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Added YUV routines needed for v4l driver, and in the future possibly
[wine/gsoc-2012-control.git] / dlls / kernel / instr.c
blob14ed22696721218b565a7c1d71de24cc589dc04d
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 "config.h"
22 #include "wine/port.h"
23
24 #include <stdarg.h>
25
26 #include "ntstatus.h"
27 #include "windef.h"
28 #include "winbase.h"
29 #include "wingdi.h"
30 #include "wine/winuser16.h"
31 #include "excpt.h"
32 #include "thread.h"
33 #include "wine/debug.h"
34 #include "kernel_private.h"
35 #include "kernel16_private.h"
36 #include "wine/exception.h"
37
38 WINE_DEFAULT_DEBUG_CHANNEL(int);
39 WINE_DECLARE_DEBUG_CHANNEL(io);
40
41 /* macros to set parts of a DWORD */
42 #define SET_LOWORD(dw,val) ((dw) = ((dw) & 0xffff0000) | LOWORD(val))
43 #define SET_LOBYTE(dw,val) ((dw) = ((dw) & 0xffffff00) | LOBYTE(val))
44 #define ADD_LOWORD(dw,val) ((dw) = ((dw) & 0xffff0000) | LOWORD((DWORD)(dw)+(val)))
45 #define ISV86(context) ((context)->EFlags & 0x00020000)
46
47 inline static void add_stack( CONTEXT86 *context, int offset )
48 {
49 if (ISV86(context) || !IS_SELECTOR_32BIT(context->SegSs))
50 ADD_LOWORD( context->Esp, offset );
51 else
52 context->Esp += offset;
53 }
54
55 inline static void *make_ptr( CONTEXT86 *context, DWORD seg, DWORD off, int long_addr )
56 {
57 if (ISV86(context)) return (void *)((seg << 4) + LOWORD(off));
58 if (wine_ldt_is_system(seg)) return (void *)off;
59 if (!long_addr) off = LOWORD(off);
60 return (char *) MapSL( MAKESEGPTR( seg, 0 ) ) + off;
61 }
62
63 inline static void *get_stack( CONTEXT86 *context )
64 {
65 if (ISV86(context)) return (void *)((context->SegSs << 4) + LOWORD(context->Esp));
66 return wine_ldt_get_ptr( context->SegSs, context->Esp );
67 }
68
69 /***********************************************************************
70 * INSTR_ReplaceSelector
71 *
72 * Try to replace an invalid selector by a valid one.
73 * The only selector where it is allowed to do "mov ax,40;mov es,ax"
74 * is the so called 'bimodal' selector 0x40, which points to the BIOS
75 * data segment. Used by (at least) Borland products (and programs compiled
76 * using Borland products).
77 *
78 * See Undocumented Windows, Chapter 5, __0040.
79 */
80 static BOOL INSTR_ReplaceSelector( CONTEXT86 *context, WORD *sel )
81 {
82 if (*sel == 0x40)
83 {
84 static WORD sys_timer = 0;
85 if (!sys_timer)
86 {
87 if (!winedos.BiosTick) load_winedos();
88 if (winedos.BiosTick)
89 sys_timer = CreateSystemTimer( 55, winedos.BiosTick );
90 }
91 *sel = DOSMEM_BiosDataSeg;
92 return TRUE;
93 }
94 return FALSE; /* Can't replace selector, crashdump */
95 }
96
97
98 /***********************************************************************
99 * INSTR_GetOperandAddr
100 *
101 * Return the address of an instruction operand (from the mod/rm byte).
102 */
103 static BYTE *INSTR_GetOperandAddr( CONTEXT86 *context, BYTE *instr,
104 int long_addr, int segprefix, int *len )
105 {
106 int mod, rm, base = 0, index = 0, ss = 0, seg = 0, off;
107 LDT_ENTRY entry;
108
109 #define GET_VAL(val,type) \
110 { *val = *(type *)instr; instr += sizeof(type); *len += sizeof(type); }
111
112 *len = 0;
113 GET_VAL( &mod, BYTE );
114 rm = mod & 7;
115 mod >>= 6;
116
117 if (mod == 3)
118 {
119 switch(rm)
120 {
121 case 0: return (BYTE *)&context->Eax;
122 case 1: return (BYTE *)&context->Ecx;
123 case 2: return (BYTE *)&context->Edx;
124 case 3: return (BYTE *)&context->Ebx;
125 case 4: return (BYTE *)&context->Esp;
126 case 5: return (BYTE *)&context->Ebp;
127 case 6: return (BYTE *)&context->Esi;
128 case 7: return (BYTE *)&context->Edi;
129 }
130 }
131
132 if (long_addr)
133 {
134 if (rm == 4)
135 {
136 BYTE sib;
137 GET_VAL( &sib, BYTE );
138 rm = sib & 7;
139 ss = sib >> 6;
140 switch(sib >> 3)
141 {
142 case 0: index = context->Eax; break;
143 case 1: index = context->Ecx; break;
144 case 2: index = context->Edx; break;
145 case 3: index = context->Ebx; break;
146 case 4: index = 0; break;
147 case 5: index = context->Ebp; break;
148 case 6: index = context->Esi; break;
149 case 7: index = context->Edi; break;
150 }
151 }
152
153 switch(rm)
154 {
155 case 0: base = context->Eax; seg = context->SegDs; break;
156 case 1: base = context->Ecx; seg = context->SegDs; break;
157 case 2: base = context->Edx; seg = context->SegDs; break;
158 case 3: base = context->Ebx; seg = context->SegDs; break;
159 case 4: base = context->Esp; seg = context->SegSs; break;
160 case 5: base = context->Ebp; seg = context->SegSs; break;
161 case 6: base = context->Esi; seg = context->SegDs; break;
162 case 7: base = context->Edi; seg = context->SegDs; break;
163 }
164 switch (mod)
165 {
166 case 0:
167 if (rm == 5) /* special case: ds:(disp32) */
168 {
169 GET_VAL( &base, DWORD );
170 seg = context->SegDs;
171 }
172 break;
173
174 case 1: /* 8-bit disp */
175 GET_VAL( &off, BYTE );
176 base += (signed char)off;
177 break;
178
179 case 2: /* 32-bit disp */
180 GET_VAL( &off, DWORD );
181 base += (signed long)off;
182 break;
183 }
184 }
185 else /* short address */
186 {
187 switch(rm)
188 {
189 case 0: /* ds:(bx,si) */
190 base = LOWORD(context->Ebx) + LOWORD(context->Esi);
191 seg = context->SegDs;
192 break;
193 case 1: /* ds:(bx,di) */
194 base = LOWORD(context->Ebx) + LOWORD(context->Edi);
195 seg = context->SegDs;
196 break;
197 case 2: /* ss:(bp,si) */
198 base = LOWORD(context->Ebp) + LOWORD(context->Esi);
199 seg = context->SegSs;
200 break;
201 case 3: /* ss:(bp,di) */
202 base = LOWORD(context->Ebp) + LOWORD(context->Edi);
203 seg = context->SegSs;
204 break;
205 case 4: /* ds:(si) */
206 base = LOWORD(context->Esi);
207 seg = context->SegDs;
208 break;
209 case 5: /* ds:(di) */
210 base = LOWORD(context->Edi);
211 seg = context->SegDs;
212 break;
213 case 6: /* ss:(bp) */
214 base = LOWORD(context->Ebp);
215 seg = context->SegSs;
216 break;
217 case 7: /* ds:(bx) */
218 base = LOWORD(context->Ebx);
219 seg = context->SegDs;
220 break;
221 }
222
223 switch(mod)
224 {
225 case 0:
226 if (rm == 6) /* special case: ds:(disp16) */
227 {
228 GET_VAL( &base, WORD );
229 seg = context->SegDs;
230 }
231 break;
232
233 case 1: /* 8-bit disp */
234 GET_VAL( &off, BYTE );
235 base += (signed char)off;
236 break;
237
238 case 2: /* 16-bit disp */
239 GET_VAL( &off, WORD );
240 base += (signed short)off;
241 break;
242 }
243 base &= 0xffff;
244 }
245 if (segprefix != -1) seg = segprefix;
246
247 /* Make sure the segment and offset are valid */
248 if (wine_ldt_is_system(seg)) return (BYTE *)(base + (index << ss));
249 if ((seg & 7) != 7) return NULL;
250 wine_ldt_get_entry( seg, &entry );
251 if (wine_ldt_is_empty( &entry )) return NULL;
252 if (wine_ldt_get_limit(&entry) < (base + (index << ss))) return NULL;
253 return (BYTE *)wine_ldt_get_base(&entry) + 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 an I/O port
340 */
341 static DWORD INSTR_inport( WORD port, int size, CONTEXT86 *context )
342 {
343 DWORD res = ~0U;
344
345 if (!winedos.inport) load_winedos();
346 if (winedos.inport) res = winedos.inport( port, size );
347
348 if (TRACE_ON(io))
349 {
350 switch(size)
351 {
352 case 1:
353 DPRINTF( "0x%x < %02x @ %04x:%04x\n", port, LOBYTE(res),
354 (WORD)context->SegCs, LOWORD(context->Eip));
355 break;
356 case 2:
357 DPRINTF( "0x%x < %04x @ %04x:%04x\n", port, LOWORD(res),
358 (WORD)context->SegCs, LOWORD(context->Eip));
359 break;
360 case 4:
361 DPRINTF( "0x%x < %08lx @ %04x:%04x\n", port, res,
362 (WORD)context->SegCs, LOWORD(context->Eip));
363 break;
364 }
365 }
366 return res;
367 }
368
369
370 /***********************************************************************
371 * INSTR_outport
372 *
373 * output on an I/O port
374 */
375 static void INSTR_outport( WORD port, int size, DWORD val, CONTEXT86 *context )
376 {
377 if (!winedos.outport) load_winedos();
378 if (winedos.outport) winedos.outport( port, size, val );
379
380 if (TRACE_ON(io))
381 {
382 switch(size)
383 {
384 case 1:
385 DPRINTF("0x%x > %02x @ %04x:%04x\n", port, LOBYTE(val),
386 (WORD)context->SegCs, LOWORD(context->Eip));
387 break;
388 case 2:
389 DPRINTF("0x%x > %04x @ %04x:%04x\n", port, LOWORD(val),
390 (WORD)context->SegCs, LOWORD(context->Eip));
391 break;
392 case 4:
393 DPRINTF("0x%x > %08lx @ %04x:%04x\n", port, val,
394 (WORD)context->SegCs, LOWORD(context->Eip));
395 break;
396 }
397 }
398 }
399
400
401 /***********************************************************************
402 * INSTR_EmulateInstruction
403 *
404 * Emulate a privileged instruction.
405 * Returns exception continuation status.
406 */
407 DWORD INSTR_EmulateInstruction( EXCEPTION_RECORD *rec, CONTEXT86 *context )
408 {
409 int prefix, segprefix, prefixlen, len, repX, long_op, long_addr;
410 BYTE *instr;
411
412 long_op = long_addr = (!ISV86(context) && IS_SELECTOR_32BIT(context->SegCs));
413 instr = make_ptr( context, context->SegCs, context->Eip, TRUE );
414 if (!instr) return ExceptionContinueSearch;
415
416 /* First handle any possible prefix */
417
418 segprefix = -1; /* no prefix */
419 prefix = 1;
420 repX = 0;
421 prefixlen = 0;
422 while(prefix)
423 {
424 switch(*instr)
425 {
426 case 0x2e:
427 segprefix = context->SegCs;
428 break;
429 case 0x36:
430 segprefix = context->SegSs;
431 break;
432 case 0x3e:
433 segprefix = context->SegDs;
434 break;
435 case 0x26:
436 segprefix = context->SegEs;
437 break;
438 case 0x64:
439 segprefix = context->SegFs;
440 break;
441 case 0x65:
442 segprefix = context->SegGs;
443 break;
444 case 0x66:
445 long_op = !long_op; /* opcode size prefix */
446 break;
447 case 0x67:
448 long_addr = !long_addr; /* addr size prefix */
449 break;
450 case 0xf0: /* lock */
451 break;
452 case 0xf2: /* repne */
453 repX = 1;
454 break;
455 case 0xf3: /* repe */
456 repX = 2;
457 break;
458 default:
459 prefix = 0; /* no more prefixes */
460 break;
461 }
462 if (prefix)
463 {
464 instr++;
465 prefixlen++;
466 }
467 }
468
469 /* Now look at the actual instruction */
470
471 switch(*instr)
472 {
473 case 0x07: /* pop es */
474 case 0x17: /* pop ss */
475 case 0x1f: /* pop ds */
476 {
477 WORD seg = *(WORD *)get_stack( context );
478 if (INSTR_ReplaceSelector( context, &seg ))
479 {
480 switch(*instr)
481 {
482 case 0x07: context->SegEs = seg; break;
483 case 0x17: context->SegSs = seg; break;
484 case 0x1f: context->SegDs = seg; break;
485 }
486 add_stack(context, long_op ? 4 : 2);
487 context->Eip += prefixlen + 1;
488 return ExceptionContinueExecution;
489 }
490 }
491 break; /* Unable to emulate it */
492
493 case 0x0f: /* extended instruction */
494 switch(instr[1])
495 {
496 case 0x22: /* mov eax, crX */
497 switch (instr[2])
498 {
499 case 0xc0:
500 ERR("mov eax,cr0 at 0x%08lx, EAX=0x%08lx\n",
501 context->Eip,context->Eax );
502 context->Eip += prefixlen+3;
503 return ExceptionContinueExecution;
504 default:
505 break; /*fallthrough to bad instruction handling */
506 }
507 break; /*fallthrough to bad instruction handling */
508 case 0x20: /* mov crX, eax */
509 switch (instr[2])
510 {
511 case 0xe0: /* mov cr4, eax */
512 /* CR4 register . See linux/arch/i386/mm/init.c, X86_CR4_ defs
513 * bit 0: VME Virtual Mode Exception ?
514 * bit 1: PVI Protected mode Virtual Interrupt
515 * bit 2: TSD Timestamp disable
516 * bit 3: DE Debugging extensions
517 * bit 4: PSE Page size extensions
518 * bit 5: PAE Physical address extension
519 * bit 6: MCE Machine check enable
520 * bit 7: PGE Enable global pages
521 * bit 8: PCE Enable performance counters at IPL3
522 */
523 ERR("mov cr4,eax at 0x%08lx\n",context->Eip);
524 context->Eax = 0;
525 context->Eip += prefixlen+3;
526 return ExceptionContinueExecution;
527 case 0xc0: /* mov cr0, eax */
528 ERR("mov cr0,eax at 0x%08lx\n",context->Eip);
529 context->Eax = 0x10; /* FIXME: set more bits ? */
530 context->Eip += prefixlen+3;
531 return ExceptionContinueExecution;
532 default: /* fallthrough to illegal instruction */
533 break;
534 }
535 /* fallthrough to illegal instruction */
536 break;
537 case 0x21: /* mov drX, eax */
538 switch (instr[2])
539 {
540 case 0xf8: /* mov dr7, eax */
541 TRACE("mov dr7,eax at 0x%08lx\n",context->Eip);
542 context->Eax = 0x400;
543 context->Eip += prefixlen+3;
544 return ExceptionContinueExecution;
545 default: /* fallthrough to illegal instruction */
546 ERR("Unknown DR register, eip+2 is %02x\n", instr[2]);
547 break;
548 }
549 /* fallthrough to illegal instruction */
550 break;
551 case 0xa1: /* pop fs */
552 {
553 WORD seg = *(WORD *)get_stack( context );
554 if (INSTR_ReplaceSelector( context, &seg ))
555 {
556 context->SegFs = seg;
557 add_stack(context, long_op ? 4 : 2);
558 context->Eip += prefixlen + 2;
559 return ExceptionContinueExecution;
560 }
561 }
562 break;
563 case 0xa9: /* pop gs */
564 {
565 WORD seg = *(WORD *)get_stack( context );
566 if (INSTR_ReplaceSelector( context, &seg ))
567 {
568 context->SegGs = seg;
569 add_stack(context, long_op ? 4 : 2);
570 context->Eip += prefixlen + 2;
571 return ExceptionContinueExecution;
572 }
573 }
574 break;
575 case 0xb2: /* lss addr,reg */
576 case 0xb4: /* lfs addr,reg */
577 case 0xb5: /* lgs addr,reg */
578 if (INSTR_EmulateLDS( context, instr, long_op,
579 long_addr, segprefix, &len ))
580 {
581 context->Eip += prefixlen + len;
582 return ExceptionContinueExecution;
583 }
584 break;
585 }
586 break; /* Unable to emulate it */
587
588 case 0x6c: /* insb */
589 case 0x6d: /* insw/d */
590 case 0x6e: /* outsb */
591 case 0x6f: /* outsw/d */
592 {
593 int typ = *instr; /* Just in case it's overwritten. */
594 int outp = (typ >= 0x6e);
595 unsigned long count = repX ?
596 (long_addr ? context->Ecx : LOWORD(context->Ecx)) : 1;
597 int opsize = (typ & 1) ? (long_op ? 4 : 2) : 1;
598 int step = (context->EFlags & 0x400) ? -opsize : +opsize;
599 int seg = outp ? context->SegDs : context->SegEs; /* FIXME: is this right? */
600
601 if (outp)
602 /* FIXME: Check segment readable. */
603 (void)0;
604 else
605 /* FIXME: Check segment writeable. */
606 (void)0;
607
608 if (repX)
609 {
610 if (long_addr) context->Ecx = 0;
611 else SET_LOWORD(context->Ecx,0);
612 }
613
614 while (count-- > 0)
615 {
616 void *data;
617 WORD dx = LOWORD(context->Edx);
618 if (outp)
619 {
620 data = make_ptr( context, seg, context->Esi, long_addr );
621 if (long_addr) context->Esi += step;
622 else ADD_LOWORD(context->Esi,step);
623 }
624 else
625 {
626 data = make_ptr( context, seg, context->Edi, long_addr );
627 if (long_addr) context->Edi += step;
628 else ADD_LOWORD(context->Edi,step);
629 }
630
631 switch (typ)
632 {
633 case 0x6c:
634 *(BYTE *)data = INSTR_inport( dx, 1, context );
635 break;
636 case 0x6d:
637 if (long_op)
638 *(DWORD *)data = INSTR_inport( dx, 4, context );
639 else
640 *(WORD *)data = INSTR_inport( dx, 2, context );
641 break;
642 case 0x6e:
643 INSTR_outport( dx, 1, *(BYTE *)data, context );
644 break;
645 case 0x6f:
646 if (long_op)
647 INSTR_outport( dx, 4, *(DWORD *)data, context );
648 else
649 INSTR_outport( dx, 2, *(WORD *)data, context );
650 break;
651 }
652 }
653 context->Eip += prefixlen + 1;
654 }
655 return ExceptionContinueExecution;
656
657 case 0x8e: /* mov XX,segment_reg */
658 {
659 WORD seg;
660 BYTE *addr = INSTR_GetOperandAddr(context, instr + 1,
661 long_addr, segprefix, &len );
662 if (!addr)
663 break; /* Unable to emulate it */
664 seg = *(WORD *)addr;
665 if (!INSTR_ReplaceSelector( context, &seg ))
666 break; /* Unable to emulate it */
667
668 switch((instr[1] >> 3) & 7)
669 {
670 case 0:
671 context->SegEs = seg;
672 context->Eip += prefixlen + len + 1;
673 return ExceptionContinueExecution;
674 case 1: /* cs */
675 break;
676 case 2:
677 context->SegSs = seg;
678 context->Eip += prefixlen + len + 1;
679 return ExceptionContinueExecution;
680 case 3:
681 context->SegDs = seg;
682 context->Eip += prefixlen + len + 1;
683 return ExceptionContinueExecution;
684 case 4:
685 context->SegFs = seg;
686 context->Eip += prefixlen + len + 1;
687 return ExceptionContinueExecution;
688 case 5:
689 context->SegGs = seg;
690 context->Eip += prefixlen + len + 1;
691 return ExceptionContinueExecution;
692 case 6: /* unused */
693 case 7: /* unused */
694 break;
695 }
696 }
697 break; /* Unable to emulate it */
698
699 case 0xc4: /* les addr,reg */
700 case 0xc5: /* lds addr,reg */
701 if (INSTR_EmulateLDS( context, instr, long_op,
702 long_addr, segprefix, &len ))
703 {
704 context->Eip += prefixlen + len;
705 return ExceptionContinueExecution;
706 }
707 break; /* Unable to emulate it */
708
709 case 0xcd: /* int <XX> */
710 if (wine_ldt_is_system(context->SegCs)) break; /* don't emulate it in 32-bit code */
711 if (!winedos.EmulateInterruptPM) load_winedos();
712 if (winedos.EmulateInterruptPM)
713 {
714 context->Eip += prefixlen + 2;
715 winedos.EmulateInterruptPM( context, instr[1] );
716 return ExceptionContinueExecution;
717 }
718 break; /* Unable to emulate it */
719
720 case 0xcf: /* iret */
721 if (wine_ldt_is_system(context->SegCs)) break; /* don't emulate it in 32-bit code */
722 if (long_op)
723 {
724 DWORD *stack = get_stack( context );
725 context->Eip = *stack++;
726 context->SegCs = *stack++;
727 context->EFlags = *stack;
728 add_stack(context, 3*sizeof(DWORD)); /* Pop the return address and flags */
729 }
730 else
731 {
732 WORD *stack = get_stack( context );
733 context->Eip = *stack++;
734 context->SegCs = *stack++;
735 SET_LOWORD(context->EFlags,*stack);
736 add_stack(context, 3*sizeof(WORD)); /* Pop the return address and flags */
737 }
738 return ExceptionContinueExecution;
739
740 case 0xe4: /* inb al,XX */
741 SET_LOBYTE(context->Eax,INSTR_inport( instr[1], 1, context ));
742 context->Eip += prefixlen + 2;
743 return ExceptionContinueExecution;
744
745 case 0xe5: /* in (e)ax,XX */
746 if (long_op)
747 context->Eax = INSTR_inport( instr[1], 4, context );
748 else
749 SET_LOWORD(context->Eax, INSTR_inport( instr[1], 2, context ));
750 context->Eip += prefixlen + 2;
751 return ExceptionContinueExecution;
752
753 case 0xe6: /* outb XX,al */
754 INSTR_outport( instr[1], 1, LOBYTE(context->Eax), context );
755 context->Eip += prefixlen + 2;
756 return ExceptionContinueExecution;
757
758 case 0xe7: /* out XX,(e)ax */
759 if (long_op)
760 INSTR_outport( instr[1], 4, context->Eax, context );
761 else
762 INSTR_outport( instr[1], 2, LOWORD(context->Eax), context );
763 context->Eip += prefixlen + 2;
764 return ExceptionContinueExecution;
765
766 case 0xec: /* inb al,dx */
767 SET_LOBYTE(context->Eax, INSTR_inport( LOWORD(context->Edx), 1, context ) );
768 context->Eip += prefixlen + 1;
769 return ExceptionContinueExecution;
770
771 case 0xed: /* in (e)ax,dx */
772 if (long_op)
773 context->Eax = INSTR_inport( LOWORD(context->Edx), 4, context );
774 else
775 SET_LOWORD(context->Eax, INSTR_inport( LOWORD(context->Edx), 2, context ));
776 context->Eip += prefixlen + 1;
777 return ExceptionContinueExecution;
778
779 case 0xee: /* outb dx,al */
780 INSTR_outport( LOWORD(context->Edx), 1, LOBYTE(context->Eax), context );
781 context->Eip += prefixlen + 1;
782 return ExceptionContinueExecution;
783
784 case 0xef: /* out dx,(e)ax */
785 if (long_op)
786 INSTR_outport( LOWORD(context->Edx), 4, context->Eax, context );
787 else
788 INSTR_outport( LOWORD(context->Edx), 2, LOWORD(context->Eax), context );
789 context->Eip += prefixlen + 1;
790 return ExceptionContinueExecution;
791
792 case 0xfa: /* cli */
793 NtCurrentTeb()->dpmi_vif = 0;
794 context->Eip += prefixlen + 1;
795 return ExceptionContinueExecution;
796
797 case 0xfb: /* sti */
798 NtCurrentTeb()->dpmi_vif = 1;
799 context->Eip += prefixlen + 1;
800 if (NtCurrentTeb()->vm86_pending)
801 {
802 NtCurrentTeb()->vm86_pending = 0;
803 rec->ExceptionCode = EXCEPTION_VM86_STI;
804 break; /* Handle the pending event. */
805 }
806 return ExceptionContinueExecution;
807 }
808 return ExceptionContinueSearch; /* Unable to emulate it */
809 }
810
811
812 /***********************************************************************
813 * INSTR_CallBuiltinHandler
814 */
815 void INSTR_CallBuiltinHandler( CONTEXT86 *context, BYTE intnum )
816 {
817 if (!winedos.CallBuiltinHandler) load_winedos();
818 if (winedos.CallBuiltinHandler) winedos.CallBuiltinHandler( context, intnum );
819 }
820
821
822 /***********************************************************************
823 * DOS3Call (KERNEL.102)
824 */
825 void WINAPI DOS3Call( CONTEXT86 *context )
826 {
827 INSTR_CallBuiltinHandler( context, 0x21 );
828 }
829
830
831 /***********************************************************************
832 * NetBIOSCall (KERNEL.103)
833 */
834 void WINAPI NetBIOSCall16( CONTEXT86 *context )
835 {
836 INSTR_CallBuiltinHandler( context, 0x5c );
837 }
838
839
840 /***********************************************************************
841 * GetSetKernelDOSProc (KERNEL.311)
842 */
843 FARPROC16 WINAPI GetSetKernelDOSProc16( FARPROC16 DosProc )
844 {
845 FIXME("(DosProc=0x%08x): stub\n", (UINT)DosProc);
846 return NULL;
847 }
GSOC 2012 project to enhance the control panel