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In OSS_RawOpenDevice, always retrieve the device format and store it
[wine/multimedia.git] / memory / instr.c
blobf56c4885a698bf24a8ea4d17746990af20e4acb1
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
30 WINE_DEFAULT_DEBUG_CHANNEL(int);
31 WINE_DECLARE_DEBUG_CHANNEL(io);
32
33 #ifdef __i386__
34
35 /* macros to set parts of a DWORD */
36 #define SET_LOWORD(dw,val) ((dw) = ((dw) & 0xffff0000) | LOWORD(val))
37 #define SET_LOBYTE(dw,val) ((dw) = ((dw) & 0xffffff00) | LOBYTE(val))
38 #define ADD_LOWORD(dw,val) ((dw) = ((dw) & 0xffff0000) | LOWORD((DWORD)(dw)+(val)))
39
40 inline static void add_stack( CONTEXT86 *context, int offset )
41 {
42 if (ISV86(context) || !IS_SELECTOR_32BIT(context->SegSs))
43 ADD_LOWORD( context->Esp, offset );
44 else
45 context->Esp += offset;
46 }
47
48 inline static void *make_ptr( CONTEXT86 *context, DWORD seg, DWORD off, int long_addr )
49 {
50 if (ISV86(context)) return PTR_REAL_TO_LIN( seg, off );
51 if (IS_SELECTOR_SYSTEM(seg)) return (void *)off;
52 if (!long_addr) off = LOWORD(off);
53 return (char *) MapSL( MAKESEGPTR( seg, 0 ) ) + off;
54 }
55
56 inline static void *get_stack( CONTEXT86 *context )
57 {
58 if (ISV86(context))
59 return PTR_REAL_TO_LIN( context->SegSs, context->Esp );
60 if (IS_SELECTOR_SYSTEM(context->SegSs))
61 return (void *)context->Esp;
62 if (IS_SELECTOR_32BIT(context->SegSs))
63 return (char *) MapSL( MAKESEGPTR( context->SegSs, 0 ) ) + context->Esp;
64 return MapSL( MAKESEGPTR( context->SegSs, LOWORD(context->Esp) ) );
65 }
66
67 /***********************************************************************
68 * INSTR_ReplaceSelector
69 *
70 * Try to replace an invalid selector by a valid one.
71 * The only selector where it is allowed to do "mov ax,40;mov es,ax"
72 * is the so called 'bimodal' selector 0x40, which points to the BIOS
73 * data segment. Used by (at least) Borland products (and programs compiled
74 * using Borland products).
75 *
76 * See Undocumented Windows, Chapter 5, __0040.
77 */
78 static BOOL INSTR_ReplaceSelector( CONTEXT86 *context, WORD *sel )
79 {
80 extern char Call16_Start, Call16_End;
81
82 if (IS_SELECTOR_SYSTEM(context->SegCs))
83 if ( (char *)context->Eip >= &Call16_Start
84 && (char *)context->Eip < &Call16_End )
85 {
86 /* Saved selector may have become invalid when the relay code */
87 /* tries to restore it. We simply clear it. */
88 *sel = 0;
89 return TRUE;
90 }
91
92 if (*sel == 0x40)
93 {
94 static WORD sys_timer = 0;
95 if (!sys_timer)
96 sys_timer = CreateSystemTimer( 55, DOSMEM_Tick );
97 *sel = DOSMEM_BiosDataSeg;
98 return TRUE;
99 }
100 if (!IS_SELECTOR_SYSTEM(*sel) && !IS_SELECTOR_FREE(*sel))
101 ERR("Got protection fault on valid selector, maybe your kernel is too old?\n" );
102 return FALSE; /* Can't replace selector, crashdump */
103 }
104
105
106 /***********************************************************************
107 * INSTR_GetOperandAddr
108 *
109 * Return the address of an instruction operand (from the mod/rm byte).
110 */
111 static BYTE *INSTR_GetOperandAddr( CONTEXT86 *context, BYTE *instr,
112 int long_addr, int segprefix, int *len )
113 {
114 int mod, rm, base, index = 0, ss = 0, seg = 0, off;
115
116 #define GET_VAL(val,type) \
117 { *val = *(type *)instr; instr += sizeof(type); *len += sizeof(type); }
118
119 *len = 0;
120 GET_VAL( &mod, BYTE );
121 rm = mod & 7;
122 mod >>= 6;
123
124 if (mod == 3)
125 {
126 switch(rm)
127 {
128 case 0: return (BYTE *)&context->Eax;
129 case 1: return (BYTE *)&context->Ecx;
130 case 2: return (BYTE *)&context->Edx;
131 case 3: return (BYTE *)&context->Ebx;
132 case 4: return (BYTE *)&context->Esp;
133 case 5: return (BYTE *)&context->Ebp;
134 case 6: return (BYTE *)&context->Esi;
135 case 7: return (BYTE *)&context->Edi;
136 }
137 }
138
139 if (long_addr)
140 {
141 if (rm == 4)
142 {
143 BYTE sib;
144 GET_VAL( &sib, BYTE );
145 rm = sib & 7;
146 ss = sib >> 6;
147 switch(sib >> 3)
148 {
149 case 0: index = context->Eax; break;
150 case 1: index = context->Ecx; break;
151 case 2: index = context->Edx; break;
152 case 3: index = context->Ebx; break;
153 case 4: index = 0; break;
154 case 5: index = context->Ebp; break;
155 case 6: index = context->Esi; break;
156 case 7: index = context->Edi; break;
157 }
158 }
159
160 switch(rm)
161 {
162 case 0: base = context->Eax; seg = context->SegDs; break;
163 case 1: base = context->Ecx; seg = context->SegDs; break;
164 case 2: base = context->Edx; seg = context->SegDs; break;
165 case 3: base = context->Ebx; seg = context->SegDs; break;
166 case 4: base = context->Esp; seg = context->SegSs; break;
167 case 5: base = context->Ebp; seg = context->SegSs; break;
168 case 6: base = context->Esi; seg = context->SegDs; break;
169 case 7: base = context->Edi; seg = context->SegDs; break;
170 }
171 switch (mod)
172 {
173 case 0:
174 if (rm == 5) /* special case: ds:(disp32) */
175 {
176 GET_VAL( &base, DWORD );
177 seg = context->SegDs;
178 }
179 break;
180
181 case 1: /* 8-bit disp */
182 GET_VAL( &off, BYTE );
183 base += (signed char)off;
184 break;
185
186 case 2: /* 32-bit disp */
187 GET_VAL( &off, DWORD );
188 base += (signed long)off;
189 break;
190 }
191 }
192 else /* short address */
193 {
194 switch(rm)
195 {
196 case 0: /* ds:(bx,si) */
197 base = LOWORD(context->Ebx) + LOWORD(context->Esi);
198 seg = context->SegDs;
199 break;
200 case 1: /* ds:(bx,di) */
201 base = LOWORD(context->Ebx) + LOWORD(context->Edi);
202 seg = context->SegDs;
203 break;
204 case 2: /* ss:(bp,si) */
205 base = LOWORD(context->Ebp) + LOWORD(context->Esi);
206 seg = context->SegSs;
207 break;
208 case 3: /* ss:(bp,di) */
209 base = LOWORD(context->Ebp) + LOWORD(context->Edi);
210 seg = context->SegSs;
211 break;
212 case 4: /* ds:(si) */
213 base = LOWORD(context->Esi);
214 seg = context->SegDs;
215 break;
216 case 5: /* ds:(di) */
217 base = LOWORD(context->Edi);
218 seg = context->SegDs;
219 break;
220 case 6: /* ss:(bp) */
221 base = LOWORD(context->Ebp);
222 seg = context->SegSs;
223 break;
224 case 7: /* ds:(bx) */
225 base = LOWORD(context->Ebx);
226 seg = context->SegDs;
227 break;
228 }
229
230 switch(mod)
231 {
232 case 0:
233 if (rm == 6) /* special case: ds:(disp16) */
234 {
235 GET_VAL( &base, WORD );
236 seg = context->SegDs;
237 }
238 break;
239
240 case 1: /* 8-bit disp */
241 GET_VAL( &off, BYTE );
242 base += (signed char)off;
243 break;
244
245 case 2: /* 16-bit disp */
246 GET_VAL( &off, WORD );
247 base += (signed short)off;
248 break;
249 }
250 base &= 0xffff;
251 }
252 if (segprefix != -1) seg = segprefix;
253
254 /* Make sure the segment and offset are valid */
255 if (IS_SELECTOR_SYSTEM(seg)) return (BYTE *)(base + (index << ss));
256 if (((seg & 7) != 7) || IS_SELECTOR_FREE(seg)) return NULL;
257 if (wine_ldt_copy.limit[seg >> 3] < (base + (index << ss))) return NULL;
258 return (char *) MapSL( MAKESEGPTR( seg, 0 ) ) + base + (index << ss);
259 #undef GET_VAL
260 }
261
262
263 /***********************************************************************
264 * INSTR_EmulateLDS
265 *
266 * Emulate the LDS (and LES,LFS,etc.) instruction.
267 */
268 static BOOL INSTR_EmulateLDS( CONTEXT86 *context, BYTE *instr, int long_op,
269 int long_addr, int segprefix, int *len )
270 {
271 WORD seg;
272 BYTE *regmodrm = instr + 1 + (*instr == 0x0f);
273 BYTE *addr = INSTR_GetOperandAddr( context, regmodrm,
274 long_addr, segprefix, len );
275 if (!addr)
276 return FALSE; /* Unable to emulate it */
277 seg = *(WORD *)(addr + (long_op ? 4 : 2));
278
279 if (!INSTR_ReplaceSelector( context, &seg ))
280 return FALSE; /* Unable to emulate it */
281
282 /* Now store the offset in the correct register */
283
284 switch((*regmodrm >> 3) & 7)
285 {
286 case 0:
287 if (long_op) context->Eax = *(DWORD *)addr;
288 else SET_LOWORD(context->Eax,*(WORD *)addr);
289 break;
290 case 1:
291 if (long_op) context->Ecx = *(DWORD *)addr;
292 else SET_LOWORD(context->Ecx,*(WORD *)addr);
293 break;
294 case 2:
295 if (long_op) context->Edx = *(DWORD *)addr;
296 else SET_LOWORD(context->Edx,*(WORD *)addr);
297 break;
298 case 3:
299 if (long_op) context->Ebx = *(DWORD *)addr;
300 else SET_LOWORD(context->Ebx,*(WORD *)addr);
301 break;
302 case 4:
303 if (long_op) context->Esp = *(DWORD *)addr;
304 else SET_LOWORD(context->Esp,*(WORD *)addr);
305 break;
306 case 5:
307 if (long_op) context->Ebp = *(DWORD *)addr;
308 else SET_LOWORD(context->Ebp,*(WORD *)addr);
309 break;
310 case 6:
311 if (long_op) context->Esi = *(DWORD *)addr;
312 else SET_LOWORD(context->Esi,*(WORD *)addr);
313 break;
314 case 7:
315 if (long_op) context->Edi = *(DWORD *)addr;
316 else SET_LOWORD(context->Edi,*(WORD *)addr);
317 break;
318 }
319
320 /* Store the correct segment in the segment register */
321
322 switch(*instr)
323 {
324 case 0xc4: context->SegEs = seg; break; /* les */
325 case 0xc5: context->SegDs = seg; break; /* lds */
326 case 0x0f: switch(instr[1])
327 {
328 case 0xb2: context->SegSs = seg; break; /* lss */
329 case 0xb4: context->SegFs = seg; break; /* lfs */
330 case 0xb5: context->SegGs = seg; break; /* lgs */
331 }
332 break;
333 }
334
335 /* Add the opcode size to the total length */
336
337 *len += 1 + (*instr == 0x0f);
338 return TRUE;
339 }
340
341 /***********************************************************************
342 * INSTR_inport
343 *
344 * input on a I/O port
345 */
346 static DWORD INSTR_inport( WORD port, int size, CONTEXT86 *context )
347 {
348 DWORD res = IO_inport( port, size );
349 if (TRACE_ON(io))
350 {
351 switch(size)
352 {
353 case 1:
354 DPRINTF( "0x%x < %02x @ %04x:%04x\n", port, LOBYTE(res),
355 (WORD)context->SegCs, LOWORD(context->Eip));
356 break;
357 case 2:
358 DPRINTF( "0x%x < %04x @ %04x:%04x\n", port, LOWORD(res),
359 (WORD)context->SegCs, LOWORD(context->Eip));
360 break;
361 case 4:
362 DPRINTF( "0x%x < %08lx @ %04x:%04x\n", port, res,
363 (WORD)context->SegCs, LOWORD(context->Eip));
364 break;
365 }
366 }
367 return res;
368 }
369
370
371 /***********************************************************************
372 * INSTR_outport
373 *
374 * output on a I/O port
375 */
376 static void INSTR_outport( WORD port, int size, DWORD val, CONTEXT86 *context )
377 {
378 IO_outport( port, size, val );
379 if (TRACE_ON(io))
380 {
381 switch(size)
382 {
383 case 1:
384 DPRINTF("0x%x > %02x @ %04x:%04x\n", port, LOBYTE(val),
385 (WORD)context->SegCs, LOWORD(context->Eip));
386 break;
387 case 2:
388 DPRINTF("0x%x > %04x @ %04x:%04x\n", port, LOWORD(val),
389 (WORD)context->SegCs, LOWORD(context->Eip));
390 break;
391 case 4:
392 DPRINTF("0x%x > %08lx @ %04x:%04x\n", port, val,
393 (WORD)context->SegCs, LOWORD(context->Eip));
394 break;
395 }
396 }
397 }
398
399
400 /***********************************************************************
401 * INSTR_EmulateInstruction
402 *
403 * Emulate a privileged instruction. Returns TRUE if emulation successful.
404 */
405 BOOL INSTR_EmulateInstruction( CONTEXT86 *context )
406 {
407 int prefix, segprefix, prefixlen, len, repX, long_op, long_addr;
408 SEGPTR gpHandler;
409 BYTE *instr;
410
411 long_op = long_addr = (!ISV86(context) && IS_SELECTOR_32BIT(context->SegCs));
412 instr = make_ptr( context, context->SegCs, context->Eip, TRUE );
413 if (!instr) return FALSE;
414
415 /* First handle any possible prefix */
416
417 segprefix = -1; /* no prefix */
418 prefix = 1;
419 repX = 0;
420 prefixlen = 0;
421 while(prefix)
422 {
423 switch(*instr)
424 {
425 case 0x2e:
426 segprefix = context->SegCs;
427 break;
428 case 0x36:
429 segprefix = context->SegSs;
430 break;
431 case 0x3e:
432 segprefix = context->SegDs;
433 break;
434 case 0x26:
435 segprefix = context->SegEs;
436 break;
437 case 0x64:
438 segprefix = context->SegFs;
439 break;
440 case 0x65:
441 segprefix = context->SegGs;
442 break;
443 case 0x66:
444 long_op = !long_op; /* opcode size prefix */
445 break;
446 case 0x67:
447 long_addr = !long_addr; /* addr size prefix */
448 break;
449 case 0xf0: /* lock */
450 break;
451 case 0xf2: /* repne */
452 repX = 1;
453 break;
454 case 0xf3: /* repe */
455 repX = 2;
456 break;
457 default:
458 prefix = 0; /* no more prefixes */
459 break;
460 }
461 if (prefix)
462 {
463 instr++;
464 prefixlen++;
465 }
466 }
467
468 /* Now look at the actual instruction */
469
470 switch(*instr)
471 {
472 case 0x07: /* pop es */
473 case 0x17: /* pop ss */
474 case 0x1f: /* pop ds */
475 {
476 WORD seg = *(WORD *)get_stack( context );
477 if (INSTR_ReplaceSelector( context, &seg ))
478 {
479 switch(*instr)
480 {
481 case 0x07: context->SegEs = seg; break;
482 case 0x17: context->SegSs = seg; break;
483 case 0x1f: context->SegDs = seg; break;
484 }
485 add_stack(context, long_op ? 4 : 2);
486 context->Eip += prefixlen + 1;
487 return TRUE;
488 }
489 }
490 break; /* Unable to emulate it */
491
492 case 0x0f: /* extended instruction */
493 switch(instr[1])
494 {
495 case 0x22: /* mov eax, crX */
496 switch (instr[2]) {
497 case 0xc0:
498 ERR("mov eax,cr0 at 0x%08lx, EAX=0x%08lx\n",
499 context->Eip,context->Eax );
500 context->Eip += prefixlen+3;
501 return TRUE;
502 default:
503 break; /*fallthrough to bad instruction handling */
504 }
505 break; /*fallthrough to bad instruction handling */
506 case 0x20: /* mov crX, eax */
507 switch (instr[2]) {
508 case 0xe0: /* mov cr4, eax */
509 /* CR4 register . See linux/arch/i386/mm/init.c, X86_CR4_ defs
510 * bit 0: VME Virtual Mode Exception ?
511 * bit 1: PVI Protected mode Virtual Interrupt
512 * bit 2: TSD Timestamp disable
513 * bit 3: DE Debugging extensions
514 * bit 4: PSE Page size extensions
515 * bit 5: PAE Physical address extension
516 * bit 6: MCE Machine check enable
517 * bit 7: PGE Enable global pages
518 * bit 8: PCE Enable performance counters at IPL3
519 */
520 ERR("mov cr4,eax at 0x%08lx\n",context->Eip);
521 context->Eax = 0;
522 context->Eip += prefixlen+3;
523 return TRUE;
524 case 0xc0: /* mov cr0, eax */
525 ERR("mov cr0,eax at 0x%08lx\n",context->Eip);
526 context->Eax = 0x10; /* FIXME: set more bits ? */
527 context->Eip += prefixlen+3;
528 return TRUE;
529 default: /* fallthrough to illegal instruction */
530 break;
531 }
532 /* fallthrough to illegal instruction */
533 break;
534 case 0xa1: /* pop fs */
535 {
536 WORD seg = *(WORD *)get_stack( context );
537 if (INSTR_ReplaceSelector( context, &seg ))
538 {
539 context->SegFs = seg;
540 add_stack(context, long_op ? 4 : 2);
541 context->Eip += prefixlen + 2;
542 return TRUE;
543 }
544 }
545 break;
546 case 0xa9: /* pop gs */
547 {
548 WORD seg = *(WORD *)get_stack( context );
549 if (INSTR_ReplaceSelector( context, &seg ))
550 {
551 context->SegGs = seg;
552 add_stack(context, long_op ? 4 : 2);
553 context->Eip += prefixlen + 2;
554 return TRUE;
555 }
556 }
557 break;
558 case 0xb2: /* lss addr,reg */
559 case 0xb4: /* lfs addr,reg */
560 case 0xb5: /* lgs addr,reg */
561 if (INSTR_EmulateLDS( context, instr, long_op,
562 long_addr, segprefix, &len ))
563 {
564 context->Eip += prefixlen + len;
565 return TRUE;
566 }
567 break;
568 }
569 break; /* Unable to emulate it */
570
571 case 0x6c: /* insb */
572 case 0x6d: /* insw/d */
573 case 0x6e: /* outsb */
574 case 0x6f: /* outsw/d */
575 {
576 int typ = *instr; /* Just in case it's overwritten. */
577 int outp = (typ >= 0x6e);
578 unsigned long count = repX ?
579 (long_addr ? context->Ecx : LOWORD(context->Ecx)) : 1;
580 int opsize = (typ & 1) ? (long_op ? 4 : 2) : 1;
581 int step = (context->EFlags & 0x400) ? -opsize : +opsize;
582 int seg = outp ? context->SegDs : context->SegEs; /* FIXME: is this right? */
583
584 if (outp)
585 /* FIXME: Check segment readable. */
586 (void)0;
587 else
588 /* FIXME: Check segment writeable. */
589 (void)0;
590
591 if (repX)
592 {
593 if (long_addr) context->Ecx = 0;
594 else SET_LOWORD(context->Ecx,0);
595 }
596
597 while (count-- > 0)
598 {
599 void *data;
600 WORD dx = LOWORD(context->Edx);
601 if (outp)
602 {
603 data = make_ptr( context, seg, context->Esi, long_addr );
604 if (long_addr) context->Esi += step;
605 else ADD_LOWORD(context->Esi,step);
606 }
607 else
608 {
609 data = make_ptr( context, seg, context->Edi, long_addr );
610 if (long_addr) context->Edi += step;
611 else ADD_LOWORD(context->Edi,step);
612 }
613
614 switch (typ)
615 {
616 case 0x6c:
617 *(BYTE *)data = INSTR_inport( dx, 1, context );
618 break;
619 case 0x6d:
620 if (long_op)
621 *(DWORD *)data = INSTR_inport( dx, 4, context );
622 else
623 *(WORD *)data = INSTR_inport( dx, 2, context );
624 break;
625 case 0x6e:
626 INSTR_outport( dx, 1, *(BYTE *)data, context );
627 break;
628 case 0x6f:
629 if (long_op)
630 INSTR_outport( dx, 4, *(DWORD *)data, context );
631 else
632 INSTR_outport( dx, 2, *(WORD *)data, context );
633 break;
634 }
635 }
636 context->Eip += prefixlen + 1;
637 }
638 return TRUE;
639
640 case 0x8e: /* mov XX,segment_reg */
641 {
642 WORD seg;
643 BYTE *addr = INSTR_GetOperandAddr(context, instr + 1,
644 long_addr, segprefix, &len );
645 if (!addr)
646 break; /* Unable to emulate it */
647 seg = *(WORD *)addr;
648 if (!INSTR_ReplaceSelector( context, &seg ))
649 break; /* Unable to emulate it */
650
651 switch((instr[1] >> 3) & 7)
652 {
653 case 0:
654 context->SegEs = seg;
655 context->Eip += prefixlen + len + 1;
656 return TRUE;
657 case 1: /* cs */
658 break;
659 case 2:
660 context->SegSs = seg;
661 context->Eip += prefixlen + len + 1;
662 return TRUE;
663 case 3:
664 context->SegDs = seg;
665 context->Eip += prefixlen + len + 1;
666 return TRUE;
667 case 4:
668 context->SegFs = seg;
669 context->Eip += prefixlen + len + 1;
670 return TRUE;
671 case 5:
672 context->SegGs = seg;
673 context->Eip += prefixlen + len + 1;
674 return TRUE;
675 case 6: /* unused */
676 case 7: /* unused */
677 break;
678 }
679 }
680 break; /* Unable to emulate it */
681
682 case 0xc4: /* les addr,reg */
683 case 0xc5: /* lds addr,reg */
684 if (INSTR_EmulateLDS( context, instr, long_op,
685 long_addr, segprefix, &len ))
686 {
687 context->Eip += prefixlen + len;
688 return TRUE;
689 }
690 break; /* Unable to emulate it */
691
692 case 0xcd: /* int <XX> */
693 if(!Dosvm.EmulateInterruptPM && !DPMI_LoadDosSystem())
694 ERR("could not initialize interrupt handling\n");
695 else {
696 context->Eip += prefixlen + 2;
697 Dosvm.EmulateInterruptPM( context, instr[1] );
698 return TRUE;
699 }
700 break; /* Unable to emulate it */
701
702 case 0xcf: /* iret */
703 if (long_op)
704 {
705 DWORD *stack = get_stack( context );
706 context->Eip = *stack++;
707 context->SegCs = *stack++;
708 context->EFlags = *stack;
709 add_stack(context, 3*sizeof(DWORD)); /* Pop the return address and flags */
710 }
711 else
712 {
713 WORD *stack = get_stack( context );
714 context->Eip = *stack++;
715 context->SegCs = *stack++;
716 SET_LOWORD(context->EFlags,*stack);
717 add_stack(context, 3*sizeof(WORD)); /* Pop the return address and flags */
718 }
719 return TRUE;
720
721 case 0xe4: /* inb al,XX */
722 SET_LOBYTE(context->Eax,INSTR_inport( instr[1], 1, context ));
723 context->Eip += prefixlen + 2;
724 return TRUE;
725
726 case 0xe5: /* in (e)ax,XX */
727 if (long_op)
728 context->Eax = INSTR_inport( instr[1], 4, context );
729 else
730 SET_LOWORD(context->Eax, INSTR_inport( instr[1], 2, context ));
731 context->Eip += prefixlen + 2;
732 return TRUE;
733
734 case 0xe6: /* outb XX,al */
735 INSTR_outport( instr[1], 1, LOBYTE(context->Eax), context );
736 context->Eip += prefixlen + 2;
737 return TRUE;
738
739 case 0xe7: /* out XX,(e)ax */
740 if (long_op)
741 INSTR_outport( instr[1], 4, context->Eax, context );
742 else
743 INSTR_outport( instr[1], 2, LOWORD(context->Eax), context );
744 context->Eip += prefixlen + 2;
745 return TRUE;
746
747 case 0xec: /* inb al,dx */
748 SET_LOBYTE(context->Eax, INSTR_inport( LOWORD(context->Edx), 1, context ) );
749 context->Eip += prefixlen + 1;
750 return TRUE;
751
752 case 0xed: /* in (e)ax,dx */
753 if (long_op)
754 context->Eax = INSTR_inport( LOWORD(context->Edx), 4, context );
755 else
756 SET_LOWORD(context->Eax, INSTR_inport( LOWORD(context->Edx), 2, context ));
757 context->Eip += prefixlen + 1;
758 return TRUE;
759
760 case 0xee: /* outb dx,al */
761 INSTR_outport( LOWORD(context->Edx), 1, LOBYTE(context->Eax), context );
762 context->Eip += prefixlen + 1;
763 return TRUE;
764
765 case 0xef: /* out dx,(e)ax */
766 if (long_op)
767 INSTR_outport( LOWORD(context->Edx), 4, context->Eax, context );
768 else
769 INSTR_outport( LOWORD(context->Edx), 2, LOWORD(context->Eax), context );
770 context->Eip += prefixlen + 1;
771 return TRUE;
772
773 case 0xfa: /* cli, ignored */
774 context->Eip += prefixlen + 1;
775 return TRUE;
776
777 case 0xfb: /* sti, ignored */
778 context->Eip += prefixlen + 1;
779 return TRUE;
780 }
781
782
783 /* Check for Win16 __GP handler */
784 gpHandler = HasGPHandler16( MAKESEGPTR( context->SegCs, context->Eip ) );
785 if (gpHandler)
786 {
787 WORD *stack = get_stack( context );
788 *--stack = context->SegCs;
789 *--stack = context->Eip;
790 add_stack(context, -2*sizeof(WORD));
791
792 context->SegCs = SELECTOROF( gpHandler );
793 context->Eip = OFFSETOF( gpHandler );
794 return TRUE;
795 }
796 return FALSE; /* Unable to emulate it */
797 }
798
799 #endif /* __i386__ */
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