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Long nameless args in SLTG apparently get denoted by 0xfffe.
[wine.git] / memory / instr.c
blob39167e5b644e31bbfc85833506939b632d577077
1 /*
2 * Emulation of priviledged instructions
3 *
4 * Copyright 1995 Alexandre Julliard
5 */
6
7 #include "windef.h"
8 #include "wingdi.h"
9 #include "wine/winuser16.h"
10 #include "module.h"
11 #include "miscemu.h"
12 #include "selectors.h"
13 #include "debugtools.h"
14
15 DEFAULT_DEBUG_CHANNEL(int);
16 DECLARE_DEBUG_CHANNEL(io);
17
18 #ifdef __i386__
19
20 inline static void add_stack( CONTEXT86 *context, int offset )
21 {
22 if (ISV86(context) || !IS_SELECTOR_32BIT(context->SegSs))
23 ADD_LOWORD( context->Esp, offset );
24 else
25 context->Esp += offset;
26 }
27
28 inline static void *make_ptr( CONTEXT86 *context, DWORD seg, DWORD off, int long_addr )
29 {
30 if (ISV86(context)) return PTR_REAL_TO_LIN( seg, off );
31 if (IS_SELECTOR_SYSTEM(seg)) return (void *)off;
32 if (!long_addr) off = LOWORD(off);
33 return MapSL( MAKESEGPTR( seg, off ) );
34 }
35
36 inline static void *get_stack( CONTEXT86 *context )
37 {
38 if (ISV86(context))
39 return PTR_REAL_TO_LIN( context->SegSs, context->Esp );
40 if (IS_SELECTOR_SYSTEM(context->SegSs))
41 return (void *)context->Esp;
42 if (IS_SELECTOR_32BIT(context->SegSs))
43 return MapSL( MAKESEGPTR( context->SegSs, context->Esp ) );
44 return MapSL( MAKESEGPTR( context->SegSs, LOWORD(context->Esp) ) );
45 }
46
47 /***********************************************************************
48 * INSTR_ReplaceSelector
49 *
50 * Try to replace an invalid selector by a valid one.
51 * The only selector where it is allowed to do "mov ax,40;mov es,ax"
52 * is the so called 'bimodal' selector 0x40, which points to the BIOS
53 * data segment. Used by (at least) Borland products (and programs compiled
54 * using Borland products).
55 *
56 * See Undocumented Windows, Chapter 5, __0040.
57 */
58 static BOOL INSTR_ReplaceSelector( CONTEXT86 *context, WORD *sel )
59 {
60 extern char Call16_Start, Call16_End;
61
62 if (IS_SELECTOR_SYSTEM(context->SegCs))
63 if ( (char *)context->Eip >= &Call16_Start
64 && (char *)context->Eip < &Call16_End )
65 {
66 /* Saved selector may have become invalid when the relay code */
67 /* tries to restore it. We simply clear it. */
68 *sel = 0;
69 return TRUE;
70 }
71
72 if (*sel == 0x40)
73 {
74 static WORD sys_timer = 0;
75 if (!sys_timer)
76 sys_timer = CreateSystemTimer( 55, DOSMEM_Tick );
77 *sel = DOSMEM_BiosDataSeg;
78 return TRUE;
79 }
80 if (!IS_SELECTOR_SYSTEM(*sel) && !IS_SELECTOR_FREE(*sel))
81 ERR("Got protection fault on valid selector, maybe your kernel is too old?\n" );
82 return FALSE; /* Can't replace selector, crashdump */
83 }
84
85
86 /***********************************************************************
87 * INSTR_GetOperandAddr
88 *
89 * Return the address of an instruction operand (from the mod/rm byte).
90 */
91 static BYTE *INSTR_GetOperandAddr( CONTEXT86 *context, BYTE *instr,
92 int long_addr, int segprefix, int *len )
93 {
94 int mod, rm, base, index = 0, ss = 0, seg = 0, off;
95
96 #define GET_VAL(val,type) \
97 { *val = *(type *)instr; instr += sizeof(type); *len += sizeof(type); }
98
99 *len = 0;
100 GET_VAL( &mod, BYTE );
101 rm = mod & 7;
102 mod >>= 6;
103
104 if (mod == 3)
105 {
106 switch(rm)
107 {
108 case 0: return (BYTE *)&context->Eax;
109 case 1: return (BYTE *)&context->Ecx;
110 case 2: return (BYTE *)&context->Edx;
111 case 3: return (BYTE *)&context->Ebx;
112 case 4: return (BYTE *)&context->Esp;
113 case 5: return (BYTE *)&context->Ebp;
114 case 6: return (BYTE *)&context->Esi;
115 case 7: return (BYTE *)&context->Edi;
116 }
117 }
118
119 if (long_addr)
120 {
121 if (rm == 4)
122 {
123 BYTE sib;
124 GET_VAL( &sib, BYTE );
125 rm = sib & 7;
126 ss = sib >> 6;
127 switch(sib >> 3)
128 {
129 case 0: index = context->Eax; break;
130 case 1: index = context->Ecx; break;
131 case 2: index = context->Edx; break;
132 case 3: index = context->Ebx; break;
133 case 4: index = 0; break;
134 case 5: index = context->Ebp; break;
135 case 6: index = context->Esi; break;
136 case 7: index = context->Edi; break;
137 }
138 }
139
140 switch(rm)
141 {
142 case 0: base = context->Eax; seg = context->SegDs; break;
143 case 1: base = context->Ecx; seg = context->SegDs; break;
144 case 2: base = context->Edx; seg = context->SegDs; break;
145 case 3: base = context->Ebx; seg = context->SegDs; break;
146 case 4: base = context->Esp; seg = context->SegSs; break;
147 case 5: base = context->Ebp; seg = context->SegSs; break;
148 case 6: base = context->Esi; seg = context->SegDs; break;
149 case 7: base = context->Edi; seg = context->SegDs; break;
150 }
151 switch (mod)
152 {
153 case 0:
154 if (rm == 5) /* special case: ds:(disp32) */
155 {
156 GET_VAL( &base, DWORD );
157 seg = context->SegDs;
158 }
159 break;
160
161 case 1: /* 8-bit disp */
162 GET_VAL( &off, BYTE );
163 base += (signed char)off;
164 break;
165
166 case 2: /* 32-bit disp */
167 GET_VAL( &off, DWORD );
168 base += (signed long)off;
169 break;
170 }
171 }
172 else /* short address */
173 {
174 switch(rm)
175 {
176 case 0: /* ds:(bx,si) */
177 base = LOWORD(context->Ebx) + LOWORD(context->Esi);
178 seg = context->SegDs;
179 break;
180 case 1: /* ds:(bx,di) */
181 base = LOWORD(context->Ebx) + LOWORD(context->Edi);
182 seg = context->SegDs;
183 break;
184 case 2: /* ss:(bp,si) */
185 base = LOWORD(context->Ebp) + LOWORD(context->Esi);
186 seg = context->SegSs;
187 break;
188 case 3: /* ss:(bp,di) */
189 base = LOWORD(context->Ebp) + LOWORD(context->Edi);
190 seg = context->SegSs;
191 break;
192 case 4: /* ds:(si) */
193 base = LOWORD(context->Esi);
194 seg = context->SegDs;
195 break;
196 case 5: /* ds:(di) */
197 base = LOWORD(context->Edi);
198 seg = context->SegDs;
199 break;
200 case 6: /* ss:(bp) */
201 base = LOWORD(context->Ebp);
202 seg = context->SegSs;
203 break;
204 case 7: /* ds:(bx) */
205 base = LOWORD(context->Ebx);
206 seg = context->SegDs;
207 break;
208 }
209
210 switch(mod)
211 {
212 case 0:
213 if (rm == 6) /* special case: ds:(disp16) */
214 {
215 GET_VAL( &base, WORD );
216 seg = context->SegDs;
217 }
218 break;
219
220 case 1: /* 8-bit disp */
221 GET_VAL( &off, BYTE );
222 base += (signed char)off;
223 break;
224
225 case 2: /* 16-bit disp */
226 GET_VAL( &off, WORD );
227 base += (signed short)off;
228 break;
229 }
230 base &= 0xffff;
231 }
232 if (segprefix != -1) seg = segprefix;
233
234 /* Make sure the segment and offset are valid */
235 if (IS_SELECTOR_SYSTEM(seg)) return (BYTE *)(base + (index << ss));
236 if (((seg & 7) != 7) || IS_SELECTOR_FREE(seg)) return NULL;
237 if (wine_ldt_copy.limit[seg >> 3] < (base + (index << ss))) return NULL;
238 return MapSL( MAKESEGPTR( seg, (base + (index << ss))) );
239 #undef GET_VAL
240 }
241
242
243 /***********************************************************************
244 * INSTR_EmulateLDS
245 *
246 * Emulate the LDS (and LES,LFS,etc.) instruction.
247 */
248 static BOOL INSTR_EmulateLDS( CONTEXT86 *context, BYTE *instr, int long_op,
249 int long_addr, int segprefix, int *len )
250 {
251 WORD seg;
252 BYTE *regmodrm = instr + 1 + (*instr == 0x0f);
253 BYTE *addr = INSTR_GetOperandAddr( context, regmodrm,
254 long_addr, segprefix, len );
255 if (!addr)
256 return FALSE; /* Unable to emulate it */
257 seg = *(WORD *)(addr + (long_op ? 4 : 2));
258
259 if (!INSTR_ReplaceSelector( context, &seg ))
260 return FALSE; /* Unable to emulate it */
261
262 /* Now store the offset in the correct register */
263
264 switch((*regmodrm >> 3) & 7)
265 {
266 case 0:
267 if (long_op) context->Eax = *(DWORD *)addr;
268 else SET_LOWORD(context->Eax,*(WORD *)addr);
269 break;
270 case 1:
271 if (long_op) context->Ecx = *(DWORD *)addr;
272 else SET_LOWORD(context->Ecx,*(WORD *)addr);
273 break;
274 case 2:
275 if (long_op) context->Edx = *(DWORD *)addr;
276 else SET_LOWORD(context->Edx,*(WORD *)addr);
277 break;
278 case 3:
279 if (long_op) context->Ebx = *(DWORD *)addr;
280 else SET_LOWORD(context->Ebx,*(WORD *)addr);
281 break;
282 case 4:
283 if (long_op) context->Esp = *(DWORD *)addr;
284 else SET_LOWORD(context->Esp,*(WORD *)addr);
285 break;
286 case 5:
287 if (long_op) context->Ebp = *(DWORD *)addr;
288 else SET_LOWORD(context->Ebp,*(WORD *)addr);
289 break;
290 case 6:
291 if (long_op) context->Esi = *(DWORD *)addr;
292 else SET_LOWORD(context->Esi,*(WORD *)addr);
293 break;
294 case 7:
295 if (long_op) context->Edi = *(DWORD *)addr;
296 else SET_LOWORD(context->Edi,*(WORD *)addr);
297 break;
298 }
299
300 /* Store the correct segment in the segment register */
301
302 switch(*instr)
303 {
304 case 0xc4: context->SegEs = seg; break; /* les */
305 case 0xc5: context->SegDs = seg; break; /* lds */
306 case 0x0f: switch(instr[1])
307 {
308 case 0xb2: context->SegSs = seg; break; /* lss */
309 case 0xb4: context->SegFs = seg; break; /* lfs */
310 case 0xb5: context->SegGs = seg; break; /* lgs */
311 }
312 break;
313 }
314
315 /* Add the opcode size to the total length */
316
317 *len += 1 + (*instr == 0x0f);
318 return TRUE;
319 }
320
321 /***********************************************************************
322 * INSTR_inport
323 *
324 * input on a I/O port
325 */
326 static DWORD INSTR_inport( WORD port, int size, CONTEXT86 *context )
327 {
328 DWORD res = IO_inport( port, size );
329 if (TRACE_ON(io))
330 {
331 switch(size)
332 {
333 case 1:
334 DPRINTF( "0x%x < %02x @ %04x:%04x\n", port, LOBYTE(res),
335 (WORD)context->SegCs, LOWORD(context->Eip));
336 break;
337 case 2:
338 DPRINTF( "0x%x < %04x @ %04x:%04x\n", port, LOWORD(res),
339 (WORD)context->SegCs, LOWORD(context->Eip));
340 break;
341 case 4:
342 DPRINTF( "0x%x < %08lx @ %04x:%04x\n", port, res,
343 (WORD)context->SegCs, LOWORD(context->Eip));
344 break;
345 }
346 }
347 return res;
348 }
349
350
351 /***********************************************************************
352 * INSTR_outport
353 *
354 * output on a I/O port
355 */
356 static void INSTR_outport( WORD port, int size, DWORD val, CONTEXT86 *context )
357 {
358 IO_outport( port, size, val );
359 if (TRACE_ON(io))
360 {
361 switch(size)
362 {
363 case 1:
364 DPRINTF("0x%x > %02x @ %04x:%04x\n", port, LOBYTE(val),
365 (WORD)context->SegCs, LOWORD(context->Eip));
366 break;
367 case 2:
368 DPRINTF("0x%x > %04x @ %04x:%04x\n", port, LOWORD(val),
369 (WORD)context->SegCs, LOWORD(context->Eip));
370 break;
371 case 4:
372 DPRINTF("0x%x > %08lx @ %04x:%04x\n", port, val,
373 (WORD)context->SegCs, LOWORD(context->Eip));
374 break;
375 }
376 }
377 }
378
379
380 /***********************************************************************
381 * INSTR_EmulateInstruction
382 *
383 * Emulate a priviledged instruction. Returns TRUE if emulation successful.
384 */
385 BOOL INSTR_EmulateInstruction( CONTEXT86 *context )
386 {
387 int prefix, segprefix, prefixlen, len, repX, long_op, long_addr;
388 SEGPTR gpHandler;
389 BYTE *instr;
390
391 long_op = long_addr = (!ISV86(context) && IS_SELECTOR_32BIT(context->SegCs));
392 instr = make_ptr( context, context->SegCs, context->Eip, TRUE );
393 if (!instr) return FALSE;
394
395 /* First handle any possible prefix */
396
397 segprefix = -1; /* no prefix */
398 prefix = 1;
399 repX = 0;
400 prefixlen = 0;
401 while(prefix)
402 {
403 switch(*instr)
404 {
405 case 0x2e:
406 segprefix = context->SegCs;
407 break;
408 case 0x36:
409 segprefix = context->SegSs;
410 break;
411 case 0x3e:
412 segprefix = context->SegDs;
413 break;
414 case 0x26:
415 segprefix = context->SegEs;
416 break;
417 case 0x64:
418 segprefix = context->SegFs;
419 break;
420 case 0x65:
421 segprefix = context->SegGs;
422 break;
423 case 0x66:
424 long_op = !long_op; /* opcode size prefix */
425 break;
426 case 0x67:
427 long_addr = !long_addr; /* addr size prefix */
428 break;
429 case 0xf0: /* lock */
430 break;
431 case 0xf2: /* repne */
432 repX = 1;
433 break;
434 case 0xf3: /* repe */
435 repX = 2;
436 break;
437 default:
438 prefix = 0; /* no more prefixes */
439 break;
440 }
441 if (prefix)
442 {
443 instr++;
444 prefixlen++;
445 }
446 }
447
448 /* Now look at the actual instruction */
449
450 switch(*instr)
451 {
452 case 0x07: /* pop es */
453 case 0x17: /* pop ss */
454 case 0x1f: /* pop ds */
455 {
456 WORD seg = *(WORD *)get_stack( context );
457 if (INSTR_ReplaceSelector( context, &seg ))
458 {
459 switch(*instr)
460 {
461 case 0x07: context->SegEs = seg; break;
462 case 0x17: context->SegSs = seg; break;
463 case 0x1f: context->SegDs = seg; break;
464 }
465 add_stack(context, long_op ? 4 : 2);
466 context->Eip += prefixlen + 1;
467 return TRUE;
468 }
469 }
470 break; /* Unable to emulate it */
471
472 case 0x0f: /* extended instruction */
473 switch(instr[1])
474 {
475 case 0x22: /* mov eax, crX */
476 switch (instr[2]) {
477 case 0xc0:
478 ERR("mov eax,cr0 at 0x%08lx, EAX=0x%08lx\n",
479 context->Eip,context->Eax );
480 context->Eip += prefixlen+3;
481 return TRUE;
482 default:
483 break; /*fallthrough to bad instruction handling */
484 }
485 break; /*fallthrough to bad instruction handling */
486 case 0x20: /* mov crX, eax */
487 switch (instr[2]) {
488 case 0xe0: /* mov cr4, eax */
489 /* CR4 register . See linux/arch/i386/mm/init.c, X86_CR4_ defs
490 * bit 0: VME Virtual Mode Exception ?
491 * bit 1: PVI Protected mode Virtual Interrupt
492 * bit 2: TSD Timestamp disable
493 * bit 3: DE Debugging extensions
494 * bit 4: PSE Page size extensions
495 * bit 5: PAE Physical address extension
496 * bit 6: MCE Machine check enable
497 * bit 7: PGE Enable global pages
498 * bit 8: PCE Enable performance counters at IPL3
499 */
500 ERR("mov cr4,eax at 0x%08lx\n",context->Eip);
501 context->Eax = 0;
502 context->Eip += prefixlen+3;
503 return TRUE;
504 case 0xc0: /* mov cr0, eax */
505 ERR("mov cr0,eax at 0x%08lx\n",context->Eip);
506 context->Eax = 0x10; /* FIXME: set more bits ? */
507 context->Eip += prefixlen+3;
508 return TRUE;
509 default: /* fallthrough to illegal instruction */
510 break;
511 }
512 /* fallthrough to illegal instruction */
513 break;
514 case 0xa1: /* pop fs */
515 {
516 WORD seg = *(WORD *)get_stack( context );
517 if (INSTR_ReplaceSelector( context, &seg ))
518 {
519 context->SegFs = seg;
520 add_stack(context, long_op ? 4 : 2);
521 context->Eip += prefixlen + 2;
522 return TRUE;
523 }
524 }
525 break;
526 case 0xa9: /* pop gs */
527 {
528 WORD seg = *(WORD *)get_stack( context );
529 if (INSTR_ReplaceSelector( context, &seg ))
530 {
531 context->SegGs = seg;
532 add_stack(context, long_op ? 4 : 2);
533 context->Eip += prefixlen + 2;
534 return TRUE;
535 }
536 }
537 break;
538 case 0xb2: /* lss addr,reg */
539 case 0xb4: /* lfs addr,reg */
540 case 0xb5: /* lgs addr,reg */
541 if (INSTR_EmulateLDS( context, instr, long_op,
542 long_addr, segprefix, &len ))
543 {
544 context->Eip += prefixlen + len;
545 return TRUE;
546 }
547 break;
548 }
549 break; /* Unable to emulate it */
550
551 case 0x6c: /* insb */
552 case 0x6d: /* insw/d */
553 case 0x6e: /* outsb */
554 case 0x6f: /* outsw/d */
555 {
556 int typ = *instr; /* Just in case it's overwritten. */
557 int outp = (typ >= 0x6e);
558 unsigned long count = repX ?
559 (long_addr ? context->Ecx : LOWORD(context->Ecx)) : 1;
560 int opsize = (typ & 1) ? (long_op ? 4 : 2) : 1;
561 int step = (context->EFlags & 0x400) ? -opsize : +opsize;
562 int seg = outp ? context->SegDs : context->SegEs; /* FIXME: is this right? */
563
564 if (outp)
565 /* FIXME: Check segment readable. */
566 (void)0;
567 else
568 /* FIXME: Check segment writeable. */
569 (void)0;
570
571 if (repX)
572 {
573 if (long_addr) context->Ecx = 0;
574 else SET_LOWORD(context->Ecx,0);
575 }
576
577 while (count-- > 0)
578 {
579 void *data;
580 WORD dx = LOWORD(context->Edx);
581 if (outp)
582 {
583 data = make_ptr( context, seg, context->Esi, long_addr );
584 if (long_addr) context->Esi += step;
585 else ADD_LOWORD(context->Esi,step);
586 }
587 else
588 {
589 data = make_ptr( context, seg, context->Edi, long_addr );
590 if (long_addr) context->Edi += step;
591 else ADD_LOWORD(context->Edi,step);
592 }
593
594 switch (typ)
595 {
596 case 0x6c:
597 *(BYTE *)data = INSTR_inport( dx, 1, context );
598 break;
599 case 0x6d:
600 if (long_op)
601 *(DWORD *)data = INSTR_inport( dx, 4, context );
602 else
603 *(WORD *)data = INSTR_inport( dx, 2, context );
604 break;
605 case 0x6e:
606 INSTR_outport( dx, 1, *(BYTE *)data, context );
607 break;
608 case 0x6f:
609 if (long_op)
610 INSTR_outport( dx, 4, *(DWORD *)data, context );
611 else
612 INSTR_outport( dx, 2, *(WORD *)data, context );
613 break;
614 }
615 }
616 context->Eip += prefixlen + 1;
617 }
618 return TRUE;
619
620 case 0x8e: /* mov XX,segment_reg */
621 {
622 WORD seg;
623 BYTE *addr = INSTR_GetOperandAddr(context, instr + 1,
624 long_addr, segprefix, &len );
625 if (!addr)
626 break; /* Unable to emulate it */
627 seg = *(WORD *)addr;
628 if (!INSTR_ReplaceSelector( context, &seg ))
629 break; /* Unable to emulate it */
630
631 switch((instr[1] >> 3) & 7)
632 {
633 case 0:
634 context->SegEs = seg;
635 context->Eip += prefixlen + len + 1;
636 return TRUE;
637 case 1: /* cs */
638 break;
639 case 2:
640 context->SegSs = seg;
641 context->Eip += prefixlen + len + 1;
642 return TRUE;
643 case 3:
644 context->SegDs = seg;
645 context->Eip += prefixlen + len + 1;
646 return TRUE;
647 case 4:
648 context->SegFs = seg;
649 context->Eip += prefixlen + len + 1;
650 return TRUE;
651 case 5:
652 context->SegGs = seg;
653 context->Eip += prefixlen + len + 1;
654 return TRUE;
655 case 6: /* unused */
656 case 7: /* unused */
657 break;
658 }
659 }
660 break; /* Unable to emulate it */
661
662 case 0xc4: /* les addr,reg */
663 case 0xc5: /* lds addr,reg */
664 if (INSTR_EmulateLDS( context, instr, long_op,
665 long_addr, segprefix, &len ))
666 {
667 context->Eip += prefixlen + len;
668 return TRUE;
669 }
670 break; /* Unable to emulate it */
671
672 case 0xcd: /* int <XX> */
673 if (long_op)
674 {
675 ERR("int xx from 32-bit code is not supported.\n");
676 break; /* Unable to emulate it */
677 }
678 else
679 {
680 FARPROC16 addr = INT_GetPMHandler( instr[1] );
681 WORD *stack = get_stack( context );
682 if (!addr)
683 {
684 FIXME("no handler for interrupt %02x, ignoring it\n", instr[1]);
685 context->Eip += prefixlen + 2;
686 return TRUE;
687 }
688 /* Push the flags and return address on the stack */
689 *(--stack) = LOWORD(context->EFlags);
690 *(--stack) = context->SegCs;
691 *(--stack) = LOWORD(context->Eip) + prefixlen + 2;
692 add_stack(context, -3 * sizeof(WORD));
693 /* Jump to the interrupt handler */
694 context->SegCs = HIWORD(addr);
695 context->Eip = LOWORD(addr);
696 }
697 return TRUE;
698
699 case 0xcf: /* iret */
700 if (long_op)
701 {
702 DWORD *stack = get_stack( context );
703 context->Eip = *stack++;
704 context->SegCs = *stack++;
705 context->EFlags = *stack;
706 add_stack(context, 3*sizeof(DWORD)); /* Pop the return address and flags */
707 }
708 else
709 {
710 WORD *stack = get_stack( context );
711 context->Eip = *stack++;
712 context->SegCs = *stack++;
713 SET_LOWORD(context->EFlags,*stack);
714 add_stack(context, 3*sizeof(WORD)); /* Pop the return address and flags */
715 }
716 return TRUE;
717
718 case 0xe4: /* inb al,XX */
719 SET_LOBYTE(context->Eax,INSTR_inport( instr[1], 1, context ));
720 context->Eip += prefixlen + 2;
721 return TRUE;
722
723 case 0xe5: /* in (e)ax,XX */
724 if (long_op)
725 context->Eax = INSTR_inport( instr[1], 4, context );
726 else
727 SET_LOWORD(context->Eax, INSTR_inport( instr[1], 2, context ));
728 context->Eip += prefixlen + 2;
729 return TRUE;
730
731 case 0xe6: /* outb XX,al */
732 INSTR_outport( instr[1], 1, LOBYTE(context->Eax), context );
733 context->Eip += prefixlen + 2;
734 return TRUE;
735
736 case 0xe7: /* out XX,(e)ax */
737 if (long_op)
738 INSTR_outport( instr[1], 4, context->Eax, context );
739 else
740 INSTR_outport( instr[1], 2, LOWORD(context->Eax), context );
741 context->Eip += prefixlen + 2;
742 return TRUE;
743
744 case 0xec: /* inb al,dx */
745 SET_LOBYTE(context->Eax, INSTR_inport( LOWORD(context->Edx), 1, context ) );
746 context->Eip += prefixlen + 1;
747 return TRUE;
748
749 case 0xed: /* in (e)ax,dx */
750 if (long_op)
751 context->Eax = INSTR_inport( LOWORD(context->Edx), 4, context );
752 else
753 SET_LOWORD(context->Eax, INSTR_inport( LOWORD(context->Edx), 2, context ));
754 context->Eip += prefixlen + 1;
755 return TRUE;
756
757 case 0xee: /* outb dx,al */
758 INSTR_outport( LOWORD(context->Edx), 1, LOBYTE(context->Eax), context );
759 context->Eip += prefixlen + 1;
760 return TRUE;
761
762 case 0xef: /* out dx,(e)ax */
763 if (long_op)
764 INSTR_outport( LOWORD(context->Edx), 4, context->Eax, context );
765 else
766 INSTR_outport( LOWORD(context->Edx), 2, LOWORD(context->Eax), context );
767 context->Eip += prefixlen + 1;
768 return TRUE;
769
770 case 0xfa: /* cli, ignored */
771 context->Eip += prefixlen + 1;
772 return TRUE;
773
774 case 0xfb: /* sti, ignored */
775 context->Eip += prefixlen + 1;
776 return TRUE;
777 }
778
779
780 /* Check for Win16 __GP handler */
781 gpHandler = HasGPHandler16( MAKESEGPTR( context->SegCs, context->Eip ) );
782 if (gpHandler)
783 {
784 WORD *stack = get_stack( context );
785 *--stack = context->SegCs;
786 *--stack = context->Eip;
787 add_stack(context, -2*sizeof(WORD));
788
789 context->SegCs = SELECTOROF( gpHandler );
790 context->Eip = OFFSETOF( gpHandler );
791 return TRUE;
792 }
793 return FALSE; /* Unable to emulate it */
794 }
795
796 #endif /* __i386__ */
Windows API implementation