680 | } |
2681 | ||
7b105ca2 | 2682 | return load_state_from_tss16(ctxt, &tss_seg); |
38ba30ba GN |
2683 | } |
2684 | ||
2685 | static void save_state_to_tss32(struct x86_emulate_ctxt *ctxt, | |
38ba30ba GN |
2686 | struct tss_segment_32 *tss) |
2687 | { | |
5c7411e2 | 2688 | /* CR3 and ldt selector are not saved intentionally */ |
9dac77fa | 2689 | tss->eip = ctxt->_eip; |
38ba30ba | 2690 | tss->eflags = ctxt->eflags; |
dd856efa AK |
2691 | tss->eax = reg_read(ctxt, VCPU_REGS_RAX); |
2692 | tss->ecx = reg_read(ctxt, VCPU_REGS_RCX); | |
2693 | tss->edx = reg_read(ctxt, VCPU_REGS_RDX); | |
2694 | tss->ebx = reg_read(ctxt, VCPU_REGS_RBX); | |
2695 | tss->esp = reg_read(ctxt, VCPU_REGS_RSP); | |
2696 | tss->ebp = reg_read(ctxt, VCPU_REGS_RBP); | |
2697 | tss->esi = reg_read(ctxt, VCPU_REGS_RSI); | |
2698 | tss->edi = reg_read(ctxt, VCPU_REGS_RDI); | |
38ba30ba | 2699 | |
1aa36616 AK |
2700 | tss->es = get_segment_selector(ctxt, VCPU_SREG_ES); |
2701 | tss->cs = get_segment_selector(ctxt, VCPU_SREG_CS); | |
2702 | tss->ss = get_segment_selector(ctxt, VCPU_SREG_SS); | |
2703 | tss->ds = get_segment_selector(ctxt, VCPU_SREG_DS); | |
2704 | tss->fs = get_segment_selector(ctxt, VCPU_SREG_FS); | |
2705 | tss->gs = get_segment_selector(ctxt, VCPU_SREG_GS); | |
38ba30ba GN |
2706 | } |
2707 | ||
2708 | static int load_state_from_tss32(struct x86_emulate_ctxt *ctxt, | |
38ba30ba GN |
2709 | struct tss_segment_32 *tss) |
2710 | { | |
38ba30ba | 2711 | int ret; |
2356aaeb | 2712 | u8 cpl; |
38ba30ba | 2713 | |
7b105ca2 | 2714 | if (ctxt->ops->set_cr(ctxt, 3, tss->cr3)) |
35d3d4a1 | 2715 | return emulate_gp(ctxt, 0); |
9dac77fa | 2716 | ctxt->_eip = tss->eip; |
38ba30ba | 2717 | ctxt->eflags = tss->eflags | 2; |
4cee4798 KW |
2718 | |
2719 | /* General purpose registers */ | |
dd856efa AK |
2720 | *reg_write(ctxt, VCPU_REGS_RAX) = tss->eax; |
2721 | *reg_write(ctxt, VCPU_REGS_RCX) = tss->ecx; | |
2722 | *reg_write(ctxt, VCPU_REGS_RDX) = tss->edx; | |
2723 | *reg_write(ctxt, VCPU_REGS_RBX) = tss->ebx; | |
2724 | *reg_write(ctxt, VCPU_REGS_RSP) = tss->esp; | |
2725 | *reg_write(ctxt, VCPU_REGS_RBP) = tss->ebp; | |
2726 | *reg_write(ctxt, VCPU_REGS_RSI) = tss->esi; | |
2727 | *reg_write(ctxt, VCPU_REGS_RDI) = tss->edi; | |
38ba30ba GN |
2728 | |
2729 | /* | |
2730 | * SDM says that segment selectors are loaded before segment | |
2356aaeb PB |
2731 | * descriptors. This is important because CPL checks will |
2732 | * use CS.RPL. | |
38ba30ba | 2733 | */ |
1aa36616 AK |
2734 | set_segment_selector(ctxt, tss->ldt_selector, VCPU_SREG_LDTR); |
2735 | set_segment_selector(ctxt, tss->es, VCPU_SREG_ES); | |
2736 | set_segment_selector(ctxt, tss->cs, VCPU_SREG_CS); | |
2737 | set_segment_selector(ctxt, tss->ss, VCPU_SREG_SS); | |
2738 | set_segment_selector(ctxt, tss->ds, VCPU_SREG_DS); | |
2739 | set_segment_selector(ctxt, tss->fs, VCPU_SREG_FS); | |
2740 | set_segment_selector(ctxt, tss->gs, VCPU_SREG_GS); | |
38ba30ba | 2741 | |
4cee4798 KW |
2742 | /* |
2743 | * If we're switching between Protected Mode and VM86, we need to make | |
2744 | * sure to update the mode before loading the segment descriptors so | |
2745 | * that the selectors are interpreted correctly. | |
4cee4798 | 2746 | */ |
2356aaeb | 2747 | if (ctxt->eflags & X86_EFLAGS_VM) { |
4cee4798 | 2748 | ctxt->mode = X86EMUL_MODE_VM86; |
2356aaeb PB |
2749 | cpl = 3; |
2750 | } else { | |
4cee4798 | 2751 | ctxt->mode = X86EMUL_MODE_PROT32; |
2356aaeb PB |
2752 | cpl = tss->cs & 3; |
2753 | } | |
4cee4798 | 2754 | |
38ba30ba GN |
2755 | /* |
2756 | * Now load segment descriptors. If fault happenes at this stage | |
2757 | * it is handled in a context of new task | |
2758 | */ | |
d1442d85 | 2759 | ret = __load_segment_descriptor(ctxt, tss->ldt_selector, VCPU_SREG_LDTR, |
3dc4bc4f | 2760 | cpl, X86_TRANSFER_TASK_SWITCH, NULL); |
38ba30ba GN |
2761 | if (ret != X86EMUL_CONTINUE) |
2762 | return ret; | |
d1442d85 | 2763 | ret = __load_segment_descriptor(ctxt, tss->es, VCPU_SREG_ES, cpl, |
3dc4bc4f | 2764 | X86_TRANSFER_TASK_SWITCH, NULL); |
38ba30ba GN |
2765 | if (ret != X86EMUL_CONTINUE) |
2766 | return ret; | |
d1442d85 | 2767 | ret = __load_segment_descriptor(ctxt, tss->cs, VCPU_SREG_CS, cpl, |
3dc4bc4f | 2768 | X86_TRANSFER_TASK_SWITCH, NULL); |
38ba30ba GN |
2769 | if (ret != X86EMUL_CONTINUE) |
2770 | return ret; | |
d1442d85 | 2771 | ret = __load_segment_descriptor(ctxt, tss->ss, VCPU_SREG_SS, cpl, |
3dc4bc4f | 2772 | X86_TRANSFER_TASK_SWITCH, NULL); |
38ba30ba GN |
2773 | if (ret != X86EMUL_CONTINUE) |
2774 | return ret; | |
d1442d85 | 2775 | ret = __load_segment_descriptor(ctxt, tss->ds, VCPU_SREG_DS, cpl, |
3dc4bc4f | 2776 | X86_TRANSFER_TASK_SWITCH, NULL); |
38ba30ba GN |
2777 | if (ret != X86EMUL_CONTINUE) |
2778 | return ret; | |
d1442d85 | 2779 | ret = __load_segment_descriptor(ctxt, tss->fs, VCPU_SREG_FS, cpl, |
3dc4bc4f | 2780 | X86_TRANSFER_TASK_SWITCH, NULL); |
38ba30ba GN |
2781 | if (ret != X86EMUL_CONTINUE) |
2782 | return ret; | |
d1442d85 | 2783 | ret = __load_segment_descriptor(ctxt, tss->gs, VCPU_SREG_GS, cpl, |
3dc4bc4f | 2784 | X86_TRANSFER_TASK_SWITCH, NULL); |
38ba30ba GN |
2785 | if (ret != X86EMUL_CONTINUE) |
2786 | return ret; | |
2787 | ||
2788 | return X86EMUL_CONTINUE; | |
2789 | } | |
2790 | ||
2791 | static int task_switch_32(struct x86_emulate_ctxt *ctxt, | |
38ba30ba GN |
2792 | u16 tss_selector, u16 old_tss_sel, |
2793 | ulong old_tss_base, struct desc_struct *new_desc) | |
2794 | { | |
0225fb50 | 2795 | const struct x86_emulate_ops *ops = ctxt->ops; |
38ba30ba GN |
2796 | struct tss_segment_32 tss_seg; |
2797 | int ret; | |
bcc55cba | 2798 | u32 new_tss_base = get_desc_base(new_desc); |
5c7411e2 NA |
2799 | u32 eip_offset = offsetof(struct tss_segment_32, eip); |
2800 | u32 ldt_sel_offset = offsetof(struct tss_segment_32, ldt_selector); | |
38ba30ba | 2801 | |
0f65dd70 | 2802 | ret = ops->read_std(ctxt, old_tss_base, &tss_seg, sizeof tss_seg, |
bcc55cba | 2803 | &ctxt->exception); |
db297e3d | 2804 | if (ret != X86EMUL_CONTINUE) |
38ba30ba | 2805 | return ret; |
38ba30ba | 2806 | |
7b105ca2 | 2807 | save_state_to_tss32(ctxt, &tss_seg); |
38ba30ba | 2808 | |
5c7411e2 NA |
2809 | /* Only GP registers and segment selectors are saved */ |
2810 | ret = ops->write_std(ctxt, old_tss_base + eip_offset, &tss_seg.eip, | |
2811 | ldt_sel_offset - eip_offset, &ctxt->exception); | |
db297e3d | 2812 | if (ret != X86EMUL_CONTINUE) |
38ba30ba | 2813 | return ret; |
38ba30ba | 2814 | |
0f65dd70 | 2815 | ret = ops->read_std(ctxt, new_tss_base, &tss_seg, sizeof tss_seg, |
bcc55cba | 2816 | &ctxt->exception); |
db297e3d | 2817 | if (ret != X86EMUL_CONTINUE) |
38ba30ba | 2818 | return ret; |
38ba30ba GN |
2819 | |
2820 | if (old_tss_sel != 0xffff) { | |
2821 | tss_seg.prev_task_link = old_tss_sel; | |
2822 | ||
0f65dd70 | 2823 | ret = ops->write_std(ctxt, new_tss_base, |
38ba30ba GN |
2824 | &tss_seg.prev_task_link, |
2825 | sizeof tss_seg.prev_task_link, | |
0f65dd70 | 2826 | &ctxt->exception); |
db297e3d | 2827 | if (ret != X86EMUL_CONTINUE) |
38ba30ba | 2828 | return ret; |
38ba30ba GN |
2829 | } |
2830 | ||
7b105ca2 | 2831 | return load_state_from_tss32(ctxt, &tss_seg); |
38ba30ba GN |
2832 | } |
2833 | ||
2834 | static int emulator_do_task_switch(struct x86_emulate_ctxt *ctxt, | |
7f3d35fd | 2835 | u16 tss_selector, int idt_index, int reason, |
e269fb21 | 2836 | bool has_error_code, u32 error_code) |
38ba30ba | 2837 | { |
0225fb50 | 2838 | const struct x86_emulate_ops *ops = ctxt->ops; |
38ba30ba GN |
2839 | struct desc_struct curr_tss_desc, next_tss_desc; |
2840 | int ret; | |
1aa36616 | 2841 | u16 old_tss_sel = get_segment_selector(ctxt, VCPU_SREG_TR); |
38ba30ba | 2842 | ulong old_tss_base = |
4bff1e86 | 2843 | ops->get_cached_segment_base(ctxt, VCPU_SREG_TR); |
ceffb459 | 2844 | u32 desc_limit; |
e919464b | 2845 | ulong desc_addr; |
38ba30ba GN |
2846 | |
2847 | /* FIXME: old_tss_base == ~0 ? */ | |
2848 | ||
e919464b | 2849 | ret = read_segment_descriptor(ctxt, tss_selector, &next_tss_desc, &desc_addr); |
38ba30ba GN |
2850 | if (ret != X86EMUL_CONTINUE) |
2851 | return ret; | |
e919464b | 2852 | ret = read_segment_descriptor(ctxt, old_tss_sel, &curr_tss_desc, &desc_addr); |
38ba30ba GN |
2853 | if (ret != X86EMUL_CONTINUE) |
2854 | return ret; | |
2855 | ||
2856 | /* FIXME: check that next_tss_desc is tss */ | |
2857 | ||
7f3d35fd KW |
2858 | /* |
2859 | * Check privileges. The three cases are task switch caused by... | |
2860 | * | |
2861 | * 1. jmp/call/int to task gate: Check against DPL of the task gate | |
2862 | * 2. Exception/IRQ/iret: No check is performed | |
2c2ca2d1 NA |
2863 | * 3. jmp/call to TSS/task-gate: No check is performed since the |
2864 | * hardware checks it before exiting. | |
7f3d35fd KW |
2865 | */ |
2866 | if (reason == TASK_SWITCH_GATE) { | |
2867 | if (idt_index != -1) { | |
2868 | /* Software interrupts */ | |
2869 | struct desc_struct task_gate_desc; | |
2870 | int dpl; | |
2871 | ||
2872 | ret = read_interrupt_descriptor(ctxt, idt_index, | |
2873 | &task_gate_desc); | |
2874 | if (ret != X86EMUL_CONTINUE) | |
2875 | return ret; | |
2876 | ||
2877 | dpl = task_gate_desc.dpl; | |
2878 | if ((tss_selector & 3) > dpl || ops->cpl(ctxt) > dpl) | |
2879 | return emulate_gp(ctxt, (idt_index << 3) | 0x2); | |
2880 | } | |
38ba30ba GN |
2881 | } |
2882 | ||
ceffb459 GN |
2883 | desc_limit = desc_limit_scaled(&next_tss_desc); |
2884 | if (!next_tss_desc.p || | |
2885 | ((desc_limit < 0x67 && (next_tss_desc.type & 8)) || | |
2886 | desc_limit < 0x2b)) { | |
592f0858 | 2887 | return emulate_ts(ctxt, tss_selector & 0xfffc); |
38ba30ba GN |
2888 | } |
2889 | ||
2890 | if (reason == TASK_SWITCH_IRET || reason == TASK_SWITCH_JMP) { | |
2891 | curr_tss_desc.type &= ~(1 << 1); /* clear busy flag */ | |
7b105ca2 | 2892 | write_segment_descriptor(ctxt, old_tss_sel, &curr_tss_desc); |
38ba30ba GN |
2893 | } |
2894 | ||
2895 | if (reason == TASK_SWITCH_IRET) | |
2896 | ctxt->eflags = ctxt->eflags & ~X86_EFLAGS_NT; | |
2897 | ||
2898 | /* set back link to prev task only if NT bit is set in eflags | |
fc058680 | 2899 | note that old_tss_sel is not used after this point */ |
38ba30ba GN |
2900 | if (reason != TASK_SWITCH_CALL && reason != TASK_SWITCH_GATE) |
2901 | old_tss_sel = 0xffff; | |
2902 | ||
2903 | if (next_tss_desc.type & 8) | |
7b105ca2 | 2904 | ret = task_switch_32(ctxt, tss_selector, old_tss_sel, |
38ba30ba GN |
2905 | old_tss_base, &next_tss_desc); |
2906 | else | |
7b105ca2 | 2907 | ret = task_switch_16(ctxt, tss_selector, old_tss_sel, |
38ba30ba | 2908 | old_tss_base, &next_tss_desc); |
0760d448 JK |
2909 | if (ret != X86EMUL_CONTINUE) |
2910 | return ret; | |
38ba30ba GN |
2911 | |
2912 | if (reason == TASK_SWITCH_CALL || reason == TASK_SWITCH_GATE) | |
2913 | ctxt->eflags = ctxt->eflags | X86_EFLAGS_NT; | |
2914 | ||
2915 | if (reason != TASK_SWITCH_IRET) { | |
2916 | next_tss_desc.type |= (1 << 1); /* set busy flag */ | |
7b105ca2 | 2917 | write_segment_descriptor(ctxt, tss_selector, &next_tss_desc); |
38ba30ba GN |
2918 | } |
2919 | ||
717746e3 | 2920 | ops->set_cr(ctxt, 0, ops->get_cr(ctxt, 0) | X86_CR0_TS); |
1aa36616 | 2921 | ops->set_segment(ctxt, tss_selector, &next_tss_desc, 0, VCPU_SREG_TR); |
38ba30ba | 2922 | |
e269fb21 | 2923 | if (has_error_code) { |
9dac77fa AK |
2924 | ctxt->op_bytes = ctxt->ad_bytes = (next_tss_desc.type & 8) ? 4 : 2; |
2925 | ctxt->lock_prefix = 0; | |
2926 | ctxt->src.val = (unsigned long) error_code; | |
4487b3b4 | 2927 | ret = em_push(ctxt); |
e269fb21 JK |
2928 | } |
2929 | ||
38ba30ba GN |
2930 | return ret; |
2931 | } | |
2932 | ||
2933 | int emulator_task_switch(struct x86_emulate_ctxt *ctxt, | |
7f3d35fd | 2934 | u16 tss_selector, int idt_index, int reason, |
e269fb21 | 2935 | bool has_error_code, u32 error_code) |
38ba30ba | 2936 | { |
38ba30ba GN |
2937 | int rc; |
2938 | ||
dd856efa | 2939 | invalidate_registers(ctxt); |
9dac77fa AK |
2940 | ctxt->_eip = ctxt->eip; |
2941 | ctxt->dst.type = OP_NONE; | |
38ba30ba | 2942 | |
7f3d35fd | 2943 | rc = emulator_do_task_switch(ctxt, tss_selector, idt_index, reason, |
e269fb21 | 2944 | has_error_code, error_code); |
38ba30ba | 2945 | |
dd856efa | 2946 | if (rc == X86EMUL_CONTINUE) { |
9dac77fa | 2947 | ctxt->eip = ctxt->_eip; |
dd856efa AK |
2948 | writeback_registers(ctxt); |
2949 | } | |
38ba30ba | 2950 | |
a0c0ab2f | 2951 | return (rc == X86EMUL_UNHANDLEABLE) ? EMULATION_FAILED : EMULATION_OK; |
38ba30ba GN |
2952 | } |
2953 | ||
f3bd64c6 GN |
2954 | static void string_addr_inc(struct x86_emulate_ctxt *ctxt, int reg, |
2955 | struct operand *op) | |
a682e354 | 2956 | { |
b3356bf0 | 2957 | int df = (ctxt->eflags & EFLG_DF) ? -op->count : op->count; |
a682e354 | 2958 | |
01485a22 PB |
2959 | register_address_increment(ctxt, reg, df * op->bytes); |
2960 | op->addr.mem.ea = register_address(ctxt, reg); | |
a682e354 GN |
2961 | } |
2962 | ||
7af04fc0 AK |
2963 | static int em_das(struct x86_emulate_ctxt *ctxt) |
2964 | { | |
7af04fc0 AK |
2965 | u8 al, old_al; |
2966 | bool af, cf, old_cf; | |
2967 | ||
2968 | cf = ctxt->eflags & X86_EFLAGS_CF; | |
9dac77fa | 2969 | al = ctxt->dst.val; |
7af04fc0 AK |
2970 | |
2971 | old_al = al; | |
2972 | old_cf = cf; | |
2973 | cf = false; | |
2974 | af = ctxt->eflags & X86_EFLAGS_AF; | |
2975 | if ((al & 0x0f) > 9 || af) { | |
2976 | al -= 6; | |
2977 | cf = old_cf | (al >= 250); | |
2978 | af = true; | |
2979 | } else { | |
2980 | af = false; | |
2981 | } | |
2982 | if (old_al > 0x99 || old_cf) { | |
2983 | al -= 0x60; | |
2984 | cf = true; | |
2985 | } | |
2986 | ||
9dac77fa | 2987 | ctxt->dst.val = al; |
7af04fc0 | 2988 | /* Set PF, ZF, SF */ |
9dac77fa AK |
2989 | ctxt->src.type = OP_IMM; |
2990 | ctxt->src.val = 0; | |
2991 | ctxt->src.bytes = 1; | |
158de57f | 2992 | fastop(ctxt, em_or); |
7af04fc0 AK |
2993 | ctxt->eflags &= ~(X86_EFLAGS_AF | X86_EFLAGS_CF); |
2994 | if (cf) | |
2995 | ctxt->eflags |= X86_EFLAGS_CF; | |
2996 | if (af) | |
2997 | ctxt->eflags |= X86_EFLAGS_AF; | |
2998 | return X86EMUL_CONTINUE; | |
2999 | } | |
3000 | ||
a035d5c6 PB |
3001 | static int em_aam(struct x86_emulate_ctxt *ctxt) |
3002 | { | |
3003 | u8 al, ah; | |
3004 | ||
3005 | if (ctxt->src.val == 0) | |
3006 | return emulate_de(ctxt); | |
3007 | ||
3008 | al = ctxt->dst.val & 0xff; | |
3009 | ah = al / ctxt->src.val; | |
3010 | al %= ctxt->src.val; | |
3011 | ||
3012 | ctxt->dst.val = (ctxt->dst.val & 0xffff0000) | al | (ah << 8); | |
3013 | ||
3014 | /* Set PF, ZF, SF */ | |
3015 | ctxt->src.type = OP_IMM; | |
3016 | ctxt->src.val = 0; | |
3017 | ctxt->src.bytes = 1; | |
3018 | fastop(ctxt, em_or); | |
3019 | ||
3020 | return X86EMUL_CONTINUE; | |
3021 | } | |
3022 | ||
7f662273 GN |
3023 | static int em_aad(struct x86_emulate_ctxt *ctxt) |
3024 | { | |
3025 | u8 al = ctxt->dst.val & 0xff; | |
3026 | u8 ah = (ctxt->dst.val >> 8) & 0xff; | |
3027 | ||
3028 | al = (al + (ah * ctxt->src.val)) & 0xff; | |
3029 | ||
3030 | ctxt->dst.val = (ctxt->dst.val & 0xffff0000) | al; | |
3031 | ||
f583c29b GN |
3032 | /* Set PF, ZF, SF */ |
3033 | ctxt->src.type = OP_IMM; | |
3034 | ctxt->src.val = 0; | |
3035 | ctxt->src.bytes = 1; | |
3036 | fastop(ctxt, em_or); | |
7f662273 GN |
3037 | |
3038 | return X86EMUL_CONTINUE; | |
3039 | } | |
3040 | ||
d4ddafcd TY |
3041 | static int em_call(struct x86_emulate_ctxt *ctxt) |
3042 | { | |
234f3ce4 | 3043 | int rc; |
d4ddafcd TY |
3044 | long rel = ctxt->src.val; |
3045 | ||
3046 | ctxt->src.val = (unsigned long)ctxt->_eip; | |
234f3ce4 NA |
3047 | rc = jmp_rel(ctxt, rel); |
3048 | if (rc != X86EMUL_CONTINUE) | |
3049 | return rc; | |
d4ddafcd TY |
3050 | return em_push(ctxt); |
3051 | } | |
3052 | ||
0ef753b8 AK |
3053 | static int em_call_far(struct x86_emulate_ctxt *ctxt) |
3054 | { | |
0ef753b8 AK |
3055 | u16 sel, old_cs; |
3056 | ulong old_eip; | |
3057 | int rc; | |
d1442d85 NA |
3058 | struct desc_struct old_desc, new_desc; |
3059 | const struct x86_emulate_ops *ops = ctxt->ops; | |
3060 | int cpl = ctxt->ops->cpl(ctxt); | |
82268083 | 3061 | enum x86emul_mode prev_mode = ctxt->mode; |
0ef753b8 | 3062 | |
9dac77fa | 3063 | old_eip = ctxt->_eip; |
d1442d85 | 3064 | ops->get_segment(ctxt, &old_cs, &old_desc, NULL, VCPU_SREG_CS); |
0ef753b8 | 3065 | |
9dac77fa | 3066 | memcpy(&sel, ctxt->src.valptr + ctxt->op_bytes, 2); |
3dc4bc4f NA |
3067 | rc = __load_segment_descriptor(ctxt, sel, VCPU_SREG_CS, cpl, |
3068 | X86_TRANSFER_CALL_JMP, &new_desc); | |
d1442d85 | 3069 | if (rc != X86EMUL_CONTINUE) |
80976dbb | 3070 | return rc; |
0ef753b8 | 3071 | |
d50eaa18 | 3072 | rc = assign_eip_far(ctxt, ctxt->src.val, &new_desc); |
d1442d85 NA |
3073 | if (rc != X86EMUL_CONTINUE) |
3074 | goto fail; | |
0ef753b8 | 3075 | |
9dac77fa | 3076 | ctxt->src.val = old_cs; |
4487b3b4 | 3077 | rc = em_push(ctxt); |
0ef753b8 | 3078 | if (rc != X86EMUL_CONTINUE) |
d1442d85 | 3079 | goto fail; |
0ef753b8 | 3080 | |
9dac77fa | 3081 | ctxt->src.val = old_eip; |
d1442d85 NA |
3082 | rc = em_push(ctxt); |
3083 | /* If we failed, we tainted the memory, but the very least we should | |
3084 | restore cs */ | |
82268083 NA |
3085 | if (rc != X86EMUL_CONTINUE) { |
3086 | pr_warn_once("faulting far call emulation tainted memory\n"); | |
d1442d85 | 3087 | goto fail; |
82268083 | 3088 | } |
d1442d85 NA |
3089 | return rc; |
3090 | fail: | |
3091 | ops->set_segment(ctxt, old_cs, &old_desc, 0, VCPU_SREG_CS); | |
82268083 | 3092 | ctxt->mode = prev_mode; |
d1442d85 NA |
3093 | return rc; |
3094 | ||
0ef753b8 AK |
3095 | } |
3096 | ||
40ece7c7 AK |
3097 | static int em_ret_near_imm(struct x86_emulate_ctxt *ctxt) |
3098 | { | |
40ece7c7 | 3099 | int rc; |
234f3ce4 | 3100 | unsigned long eip; |
40ece7c7 | 3101 | |
234f3ce4 NA |
3102 | rc = emulate_pop(ctxt, &eip, ctxt->op_bytes); |
3103 | if (rc != X86EMUL_CONTINUE) | |
3104 | return rc; | |
3105 | rc = assign_eip_near(ctxt, eip); | |
40ece7c7 AK |
3106 | if (rc != X86EMUL_CONTINUE) |
3107 | return rc; | |
5ad105e5 | 3108 | rsp_increment(ctxt, ctxt->src.val); |
40ece7c7 AK |
3109 | return X86EMUL_CONTINUE; |
3110 | } | |
3111 | ||
e4f973ae TY |
3112 | static int em_xchg(struct x86_emulate_ctxt *ctxt) |
3113 | { | |
e4f973ae | 3114 | /* Write back the register source. */ |
9dac77fa AK |
3115 | ctxt->src.val = ctxt->dst.val; |
3116 | write_register_operand(&ctxt->src); | |
e4f973ae TY |
3117 | |
3118 | /* Write back the memory destination with implicit LOCK prefix. */ | |
9dac77fa AK |
3119 | ctxt->dst.val = ctxt->src.orig_val; |
3120 | ctxt->lock_prefix = 1; | |
e4f973ae TY |
3121 | return X86EMUL_CONTINUE; |
3122 | } | |
3123 | ||
5c82aa29 AK |
3124 | static int em_imul_3op(struct x86_emulate_ctxt *ctxt) |
3125 | { | |
9dac77fa | 3126 | ctxt->dst.val = ctxt->src2.val; |
4d758349 | 3127 | return fastop(ctxt, em_imul); |
5c82aa29 AK |
3128 | } |
3129 | ||
61429142 AK |
3130 | static int em_cwd(struct x86_emulate_ctxt *ctxt) |
3131 | { | |
9dac77fa AK |
3132 | ctxt->dst.type = OP_REG; |
3133 | ctxt->dst.bytes = ctxt->src.bytes; | |
dd856efa | 3134 | ctxt->dst.addr.reg = reg_rmw(ctxt, VCPU_REGS_RDX); |
9dac77fa | 3135 | ctxt->dst.val = ~((ctxt->src.val >> (ctxt->src.bytes * 8 - 1)) - 1); |
61429142 AK |
3136 | |
3137 | return X86EMUL_CONTINUE; | |
3138 | } | |
3139 | ||
48bb5d3c AK |
3140 | static int em_rdtsc(struct x86_emulate_ctxt *ctxt) |
3141 | { | |
48bb5d3c AK |
3142 | u64 tsc = 0; |
3143 | ||
717746e3 | 3144 | ctxt->ops->get_msr(ctxt, MSR_IA32_TSC, &tsc); |
dd856efa AK |
3145 | *reg_write(ctxt, VCPU_REGS_RAX) = (u32)tsc; |
3146 | *reg_write(ctxt, VCPU_REGS_RDX) = tsc >> 32; | |
48bb5d3c AK |
3147 | return X86EMUL_CONTINUE; |
3148 | } | |
3149 | ||
222d21aa AK |
3150 | static int em_rdpmc(struct x86_emulate_ctxt *ctxt) |
3151 | { | |
3152 | u64 pmc; | |
3153 | ||
dd856efa | 3154 | if (ctxt->ops->read_pmc(ctxt, reg_read(ctxt, VCPU_REGS_RCX), &pmc)) |
222d21aa | 3155 | return emulate_gp(ctxt, 0); |
dd856efa AK |
3156 | *reg_write(ctxt, VCPU_REGS_RAX) = (u32)pmc; |
3157 | *reg_write(ctxt, VCPU_REGS_RDX) = pmc >> 32; | |
222d21aa AK |
3158 | return X86EMUL_CONTINUE; |
3159 | } | |
3160 | ||
b9eac5f4 AK |
3161 | static int em_mov(struct x86_emulate_ctxt *ctxt) |
3162 | { | |
54cfdb3e | 3163 | memcpy(ctxt->dst.valptr, ctxt->src.valptr, sizeof(ctxt->src.valptr)); |
b9eac5f4 AK |
3164 | return X86EMUL_CONTINUE; |
3165 | } | |
3166 | ||
84cffe49 BP |
3167 | #define FFL(x) bit(X86_FEATURE_##x) |
3168 | ||
3169 | static int em_movbe(struct x86_emulate_ctxt *ctxt) | |
3170 | { | |
3171 | u32 ebx, ecx, edx, eax = 1; | |
3172 | u16 tmp; | |
3173 | ||
3174 | /* | |
3175 | * Check MOVBE is set in the guest-visible CPUID leaf. | |
3176 | */ | |
3177 | ctxt->ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx); | |
3178 | if (!(ecx & FFL(MOVBE))) | |
3179 | return emulate_ud(ctxt); | |
3180 | ||
3181 | switch (ctxt->op_bytes) { | |
3182 | case 2: | |
3183 | /* | |
3184 | * From MOVBE definition: "...When the operand size is 16 bits, | |
3185 | * the upper word of the destination register remains unchanged | |
3186 | * ..." | |
3187 | * | |
3188 | * Both casting ->valptr and ->val to u16 breaks strict aliasing | |
3189 | * rules so we have to do the operation almost per hand. | |
3190 | */ | |
3191 | tmp = (u16)ctxt->src.val; | |
3192 | ctxt->dst.val &= ~0xffffUL; | |
3193 | ctxt->dst.val |= (unsigned long)swab16(tmp); | |
3194 | break; | |
3195 | case 4: | |
3196 | ctxt->dst.val = swab32((u32)ctxt->src.val); | |
3197 | break; | |
3198 | case 8: | |
3199 | ctxt->dst.val = swab64(ctxt->src.val); | |
3200 | break; | |
3201 | default: | |
592f0858 | 3202 | BUG(); |
84cffe49 BP |
3203 | } |
3204 | return X86EMUL_CONTINUE; | |
3205 | } | |
3206 | ||
bc00f8d2 TY |
3207 | static int em_cr_write(struct x86_emulate_ctxt *ctxt) |
3208 | { | |
3209 | if (ctxt->ops->set_cr(ctxt, ctxt->modrm_reg, ctxt->src.val)) | |
3210 | return emulate_gp(ctxt, 0); | |
3211 | ||
3212 | /* Disable writeback. */ | |
3213 | ctxt->dst.type = OP_NONE; | |
3214 | return X86EMUL_CONTINUE; | |
3215 | } | |
3216 | ||
3217 | static int em_dr_write(struct x86_emulate_ctxt *ctxt) | |
3218 | { | |
3219 | unsigned long val; | |
3220 | ||
3221 | if (ctxt->mode == X86EMUL_MODE_PROT64) | |
3222 | val = ctxt->src.val & ~0ULL; | |
3223 | else | |
3224 | val = ctxt->src.val & ~0U; | |
3225 | ||
3226 | /* #UD condition is already handled. */ | |
3227 | if (ctxt->ops->set_dr(ctxt, ctxt->modrm_reg, val) < 0) | |
3228 | return emulate_gp(ctxt, 0); | |
3229 | ||
3230 | /* Disable writeback. */ | |
3231 | ctxt->dst.type = OP_NONE; | |
3232 | return X86EMUL_CONTINUE; | |
3233 | } | |
3234 | ||
e1e210b0 TY |
3235 | static int em_wrmsr(struct x86_emulate_ctxt *ctxt) |
3236 | { | |
3237 | u64 msr_data; | |
3238 | ||
dd856efa AK |
3239 | msr_data = (u32)reg_read(ctxt, VCPU_REGS_RAX) |
3240 | | ((u64)reg_read(ctxt, VCPU_REGS_RDX) << 32); | |
3241 | if (ctxt->ops->set_msr(ctxt, reg_read(ctxt, VCPU_REGS_RCX), msr_data)) | |
e1e210b0 TY |
3242 | return emulate_gp(ctxt, 0); |
3243 | ||
3244 | return X86EMUL_CONTINUE; | |
3245 | } | |
3246 | ||
3247 | static int em_rdmsr(struct x86_emulate_ctxt *ctxt) | |
3248 | { | |
3249 | u64 msr_data; | |
3250 | ||
dd856efa | 3251 | if (ctxt->ops->get_msr(ctxt, reg_read(ctxt, VCPU_REGS_RCX), &msr_data)) |
e1e210b0 TY |
3252 | return emulate_gp(ctxt, 0); |
3253 | ||
dd856efa AK |
3254 | *reg_write(ctxt, VCPU_REGS_RAX) = (u32)msr_data; |
3255 | *reg_write(ctxt, VCPU_REGS_RDX) = msr_data >> 32; | |
e1e210b0 TY |
3256 | return X86EMUL_CONTINUE; |
3257 | } | |
3258 | ||
1bd5f469 TY |
3259 | static int em_mov_rm_sreg(struct x86_emulate_ctxt *ctxt) |
3260 | { | |
9dac77fa | 3261 | if (ctxt->modrm_reg > VCPU_SREG_GS) |
1bd5f469 TY |
3262 | return emulate_ud(ctxt); |
3263 | ||
9dac77fa | 3264 | ctxt->dst.val = get_segment_selector(ctxt, ctxt->modrm_reg); |
b5bbf10e NA |
3265 | if (ctxt->dst.bytes == 4 && ctxt->dst.type == OP_MEM) |
3266 | ctxt->dst.bytes = 2; | |
1bd5f469 TY |
3267 | return X86EMUL_CONTINUE; |
3268 | } | |
3269 | ||
3270 | static int em_mov_sreg_rm(struct x86_emulate_ctxt *ctxt) | |
3271 | { | |
9dac77fa | 3272 | u16 sel = ctxt->src.val; |
1bd5f469 | 3273 | |
9dac77fa | 3274 | if (ctxt->modrm_reg == VCPU_SREG_CS || ctxt->modrm_reg > VCPU_SREG_GS) |
1bd5f469 TY |
3275 | return emulate_ud(ctxt); |
3276 | ||
9dac77fa | 3277 | if (ctxt->modrm_reg == VCPU_SREG_SS) |
1bd5f469 TY |
3278 | ctxt->interruptibility = KVM_X86_SHADOW_INT_MOV_SS; |
3279 | ||
3280 | /* Disable writeback. */ | |
9dac77fa AK |
3281 | ctxt->dst.type = OP_NONE; |
3282 | return load_segment_descriptor(ctxt, sel, ctxt->modrm_reg); | |
1bd5f469 TY |
3283 | } |
3284 | ||
a14e579f AK |
3285 | static int em_lldt(struct x86_emulate_ctxt *ctxt) |
3286 | { | |
3287 | u16 sel = ctxt->src.val; | |
3288 | ||
3289 | /* Disable writeback. */ | |
3290 | ctxt->dst.type = OP_NONE; | |
3291 | return load_segment_descriptor(ctxt, sel, VCPU_SREG_LDTR); | |
3292 | } | |
3293 | ||
80890006 AK |
3294 | static int em_ltr(struct x86_emulate_ctxt *ctxt) |
3295 | { | |
3296 | u16 sel = ctxt->src.val; | |
3297 | ||
3298 | /* Disable writeback. */ | |
3299 | ctxt->dst.type = OP_NONE; | |
3300 | return load_segment_descriptor(ctxt, sel, VCPU_SREG_TR); | |
3301 | } | |
3302 | ||
38503911 AK |
3303 | static int em_invlpg(struct x86_emulate_ctxt *ctxt) |
3304 | { | |
9fa088f4 AK |
3305 | int rc; |
3306 | ulong linear; | |
3307 | ||
9dac77fa | 3308 | rc = linearize(ctxt, ctxt->src.addr.mem, 1, false, &linear); |
9fa088f4 | 3309 | if (rc == X86EMUL_CONTINUE) |
3cb16fe7 | 3310 | ctxt->ops->invlpg(ctxt, linear); |
38503911 | 3311 | /* Disable writeback. */ |
9dac77fa | 3312 | ctxt->dst.type = OP_NONE; |
38503911 AK |
3313 | return X86EMUL_CONTINUE; |
3314 | } | |
3315 | ||
2d04a05b AK |
3316 | static int em_clts(struct x86_emulate_ctxt *ctxt) |
3317 | { | |
3318 | ulong cr0; | |
3319 | ||
3320 | cr0 = ctxt->ops->get_cr(ctxt, 0); | |
3321 | cr0 &= ~X86_CR0_TS; | |
3322 | ctxt->ops->set_cr(ctxt, 0, cr0); | |
3323 | return X86EMUL_CONTINUE; | |
3324 | } | |
3325 | ||
26d05cc7 AK |
3326 | static int em_vmcall(struct x86_emulate_ctxt *ctxt) |
3327 | { | |
0f54a321 | 3328 | int rc = ctxt->ops->fix_hypercall(ctxt); |
26d05cc7 | 3329 | |
26d05cc7 AK |
3330 | if (rc != X86EMUL_CONTINUE) |
3331 | return rc; | |
3332 | ||
3333 | /* Let the processor re-execute the fixed hypercall */ | |
9dac77fa | 3334 | ctxt->_eip = ctxt->eip; |
26d05cc7 | 3335 | /* Disable writeback. */ |
9dac77fa | 3336 | ctxt->dst.type = OP_NONE; |
26d05cc7 AK |
3337 | return X86EMUL_CONTINUE; |
3338 | } | |
3339 | ||
96051572 AK |
3340 | static int emulate_store_desc_ptr(struct x86_emulate_ctxt *ctxt, |
3341 | void (*get)(struct x86_emulate_ctxt *ctxt, | |
3342 | struct desc_ptr *ptr)) | |
3343 | { | |
3344 | struct desc_ptr desc_ptr; | |
3345 | ||
3346 | if (ctxt->mode == X86EMUL_MODE_PROT64) | |
3347 | ctxt->op_bytes = 8; | |
3348 | get(ctxt, &desc_ptr); | |
3349 | if (ctxt->op_bytes == 2) { | |
3350 | ctxt->op_bytes = 4; | |
3351 | desc_ptr.address &= 0x00ffffff; | |
3352 | } | |
3353 | /* Disable writeback. */ | |
3354 | ctxt->dst.type = OP_NONE; | |
3355 | return segmented_write(ctxt, ctxt->dst.addr.mem, | |
3356 | &desc_ptr, 2 + ctxt->op_bytes); | |
3357 | } | |
3358 | ||
3359 | static int em_sgdt(struct x86_emulate_ctxt *ctxt) | |
3360 | { | |
3361 | return emulate_store_desc_ptr(ctxt, ctxt->ops->get_gdt); | |
3362 | } | |
3363 | ||
3364 | static int em_sidt(struct x86_emulate_ctxt *ctxt) | |
3365 | { | |
3366 | return emulate_store_desc_ptr(ctxt, ctxt->ops->get_idt); | |
3367 | } | |
3368 | ||
5b7f6a1e | 3369 | static int em_lgdt_lidt(struct x86_emulate_ctxt *ctxt, bool lgdt) |
26d05cc7 | 3370 | { |
26d05cc7 AK |
3371 | struct desc_ptr desc_ptr; |
3372 | int rc; | |
3373 | ||
510425ff AK |
3374 | if (ctxt->mode == X86EMUL_MODE_PROT64) |
3375 | ctxt->op_bytes = 8; | |
9dac77fa | 3376 | rc = read_descriptor(ctxt, ctxt->src.addr.mem, |
26d05cc7 | 3377 | &desc_ptr.size, &desc_ptr.address, |
9dac77fa | 3378 | ctxt->op_bytes); |
26d05cc7 AK |
3379 | if (rc != X86EMUL_CONTINUE) |
3380 | return rc; | |
9a9abf6b NA |
3381 | if (ctxt->mode == X86EMUL_MODE_PROT64 && |
3382 | is_noncanonical_address(desc_ptr.address)) | |
3383 | return emulate_gp(ctxt, 0); | |
5b7f6a1e NA |
3384 | if (lgdt) |
3385 | ctxt->ops->set_gdt(ctxt, &desc_ptr); | |
3386 | else | |
3387 | ctxt->ops->set_idt(ctxt, &desc_ptr); | |
26d05cc7 | 3388 | /* Disable writeback. */ |
9dac77fa | 3389 | ctxt->dst.type = OP_NONE; |
26d05cc7 AK |
3390 | return X86EMUL_CONTINUE; |
3391 | } | |
3392 | ||
5b7f6a1e NA |
3393 | static int em_lgdt(struct x86_emulate_ctxt *ctxt) |
3394 | { | |
3395 | return em_lgdt_lidt(ctxt, true); | |
3396 | } | |
3397 | ||
5ef39c71 | 3398 | static int em_vmmcall(struct x86_emulate_ctxt *ctxt) |
26d05cc7 | 3399 | { |
26d05cc7 AK |
3400 | int rc; |
3401 | ||
5ef39c71 AK |
3402 | rc = ctxt->ops->fix_hypercall(ctxt); |
3403 | ||
26d05cc7 | 3404 | /* Disable writeback. */ |
9dac77fa | 3405 | ctxt->dst.type = OP_NONE; |
26d05cc7 AK |
3406 | return rc; |
3407 | } | |
3408 | ||
3409 | static int em_lidt(struct x86_emulate_ctxt *ctxt) | |
3410 | { | |
5b7f6a1e | 3411 | return em_lgdt_lidt(ctxt, false); |
26d05cc7 AK |
3412 | } |
3413 | ||
3414 | static int em_smsw(struct x86_emulate_ctxt *ctxt) | |
3415 | { | |
32e94d06 NA |
3416 | if (ctxt->dst.type == OP_MEM) |
3417 | ctxt->dst.bytes = 2; | |
9dac77fa | 3418 | ctxt->dst.val = ctxt->ops->get_cr(ctxt, 0); |
26d05cc7 AK |
3419 | return X86EMUL_CONTINUE; |
3420 | } | |
3421 | ||
3422 | static int em_lmsw(struct x86_emulate_ctxt *ctxt) | |
3423 | { | |
26d05cc7 | 3424 | ctxt->ops->set_cr(ctxt, 0, (ctxt->ops->get_cr(ctxt, 0) & ~0x0eul) |
9dac77fa AK |
3425 | | (ctxt->src.val & 0x0f)); |
3426 | ctxt->dst.type = OP_NONE; | |
26d05cc7 AK |
3427 | return X86EMUL_CONTINUE; |
3428 | } | |
3429 | ||
d06e03ad TY |
3430 | static int em_loop(struct x86_emulate_ctxt *ctxt) |
3431 | { | |
234f3ce4 NA |
3432 | int rc = X86EMUL_CONTINUE; |
3433 | ||
01485a22 | 3434 | register_address_increment(ctxt, VCPU_REGS_RCX, -1); |
dd856efa | 3435 | if ((address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) != 0) && |
9dac77fa | 3436 | (ctxt->b == 0xe2 || test_cc(ctxt->b ^ 0x5, ctxt->eflags))) |
234f3ce4 | 3437 | rc = jmp_rel(ctxt, ctxt->src.val); |
d06e03ad | 3438 | |
234f3ce4 | 3439 | return rc; |
d06e03ad TY |
3440 | } |
3441 | ||
3442 | static int em_jcxz(struct x86_emulate_ctxt *ctxt) | |
3443 | { | |
234f3ce4 NA |
3444 | int rc = X86EMUL_CONTINUE; |
3445 | ||
dd856efa | 3446 | if (address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) == 0) |
234f3ce4 | 3447 | rc = jmp_rel(ctxt, ctxt->src.val); |
d06e03ad | 3448 | |
234f3ce4 | 3449 | return rc; |
d06e03ad TY |
3450 | } |
3451 | ||
d7841a4b TY |
3452 | static int em_in(struct x86_emulate_ctxt *ctxt) |
3453 | { | |
3454 | if (!pio_in_emulated(ctxt, ctxt->dst.bytes, ctxt->src.val, | |
3455 | &ctxt->dst.val)) | |
3456 | return X86EMUL_IO_NEEDED; | |
3457 | ||
3458 | return X86EMUL_CONTINUE; | |
3459 | } | |
3460 | ||
3461 | static int em_out(struct x86_emulate_ctxt *ctxt) | |
3462 | { | |
3463 | ctxt->ops->pio_out_emulated(ctxt, ctxt->src.bytes, ctxt->dst.val, | |
3464 | &ctxt->src.val, 1); | |
3465 | /* Disable writeback. */ | |
3466 | ctxt->dst.type = OP_NONE; | |
3467 | return X86EMUL_CONTINUE; | |
3468 | } | |
3469 | ||
f411e6cd TY |
3470 | static int em_cli(struct x86_emulate_ctxt *ctxt) |
3471 | { | |
3472 | if (emulator_bad_iopl(ctxt)) | |
3473 | return emulate_gp(ctxt, 0); | |
3474 | ||
3475 | ctxt->eflags &= ~X86_EFLAGS_IF; | |
3476 | return X86EMUL_CONTINUE; | |
3477 | } | |
3478 | ||
3479 | static int em_sti(struct x86_emulate_ctxt *ctxt) | |
3480 | { | |
3481 | if (emulator_bad_iopl(ctxt)) | |
3482 | return emulate_gp(ctxt, 0); | |
3483 | ||
3484 | ctxt->interruptibility = KVM_X86_SHADOW_INT_STI; | |
3485 | ctxt->eflags |= X86_EFLAGS_IF; | |
3486 | return X86EMUL_CONTINUE; | |
3487 | } | |
3488 | ||
6d6eede4 AK |
3489 | static int em_cpuid(struct x86_emulate_ctxt *ctxt) |
3490 | { | |
3491 | u32 eax, ebx, ecx, edx; | |
3492 | ||
dd856efa AK |
3493 | eax = reg_read(ctxt, VCPU_REGS_RAX); |
3494 | ecx = reg_read(ctxt, VCPU_REGS_RCX); | |
6d6eede4 | 3495 | ctxt->ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx); |
dd856efa AK |
3496 | *reg_write(ctxt, VCPU_REGS_RAX) = eax; |
3497 | *reg_write(ctxt, VCPU_REGS_RBX) = ebx; | |
3498 | *reg_write(ctxt, VCPU_REGS_RCX) = ecx; | |
3499 | *reg_write(ctxt, VCPU_REGS_RDX) = edx; | |
6d6eede4 AK |
3500 | return X86EMUL_CONTINUE; |
3501 | } | |
3502 | ||
98f73630 PB |
3503 | static int em_sahf(struct x86_emulate_ctxt *ctxt) |
3504 | { | |
3505 | u32 flags; | |
3506 | ||
3507 | flags = EFLG_CF | EFLG_PF | EFLG_AF | EFLG_ZF | EFLG_SF; | |
3508 | flags &= *reg_rmw(ctxt, VCPU_REGS_RAX) >> 8; | |
3509 | ||
3510 | ctxt->eflags &= ~0xffUL; | |
3511 | ctxt->eflags |= flags | X86_EFLAGS_FIXED; | |
3512 | return X86EMUL_CONTINUE; | |
3513 | } | |
3514 | ||
2dd7caa0 AK |
3515 | static int em_lahf(struct x86_emulate_ctxt *ctxt) |
3516 | { | |
dd856efa AK |
3517 | *reg_rmw(ctxt, VCPU_REGS_RAX) &= ~0xff00UL; |
3518 | *reg_rmw(ctxt, VCPU_REGS_RAX) |= (ctxt->eflags & 0xff) << 8; | |
2dd7caa0 AK |
3519 | return X86EMUL_CONTINUE; |
3520 | } | |
3521 | ||
9299836e AK |
3522 | static int em_bswap(struct x86_emulate_ctxt *ctxt) |
3523 | { | |
3524 | switch (ctxt->op_bytes) { | |
3525 | #ifdef CONFIG_X86_64 | |
3526 | case 8: | |
3527 | asm("bswap %0" : "+r"(ctxt->dst.val)); | |
3528 | break; | |
3529 | #endif | |
3530 | default: | |
3531 | asm("bswap %0" : "+r"(*(u32 *)&ctxt->dst.val)); | |
3532 | break; | |
3533 | } | |
3534 | return X86EMUL_CONTINUE; | |
3535 | } | |
3536 | ||
13e457e0 NA |
3537 | static int em_clflush(struct x86_emulate_ctxt *ctxt) |
3538 | { | |
3539 | /* emulating clflush regardless of cpuid */ | |
3540 | return X86EMUL_CONTINUE; | |
3541 | } | |
3542 | ||
2276b511 NA |
3543 | static int em_movsxd(struct x86_emulate_ctxt *ctxt) |
3544 | { | |
3545 | ctxt->dst.val = (s32) ctxt->src.val; | |
3546 | return X86EMUL_CONTINUE; | |
3547 | } | |
3548 | ||
cfec82cb JR |
3549 | static bool valid_cr(int nr) |
3550 | { | |
3551 | switch (nr) { | |
3552 | case 0: | |
3553 | case 2 ... 4: | |
3554 | case 8: | |
3555 | return true; | |
3556 | default: | |
3557 | return false; | |
3558 | } | |
3559 | } | |
3560 | ||
3561 | static int check_cr_read(struct x86_emulate_ctxt *ctxt) | |
3562 | { | |
9dac77fa | 3563 | if (!valid_cr(ctxt->modrm_reg)) |
cfec82cb JR |
3564 | return emulate_ud(ctxt); |
3565 | ||
3566 | return X86EMUL_CONTINUE; | |
3567 | } | |
3568 | ||
3569 | static int check_cr_write(struct x86_emulate_ctxt *ctxt) | |
3570 | { | |
9dac77fa AK |
3571 | u64 new_val = ctxt->src.val64; |
3572 | int cr = ctxt->modrm_reg; | |
c2ad2bb3 | 3573 | u64 efer = 0; |
cfec82cb JR |
3574 | |
3575 | static u64 cr_reserved_bits[] = { | |
3576 | 0xffffffff00000000ULL, | |
3577 | 0, 0, 0, /* CR3 checked later */ | |
3578 | CR4_RESERVED_BITS, | |
3579 | 0, 0, 0, | |
3580 | CR8_RESERVED_BITS, | |
3581 | }; | |
3582 | ||
3583 | if (!valid_cr(cr)) | |
3584 | return emulate_ud(ctxt); | |
3585 | ||
3586 | if (new_val & cr_reserved_bits[cr]) | |
3587 | return emulate_gp(ctxt, 0); | |
3588 | ||
3589 | switch (cr) { | |
3590 | case 0: { | |
c2ad2bb3 | 3591 | u64 cr4; |
cfec82cb JR |
3592 | if (((new_val & X86_CR0_PG) && !(new_val & X86_CR0_PE)) || |
3593 | ((new_val & X86_CR0_NW) && !(new_val & X86_CR0_CD))) | |
3594 | return emulate_gp(ctxt, 0); | |
3595 | ||
717746e3 AK |
3596 | cr4 = ctxt->ops->get_cr(ctxt, 4); |
3597 | ctxt->ops->get_msr(ctxt, MSR_EFER, &efer); | |
cfec82cb JR |
3598 | |
3599 | if ((new_val & X86_CR0_PG) && (efer & EFER_LME) && | |
3600 | !(cr4 & X86_CR4_PAE)) | |
3601 | return emulate_gp(ctxt, 0); | |
3602 | ||
3603 | break; | |
3604 | } | |
3605 | case 3: { | |
3606 | u64 rsvd = 0; | |
3607 | ||
c2ad2bb3 AK |
3608 | ctxt->ops->get_msr(ctxt, MSR_EFER, &efer); |
3609 | if (efer & EFER_LMA) | |
9d88fca7 | 3610 | rsvd = CR3_L_MODE_RESERVED_BITS & ~CR3_PCID_INVD; |
cfec82cb JR |
3611 | |
3612 | if (new_val & rsvd) | |
3613 | return emulate_gp(ctxt, 0); | |
3614 | ||
3615 | break; | |
3616 | } | |
3617 | case 4: { | |
717746e3 | 3618 | ctxt->ops->get_msr(ctxt, MSR_EFER, &efer); |
cfec82cb JR |
3619 | |
3620 | if ((efer & EFER_LMA) && !(new_val & X86_CR4_PAE)) | |
3621 | return emulate_gp(ctxt, 0); | |
3622 | ||
3623 | break; | |
3624 | } | |
3625 | } | |
3626 | ||
3627 | return X86EMUL_CONTINUE; | |
3628 | } | |
3629 | ||
3b88e41a JR |
3630 | static int check_dr7_gd(struct x86_emulate_ctxt *ctxt) |
3631 | { | |
3632 | unsigned long dr7; | |
3633 | ||
717746e3 | 3634 | ctxt->ops->get_dr(ctxt, 7, &dr7); |
3b88e41a JR |
3635 | |
3636 | /* Check if DR7.Global_Enable is set */ | |
3637 | return dr7 & (1 << 13); | |
3638 | } | |
3639 | ||
3640 | static int check_dr_read(struct x86_emulate_ctxt *ctxt) | |
3641 | { | |
9dac77fa | 3642 | int dr = ctxt->modrm_reg; |
3b88e41a JR |
3643 | u64 cr4; |
3644 | ||
3645 | if (dr > 7) | |
3646 | return emulate_ud(ctxt); | |
3647 | ||
717746e3 | 3648 | cr4 = ctxt->ops->get_cr(ctxt, 4); |
3b88e41a JR |
3649 | if ((cr4 & X86_CR4_DE) && (dr == 4 || dr == 5)) |
3650 | return emulate_ud(ctxt); | |
3651 | ||
6d2a0526 NA |
3652 | if (check_dr7_gd(ctxt)) { |
3653 | ulong dr6; | |
3654 | ||
3655 | ctxt->ops->get_dr(ctxt, 6, &dr6); | |
3656 | dr6 &= ~15; | |
3657 | dr6 |= DR6_BD | DR6_RTM; | |
3658 | ctxt->ops->set_dr(ctxt, 6, dr6); | |
3b88e41a | 3659 | return emulate_db(ctxt); |
6d2a0526 | 3660 | } |
3b88e41a JR |
3661 | |
3662 | return X86EMUL_CONTINUE; | |
3663 | } | |
3664 | ||
3665 | static int check_dr_write(struct x86_emulate_ctxt *ctxt) | |
3666 | { | |
9dac77fa AK |
3667 | u64 new_val = ctxt->src.val64; |
3668 | int dr = ctxt->modrm_reg; | |
3b88e41a JR |
3669 | |
3670 | if ((dr == 6 || dr == 7) && (new_val & 0xffffffff00000000ULL)) | |
3671 | return emulate_gp(ctxt, 0); | |
3672 | ||
3673 | return check_dr_read(ctxt); | |
3674 | } | |
3675 | ||
01de8b09 JR |
3676 | static int check_svme(struct x86_emulate_ctxt *ctxt) |
3677 | { | |
3678 | u64 efer; | |
3679 | ||
717746e3 | 3680 | ctxt->ops->get_msr(ctxt, MSR_EFER, &efer); |
01de8b09 JR |
3681 | |
3682 | if (!(efer & EFER_SVME)) | |
3683 | return emulate_ud(ctxt); | |
3684 | ||
3685 | return X86EMUL_CONTINUE; | |
3686 | } | |
3687 | ||
3688 | static int check_svme_pa(struct x86_emulate_ctxt *ctxt) | |
3689 | { | |
dd856efa | 3690 | u64 rax = reg_read(ctxt, VCPU_REGS_RAX); |
01de8b09 JR |
3691 | |
3692 | /* Valid physical address? */ | |
d4224449 | 3693 | if (rax & 0xffff000000000000ULL) |
01de8b09 JR |
3694 | return emulate_gp(ctxt, 0); |
3695 | ||
3696 | return check_svme(ctxt); | |
3697 | } | |
3698 | ||
d7eb8203 JR |
3699 | static int check_rdtsc(struct x86_emulate_ctxt *ctxt) |
3700 | { | |
717746e3 | 3701 | u64 cr4 = ctxt->ops->get_cr(ctxt, 4); |
d7eb8203 | 3702 | |
717746e3 | 3703 | if (cr4 & X86_CR4_TSD && ctxt->ops->cpl(ctxt)) |
d7eb8203 JR |
3704 | return emulate_ud(ctxt); |
3705 | ||
3706 | return X86EMUL_CONTINUE; | |
3707 | } | |
3708 | ||
8061252e JR |
3709 | static int check_rdpmc(struct x86_emulate_ctxt *ctxt) |
3710 | { | |
717746e3 | 3711 | u64 cr4 = ctxt->ops->get_cr(ctxt, 4); |
dd856efa | 3712 | u64 rcx = reg_read(ctxt, VCPU_REGS_RCX); |
8061252e | 3713 | |
717746e3 | 3714 | if ((!(cr4 & X86_CR4_PCE) && ctxt->ops->cpl(ctxt)) || |
67f4d428 | 3715 | ctxt->ops->check_pmc(ctxt, rcx)) |
8061252e JR |
3716 | return emulate_gp(ctxt, 0); |
3717 | ||
3718 | return X86EMUL_CONTINUE; | |
3719 | } | |
3720 | ||
f6511935 JR |
3721 | static int check_perm_in(struct x86_emulate_ctxt *ctxt) |
3722 | { | |
9dac77fa AK |
3723 | ctxt->dst.bytes = min(ctxt->dst.bytes, 4u); |
3724 | if (!emulator_io_permited(ctxt, ctxt->src.val, ctxt->dst.bytes)) | |
f6511935 JR |
3725 | return emulate_gp(ctxt, 0); |
3726 | ||
3727 | return X86EMUL_CONTINUE; | |
3728 | } | |
3729 | ||
3730 | static int check_perm_out(struct x86_emulate_ctxt *ctxt) | |
3731 | { | |
9dac77fa AK |
3732 | ctxt->src.bytes = min(ctxt->src.bytes, 4u); |
3733 | if (!emulator_io_permited(ctxt, ctxt->dst.val, ctxt->src.bytes)) | |
f6511935 JR |
3734 | return emulate_gp(ctxt, 0); |
3735 | ||
3736 | return X86EMUL_CONTINUE; | |
3737 | } | |
3738 | ||
73fba5f4 | 3739 | #define D(_y) { .flags = (_y) } |
d40a6898 PB |
3740 | #define DI(_y, _i) { .flags = (_y)|Intercept, .intercept = x86_intercept_##_i } |
3741 | #define DIP(_y, _i, _p) { .flags = (_y)|Intercept|CheckPerm, \ | |
3742 | .intercept = x86_intercept_##_i, .check_perm = (_p) } | |
0b789eee | 3743 | #define N D(NotImpl) |
01de8b09 | 3744 | #define EXT(_f, _e) { .flags = ((_f) | RMExt), .u.group = (_e) } |
1c2545be TY |
3745 | #define G(_f, _g) { .flags = ((_f) | Group | ModRM), .u.group = (_g) } |
3746 | #define GD(_f, _g) { .flags = ((_f) | GroupDual | ModRM), .u.gdual = (_g) } | |
39f062ff | 3747 | #define ID(_f, _i) { .flags = ((_f) | InstrDual | ModRM), .u.idual = (_i) } |
2276b511 | 3748 | #define MD(_f, _m) { .flags = ((_f) | ModeDual), .u.mdual = (_m) } |
045a282c | 3749 | #define E(_f, _e) { .flags = ((_f) | Escape | ModRM), .u.esc = (_e) } |
73fba5f4 | 3750 | #define I(_f, _e) { .flags = (_f), .u.execute = (_e) } |
e28bbd44 | 3751 | #define F(_f, _e) { .flags = (_f) | Fastop, .u.fastop = (_e) } |
c4f035c6 | 3752 | #define II(_f, _e, _i) \ |
d40a6898 | 3753 | { .flags = (_f)|Intercept, .u.execute = (_e), .intercept = x86_intercept_##_i } |
d09beabd | 3754 | #define IIP(_f, _e, _i, _p) \ |
d40a6898 PB |
3755 | { .flags = (_f)|Intercept|CheckPerm, .u.execute = (_e), \ |
3756 | .intercept = x86_intercept_##_i, .check_perm = (_p) } | |
aa97bb48 | 3757 | #define GP(_f, _g) { .flags = ((_f) | Prefix), .u.gprefix = (_g) } |
73fba5f4 | 3758 | |
8d8f4e9f | 3759 | #define D2bv(_f) D((_f) | ByteOp), D(_f) |
f6511935 | 3760 | #define D2bvIP(_f, _i, _p) DIP((_f) | ByteOp, _i, _p), DIP(_f, _i, _p) |
8d8f4e9f | 3761 | #define I2bv(_f, _e) I((_f) | ByteOp, _e), I(_f, _e) |
f7857f35 | 3762 | #define F2bv(_f, _e) F((_f) | ByteOp, _e), F(_f, _e) |
d7841a4b TY |
3763 | #define I2bvIP(_f, _e, _i, _p) \ |
3764 | IIP((_f) | ByteOp, _e, _i, _p), IIP(_f, _e, _i, _p) | |
8d8f4e9f | 3765 | |
fb864fbc AK |
3766 | #define F6ALU(_f, _e) F2bv((_f) | DstMem | SrcReg | ModRM, _e), \ |
3767 | F2bv(((_f) | DstReg | SrcMem | ModRM) & ~Lock, _e), \ | |
3768 | F2bv(((_f) & ~Lock) | DstAcc | SrcImm, _e) | |
6230f7fc | 3769 | |
0f54a321 NA |
3770 | static const struct opcode group7_rm0[] = { |
3771 | N, | |
3772 | I(SrcNone | Priv | EmulateOnUD, em_vmcall), | |
3773 | N, N, N, N, N, N, | |
3774 | }; | |
3775 | ||
fd0a0d82 | 3776 | static const struct opcode group7_rm1[] = { |
1c2545be TY |
3777 | DI(SrcNone | Priv, monitor), |
3778 | DI(SrcNone | Priv, mwait), | |
d7eb8203 JR |
3779 | N, N, N, N, N, N, |
3780 | }; | |
3781 | ||
fd0a0d82 | 3782 | static const struct opcode group7_rm3[] = { |
1c2545be | 3783 | DIP(SrcNone | Prot | Priv, vmrun, check_svme_pa), |
b51e974f | 3784 | II(SrcNone | Prot | EmulateOnUD, em_vmmcall, vmmcall), |
1c2545be TY |
3785 | DIP(SrcNone | Prot | Priv, vmload, check_svme_pa), |
3786 | DIP(SrcNone | Prot | Priv, vmsave, check_svme_pa), | |
3787 | DIP(SrcNone | Prot | Priv, stgi, check_svme), | |
3788 | DIP(SrcNone | Prot | Priv, clgi, check_svme), | |
3789 | DIP(SrcNone | Prot | Priv, skinit, check_svme), | |
3790 | DIP(SrcNone | Prot | Priv, invlpga, check_svme), | |
01de8b09 | 3791 | }; |
6230f7fc | 3792 | |
fd0a0d82 | 3793 | static const struct opcode group7_rm7[] = { |
d7eb8203 | 3794 | N, |
1c2545be | 3795 | DIP(SrcNone, rdtscp, check_rdtsc), |
d7eb8203 JR |
3796 | N, N, N, N, N, N, |
3797 | }; | |
d67fc27a | 3798 | |
fd0a0d82 | 3799 | static const struct opcode group1[] = { |
fb864fbc AK |
3800 | F(Lock, em_add), |
3801 | F(Lock | PageTable, em_or), | |
3802 | F(Lock, em_adc), | |
3803 | F(Lock, em_sbb), | |
3804 | F(Lock | PageTable, em_and), | |
3805 | F(Lock, em_sub), | |
3806 | F(Lock, em_xor), | |
3807 | F(NoWrite, em_cmp), | |
73fba5f4 AK |
3808 | }; |
3809 | ||
fd0a0d82 | 3810 | static const struct opcode group1A[] = { |
ab708099 | 3811 | I(DstMem | SrcNone | Mov | Stack | IncSP, em_pop), N, N, N, N, N, N, N, |
73fba5f4 AK |
3812 | }; |
3813 | ||
007a3b54 AK |
3814 | static const struct opcode group2[] = { |
3815 | F(DstMem | ModRM, em_rol), | |
3816 | F(DstMem | ModRM, em_ror), | |
3817 | F(DstMem | ModRM, em_rcl), | |
3818 | F(DstMem | ModRM, em_rcr), | |
3819 | F(DstMem | ModRM, em_shl), | |
3820 | F(DstMem | ModRM, em_shr), | |
3821 | F(DstMem | ModRM, em_shl), | |
3822 | F(DstMem | ModRM, em_sar), | |
3823 | }; | |
3824 | ||
fd0a0d82 | 3825 | static const struct opcode group3[] = { |
fb864fbc AK |
3826 | F(DstMem | SrcImm | NoWrite, em_test), |
3827 | F(DstMem | SrcImm | NoWrite, em_test), | |
45a1467d AK |
3828 | F(DstMem | SrcNone | Lock, em_not), |
3829 | F(DstMem | SrcNone | Lock, em_neg), | |
b9fa409b AK |
3830 | F(DstXacc | Src2Mem, em_mul_ex), |
3831 | F(DstXacc | Src2Mem, em_imul_ex), | |
b8c0b6ae AK |
3832 | F(DstXacc | Src2Mem, em_div_ex), |
3833 | F(DstXacc | Src2Mem, em_idiv_ex), | |
73fba5f4 AK |
3834 | }; |
3835 | ||
fd0a0d82 | 3836 | static const struct opcode group4[] = { |
95413dc4 AK |
3837 | F(ByteOp | DstMem | SrcNone | Lock, em_inc), |
3838 | F(ByteOp | DstMem | SrcNone | Lock, em_dec), | |
73fba5f4 AK |
3839 | N, N, N, N, N, N, |
3840 | }; | |
3841 | ||
fd0a0d82 | 3842 | static const struct opcode group5[] = { |
95413dc4 AK |
3843 | F(DstMem | SrcNone | Lock, em_inc), |
3844 | F(DstMem | SrcNone | Lock, em_dec), | |
58b7075d | 3845 | I(SrcMem | NearBranch, em_call_near_abs), |
1c2545be | 3846 | I(SrcMemFAddr | ImplicitOps | Stack, em_call_far), |
58b7075d | 3847 | I(SrcMem | NearBranch, em_jmp_abs), |
f7784046 NA |
3848 | I(SrcMemFAddr | ImplicitOps, em_jmp_far), |
3849 | I(SrcMem | Stack, em_push), D(Undefined), | |
73fba5f4 AK |
3850 | }; |
3851 | ||
fd0a0d82 | 3852 | static const struct opcode group6[] = { |
63ea0a49 NA |
3853 | DI(Prot | DstMem, sldt), |
3854 | DI(Prot | DstMem, str), | |
a14e579f | 3855 | II(Prot | Priv | SrcMem16, em_lldt, lldt), |
80890006 | 3856 | II(Prot | Priv | SrcMem16, em_ltr, ltr), |
dee6bb70 JR |
3857 | N, N, N, N, |
3858 | }; | |
3859 | ||
fd0a0d82 | 3860 | static const struct group_dual group7 = { { |
606b1c3e NA |
3861 | II(Mov | DstMem, em_sgdt, sgdt), |
3862 | II(Mov | DstMem, em_sidt, sidt), | |
1c2545be TY |
3863 | II(SrcMem | Priv, em_lgdt, lgdt), |
3864 | II(SrcMem | Priv, em_lidt, lidt), | |
3865 | II(SrcNone | DstMem | Mov, em_smsw, smsw), N, | |
3866 | II(SrcMem16 | Mov | Priv, em_lmsw, lmsw), | |
3867 | II(SrcMem | ByteOp | Priv | NoAccess, em_invlpg, invlpg), | |
73fba5f4 | 3868 | }, { |
0f54a321 | 3869 | EXT(0, group7_rm0), |
5ef39c71 | 3870 | EXT(0, group7_rm1), |
01de8b09 | 3871 | N, EXT(0, group7_rm3), |
1c2545be TY |
3872 | II(SrcNone | DstMem | Mov, em_smsw, smsw), N, |
3873 | II(SrcMem16 | Mov | Priv, em_lmsw, lmsw), | |
3874 | EXT(0, group7_rm7), | |
73fba5f4 AK |
3875 | } }; |
3876 | ||
fd0a0d82 | 3877 | static const struct opcode group8[] = { |
73fba5f4 | 3878 | N, N, N, N, |
11c363ba AK |
3879 | F(DstMem | SrcImmByte | NoWrite, em_bt), |
3880 | F(DstMem | SrcImmByte | Lock | PageTable, em_bts), | |
3881 | F(DstMem | SrcImmByte | Lock, em_btr), | |
3882 | F(DstMem | SrcImmByte | Lock | PageTable, em_btc), | |
73fba5f4 AK |
3883 | }; |
3884 | ||
fd0a0d82 | 3885 | static const struct group_dual group9 = { { |
1c2545be | 3886 | N, I(DstMem64 | Lock | PageTable, em_cmpxchg8b), N, N, N, N, N, N, |
73fba5f4 AK |
3887 | }, { |
3888 | N, N, N, N, N, N, N, N, | |
3889 | } }; | |
3890 | ||
fd0a0d82 | 3891 | static const struct opcode group11[] = { |
1c2545be | 3892 | I(DstMem | SrcImm | Mov | PageTable, em_mov), |
d5ae7ce8 | 3893 | X7(D(Undefined)), |
a4d4a7c1 AK |
3894 | }; |
3895 | ||
13e457e0 | 3896 | static const struct gprefix pfx_0f_ae_7 = { |
3f6f1480 | 3897 | I(SrcMem | ByteOp, em_clflush), N, N, N, |
13e457e0 NA |
3898 | }; |
3899 | ||
3900 | static const struct group_dual group15 = { { | |
3901 | N, N, N, N, N, N, N, GP(0, &pfx_0f_ae_7), | |
3902 | }, { | |
3903 | N, N, N, N, N, N, N, N, | |
3904 | } }; | |
3905 | ||
fd0a0d82 | 3906 | static const struct gprefix pfx_0f_6f_0f_7f = { |
e5971755 | 3907 | I(Mmx, em_mov), I(Sse | Aligned, em_mov), N, I(Sse | Unaligned, em_mov), |
aa97bb48 AK |
3908 | }; |
3909 | ||
39f062ff NA |
3910 | static const struct instr_dual instr_dual_0f_2b = { |
3911 | I(0, em_mov), N | |
3912 | }; | |
3913 | ||
d5b77069 | 3914 | static const struct gprefix pfx_0f_2b = { |
39f062ff | 3915 | ID(0, &instr_dual_0f_2b), ID(0, &instr_dual_0f_2b), N, N, |
3e114eb4 AK |
3916 | }; |
3917 | ||
27ce8258 | 3918 | static const struct gprefix pfx_0f_28_0f_29 = { |
6fec27d8 | 3919 | I(Aligned, em_mov), I(Aligned, em_mov), N, N, |
27ce8258 IM |
3920 | }; |
3921 | ||
0a37027e AW |
3922 | static const struct gprefix pfx_0f_e7 = { |
3923 | N, I(Sse, em_mov), N, N, | |
3924 | }; | |
3925 | ||
045a282c | 3926 | static const struct escape escape_d9 = { { |
16bebefe | 3927 | N, N, N, N, N, N, N, I(DstMem16 | Mov, em_fnstcw), |
045a282c GN |
3928 | }, { |
3929 | /* 0xC0 - 0xC7 */ | |
3930 | N, N, N, N, N, N, N, N, | |
3931 | /* 0xC8 - 0xCF */ | |
3932 | N, N, N, N, N, N, N, N, | |
3933 | /* 0xD0 - 0xC7 */ | |
3934 | N, N, N, N, N, N, N, N, | |
3935 | /* 0xD8 - 0xDF */ | |
3936 | N, N, N, N, N, N, N, N, | |
3937 | /* 0xE0 - 0xE7 */ | |
3938 | N, N, N, N, N, N, N, N, | |
3939 | /* 0xE8 - 0xEF */ | |
3940 | N, N, N, N, N, N, N, N, | |
3941 | /* 0xF0 - 0xF7 */ | |
3942 | N, N, N, N, N, N, N, N, | |
3943 | /* 0xF8 - 0xFF */ | |
3944 | N, N, N, N, N, N, N, N, | |
3945 | } }; | |
3946 | ||
3947 | static const struct escape escape_db = { { | |
3948 | N, N, N, N, N, N, N, N, | |
3949 | }, { | |
3950 | /* 0xC0 - 0xC7 */ | |
3951 | N, N, N, N, N, N, N, N, | |
3952 | /* 0xC8 - 0xCF */ | |
3953 | N, N, N, N, N, N, N, N, | |
3954 | /* 0xD0 - 0xC7 */ | |
3955 | N, N, N, N, N, N, N, N, | |
3956 | /* 0xD8 - 0xDF */ | |
3957 | N, N, N, N, N, N, N, N, | |
3958 | /* 0xE0 - 0xE7 */ | |
3959 | N, N, N, I(ImplicitOps, em_fninit), N, N, N, N, | |
3960 | /* 0xE8 - 0xEF */ | |
3961 | N, N, N, N, N, N, N, N, | |
3962 | /* 0xF0 - 0xF7 */ | |
3963 | N, N, N, N, N, N, N, N, | |
3964 | /* 0xF8 - 0xFF */ | |
3965 | N, N, N, N, N, N, N, N, | |
3966 | } }; | |
3967 | ||
3968 | static const struct escape escape_dd = { { | |
16bebefe | 3969 | N, N, N, N, N, N, N, I(DstMem16 | Mov, em_fnstsw), |
045a282c GN |
3970 | }, { |
3971 | /* 0xC0 - 0xC7 */ | |
3972 | N, N, N, N, N, N, N, N, | |
3973 | /* 0xC8 - 0xCF */ | |
3974 | N, N, N, N, N, N, N, N, | |
3975 | /* 0xD0 - 0xC7 */ | |
3976 | N, N, N, N, N, N, N, N, | |
3977 | /* 0xD8 - 0xDF */ | |
3978 | N, N, N, N, N, N, N, N, | |
3979 | /* 0xE0 - 0xE7 */ | |
3980 | N, N, N, N, N, N, N, N, | |
3981 | /* 0xE8 - 0xEF */ | |
3982 | N, N, N, N, N, N, N, N, | |
3983 | /* 0xF0 - 0xF7 */ | |
3984 | N, N, N, N, N, N, N, N, | |
3985 | /* 0xF8 - 0xFF */ | |
3986 | N, N, N, N, N, N, N, N, | |
3987 | } }; | |
3988 | ||
39f062ff NA |
3989 | static const struct instr_dual instr_dual_0f_c3 = { |
3990 | I(DstMem | SrcReg | ModRM | No16 | Mov, em_mov), N | |
3991 | }; | |
3992 | ||
2276b511 NA |
3993 | static const struct mode_dual mode_dual_63 = { |
3994 | N, I(DstReg | SrcMem32 | ModRM | Mov, em_movsxd) | |
3995 | }; | |
3996 | ||
fd0a0d82 | 3997 | static const struct opcode opcode_table[256] = { |
73fba5f4 | 3998 | /* 0x00 - 0x07 */ |
fb864fbc | 3999 | F6ALU(Lock, em_add), |
1cd196ea AK |
4000 | I(ImplicitOps | Stack | No64 | Src2ES, em_push_sreg), |
4001 | I(ImplicitOps | Stack | No64 | Src2ES, em_pop_sreg), | |
73fba5f4 | 4002 | /* 0x08 - 0x0F */ |
fb864fbc | 4003 | F6ALU(Lock | PageTable, em_or), |
1cd196ea AK |
4004 | I(ImplicitOps | Stack | No64 | Src2CS, em_push_sreg), |
4005 | N, | |
73fba5f4 | 4006 | /* 0x10 - 0x17 */ |
fb864fbc | 4007 | F6ALU(Lock, em_adc), |
1cd196ea AK |
4008 | I(ImplicitOps | Stack | No64 | Src2SS, em_push_sreg), |
4009 | I(ImplicitOps | Stack | No64 | Src2SS, em_pop_sreg), | |
73fba5f4 | 4010 | /* 0x18 - 0x1F */ |
fb864fbc | 4011 | F6ALU(Lock, em_sbb), |
1cd196ea AK |
4012 | I(ImplicitOps | Stack | No64 | Src2DS, em_push_sreg), |
4013 | I(ImplicitOps | Stack | No64 | Src2DS, em_pop_sreg), | |
73fba5f4 | 4014 | /* 0x20 - 0x27 */ |
fb864fbc | 4015 | F6ALU(Lock | PageTable, em_and), N, N, |
73fba5f4 | 4016 | /* 0x28 - 0x2F */ |
fb864fbc | 4017 | F6ALU(Lock, em_sub), N, I(ByteOp | DstAcc | No64, em_das), |
73fba5f4 | 4018 | /* 0x30 - 0x37 */ |
fb864fbc | 4019 | F6ALU(Lock, em_xor), N, N, |
73fba5f4 | 4020 | /* 0x38 - 0x3F */ |
fb864fbc | 4021 | F6ALU(NoWrite, em_cmp), N, N, |
73fba5f4 | 4022 | /* 0x40 - 0x4F */ |
95413dc4 | 4023 | X8(F(DstReg, em_inc)), X8(F(DstReg, em_dec)), |
73fba5f4 | 4024 | /* 0x50 - 0x57 */ |
63540382 | 4025 | X8(I(SrcReg | Stack, em_push)), |
73fba5f4 | 4026 | /* 0x58 - 0x5F */ |
c54fe504 | 4027 | X8(I(DstReg | Stack, em_pop)), |
73fba5f4 | 4028 | /* 0x60 - 0x67 */ |
b96a7fad TY |
4029 | I(ImplicitOps | Stack | No64, em_pusha), |
4030 | I(ImplicitOps | Stack | No64, em_popa), | |
2276b511 | 4031 | N, MD(ModRM, &mode_dual_63), |
73fba5f4 AK |
4032 | N, N, N, N, |
4033 | /* 0x68 - 0x6F */ | |
d46164db AK |
4034 | I(SrcImm | Mov | Stack, em_push), |
4035 | I(DstReg | SrcMem | ModRM | Src2Imm, em_imul_3op), | |
f3a1b9f4 AK |
4036 | I(SrcImmByte | Mov | Stack, em_push), |
4037 | I(DstReg | SrcMem | ModRM | Src2ImmByte, em_imul_3op), | |
b3356bf0 | 4038 | I2bvIP(DstDI | SrcDX | Mov | String | Unaligned, em_in, ins, check_perm_in), /* insb, insw/insd */ |
2b5e97e1 | 4039 | I2bvIP(SrcSI | DstDX | String, em_out, outs, check_perm_out), /* outsb, outsw/outsd */ |
73fba5f4 | 4040 | /* 0x70 - 0x7F */ |
58b7075d | 4041 | X16(D(SrcImmByte | NearBranch)), |
73fba5f4 | 4042 | /* 0x80 - 0x87 */ |
1c2545be TY |
4043 | G(ByteOp | DstMem | SrcImm, group1), |
4044 | G(DstMem | SrcImm, group1), | |
4045 | G(ByteOp | DstMem | SrcImm | No64, group1), | |
4046 | G(DstMem | SrcImmByte, group1), | |
fb864fbc | 4047 | F2bv(DstMem | SrcReg | ModRM | NoWrite, em_test), |
d5ae7ce8 | 4048 | I2bv(DstMem | SrcReg | ModRM | Lock | PageTable, em_xchg), |
73fba5f4 | 4049 | /* 0x88 - 0x8F */ |
d5ae7ce8 | 4050 | I2bv(DstMem | SrcReg | ModRM | Mov | PageTable, em_mov), |
b9eac5f4 | 4051 | I2bv(DstReg | SrcMem | ModRM | Mov, em_mov), |
d5ae7ce8 | 4052 | I(DstMem | SrcNone | ModRM | Mov | PageTable, em_mov_rm_sreg), |
1bd5f469 TY |
4053 | D(ModRM | SrcMem | NoAccess | DstReg), |
4054 | I(ImplicitOps | SrcMem16 | ModRM, em_mov_sreg_rm), | |
4055 | G(0, group1A), | |
73fba5f4 | 4056 | /* 0x90 - 0x97 */ |
bf608f88 | 4057 | DI(SrcAcc | DstReg, pause), X7(D(SrcAcc | DstReg)), |
73fba5f4 | 4058 | /* 0x98 - 0x9F */ |
61429142 | 4059 | D(DstAcc | SrcNone), I(ImplicitOps | SrcAcc, em_cwd), |
cc4feed5 | 4060 | I(SrcImmFAddr | No64, em_call_far), N, |
62aaa2f0 | 4061 | II(ImplicitOps | Stack, em_pushf, pushf), |
98f73630 PB |
4062 | II(ImplicitOps | Stack, em_popf, popf), |
4063 | I(ImplicitOps, em_sahf), I(ImplicitOps, em_lahf), | |
73fba5f4 | 4064 | /* 0xA0 - 0xA7 */ |
b9eac5f4 | 4065 | I2bv(DstAcc | SrcMem | Mov | MemAbs, em_mov), |
d5ae7ce8 | 4066 | I2bv(DstMem | SrcAcc | Mov | MemAbs | PageTable, em_mov), |
b9eac5f4 | 4067 | I2bv(SrcSI | DstDI | Mov | String, em_mov), |
5aca3722 | 4068 | F2bv(SrcSI | DstDI | String | NoWrite, em_cmp_r), |
73fba5f4 | 4069 | /* 0xA8 - 0xAF */ |
fb864fbc | 4070 | F2bv(DstAcc | SrcImm | NoWrite, em_test), |
b9eac5f4 AK |
4071 | I2bv(SrcAcc | DstDI | Mov | String, em_mov), |
4072 | I2bv(SrcSI | DstAcc | Mov | String, em_mov), | |
5aca3722 | 4073 | F2bv(SrcAcc | DstDI | String | NoWrite, em_cmp_r), |
73fba5f4 | 4074 | /* 0xB0 - 0xB7 */ |
b9eac5f4 | 4075 | X8(I(ByteOp | DstReg | SrcImm | Mov, em_mov)), |
73fba5f4 | 4076 | /* 0xB8 - 0xBF */ |
5e2c6883 | 4077 | X8(I(DstReg | SrcImm64 | Mov, em_mov)), |
73fba5f4 | 4078 | /* 0xC0 - 0xC7 */ |
007a3b54 | 4079 | G(ByteOp | Src2ImmByte, group2), G(Src2ImmByte, group2), |
58b7075d NA |
4080 | I(ImplicitOps | NearBranch | SrcImmU16, em_ret_near_imm), |
4081 | I(ImplicitOps | NearBranch, em_ret), | |
d4b4325f AK |
4082 | I(DstReg | SrcMemFAddr | ModRM | No64 | Src2ES, em_lseg), |
4083 | I(DstReg | SrcMemFAddr | ModRM | No64 | Src2DS, em_lseg), | |
a4d4a7c1 | 4084 | G(ByteOp, group11), G(0, group11), |
73fba5f4 | 4085 | /* 0xC8 - 0xCF */ |
612e89f0 | 4086 | I(Stack | SrcImmU16 | Src2ImmByte, em_enter), I(Stack, em_leave), |
16794aaa NA |
4087 | I(ImplicitOps | SrcImmU16, em_ret_far_imm), |
4088 | I(ImplicitOps, em_ret_far), | |
3c6e276f | 4089 | D(ImplicitOps), DI(SrcImmByte, intn), |
db5b0762 | 4090 | D(ImplicitOps | No64), II(ImplicitOps, em_iret, iret), |
73fba5f4 | 4091 | /* 0xD0 - 0xD7 */ |
007a3b54 AK |
4092 | G(Src2One | ByteOp, group2), G(Src2One, group2), |
4093 | G(Src2CL | ByteOp, group2), G(Src2CL, group2), | |
a035d5c6 | 4094 | I(DstAcc | SrcImmUByte | No64, em_aam), |
326f578f PB |
4095 | I(DstAcc | SrcImmUByte | No64, em_aad), |
4096 | F(DstAcc | ByteOp | No64, em_salc), | |
7fa57952 | 4097 | I(DstAcc | SrcXLat | ByteOp, em_mov), |
73fba5f4 | 4098 | /* 0xD8 - 0xDF */ |
045a282c | 4099 | N, E(0, &escape_d9), N, E(0, &escape_db), N, E(0, &escape_dd), N, N, |
73fba5f4 | 4100 | /* 0xE0 - 0xE7 */ |
58b7075d NA |
4101 | X3(I(SrcImmByte | NearBranch, em_loop)), |
4102 | I(SrcImmByte | NearBranch, em_jcxz), | |
d7841a4b TY |
4103 | I2bvIP(SrcImmUByte | DstAcc, em_in, in, check_perm_in), |
4104 | I2bvIP(SrcAcc | DstImmUByte, em_out, out, check_perm_out), | |
73fba5f4 | 4105 | /* 0xE8 - 0xEF */ |
58b7075d NA |
4106 | I(SrcImm | NearBranch, em_call), D(SrcImm | ImplicitOps | NearBranch), |
4107 | I(SrcImmFAddr | No64, em_jmp_far), | |
4108 | D(SrcImmByte | ImplicitOps | NearBranch), | |
d7841a4b TY |
4109 | I2bvIP(SrcDX | DstAcc, em_in, in, check_perm_in), |
4110 | I2bvIP(SrcAcc | DstDX, em_out, out, check_perm_out), | |
73fba5f4 | 4111 | /* 0xF0 - 0xF7 */ |
bf608f88 | 4112 | N, DI(ImplicitOps, icebp), N, N, |
3c6e276f AK |
4113 | DI(ImplicitOps | Priv, hlt), D(ImplicitOps), |
4114 | G(ByteOp, group3), G(0, group3), | |
73fba5f4 | 4115 | /* 0xF8 - 0xFF */ |
f411e6cd TY |
4116 | D(ImplicitOps), D(ImplicitOps), |
4117 | I(ImplicitOps, em_cli), I(ImplicitOps, em_sti), | |
73fba5f4 AK |
4118 | D(ImplicitOps), D(ImplicitOps), G(0, group4), G(0, group5), |
4119 | }; | |
4120 | ||
fd0a0d82 | 4121 | static const struct opcode twobyte_table[256] = { |
73fba5f4 | 4122 | /* 0x00 - 0x0F */ |
dee6bb70 | 4123 | G(0, group6), GD(0, &group7), N, N, |
b51e974f | 4124 | N, I(ImplicitOps | EmulateOnUD, em_syscall), |
db5b0762 | 4125 | II(ImplicitOps | Priv, em_clts, clts), N, |
3c6e276f | 4126 | DI(ImplicitOps | Priv, invd), DI(ImplicitOps | Priv, wbinvd), N, N, |
3f6f1480 | 4127 | N, D(ImplicitOps | ModRM | SrcMem | NoAccess), N, N, |
73fba5f4 | 4128 | /* 0x10 - 0x1F */ |
103f98ea | 4129 | N, N, N, N, N, N, N, N, |
3f6f1480 NA |
4130 | D(ImplicitOps | ModRM | SrcMem | NoAccess), |
4131 | N, N, N, N, N, N, D(ImplicitOps | ModRM | SrcMem | NoAccess), | |
73fba5f4 | 4132 | /* 0x20 - 0x2F */ |
9b88ae99 NA |
4133 | DIP(ModRM | DstMem | Priv | Op3264 | NoMod, cr_read, check_cr_read), |
4134 | DIP(ModRM | DstMem | Priv | Op3264 | NoMod, dr_read, check_dr_read), | |
4135 | IIP(ModRM | SrcMem | Priv | Op3264 | NoMod, em_cr_write, cr_write, | |
4136 | check_cr_write), | |
4137 | IIP(ModRM | SrcMem | Priv | Op3264 | NoMod, em_dr_write, dr_write, | |
4138 | check_dr_write), | |
73fba5f4 | 4139 | N, N, N, N, |
27ce8258 IM |
4140 | GP(ModRM | DstReg | SrcMem | Mov | Sse, &pfx_0f_28_0f_29), |
4141 | GP(ModRM | DstMem | SrcReg | Mov | Sse, &pfx_0f_28_0f_29), | |
d5b77069 | 4142 | N, GP(ModRM | DstMem | SrcReg | Mov | Sse, &pfx_0f_2b), |
3e114eb4 | 4143 | N, N, N, N, |
73fba5f4 | 4144 | /* 0x30 - 0x3F */ |
e1e210b0 | 4145 | II(ImplicitOps | Priv, em_wrmsr, wrmsr), |
8061252e | 4146 | IIP(ImplicitOps, em_rdtsc, rdtsc, check_rdtsc), |
e1e210b0 | 4147 | II(ImplicitOps | Priv, em_rdmsr, rdmsr), |
222d21aa | 4148 | IIP(ImplicitOps, em_rdpmc, rdpmc, check_rdpmc), |
b51e974f BP |
4149 | I(ImplicitOps | EmulateOnUD, em_sysenter), |
4150 | I(ImplicitOps | Priv | EmulateOnUD, em_sysexit), | |
d867162c | 4151 | N, N, |
73fba5f4 AK |
4152 | N, N, N, N, N, N, N, N, |
4153 | /* 0x40 - 0x4F */ | |
140bad89 | 4154 | X16(D(DstReg | SrcMem | ModRM)), |
73fba5f4 AK |
4155 | /* 0x50 - 0x5F */ |
4156 | N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, | |
4157 | /* 0x60 - 0x6F */ | |
aa97bb48 AK |
4158 | N, N, N, N, |
4159 | N, N, N, N, | |
4160 | N, N, N, N, | |
4161 | N, N, N, GP(SrcMem | DstReg | ModRM | Mov, &pfx_0f_6f_0f_7f), | |
73fba5f4 | 4162 | /* 0x70 - 0x7F */ |
aa97bb48 AK |
4163 | N, N, N, N, |
4164 | N, N, N, N, | |
4165 | N, N, N, N, | |
4166 | N, N, N, GP(SrcReg | DstMem | ModRM | Mov, &pfx_0f_6f_0f_7f), | |
73fba5f4 | 4167 | /* 0x80 - 0x8F */ |
58b7075d | 4168 | X16(D(SrcImm | NearBranch)), |
73fba5f4 | 4169 | /* 0x90 - 0x9F */ |
ee45b58e | 4170 | X16(D(ByteOp | DstMem | SrcNone | ModRM| Mov)), |
73fba5f4 | 4171 | /* 0xA0 - 0xA7 */ |
1cd196ea | 4172 | I(Stack | Src2FS, em_push_sreg), I(Stack | Src2FS, em_pop_sreg), |
11c363ba AK |
4173 | II(ImplicitOps, em_cpuid, cpuid), |
4174 | F(DstMem | SrcReg | ModRM | BitOp | NoWrite, em_bt), | |
0bdea068 AK |
4175 | F(DstMem | SrcReg | Src2ImmByte | ModRM, em_shld), |
4176 | F(DstMem | SrcReg | Src2CL | ModRM, em_shld), N, N, | |
73fba5f4 | 4177 | /* 0xA8 - 0xAF */ |
1cd196ea | 4178 | I(Stack | Src2GS, em_push_sreg), I(Stack | Src2GS, em_pop_sreg), |
d5ae7ce8 | 4179 | DI(ImplicitOps, rsm), |
11c363ba | 4180 | F(DstMem | SrcReg | ModRM | BitOp | Lock | PageTable, em_bts), |
0bdea068 AK |
4181 | F(DstMem | SrcReg | Src2ImmByte | ModRM, em_shrd), |
4182 | F(DstMem | SrcReg | Src2CL | ModRM, em_shrd), | |
13e457e0 | 4183 | GD(0, &group15), F(DstReg | SrcMem | ModRM, em_imul), |
73fba5f4 | 4184 | /* 0xB0 - 0xB7 */ |
2fcf5c8a | 4185 | I2bv(DstMem | SrcReg | ModRM | Lock | PageTable | SrcWrite, em_cmpxchg), |
d4b4325f | 4186 | I(DstReg | SrcMemFAddr | ModRM | Src2SS, em_lseg), |
11c363ba | 4187 | F(DstMem | SrcReg | ModRM | BitOp | Lock, em_btr), |
d4b4325f AK |
4188 | I(DstReg | SrcMemFAddr | ModRM | Src2FS, em_lseg), |
4189 | I(DstReg | SrcMemFAddr | ModRM | Src2GS, em_lseg), | |
2adb5ad9 | 4190 | D(DstReg | SrcMem8 | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov), |
73fba5f4 AK |
4191 | /* 0xB8 - 0xBF */ |
4192 | N, N, | |
ce7faab2 | 4193 | G(BitOp, group8), |
11c363ba AK |
4194 | F(DstMem | SrcReg | ModRM | BitOp | Lock | PageTable, em_btc), |
4195 | F(DstReg | SrcMem | ModRM, em_bsf), F(DstReg | SrcMem | ModRM, em_bsr), | |
2adb5ad9 | 4196 | D(DstReg | SrcMem8 | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov), |
9299836e | 4197 | /* 0xC0 - 0xC7 */ |
e47a5f5f | 4198 | F2bv(DstMem | SrcReg | ModRM | SrcWrite | Lock, em_xadd), |
39f062ff | 4199 | N, ID(0, &instr_dual_0f_c3), |
73fba5f4 | 4200 | N, N, N, GD(0, &group9), |
9299836e AK |
4201 | /* 0xC8 - 0xCF */ |
4202 | X8(I(DstReg, em_bswap)), | |
73fba5f4 AK |
4203 | /* 0xD0 - 0xDF */ |
4204 | N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, | |
4205 | /* 0xE0 - 0xEF */ | |
0a37027e AW |
4206 | N, N, N, N, N, N, N, GP(SrcReg | DstMem | ModRM | Mov, &pfx_0f_e7), |
4207 | N, N, N, N, N, N, N, N, | |
73fba5f4 AK |
4208 | /* 0xF0 - 0xFF */ |
4209 | N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N | |
4210 | }; | |
4211 | ||
39f062ff NA |
4212 | static const struct instr_dual instr_dual_0f_38_f0 = { |
4213 | I(DstReg | SrcMem | Mov, em_movbe), N | |
4214 | }; | |
4215 | ||
4216 | static const struct instr_dual instr_dual_0f_38_f1 = { | |
4217 | I(DstMem | SrcReg | Mov, em_movbe), N | |
4218 | }; | |
4219 | ||
0bc5eedb | 4220 | static const struct gprefix three_byte_0f_38_f0 = { |
39f062ff | 4221 | ID(0, &instr_dual_0f_38_f0), N, N, N |
0bc5eedb BP |
4222 | }; |
4223 | ||
4224 | static const struct gprefix three_byte_0f_38_f1 = { | |
39f062ff | 4225 | ID(0, &instr_dual_0f_38_f1), N, N, N |
0bc5eedb BP |
4226 | }; |
4227 | ||
4228 | /* | |
4229 | * Insns below are selected by the prefix which indexed by the third opcode | |
4230 | * byte. | |
4231 | */ | |
4232 | static const struct opcode opcode_map_0f_38[256] = { | |
4233 | /* 0x00 - 0x7f */ | |
4234 | X16(N), X16(N), X16(N), X16(N), X16(N), X16(N), X16(N), X16(N), | |
84cffe49 BP |
4235 | /* 0x80 - 0xef */ |
4236 | X16(N), X16(N), X16(N), X16(N), X16(N), X16(N), X16(N), | |
4237 | /* 0xf0 - 0xf1 */ | |
53bb4f78 NA |
4238 | GP(EmulateOnUD | ModRM, &three_byte_0f_38_f0), |
4239 | GP(EmulateOnUD | ModRM, &three_byte_0f_38_f1), | |
84cffe49 BP |
4240 | /* 0xf2 - 0xff */ |
4241 | N, N, X4(N), X8(N) | |
0bc5eedb BP |
4242 | }; |
4243 | ||
73fba5f4 AK |
4244 | #undef D |
4245 | #undef N | |
4246 | #undef G | |
4247 | #undef GD | |
4248 | #undef I | |
aa97bb48 | 4249 | #undef GP |
01de8b09 | 4250 | #undef EXT |
2276b511 | 4251 | #undef MD |
2b42fce6 | 4252 | #undef ID |
73fba5f4 | 4253 | |
8d8f4e9f | 4254 | #undef D2bv |
f6511935 | 4255 | #undef D2bvIP |
8d8f4e9f | 4256 | #undef I2bv |
d7841a4b | 4257 | #undef I2bvIP |
d67fc27a | 4258 | #undef I6ALU |
8d8f4e9f | 4259 | |
9dac77fa | 4260 | static unsigned imm_size(struct x86_emulate_ctxt *ctxt) |
39f21ee5 AK |
4261 | { |
4262 | unsigned size; | |
4263 | ||
9dac77fa | 4264 | size = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; |
39f21ee5 AK |
4265 | if (size == 8) |
4266 | size = 4; | |
4267 | return size; | |
4268 | } | |
4269 | ||
4270 | static int decode_imm(struct x86_emulate_ctxt *ctxt, struct operand *op, | |
4271 | unsigned size, bool sign_extension) | |
4272 | { | |
39f21ee5 AK |
4273 | int rc = X86EMUL_CONTINUE; |
4274 | ||
4275 | op->type = OP_IMM; | |
4276 | op->bytes = size; | |
9dac77fa | 4277 | op->addr.mem.ea = ctxt->_eip; |
39f21ee5 AK |
4278 | /* NB. Immediates are sign-extended as necessary. */ |
4279 | switch (op->bytes) { | |
4280 | case 1: | |
e85a1085 | 4281 | op->val = insn_fetch(s8, ctxt); |
39f21ee5 AK |
4282 | break; |
4283 | case 2: | |
e85a1085 | 4284 | op->val = insn_fetch(s16, ctxt); |
39f21ee5 AK |
4285 | break; |
4286 | case 4: | |
e85a1085 | 4287 | op->val = insn_fetch(s32, ctxt); |
39f21ee5 | 4288 | break; |
5e2c6883 NA |
4289 | case 8: |
4290 | op->val = insn_fetch(s64, ctxt); | |
4291 | break; | |
39f21ee5 AK |
4292 | } |
4293 | if (!sign_extension) { | |
4294 | switch (op->bytes) { | |
4295 | case 1: | |
4296 | op->val &= 0xff; | |
4297 | break; | |
4298 | case 2: | |
4299 | op->val &= 0xffff; | |
4300 | break; | |
4301 | case 4: | |
4302 | op->val &= 0xffffffff; | |
4303 | break; | |
4304 | } | |
4305 | } | |
4306 | done: | |
4307 | return rc; | |
4308 | } | |
4309 | ||
a9945549 AK |
4310 | static int decode_operand(struct x86_emulate_ctxt *ctxt, struct operand *op, |
4311 | unsigned d) | |
4312 | { | |
4313 | int rc = X86EMUL_CONTINUE; | |
4314 | ||
4315 | switch (d) { | |
4316 | case OpReg: | |
2adb5ad9 | 4317 | decode_register_operand(ctxt, op); |
a9945549 AK |
4318 | break; |
4319 | case OpImmUByte: | |
608aabe3 | 4320 | rc = decode_imm(ctxt, op, 1, false); |
a9945549 AK |
4321 | break; |
4322 | case OpMem: | |
41ddf978 | 4323 | ctxt->memop.bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; |
0fe59128 AK |
4324 | mem_common: |
4325 | *op = ctxt->memop; | |
4326 | ctxt->memopp = op; | |
96888977 | 4327 | if (ctxt->d & BitOp) |
a9945549 AK |
4328 | fetch_bit_operand(ctxt); |
4329 | op->orig_val = op->val; | |
4330 | break; | |
41ddf978 | 4331 | case OpMem64: |
aaa05f24 | 4332 | ctxt->memop.bytes = (ctxt->op_bytes == 8) ? 16 : 8; |
41ddf978 | 4333 | goto mem_common; |
a9945549 AK |
4334 | case OpAcc: |
4335 | op->type = OP_REG; | |
4336 | op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; | |
dd856efa | 4337 | op->addr.reg = reg_rmw(ctxt, VCPU_REGS_RAX); |
a9945549 AK |
4338 | fetch_register_operand(op); |
4339 | op->orig_val = op->val; | |
4340 | break; | |
820207c8 AK |
4341 | case OpAccLo: |
4342 | op->type = OP_REG; | |
4343 | op->bytes = (ctxt->d & ByteOp) ? 2 : ctxt->op_bytes; | |
4344 | op->addr.reg = reg_rmw(ctxt, VCPU_REGS_RAX); | |
4345 | fetch_register_operand(op); | |
4346 | op->orig_val = op->val; | |
4347 | break; | |
4348 | case OpAccHi: | |
4349 | if (ctxt->d & ByteOp) { | |
4350 | op->type = OP_NONE; | |
4351 | break; | |
4352 | } | |
4353 | op->type = OP_REG; | |
4354 | op->bytes = ctxt->op_bytes; | |
4355 | op->addr.reg = reg_rmw(ctxt, VCPU_REGS_RDX); | |
4356 | fetch_register_operand(op); | |
4357 | op->orig_val = op->val; | |
4358 | break; | |
a9945549 AK |
4359 | case OpDI: |
4360 | op->type = OP_MEM; | |
4361 | op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; | |
4362 | op->addr.mem.ea = | |
01485a22 | 4363 | register_address(ctxt, VCPU_REGS_RDI); |
a9945549 AK |
4364 | op->addr.mem.seg = VCPU_SREG_ES; |
4365 | op->val = 0; | |
b3356bf0 | 4366 | op->count = 1; |
a9945549 AK |
4367 | break; |
4368 | case OpDX: | |
4369 | op->type = OP_REG; | |
4370 | op->bytes = 2; | |
dd856efa | 4371 | op->addr.reg = reg_rmw(ctxt, VCPU_REGS_RDX); |
a9945549 AK |
4372 | fetch_register_operand(op); |
4373 | break; | |
4dd6a57d | 4374 | case OpCL: |
d29b9d7e | 4375 | op->type = OP_IMM; |
4dd6a57d | 4376 | op->bytes = 1; |
dd856efa | 4377 | op->val = reg_read(ctxt, VCPU_REGS_RCX) & 0xff; |
4dd6a57d AK |
4378 | break; |
4379 | case OpImmByte: | |
4380 | rc = decode_imm(ctxt, op, 1, true); | |
4381 | break; | |
4382 | case OpOne: | |
d29b9d7e | 4383 | op->type = OP_IMM; |
4dd6a57d AK |
4384 | op->bytes = 1; |
4385 | op->val = 1; | |
4386 | break; | |
4387 | case OpImm: | |
4388 | rc = decode_imm(ctxt, op, imm_size(ctxt), true); | |
4389 | break; | |
5e2c6883 NA |
4390 | case OpImm64: |
4391 | rc = decode_imm(ctxt, op, ctxt->op_bytes, true); | |
4392 | break; | |
28867cee AK |
4393 | case OpMem8: |
4394 | ctxt->memop.bytes = 1; | |
660696d1 | 4395 | if (ctxt->memop.type == OP_REG) { |
aa9ac1a6 GN |
4396 | ctxt->memop.addr.reg = decode_register(ctxt, |
4397 | ctxt->modrm_rm, true); | |
660696d1 GN |
4398 | fetch_register_operand(&ctxt->memop); |
4399 | } | |
28867cee | 4400 | goto mem_common; |
0fe59128 AK |
4401 | case OpMem16: |
4402 | ctxt->memop.bytes = 2; | |
4403 | goto mem_common; | |
4404 | case OpMem32: | |
4405 | ctxt->memop.bytes = 4; | |
4406 | goto mem_common; | |
4407 | case OpImmU16: | |
4408 | rc = decode_imm(ctxt, op, 2, false); | |
4409 | break; | |
4410 | case OpImmU: | |
4411 | rc = decode_imm(ctxt, op, imm_size(ctxt), false); | |
4412 | break; | |
4413 | case OpSI: | |
4414 | op->type = OP_MEM; | |
4415 | op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; | |
4416 | op->addr.mem.ea = | |
01485a22 | 4417 | register_address(ctxt, VCPU_REGS_RSI); |
573e80fe | 4418 | op->addr.mem.seg = ctxt->seg_override; |
0fe59128 | 4419 | op->val = 0; |
b3356bf0 | 4420 | op->count = 1; |
0fe59128 | 4421 | break; |
7fa57952 PB |
4422 | case OpXLat: |
4423 | op->type = OP_MEM; | |
4424 | op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; | |
4425 | op->addr.mem.ea = | |
01485a22 | 4426 | address_mask(ctxt, |
7fa57952 PB |
4427 | reg_read(ctxt, VCPU_REGS_RBX) + |
4428 | (reg_read(ctxt, VCPU_REGS_RAX) & 0xff)); | |
573e80fe | 4429 | op->addr.mem.seg = ctxt->seg_override; |
7fa57952 PB |
4430 | op->val = 0; |
4431 | break; | |
0fe59128 AK |
4432 | case OpImmFAddr: |
4433 | op->type = OP_IMM; | |
4434 | op->addr.mem.ea = ctxt->_eip; | |
4435 | op->bytes = ctxt->op_bytes + 2; | |
4436 | insn_fetch_arr(op->valptr, op->bytes, ctxt); | |
4437 | break; | |
4438 | case OpMemFAddr: | |
4439 | ctxt->memop.bytes = ctxt->op_bytes + 2; | |
4440 | goto mem_common; | |
c191a7a0 | 4441 | case OpES: |
d29b9d7e | 4442 | op->type = OP_IMM; |
c191a7a0 AK |
4443 | op->val = VCPU_SREG_ES; |
4444 | break; | |
4445 | case OpCS: | |
d29b9d7e | 4446 | op->type = OP_IMM; |
c191a7a0 AK |
4447 | op->val = VCPU_SREG_CS; |
4448 | break; | |
4449 | case OpSS: | |
d29b9d7e | 4450 | op->type = OP_IMM; |
c191a7a0 AK |
4451 | op->val = VCPU_SREG_SS; |
4452 | break; | |
4453 | case OpDS: | |
d29b9d7e | 4454 | op->type = OP_IMM; |
c191a7a0 AK |
4455 | op->val = VCPU_SREG_DS; |
4456 | break; | |
4457 | case OpFS: | |
d29b9d7e | 4458 | op->type = OP_IMM; |
c191a7a0 AK |
4459 | op->val = VCPU_SREG_FS; |
4460 | break; | |
4461 | case OpGS: | |
d29b9d7e | 4462 | op->type = OP_IMM; |
c191a7a0 AK |
4463 | op->val = VCPU_SREG_GS; |
4464 | break; | |
a9945549 AK |
4465 | case OpImplicit: |
4466 | /* Special instructions do their own operand decoding. */ | |
4467 | default: | |
4468 | op->type = OP_NONE; /* Disable writeback. */ | |
4469 | break; | |
4470 | } | |
4471 | ||
4472 | done: | |
4473 | return rc; | |
4474 | } | |
4475 | ||
ef5d75cc | 4476 | int x86_decode_insn(struct x86_emulate_ctxt *ctxt, void *insn, int insn_len) |
dde7e6d1 | 4477 | { |
dde7e6d1 AK |
4478 | int rc = X86EMUL_CONTINUE; |
4479 | int mode = ctxt->mode; | |
46561646 | 4480 | int def_op_bytes, def_ad_bytes, goffset, simd_prefix; |
0d7cdee8 | 4481 | bool op_prefix = false; |
573e80fe | 4482 | bool has_seg_override = false; |
46561646 | 4483 | struct opcode opcode; |
dde7e6d1 | 4484 | |
f09ed83e AK |
4485 | ctxt->memop.type = OP_NONE; |
4486 | ctxt->memopp = NULL; | |
9dac77fa | 4487 | ctxt->_eip = ctxt->eip; |
17052f16 PB |
4488 | ctxt->fetch.ptr = ctxt->fetch.data; |
4489 | ctxt->fetch.end = ctxt->fetch.data + insn_len; | |
1ce19dc1 | 4490 | ctxt->opcode_len = 1; |
dc25e89e | 4491 | if (insn_len > 0) |
9dac77fa | 4492 | memcpy(ctxt->fetch.data, insn, insn_len); |
285ca9e9 | 4493 | else { |
9506d57d | 4494 | rc = __do_insn_fetch_bytes(ctxt, 1); |
285ca9e9 PB |
4495 | if (rc != X86EMUL_CONTINUE) |
4496 | return rc; | |
4497 | } | |
dde7e6d1 AK |
4498 | |
4499 | switch (mode) { | |
4500 | case X86EMUL_MODE_REAL: | |
4501 | case X86EMUL_MODE_VM86: | |
4502 | case X86EMUL_MODE_PROT16: | |
4503 | def_op_bytes = def_ad_bytes = 2; | |
4504 | break; | |
4505 | case X86EMUL_MODE_PROT32: | |
4506 | def_op_bytes = def_ad_bytes = 4; | |
4507 | break; | |
4508 | #ifdef CONFIG_X86_64 | |
4509 | case X86EMUL_MODE_PROT64: | |
4510 | def_op_bytes = 4; | |
4511 | def_ad_bytes = 8; | |
4512 | break; | |
4513 | #endif | |
4514 | default: | |
1d2887e2 | 4515 | return EMULATION_FAILED; |
dde7e6d1 AK |
4516 | } |
4517 | ||
9dac77fa AK |
4518 | ctxt->op_bytes = def_op_bytes; |
4519 | ctxt->ad_bytes = def_ad_bytes; | |
dde7e6d1 AK |
4520 | |
4521 | /* Legacy prefixes. */ | |
4522 | for (;;) { | |
e85a1085 | 4523 | switch (ctxt->b = insn_fetch(u8, ctxt)) { |
dde7e6d1 | 4524 | case 0x66: /* operand-size override */ |
0d7cdee8 | 4525 | op_prefix = true; |
dde7e6d1 | 4526 | /* switch between 2/4 bytes */ |
9dac77fa | 4527 | ctxt->op_bytes = def_op_bytes ^ 6; |
dde7e6d1 AK |
4528 | break; |
4529 | case 0x67: /* address-size override */ | |
4530 | if (mode == X86EMUL_MODE_PROT64) | |
4531 | /* switch between 4/8 bytes */ | |
9dac77fa | 4532 | ctxt->ad_bytes = def_ad_bytes ^ 12; |
dde7e6d1 AK |
4533 | else |
4534 | /* switch between 2/4 bytes */ | |
9dac77fa | 4535 | ctxt->ad_bytes = def_ad_bytes ^ 6; |
dde7e6d1 AK |
4536 | break; |
4537 | case 0x26: /* ES override */ | |
4538 | case 0x2e: /* CS override */ | |
4539 | case 0x36: /* SS override */ | |
4540 | case 0x3e: /* DS override */ | |
573e80fe BD |
4541 | has_seg_override = true; |
4542 | ctxt->seg_override = (ctxt->b >> 3) & 3; | |
dde7e6d1 AK |
4543 | break; |
4544 | case 0x64: /* FS override */ | |
4545 | case 0x65: /* GS override */ | |
573e80fe BD |
4546 | has_seg_override = true; |
4547 | ctxt->seg_override = ctxt->b & 7; | |
dde7e6d1 AK |
4548 | break; |
4549 | case 0x40 ... 0x4f: /* REX */ | |
4550 | if (mode != X86EMUL_MODE_PROT64) | |
4551 | goto done_prefixes; | |
9dac77fa | 4552 | ctxt->rex_prefix = ctxt->b; |
dde7e6d1 AK |
4553 | continue; |
4554 | case 0xf0: /* LOCK */ | |
9dac77fa | 4555 | ctxt->lock_prefix = 1; |
dde7e6d1 AK |
4556 | break; |
4557 | case 0xf2: /* REPNE/REPNZ */ | |
dde7e6d1 | 4558 | case 0xf3: /* REP/REPE/REPZ */ |
9dac77fa | 4559 | ctxt->rep_prefix = ctxt->b; |
dde7e6d1 AK |
4560 | break; |
4561 | default: | |
4562 | goto done_prefixes; | |
4563 | } | |
4564 | ||
4565 | /* Any legacy prefix after a REX prefix nullifies its effect. */ | |
4566 | ||
9dac77fa | 4567 | ctxt->rex_prefix = 0; |
dde7e6d1 AK |
4568 | } |
4569 | ||
4570 | done_prefixes: | |
4571 | ||
4572 | /* REX prefix. */ | |
9dac77fa AK |
4573 | if (ctxt->rex_prefix & 8) |
4574 | ctxt->op_bytes = 8; /* REX.W */ | |
dde7e6d1 AK |
4575 | |
4576 | /* Opcode byte(s). */ | |
9dac77fa | 4577 | opcode = opcode_table[ctxt->b]; |
d3ad6243 | 4578 | /* Two-byte opcode? */ |
9dac77fa | 4579 | if (ctxt->b == 0x0f) { |
1ce19dc1 | 4580 | ctxt->opcode_len = 2; |
e85a1085 | 4581 | ctxt->b = insn_fetch(u8, ctxt); |
9dac77fa | 4582 | opcode = twobyte_table[ctxt->b]; |
0bc5eedb BP |
4583 | |
4584 | /* 0F_38 opcode map */ | |
4585 | if (ctxt->b == 0x38) { | |
4586 | ctxt->opcode_len = 3; | |
4587 | ctxt->b = insn_fetch(u8, ctxt); | |
4588 | opcode = opcode_map_0f_38[ctxt->b]; | |
4589 | } | |
dde7e6d1 | 4590 | } |
9dac77fa | 4591 | ctxt->d = opcode.flags; |
dde7e6d1 | 4592 | |
9f4260e7 TY |
4593 | if (ctxt->d & ModRM) |
4594 | ctxt->modrm = insn_fetch(u8, ctxt); | |
4595 | ||
7fe864dc NA |
4596 | /* vex-prefix instructions are not implemented */ |
4597 | if (ctxt->opcode_len == 1 && (ctxt->b == 0xc5 || ctxt->b == 0xc4) && | |
d14cb5df | 4598 | (mode == X86EMUL_MODE_PROT64 || (ctxt->modrm & 0xc0) == 0xc0)) { |
7fe864dc NA |
4599 | ctxt->d = NotImpl; |
4600 | } | |
4601 | ||
9dac77fa AK |
4602 | while (ctxt->d & GroupMask) { |
4603 | switch (ctxt->d & GroupMask) { | |
46561646 | 4604 | case Group: |
9dac77fa | 4605 | goffset = (ctxt->modrm >> 3) & 7; |
46561646 AK |
4606 | opcode = opcode.u.group[goffset]; |
4607 | break; | |
4608 | case GroupDual: | |
9dac77fa AK |
4609 | goffset = (ctxt->modrm >> 3) & 7; |
4610 | if ((ctxt->modrm >> 6) == 3) | |
46561646 AK |
4611 | opcode = opcode.u.gdual->mod3[goffset]; |
4612 | else | |
4613 | opcode = opcode.u.gdual->mod012[goffset]; | |
4614 | break; | |
4615 | case RMExt: | |
9dac77fa | 4616 | goffset = ctxt->modrm & 7; |
01de8b09 | 4617 | opcode = opcode.u.group[goffset]; |
46561646 AK |
4618 | break; |
4619 | case Prefix: | |
9dac77fa | 4620 | if (ctxt->rep_prefix && op_prefix) |
1d2887e2 | 4621 | return EMULATION_FAILED; |
9dac77fa | 4622 | simd_prefix = op_prefix ? 0x66 : ctxt->rep_prefix; |
46561646 AK |
4623 | switch (simd_prefix) { |
4624 | case 0x00: opcode = opcode.u.gprefix->pfx_no; break; | |
4625 | case 0x66: opcode = opcode.u.gprefix->pfx_66; break; | |
4626 | case 0xf2: opcode = opcode.u.gprefix->pfx_f2; break; | |
4627 | case 0xf3: opcode = opcode.u.gprefix->pfx_f3; break; | |
4628 | } | |
4629 | break; | |
045a282c GN |
4630 | case Escape: |
4631 | if (ctxt->modrm > 0xbf) | |
4632 | opcode = opcode.u.esc->high[ctxt->modrm - 0xc0]; | |
4633 | else | |
4634 | opcode = opcode.u.esc->op[(ctxt->modrm >> 3) & 7]; | |
4635 | break; | |
39f062ff NA |
4636 | case InstrDual: |
4637 | if ((ctxt->modrm >> 6) == 3) | |
4638 | opcode = opcode.u.idual->mod3; | |
4639 | else | |
4640 | opcode = opcode.u.idual->mod012; | |
4641 | break; | |
2276b511 NA |
4642 | case ModeDual: |
4643 | if (ctxt->mode == X86EMUL_MODE_PROT64) | |
4644 | opcode = opcode.u.mdual->mode64; | |
4645 | else | |
4646 | opcode = opcode.u.mdual->mode32; | |
4647 | break; | |
46561646 | 4648 | default: |
1d2887e2 | 4649 | return EMULATION_FAILED; |
0d7cdee8 | 4650 | } |
46561646 | 4651 | |
b1ea50b2 | 4652 | ctxt->d &= ~(u64)GroupMask; |
9dac77fa | 4653 | ctxt->d |= opcode.flags; |
0d7cdee8 AK |
4654 | } |
4655 | ||
e24186e0 PB |
4656 | /* Unrecognised? */ |
4657 | if (ctxt->d == 0) | |
4658 | return EMULATION_FAILED; | |
4659 | ||
9dac77fa | 4660 | ctxt->execute = opcode.u.execute; |
dde7e6d1 | 4661 | |
3a6095a0 NA |
4662 | if (unlikely(ctxt->ud) && likely(!(ctxt->d & EmulateOnUD))) |
4663 | return EMULATION_FAILED; | |
4664 | ||
d40a6898 | 4665 | if (unlikely(ctxt->d & |
ed9aad21 NA |
4666 | (NotImpl|Stack|Op3264|Sse|Mmx|Intercept|CheckPerm|NearBranch| |
4667 | No16))) { | |
d40a6898 PB |
4668 | /* |
4669 | * These are copied unconditionally here, and checked unconditionally | |
4670 | * in x86_emulate_insn. | |
4671 | */ | |
4672 | ctxt->check_perm = opcode.check_perm; | |
4673 | ctxt->intercept = opcode.intercept; | |
dde7e6d1 | 4674 | |
d40a6898 PB |
4675 | if (ctxt->d & NotImpl) |
4676 | return EMULATION_FAILED; | |
d867162c | 4677 | |
58b7075d NA |
4678 | if (mode == X86EMUL_MODE_PROT64) { |
4679 | if (ctxt->op_bytes == 4 && (ctxt->d & Stack)) | |
4680 | ctxt->op_bytes = 8; | |
4681 | else if (ctxt->d & NearBranch) | |
4682 | ctxt->op_bytes = 8; | |
4683 | } | |
7f9b4b75 | 4684 | |
d40a6898 PB |
4685 | if (ctxt->d & Op3264) { |
4686 | if (mode == X86EMUL_MODE_PROT64) | |
4687 | ctxt->op_bytes = 8; | |
4688 | else | |
4689 | ctxt->op_bytes = 4; | |
4690 | } | |
4691 | ||
ed9aad21 NA |
4692 | if ((ctxt->d & No16) && ctxt->op_bytes == 2) |
4693 | ctxt->op_bytes = 4; | |
4694 | ||
d40a6898 PB |
4695 | if (ctxt->d & Sse) |
4696 | ctxt->op_bytes = 16; | |
4697 | else if (ctxt->d & Mmx) | |
4698 | ctxt->op_bytes = 8; | |
4699 | } | |
1253791d | 4700 | |
dde7e6d1 | 4701 | /* ModRM and SIB bytes. */ |
9dac77fa | 4702 | if (ctxt->d & ModRM) { |
f09ed83e | 4703 | rc = decode_modrm(ctxt, &ctxt->memop); |
573e80fe BD |
4704 | if (!has_seg_override) { |
4705 | has_seg_override = true; | |
4706 | ctxt->seg_override = ctxt->modrm_seg; | |
4707 | } | |
9dac77fa | 4708 | } else if (ctxt->d & MemAbs) |
f09ed83e | 4709 | rc = decode_abs(ctxt, &ctxt->memop); |
dde7e6d1 AK |
4710 | if (rc != X86EMUL_CONTINUE) |
4711 | goto done; | |
4712 | ||
573e80fe BD |
4713 | if (!has_seg_override) |
4714 | ctxt->seg_override = VCPU_SREG_DS; | |
dde7e6d1 | 4715 | |
573e80fe | 4716 | ctxt->memop.addr.mem.seg = ctxt->seg_override; |
dde7e6d1 | 4717 | |
dde7e6d1 AK |
4718 | /* |
4719 | * Decode and fetch the source operand: register, memory | |
4720 | * or immediate. | |
4721 | */ | |
0fe59128 | 4722 | rc = decode_operand(ctxt, &ctxt->src, (ctxt->d >> SrcShift) & OpMask); |
39f21ee5 AK |
4723 | if (rc != X86EMUL_CONTINUE) |
4724 | goto done; | |
4725 | ||
dde7e6d1 AK |
4726 | /* |
4727 | * Decode and fetch the second source operand: register, memory | |
4728 | * or immediate. | |
4729 | */ | |
4dd6a57d | 4730 | rc = decode_operand(ctxt, &ctxt->src2, (ctxt->d >> Src2Shift) & OpMask); |
39f21ee5 AK |
4731 | if (rc != X86EMUL_CONTINUE) |
4732 | goto done; | |
4733 | ||
dde7e6d1 | 4734 | /* Decode and fetch the destination operand: register or memory. */ |
a9945549 | 4735 | rc = decode_operand(ctxt, &ctxt->dst, (ctxt->d >> DstShift) & OpMask); |
dde7e6d1 | 4736 | |
41061cdb | 4737 | if (ctxt->rip_relative) |
1c1c35ae NA |
4738 | ctxt->memopp->addr.mem.ea = address_mask(ctxt, |
4739 | ctxt->memopp->addr.mem.ea + ctxt->_eip); | |
cb16c348 | 4740 | |
a430c916 | 4741 | done: |
1d2887e2 | 4742 | return (rc != X86EMUL_CONTINUE) ? EMULATION_FAILED : EMULATION_OK; |
dde7e6d1 AK |
4743 | } |
4744 | ||
1cb3f3ae XG |
4745 | bool x86_page_table_writing_insn(struct x86_emulate_ctxt *ctxt) |
4746 | { | |
4747 | return ctxt->d & PageTable; | |
4748 | } | |
4749 | ||
3e2f65d5 GN |
4750 | static bool string_insn_completed(struct x86_emulate_ctxt *ctxt) |
4751 | { | |
3e2f65d5 GN |
4752 | /* The second termination condition only applies for REPE |
4753 | * and REPNE. Test if the repeat string operation prefix is | |
4754 | * REPE/REPZ or REPNE/REPNZ and if it's the case it tests the | |
4755 | * corresponding termination condition according to: | |
4756 | * - if REPE/REPZ and ZF = 0 then done | |
4757 | * - if REPNE/REPNZ and ZF = 1 then done | |
4758 | */ | |
9dac77fa AK |
4759 | if (((ctxt->b == 0xa6) || (ctxt->b == 0xa7) || |
4760 | (ctxt->b == 0xae) || (ctxt->b == 0xaf)) | |
4761 | && (((ctxt->rep_prefix == REPE_PREFIX) && | |
3e2f65d5 | 4762 | ((ctxt->eflags & EFLG_ZF) == 0)) |
9dac77fa | 4763 | || ((ctxt->rep_prefix == REPNE_PREFIX) && |
3e2f65d5 GN |
4764 | ((ctxt->eflags & EFLG_ZF) == EFLG_ZF)))) |
4765 | return true; | |
4766 | ||
4767 | return false; | |
4768 | } | |
4769 | ||
cbe2c9d3 AK |
4770 | static int flush_pending_x87_faults(struct x86_emulate_ctxt *ctxt) |
4771 | { | |
4772 | bool fault = false; | |
4773 | ||
4774 | ctxt->ops->get_fpu(ctxt); | |
4775 | asm volatile("1: fwait \n\t" | |
4776 | "2: \n\t" | |
4777 | ".pushsection .fixup,\"ax\" \n\t" | |
4778 | "3: \n\t" | |
4779 | "movb $1, %[fault] \n\t" | |
4780 | "jmp 2b \n\t" | |
4781 | ".popsection \n\t" | |
4782 | _ASM_EXTABLE(1b, 3b) | |
38e8a2dd | 4783 | : [fault]"+qm"(fault)); |
cbe2c9d3 AK |
4784 | ctxt->ops->put_fpu(ctxt); |
4785 | ||
4786 | if (unlikely(fault)) | |
4787 | return emulate_exception(ctxt, MF_VECTOR, 0, false); | |
4788 | ||
4789 | return X86EMUL_CONTINUE; | |
4790 | } | |
4791 | ||
4792 | static void fetch_possible_mmx_operand(struct x86_emulate_ctxt *ctxt, | |
4793 | struct operand *op) | |
4794 | { | |
4795 | if (op->type == OP_MM) | |
4796 | read_mmx_reg(ctxt, &op->mm_val, op->addr.mm); | |
4797 | } | |
4798 | ||
e28bbd44 AK |
4799 | static int fastop(struct x86_emulate_ctxt *ctxt, void (*fop)(struct fastop *)) |
4800 | { | |
4801 | ulong flags = (ctxt->eflags & EFLAGS_MASK) | X86_EFLAGS_IF; | |
b9fa409b AK |
4802 | if (!(ctxt->d & ByteOp)) |
4803 | fop += __ffs(ctxt->dst.bytes) * FASTOP_SIZE; | |
e28bbd44 | 4804 | asm("push %[flags]; popf; call *%[fastop]; pushf; pop %[flags]\n" |
b8c0b6ae AK |
4805 | : "+a"(ctxt->dst.val), "+d"(ctxt->src.val), [flags]"+D"(flags), |
4806 | [fastop]"+S"(fop) | |
4807 | : "c"(ctxt->src2.val)); | |
e28bbd44 | 4808 | ctxt->eflags = (ctxt->eflags & ~EFLAGS_MASK) | (flags & EFLAGS_MASK); |
b8c0b6ae AK |
4809 | if (!fop) /* exception is returned in fop variable */ |
4810 | return emulate_de(ctxt); | |
e28bbd44 AK |
4811 | return X86EMUL_CONTINUE; |
4812 | } | |
dd856efa | 4813 | |
1498507a BD |
4814 | void init_decode_cache(struct x86_emulate_ctxt *ctxt) |
4815 | { | |
573e80fe BD |
4816 | memset(&ctxt->rip_relative, 0, |
4817 | (void *)&ctxt->modrm - (void *)&ctxt->rip_relative); | |
1498507a | 4818 | |
1498507a BD |
4819 | ctxt->io_read.pos = 0; |
4820 | ctxt->io_read.end = 0; | |
1498507a BD |
4821 | ctxt->mem_read.end = 0; |
4822 | } | |
4823 | ||
7b105ca2 | 4824 | int x86_emulate_insn(struct x86_emulate_ctxt *ctxt) |
8b4caf66 | 4825 | { |
0225fb50 | 4826 | const struct x86_emulate_ops *ops = ctxt->ops; |
1b30eaa8 | 4827 | int rc = X86EMUL_CONTINUE; |
9dac77fa | 4828 | int saved_dst_type = ctxt->dst.type; |
8b4caf66 | 4829 | |
9dac77fa | 4830 | ctxt->mem_read.pos = 0; |
310b5d30 | 4831 | |
e24186e0 PB |
4832 | /* LOCK prefix is allowed only with some instructions */ |
4833 | if (ctxt->lock_prefix && (!(ctxt->d & Lock) || ctxt->dst.type != OP_MEM)) { | |
35d3d4a1 | 4834 | rc = emulate_ud(ctxt); |
1161624f GN |
4835 | goto done; |
4836 | } | |
4837 | ||
e24186e0 | 4838 | if ((ctxt->d & SrcMask) == SrcMemFAddr && ctxt->src.type != OP_MEM) { |
35d3d4a1 | 4839 | rc = emulate_ud(ctxt); |
d380a5e4 GN |
4840 | goto done; |
4841 | } | |
4842 | ||
d40a6898 PB |
4843 | if (unlikely(ctxt->d & |
4844 | (No64|Undefined|Sse|Mmx|Intercept|CheckPerm|Priv|Prot|String))) { | |
4845 | if ((ctxt->mode == X86EMUL_MODE_PROT64 && (ctxt->d & No64)) || | |
4846 | (ctxt->d & Undefined)) { | |
4847 | rc = emulate_ud(ctxt); | |
4848 | goto done; | |
4849 | } | |
1253791d | 4850 | |
d40a6898 PB |
4851 | if (((ctxt->d & (Sse|Mmx)) && ((ops->get_cr(ctxt, 0) & X86_CR0_EM))) |
4852 | || ((ctxt->d & Sse) && !(ops->get_cr(ctxt, 4) & X86_CR4_OSFXSR))) { | |
4853 | rc = emulate_ud(ctxt); | |
cbe2c9d3 | 4854 | goto done; |
d40a6898 | 4855 | } |
cbe2c9d3 | 4856 | |
d40a6898 PB |
4857 | if ((ctxt->d & (Sse|Mmx)) && (ops->get_cr(ctxt, 0) & X86_CR0_TS)) { |
4858 | rc = emulate_nm(ctxt); | |
c4f035c6 | 4859 | goto done; |
d40a6898 | 4860 | } |
c4f035c6 | 4861 | |
d40a6898 PB |
4862 | if (ctxt->d & Mmx) { |
4863 | rc = flush_pending_x87_faults(ctxt); | |
4864 | if (rc != X86EMUL_CONTINUE) | |
4865 | goto done; | |
4866 | /* | |
4867 | * Now that we know the fpu is exception safe, we can fetch | |
4868 | * operands from it. | |
4869 | */ | |
4870 | fetch_possible_mmx_operand(ctxt, &ctxt->src); | |
4871 | fetch_possible_mmx_operand(ctxt, &ctxt->src2); | |
4872 | if (!(ctxt->d & Mov)) | |
4873 | fetch_possible_mmx_operand(ctxt, &ctxt->dst); | |
4874 | } | |
e92805ac | 4875 | |
685bbf4a | 4876 | if (unlikely(ctxt->guest_mode) && (ctxt->d & Intercept)) { |
d40a6898 PB |
4877 | rc = emulator_check_intercept(ctxt, ctxt->intercept, |
4878 | X86_ICPT_PRE_EXCEPT); | |
4879 | if (rc != X86EMUL_CONTINUE) | |
4880 | goto done; | |
4881 | } | |
8ea7d6ae | 4882 | |
64a38292 NA |
4883 | /* Instruction can only be executed in protected mode */ |
4884 | if ((ctxt->d & Prot) && ctxt->mode < X86EMUL_MODE_PROT16) { | |
4885 | rc = emulate_ud(ctxt); | |
4886 | goto done; | |
4887 | } | |
4888 | ||
d40a6898 PB |
4889 | /* Privileged instruction can be executed only in CPL=0 */ |
4890 | if ((ctxt->d & Priv) && ops->cpl(ctxt)) { | |
68efa764 NA |
4891 | if (ctxt->d & PrivUD) |
4892 | rc = emulate_ud(ctxt); | |
4893 | else | |
4894 | rc = emulate_gp(ctxt, 0); | |
d09beabd | 4895 | goto done; |
d40a6898 | 4896 | } |
d09beabd | 4897 | |
d40a6898 | 4898 | /* Do instruction specific permission checks */ |
685bbf4a | 4899 | if (ctxt->d & CheckPerm) { |
d40a6898 PB |
4900 | rc = ctxt->check_perm(ctxt); |
4901 | if (rc != X86EMUL_CONTINUE) | |
4902 | goto done; | |
4903 | } | |
4904 | ||
685bbf4a | 4905 | if (unlikely(ctxt->guest_mode) && (ctxt->d & Intercept)) { |
d40a6898 PB |
4906 | rc = emulator_check_intercept(ctxt, ctxt->intercept, |
4907 | X86_ICPT_POST_EXCEPT); | |
4908 | if (rc != X86EMUL_CONTINUE) | |
4909 | goto done; | |
4910 | } | |
4911 | ||
4912 | if (ctxt->rep_prefix && (ctxt->d & String)) { | |
4913 | /* All REP prefixes have the same first termination condition */ | |
4914 | if (address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) == 0) { | |
4915 | ctxt->eip = ctxt->_eip; | |
4467c3f1 | 4916 | ctxt->eflags &= ~EFLG_RF; |
d40a6898 PB |
4917 | goto done; |
4918 | } | |
b9fa9d6b | 4919 | } |
b9fa9d6b AK |
4920 | } |
4921 | ||
9dac77fa AK |
4922 | if ((ctxt->src.type == OP_MEM) && !(ctxt->d & NoAccess)) { |
4923 | rc = segmented_read(ctxt, ctxt->src.addr.mem, | |
4924 | ctxt->src.valptr, ctxt->src.bytes); | |
b60d513c | 4925 | if (rc != X86EMUL_CONTINUE) |
8b4caf66 | 4926 | goto done; |
9dac77fa | 4927 | ctxt->src.orig_val64 = ctxt->src.val64; |
8b4caf66 LV |
4928 | } |
4929 | ||
9dac77fa AK |
4930 | if (ctxt->src2.type == OP_MEM) { |
4931 | rc = segmented_read(ctxt, ctxt->src2.addr.mem, | |
4932 | &ctxt->src2.val, ctxt->src2.bytes); | |
e35b7b9c GN |
4933 | if (rc != X86EMUL_CONTINUE) |
4934 | goto done; | |
4935 | } | |
4936 | ||
9dac77fa | 4937 | if ((ctxt->d & DstMask) == ImplicitOps) |
8b4caf66 LV |
4938 | goto special_insn; |
4939 | ||
4940 | ||
9dac77fa | 4941 | if ((ctxt->dst.type == OP_MEM) && !(ctxt->d & Mov)) { |
69f55cb1 | 4942 | /* optimisation - avoid slow emulated read if Mov */ |
9dac77fa AK |
4943 | rc = segmented_read(ctxt, ctxt->dst.addr.mem, |
4944 | &ctxt->dst.val, ctxt->dst.bytes); | |
c205fb7d | 4945 | if (rc != X86EMUL_CONTINUE) { |
d44e1212 PB |
4946 | if (!(ctxt->d & NoWrite) && |
4947 | rc == X86EMUL_PROPAGATE_FAULT && | |
c205fb7d NA |
4948 | ctxt->exception.vector == PF_VECTOR) |
4949 | ctxt->exception.error_code |= PFERR_WRITE_MASK; | |
69f55cb1 | 4950 | goto done; |
c205fb7d | 4951 | } |
038e51de | 4952 | } |
4ff6f8e6 PB |
4953 | /* Copy full 64-bit value for CMPXCHG8B. */ |
4954 | ctxt->dst.orig_val64 = ctxt->dst.val64; | |
038e51de | 4955 | |
018a98db AK |
4956 | special_insn: |
4957 | ||
685bbf4a | 4958 | if (unlikely(ctxt->guest_mode) && (ctxt->d & Intercept)) { |
9dac77fa | 4959 | rc = emulator_check_intercept(ctxt, ctxt->intercept, |
8a76d7f2 | 4960 | X86_ICPT_POST_MEMACCESS); |
c4f035c6 AK |
4961 | if (rc != X86EMUL_CONTINUE) |
4962 | goto done; | |
4963 | } | |
4964 | ||
b9a1ecb9 NA |
4965 | if (ctxt->rep_prefix && (ctxt->d & String)) |
4966 | ctxt->eflags |= EFLG_RF; | |
4967 | else | |
4968 | ctxt->eflags &= ~EFLG_RF; | |
4467c3f1 | 4969 | |
9dac77fa | 4970 | if (ctxt->execute) { |
e28bbd44 AK |
4971 | if (ctxt->d & Fastop) { |
4972 | void (*fop)(struct fastop *) = (void *)ctxt->execute; | |
4973 | rc = fastop(ctxt, fop); | |
4974 | if (rc != X86EMUL_CONTINUE) | |
4975 | goto done; | |
4976 | goto writeback; | |
4977 | } | |
9dac77fa | 4978 | rc = ctxt->execute(ctxt); |
ef65c889 AK |
4979 | if (rc != X86EMUL_CONTINUE) |
4980 | goto done; | |
4981 | goto writeback; | |
4982 | } | |
4983 | ||
1ce19dc1 | 4984 | if (ctxt->opcode_len == 2) |
6aa8b732 | 4985 | goto twobyte_insn; |
0bc5eedb BP |
4986 | else if (ctxt->opcode_len == 3) |
4987 | goto threebyte_insn; | |
6aa8b732 | 4988 | |
9dac77fa | 4989 | switch (ctxt->b) { |
b2833e3c | 4990 | case 0x70 ... 0x7f: /* jcc (short) */ |
9dac77fa | 4991 | if (test_cc(ctxt->b, ctxt->eflags)) |
234f3ce4 | 4992 | rc = jmp_rel(ctxt, ctxt->src.val); |
018a98db | 4993 | break; |
7e0b54b1 | 4994 | case 0x8d: /* lea r16/r32, m */ |
9dac77fa | 4995 | ctxt->dst.val = ctxt->src.addr.mem.ea; |
7e0b54b1 | 4996 | break; |
3d9e77df | 4997 | case 0x90 ... 0x97: /* nop / xchg reg, rax */ |
dd856efa | 4998 | if (ctxt->dst.addr.reg == reg_rmw(ctxt, VCPU_REGS_RAX)) |
a825f5cc NA |
4999 | ctxt->dst.type = OP_NONE; |
5000 | else | |
5001 | rc = em_xchg(ctxt); | |
e4f973ae | 5002 | break; |
e8b6fa70 | 5003 | case 0x98: /* cbw/cwde/cdqe */ |
9dac77fa AK |
5004 | switch (ctxt->op_bytes) { |
5005 | case 2: ctxt->dst.val = (s8)ctxt->dst.val; break; | |
5006 | case 4: ctxt->dst.val = (s16)ctxt->dst.val; break; | |
5007 | case 8: ctxt->dst.val = (s32)ctxt->dst.val; break; | |
e8b6fa70 WY |
5008 | } |
5009 | break; | |
6e154e56 | 5010 | case 0xcc: /* int3 */ |
5c5df76b TY |
5011 | rc = emulate_int(ctxt, 3); |
5012 | break; | |
6e154e56 | 5013 | case 0xcd: /* int n */ |
9dac77fa | 5014 | rc = emulate_int(ctxt, ctxt->src.val); |
6e154e56 MG |
5015 | break; |
5016 | case 0xce: /* into */ | |
5c5df76b TY |
5017 | if (ctxt->eflags & EFLG_OF) |
5018 | rc = emulate_int(ctxt, 4); | |
6e154e56 | 5019 | break; |
1a52e051 | 5020 | case 0xe9: /* jmp rel */ |
db5b0762 | 5021 | case 0xeb: /* jmp rel short */ |
234f3ce4 | 5022 | rc = jmp_rel(ctxt, ctxt->src.val); |
9dac77fa | 5023 | ctxt->dst.type = OP_NONE; /* Disable writeback. */ |
1a52e051 | 5024 | break; |
111de5d6 | 5025 | case 0xf4: /* hlt */ |
6c3287f7 | 5026 | ctxt->ops->halt(ctxt); |
19fdfa0d | 5027 | break; |
111de5d6 AK |
5028 | case 0xf5: /* cmc */ |
5029 | /* complement carry flag from eflags reg */ | |
5030 | ctxt->eflags ^= EFLG_CF; | |
111de5d6 AK |
5031 | break; |
5032 | case 0xf8: /* clc */ | |
5033 | ctxt->eflags &= ~EFLG_CF; | |
111de5d6 | 5034 | break; |
8744aa9a MG |
5035 | case 0xf9: /* stc */ |
5036 | ctxt->eflags |= EFLG_CF; | |
5037 | break; | |
fb4616f4 MG |
5038 | case 0xfc: /* cld */ |
5039 | ctxt->eflags &= ~EFLG_DF; | |
fb4616f4 MG |
5040 | break; |
5041 | case 0xfd: /* std */ | |
5042 | ctxt->eflags |= EFLG_DF; | |
fb4616f4 | 5043 | break; |
91269b8f AK |
5044 | default: |
5045 | goto cannot_emulate; | |
6aa8b732 | 5046 | } |
018a98db | 5047 | |
7d9ddaed AK |
5048 | if (rc != X86EMUL_CONTINUE) |
5049 | goto done; | |
5050 | ||
018a98db | 5051 | writeback: |
fb32b1ed AK |
5052 | if (ctxt->d & SrcWrite) { |
5053 | BUG_ON(ctxt->src.type == OP_MEM || ctxt->src.type == OP_MEM_STR); | |
5054 | rc = writeback(ctxt, &ctxt->src); | |
5055 | if (rc != X86EMUL_CONTINUE) | |
5056 | goto done; | |
5057 | } | |
ee212297 NA |
5058 | if (!(ctxt->d & NoWrite)) { |
5059 | rc = writeback(ctxt, &ctxt->dst); | |
5060 | if (rc != X86EMUL_CONTINUE) | |
5061 | goto done; | |
5062 | } | |
018a98db | 5063 | |
5cd21917 GN |
5064 | /* |
5065 | * restore dst type in case the decoding will be reused | |
5066 | * (happens for string instruction ) | |
5067 | */ | |
9dac77fa | 5068 | ctxt->dst.type = saved_dst_type; |
5cd21917 | 5069 | |
9dac77fa | 5070 | if ((ctxt->d & SrcMask) == SrcSI) |
f3bd64c6 | 5071 | string_addr_inc(ctxt, VCPU_REGS_RSI, &ctxt->src); |
a682e354 | 5072 | |
9dac77fa | 5073 | if ((ctxt->d & DstMask) == DstDI) |
f3bd64c6 | 5074 | string_addr_inc(ctxt, VCPU_REGS_RDI, &ctxt->dst); |
d9271123 | 5075 | |
9dac77fa | 5076 | if (ctxt->rep_prefix && (ctxt->d & String)) { |
b3356bf0 | 5077 | unsigned int count; |
9dac77fa | 5078 | struct read_cache *r = &ctxt->io_read; |
b3356bf0 GN |
5079 | if ((ctxt->d & SrcMask) == SrcSI) |
5080 | count = ctxt->src.count; | |
5081 | else | |
5082 | count = ctxt->dst.count; | |
01485a22 | 5083 | register_address_increment(ctxt, VCPU_REGS_RCX, -count); |
3e2f65d5 | 5084 | |
d2ddd1c4 GN |
5085 | if (!string_insn_completed(ctxt)) { |
5086 | /* | |
5087 | * Re-enter guest when pio read ahead buffer is empty | |
5088 | * or, if it is not used, after each 1024 iteration. | |
5089 | */ | |
dd856efa | 5090 | if ((r->end != 0 || reg_read(ctxt, VCPU_REGS_RCX) & 0x3ff) && |
d2ddd1c4 GN |
5091 | (r->end == 0 || r->end != r->pos)) { |
5092 | /* | |
5093 | * Reset read cache. Usually happens before | |
5094 | * decode, but since instruction is restarted | |
5095 | * we have to do it here. | |
5096 | */ | |
9dac77fa | 5097 | ctxt->mem_read.end = 0; |
dd856efa | 5098 | writeback_registers(ctxt); |
d2ddd1c4 GN |
5099 | return EMULATION_RESTART; |
5100 | } | |
5101 | goto done; /* skip rip writeback */ | |
0fa6ccbd | 5102 | } |
b9a1ecb9 | 5103 | ctxt->eflags &= ~EFLG_RF; |
5cd21917 | 5104 | } |
d2ddd1c4 | 5105 | |
9dac77fa | 5106 | ctxt->eip = ctxt->_eip; |
018a98db AK |
5107 | |
5108 | done: | |
e0ad0b47 PB |
5109 | if (rc == X86EMUL_PROPAGATE_FAULT) { |
5110 | WARN_ON(ctxt->exception.vector > 0x1f); | |
da9cb575 | 5111 | ctxt->have_exception = true; |
e0ad0b47 | 5112 | } |
775fde86 JR |
5113 | if (rc == X86EMUL_INTERCEPTED) |
5114 | return EMULATION_INTERCEPTED; | |
5115 | ||
dd856efa AK |
5116 | if (rc == X86EMUL_CONTINUE) |
5117 | writeback_registers(ctxt); | |
5118 | ||
d2ddd1c4 | 5119 | return (rc == X86EMUL_UNHANDLEABLE) ? EMULATION_FAILED : EMULATION_OK; |
6aa8b732 AK |
5120 | |
5121 | twobyte_insn: | |
9dac77fa | 5122 | switch (ctxt->b) { |
018a98db | 5123 | case 0x09: /* wbinvd */ |
cfb22375 | 5124 | (ctxt->ops->wbinvd)(ctxt); |
f5f48ee1 SY |
5125 | break; |
5126 | case 0x08: /* invd */ | |
018a98db AK |
5127 | case 0x0d: /* GrpP (prefetch) */ |
5128 | case 0x18: /* Grp16 (prefetch/nop) */ | |
103f98ea | 5129 | case 0x1f: /* nop */ |
018a98db AK |
5130 | break; |
5131 | case 0x20: /* mov cr, reg */ | |
9dac77fa | 5132 | ctxt->dst.val = ops->get_cr(ctxt, ctxt->modrm_reg); |
018a98db | 5133 | break; |
6aa8b732 | 5134 | case 0x21: /* mov from dr to reg */ |
9dac77fa | 5135 | ops->get_dr(ctxt, ctxt->modrm_reg, &ctxt->dst.val); |
6aa8b732 | 5136 | break; |
6aa8b732 | 5137 | case 0x40 ... 0x4f: /* cmov */ |
140bad89 NA |
5138 | if (test_cc(ctxt->b, ctxt->eflags)) |
5139 | ctxt->dst.val = ctxt->src.val; | |
5140 | else if (ctxt->mode != X86EMUL_MODE_PROT64 || | |
5141 | ctxt->op_bytes != 4) | |
9dac77fa | 5142 | ctxt->dst.type = OP_NONE; /* no writeback */ |
6aa8b732 | 5143 | break; |
b2833e3c | 5144 | case 0x80 ... 0x8f: /* jnz rel, etc*/ |
9dac77fa | 5145 | if (test_cc(ctxt->b, ctxt->eflags)) |
234f3ce4 | 5146 | rc = jmp_rel(ctxt, ctxt->src.val); |
018a98db | 5147 | break; |
ee45b58e | 5148 | case 0x90 ... 0x9f: /* setcc r/m8 */ |
9dac77fa | 5149 | ctxt->dst.val = test_cc(ctxt->b, ctxt->eflags); |
ee45b58e | 5150 | break; |
6aa8b732 | 5151 | case 0xb6 ... 0xb7: /* movzx */ |
9dac77fa | 5152 | ctxt->dst.bytes = ctxt->op_bytes; |
361cad2b | 5153 | ctxt->dst.val = (ctxt->src.bytes == 1) ? (u8) ctxt->src.val |
9dac77fa | 5154 | : (u16) ctxt->src.val; |
6aa8b732 | 5155 | break; |
6aa8b732 | 5156 | case 0xbe ... 0xbf: /* movsx */ |
9dac77fa | 5157 | ctxt->dst.bytes = ctxt->op_bytes; |
361cad2b | 5158 | ctxt->dst.val = (ctxt->src.bytes == 1) ? (s8) ctxt->src.val : |
9dac77fa | 5159 | (s16) ctxt->src.val; |
6aa8b732 | 5160 | break; |
91269b8f AK |
5161 | default: |
5162 | goto cannot_emulate; | |
6aa8b732 | 5163 | } |
7d9ddaed | 5164 | |
0bc5eedb BP |
5165 | threebyte_insn: |
5166 | ||
7d9ddaed AK |
5167 | if (rc != X86EMUL_CONTINUE) |
5168 | goto done; | |
5169 | ||
6aa8b732 AK |
5170 | goto writeback; |
5171 | ||
5172 | cannot_emulate: | |
a0c0ab2f | 5173 | return EMULATION_FAILED; |
6aa8b732 | 5174 | } |
dd856efa AK |
5175 | |
5176 | void emulator_invalidate_register_cache(struct x86_emulate_ctxt *ctxt) | |
5177 | { | |
5178 | invalidate_registers(ctxt); | |
5179 | } | |
5180 | ||
5181 | void emulator_writeback_register_cache(struct x86_emulate_ctxt *ctxt) | |
5182 | { | |
5183 | writeback_registers(ctxt); | |
5184 | } |