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Added {ok,trace}_ macros to take explicit file and line number.
[wine/multimedia.git] / memory / instr.c
blobd2c93e9447e6f3704dbd73a1c89aa2be3348777a
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 inline static void add_stack( CONTEXT86 *context, int offset )
36 {
37 if (ISV86(context) || !IS_SELECTOR_32BIT(context->SegSs))
38 ADD_LOWORD( context->Esp, offset );
39 else
40 context->Esp += offset;
41 }
42
43 inline static void *make_ptr( CONTEXT86 *context, DWORD seg, DWORD off, int long_addr )
44 {
45 if (ISV86(context)) return PTR_REAL_TO_LIN( seg, off );
46 if (IS_SELECTOR_SYSTEM(seg)) return (void *)off;
47 if (!long_addr) off = LOWORD(off);
48 return (char *) MapSL( MAKESEGPTR( seg, 0 ) ) + off;
49 }
50
51 inline static void *get_stack( CONTEXT86 *context )
52 {
53 if (ISV86(context))
54 return PTR_REAL_TO_LIN( context->SegSs, context->Esp );
55 if (IS_SELECTOR_SYSTEM(context->SegSs))
56 return (void *)context->Esp;
57 if (IS_SELECTOR_32BIT(context->SegSs))
58 return (char *) MapSL( MAKESEGPTR( context->SegSs, 0 ) ) + context->Esp;
59 return MapSL( MAKESEGPTR( context->SegSs, LOWORD(context->Esp) ) );
60 }
61
62 /***********************************************************************
63 * INSTR_ReplaceSelector
64 *
65 * Try to replace an invalid selector by a valid one.
66 * The only selector where it is allowed to do "mov ax,40;mov es,ax"
67 * is the so called 'bimodal' selector 0x40, which points to the BIOS
68 * data segment. Used by (at least) Borland products (and programs compiled
69 * using Borland products).
70 *
71 * See Undocumented Windows, Chapter 5, __0040.
72 */
73 static BOOL INSTR_ReplaceSelector( CONTEXT86 *context, WORD *sel )
74 {
75 extern char Call16_Start, Call16_End;
76
77 if (IS_SELECTOR_SYSTEM(context->SegCs))
78 if ( (char *)context->Eip >= &Call16_Start
79 && (char *)context->Eip < &Call16_End )
80 {
81 /* Saved selector may have become invalid when the relay code */
82 /* tries to restore it. We simply clear it. */
83 *sel = 0;
84 return TRUE;
85 }
86
87 if (*sel == 0x40)
88 {
89 static WORD sys_timer = 0;
90 if (!sys_timer)
91 sys_timer = CreateSystemTimer( 55, DOSMEM_Tick );
92 *sel = DOSMEM_BiosDataSeg;
93 return TRUE;
94 }
95 if (!IS_SELECTOR_SYSTEM(*sel) && !IS_SELECTOR_FREE(*sel))
96 ERR("Got protection fault on valid selector, maybe your kernel is too old?\n" );
97 return FALSE; /* Can't replace selector, crashdump */
98 }
99
100
101 /***********************************************************************
102 * INSTR_GetOperandAddr
103 *
104 * Return the address of an instruction operand (from the mod/rm byte).
105 */
106 static BYTE *INSTR_GetOperandAddr( CONTEXT86 *context, BYTE *instr,
107 int long_addr, int segprefix, int *len )
108 {
109 int mod, rm, base, index = 0, ss = 0, seg = 0, off;
110
111 #define GET_VAL(val,type) \
112 { *val = *(type *)instr; instr += sizeof(type); *len += sizeof(type); }
113
114 *len = 0;
115 GET_VAL( &mod, BYTE );
116 rm = mod & 7;
117 mod >>= 6;
118
119 if (mod == 3)
120 {
121 switch(rm)
122 {
123 case 0: return (BYTE *)&context->Eax;
124 case 1: return (BYTE *)&context->Ecx;
125 case 2: return (BYTE *)&context->Edx;
126 case 3: return (BYTE *)&context->Ebx;
127 case 4: return (BYTE *)&context->Esp;
128 case 5: return (BYTE *)&context->Ebp;
129 case 6: return (BYTE *)&context->Esi;
130 case 7: return (BYTE *)&context->Edi;
131 }
132 }
133
134 if (long_addr)
135 {
136 if (rm == 4)
137 {
138 BYTE sib;
139 GET_VAL( &sib, BYTE );
140 rm = sib & 7;
141 ss = sib >> 6;
142 switch(sib >> 3)
143 {
144 case 0: index = context->Eax; break;
145 case 1: index = context->Ecx; break;
146 case 2: index = context->Edx; break;
147 case 3: index = context->Ebx; break;
148 case 4: index = 0; break;
149 case 5: index = context->Ebp; break;
150 case 6: index = context->Esi; break;
151 case 7: index = context->Edi; break;
152 }
153 }
154
155 switch(rm)
156 {
157 case 0: base = context->Eax; seg = context->SegDs; break;
158 case 1: base = context->Ecx; seg = context->SegDs; break;
159 case 2: base = context->Edx; seg = context->SegDs; break;
160 case 3: base = context->Ebx; seg = context->SegDs; break;
161 case 4: base = context->Esp; seg = context->SegSs; break;
162 case 5: base = context->Ebp; seg = context->SegSs; break;
163 case 6: base = context->Esi; seg = context->SegDs; break;
164 case 7: base = context->Edi; seg = context->SegDs; break;
165 }
166 switch (mod)
167 {
168 case 0:
169 if (rm == 5) /* special case: ds:(disp32) */
170 {
171 GET_VAL( &base, DWORD );
172 seg = context->SegDs;
173 }
174 break;
175
176 case 1: /* 8-bit disp */
177 GET_VAL( &off, BYTE );
178 base += (signed char)off;
179 break;
180
181 case 2: /* 32-bit disp */
182 GET_VAL( &off, DWORD );
183 base += (signed long)off;
184 break;
185 }
186 }
187 else /* short address */
188 {
189 switch(rm)
190 {
191 case 0: /* ds:(bx,si) */
192 base = LOWORD(context->Ebx) + LOWORD(context->Esi);
193 seg = context->SegDs;
194 break;
195 case 1: /* ds:(bx,di) */
196 base = LOWORD(context->Ebx) + LOWORD(context->Edi);
197 seg = context->SegDs;
198 break;
199 case 2: /* ss:(bp,si) */
200 base = LOWORD(context->Ebp) + LOWORD(context->Esi);
201 seg = context->SegSs;
202 break;
203 case 3: /* ss:(bp,di) */
204 base = LOWORD(context->Ebp) + LOWORD(context->Edi);
205 seg = context->SegSs;
206 break;
207 case 4: /* ds:(si) */
208 base = LOWORD(context->Esi);
209 seg = context->SegDs;
210 break;
211 case 5: /* ds:(di) */
212 base = LOWORD(context->Edi);
213 seg = context->SegDs;
214 break;
215 case 6: /* ss:(bp) */
216 base = LOWORD(context->Ebp);
217 seg = context->SegSs;
218 break;
219 case 7: /* ds:(bx) */
220 base = LOWORD(context->Ebx);
221 seg = context->SegDs;
222 break;
223 }
224
225 switch(mod)
226 {
227 case 0:
228 if (rm == 6) /* special case: ds:(disp16) */
229 {
230 GET_VAL( &base, WORD );
231 seg = context->SegDs;
232 }
233 break;
234
235 case 1: /* 8-bit disp */
236 GET_VAL( &off, BYTE );
237 base += (signed char)off;
238 break;
239
240 case 2: /* 16-bit disp */
241 GET_VAL( &off, WORD );
242 base += (signed short)off;
243 break;
244 }
245 base &= 0xffff;
246 }
247 if (segprefix != -1) seg = segprefix;
248
249 /* Make sure the segment and offset are valid */
250 if (IS_SELECTOR_SYSTEM(seg)) return (BYTE *)(base + (index << ss));
251 if (((seg & 7) != 7) || IS_SELECTOR_FREE(seg)) return NULL;
252 if (wine_ldt_copy.limit[seg >> 3] < (base + (index << ss))) return NULL;
253 return (char *) MapSL( MAKESEGPTR( seg, 0 ) ) + base + (index << ss);
254 #undef GET_VAL
255 }
256
257
258 /***********************************************************************
259 * INSTR_EmulateLDS
260 *
261 * Emulate the LDS (and LES,LFS,etc.) instruction.
262 */
263 static BOOL INSTR_EmulateLDS( CONTEXT86 *context, BYTE *instr, int long_op,
264 int long_addr, int segprefix, int *len )
265 {
266 WORD seg;
267 BYTE *regmodrm = instr + 1 + (*instr == 0x0f);
268 BYTE *addr = INSTR_GetOperandAddr( context, regmodrm,
269 long_addr, segprefix, len );
270 if (!addr)
271 return FALSE; /* Unable to emulate it */
272 seg = *(WORD *)(addr + (long_op ? 4 : 2));
273
274 if (!INSTR_ReplaceSelector( context, &seg ))
275 return FALSE; /* Unable to emulate it */
276
277 /* Now store the offset in the correct register */
278
279 switch((*regmodrm >> 3) & 7)
280 {
281 case 0:
282 if (long_op) context->Eax = *(DWORD *)addr;
283 else SET_LOWORD(context->Eax,*(WORD *)addr);
284 break;
285 case 1:
286 if (long_op) context->Ecx = *(DWORD *)addr;
287 else SET_LOWORD(context->Ecx,*(WORD *)addr);
288 break;
289 case 2:
290 if (long_op) context->Edx = *(DWORD *)addr;
291 else SET_LOWORD(context->Edx,*(WORD *)addr);
292 break;
293 case 3:
294 if (long_op) context->Ebx = *(DWORD *)addr;
295 else SET_LOWORD(context->Ebx,*(WORD *)addr);
296 break;
297 case 4:
298 if (long_op) context->Esp = *(DWORD *)addr;
299 else SET_LOWORD(context->Esp,*(WORD *)addr);
300 break;
301 case 5:
302 if (long_op) context->Ebp = *(DWORD *)addr;
303 else SET_LOWORD(context->Ebp,*(WORD *)addr);
304 break;
305 case 6:
306 if (long_op) context->Esi = *(DWORD *)addr;
307 else SET_LOWORD(context->Esi,*(WORD *)addr);
308 break;
309 case 7:
310 if (long_op) context->Edi = *(DWORD *)addr;
311 else SET_LOWORD(context->Edi,*(WORD *)addr);
312 break;
313 }
314
315 /* Store the correct segment in the segment register */
316
317 switch(*instr)
318 {
319 case 0xc4: context->SegEs = seg; break; /* les */
320 case 0xc5: context->SegDs = seg; break; /* lds */
321 case 0x0f: switch(instr[1])
322 {
323 case 0xb2: context->SegSs = seg; break; /* lss */
324 case 0xb4: context->SegFs = seg; break; /* lfs */
325 case 0xb5: context->SegGs = seg; break; /* lgs */
326 }
327 break;
328 }
329
330 /* Add the opcode size to the total length */
331
332 *len += 1 + (*instr == 0x0f);
333 return TRUE;
334 }
335
336 /***********************************************************************
337 * INSTR_inport
338 *
339 * input on a I/O port
340 */
341 static DWORD INSTR_inport( WORD port, int size, CONTEXT86 *context )
342 {
343 DWORD res = IO_inport( port, size );
344 if (TRACE_ON(io))
345 {
346 switch(size)
347 {
348 case 1:
349 DPRINTF( "0x%x < %02x @ %04x:%04x\n", port, LOBYTE(res),
350 (WORD)context->SegCs, LOWORD(context->Eip));
351 break;
352 case 2:
353 DPRINTF( "0x%x < %04x @ %04x:%04x\n", port, LOWORD(res),
354 (WORD)context->SegCs, LOWORD(context->Eip));
355 break;
356 case 4:
357 DPRINTF( "0x%x < %08lx @ %04x:%04x\n", port, res,
358 (WORD)context->SegCs, LOWORD(context->Eip));
359 break;
360 }
361 }
362 return res;
363 }
364
365
366 /***********************************************************************
367 * INSTR_outport
368 *
369 * output on a I/O port
370 */
371 static void INSTR_outport( WORD port, int size, DWORD val, CONTEXT86 *context )
372 {
373 IO_outport( port, size, val );
374 if (TRACE_ON(io))
375 {
376 switch(size)
377 {
378 case 1:
379 DPRINTF("0x%x > %02x @ %04x:%04x\n", port, LOBYTE(val),
380 (WORD)context->SegCs, LOWORD(context->Eip));
381 break;
382 case 2:
383 DPRINTF("0x%x > %04x @ %04x:%04x\n", port, LOWORD(val),
384 (WORD)context->SegCs, LOWORD(context->Eip));
385 break;
386 case 4:
387 DPRINTF("0x%x > %08lx @ %04x:%04x\n", port, val,
388 (WORD)context->SegCs, LOWORD(context->Eip));
389 break;
390 }
391 }
392 }
393
394
395 /***********************************************************************
396 * INSTR_EmulateInstruction
397 *
398 * Emulate a privileged instruction. Returns TRUE if emulation successful.
399 */
400 BOOL INSTR_EmulateInstruction( CONTEXT86 *context )
401 {
402 int prefix, segprefix, prefixlen, len, repX, long_op, long_addr;
403 SEGPTR gpHandler;
404 BYTE *instr;
405
406 long_op = long_addr = (!ISV86(context) && IS_SELECTOR_32BIT(context->SegCs));
407 instr = make_ptr( context, context->SegCs, context->Eip, TRUE );
408 if (!instr) return FALSE;
409
410 /* First handle any possible prefix */
411
412 segprefix = -1; /* no prefix */
413 prefix = 1;
414 repX = 0;
415 prefixlen = 0;
416 while(prefix)
417 {
418 switch(*instr)
419 {
420 case 0x2e:
421 segprefix = context->SegCs;
422 break;
423 case 0x36:
424 segprefix = context->SegSs;
425 break;
426 case 0x3e:
427 segprefix = context->SegDs;
428 break;
429 case 0x26:
430 segprefix = context->SegEs;
431 break;
432 case 0x64:
433 segprefix = context->SegFs;
434 break;
435 case 0x65:
436 segprefix = context->SegGs;
437 break;
438 case 0x66:
439 long_op = !long_op; /* opcode size prefix */
440 break;
441 case 0x67:
442 long_addr = !long_addr; /* addr size prefix */
443 break;
444 case 0xf0: /* lock */
445 break;
446 case 0xf2: /* repne */
447 repX = 1;
448 break;
449 case 0xf3: /* repe */
450 repX = 2;
451 break;
452 default:
453 prefix = 0; /* no more prefixes */
454 break;
455 }
456 if (prefix)
457 {
458 instr++;
459 prefixlen++;
460 }
461 }
462
463 /* Now look at the actual instruction */
464
465 switch(*instr)
466 {
467 case 0x07: /* pop es */
468 case 0x17: /* pop ss */
469 case 0x1f: /* pop ds */
470 {
471 WORD seg = *(WORD *)get_stack( context );
472 if (INSTR_ReplaceSelector( context, &seg ))
473 {
474 switch(*instr)
475 {
476 case 0x07: context->SegEs = seg; break;
477 case 0x17: context->SegSs = seg; break;
478 case 0x1f: context->SegDs = seg; break;
479 }
480 add_stack(context, long_op ? 4 : 2);
481 context->Eip += prefixlen + 1;
482 return TRUE;
483 }
484 }
485 break; /* Unable to emulate it */
486
487 case 0x0f: /* extended instruction */
488 switch(instr[1])
489 {
490 case 0x22: /* mov eax, crX */
491 switch (instr[2]) {
492 case 0xc0:
493 ERR("mov eax,cr0 at 0x%08lx, EAX=0x%08lx\n",
494 context->Eip,context->Eax );
495 context->Eip += prefixlen+3;
496 return TRUE;
497 default:
498 break; /*fallthrough to bad instruction handling */
499 }
500 break; /*fallthrough to bad instruction handling */
501 case 0x20: /* mov crX, eax */
502 switch (instr[2]) {
503 case 0xe0: /* mov cr4, eax */
504 /* CR4 register . See linux/arch/i386/mm/init.c, X86_CR4_ defs
505 * bit 0: VME Virtual Mode Exception ?
506 * bit 1: PVI Protected mode Virtual Interrupt
507 * bit 2: TSD Timestamp disable
508 * bit 3: DE Debugging extensions
509 * bit 4: PSE Page size extensions
510 * bit 5: PAE Physical address extension
511 * bit 6: MCE Machine check enable
512 * bit 7: PGE Enable global pages
513 * bit 8: PCE Enable performance counters at IPL3
514 */
515 ERR("mov cr4,eax at 0x%08lx\n",context->Eip);
516 context->Eax = 0;
517 context->Eip += prefixlen+3;
518 return TRUE;
519 case 0xc0: /* mov cr0, eax */
520 ERR("mov cr0,eax at 0x%08lx\n",context->Eip);
521 context->Eax = 0x10; /* FIXME: set more bits ? */
522 context->Eip += prefixlen+3;
523 return TRUE;
524 default: /* fallthrough to illegal instruction */
525 break;
526 }
527 /* fallthrough to illegal instruction */
528 break;
529 case 0xa1: /* pop fs */
530 {
531 WORD seg = *(WORD *)get_stack( context );
532 if (INSTR_ReplaceSelector( context, &seg ))
533 {
534 context->SegFs = seg;
535 add_stack(context, long_op ? 4 : 2);
536 context->Eip += prefixlen + 2;
537 return TRUE;
538 }
539 }
540 break;
541 case 0xa9: /* pop gs */
542 {
543 WORD seg = *(WORD *)get_stack( context );
544 if (INSTR_ReplaceSelector( context, &seg ))
545 {
546 context->SegGs = seg;
547 add_stack(context, long_op ? 4 : 2);
548 context->Eip += prefixlen + 2;
549 return TRUE;
550 }
551 }
552 break;
553 case 0xb2: /* lss addr,reg */
554 case 0xb4: /* lfs addr,reg */
555 case 0xb5: /* lgs addr,reg */
556 if (INSTR_EmulateLDS( context, instr, long_op,
557 long_addr, segprefix, &len ))
558 {
559 context->Eip += prefixlen + len;
560 return TRUE;
561 }
562 break;
563 }
564 break; /* Unable to emulate it */
565
566 case 0x6c: /* insb */
567 case 0x6d: /* insw/d */
568 case 0x6e: /* outsb */
569 case 0x6f: /* outsw/d */
570 {
571 int typ = *instr; /* Just in case it's overwritten. */
572 int outp = (typ >= 0x6e);
573 unsigned long count = repX ?
574 (long_addr ? context->Ecx : LOWORD(context->Ecx)) : 1;
575 int opsize = (typ & 1) ? (long_op ? 4 : 2) : 1;
576 int step = (context->EFlags & 0x400) ? -opsize : +opsize;
577 int seg = outp ? context->SegDs : context->SegEs; /* FIXME: is this right? */
578
579 if (outp)
580 /* FIXME: Check segment readable. */
581 (void)0;
582 else
583 /* FIXME: Check segment writeable. */
584 (void)0;
585
586 if (repX)
587 {
588 if (long_addr) context->Ecx = 0;
589 else SET_LOWORD(context->Ecx,0);
590 }
591
592 while (count-- > 0)
593 {
594 void *data;
595 WORD dx = LOWORD(context->Edx);
596 if (outp)
597 {
598 data = make_ptr( context, seg, context->Esi, long_addr );
599 if (long_addr) context->Esi += step;
600 else ADD_LOWORD(context->Esi,step);
601 }
602 else
603 {
604 data = make_ptr( context, seg, context->Edi, long_addr );
605 if (long_addr) context->Edi += step;
606 else ADD_LOWORD(context->Edi,step);
607 }
608
609 switch (typ)
610 {
611 case 0x6c:
612 *(BYTE *)data = INSTR_inport( dx, 1, context );
613 break;
614 case 0x6d:
615 if (long_op)
616 *(DWORD *)data = INSTR_inport( dx, 4, context );
617 else
618 *(WORD *)data = INSTR_inport( dx, 2, context );
619 break;
620 case 0x6e:
621 INSTR_outport( dx, 1, *(BYTE *)data, context );
622 break;
623 case 0x6f:
624 if (long_op)
625 INSTR_outport( dx, 4, *(DWORD *)data, context );
626 else
627 INSTR_outport( dx, 2, *(WORD *)data, context );
628 break;
629 }
630 }
631 context->Eip += prefixlen + 1;
632 }
633 return TRUE;
634
635 case 0x8e: /* mov XX,segment_reg */
636 {
637 WORD seg;
638 BYTE *addr = INSTR_GetOperandAddr(context, instr + 1,
639 long_addr, segprefix, &len );
640 if (!addr)
641 break; /* Unable to emulate it */
642 seg = *(WORD *)addr;
643 if (!INSTR_ReplaceSelector( context, &seg ))
644 break; /* Unable to emulate it */
645
646 switch((instr[1] >> 3) & 7)
647 {
648 case 0:
649 context->SegEs = seg;
650 context->Eip += prefixlen + len + 1;
651 return TRUE;
652 case 1: /* cs */
653 break;
654 case 2:
655 context->SegSs = seg;
656 context->Eip += prefixlen + len + 1;
657 return TRUE;
658 case 3:
659 context->SegDs = seg;
660 context->Eip += prefixlen + len + 1;
661 return TRUE;
662 case 4:
663 context->SegFs = seg;
664 context->Eip += prefixlen + len + 1;
665 return TRUE;
666 case 5:
667 context->SegGs = seg;
668 context->Eip += prefixlen + len + 1;
669 return TRUE;
670 case 6: /* unused */
671 case 7: /* unused */
672 break;
673 }
674 }
675 break; /* Unable to emulate it */
676
677 case 0xc4: /* les addr,reg */
678 case 0xc5: /* lds addr,reg */
679 if (INSTR_EmulateLDS( context, instr, long_op,
680 long_addr, segprefix, &len ))
681 {
682 context->Eip += prefixlen + len;
683 return TRUE;
684 }
685 break; /* Unable to emulate it */
686
687 case 0xcd: /* int <XX> */
688 if(!Dosvm.EmulateInterruptPM && !DPMI_LoadDosSystem())
689 ERR("could not initialize interrupt handling\n");
690 else {
691 context->Eip += prefixlen + 2;
692 Dosvm.EmulateInterruptPM( context, instr[1] );
693 return TRUE;
694 }
695 break; /* Unable to emulate it */
696
697 case 0xcf: /* iret */
698 if (long_op)
699 {
700 DWORD *stack = get_stack( context );
701 context->Eip = *stack++;
702 context->SegCs = *stack++;
703 context->EFlags = *stack;
704 add_stack(context, 3*sizeof(DWORD)); /* Pop the return address and flags */
705 }
706 else
707 {
708 WORD *stack = get_stack( context );
709 context->Eip = *stack++;
710 context->SegCs = *stack++;
711 SET_LOWORD(context->EFlags,*stack);
712 add_stack(context, 3*sizeof(WORD)); /* Pop the return address and flags */
713 }
714 return TRUE;
715
716 case 0xe4: /* inb al,XX */
717 SET_LOBYTE(context->Eax,INSTR_inport( instr[1], 1, context ));
718 context->Eip += prefixlen + 2;
719 return TRUE;
720
721 case 0xe5: /* in (e)ax,XX */
722 if (long_op)
723 context->Eax = INSTR_inport( instr[1], 4, context );
724 else
725 SET_LOWORD(context->Eax, INSTR_inport( instr[1], 2, context ));
726 context->Eip += prefixlen + 2;
727 return TRUE;
728
729 case 0xe6: /* outb XX,al */
730 INSTR_outport( instr[1], 1, LOBYTE(context->Eax), context );
731 context->Eip += prefixlen + 2;
732 return TRUE;
733
734 case 0xe7: /* out XX,(e)ax */
735 if (long_op)
736 INSTR_outport( instr[1], 4, context->Eax, context );
737 else
738 INSTR_outport( instr[1], 2, LOWORD(context->Eax), context );
739 context->Eip += prefixlen + 2;
740 return TRUE;
741
742 case 0xec: /* inb al,dx */
743 SET_LOBYTE(context->Eax, INSTR_inport( LOWORD(context->Edx), 1, context ) );
744 context->Eip += prefixlen + 1;
745 return TRUE;
746
747 case 0xed: /* in (e)ax,dx */
748 if (long_op)
749 context->Eax = INSTR_inport( LOWORD(context->Edx), 4, context );
750 else
751 SET_LOWORD(context->Eax, INSTR_inport( LOWORD(context->Edx), 2, context ));
752 context->Eip += prefixlen + 1;
753 return TRUE;
754
755 case 0xee: /* outb dx,al */
756 INSTR_outport( LOWORD(context->Edx), 1, LOBYTE(context->Eax), context );
757 context->Eip += prefixlen + 1;
758 return TRUE;
759
760 case 0xef: /* out dx,(e)ax */
761 if (long_op)
762 INSTR_outport( LOWORD(context->Edx), 4, context->Eax, context );
763 else
764 INSTR_outport( LOWORD(context->Edx), 2, LOWORD(context->Eax), context );
765 context->Eip += prefixlen + 1;
766 return TRUE;
767
768 case 0xfa: /* cli, ignored */
769 context->Eip += prefixlen + 1;
770 return TRUE;
771
772 case 0xfb: /* sti, ignored */
773 context->Eip += prefixlen + 1;
774 return TRUE;
775 }
776
777
778 /* Check for Win16 __GP handler */
779 gpHandler = HasGPHandler16( MAKESEGPTR( context->SegCs, context->Eip ) );
780 if (gpHandler)
781 {
782 WORD *stack = get_stack( context );
783 *--stack = context->SegCs;
784 *--stack = context->Eip;
785 add_stack(context, -2*sizeof(WORD));
786
787 context->SegCs = SELECTOROF( gpHandler );
788 context->Eip = OFFSETOF( gpHandler );
789 return TRUE;
790 }
791 return FALSE; /* Unable to emulate it */
792 }
793
794 #endif /* __i386__ */
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