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73edf7b756d34acc682bb0c8e1a1891866ca874d
[wine/wine64.git] / dlls / kernel32 / instr.c
blob73edf7b756d34acc682bb0c8e1a1891866ca874d
1 /*
2 * Emulation of privileged instructions
3 *
4 * Copyright 1995 Alexandre Julliard
5 * Copyright 2005 Ivan Leo Puoti
6 * Copyright 2005 Laurent Pinchart
7 *
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
21 */
22
23 #include "config.h"
24 #include "wine/port.h"
25
26 #include <stdarg.h>
27
28 #include "windef.h"
29 #include "winbase.h"
30 #include "winternl.h"
31 #include "wine/winuser16.h"
32 #include "excpt.h"
33 #include "wine/debug.h"
34 #include "kernel_private.h"
35 #include "kernel16_private.h"
36 #include "wine/exception.h"
37
38 WINE_DEFAULT_DEBUG_CHANNEL(int);
39 WINE_DECLARE_DEBUG_CHANNEL(io);
40
41 /* macros to set parts of a DWORD */
42 #define SET_LOWORD(dw,val) ((dw) = ((dw) & 0xffff0000) | LOWORD(val))
43 #define SET_LOBYTE(dw,val) ((dw) = ((dw) & 0xffffff00) | LOBYTE(val))
44 #define ADD_LOWORD(dw,val) ((dw) = ((dw) & 0xffff0000) | LOWORD((DWORD)(dw)+(val)))
45 #define ISV86(context) ((context)->EFlags & 0x00020000)
46
47 static inline void add_stack( CONTEXT86 *context, int offset )
48 {
49 if (ISV86(context) || !IS_SELECTOR_32BIT(context->SegSs))
50 ADD_LOWORD( context->Esp, offset );
51 else
52 context->Esp += offset;
53 }
54
55 static inline void *make_ptr( CONTEXT86 *context, DWORD seg, DWORD off, int long_addr )
56 {
57 if (ISV86(context)) return (void *)((seg << 4) + LOWORD(off));
58 if (wine_ldt_is_system(seg)) return (void *)off;
59 if (!long_addr) off = LOWORD(off);
60 return (char *) MapSL( MAKESEGPTR( seg, 0 ) ) + off;
61 }
62
63 static inline void *get_stack( CONTEXT86 *context )
64 {
65 if (ISV86(context)) return (void *)((context->SegSs << 4) + LOWORD(context->Esp));
66 return wine_ldt_get_ptr( context->SegSs, context->Esp );
67 }
68
69 #include "pshpack1.h"
70 struct idtr
71 {
72 WORD limit;
73 BYTE *base;
74 };
75 #include "poppack.h"
76
77 static LDT_ENTRY idt[256];
78
79 static inline struct idtr get_idtr(void)
80 {
81 struct idtr ret;
82 #if defined(__i386__) && defined(__GNUC__)
83 __asm__( "sidtl %0" : "=m" (ret) );
84 #else
85 ret.base = (BYTE *)idt;
86 ret.limit = sizeof(idt) - 1;
87 #endif
88 return ret;
89 }
90
91
92 /***********************************************************************
93 * INSTR_ReplaceSelector
94 *
95 * Try to replace an invalid selector by a valid one.
96 * The only selector where it is allowed to do "mov ax,40;mov es,ax"
97 * is the so called 'bimodal' selector 0x40, which points to the BIOS
98 * data segment. Used by (at least) Borland products (and programs compiled
99 * using Borland products).
100 *
101 * See Undocumented Windows, Chapter 5, __0040.
102 */
103 static BOOL INSTR_ReplaceSelector( CONTEXT86 *context, WORD *sel )
104 {
105 if (*sel == 0x40)
106 {
107 static WORD sys_timer = 0;
108 if (!sys_timer)
109 {
110 if (!winedos.BiosTick) load_winedos();
111 if (winedos.BiosTick)
112 sys_timer = CreateSystemTimer( 55, winedos.BiosTick );
113 }
114 *sel = DOSMEM_BiosDataSeg;
115 return TRUE;
116 }
117 return FALSE; /* Can't replace selector, crashdump */
118 }
119
120
121 /* store an operand into a register */
122 static void store_reg( CONTEXT86 *context, BYTE regmodrm, const BYTE *addr, int long_op )
123 {
124 switch((regmodrm >> 3) & 7)
125 {
126 case 0:
127 if (long_op) context->Eax = *(const DWORD *)addr;
128 else SET_LOWORD(context->Eax, *(const WORD *)addr);
129 break;
130 case 1:
131 if (long_op) context->Ecx = *(const DWORD *)addr;
132 else SET_LOWORD(context->Ecx, *(const WORD *)addr);
133 break;
134 case 2:
135 if (long_op) context->Edx = *(const DWORD *)addr;
136 else SET_LOWORD(context->Edx, *(const WORD *)addr);
137 break;
138 case 3:
139 if (long_op) context->Ebx = *(const DWORD *)addr;
140 else SET_LOWORD(context->Ebx, *(const WORD *)addr);
141 break;
142 case 4:
143 if (long_op) context->Esp = *(const DWORD *)addr;
144 else SET_LOWORD(context->Esp, *(const WORD *)addr);
145 break;
146 case 5:
147 if (long_op) context->Ebp = *(const DWORD *)addr;
148 else SET_LOWORD(context->Ebp, *(const WORD *)addr);
149 break;
150 case 6:
151 if (long_op) context->Esi = *(const DWORD *)addr;
152 else SET_LOWORD(context->Esi, *(const WORD *)addr);
153 break;
154 case 7:
155 if (long_op) context->Edi = *(const DWORD *)addr;
156 else SET_LOWORD(context->Edi, *(const WORD *)addr);
157 break;
158 }
159 }
160
161 /***********************************************************************
162 * INSTR_GetOperandAddr
163 *
164 * Return the address of an instruction operand (from the mod/rm byte).
165 */
166 static BYTE *INSTR_GetOperandAddr( CONTEXT86 *context, BYTE *instr,
167 int long_addr, int segprefix, int *len )
168 {
169 int mod, rm, base = 0, index = 0, ss = 0, seg = 0, off;
170 LDT_ENTRY entry;
171
172 #define GET_VAL(val,type) \
173 { *val = *(type *)instr; instr += sizeof(type); *len += sizeof(type); }
174
175 *len = 0;
176 GET_VAL( &mod, BYTE );
177 rm = mod & 7;
178 mod >>= 6;
179
180 if (mod == 3)
181 {
182 switch(rm)
183 {
184 case 0: return (BYTE *)&context->Eax;
185 case 1: return (BYTE *)&context->Ecx;
186 case 2: return (BYTE *)&context->Edx;
187 case 3: return (BYTE *)&context->Ebx;
188 case 4: return (BYTE *)&context->Esp;
189 case 5: return (BYTE *)&context->Ebp;
190 case 6: return (BYTE *)&context->Esi;
191 case 7: return (BYTE *)&context->Edi;
192 }
193 }
194
195 if (long_addr)
196 {
197 if (rm == 4)
198 {
199 BYTE sib;
200 GET_VAL( &sib, BYTE );
201 rm = sib & 7;
202 ss = sib >> 6;
203 switch(sib >> 3)
204 {
205 case 0: index = context->Eax; break;
206 case 1: index = context->Ecx; break;
207 case 2: index = context->Edx; break;
208 case 3: index = context->Ebx; break;
209 case 4: index = 0; break;
210 case 5: index = context->Ebp; break;
211 case 6: index = context->Esi; break;
212 case 7: index = context->Edi; break;
213 }
214 }
215
216 switch(rm)
217 {
218 case 0: base = context->Eax; seg = context->SegDs; break;
219 case 1: base = context->Ecx; seg = context->SegDs; break;
220 case 2: base = context->Edx; seg = context->SegDs; break;
221 case 3: base = context->Ebx; seg = context->SegDs; break;
222 case 4: base = context->Esp; seg = context->SegSs; break;
223 case 5: base = context->Ebp; seg = context->SegSs; break;
224 case 6: base = context->Esi; seg = context->SegDs; break;
225 case 7: base = context->Edi; seg = context->SegDs; break;
226 }
227 switch (mod)
228 {
229 case 0:
230 if (rm == 5) /* special case: ds:(disp32) */
231 {
232 GET_VAL( &base, DWORD );
233 seg = context->SegDs;
234 }
235 break;
236
237 case 1: /* 8-bit disp */
238 GET_VAL( &off, BYTE );
239 base += (signed char)off;
240 break;
241
242 case 2: /* 32-bit disp */
243 GET_VAL( &off, DWORD );
244 base += (signed long)off;
245 break;
246 }
247 }
248 else /* short address */
249 {
250 switch(rm)
251 {
252 case 0: /* ds:(bx,si) */
253 base = LOWORD(context->Ebx) + LOWORD(context->Esi);
254 seg = context->SegDs;
255 break;
256 case 1: /* ds:(bx,di) */
257 base = LOWORD(context->Ebx) + LOWORD(context->Edi);
258 seg = context->SegDs;
259 break;
260 case 2: /* ss:(bp,si) */
261 base = LOWORD(context->Ebp) + LOWORD(context->Esi);
262 seg = context->SegSs;
263 break;
264 case 3: /* ss:(bp,di) */
265 base = LOWORD(context->Ebp) + LOWORD(context->Edi);
266 seg = context->SegSs;
267 break;
268 case 4: /* ds:(si) */
269 base = LOWORD(context->Esi);
270 seg = context->SegDs;
271 break;
272 case 5: /* ds:(di) */
273 base = LOWORD(context->Edi);
274 seg = context->SegDs;
275 break;
276 case 6: /* ss:(bp) */
277 base = LOWORD(context->Ebp);
278 seg = context->SegSs;
279 break;
280 case 7: /* ds:(bx) */
281 base = LOWORD(context->Ebx);
282 seg = context->SegDs;
283 break;
284 }
285
286 switch(mod)
287 {
288 case 0:
289 if (rm == 6) /* special case: ds:(disp16) */
290 {
291 GET_VAL( &base, WORD );
292 seg = context->SegDs;
293 }
294 break;
295
296 case 1: /* 8-bit disp */
297 GET_VAL( &off, BYTE );
298 base += (signed char)off;
299 break;
300
301 case 2: /* 16-bit disp */
302 GET_VAL( &off, WORD );
303 base += (signed short)off;
304 break;
305 }
306 base &= 0xffff;
307 }
308 if (segprefix != -1) seg = segprefix;
309
310 /* Make sure the segment and offset are valid */
311 if (wine_ldt_is_system(seg)) return (BYTE *)(base + (index << ss));
312 if ((seg & 7) != 7) return NULL;
313 wine_ldt_get_entry( seg, &entry );
314 if (wine_ldt_is_empty( &entry )) return NULL;
315 if (wine_ldt_get_limit(&entry) < (base + (index << ss))) return NULL;
316 return (BYTE *)wine_ldt_get_base(&entry) + base + (index << ss);
317 #undef GET_VAL
318 }
319
320
321 /***********************************************************************
322 * INSTR_EmulateLDS
323 *
324 * Emulate the LDS (and LES,LFS,etc.) instruction.
325 */
326 static BOOL INSTR_EmulateLDS( CONTEXT86 *context, BYTE *instr, int long_op,
327 int long_addr, int segprefix, int *len )
328 {
329 WORD seg;
330 BYTE *regmodrm = instr + 1 + (*instr == 0x0f);
331 BYTE *addr = INSTR_GetOperandAddr( context, regmodrm,
332 long_addr, segprefix, len );
333 if (!addr)
334 return FALSE; /* Unable to emulate it */
335 seg = *(WORD *)(addr + (long_op ? 4 : 2));
336
337 if (!INSTR_ReplaceSelector( context, &seg ))
338 return FALSE; /* Unable to emulate it */
339
340 /* Now store the offset in the correct register */
341
342 store_reg( context, *regmodrm, addr, long_op );
343
344 /* Store the correct segment in the segment register */
345
346 switch(*instr)
347 {
348 case 0xc4: context->SegEs = seg; break; /* les */
349 case 0xc5: context->SegDs = seg; break; /* lds */
350 case 0x0f: switch(instr[1])
351 {
352 case 0xb2: context->SegSs = seg; break; /* lss */
353 case 0xb4: context->SegFs = seg; break; /* lfs */
354 case 0xb5: context->SegGs = seg; break; /* lgs */
355 }
356 break;
357 }
358
359 /* Add the opcode size to the total length */
360
361 *len += 1 + (*instr == 0x0f);
362 return TRUE;
363 }
364
365 /***********************************************************************
366 * INSTR_inport
367 *
368 * input on an I/O port
369 */
370 static DWORD INSTR_inport( WORD port, int size, CONTEXT86 *context )
371 {
372 DWORD res = ~0U;
373
374 if (!winedos.inport) load_winedos();
375 if (winedos.inport) res = winedos.inport( port, size );
376
377 if (TRACE_ON(io))
378 {
379 switch(size)
380 {
381 case 1:
382 TRACE_(io)( "0x%x < %02x @ %04x:%04x\n", port, LOBYTE(res),
383 (WORD)context->SegCs, LOWORD(context->Eip));
384 break;
385 case 2:
386 TRACE_(io)( "0x%x < %04x @ %04x:%04x\n", port, LOWORD(res),
387 (WORD)context->SegCs, LOWORD(context->Eip));
388 break;
389 case 4:
390 TRACE_(io)( "0x%x < %08x @ %04x:%04x\n", port, res,
391 (WORD)context->SegCs, LOWORD(context->Eip));
392 break;
393 }
394 }
395 return res;
396 }
397
398
399 /***********************************************************************
400 * INSTR_outport
401 *
402 * output on an I/O port
403 */
404 static void INSTR_outport( WORD port, int size, DWORD val, CONTEXT86 *context )
405 {
406 if (!winedos.outport) load_winedos();
407 if (winedos.outport) winedos.outport( port, size, val );
408
409 if (TRACE_ON(io))
410 {
411 switch(size)
412 {
413 case 1:
414 TRACE_(io)("0x%x > %02x @ %04x:%04x\n", port, LOBYTE(val),
415 (WORD)context->SegCs, LOWORD(context->Eip));
416 break;
417 case 2:
418 TRACE_(io)("0x%x > %04x @ %04x:%04x\n", port, LOWORD(val),
419 (WORD)context->SegCs, LOWORD(context->Eip));
420 break;
421 case 4:
422 TRACE_(io)("0x%x > %08x @ %04x:%04x\n", port, val,
423 (WORD)context->SegCs, LOWORD(context->Eip));
424 break;
425 }
426 }
427 }
428
429
430 /***********************************************************************
431 * __wine_emulate_instruction
432 *
433 * Emulate a privileged instruction.
434 * Returns exception continuation status.
435 */
436 DWORD __wine_emulate_instruction( EXCEPTION_RECORD *rec, CONTEXT86 *context )
437 {
438 int prefix, segprefix, prefixlen, len, repX, long_op, long_addr;
439 BYTE *instr;
440
441 long_op = long_addr = (!ISV86(context) && IS_SELECTOR_32BIT(context->SegCs));
442 instr = make_ptr( context, context->SegCs, context->Eip, TRUE );
443 if (!instr) return ExceptionContinueSearch;
444
445 /* First handle any possible prefix */
446
447 segprefix = -1; /* no prefix */
448 prefix = 1;
449 repX = 0;
450 prefixlen = 0;
451 while(prefix)
452 {
453 switch(*instr)
454 {
455 case 0x2e:
456 segprefix = context->SegCs;
457 break;
458 case 0x36:
459 segprefix = context->SegSs;
460 break;
461 case 0x3e:
462 segprefix = context->SegDs;
463 break;
464 case 0x26:
465 segprefix = context->SegEs;
466 break;
467 case 0x64:
468 segprefix = context->SegFs;
469 break;
470 case 0x65:
471 segprefix = context->SegGs;
472 break;
473 case 0x66:
474 long_op = !long_op; /* opcode size prefix */
475 break;
476 case 0x67:
477 long_addr = !long_addr; /* addr size prefix */
478 break;
479 case 0xf0: /* lock */
480 break;
481 case 0xf2: /* repne */
482 repX = 1;
483 break;
484 case 0xf3: /* repe */
485 repX = 2;
486 break;
487 default:
488 prefix = 0; /* no more prefixes */
489 break;
490 }
491 if (prefix)
492 {
493 instr++;
494 prefixlen++;
495 }
496 }
497
498 /* Now look at the actual instruction */
499
500 switch(*instr)
501 {
502 case 0x07: /* pop es */
503 case 0x17: /* pop ss */
504 case 0x1f: /* pop ds */
505 {
506 WORD seg = *(WORD *)get_stack( context );
507 if (INSTR_ReplaceSelector( context, &seg ))
508 {
509 switch(*instr)
510 {
511 case 0x07: context->SegEs = seg; break;
512 case 0x17: context->SegSs = seg; break;
513 case 0x1f: context->SegDs = seg; break;
514 }
515 add_stack(context, long_op ? 4 : 2);
516 context->Eip += prefixlen + 1;
517 return ExceptionContinueExecution;
518 }
519 }
520 break; /* Unable to emulate it */
521
522 case 0x0f: /* extended instruction */
523 switch(instr[1])
524 {
525 case 0x22: /* mov eax, crX */
526 switch (instr[2])
527 {
528 case 0xc0:
529 ERR("mov eax,cr0 at 0x%08x, EAX=0x%08x\n",
530 context->Eip,context->Eax );
531 context->Eip += prefixlen+3;
532 return ExceptionContinueExecution;
533 default:
534 break; /*fallthrough to bad instruction handling */
535 }
536 break; /*fallthrough to bad instruction handling */
537 case 0x20: /* mov crX, eax */
538 switch (instr[2])
539 {
540 case 0xe0: /* mov cr4, eax */
541 /* CR4 register . See linux/arch/i386/mm/init.c, X86_CR4_ defs
542 * bit 0: VME Virtual Mode Exception ?
543 * bit 1: PVI Protected mode Virtual Interrupt
544 * bit 2: TSD Timestamp disable
545 * bit 3: DE Debugging extensions
546 * bit 4: PSE Page size extensions
547 * bit 5: PAE Physical address extension
548 * bit 6: MCE Machine check enable
549 * bit 7: PGE Enable global pages
550 * bit 8: PCE Enable performance counters at IPL3
551 */
552 ERR("mov cr4,eax at 0x%08x\n",context->Eip);
553 context->Eax = 0;
554 context->Eip += prefixlen+3;
555 return ExceptionContinueExecution;
556 case 0xc0: /* mov cr0, eax */
557 ERR("mov cr0,eax at 0x%08x\n",context->Eip);
558 context->Eax = 0x10; /* FIXME: set more bits ? */
559 context->Eip += prefixlen+3;
560 return ExceptionContinueExecution;
561 default: /* fallthrough to illegal instruction */
562 break;
563 }
564 /* fallthrough to illegal instruction */
565 break;
566 case 0x21: /* mov drX, eax */
567 switch (instr[2])
568 {
569 case 0xc8: /* mov dr1, eax */
570 TRACE("mov dr1,eax at 0x%08x\n",context->Eip);
571 context->Eax = context->Dr1;
572 context->Eip += prefixlen+3;
573 return ExceptionContinueExecution;
574 case 0xf8: /* mov dr7, eax */
575 TRACE("mov dr7,eax at 0x%08x\n",context->Eip);
576 context->Eax = 0x400;
577 context->Eip += prefixlen+3;
578 return ExceptionContinueExecution;
579 }
580 ERR("Unsupported DR register, eip+2 is %02x\n", instr[2]);
581 /* fallthrough to illegal instruction */
582 break;
583 case 0x23: /* mov eax drX */
584 switch (instr[2])
585 {
586 case 0xc8: /* mov eax, dr1 */
587 context->Dr1 = context->Eax;
588 context->Eip += prefixlen+3;
589 return ExceptionContinueExecution;
590 }
591 ERR("Unsupported DR register, eip+2 is %02x\n", instr[2]);
592 /* fallthrough to illegal instruction */
593 break;
594 case 0xa1: /* pop fs */
595 {
596 WORD seg = *(WORD *)get_stack( context );
597 if (INSTR_ReplaceSelector( context, &seg ))
598 {
599 context->SegFs = seg;
600 add_stack(context, long_op ? 4 : 2);
601 context->Eip += prefixlen + 2;
602 return ExceptionContinueExecution;
603 }
604 }
605 break;
606 case 0xa9: /* pop gs */
607 {
608 WORD seg = *(WORD *)get_stack( context );
609 if (INSTR_ReplaceSelector( context, &seg ))
610 {
611 context->SegGs = seg;
612 add_stack(context, long_op ? 4 : 2);
613 context->Eip += prefixlen + 2;
614 return ExceptionContinueExecution;
615 }
616 }
617 break;
618 case 0xb2: /* lss addr,reg */
619 case 0xb4: /* lfs addr,reg */
620 case 0xb5: /* lgs addr,reg */
621 if (INSTR_EmulateLDS( context, instr, long_op,
622 long_addr, segprefix, &len ))
623 {
624 context->Eip += prefixlen + len;
625 return ExceptionContinueExecution;
626 }
627 break;
628 }
629 break; /* Unable to emulate it */
630
631 case 0x6c: /* insb */
632 case 0x6d: /* insw/d */
633 case 0x6e: /* outsb */
634 case 0x6f: /* outsw/d */
635 {
636 int typ = *instr; /* Just in case it's overwritten. */
637 int outp = (typ >= 0x6e);
638 unsigned long count = repX ?
639 (long_addr ? context->Ecx : LOWORD(context->Ecx)) : 1;
640 int opsize = (typ & 1) ? (long_op ? 4 : 2) : 1;
641 int step = (context->EFlags & 0x400) ? -opsize : +opsize;
642 int seg = outp ? context->SegDs : context->SegEs; /* FIXME: is this right? */
643
644 if (outp)
645 /* FIXME: Check segment is readable. */
646 ;
647 else
648 /* FIXME: Check segment is writable. */
649 ;
650
651 if (repX)
652 {
653 if (long_addr) context->Ecx = 0;
654 else SET_LOWORD(context->Ecx,0);
655 }
656
657 while (count-- > 0)
658 {
659 void *data;
660 WORD dx = LOWORD(context->Edx);
661 if (outp)
662 {
663 data = make_ptr( context, seg, context->Esi, long_addr );
664 if (long_addr) context->Esi += step;
665 else ADD_LOWORD(context->Esi,step);
666 }
667 else
668 {
669 data = make_ptr( context, seg, context->Edi, long_addr );
670 if (long_addr) context->Edi += step;
671 else ADD_LOWORD(context->Edi,step);
672 }
673
674 switch (typ)
675 {
676 case 0x6c:
677 *(BYTE *)data = INSTR_inport( dx, 1, context );
678 break;
679 case 0x6d:
680 if (long_op)
681 *(DWORD *)data = INSTR_inport( dx, 4, context );
682 else
683 *(WORD *)data = INSTR_inport( dx, 2, context );
684 break;
685 case 0x6e:
686 INSTR_outport( dx, 1, *(BYTE *)data, context );
687 break;
688 case 0x6f:
689 if (long_op)
690 INSTR_outport( dx, 4, *(DWORD *)data, context );
691 else
692 INSTR_outport( dx, 2, *(WORD *)data, context );
693 break;
694 }
695 }
696 context->Eip += prefixlen + 1;
697 }
698 return ExceptionContinueExecution;
699
700 case 0x8b: /* mov Ev, Gv */
701 {
702 BYTE *addr = INSTR_GetOperandAddr(context, instr + 1, long_addr,
703 segprefix, &len);
704 struct idtr idtr = get_idtr();
705 unsigned int offset = addr - idtr.base;
706
707 if (offset <= idtr.limit + 1 - (long_op ? 4 : 2))
708 {
709 idt[1].LimitLow = 0x100; /* FIXME */
710 idt[2].LimitLow = 0x11E; /* FIXME */
711 idt[3].LimitLow = 0x500; /* FIXME */
712 store_reg( context, instr[1], (BYTE *)idt + offset, long_op );
713 context->Eip += prefixlen + len + 1;
714 return ExceptionContinueExecution;
715 }
716 }
717 break; /* Unable to emulate it */
718
719 case 0x8e: /* mov XX,segment_reg */
720 {
721 WORD seg;
722 BYTE *addr = INSTR_GetOperandAddr(context, instr + 1,
723 long_addr, segprefix, &len );
724 if (!addr)
725 break; /* Unable to emulate it */
726 seg = *(WORD *)addr;
727 if (!INSTR_ReplaceSelector( context, &seg ))
728 break; /* Unable to emulate it */
729
730 switch((instr[1] >> 3) & 7)
731 {
732 case 0:
733 context->SegEs = seg;
734 context->Eip += prefixlen + len + 1;
735 return ExceptionContinueExecution;
736 case 1: /* cs */
737 break;
738 case 2:
739 context->SegSs = seg;
740 context->Eip += prefixlen + len + 1;
741 return ExceptionContinueExecution;
742 case 3:
743 context->SegDs = seg;
744 context->Eip += prefixlen + len + 1;
745 return ExceptionContinueExecution;
746 case 4:
747 context->SegFs = seg;
748 context->Eip += prefixlen + len + 1;
749 return ExceptionContinueExecution;
750 case 5:
751 context->SegGs = seg;
752 context->Eip += prefixlen + len + 1;
753 return ExceptionContinueExecution;
754 case 6: /* unused */
755 case 7: /* unused */
756 break;
757 }
758 }
759 break; /* Unable to emulate it */
760
761 case 0xc4: /* les addr,reg */
762 case 0xc5: /* lds addr,reg */
763 if (INSTR_EmulateLDS( context, instr, long_op,
764 long_addr, segprefix, &len ))
765 {
766 context->Eip += prefixlen + len;
767 return ExceptionContinueExecution;
768 }
769 break; /* Unable to emulate it */
770
771 case 0xcd: /* int <XX> */
772 if (!winedos.EmulateInterruptPM) load_winedos();
773 if (winedos.EmulateInterruptPM)
774 {
775 context->Eip += prefixlen + 2;
776 if (winedos.EmulateInterruptPM( context, instr[1] )) return ExceptionContinueExecution;
777 context->Eip -= prefixlen + 2; /* restore eip */
778 }
779 break; /* Unable to emulate it */
780
781 case 0xcf: /* iret */
782 if (wine_ldt_is_system(context->SegCs)) break; /* don't emulate it in 32-bit code */
783 if (long_op)
784 {
785 DWORD *stack = get_stack( context );
786 context->Eip = *stack++;
787 context->SegCs = *stack++;
788 context->EFlags = *stack;
789 add_stack(context, 3*sizeof(DWORD)); /* Pop the return address and flags */
790 }
791 else
792 {
793 WORD *stack = get_stack( context );
794 context->Eip = *stack++;
795 context->SegCs = *stack++;
796 SET_LOWORD(context->EFlags,*stack);
797 add_stack(context, 3*sizeof(WORD)); /* Pop the return address and flags */
798 }
799 return ExceptionContinueExecution;
800
801 case 0xe4: /* inb al,XX */
802 SET_LOBYTE(context->Eax,INSTR_inport( instr[1], 1, context ));
803 context->Eip += prefixlen + 2;
804 return ExceptionContinueExecution;
805
806 case 0xe5: /* in (e)ax,XX */
807 if (long_op)
808 context->Eax = INSTR_inport( instr[1], 4, context );
809 else
810 SET_LOWORD(context->Eax, INSTR_inport( instr[1], 2, context ));
811 context->Eip += prefixlen + 2;
812 return ExceptionContinueExecution;
813
814 case 0xe6: /* outb XX,al */
815 INSTR_outport( instr[1], 1, LOBYTE(context->Eax), context );
816 context->Eip += prefixlen + 2;
817 return ExceptionContinueExecution;
818
819 case 0xe7: /* out XX,(e)ax */
820 if (long_op)
821 INSTR_outport( instr[1], 4, context->Eax, context );
822 else
823 INSTR_outport( instr[1], 2, LOWORD(context->Eax), context );
824 context->Eip += prefixlen + 2;
825 return ExceptionContinueExecution;
826
827 case 0xec: /* inb al,dx */
828 SET_LOBYTE(context->Eax, INSTR_inport( LOWORD(context->Edx), 1, context ) );
829 context->Eip += prefixlen + 1;
830 return ExceptionContinueExecution;
831
832 case 0xed: /* in (e)ax,dx */
833 if (long_op)
834 context->Eax = INSTR_inport( LOWORD(context->Edx), 4, context );
835 else
836 SET_LOWORD(context->Eax, INSTR_inport( LOWORD(context->Edx), 2, context ));
837 context->Eip += prefixlen + 1;
838 return ExceptionContinueExecution;
839
840 case 0xee: /* outb dx,al */
841 INSTR_outport( LOWORD(context->Edx), 1, LOBYTE(context->Eax), context );
842 context->Eip += prefixlen + 1;
843 return ExceptionContinueExecution;
844
845 case 0xef: /* out dx,(e)ax */
846 if (long_op)
847 INSTR_outport( LOWORD(context->Edx), 4, context->Eax, context );
848 else
849 INSTR_outport( LOWORD(context->Edx), 2, LOWORD(context->Eax), context );
850 context->Eip += prefixlen + 1;
851 return ExceptionContinueExecution;
852
853 case 0xfa: /* cli */
854 get_vm86_teb_info()->dpmi_vif = 0;
855 context->Eip += prefixlen + 1;
856 return ExceptionContinueExecution;
857
858 case 0xfb: /* sti */
859 get_vm86_teb_info()->dpmi_vif = 1;
860 context->Eip += prefixlen + 1;
861 if (get_vm86_teb_info()->vm86_pending)
862 {
863 get_vm86_teb_info()->vm86_pending = 0;
864 rec->ExceptionCode = EXCEPTION_VM86_STI;
865 break; /* Handle the pending event. */
866 }
867 return ExceptionContinueExecution;
868 }
869 return ExceptionContinueSearch; /* Unable to emulate it */
870 }
871
872
873 /***********************************************************************
874 * INSTR_vectored_handler
875 *
876 * Vectored exception handler used to emulate protected instructions
877 * from 32-bit code.
878 */
879 LONG CALLBACK INSTR_vectored_handler( EXCEPTION_POINTERS *ptrs )
880 {
881 EXCEPTION_RECORD *record = ptrs->ExceptionRecord;
882 CONTEXT86 *context = ptrs->ContextRecord;
883
884 if (wine_ldt_is_system(context->SegCs) &&
885 (record->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
886 record->ExceptionCode == EXCEPTION_PRIV_INSTRUCTION))
887 {
888 if (__wine_emulate_instruction( record, context ) == ExceptionContinueExecution)
889 return EXCEPTION_CONTINUE_EXECUTION;
890 }
891 return EXCEPTION_CONTINUE_SEARCH;
892 }
893
894
895 /***********************************************************************
896 * INSTR_CallBuiltinHandler
897 */
898 static void INSTR_CallBuiltinHandler( CONTEXT86 *context, BYTE intnum )
899 {
900 if (!winedos.CallBuiltinHandler) load_winedos();
901 if (winedos.CallBuiltinHandler) winedos.CallBuiltinHandler( context, intnum );
902 }
903
904
905 /***********************************************************************
906 * DOS3Call (KERNEL.102)
907 */
908 void WINAPI DOS3Call( CONTEXT86 *context )
909 {
910 INSTR_CallBuiltinHandler( context, 0x21 );
911 }
912
913
914 /***********************************************************************
915 * NetBIOSCall (KERNEL.103)
916 */
917 void WINAPI NetBIOSCall16( CONTEXT86 *context )
918 {
919 INSTR_CallBuiltinHandler( context, 0x5c );
920 }
921
922
923 /***********************************************************************
924 * GetSetKernelDOSProc (KERNEL.311)
925 */
926 FARPROC16 WINAPI GetSetKernelDOSProc16( FARPROC16 DosProc )
927 {
928 FIXME("(DosProc=%p): stub\n", DosProc);
929 return NULL;
930 }