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ImageList_SetImageCount should set nCurImage (the number of
[wine/hacks.git] / memory / instr.c
blobbbea64aba1f553a55548f658e68a7b44c4f19822
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
29 WINE_DEFAULT_DEBUG_CHANNEL(int);
30 WINE_DECLARE_DEBUG_CHANNEL(io);
31
32 #ifdef __i386__
33
34 inline static void add_stack( CONTEXT86 *context, int offset )
35 {
36 if (ISV86(context) || !IS_SELECTOR_32BIT(context->SegSs))
37 ADD_LOWORD( context->Esp, offset );
38 else
39 context->Esp += offset;
40 }
41
42 inline static void *make_ptr( CONTEXT86 *context, DWORD seg, DWORD off, int long_addr )
43 {
44 if (ISV86(context)) return PTR_REAL_TO_LIN( seg, off );
45 if (IS_SELECTOR_SYSTEM(seg)) return (void *)off;
46 if (!long_addr) off = LOWORD(off);
47 return MapSL( MAKESEGPTR( seg, 0 ) ) + off;
48 }
49
50 inline static void *get_stack( CONTEXT86 *context )
51 {
52 if (ISV86(context))
53 return PTR_REAL_TO_LIN( context->SegSs, context->Esp );
54 if (IS_SELECTOR_SYSTEM(context->SegSs))
55 return (void *)context->Esp;
56 if (IS_SELECTOR_32BIT(context->SegSs))
57 return MapSL( MAKESEGPTR( context->SegSs, 0 ) ) + context->Esp;
58 return MapSL( MAKESEGPTR( context->SegSs, LOWORD(context->Esp) ) );
59 }
60
61 /***********************************************************************
62 * INSTR_ReplaceSelector
63 *
64 * Try to replace an invalid selector by a valid one.
65 * The only selector where it is allowed to do "mov ax,40;mov es,ax"
66 * is the so called 'bimodal' selector 0x40, which points to the BIOS
67 * data segment. Used by (at least) Borland products (and programs compiled
68 * using Borland products).
69 *
70 * See Undocumented Windows, Chapter 5, __0040.
71 */
72 static BOOL INSTR_ReplaceSelector( CONTEXT86 *context, WORD *sel )
73 {
74 extern char Call16_Start, Call16_End;
75
76 if (IS_SELECTOR_SYSTEM(context->SegCs))
77 if ( (char *)context->Eip >= &Call16_Start
78 && (char *)context->Eip < &Call16_End )
79 {
80 /* Saved selector may have become invalid when the relay code */
81 /* tries to restore it. We simply clear it. */
82 *sel = 0;
83 return TRUE;
84 }
85
86 if (*sel == 0x40)
87 {
88 static WORD sys_timer = 0;
89 if (!sys_timer)
90 sys_timer = CreateSystemTimer( 55, DOSMEM_Tick );
91 *sel = DOSMEM_BiosDataSeg;
92 return TRUE;
93 }
94 if (!IS_SELECTOR_SYSTEM(*sel) && !IS_SELECTOR_FREE(*sel))
95 ERR("Got protection fault on valid selector, maybe your kernel is too old?\n" );
96 return FALSE; /* Can't replace selector, crashdump */
97 }
98
99
100 /***********************************************************************
101 * INSTR_GetOperandAddr
102 *
103 * Return the address of an instruction operand (from the mod/rm byte).
104 */
105 static BYTE *INSTR_GetOperandAddr( CONTEXT86 *context, BYTE *instr,
106 int long_addr, int segprefix, int *len )
107 {
108 int mod, rm, base, index = 0, ss = 0, seg = 0, off;
109
110 #define GET_VAL(val,type) \
111 { *val = *(type *)instr; instr += sizeof(type); *len += sizeof(type); }
112
113 *len = 0;
114 GET_VAL( &mod, BYTE );
115 rm = mod & 7;
116 mod >>= 6;
117
118 if (mod == 3)
119 {
120 switch(rm)
121 {
122 case 0: return (BYTE *)&context->Eax;
123 case 1: return (BYTE *)&context->Ecx;
124 case 2: return (BYTE *)&context->Edx;
125 case 3: return (BYTE *)&context->Ebx;
126 case 4: return (BYTE *)&context->Esp;
127 case 5: return (BYTE *)&context->Ebp;
128 case 6: return (BYTE *)&context->Esi;
129 case 7: return (BYTE *)&context->Edi;
130 }
131 }
132
133 if (long_addr)
134 {
135 if (rm == 4)
136 {
137 BYTE sib;
138 GET_VAL( &sib, BYTE );
139 rm = sib & 7;
140 ss = sib >> 6;
141 switch(sib >> 3)
142 {
143 case 0: index = context->Eax; break;
144 case 1: index = context->Ecx; break;
145 case 2: index = context->Edx; break;
146 case 3: index = context->Ebx; break;
147 case 4: index = 0; break;
148 case 5: index = context->Ebp; break;
149 case 6: index = context->Esi; break;
150 case 7: index = context->Edi; break;
151 }
152 }
153
154 switch(rm)
155 {
156 case 0: base = context->Eax; seg = context->SegDs; break;
157 case 1: base = context->Ecx; seg = context->SegDs; break;
158 case 2: base = context->Edx; seg = context->SegDs; break;
159 case 3: base = context->Ebx; seg = context->SegDs; break;
160 case 4: base = context->Esp; seg = context->SegSs; break;
161 case 5: base = context->Ebp; seg = context->SegSs; break;
162 case 6: base = context->Esi; seg = context->SegDs; break;
163 case 7: base = context->Edi; seg = context->SegDs; break;
164 }
165 switch (mod)
166 {
167 case 0:
168 if (rm == 5) /* special case: ds:(disp32) */
169 {
170 GET_VAL( &base, DWORD );
171 seg = context->SegDs;
172 }
173 break;
174
175 case 1: /* 8-bit disp */
176 GET_VAL( &off, BYTE );
177 base += (signed char)off;
178 break;
179
180 case 2: /* 32-bit disp */
181 GET_VAL( &off, DWORD );
182 base += (signed long)off;
183 break;
184 }
185 }
186 else /* short address */
187 {
188 switch(rm)
189 {
190 case 0: /* ds:(bx,si) */
191 base = LOWORD(context->Ebx) + LOWORD(context->Esi);
192 seg = context->SegDs;
193 break;
194 case 1: /* ds:(bx,di) */
195 base = LOWORD(context->Ebx) + LOWORD(context->Edi);
196 seg = context->SegDs;
197 break;
198 case 2: /* ss:(bp,si) */
199 base = LOWORD(context->Ebp) + LOWORD(context->Esi);
200 seg = context->SegSs;
201 break;
202 case 3: /* ss:(bp,di) */
203 base = LOWORD(context->Ebp) + LOWORD(context->Edi);
204 seg = context->SegSs;
205 break;
206 case 4: /* ds:(si) */
207 base = LOWORD(context->Esi);
208 seg = context->SegDs;
209 break;
210 case 5: /* ds:(di) */
211 base = LOWORD(context->Edi);
212 seg = context->SegDs;
213 break;
214 case 6: /* ss:(bp) */
215 base = LOWORD(context->Ebp);
216 seg = context->SegSs;
217 break;
218 case 7: /* ds:(bx) */
219 base = LOWORD(context->Ebx);
220 seg = context->SegDs;
221 break;
222 }
223
224 switch(mod)
225 {
226 case 0:
227 if (rm == 6) /* special case: ds:(disp16) */
228 {
229 GET_VAL( &base, WORD );
230 seg = context->SegDs;
231 }
232 break;
233
234 case 1: /* 8-bit disp */
235 GET_VAL( &off, BYTE );
236 base += (signed char)off;
237 break;
238
239 case 2: /* 16-bit disp */
240 GET_VAL( &off, WORD );
241 base += (signed short)off;
242 break;
243 }
244 base &= 0xffff;
245 }
246 if (segprefix != -1) seg = segprefix;
247
248 /* Make sure the segment and offset are valid */
249 if (IS_SELECTOR_SYSTEM(seg)) return (BYTE *)(base + (index << ss));
250 if (((seg & 7) != 7) || IS_SELECTOR_FREE(seg)) return NULL;
251 if (wine_ldt_copy.limit[seg >> 3] < (base + (index << ss))) return NULL;
252 return MapSL( MAKESEGPTR( seg, 0 ) ) + base + (index << ss);
253 #undef GET_VAL
254 }
255
256
257 /***********************************************************************
258 * INSTR_EmulateLDS
259 *
260 * Emulate the LDS (and LES,LFS,etc.) instruction.
261 */
262 static BOOL INSTR_EmulateLDS( CONTEXT86 *context, BYTE *instr, int long_op,
263 int long_addr, int segprefix, int *len )
264 {
265 WORD seg;
266 BYTE *regmodrm = instr + 1 + (*instr == 0x0f);
267 BYTE *addr = INSTR_GetOperandAddr( context, regmodrm,
268 long_addr, segprefix, len );
269 if (!addr)
270 return FALSE; /* Unable to emulate it */
271 seg = *(WORD *)(addr + (long_op ? 4 : 2));
272
273 if (!INSTR_ReplaceSelector( context, &seg ))
274 return FALSE; /* Unable to emulate it */
275
276 /* Now store the offset in the correct register */
277
278 switch((*regmodrm >> 3) & 7)
279 {
280 case 0:
281 if (long_op) context->Eax = *(DWORD *)addr;
282 else SET_LOWORD(context->Eax,*(WORD *)addr);
283 break;
284 case 1:
285 if (long_op) context->Ecx = *(DWORD *)addr;
286 else SET_LOWORD(context->Ecx,*(WORD *)addr);
287 break;
288 case 2:
289 if (long_op) context->Edx = *(DWORD *)addr;
290 else SET_LOWORD(context->Edx,*(WORD *)addr);
291 break;
292 case 3:
293 if (long_op) context->Ebx = *(DWORD *)addr;
294 else SET_LOWORD(context->Ebx,*(WORD *)addr);
295 break;
296 case 4:
297 if (long_op) context->Esp = *(DWORD *)addr;
298 else SET_LOWORD(context->Esp,*(WORD *)addr);
299 break;
300 case 5:
301 if (long_op) context->Ebp = *(DWORD *)addr;
302 else SET_LOWORD(context->Ebp,*(WORD *)addr);
303 break;
304 case 6:
305 if (long_op) context->Esi = *(DWORD *)addr;
306 else SET_LOWORD(context->Esi,*(WORD *)addr);
307 break;
308 case 7:
309 if (long_op) context->Edi = *(DWORD *)addr;
310 else SET_LOWORD(context->Edi,*(WORD *)addr);
311 break;
312 }
313
314 /* Store the correct segment in the segment register */
315
316 switch(*instr)
317 {
318 case 0xc4: context->SegEs = seg; break; /* les */
319 case 0xc5: context->SegDs = seg; break; /* lds */
320 case 0x0f: switch(instr[1])
321 {
322 case 0xb2: context->SegSs = seg; break; /* lss */
323 case 0xb4: context->SegFs = seg; break; /* lfs */
324 case 0xb5: context->SegGs = seg; break; /* lgs */
325 }
326 break;
327 }
328
329 /* Add the opcode size to the total length */
330
331 *len += 1 + (*instr == 0x0f);
332 return TRUE;
333 }
334
335 /***********************************************************************
336 * INSTR_inport
337 *
338 * input on a I/O port
339 */
340 static DWORD INSTR_inport( WORD port, int size, CONTEXT86 *context )
341 {
342 DWORD res = IO_inport( port, size );
343 if (TRACE_ON(io))
344 {
345 switch(size)
346 {
347 case 1:
348 DPRINTF( "0x%x < %02x @ %04x:%04x\n", port, LOBYTE(res),
349 (WORD)context->SegCs, LOWORD(context->Eip));
350 break;
351 case 2:
352 DPRINTF( "0x%x < %04x @ %04x:%04x\n", port, LOWORD(res),
353 (WORD)context->SegCs, LOWORD(context->Eip));
354 break;
355 case 4:
356 DPRINTF( "0x%x < %08lx @ %04x:%04x\n", port, res,
357 (WORD)context->SegCs, LOWORD(context->Eip));
358 break;
359 }
360 }
361 return res;
362 }
363
364
365 /***********************************************************************
366 * INSTR_outport
367 *
368 * output on a I/O port
369 */
370 static void INSTR_outport( WORD port, int size, DWORD val, CONTEXT86 *context )
371 {
372 IO_outport( port, size, val );
373 if (TRACE_ON(io))
374 {
375 switch(size)
376 {
377 case 1:
378 DPRINTF("0x%x > %02x @ %04x:%04x\n", port, LOBYTE(val),
379 (WORD)context->SegCs, LOWORD(context->Eip));
380 break;
381 case 2:
382 DPRINTF("0x%x > %04x @ %04x:%04x\n", port, LOWORD(val),
383 (WORD)context->SegCs, LOWORD(context->Eip));
384 break;
385 case 4:
386 DPRINTF("0x%x > %08lx @ %04x:%04x\n", port, val,
387 (WORD)context->SegCs, LOWORD(context->Eip));
388 break;
389 }
390 }
391 }
392
393
394 /***********************************************************************
395 * INSTR_EmulateInstruction
396 *
397 * Emulate a privileged instruction. Returns TRUE if emulation successful.
398 */
399 BOOL INSTR_EmulateInstruction( CONTEXT86 *context )
400 {
401 int prefix, segprefix, prefixlen, len, repX, long_op, long_addr;
402 SEGPTR gpHandler;
403 BYTE *instr;
404
405 long_op = long_addr = (!ISV86(context) && IS_SELECTOR_32BIT(context->SegCs));
406 instr = make_ptr( context, context->SegCs, context->Eip, TRUE );
407 if (!instr) return FALSE;
408
409 /* First handle any possible prefix */
410
411 segprefix = -1; /* no prefix */
412 prefix = 1;
413 repX = 0;
414 prefixlen = 0;
415 while(prefix)
416 {
417 switch(*instr)
418 {
419 case 0x2e:
420 segprefix = context->SegCs;
421 break;
422 case 0x36:
423 segprefix = context->SegSs;
424 break;
425 case 0x3e:
426 segprefix = context->SegDs;
427 break;
428 case 0x26:
429 segprefix = context->SegEs;
430 break;
431 case 0x64:
432 segprefix = context->SegFs;
433 break;
434 case 0x65:
435 segprefix = context->SegGs;
436 break;
437 case 0x66:
438 long_op = !long_op; /* opcode size prefix */
439 break;
440 case 0x67:
441 long_addr = !long_addr; /* addr size prefix */
442 break;
443 case 0xf0: /* lock */
444 break;
445 case 0xf2: /* repne */
446 repX = 1;
447 break;
448 case 0xf3: /* repe */
449 repX = 2;
450 break;
451 default:
452 prefix = 0; /* no more prefixes */
453 break;
454 }
455 if (prefix)
456 {
457 instr++;
458 prefixlen++;
459 }
460 }
461
462 /* Now look at the actual instruction */
463
464 switch(*instr)
465 {
466 case 0x07: /* pop es */
467 case 0x17: /* pop ss */
468 case 0x1f: /* pop ds */
469 {
470 WORD seg = *(WORD *)get_stack( context );
471 if (INSTR_ReplaceSelector( context, &seg ))
472 {
473 switch(*instr)
474 {
475 case 0x07: context->SegEs = seg; break;
476 case 0x17: context->SegSs = seg; break;
477 case 0x1f: context->SegDs = seg; break;
478 }
479 add_stack(context, long_op ? 4 : 2);
480 context->Eip += prefixlen + 1;
481 return TRUE;
482 }
483 }
484 break; /* Unable to emulate it */
485
486 case 0x0f: /* extended instruction */
487 switch(instr[1])
488 {
489 case 0x22: /* mov eax, crX */
490 switch (instr[2]) {
491 case 0xc0:
492 ERR("mov eax,cr0 at 0x%08lx, EAX=0x%08lx\n",
493 context->Eip,context->Eax );
494 context->Eip += prefixlen+3;
495 return TRUE;
496 default:
497 break; /*fallthrough to bad instruction handling */
498 }
499 break; /*fallthrough to bad instruction handling */
500 case 0x20: /* mov crX, eax */
501 switch (instr[2]) {
502 case 0xe0: /* mov cr4, eax */
503 /* CR4 register . See linux/arch/i386/mm/init.c, X86_CR4_ defs
504 * bit 0: VME Virtual Mode Exception ?
505 * bit 1: PVI Protected mode Virtual Interrupt
506 * bit 2: TSD Timestamp disable
507 * bit 3: DE Debugging extensions
508 * bit 4: PSE Page size extensions
509 * bit 5: PAE Physical address extension
510 * bit 6: MCE Machine check enable
511 * bit 7: PGE Enable global pages
512 * bit 8: PCE Enable performance counters at IPL3
513 */
514 ERR("mov cr4,eax at 0x%08lx\n",context->Eip);
515 context->Eax = 0;
516 context->Eip += prefixlen+3;
517 return TRUE;
518 case 0xc0: /* mov cr0, eax */
519 ERR("mov cr0,eax at 0x%08lx\n",context->Eip);
520 context->Eax = 0x10; /* FIXME: set more bits ? */
521 context->Eip += prefixlen+3;
522 return TRUE;
523 default: /* fallthrough to illegal instruction */
524 break;
525 }
526 /* fallthrough to illegal instruction */
527 break;
528 case 0xa1: /* pop fs */
529 {
530 WORD seg = *(WORD *)get_stack( context );
531 if (INSTR_ReplaceSelector( context, &seg ))
532 {
533 context->SegFs = seg;
534 add_stack(context, long_op ? 4 : 2);
535 context->Eip += prefixlen + 2;
536 return TRUE;
537 }
538 }
539 break;
540 case 0xa9: /* pop gs */
541 {
542 WORD seg = *(WORD *)get_stack( context );
543 if (INSTR_ReplaceSelector( context, &seg ))
544 {
545 context->SegGs = seg;
546 add_stack(context, long_op ? 4 : 2);
547 context->Eip += prefixlen + 2;
548 return TRUE;
549 }
550 }
551 break;
552 case 0xb2: /* lss addr,reg */
553 case 0xb4: /* lfs addr,reg */
554 case 0xb5: /* lgs addr,reg */
555 if (INSTR_EmulateLDS( context, instr, long_op,
556 long_addr, segprefix, &len ))
557 {
558 context->Eip += prefixlen + len;
559 return TRUE;
560 }
561 break;
562 }
563 break; /* Unable to emulate it */
564
565 case 0x6c: /* insb */
566 case 0x6d: /* insw/d */
567 case 0x6e: /* outsb */
568 case 0x6f: /* outsw/d */
569 {
570 int typ = *instr; /* Just in case it's overwritten. */
571 int outp = (typ >= 0x6e);
572 unsigned long count = repX ?
573 (long_addr ? context->Ecx : LOWORD(context->Ecx)) : 1;
574 int opsize = (typ & 1) ? (long_op ? 4 : 2) : 1;
575 int step = (context->EFlags & 0x400) ? -opsize : +opsize;
576 int seg = outp ? context->SegDs : context->SegEs; /* FIXME: is this right? */
577
578 if (outp)
579 /* FIXME: Check segment readable. */
580 (void)0;
581 else
582 /* FIXME: Check segment writeable. */
583 (void)0;
584
585 if (repX)
586 {
587 if (long_addr) context->Ecx = 0;
588 else SET_LOWORD(context->Ecx,0);
589 }
590
591 while (count-- > 0)
592 {
593 void *data;
594 WORD dx = LOWORD(context->Edx);
595 if (outp)
596 {
597 data = make_ptr( context, seg, context->Esi, long_addr );
598 if (long_addr) context->Esi += step;
599 else ADD_LOWORD(context->Esi,step);
600 }
601 else
602 {
603 data = make_ptr( context, seg, context->Edi, long_addr );
604 if (long_addr) context->Edi += step;
605 else ADD_LOWORD(context->Edi,step);
606 }
607
608 switch (typ)
609 {
610 case 0x6c:
611 *(BYTE *)data = INSTR_inport( dx, 1, context );
612 break;
613 case 0x6d:
614 if (long_op)
615 *(DWORD *)data = INSTR_inport( dx, 4, context );
616 else
617 *(WORD *)data = INSTR_inport( dx, 2, context );
618 break;
619 case 0x6e:
620 INSTR_outport( dx, 1, *(BYTE *)data, context );
621 break;
622 case 0x6f:
623 if (long_op)
624 INSTR_outport( dx, 4, *(DWORD *)data, context );
625 else
626 INSTR_outport( dx, 2, *(WORD *)data, context );
627 break;
628 }
629 }
630 context->Eip += prefixlen + 1;
631 }
632 return TRUE;
633
634 case 0x8e: /* mov XX,segment_reg */
635 {
636 WORD seg;
637 BYTE *addr = INSTR_GetOperandAddr(context, instr + 1,
638 long_addr, segprefix, &len );
639 if (!addr)
640 break; /* Unable to emulate it */
641 seg = *(WORD *)addr;
642 if (!INSTR_ReplaceSelector( context, &seg ))
643 break; /* Unable to emulate it */
644
645 switch((instr[1] >> 3) & 7)
646 {
647 case 0:
648 context->SegEs = seg;
649 context->Eip += prefixlen + len + 1;
650 return TRUE;
651 case 1: /* cs */
652 break;
653 case 2:
654 context->SegSs = seg;
655 context->Eip += prefixlen + len + 1;
656 return TRUE;
657 case 3:
658 context->SegDs = seg;
659 context->Eip += prefixlen + len + 1;
660 return TRUE;
661 case 4:
662 context->SegFs = seg;
663 context->Eip += prefixlen + len + 1;
664 return TRUE;
665 case 5:
666 context->SegGs = seg;
667 context->Eip += prefixlen + len + 1;
668 return TRUE;
669 case 6: /* unused */
670 case 7: /* unused */
671 break;
672 }
673 }
674 break; /* Unable to emulate it */
675
676 case 0xc4: /* les addr,reg */
677 case 0xc5: /* lds addr,reg */
678 if (INSTR_EmulateLDS( context, instr, long_op,
679 long_addr, segprefix, &len ))
680 {
681 context->Eip += prefixlen + len;
682 return TRUE;
683 }
684 break; /* Unable to emulate it */
685
686 case 0xcd: /* int <XX> */
687 if (long_op)
688 {
689 ERR("int xx from 32-bit code is not supported.\n");
690 break; /* Unable to emulate it */
691 }
692 else
693 {
694 FARPROC16 addr = INT_GetPMHandler( instr[1] );
695 WORD *stack = get_stack( context );
696 if (!addr)
697 {
698 FIXME("no handler for interrupt %02x, ignoring it\n", instr[1]);
699 context->Eip += prefixlen + 2;
700 return TRUE;
701 }
702 /* Push the flags and return address on the stack */
703 *(--stack) = LOWORD(context->EFlags);
704 *(--stack) = context->SegCs;
705 *(--stack) = LOWORD(context->Eip) + prefixlen + 2;
706 add_stack(context, -3 * sizeof(WORD));
707 /* Jump to the interrupt handler */
708 context->SegCs = HIWORD(addr);
709 context->Eip = LOWORD(addr);
710 }
711 return TRUE;
712
713 case 0xcf: /* iret */
714 if (long_op)
715 {
716 DWORD *stack = get_stack( context );
717 context->Eip = *stack++;
718 context->SegCs = *stack++;
719 context->EFlags = *stack;
720 add_stack(context, 3*sizeof(DWORD)); /* Pop the return address and flags */
721 }
722 else
723 {
724 WORD *stack = get_stack( context );
725 context->Eip = *stack++;
726 context->SegCs = *stack++;
727 SET_LOWORD(context->EFlags,*stack);
728 add_stack(context, 3*sizeof(WORD)); /* Pop the return address and flags */
729 }
730 return TRUE;
731
732 case 0xe4: /* inb al,XX */
733 SET_LOBYTE(context->Eax,INSTR_inport( instr[1], 1, context ));
734 context->Eip += prefixlen + 2;
735 return TRUE;
736
737 case 0xe5: /* in (e)ax,XX */
738 if (long_op)
739 context->Eax = INSTR_inport( instr[1], 4, context );
740 else
741 SET_LOWORD(context->Eax, INSTR_inport( instr[1], 2, context ));
742 context->Eip += prefixlen + 2;
743 return TRUE;
744
745 case 0xe6: /* outb XX,al */
746 INSTR_outport( instr[1], 1, LOBYTE(context->Eax), context );
747 context->Eip += prefixlen + 2;
748 return TRUE;
749
750 case 0xe7: /* out XX,(e)ax */
751 if (long_op)
752 INSTR_outport( instr[1], 4, context->Eax, context );
753 else
754 INSTR_outport( instr[1], 2, LOWORD(context->Eax), context );
755 context->Eip += prefixlen + 2;
756 return TRUE;
757
758 case 0xec: /* inb al,dx */
759 SET_LOBYTE(context->Eax, INSTR_inport( LOWORD(context->Edx), 1, context ) );
760 context->Eip += prefixlen + 1;
761 return TRUE;
762
763 case 0xed: /* in (e)ax,dx */
764 if (long_op)
765 context->Eax = INSTR_inport( LOWORD(context->Edx), 4, context );
766 else
767 SET_LOWORD(context->Eax, INSTR_inport( LOWORD(context->Edx), 2, context ));
768 context->Eip += prefixlen + 1;
769 return TRUE;
770
771 case 0xee: /* outb dx,al */
772 INSTR_outport( LOWORD(context->Edx), 1, LOBYTE(context->Eax), context );
773 context->Eip += prefixlen + 1;
774 return TRUE;
775
776 case 0xef: /* out dx,(e)ax */
777 if (long_op)
778 INSTR_outport( LOWORD(context->Edx), 4, context->Eax, context );
779 else
780 INSTR_outport( LOWORD(context->Edx), 2, LOWORD(context->Eax), context );
781 context->Eip += prefixlen + 1;
782 return TRUE;
783
784 case 0xfa: /* cli, ignored */
785 context->Eip += prefixlen + 1;
786 return TRUE;
787
788 case 0xfb: /* sti, ignored */
789 context->Eip += prefixlen + 1;
790 return TRUE;
791 }
792
793
794 /* Check for Win16 __GP handler */
795 gpHandler = HasGPHandler16( MAKESEGPTR( context->SegCs, context->Eip ) );
796 if (gpHandler)
797 {
798 WORD *stack = get_stack( context );
799 *--stack = context->SegCs;
800 *--stack = context->Eip;
801 add_stack(context, -2*sizeof(WORD));
802
803 context->SegCs = SELECTOROF( gpHandler );
804 context->Eip = OFFSETOF( gpHandler );
805 return TRUE;
806 }
807 return FALSE; /* Unable to emulate it */
808 }
809
810 #endif /* __i386__ */
useful hacks and other patches not (yet) suitable for mainline