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winedbg: Properly manage Wine's dbghelp extensions for constant symbols which value...
[wine/wine-gecko.git] / dlls / kernel32 / instr.c
blob7f5ddc45dd71ba1e3f250e3947186f80541820b7
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 #ifdef __i386__
27
28 #include <stdarg.h>
29
30 #include "windef.h"
31 #include "winbase.h"
32 #include "winternl.h"
33 #include "wine/winuser16.h"
34 #include "excpt.h"
35 #include "wine/debug.h"
36 #include "kernel_private.h"
37 #include "kernel16_private.h"
38 #include "wine/exception.h"
39
40 WINE_DEFAULT_DEBUG_CHANNEL(int);
41 WINE_DECLARE_DEBUG_CHANNEL(io);
42
43 /* macros to set parts of a DWORD */
44 #define SET_LOWORD(dw,val) ((dw) = ((dw) & 0xffff0000) | LOWORD(val))
45 #define SET_LOBYTE(dw,val) ((dw) = ((dw) & 0xffffff00) | LOBYTE(val))
46 #define ADD_LOWORD(dw,val) ((dw) = ((dw) & 0xffff0000) | LOWORD((DWORD)(dw)+(val)))
47 #define ISV86(context) ((context)->EFlags & 0x00020000)
48
49 static inline void add_stack( CONTEXT86 *context, int offset )
50 {
51 if (ISV86(context) || !IS_SELECTOR_32BIT(context->SegSs))
52 ADD_LOWORD( context->Esp, offset );
53 else
54 context->Esp += offset;
55 }
56
57 static inline void *make_ptr( CONTEXT86 *context, DWORD seg, DWORD off, int long_addr )
58 {
59 if (ISV86(context)) return (void *)((seg << 4) + LOWORD(off));
60 if (wine_ldt_is_system(seg)) return (void *)off;
61 if (!long_addr) off = LOWORD(off);
62 return (char *) MapSL( MAKESEGPTR( seg, 0 ) ) + off;
63 }
64
65 static inline void *get_stack( CONTEXT86 *context )
66 {
67 if (ISV86(context)) return (void *)((context->SegSs << 4) + LOWORD(context->Esp));
68 return wine_ldt_get_ptr( context->SegSs, context->Esp );
69 }
70
71 #include "pshpack1.h"
72 struct idtr
73 {
74 WORD limit;
75 BYTE *base;
76 };
77 #include "poppack.h"
78
79 static LDT_ENTRY idt[256];
80
81 static inline struct idtr get_idtr(void)
82 {
83 struct idtr ret;
84 #if defined(__i386__) && defined(__GNUC__)
85 __asm__( "sidtl %0" : "=m" (ret) );
86 #else
87 ret.base = (BYTE *)idt;
88 ret.limit = sizeof(idt) - 1;
89 #endif
90 return ret;
91 }
92
93
94 /***********************************************************************
95 * INSTR_ReplaceSelector
96 *
97 * Try to replace an invalid selector by a valid one.
98 * The only selector where it is allowed to do "mov ax,40;mov es,ax"
99 * is the so called 'bimodal' selector 0x40, which points to the BIOS
100 * data segment. Used by (at least) Borland products (and programs compiled
101 * using Borland products).
102 *
103 * See Undocumented Windows, Chapter 5, __0040.
104 */
105 static BOOL INSTR_ReplaceSelector( CONTEXT86 *context, WORD *sel )
106 {
107 if (*sel == 0x40)
108 {
109 *sel = DOSMEM_BiosDataSeg;
110 return TRUE;
111 }
112 return FALSE; /* Can't replace selector, crashdump */
113 }
114
115
116 /* store an operand into a register */
117 static void store_reg( CONTEXT86 *context, BYTE regmodrm, const BYTE *addr, int long_op )
118 {
119 switch((regmodrm >> 3) & 7)
120 {
121 case 0:
122 if (long_op) context->Eax = *(const DWORD *)addr;
123 else SET_LOWORD(context->Eax, *(const WORD *)addr);
124 break;
125 case 1:
126 if (long_op) context->Ecx = *(const DWORD *)addr;
127 else SET_LOWORD(context->Ecx, *(const WORD *)addr);
128 break;
129 case 2:
130 if (long_op) context->Edx = *(const DWORD *)addr;
131 else SET_LOWORD(context->Edx, *(const WORD *)addr);
132 break;
133 case 3:
134 if (long_op) context->Ebx = *(const DWORD *)addr;
135 else SET_LOWORD(context->Ebx, *(const WORD *)addr);
136 break;
137 case 4:
138 if (long_op) context->Esp = *(const DWORD *)addr;
139 else SET_LOWORD(context->Esp, *(const WORD *)addr);
140 break;
141 case 5:
142 if (long_op) context->Ebp = *(const DWORD *)addr;
143 else SET_LOWORD(context->Ebp, *(const WORD *)addr);
144 break;
145 case 6:
146 if (long_op) context->Esi = *(const DWORD *)addr;
147 else SET_LOWORD(context->Esi, *(const WORD *)addr);
148 break;
149 case 7:
150 if (long_op) context->Edi = *(const DWORD *)addr;
151 else SET_LOWORD(context->Edi, *(const WORD *)addr);
152 break;
153 }
154 }
155
156 /***********************************************************************
157 * INSTR_GetOperandAddr
158 *
159 * Return the address of an instruction operand (from the mod/rm byte).
160 */
161 static BYTE *INSTR_GetOperandAddr( CONTEXT86 *context, BYTE *instr,
162 int long_addr, int segprefix, int *len )
163 {
164 int mod, rm, base = 0, index = 0, ss = 0, seg = 0, off;
165 LDT_ENTRY entry;
166
167 #define GET_VAL(val,type) \
168 { *val = *(type *)instr; instr += sizeof(type); *len += sizeof(type); }
169
170 *len = 0;
171 GET_VAL( &mod, BYTE );
172 rm = mod & 7;
173 mod >>= 6;
174
175 if (mod == 3)
176 {
177 switch(rm)
178 {
179 case 0: return (BYTE *)&context->Eax;
180 case 1: return (BYTE *)&context->Ecx;
181 case 2: return (BYTE *)&context->Edx;
182 case 3: return (BYTE *)&context->Ebx;
183 case 4: return (BYTE *)&context->Esp;
184 case 5: return (BYTE *)&context->Ebp;
185 case 6: return (BYTE *)&context->Esi;
186 case 7: return (BYTE *)&context->Edi;
187 }
188 }
189
190 if (long_addr)
191 {
192 if (rm == 4)
193 {
194 BYTE sib;
195 GET_VAL( &sib, BYTE );
196 rm = sib & 7;
197 ss = sib >> 6;
198 switch(sib >> 3)
199 {
200 case 0: index = context->Eax; break;
201 case 1: index = context->Ecx; break;
202 case 2: index = context->Edx; break;
203 case 3: index = context->Ebx; break;
204 case 4: index = 0; break;
205 case 5: index = context->Ebp; break;
206 case 6: index = context->Esi; break;
207 case 7: index = context->Edi; break;
208 }
209 }
210
211 switch(rm)
212 {
213 case 0: base = context->Eax; seg = context->SegDs; break;
214 case 1: base = context->Ecx; seg = context->SegDs; break;
215 case 2: base = context->Edx; seg = context->SegDs; break;
216 case 3: base = context->Ebx; seg = context->SegDs; break;
217 case 4: base = context->Esp; seg = context->SegSs; break;
218 case 5: base = context->Ebp; seg = context->SegSs; break;
219 case 6: base = context->Esi; seg = context->SegDs; break;
220 case 7: base = context->Edi; seg = context->SegDs; break;
221 }
222 switch (mod)
223 {
224 case 0:
225 if (rm == 5) /* special case: ds:(disp32) */
226 {
227 GET_VAL( &base, DWORD );
228 seg = context->SegDs;
229 }
230 break;
231
232 case 1: /* 8-bit disp */
233 GET_VAL( &off, BYTE );
234 base += (signed char)off;
235 break;
236
237 case 2: /* 32-bit disp */
238 GET_VAL( &off, DWORD );
239 base += (signed long)off;
240 break;
241 }
242 }
243 else /* short address */
244 {
245 switch(rm)
246 {
247 case 0: /* ds:(bx,si) */
248 base = LOWORD(context->Ebx) + LOWORD(context->Esi);
249 seg = context->SegDs;
250 break;
251 case 1: /* ds:(bx,di) */
252 base = LOWORD(context->Ebx) + LOWORD(context->Edi);
253 seg = context->SegDs;
254 break;
255 case 2: /* ss:(bp,si) */
256 base = LOWORD(context->Ebp) + LOWORD(context->Esi);
257 seg = context->SegSs;
258 break;
259 case 3: /* ss:(bp,di) */
260 base = LOWORD(context->Ebp) + LOWORD(context->Edi);
261 seg = context->SegSs;
262 break;
263 case 4: /* ds:(si) */
264 base = LOWORD(context->Esi);
265 seg = context->SegDs;
266 break;
267 case 5: /* ds:(di) */
268 base = LOWORD(context->Edi);
269 seg = context->SegDs;
270 break;
271 case 6: /* ss:(bp) */
272 base = LOWORD(context->Ebp);
273 seg = context->SegSs;
274 break;
275 case 7: /* ds:(bx) */
276 base = LOWORD(context->Ebx);
277 seg = context->SegDs;
278 break;
279 }
280
281 switch(mod)
282 {
283 case 0:
284 if (rm == 6) /* special case: ds:(disp16) */
285 {
286 GET_VAL( &base, WORD );
287 seg = context->SegDs;
288 }
289 break;
290
291 case 1: /* 8-bit disp */
292 GET_VAL( &off, BYTE );
293 base += (signed char)off;
294 break;
295
296 case 2: /* 16-bit disp */
297 GET_VAL( &off, WORD );
298 base += (signed short)off;
299 break;
300 }
301 base &= 0xffff;
302 }
303 if (segprefix != -1) seg = segprefix;
304
305 /* Make sure the segment and offset are valid */
306 if (wine_ldt_is_system(seg)) return (BYTE *)(base + (index << ss));
307 if ((seg & 7) != 7) return NULL;
308 wine_ldt_get_entry( seg, &entry );
309 if (wine_ldt_is_empty( &entry )) return NULL;
310 if (wine_ldt_get_limit(&entry) < (base + (index << ss))) return NULL;
311 return (BYTE *)wine_ldt_get_base(&entry) + base + (index << ss);
312 #undef GET_VAL
313 }
314
315
316 /***********************************************************************
317 * INSTR_EmulateLDS
318 *
319 * Emulate the LDS (and LES,LFS,etc.) instruction.
320 */
321 static BOOL INSTR_EmulateLDS( CONTEXT86 *context, BYTE *instr, int long_op,
322 int long_addr, int segprefix, int *len )
323 {
324 WORD seg;
325 BYTE *regmodrm = instr + 1 + (*instr == 0x0f);
326 BYTE *addr = INSTR_GetOperandAddr( context, regmodrm,
327 long_addr, segprefix, len );
328 if (!addr)
329 return FALSE; /* Unable to emulate it */
330 seg = *(WORD *)(addr + (long_op ? 4 : 2));
331
332 if (!INSTR_ReplaceSelector( context, &seg ))
333 return FALSE; /* Unable to emulate it */
334
335 /* Now store the offset in the correct register */
336
337 store_reg( context, *regmodrm, addr, long_op );
338
339 /* Store the correct segment in the segment register */
340
341 switch(*instr)
342 {
343 case 0xc4: context->SegEs = seg; break; /* les */
344 case 0xc5: context->SegDs = seg; break; /* lds */
345 case 0x0f: switch(instr[1])
346 {
347 case 0xb2: context->SegSs = seg; break; /* lss */
348 case 0xb4: context->SegFs = seg; break; /* lfs */
349 case 0xb5: context->SegGs = seg; break; /* lgs */
350 }
351 break;
352 }
353
354 /* Add the opcode size to the total length */
355
356 *len += 1 + (*instr == 0x0f);
357 return TRUE;
358 }
359
360 /***********************************************************************
361 * INSTR_inport
362 *
363 * input on an I/O port
364 */
365 static DWORD INSTR_inport( WORD port, int size, CONTEXT86 *context )
366 {
367 DWORD res = ~0U;
368
369 if (!winedos.inport) load_winedos();
370 if (winedos.inport) res = winedos.inport( port, size );
371
372 if (TRACE_ON(io))
373 {
374 switch(size)
375 {
376 case 1:
377 TRACE_(io)( "0x%x < %02x @ %04x:%04x\n", port, LOBYTE(res),
378 (WORD)context->SegCs, LOWORD(context->Eip));
379 break;
380 case 2:
381 TRACE_(io)( "0x%x < %04x @ %04x:%04x\n", port, LOWORD(res),
382 (WORD)context->SegCs, LOWORD(context->Eip));
383 break;
384 case 4:
385 TRACE_(io)( "0x%x < %08x @ %04x:%04x\n", port, res,
386 (WORD)context->SegCs, LOWORD(context->Eip));
387 break;
388 }
389 }
390 return res;
391 }
392
393
394 /***********************************************************************
395 * INSTR_outport
396 *
397 * output on an I/O port
398 */
399 static void INSTR_outport( WORD port, int size, DWORD val, CONTEXT86 *context )
400 {
401 if (!winedos.outport) load_winedos();
402 if (winedos.outport) winedos.outport( port, size, val );
403
404 if (TRACE_ON(io))
405 {
406 switch(size)
407 {
408 case 1:
409 TRACE_(io)("0x%x > %02x @ %04x:%04x\n", port, LOBYTE(val),
410 (WORD)context->SegCs, LOWORD(context->Eip));
411 break;
412 case 2:
413 TRACE_(io)("0x%x > %04x @ %04x:%04x\n", port, LOWORD(val),
414 (WORD)context->SegCs, LOWORD(context->Eip));
415 break;
416 case 4:
417 TRACE_(io)("0x%x > %08x @ %04x:%04x\n", port, val,
418 (WORD)context->SegCs, LOWORD(context->Eip));
419 break;
420 }
421 }
422 }
423
424
425 /***********************************************************************
426 * __wine_emulate_instruction
427 *
428 * Emulate a privileged instruction.
429 * Returns exception continuation status.
430 */
431 DWORD __wine_emulate_instruction( EXCEPTION_RECORD *rec, CONTEXT86 *context )
432 {
433 int prefix, segprefix, prefixlen, len, repX, long_op, long_addr;
434 BYTE *instr;
435
436 long_op = long_addr = (!ISV86(context) && IS_SELECTOR_32BIT(context->SegCs));
437 instr = make_ptr( context, context->SegCs, context->Eip, TRUE );
438 if (!instr) return ExceptionContinueSearch;
439
440 /* First handle any possible prefix */
441
442 segprefix = -1; /* no prefix */
443 prefix = 1;
444 repX = 0;
445 prefixlen = 0;
446 while(prefix)
447 {
448 switch(*instr)
449 {
450 case 0x2e:
451 segprefix = context->SegCs;
452 break;
453 case 0x36:
454 segprefix = context->SegSs;
455 break;
456 case 0x3e:
457 segprefix = context->SegDs;
458 break;
459 case 0x26:
460 segprefix = context->SegEs;
461 break;
462 case 0x64:
463 segprefix = context->SegFs;
464 break;
465 case 0x65:
466 segprefix = context->SegGs;
467 break;
468 case 0x66:
469 long_op = !long_op; /* opcode size prefix */
470 break;
471 case 0x67:
472 long_addr = !long_addr; /* addr size prefix */
473 break;
474 case 0xf0: /* lock */
475 break;
476 case 0xf2: /* repne */
477 repX = 1;
478 break;
479 case 0xf3: /* repe */
480 repX = 2;
481 break;
482 default:
483 prefix = 0; /* no more prefixes */
484 break;
485 }
486 if (prefix)
487 {
488 instr++;
489 prefixlen++;
490 }
491 }
492
493 /* Now look at the actual instruction */
494
495 switch(*instr)
496 {
497 case 0x07: /* pop es */
498 case 0x17: /* pop ss */
499 case 0x1f: /* pop ds */
500 {
501 WORD seg = *(WORD *)get_stack( context );
502 if (INSTR_ReplaceSelector( context, &seg ))
503 {
504 switch(*instr)
505 {
506 case 0x07: context->SegEs = seg; break;
507 case 0x17: context->SegSs = seg; break;
508 case 0x1f: context->SegDs = seg; break;
509 }
510 add_stack(context, long_op ? 4 : 2);
511 context->Eip += prefixlen + 1;
512 return ExceptionContinueExecution;
513 }
514 }
515 break; /* Unable to emulate it */
516
517 case 0x0f: /* extended instruction */
518 switch(instr[1])
519 {
520 case 0x22: /* mov eax, crX */
521 switch (instr[2])
522 {
523 case 0xc0:
524 ERR("mov eax,cr0 at 0x%08x, EAX=0x%08x\n",
525 context->Eip,context->Eax );
526 context->Eip += prefixlen+3;
527 return ExceptionContinueExecution;
528 default:
529 break; /*fallthrough to bad instruction handling */
530 }
531 break; /*fallthrough to bad instruction handling */
532 case 0x20: /* mov crX, eax */
533 switch (instr[2])
534 {
535 case 0xe0: /* mov cr4, eax */
536 /* CR4 register . See linux/arch/i386/mm/init.c, X86_CR4_ defs
537 * bit 0: VME Virtual Mode Exception ?
538 * bit 1: PVI Protected mode Virtual Interrupt
539 * bit 2: TSD Timestamp disable
540 * bit 3: DE Debugging extensions
541 * bit 4: PSE Page size extensions
542 * bit 5: PAE Physical address extension
543 * bit 6: MCE Machine check enable
544 * bit 7: PGE Enable global pages
545 * bit 8: PCE Enable performance counters at IPL3
546 */
547 ERR("mov cr4,eax at 0x%08x\n",context->Eip);
548 context->Eax = 0;
549 context->Eip += prefixlen+3;
550 return ExceptionContinueExecution;
551 case 0xc0: /* mov cr0, eax */
552 ERR("mov cr0,eax at 0x%08x\n",context->Eip);
553 context->Eax = 0x10; /* FIXME: set more bits ? */
554 context->Eip += prefixlen+3;
555 return ExceptionContinueExecution;
556 default: /* fallthrough to illegal instruction */
557 break;
558 }
559 /* fallthrough to illegal instruction */
560 break;
561 case 0x21: /* mov drX, eax */
562 switch (instr[2])
563 {
564 case 0xc8: /* mov dr1, eax */
565 TRACE("mov dr1,eax at 0x%08x\n",context->Eip);
566 context->Eax = context->Dr1;
567 context->Eip += prefixlen+3;
568 return ExceptionContinueExecution;
569 case 0xf8: /* mov dr7, eax */
570 TRACE("mov dr7,eax at 0x%08x\n",context->Eip);
571 context->Eax = 0x400;
572 context->Eip += prefixlen+3;
573 return ExceptionContinueExecution;
574 }
575 ERR("Unsupported DR register, eip+2 is %02x\n", instr[2]);
576 /* fallthrough to illegal instruction */
577 break;
578 case 0x23: /* mov eax drX */
579 switch (instr[2])
580 {
581 case 0xc8: /* mov eax, dr1 */
582 context->Dr1 = context->Eax;
583 context->Eip += prefixlen+3;
584 return ExceptionContinueExecution;
585 }
586 ERR("Unsupported DR register, eip+2 is %02x\n", instr[2]);
587 /* fallthrough to illegal instruction */
588 break;
589 case 0xa1: /* pop fs */
590 {
591 WORD seg = *(WORD *)get_stack( context );
592 if (INSTR_ReplaceSelector( context, &seg ))
593 {
594 context->SegFs = seg;
595 add_stack(context, long_op ? 4 : 2);
596 context->Eip += prefixlen + 2;
597 return ExceptionContinueExecution;
598 }
599 }
600 break;
601 case 0xa9: /* pop gs */
602 {
603 WORD seg = *(WORD *)get_stack( context );
604 if (INSTR_ReplaceSelector( context, &seg ))
605 {
606 context->SegGs = seg;
607 add_stack(context, long_op ? 4 : 2);
608 context->Eip += prefixlen + 2;
609 return ExceptionContinueExecution;
610 }
611 }
612 break;
613 case 0xb2: /* lss addr,reg */
614 case 0xb4: /* lfs addr,reg */
615 case 0xb5: /* lgs addr,reg */
616 if (INSTR_EmulateLDS( context, instr, long_op,
617 long_addr, segprefix, &len ))
618 {
619 context->Eip += prefixlen + len;
620 return ExceptionContinueExecution;
621 }
622 break;
623 }
624 break; /* Unable to emulate it */
625
626 case 0x6c: /* insb */
627 case 0x6d: /* insw/d */
628 case 0x6e: /* outsb */
629 case 0x6f: /* outsw/d */
630 {
631 int typ = *instr; /* Just in case it's overwritten. */
632 int outp = (typ >= 0x6e);
633 unsigned long count = repX ?
634 (long_addr ? context->Ecx : LOWORD(context->Ecx)) : 1;
635 int opsize = (typ & 1) ? (long_op ? 4 : 2) : 1;
636 int step = (context->EFlags & 0x400) ? -opsize : +opsize;
637 int seg = outp ? context->SegDs : context->SegEs; /* FIXME: is this right? */
638
639 if (outp)
640 /* FIXME: Check segment is readable. */
641 ;
642 else
643 /* FIXME: Check segment is writable. */
644 ;
645
646 if (repX)
647 {
648 if (long_addr) context->Ecx = 0;
649 else SET_LOWORD(context->Ecx,0);
650 }
651
652 while (count-- > 0)
653 {
654 void *data;
655 WORD dx = LOWORD(context->Edx);
656 if (outp)
657 {
658 data = make_ptr( context, seg, context->Esi, long_addr );
659 if (long_addr) context->Esi += step;
660 else ADD_LOWORD(context->Esi,step);
661 }
662 else
663 {
664 data = make_ptr( context, seg, context->Edi, long_addr );
665 if (long_addr) context->Edi += step;
666 else ADD_LOWORD(context->Edi,step);
667 }
668
669 switch (typ)
670 {
671 case 0x6c:
672 *(BYTE *)data = INSTR_inport( dx, 1, context );
673 break;
674 case 0x6d:
675 if (long_op)
676 *(DWORD *)data = INSTR_inport( dx, 4, context );
677 else
678 *(WORD *)data = INSTR_inport( dx, 2, context );
679 break;
680 case 0x6e:
681 INSTR_outport( dx, 1, *(BYTE *)data, context );
682 break;
683 case 0x6f:
684 if (long_op)
685 INSTR_outport( dx, 4, *(DWORD *)data, context );
686 else
687 INSTR_outport( dx, 2, *(WORD *)data, context );
688 break;
689 }
690 }
691 context->Eip += prefixlen + 1;
692 }
693 return ExceptionContinueExecution;
694
695 case 0x8b: /* mov Ev, Gv */
696 {
697 BYTE *addr = INSTR_GetOperandAddr(context, instr + 1, long_addr,
698 segprefix, &len);
699 struct idtr idtr = get_idtr();
700 unsigned int offset = addr - idtr.base;
701
702 if (offset <= idtr.limit + 1 - (long_op ? 4 : 2))
703 {
704 idt[1].LimitLow = 0x100; /* FIXME */
705 idt[2].LimitLow = 0x11E; /* FIXME */
706 idt[3].LimitLow = 0x500; /* FIXME */
707 store_reg( context, instr[1], (BYTE *)idt + offset, long_op );
708 context->Eip += prefixlen + len + 1;
709 return ExceptionContinueExecution;
710 }
711 }
712 break; /* Unable to emulate it */
713
714 case 0x8e: /* mov XX,segment_reg */
715 {
716 WORD seg;
717 BYTE *addr = INSTR_GetOperandAddr(context, instr + 1,
718 long_addr, segprefix, &len );
719 if (!addr)
720 break; /* Unable to emulate it */
721 seg = *(WORD *)addr;
722 if (!INSTR_ReplaceSelector( context, &seg ))
723 break; /* Unable to emulate it */
724
725 switch((instr[1] >> 3) & 7)
726 {
727 case 0:
728 context->SegEs = seg;
729 context->Eip += prefixlen + len + 1;
730 return ExceptionContinueExecution;
731 case 1: /* cs */
732 break;
733 case 2:
734 context->SegSs = seg;
735 context->Eip += prefixlen + len + 1;
736 return ExceptionContinueExecution;
737 case 3:
738 context->SegDs = seg;
739 context->Eip += prefixlen + len + 1;
740 return ExceptionContinueExecution;
741 case 4:
742 context->SegFs = seg;
743 context->Eip += prefixlen + len + 1;
744 return ExceptionContinueExecution;
745 case 5:
746 context->SegGs = seg;
747 context->Eip += prefixlen + len + 1;
748 return ExceptionContinueExecution;
749 case 6: /* unused */
750 case 7: /* unused */
751 break;
752 }
753 }
754 break; /* Unable to emulate it */
755
756 case 0xc4: /* les addr,reg */
757 case 0xc5: /* lds addr,reg */
758 if (INSTR_EmulateLDS( context, instr, long_op,
759 long_addr, segprefix, &len ))
760 {
761 context->Eip += prefixlen + len;
762 return ExceptionContinueExecution;
763 }
764 break; /* Unable to emulate it */
765
766 case 0xcd: /* int <XX> */
767 if (!winedos.EmulateInterruptPM) load_winedos();
768 if (winedos.EmulateInterruptPM)
769 {
770 context->Eip += prefixlen + 2;
771 if (winedos.EmulateInterruptPM( context, instr[1] )) return ExceptionContinueExecution;
772 context->Eip -= prefixlen + 2; /* restore eip */
773 }
774 break; /* Unable to emulate it */
775
776 case 0xcf: /* iret */
777 if (wine_ldt_is_system(context->SegCs)) break; /* don't emulate it in 32-bit code */
778 if (long_op)
779 {
780 DWORD *stack = get_stack( context );
781 context->Eip = *stack++;
782 context->SegCs = *stack++;
783 context->EFlags = *stack;
784 add_stack(context, 3*sizeof(DWORD)); /* Pop the return address and flags */
785 }
786 else
787 {
788 WORD *stack = get_stack( context );
789 context->Eip = *stack++;
790 context->SegCs = *stack++;
791 SET_LOWORD(context->EFlags,*stack);
792 add_stack(context, 3*sizeof(WORD)); /* Pop the return address and flags */
793 }
794 return ExceptionContinueExecution;
795
796 case 0xe4: /* inb al,XX */
797 SET_LOBYTE(context->Eax,INSTR_inport( instr[1], 1, context ));
798 context->Eip += prefixlen + 2;
799 return ExceptionContinueExecution;
800
801 case 0xe5: /* in (e)ax,XX */
802 if (long_op)
803 context->Eax = INSTR_inport( instr[1], 4, context );
804 else
805 SET_LOWORD(context->Eax, INSTR_inport( instr[1], 2, context ));
806 context->Eip += prefixlen + 2;
807 return ExceptionContinueExecution;
808
809 case 0xe6: /* outb XX,al */
810 INSTR_outport( instr[1], 1, LOBYTE(context->Eax), context );
811 context->Eip += prefixlen + 2;
812 return ExceptionContinueExecution;
813
814 case 0xe7: /* out XX,(e)ax */
815 if (long_op)
816 INSTR_outport( instr[1], 4, context->Eax, context );
817 else
818 INSTR_outport( instr[1], 2, LOWORD(context->Eax), context );
819 context->Eip += prefixlen + 2;
820 return ExceptionContinueExecution;
821
822 case 0xec: /* inb al,dx */
823 SET_LOBYTE(context->Eax, INSTR_inport( LOWORD(context->Edx), 1, context ) );
824 context->Eip += prefixlen + 1;
825 return ExceptionContinueExecution;
826
827 case 0xed: /* in (e)ax,dx */
828 if (long_op)
829 context->Eax = INSTR_inport( LOWORD(context->Edx), 4, context );
830 else
831 SET_LOWORD(context->Eax, INSTR_inport( LOWORD(context->Edx), 2, context ));
832 context->Eip += prefixlen + 1;
833 return ExceptionContinueExecution;
834
835 case 0xee: /* outb dx,al */
836 INSTR_outport( LOWORD(context->Edx), 1, LOBYTE(context->Eax), context );
837 context->Eip += prefixlen + 1;
838 return ExceptionContinueExecution;
839
840 case 0xef: /* out dx,(e)ax */
841 if (long_op)
842 INSTR_outport( LOWORD(context->Edx), 4, context->Eax, context );
843 else
844 INSTR_outport( LOWORD(context->Edx), 2, LOWORD(context->Eax), context );
845 context->Eip += prefixlen + 1;
846 return ExceptionContinueExecution;
847
848 case 0xfa: /* cli */
849 get_vm86_teb_info()->dpmi_vif = 0;
850 context->Eip += prefixlen + 1;
851 return ExceptionContinueExecution;
852
853 case 0xfb: /* sti */
854 get_vm86_teb_info()->dpmi_vif = 1;
855 context->Eip += prefixlen + 1;
856 if (get_vm86_teb_info()->vm86_pending)
857 {
858 get_vm86_teb_info()->vm86_pending = 0;
859 rec->ExceptionCode = EXCEPTION_VM86_STI;
860 break; /* Handle the pending event. */
861 }
862 return ExceptionContinueExecution;
863 }
864 return ExceptionContinueSearch; /* Unable to emulate it */
865 }
866
867
868 /***********************************************************************
869 * INSTR_vectored_handler
870 *
871 * Vectored exception handler used to emulate protected instructions
872 * from 32-bit code.
873 */
874 LONG CALLBACK INSTR_vectored_handler( EXCEPTION_POINTERS *ptrs )
875 {
876 EXCEPTION_RECORD *record = ptrs->ExceptionRecord;
877 CONTEXT86 *context = ptrs->ContextRecord;
878
879 if (wine_ldt_is_system(context->SegCs) &&
880 (record->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
881 record->ExceptionCode == EXCEPTION_PRIV_INSTRUCTION))
882 {
883 if (__wine_emulate_instruction( record, context ) == ExceptionContinueExecution)
884 return EXCEPTION_CONTINUE_EXECUTION;
885 }
886 return EXCEPTION_CONTINUE_SEARCH;
887 }
888
889
890 /***********************************************************************
891 * INSTR_CallBuiltinHandler
892 */
893 static void INSTR_CallBuiltinHandler( CONTEXT86 *context, BYTE intnum )
894 {
895 if (!winedos.CallBuiltinHandler) load_winedos();
896 if (winedos.CallBuiltinHandler) winedos.CallBuiltinHandler( context, intnum );
897 }
898
899
900 /***********************************************************************
901 * DOS3Call (KERNEL.102)
902 */
903 void WINAPI DOS3Call( CONTEXT86 *context )
904 {
905 INSTR_CallBuiltinHandler( context, 0x21 );
906 }
907
908
909 /***********************************************************************
910 * NetBIOSCall (KERNEL.103)
911 */
912 void WINAPI NetBIOSCall16( CONTEXT86 *context )
913 {
914 INSTR_CallBuiltinHandler( context, 0x5c );
915 }
916
917
918 /***********************************************************************
919 * GetSetKernelDOSProc (KERNEL.311)
920 */
921 FARPROC16 WINAPI GetSetKernelDOSProc16( FARPROC16 DosProc )
922 {
923 FIXME("(DosProc=%p): stub\n", DosProc);
924 return NULL;
925 }
926
927 #endif /* __i386__ */
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