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Moved 16-bit calls initialization and exception handling to kernel32.
[wine/multimedia.git] / memory / instr.c
blob219be5e539203b9d3f68016d7567c6be613b89d6
1 /*
2 * Emulation of privileged instructions
3 *
4 * Copyright 1995 Alexandre Julliard
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #include "windef.h"
22 #include "wingdi.h"
23 #include "wine/winuser16.h"
24 #include "module.h"
25 #include "miscemu.h"
26 #include "selectors.h"
27 #include "wine/debug.h"
28 #include "callback.h"
29 #include "thread.h"
30 #include "wine/exception.h"
31
32 WINE_DEFAULT_DEBUG_CHANNEL(int);
33 WINE_DECLARE_DEBUG_CHANNEL(io);
34
35 #ifdef __i386__
36
37 /* macros to set parts of a DWORD */
38 #define SET_LOWORD(dw,val) ((dw) = ((dw) & 0xffff0000) | LOWORD(val))
39 #define SET_LOBYTE(dw,val) ((dw) = ((dw) & 0xffffff00) | LOBYTE(val))
40 #define ADD_LOWORD(dw,val) ((dw) = ((dw) & 0xffff0000) | LOWORD((DWORD)(dw)+(val)))
41
42 inline static void add_stack( CONTEXT86 *context, int offset )
43 {
44 if (ISV86(context) || !IS_SELECTOR_32BIT(context->SegSs))
45 ADD_LOWORD( context->Esp, offset );
46 else
47 context->Esp += offset;
48 }
49
50 inline static void *make_ptr( CONTEXT86 *context, DWORD seg, DWORD off, int long_addr )
51 {
52 if (ISV86(context)) return PTR_REAL_TO_LIN( seg, off );
53 if (IS_SELECTOR_SYSTEM(seg)) return (void *)off;
54 if (!long_addr) off = LOWORD(off);
55 return (char *) MapSL( MAKESEGPTR( seg, 0 ) ) + off;
56 }
57
58 inline static void *get_stack( CONTEXT86 *context )
59 {
60 if (ISV86(context)) return PTR_REAL_TO_LIN( context->SegSs, context->Esp );
61 return wine_ldt_get_ptr( context->SegSs, context->Esp );
62 }
63
64
65 /***********************************************************************
66 * timer_thread
67 */
68 static DWORD CALLBACK timer_thread( void *dummy )
69 {
70 for (;;)
71 {
72 Sleep(55);
73 DOSMEM_Tick( 0 );
74 }
75 }
76
77 /***********************************************************************
78 * INSTR_ReplaceSelector
79 *
80 * Try to replace an invalid selector by a valid one.
81 * The only selector where it is allowed to do "mov ax,40;mov es,ax"
82 * is the so called 'bimodal' selector 0x40, which points to the BIOS
83 * data segment. Used by (at least) Borland products (and programs compiled
84 * using Borland products).
85 *
86 * See Undocumented Windows, Chapter 5, __0040.
87 */
88 static BOOL INSTR_ReplaceSelector( CONTEXT86 *context, WORD *sel )
89 {
90 extern char Call16_Start, Call16_End;
91
92 if (IS_SELECTOR_SYSTEM(context->SegCs))
93 if ( (char *)context->Eip >= &Call16_Start
94 && (char *)context->Eip < &Call16_End )
95 {
96 /* Saved selector may have become invalid when the relay code */
97 /* tries to restore it. We simply clear it. */
98 *sel = 0;
99 return TRUE;
100 }
101
102 if (*sel == 0x40)
103 {
104 #if 0 /* hack until this is moved to kernel */
105 static WORD sys_timer = 0;
106 if (!sys_timer)
107 sys_timer = CreateSystemTimer( 55, DOSMEM_Tick );
108 #endif
109 static HANDLE sys_thread;
110 if (!sys_thread) sys_thread = CreateThread( NULL, 0, timer_thread, NULL, 0, NULL );
111 *sel = DOSMEM_BiosDataSeg;
112 return TRUE;
113 }
114 return FALSE; /* Can't replace selector, crashdump */
115 }
116
117
118 /***********************************************************************
119 * INSTR_GetOperandAddr
120 *
121 * Return the address of an instruction operand (from the mod/rm byte).
122 */
123 static BYTE *INSTR_GetOperandAddr( CONTEXT86 *context, BYTE *instr,
124 int long_addr, int segprefix, int *len )
125 {
126 int mod, rm, base, index = 0, ss = 0, seg = 0, off;
127 LDT_ENTRY entry;
128
129 #define GET_VAL(val,type) \
130 { *val = *(type *)instr; instr += sizeof(type); *len += sizeof(type); }
131
132 *len = 0;
133 GET_VAL( &mod, BYTE );
134 rm = mod & 7;
135 mod >>= 6;
136
137 if (mod == 3)
138 {
139 switch(rm)
140 {
141 case 0: return (BYTE *)&context->Eax;
142 case 1: return (BYTE *)&context->Ecx;
143 case 2: return (BYTE *)&context->Edx;
144 case 3: return (BYTE *)&context->Ebx;
145 case 4: return (BYTE *)&context->Esp;
146 case 5: return (BYTE *)&context->Ebp;
147 case 6: return (BYTE *)&context->Esi;
148 case 7: return (BYTE *)&context->Edi;
149 }
150 }
151
152 if (long_addr)
153 {
154 if (rm == 4)
155 {
156 BYTE sib;
157 GET_VAL( &sib, BYTE );
158 rm = sib & 7;
159 ss = sib >> 6;
160 switch(sib >> 3)
161 {
162 case 0: index = context->Eax; break;
163 case 1: index = context->Ecx; break;
164 case 2: index = context->Edx; break;
165 case 3: index = context->Ebx; break;
166 case 4: index = 0; break;
167 case 5: index = context->Ebp; break;
168 case 6: index = context->Esi; break;
169 case 7: index = context->Edi; break;
170 }
171 }
172
173 switch(rm)
174 {
175 case 0: base = context->Eax; seg = context->SegDs; break;
176 case 1: base = context->Ecx; seg = context->SegDs; break;
177 case 2: base = context->Edx; seg = context->SegDs; break;
178 case 3: base = context->Ebx; seg = context->SegDs; break;
179 case 4: base = context->Esp; seg = context->SegSs; break;
180 case 5: base = context->Ebp; seg = context->SegSs; break;
181 case 6: base = context->Esi; seg = context->SegDs; break;
182 case 7: base = context->Edi; seg = context->SegDs; break;
183 }
184 switch (mod)
185 {
186 case 0:
187 if (rm == 5) /* special case: ds:(disp32) */
188 {
189 GET_VAL( &base, DWORD );
190 seg = context->SegDs;
191 }
192 break;
193
194 case 1: /* 8-bit disp */
195 GET_VAL( &off, BYTE );
196 base += (signed char)off;
197 break;
198
199 case 2: /* 32-bit disp */
200 GET_VAL( &off, DWORD );
201 base += (signed long)off;
202 break;
203 }
204 }
205 else /* short address */
206 {
207 switch(rm)
208 {
209 case 0: /* ds:(bx,si) */
210 base = LOWORD(context->Ebx) + LOWORD(context->Esi);
211 seg = context->SegDs;
212 break;
213 case 1: /* ds:(bx,di) */
214 base = LOWORD(context->Ebx) + LOWORD(context->Edi);
215 seg = context->SegDs;
216 break;
217 case 2: /* ss:(bp,si) */
218 base = LOWORD(context->Ebp) + LOWORD(context->Esi);
219 seg = context->SegSs;
220 break;
221 case 3: /* ss:(bp,di) */
222 base = LOWORD(context->Ebp) + LOWORD(context->Edi);
223 seg = context->SegSs;
224 break;
225 case 4: /* ds:(si) */
226 base = LOWORD(context->Esi);
227 seg = context->SegDs;
228 break;
229 case 5: /* ds:(di) */
230 base = LOWORD(context->Edi);
231 seg = context->SegDs;
232 break;
233 case 6: /* ss:(bp) */
234 base = LOWORD(context->Ebp);
235 seg = context->SegSs;
236 break;
237 case 7: /* ds:(bx) */
238 base = LOWORD(context->Ebx);
239 seg = context->SegDs;
240 break;
241 }
242
243 switch(mod)
244 {
245 case 0:
246 if (rm == 6) /* special case: ds:(disp16) */
247 {
248 GET_VAL( &base, WORD );
249 seg = context->SegDs;
250 }
251 break;
252
253 case 1: /* 8-bit disp */
254 GET_VAL( &off, BYTE );
255 base += (signed char)off;
256 break;
257
258 case 2: /* 16-bit disp */
259 GET_VAL( &off, WORD );
260 base += (signed short)off;
261 break;
262 }
263 base &= 0xffff;
264 }
265 if (segprefix != -1) seg = segprefix;
266
267 /* Make sure the segment and offset are valid */
268 if (IS_SELECTOR_SYSTEM(seg)) return (BYTE *)(base + (index << ss));
269 if ((seg & 7) != 7) return NULL;
270 wine_ldt_get_entry( seg, &entry );
271 if (wine_ldt_is_empty( &entry )) return NULL;
272 if (wine_ldt_get_limit(&entry) < (base + (index << ss))) return NULL;
273 return (char *)wine_ldt_get_base(&entry) + base + (index << ss);
274 #undef GET_VAL
275 }
276
277
278 /***********************************************************************
279 * INSTR_EmulateLDS
280 *
281 * Emulate the LDS (and LES,LFS,etc.) instruction.
282 */
283 static BOOL INSTR_EmulateLDS( CONTEXT86 *context, BYTE *instr, int long_op,
284 int long_addr, int segprefix, int *len )
285 {
286 WORD seg;
287 BYTE *regmodrm = instr + 1 + (*instr == 0x0f);
288 BYTE *addr = INSTR_GetOperandAddr( context, regmodrm,
289 long_addr, segprefix, len );
290 if (!addr)
291 return FALSE; /* Unable to emulate it */
292 seg = *(WORD *)(addr + (long_op ? 4 : 2));
293
294 if (!INSTR_ReplaceSelector( context, &seg ))
295 return FALSE; /* Unable to emulate it */
296
297 /* Now store the offset in the correct register */
298
299 switch((*regmodrm >> 3) & 7)
300 {
301 case 0:
302 if (long_op) context->Eax = *(DWORD *)addr;
303 else SET_LOWORD(context->Eax,*(WORD *)addr);
304 break;
305 case 1:
306 if (long_op) context->Ecx = *(DWORD *)addr;
307 else SET_LOWORD(context->Ecx,*(WORD *)addr);
308 break;
309 case 2:
310 if (long_op) context->Edx = *(DWORD *)addr;
311 else SET_LOWORD(context->Edx,*(WORD *)addr);
312 break;
313 case 3:
314 if (long_op) context->Ebx = *(DWORD *)addr;
315 else SET_LOWORD(context->Ebx,*(WORD *)addr);
316 break;
317 case 4:
318 if (long_op) context->Esp = *(DWORD *)addr;
319 else SET_LOWORD(context->Esp,*(WORD *)addr);
320 break;
321 case 5:
322 if (long_op) context->Ebp = *(DWORD *)addr;
323 else SET_LOWORD(context->Ebp,*(WORD *)addr);
324 break;
325 case 6:
326 if (long_op) context->Esi = *(DWORD *)addr;
327 else SET_LOWORD(context->Esi,*(WORD *)addr);
328 break;
329 case 7:
330 if (long_op) context->Edi = *(DWORD *)addr;
331 else SET_LOWORD(context->Edi,*(WORD *)addr);
332 break;
333 }
334
335 /* Store the correct segment in the segment register */
336
337 switch(*instr)
338 {
339 case 0xc4: context->SegEs = seg; break; /* les */
340 case 0xc5: context->SegDs = seg; break; /* lds */
341 case 0x0f: switch(instr[1])
342 {
343 case 0xb2: context->SegSs = seg; break; /* lss */
344 case 0xb4: context->SegFs = seg; break; /* lfs */
345 case 0xb5: context->SegGs = seg; break; /* lgs */
346 }
347 break;
348 }
349
350 /* Add the opcode size to the total length */
351
352 *len += 1 + (*instr == 0x0f);
353 return TRUE;
354 }
355
356 /***********************************************************************
357 * INSTR_inport
358 *
359 * input on a I/O port
360 */
361 static DWORD INSTR_inport( WORD port, int size, CONTEXT86 *context )
362 {
363 DWORD res = IO_inport( port, size );
364 if (TRACE_ON(io))
365 {
366 switch(size)
367 {
368 case 1:
369 DPRINTF( "0x%x < %02x @ %04x:%04x\n", port, LOBYTE(res),
370 (WORD)context->SegCs, LOWORD(context->Eip));
371 break;
372 case 2:
373 DPRINTF( "0x%x < %04x @ %04x:%04x\n", port, LOWORD(res),
374 (WORD)context->SegCs, LOWORD(context->Eip));
375 break;
376 case 4:
377 DPRINTF( "0x%x < %08lx @ %04x:%04x\n", port, res,
378 (WORD)context->SegCs, LOWORD(context->Eip));
379 break;
380 }
381 }
382 return res;
383 }
384
385
386 /***********************************************************************
387 * INSTR_outport
388 *
389 * output on a I/O port
390 */
391 static void INSTR_outport( WORD port, int size, DWORD val, CONTEXT86 *context )
392 {
393 IO_outport( port, size, val );
394 if (TRACE_ON(io))
395 {
396 switch(size)
397 {
398 case 1:
399 DPRINTF("0x%x > %02x @ %04x:%04x\n", port, LOBYTE(val),
400 (WORD)context->SegCs, LOWORD(context->Eip));
401 break;
402 case 2:
403 DPRINTF("0x%x > %04x @ %04x:%04x\n", port, LOWORD(val),
404 (WORD)context->SegCs, LOWORD(context->Eip));
405 break;
406 case 4:
407 DPRINTF("0x%x > %08lx @ %04x:%04x\n", port, val,
408 (WORD)context->SegCs, LOWORD(context->Eip));
409 break;
410 }
411 }
412 }
413
414
415 /***********************************************************************
416 * INSTR_EmulateInstruction
417 *
418 * Emulate a privileged instruction.
419 * Returns exception code, or 0 if emulation successful.
420 */
421 DWORD INSTR_EmulateInstruction( CONTEXT86 *context )
422 {
423 int prefix, segprefix, prefixlen, len, repX, long_op, long_addr;
424 BYTE *instr;
425 DWORD ret = EXCEPTION_PRIV_INSTRUCTION;
426
427 long_op = long_addr = (!ISV86(context) && IS_SELECTOR_32BIT(context->SegCs));
428 instr = make_ptr( context, context->SegCs, context->Eip, TRUE );
429 if (!instr) return ret;
430
431 /* First handle any possible prefix */
432
433 segprefix = -1; /* no prefix */
434 prefix = 1;
435 repX = 0;
436 prefixlen = 0;
437 while(prefix)
438 {
439 switch(*instr)
440 {
441 case 0x2e:
442 segprefix = context->SegCs;
443 break;
444 case 0x36:
445 segprefix = context->SegSs;
446 break;
447 case 0x3e:
448 segprefix = context->SegDs;
449 break;
450 case 0x26:
451 segprefix = context->SegEs;
452 break;
453 case 0x64:
454 segprefix = context->SegFs;
455 break;
456 case 0x65:
457 segprefix = context->SegGs;
458 break;
459 case 0x66:
460 long_op = !long_op; /* opcode size prefix */
461 break;
462 case 0x67:
463 long_addr = !long_addr; /* addr size prefix */
464 break;
465 case 0xf0: /* lock */
466 break;
467 case 0xf2: /* repne */
468 repX = 1;
469 break;
470 case 0xf3: /* repe */
471 repX = 2;
472 break;
473 default:
474 prefix = 0; /* no more prefixes */
475 break;
476 }
477 if (prefix)
478 {
479 instr++;
480 prefixlen++;
481 }
482 }
483
484 /* Now look at the actual instruction */
485
486 switch(*instr)
487 {
488 case 0x07: /* pop es */
489 case 0x17: /* pop ss */
490 case 0x1f: /* pop ds */
491 {
492 WORD seg = *(WORD *)get_stack( context );
493 if (INSTR_ReplaceSelector( context, &seg ))
494 {
495 switch(*instr)
496 {
497 case 0x07: context->SegEs = seg; break;
498 case 0x17: context->SegSs = seg; break;
499 case 0x1f: context->SegDs = seg; break;
500 }
501 add_stack(context, long_op ? 4 : 2);
502 context->Eip += prefixlen + 1;
503 return 0;
504 }
505 }
506 break; /* Unable to emulate it */
507
508 case 0x0f: /* extended instruction */
509 switch(instr[1])
510 {
511 case 0x22: /* mov eax, crX */
512 switch (instr[2]) {
513 case 0xc0:
514 ERR("mov eax,cr0 at 0x%08lx, EAX=0x%08lx\n",
515 context->Eip,context->Eax );
516 context->Eip += prefixlen+3;
517 return 0;
518 default:
519 break; /*fallthrough to bad instruction handling */
520 }
521 break; /*fallthrough to bad instruction handling */
522 case 0x20: /* mov crX, eax */
523 switch (instr[2]) {
524 case 0xe0: /* mov cr4, eax */
525 /* CR4 register . See linux/arch/i386/mm/init.c, X86_CR4_ defs
526 * bit 0: VME Virtual Mode Exception ?
527 * bit 1: PVI Protected mode Virtual Interrupt
528 * bit 2: TSD Timestamp disable
529 * bit 3: DE Debugging extensions
530 * bit 4: PSE Page size extensions
531 * bit 5: PAE Physical address extension
532 * bit 6: MCE Machine check enable
533 * bit 7: PGE Enable global pages
534 * bit 8: PCE Enable performance counters at IPL3
535 */
536 ERR("mov cr4,eax at 0x%08lx\n",context->Eip);
537 context->Eax = 0;
538 context->Eip += prefixlen+3;
539 return 0;
540 case 0xc0: /* mov cr0, eax */
541 ERR("mov cr0,eax at 0x%08lx\n",context->Eip);
542 context->Eax = 0x10; /* FIXME: set more bits ? */
543 context->Eip += prefixlen+3;
544 return 0;
545 default: /* fallthrough to illegal instruction */
546 break;
547 }
548 /* fallthrough to illegal instruction */
549 break;
550 case 0xa1: /* pop fs */
551 {
552 WORD seg = *(WORD *)get_stack( context );
553 if (INSTR_ReplaceSelector( context, &seg ))
554 {
555 context->SegFs = seg;
556 add_stack(context, long_op ? 4 : 2);
557 context->Eip += prefixlen + 2;
558 return 0;
559 }
560 }
561 break;
562 case 0xa9: /* pop gs */
563 {
564 WORD seg = *(WORD *)get_stack( context );
565 if (INSTR_ReplaceSelector( context, &seg ))
566 {
567 context->SegGs = seg;
568 add_stack(context, long_op ? 4 : 2);
569 context->Eip += prefixlen + 2;
570 return 0;
571 }
572 }
573 break;
574 case 0xb2: /* lss addr,reg */
575 case 0xb4: /* lfs addr,reg */
576 case 0xb5: /* lgs addr,reg */
577 if (INSTR_EmulateLDS( context, instr, long_op,
578 long_addr, segprefix, &len ))
579 {
580 context->Eip += prefixlen + len;
581 return 0;
582 }
583 break;
584 }
585 break; /* Unable to emulate it */
586
587 case 0x6c: /* insb */
588 case 0x6d: /* insw/d */
589 case 0x6e: /* outsb */
590 case 0x6f: /* outsw/d */
591 {
592 int typ = *instr; /* Just in case it's overwritten. */
593 int outp = (typ >= 0x6e);
594 unsigned long count = repX ?
595 (long_addr ? context->Ecx : LOWORD(context->Ecx)) : 1;
596 int opsize = (typ & 1) ? (long_op ? 4 : 2) : 1;
597 int step = (context->EFlags & 0x400) ? -opsize : +opsize;
598 int seg = outp ? context->SegDs : context->SegEs; /* FIXME: is this right? */
599
600 if (outp)
601 /* FIXME: Check segment readable. */
602 (void)0;
603 else
604 /* FIXME: Check segment writeable. */
605 (void)0;
606
607 if (repX)
608 {
609 if (long_addr) context->Ecx = 0;
610 else SET_LOWORD(context->Ecx,0);
611 }
612
613 while (count-- > 0)
614 {
615 void *data;
616 WORD dx = LOWORD(context->Edx);
617 if (outp)
618 {
619 data = make_ptr( context, seg, context->Esi, long_addr );
620 if (long_addr) context->Esi += step;
621 else ADD_LOWORD(context->Esi,step);
622 }
623 else
624 {
625 data = make_ptr( context, seg, context->Edi, long_addr );
626 if (long_addr) context->Edi += step;
627 else ADD_LOWORD(context->Edi,step);
628 }
629
630 switch (typ)
631 {
632 case 0x6c:
633 *(BYTE *)data = INSTR_inport( dx, 1, context );
634 break;
635 case 0x6d:
636 if (long_op)
637 *(DWORD *)data = INSTR_inport( dx, 4, context );
638 else
639 *(WORD *)data = INSTR_inport( dx, 2, context );
640 break;
641 case 0x6e:
642 INSTR_outport( dx, 1, *(BYTE *)data, context );
643 break;
644 case 0x6f:
645 if (long_op)
646 INSTR_outport( dx, 4, *(DWORD *)data, context );
647 else
648 INSTR_outport( dx, 2, *(WORD *)data, context );
649 break;
650 }
651 }
652 context->Eip += prefixlen + 1;
653 }
654 return 0;
655
656 case 0x8e: /* mov XX,segment_reg */
657 {
658 WORD seg;
659 BYTE *addr = INSTR_GetOperandAddr(context, instr + 1,
660 long_addr, segprefix, &len );
661 if (!addr)
662 break; /* Unable to emulate it */
663 seg = *(WORD *)addr;
664 if (!INSTR_ReplaceSelector( context, &seg ))
665 break; /* Unable to emulate it */
666
667 switch((instr[1] >> 3) & 7)
668 {
669 case 0:
670 context->SegEs = seg;
671 context->Eip += prefixlen + len + 1;
672 return 0;
673 case 1: /* cs */
674 break;
675 case 2:
676 context->SegSs = seg;
677 context->Eip += prefixlen + len + 1;
678 return 0;
679 case 3:
680 context->SegDs = seg;
681 context->Eip += prefixlen + len + 1;
682 return 0;
683 case 4:
684 context->SegFs = seg;
685 context->Eip += prefixlen + len + 1;
686 return 0;
687 case 5:
688 context->SegGs = seg;
689 context->Eip += prefixlen + len + 1;
690 return 0;
691 case 6: /* unused */
692 case 7: /* unused */
693 break;
694 }
695 }
696 break; /* Unable to emulate it */
697
698 case 0xc4: /* les addr,reg */
699 case 0xc5: /* lds addr,reg */
700 if (INSTR_EmulateLDS( context, instr, long_op,
701 long_addr, segprefix, &len ))
702 {
703 context->Eip += prefixlen + len;
704 return 0;
705 }
706 break; /* Unable to emulate it */
707
708 case 0xcd: /* int <XX> */
709 if (IS_SELECTOR_SYSTEM(context->SegCs))
710 {
711 /* Win32 applications cannot use interrupts */
712 ret = EXCEPTION_ACCESS_VIOLATION;
713 break;
714 }
715 else if (!Dosvm.EmulateInterruptPM && !DPMI_LoadDosSystem())
716 {
717 ERR("could not initialize interrupt handling\n");
718 }
719 else
720 {
721 context->Eip += prefixlen + 2;
722 Dosvm.EmulateInterruptPM( context, instr[1] );
723 return 0;
724 }
725 break; /* Unable to emulate it */
726
727 case 0xcf: /* iret */
728 if (long_op)
729 {
730 DWORD *stack = get_stack( context );
731 context->Eip = *stack++;
732 context->SegCs = *stack++;
733 context->EFlags = *stack;
734 add_stack(context, 3*sizeof(DWORD)); /* Pop the return address and flags */
735 }
736 else
737 {
738 WORD *stack = get_stack( context );
739 context->Eip = *stack++;
740 context->SegCs = *stack++;
741 SET_LOWORD(context->EFlags,*stack);
742 add_stack(context, 3*sizeof(WORD)); /* Pop the return address and flags */
743 }
744 return 0;
745
746 case 0xe4: /* inb al,XX */
747 SET_LOBYTE(context->Eax,INSTR_inport( instr[1], 1, context ));
748 context->Eip += prefixlen + 2;
749 return 0;
750
751 case 0xe5: /* in (e)ax,XX */
752 if (long_op)
753 context->Eax = INSTR_inport( instr[1], 4, context );
754 else
755 SET_LOWORD(context->Eax, INSTR_inport( instr[1], 2, context ));
756 context->Eip += prefixlen + 2;
757 return 0;
758
759 case 0xe6: /* outb XX,al */
760 INSTR_outport( instr[1], 1, LOBYTE(context->Eax), context );
761 context->Eip += prefixlen + 2;
762 return 0;
763
764 case 0xe7: /* out XX,(e)ax */
765 if (long_op)
766 INSTR_outport( instr[1], 4, context->Eax, context );
767 else
768 INSTR_outport( instr[1], 2, LOWORD(context->Eax), context );
769 context->Eip += prefixlen + 2;
770 return 0;
771
772 case 0xec: /* inb al,dx */
773 SET_LOBYTE(context->Eax, INSTR_inport( LOWORD(context->Edx), 1, context ) );
774 context->Eip += prefixlen + 1;
775 return 0;
776
777 case 0xed: /* in (e)ax,dx */
778 if (long_op)
779 context->Eax = INSTR_inport( LOWORD(context->Edx), 4, context );
780 else
781 SET_LOWORD(context->Eax, INSTR_inport( LOWORD(context->Edx), 2, context ));
782 context->Eip += prefixlen + 1;
783 return 0;
784
785 case 0xee: /* outb dx,al */
786 INSTR_outport( LOWORD(context->Edx), 1, LOBYTE(context->Eax), context );
787 context->Eip += prefixlen + 1;
788 return 0;
789
790 case 0xef: /* out dx,(e)ax */
791 if (long_op)
792 INSTR_outport( LOWORD(context->Edx), 4, context->Eax, context );
793 else
794 INSTR_outport( LOWORD(context->Edx), 2, LOWORD(context->Eax), context );
795 context->Eip += prefixlen + 1;
796 return 0;
797
798 case 0xfa: /* cli */
799 NtCurrentTeb()->dpmi_vif = 0;
800 context->Eip += prefixlen + 1;
801 return 0;
802
803 case 0xfb: /* sti */
804 NtCurrentTeb()->dpmi_vif = 1;
805 context->Eip += prefixlen + 1;
806 if (NtCurrentTeb()->vm86_pending)
807 {
808 NtCurrentTeb()->vm86_pending = 0;
809 return EXCEPTION_VM86_STI;
810 }
811 return 0;
812 }
813 return ret; /* Unable to emulate it */
814 }
815
816 #endif /* __i386__ */
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