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push 87b6981010d7405c33b14cddcceec21b47729eba
[wine/hacks.git] / dlls / krnl386.exe16 / instr.c
bloba1eb68c4a578587ae9a07b63b2c397cc7e18de26
1 /*
2 * Emulation of privileged instructions
3 *
4 * Copyright 1995 Alexandre Julliard
5 * Copyright 2005 Ivan Leo Puoti
6 * Copyright 2005 Laurent Pinchart
7 *
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
21 */
22
23 #include "config.h"
24 #include "wine/port.h"
25
26 #include <stdarg.h>
27
28 #include "windef.h"
29 #include "winbase.h"
30 #include "winternl.h"
31 #include "wine/winuser16.h"
32 #include "excpt.h"
33 #include "wine/debug.h"
34 #include "kernel16_private.h"
35 #include "dosexe.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 static inline 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 static inline 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 static inline 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 #include "pshpack1.h"
70 struct idtr
71 {
72 WORD limit;
73 BYTE *base;
74 };
75 #include "poppack.h"
76
77 static LDT_ENTRY idt[256];
78
79 static inline struct idtr get_idtr(void)
80 {
81 struct idtr ret;
82 #if defined(__i386__) && defined(__GNUC__)
83 __asm__( "sidtl %0" : "=m" (ret) );
84 #else
85 ret.base = (BYTE *)idt;
86 ret.limit = sizeof(idt) - 1;
87 #endif
88 return ret;
89 }
90
91
92 /***********************************************************************
93 * INSTR_ReplaceSelector
94 *
95 * Try to replace an invalid selector by a valid one.
96 * The only selector where it is allowed to do "mov ax,40;mov es,ax"
97 * is the so called 'bimodal' selector 0x40, which points to the BIOS
98 * data segment. Used by (at least) Borland products (and programs compiled
99 * using Borland products).
100 *
101 * See Undocumented Windows, Chapter 5, __0040.
102 */
103 static BOOL INSTR_ReplaceSelector( CONTEXT86 *context, WORD *sel )
104 {
105 if (*sel == 0x40)
106 {
107 DOSVM_start_bios_timer();
108 *sel = DOSMEM_BiosDataSeg;
109 return TRUE;
110 }
111 return FALSE; /* Can't replace selector, crashdump */
112 }
113
114
115 /* store an operand into a register */
116 static void store_reg( CONTEXT86 *context, BYTE regmodrm, const BYTE *addr, int long_op )
117 {
118 switch((regmodrm >> 3) & 7)
119 {
120 case 0:
121 if (long_op) context->Eax = *(const DWORD *)addr;
122 else SET_LOWORD(context->Eax, *(const WORD *)addr);
123 break;
124 case 1:
125 if (long_op) context->Ecx = *(const DWORD *)addr;
126 else SET_LOWORD(context->Ecx, *(const WORD *)addr);
127 break;
128 case 2:
129 if (long_op) context->Edx = *(const DWORD *)addr;
130 else SET_LOWORD(context->Edx, *(const WORD *)addr);
131 break;
132 case 3:
133 if (long_op) context->Ebx = *(const DWORD *)addr;
134 else SET_LOWORD(context->Ebx, *(const WORD *)addr);
135 break;
136 case 4:
137 if (long_op) context->Esp = *(const DWORD *)addr;
138 else SET_LOWORD(context->Esp, *(const WORD *)addr);
139 break;
140 case 5:
141 if (long_op) context->Ebp = *(const DWORD *)addr;
142 else SET_LOWORD(context->Ebp, *(const WORD *)addr);
143 break;
144 case 6:
145 if (long_op) context->Esi = *(const DWORD *)addr;
146 else SET_LOWORD(context->Esi, *(const WORD *)addr);
147 break;
148 case 7:
149 if (long_op) context->Edi = *(const DWORD *)addr;
150 else SET_LOWORD(context->Edi, *(const WORD *)addr);
151 break;
152 }
153 }
154
155 /***********************************************************************
156 * INSTR_GetOperandAddr
157 *
158 * Return the address of an instruction operand (from the mod/rm byte).
159 */
160 static BYTE *INSTR_GetOperandAddr( CONTEXT86 *context, BYTE *instr,
161 int long_addr, int segprefix, int *len )
162 {
163 int mod, rm, base = 0, index = 0, ss = 0, seg = 0, off;
164 LDT_ENTRY entry;
165
166 #define GET_VAL(val,type) \
167 { *val = *(type *)instr; instr += sizeof(type); *len += sizeof(type); }
168
169 *len = 0;
170 GET_VAL( &mod, BYTE );
171 rm = mod & 7;
172 mod >>= 6;
173
174 if (mod == 3)
175 {
176 switch(rm)
177 {
178 case 0: return (BYTE *)&context->Eax;
179 case 1: return (BYTE *)&context->Ecx;
180 case 2: return (BYTE *)&context->Edx;
181 case 3: return (BYTE *)&context->Ebx;
182 case 4: return (BYTE *)&context->Esp;
183 case 5: return (BYTE *)&context->Ebp;
184 case 6: return (BYTE *)&context->Esi;
185 case 7: return (BYTE *)&context->Edi;
186 }
187 }
188
189 if (long_addr)
190 {
191 if (rm == 4)
192 {
193 BYTE sib;
194 GET_VAL( &sib, BYTE );
195 rm = sib & 7;
196 ss = sib >> 6;
197 switch(sib >> 3)
198 {
199 case 0: index = context->Eax; break;
200 case 1: index = context->Ecx; break;
201 case 2: index = context->Edx; break;
202 case 3: index = context->Ebx; break;
203 case 4: index = 0; break;
204 case 5: index = context->Ebp; break;
205 case 6: index = context->Esi; break;
206 case 7: index = context->Edi; break;
207 }
208 }
209
210 switch(rm)
211 {
212 case 0: base = context->Eax; seg = context->SegDs; break;
213 case 1: base = context->Ecx; seg = context->SegDs; break;
214 case 2: base = context->Edx; seg = context->SegDs; break;
215 case 3: base = context->Ebx; seg = context->SegDs; break;
216 case 4: base = context->Esp; seg = context->SegSs; break;
217 case 5: base = context->Ebp; seg = context->SegSs; break;
218 case 6: base = context->Esi; seg = context->SegDs; break;
219 case 7: base = context->Edi; seg = context->SegDs; break;
220 }
221 switch (mod)
222 {
223 case 0:
224 if (rm == 5) /* special case: ds:(disp32) */
225 {
226 GET_VAL( &base, DWORD );
227 seg = context->SegDs;
228 }
229 break;
230
231 case 1: /* 8-bit disp */
232 GET_VAL( &off, BYTE );
233 base += (signed char)off;
234 break;
235
236 case 2: /* 32-bit disp */
237 GET_VAL( &off, DWORD );
238 base += (signed long)off;
239 break;
240 }
241 }
242 else /* short address */
243 {
244 switch(rm)
245 {
246 case 0: /* ds:(bx,si) */
247 base = LOWORD(context->Ebx) + LOWORD(context->Esi);
248 seg = context->SegDs;
249 break;
250 case 1: /* ds:(bx,di) */
251 base = LOWORD(context->Ebx) + LOWORD(context->Edi);
252 seg = context->SegDs;
253 break;
254 case 2: /* ss:(bp,si) */
255 base = LOWORD(context->Ebp) + LOWORD(context->Esi);
256 seg = context->SegSs;
257 break;
258 case 3: /* ss:(bp,di) */
259 base = LOWORD(context->Ebp) + LOWORD(context->Edi);
260 seg = context->SegSs;
261 break;
262 case 4: /* ds:(si) */
263 base = LOWORD(context->Esi);
264 seg = context->SegDs;
265 break;
266 case 5: /* ds:(di) */
267 base = LOWORD(context->Edi);
268 seg = context->SegDs;
269 break;
270 case 6: /* ss:(bp) */
271 base = LOWORD(context->Ebp);
272 seg = context->SegSs;
273 break;
274 case 7: /* ds:(bx) */
275 base = LOWORD(context->Ebx);
276 seg = context->SegDs;
277 break;
278 }
279
280 switch(mod)
281 {
282 case 0:
283 if (rm == 6) /* special case: ds:(disp16) */
284 {
285 GET_VAL( &base, WORD );
286 seg = context->SegDs;
287 }
288 break;
289
290 case 1: /* 8-bit disp */
291 GET_VAL( &off, BYTE );
292 base += (signed char)off;
293 break;
294
295 case 2: /* 16-bit disp */
296 GET_VAL( &off, WORD );
297 base += (signed short)off;
298 break;
299 }
300 base &= 0xffff;
301 }
302 if (segprefix != -1) seg = segprefix;
303
304 /* Make sure the segment and offset are valid */
305 if (wine_ldt_is_system(seg)) return (BYTE *)(base + (index << ss));
306 if ((seg & 7) != 7) return NULL;
307 wine_ldt_get_entry( seg, &entry );
308 if (wine_ldt_is_empty( &entry )) return NULL;
309 if (wine_ldt_get_limit(&entry) < (base + (index << ss))) return NULL;
310 return (BYTE *)wine_ldt_get_base(&entry) + base + (index << ss);
311 #undef GET_VAL
312 }
313
314
315 /***********************************************************************
316 * INSTR_EmulateLDS
317 *
318 * Emulate the LDS (and LES,LFS,etc.) instruction.
319 */
320 static BOOL INSTR_EmulateLDS( CONTEXT86 *context, BYTE *instr, int long_op,
321 int long_addr, int segprefix, int *len )
322 {
323 WORD seg;
324 BYTE *regmodrm = instr + 1 + (*instr == 0x0f);
325 BYTE *addr = INSTR_GetOperandAddr( context, regmodrm,
326 long_addr, segprefix, len );
327 if (!addr)
328 return FALSE; /* Unable to emulate it */
329 seg = *(WORD *)(addr + (long_op ? 4 : 2));
330
331 if (!INSTR_ReplaceSelector( context, &seg ))
332 return FALSE; /* Unable to emulate it */
333
334 /* Now store the offset in the correct register */
335
336 store_reg( context, *regmodrm, addr, long_op );
337
338 /* Store the correct segment in the segment register */
339
340 switch(*instr)
341 {
342 case 0xc4: context->SegEs = seg; break; /* les */
343 case 0xc5: context->SegDs = seg; break; /* lds */
344 case 0x0f: switch(instr[1])
345 {
346 case 0xb2: context->SegSs = seg; break; /* lss */
347 case 0xb4: context->SegFs = seg; break; /* lfs */
348 case 0xb5: context->SegGs = seg; break; /* lgs */
349 }
350 break;
351 }
352
353 /* Add the opcode size to the total length */
354
355 *len += 1 + (*instr == 0x0f);
356 return TRUE;
357 }
358
359 /***********************************************************************
360 * INSTR_inport
361 *
362 * input on an I/O port
363 */
364 static DWORD INSTR_inport( WORD port, int size, CONTEXT86 *context )
365 {
366 DWORD res = DOSVM_inport( port, size );
367
368 if (TRACE_ON(io))
369 {
370 switch(size)
371 {
372 case 1:
373 TRACE_(io)( "0x%x < %02x @ %04x:%04x\n", port, LOBYTE(res),
374 (WORD)context->SegCs, LOWORD(context->Eip));
375 break;
376 case 2:
377 TRACE_(io)( "0x%x < %04x @ %04x:%04x\n", port, LOWORD(res),
378 (WORD)context->SegCs, LOWORD(context->Eip));
379 break;
380 case 4:
381 TRACE_(io)( "0x%x < %08x @ %04x:%04x\n", port, res,
382 (WORD)context->SegCs, LOWORD(context->Eip));
383 break;
384 }
385 }
386 return res;
387 }
388
389
390 /***********************************************************************
391 * INSTR_outport
392 *
393 * output on an I/O port
394 */
395 static void INSTR_outport( WORD port, int size, DWORD val, CONTEXT86 *context )
396 {
397 DOSVM_outport( port, size, val );
398
399 if (TRACE_ON(io))
400 {
401 switch(size)
402 {
403 case 1:
404 TRACE_(io)("0x%x > %02x @ %04x:%04x\n", port, LOBYTE(val),
405 (WORD)context->SegCs, LOWORD(context->Eip));
406 break;
407 case 2:
408 TRACE_(io)("0x%x > %04x @ %04x:%04x\n", port, LOWORD(val),
409 (WORD)context->SegCs, LOWORD(context->Eip));
410 break;
411 case 4:
412 TRACE_(io)("0x%x > %08x @ %04x:%04x\n", port, val,
413 (WORD)context->SegCs, LOWORD(context->Eip));
414 break;
415 }
416 }
417 }
418
419
420 /***********************************************************************
421 * __wine_emulate_instruction
422 *
423 * Emulate a privileged instruction.
424 * Returns exception continuation status.
425 */
426 DWORD __wine_emulate_instruction( EXCEPTION_RECORD *rec, CONTEXT86 *context )
427 {
428 int prefix, segprefix, prefixlen, len, repX, long_op, long_addr;
429 BYTE *instr;
430
431 long_op = long_addr = (!ISV86(context) && IS_SELECTOR_32BIT(context->SegCs));
432 instr = make_ptr( context, context->SegCs, context->Eip, TRUE );
433 if (!instr) return ExceptionContinueSearch;
434
435 /* First handle any possible prefix */
436
437 segprefix = -1; /* no prefix */
438 prefix = 1;
439 repX = 0;
440 prefixlen = 0;
441 while(prefix)
442 {
443 switch(*instr)
444 {
445 case 0x2e:
446 segprefix = context->SegCs;
447 break;
448 case 0x36:
449 segprefix = context->SegSs;
450 break;
451 case 0x3e:
452 segprefix = context->SegDs;
453 break;
454 case 0x26:
455 segprefix = context->SegEs;
456 break;
457 case 0x64:
458 segprefix = context->SegFs;
459 break;
460 case 0x65:
461 segprefix = context->SegGs;
462 break;
463 case 0x66:
464 long_op = !long_op; /* opcode size prefix */
465 break;
466 case 0x67:
467 long_addr = !long_addr; /* addr size prefix */
468 break;
469 case 0xf0: /* lock */
470 break;
471 case 0xf2: /* repne */
472 repX = 1;
473 break;
474 case 0xf3: /* repe */
475 repX = 2;
476 break;
477 default:
478 prefix = 0; /* no more prefixes */
479 break;
480 }
481 if (prefix)
482 {
483 instr++;
484 prefixlen++;
485 }
486 }
487
488 /* Now look at the actual instruction */
489
490 switch(*instr)
491 {
492 case 0x07: /* pop es */
493 case 0x17: /* pop ss */
494 case 0x1f: /* pop ds */
495 {
496 WORD seg = *(WORD *)get_stack( context );
497 if (INSTR_ReplaceSelector( context, &seg ))
498 {
499 switch(*instr)
500 {
501 case 0x07: context->SegEs = seg; break;
502 case 0x17: context->SegSs = seg; break;
503 case 0x1f: context->SegDs = seg; break;
504 }
505 add_stack(context, long_op ? 4 : 2);
506 context->Eip += prefixlen + 1;
507 return ExceptionContinueExecution;
508 }
509 }
510 break; /* Unable to emulate it */
511
512 case 0x0f: /* extended instruction */
513 switch(instr[1])
514 {
515 case 0x22: /* mov eax, crX */
516 switch (instr[2])
517 {
518 case 0xc0:
519 ERR("mov eax,cr0 at 0x%08x, EAX=0x%08x\n",
520 context->Eip,context->Eax );
521 context->Eip += prefixlen+3;
522 return ExceptionContinueExecution;
523 default:
524 break; /*fallthrough to bad instruction handling */
525 }
526 break; /*fallthrough to bad instruction handling */
527 case 0x20: /* mov crX, eax */
528 switch (instr[2])
529 {
530 case 0xe0: /* mov cr4, eax */
531 /* CR4 register . See linux/arch/i386/mm/init.c, X86_CR4_ defs
532 * bit 0: VME Virtual Mode Exception ?
533 * bit 1: PVI Protected mode Virtual Interrupt
534 * bit 2: TSD Timestamp disable
535 * bit 3: DE Debugging extensions
536 * bit 4: PSE Page size extensions
537 * bit 5: PAE Physical address extension
538 * bit 6: MCE Machine check enable
539 * bit 7: PGE Enable global pages
540 * bit 8: PCE Enable performance counters at IPL3
541 */
542 ERR("mov cr4,eax at 0x%08x\n",context->Eip);
543 context->Eax = 0;
544 context->Eip += prefixlen+3;
545 return ExceptionContinueExecution;
546 case 0xc0: /* mov cr0, eax */
547 ERR("mov cr0,eax at 0x%08x\n",context->Eip);
548 context->Eax = 0x10; /* FIXME: set more bits ? */
549 context->Eip += prefixlen+3;
550 return ExceptionContinueExecution;
551 default: /* fallthrough to illegal instruction */
552 break;
553 }
554 /* fallthrough to illegal instruction */
555 break;
556 case 0x21: /* mov drX, eax */
557 switch (instr[2])
558 {
559 case 0xc8: /* mov dr1, eax */
560 TRACE("mov dr1,eax at 0x%08x\n",context->Eip);
561 context->Eax = context->Dr1;
562 context->Eip += prefixlen+3;
563 return ExceptionContinueExecution;
564 case 0xf8: /* mov dr7, eax */
565 TRACE("mov dr7,eax at 0x%08x\n",context->Eip);
566 context->Eax = 0x400;
567 context->Eip += prefixlen+3;
568 return ExceptionContinueExecution;
569 }
570 ERR("Unsupported DR register, eip+2 is %02x\n", instr[2]);
571 /* fallthrough to illegal instruction */
572 break;
573 case 0x23: /* mov eax drX */
574 switch (instr[2])
575 {
576 case 0xc8: /* mov eax, dr1 */
577 context->Dr1 = context->Eax;
578 context->Eip += prefixlen+3;
579 return ExceptionContinueExecution;
580 }
581 ERR("Unsupported DR register, eip+2 is %02x\n", instr[2]);
582 /* fallthrough to illegal instruction */
583 break;
584 case 0xa1: /* pop fs */
585 {
586 WORD seg = *(WORD *)get_stack( context );
587 if (INSTR_ReplaceSelector( context, &seg ))
588 {
589 context->SegFs = seg;
590 add_stack(context, long_op ? 4 : 2);
591 context->Eip += prefixlen + 2;
592 return ExceptionContinueExecution;
593 }
594 }
595 break;
596 case 0xa9: /* pop gs */
597 {
598 WORD seg = *(WORD *)get_stack( context );
599 if (INSTR_ReplaceSelector( context, &seg ))
600 {
601 context->SegGs = seg;
602 add_stack(context, long_op ? 4 : 2);
603 context->Eip += prefixlen + 2;
604 return ExceptionContinueExecution;
605 }
606 }
607 break;
608 case 0xb2: /* lss addr,reg */
609 case 0xb4: /* lfs addr,reg */
610 case 0xb5: /* lgs addr,reg */
611 if (INSTR_EmulateLDS( context, instr, long_op,
612 long_addr, segprefix, &len ))
613 {
614 context->Eip += prefixlen + len;
615 return ExceptionContinueExecution;
616 }
617 break;
618 }
619 break; /* Unable to emulate it */
620
621 case 0x6c: /* insb */
622 case 0x6d: /* insw/d */
623 case 0x6e: /* outsb */
624 case 0x6f: /* outsw/d */
625 {
626 int typ = *instr; /* Just in case it's overwritten. */
627 int outp = (typ >= 0x6e);
628 unsigned long count = repX ?
629 (long_addr ? context->Ecx : LOWORD(context->Ecx)) : 1;
630 int opsize = (typ & 1) ? (long_op ? 4 : 2) : 1;
631 int step = (context->EFlags & 0x400) ? -opsize : +opsize;
632 int seg = outp ? context->SegDs : context->SegEs; /* FIXME: is this right? */
633
634 if (outp)
635 /* FIXME: Check segment is readable. */
636 ;
637 else
638 /* FIXME: Check segment is writable. */
639 ;
640
641 if (repX)
642 {
643 if (long_addr) context->Ecx = 0;
644 else SET_LOWORD(context->Ecx,0);
645 }
646
647 while (count-- > 0)
648 {
649 void *data;
650 WORD dx = LOWORD(context->Edx);
651 if (outp)
652 {
653 data = make_ptr( context, seg, context->Esi, long_addr );
654 if (long_addr) context->Esi += step;
655 else ADD_LOWORD(context->Esi,step);
656 }
657 else
658 {
659 data = make_ptr( context, seg, context->Edi, long_addr );
660 if (long_addr) context->Edi += step;
661 else ADD_LOWORD(context->Edi,step);
662 }
663
664 switch (typ)
665 {
666 case 0x6c:
667 *(BYTE *)data = INSTR_inport( dx, 1, context );
668 break;
669 case 0x6d:
670 if (long_op)
671 *(DWORD *)data = INSTR_inport( dx, 4, context );
672 else
673 *(WORD *)data = INSTR_inport( dx, 2, context );
674 break;
675 case 0x6e:
676 INSTR_outport( dx, 1, *(BYTE *)data, context );
677 break;
678 case 0x6f:
679 if (long_op)
680 INSTR_outport( dx, 4, *(DWORD *)data, context );
681 else
682 INSTR_outport( dx, 2, *(WORD *)data, context );
683 break;
684 }
685 }
686 context->Eip += prefixlen + 1;
687 }
688 return ExceptionContinueExecution;
689
690 case 0x8b: /* mov Ev, Gv */
691 {
692 BYTE *addr = INSTR_GetOperandAddr(context, instr + 1, long_addr,
693 segprefix, &len);
694 struct idtr idtr = get_idtr();
695 unsigned int offset = addr - idtr.base;
696
697 if (offset <= idtr.limit + 1 - (long_op ? 4 : 2))
698 {
699 idt[1].LimitLow = 0x100; /* FIXME */
700 idt[2].LimitLow = 0x11E; /* FIXME */
701 idt[3].LimitLow = 0x500; /* FIXME */
702 store_reg( context, instr[1], (BYTE *)idt + offset, long_op );
703 context->Eip += prefixlen + len + 1;
704 return ExceptionContinueExecution;
705 }
706 }
707 break; /* Unable to emulate it */
708
709 case 0x8e: /* mov XX,segment_reg */
710 {
711 WORD seg;
712 BYTE *addr = INSTR_GetOperandAddr(context, instr + 1,
713 long_addr, segprefix, &len );
714 if (!addr)
715 break; /* Unable to emulate it */
716 seg = *(WORD *)addr;
717 if (!INSTR_ReplaceSelector( context, &seg ))
718 break; /* Unable to emulate it */
719
720 switch((instr[1] >> 3) & 7)
721 {
722 case 0:
723 context->SegEs = seg;
724 context->Eip += prefixlen + len + 1;
725 return ExceptionContinueExecution;
726 case 1: /* cs */
727 break;
728 case 2:
729 context->SegSs = seg;
730 context->Eip += prefixlen + len + 1;
731 return ExceptionContinueExecution;
732 case 3:
733 context->SegDs = seg;
734 context->Eip += prefixlen + len + 1;
735 return ExceptionContinueExecution;
736 case 4:
737 context->SegFs = seg;
738 context->Eip += prefixlen + len + 1;
739 return ExceptionContinueExecution;
740 case 5:
741 context->SegGs = seg;
742 context->Eip += prefixlen + len + 1;
743 return ExceptionContinueExecution;
744 case 6: /* unused */
745 case 7: /* unused */
746 break;
747 }
748 }
749 break; /* Unable to emulate it */
750
751 case 0xc4: /* les addr,reg */
752 case 0xc5: /* lds addr,reg */
753 if (INSTR_EmulateLDS( context, instr, long_op,
754 long_addr, segprefix, &len ))
755 {
756 context->Eip += prefixlen + len;
757 return ExceptionContinueExecution;
758 }
759 break; /* Unable to emulate it */
760
761 case 0xcd: /* int <XX> */
762 context->Eip += prefixlen + 2;
763 if (DOSVM_EmulateInterruptPM( context, instr[1] )) return ExceptionContinueExecution;
764 context->Eip -= prefixlen + 2; /* restore eip */
765 break; /* Unable to emulate it */
766
767 case 0xcf: /* iret */
768 if (wine_ldt_is_system(context->SegCs)) break; /* don't emulate it in 32-bit code */
769 if (long_op)
770 {
771 DWORD *stack = get_stack( context );
772 context->Eip = *stack++;
773 context->SegCs = *stack++;
774 context->EFlags = *stack;
775 add_stack(context, 3*sizeof(DWORD)); /* Pop the return address and flags */
776 }
777 else
778 {
779 WORD *stack = get_stack( context );
780 context->Eip = *stack++;
781 context->SegCs = *stack++;
782 SET_LOWORD(context->EFlags,*stack);
783 add_stack(context, 3*sizeof(WORD)); /* Pop the return address and flags */
784 }
785 return ExceptionContinueExecution;
786
787 case 0xe4: /* inb al,XX */
788 SET_LOBYTE(context->Eax,INSTR_inport( instr[1], 1, context ));
789 context->Eip += prefixlen + 2;
790 return ExceptionContinueExecution;
791
792 case 0xe5: /* in (e)ax,XX */
793 if (long_op)
794 context->Eax = INSTR_inport( instr[1], 4, context );
795 else
796 SET_LOWORD(context->Eax, INSTR_inport( instr[1], 2, context ));
797 context->Eip += prefixlen + 2;
798 return ExceptionContinueExecution;
799
800 case 0xe6: /* outb XX,al */
801 INSTR_outport( instr[1], 1, LOBYTE(context->Eax), context );
802 context->Eip += prefixlen + 2;
803 return ExceptionContinueExecution;
804
805 case 0xe7: /* out XX,(e)ax */
806 if (long_op)
807 INSTR_outport( instr[1], 4, context->Eax, context );
808 else
809 INSTR_outport( instr[1], 2, LOWORD(context->Eax), context );
810 context->Eip += prefixlen + 2;
811 return ExceptionContinueExecution;
812
813 case 0xec: /* inb al,dx */
814 SET_LOBYTE(context->Eax, INSTR_inport( LOWORD(context->Edx), 1, context ) );
815 context->Eip += prefixlen + 1;
816 return ExceptionContinueExecution;
817
818 case 0xed: /* in (e)ax,dx */
819 if (long_op)
820 context->Eax = INSTR_inport( LOWORD(context->Edx), 4, context );
821 else
822 SET_LOWORD(context->Eax, INSTR_inport( LOWORD(context->Edx), 2, context ));
823 context->Eip += prefixlen + 1;
824 return ExceptionContinueExecution;
825
826 case 0xee: /* outb dx,al */
827 INSTR_outport( LOWORD(context->Edx), 1, LOBYTE(context->Eax), context );
828 context->Eip += prefixlen + 1;
829 return ExceptionContinueExecution;
830
831 case 0xef: /* out dx,(e)ax */
832 if (long_op)
833 INSTR_outport( LOWORD(context->Edx), 4, context->Eax, context );
834 else
835 INSTR_outport( LOWORD(context->Edx), 2, LOWORD(context->Eax), context );
836 context->Eip += prefixlen + 1;
837 return ExceptionContinueExecution;
838
839 case 0xfa: /* cli */
840 get_vm86_teb_info()->dpmi_vif = 0;
841 context->Eip += prefixlen + 1;
842 return ExceptionContinueExecution;
843
844 case 0xfb: /* sti */
845 get_vm86_teb_info()->dpmi_vif = 1;
846 context->Eip += prefixlen + 1;
847 if (get_vm86_teb_info()->vm86_pending)
848 {
849 get_vm86_teb_info()->vm86_pending = 0;
850 rec->ExceptionCode = EXCEPTION_VM86_STI;
851 break; /* Handle the pending event. */
852 }
853 return ExceptionContinueExecution;
854 }
855 return ExceptionContinueSearch; /* Unable to emulate it */
856 }
857
858
859 /***********************************************************************
860 * INSTR_vectored_handler
861 *
862 * Vectored exception handler used to emulate protected instructions
863 * from 32-bit code.
864 */
865 LONG CALLBACK INSTR_vectored_handler( EXCEPTION_POINTERS *ptrs )
866 {
867 EXCEPTION_RECORD *record = ptrs->ExceptionRecord;
868 CONTEXT86 *context = ptrs->ContextRecord;
869
870 if (wine_ldt_is_system(context->SegCs) &&
871 (record->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
872 record->ExceptionCode == EXCEPTION_PRIV_INSTRUCTION))
873 {
874 if (__wine_emulate_instruction( record, context ) == ExceptionContinueExecution)
875 return EXCEPTION_CONTINUE_EXECUTION;
876 }
877 return EXCEPTION_CONTINUE_SEARCH;
878 }
879
880
881 /***********************************************************************
882 * DOS3Call (KERNEL.102)
883 */
884 void WINAPI DOS3Call( CONTEXT86 *context )
885 {
886 __wine_call_int_handler( context, 0x21 );
887 }
888
889
890 /***********************************************************************
891 * NetBIOSCall (KERNEL.103)
892 */
893 void WINAPI NetBIOSCall16( CONTEXT86 *context )
894 {
895 __wine_call_int_handler( context, 0x5c );
896 }
897
898
899 /***********************************************************************
900 * GetSetKernelDOSProc (KERNEL.311)
901 */
902 FARPROC16 WINAPI GetSetKernelDOSProc16( FARPROC16 DosProc )
903 {
904 FIXME("(DosProc=%p): stub\n", DosProc);
905 return NULL;
906 }
useful hacks and other patches not (yet) suitable for mainline