?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
ntdll: Use a separate memory allocation for the kernel stack.
[wine.git] / dlls / krnl386.exe16 / instr.c
blobb21a00d5ccf0508501986502de97874ba066dc1e
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 <stdarg.h>
24
25 #include "windef.h"
26 #include "winbase.h"
27 #include "winternl.h"
28 #include "wine/winuser16.h"
29 #include "excpt.h"
30 #include "wine/debug.h"
31 #include "kernel16_private.h"
32 #include "dosexe.h"
33
34 WINE_DEFAULT_DEBUG_CHANNEL(int);
35 WINE_DECLARE_DEBUG_CHANNEL(io);
36
37 /* macros to set parts of a DWORD */
38 #define SET_LOWORD(dw,val) ((dw) = ((dw) & 0xffff0000) | LOWORD(val))
39 #define SET_LOBYTE(dw,val) ((dw) = ((dw) & 0xffffff00) | LOBYTE(val))
40 #define ADD_LOWORD(dw,val) ((dw) = ((dw) & 0xffff0000) | LOWORD((DWORD)(dw)+(val)))
41
42 static inline void add_stack( CONTEXT *context, int offset )
43 {
44 if (!IS_SELECTOR_32BIT(context->SegSs))
45 ADD_LOWORD( context->Esp, offset );
46 else
47 context->Esp += offset;
48 }
49
50 static inline void *make_ptr( CONTEXT *context, DWORD seg, DWORD off, int long_addr )
51 {
52 if (ldt_is_system(seg)) return (void *)off;
53 if (!long_addr) off = LOWORD(off);
54 return (char *) MapSL( MAKESEGPTR( seg, 0 ) ) + off;
55 }
56
57 static inline void *get_stack( CONTEXT *context )
58 {
59 return ldt_get_ptr( context->SegSs, context->Esp );
60 }
61
62 #include "pshpack1.h"
63 struct idtr
64 {
65 WORD limit;
66 BYTE *base;
67 };
68 #include "poppack.h"
69
70 static LDT_ENTRY idt[256];
71
72 static inline struct idtr get_idtr(void)
73 {
74 struct idtr ret;
75 #if defined(__i386__) && defined(__GNUC__)
76 __asm__( "sidtl %0" : "=m" (ret) );
77 #else
78 ret.base = (BYTE *)idt;
79 ret.limit = sizeof(idt) - 1;
80 #endif
81 return ret;
82 }
83
84
85 /***********************************************************************
86 * INSTR_ReplaceSelector
87 *
88 * Try to replace an invalid selector by a valid one.
89 * The only selector where it is allowed to do "mov ax,40;mov es,ax"
90 * is the so called 'bimodal' selector 0x40, which points to the BIOS
91 * data segment. Used by (at least) Borland products (and programs compiled
92 * using Borland products).
93 *
94 * See Undocumented Windows, Chapter 5, __0040.
95 */
96 static BOOL INSTR_ReplaceSelector( CONTEXT *context, WORD *sel )
97 {
98 if (*sel == 0x40)
99 {
100 DOSVM_start_bios_timer();
101 *sel = DOSMEM_BiosDataSeg;
102 return TRUE;
103 }
104 return FALSE; /* Can't replace selector, crashdump */
105 }
106
107
108 /* store an operand into a register */
109 static void store_reg_word( CONTEXT *context, BYTE regmodrm, const BYTE *addr, int long_op )
110 {
111 switch((regmodrm >> 3) & 7)
112 {
113 case 0:
114 if (long_op) context->Eax = *(const DWORD *)addr;
115 else SET_LOWORD(context->Eax, *(const WORD *)addr);
116 break;
117 case 1:
118 if (long_op) context->Ecx = *(const DWORD *)addr;
119 else SET_LOWORD(context->Ecx, *(const WORD *)addr);
120 break;
121 case 2:
122 if (long_op) context->Edx = *(const DWORD *)addr;
123 else SET_LOWORD(context->Edx, *(const WORD *)addr);
124 break;
125 case 3:
126 if (long_op) context->Ebx = *(const DWORD *)addr;
127 else SET_LOWORD(context->Ebx, *(const WORD *)addr);
128 break;
129 case 4:
130 if (long_op) context->Esp = *(const DWORD *)addr;
131 else SET_LOWORD(context->Esp, *(const WORD *)addr);
132 break;
133 case 5:
134 if (long_op) context->Ebp = *(const DWORD *)addr;
135 else SET_LOWORD(context->Ebp, *(const WORD *)addr);
136 break;
137 case 6:
138 if (long_op) context->Esi = *(const DWORD *)addr;
139 else SET_LOWORD(context->Esi, *(const WORD *)addr);
140 break;
141 case 7:
142 if (long_op) context->Edi = *(const DWORD *)addr;
143 else SET_LOWORD(context->Edi, *(const WORD *)addr);
144 break;
145 }
146 }
147
148 /* store an operand into a byte register */
149 static void store_reg_byte( CONTEXT *context, BYTE regmodrm, const BYTE *addr )
150 {
151 switch((regmodrm >> 3) & 7)
152 {
153 case 0: context->Eax = (context->Eax & 0xffffff00) | *addr; break;
154 case 1: context->Ecx = (context->Ecx & 0xffffff00) | *addr; break;
155 case 2: context->Edx = (context->Edx & 0xffffff00) | *addr; break;
156 case 3: context->Ebx = (context->Ebx & 0xffffff00) | *addr; break;
157 case 4: context->Eax = (context->Eax & 0xffff00ff) | (*addr << 8); break;
158 case 5: context->Ecx = (context->Ecx & 0xffff00ff) | (*addr << 8); break;
159 case 6: context->Edx = (context->Edx & 0xffff00ff) | (*addr << 8); break;
160 case 7: context->Ebx = (context->Ebx & 0xffff00ff) | (*addr << 8); break;
161 }
162 }
163
164 /***********************************************************************
165 * INSTR_GetOperandAddr
166 *
167 * Return the address of an instruction operand (from the mod/rm byte).
168 */
169 static BYTE *INSTR_GetOperandAddr( CONTEXT *context, BYTE *instr,
170 int long_addr, int segprefix, int *len )
171 {
172 int mod, rm, base = 0, index = 0, ss = 0, seg = 0, off;
173
174 #define GET_VAL(val,type) \
175 { *val = *(type *)instr; instr += sizeof(type); *len += sizeof(type); }
176
177 *len = 0;
178 GET_VAL( &mod, BYTE );
179 rm = mod & 7;
180 mod >>= 6;
181
182 if (mod == 3)
183 {
184 switch(rm)
185 {
186 case 0: return (BYTE *)&context->Eax;
187 case 1: return (BYTE *)&context->Ecx;
188 case 2: return (BYTE *)&context->Edx;
189 case 3: return (BYTE *)&context->Ebx;
190 case 4: return (BYTE *)&context->Esp;
191 case 5: return (BYTE *)&context->Ebp;
192 case 6: return (BYTE *)&context->Esi;
193 case 7: return (BYTE *)&context->Edi;
194 }
195 }
196
197 if (long_addr)
198 {
199 if (rm == 4)
200 {
201 BYTE sib;
202 GET_VAL( &sib, BYTE );
203 rm = sib & 7;
204 ss = sib >> 6;
205 switch((sib >> 3) & 7)
206 {
207 case 0: index = context->Eax; break;
208 case 1: index = context->Ecx; break;
209 case 2: index = context->Edx; break;
210 case 3: index = context->Ebx; break;
211 case 4: index = 0; break;
212 case 5: index = context->Ebp; break;
213 case 6: index = context->Esi; break;
214 case 7: index = context->Edi; break;
215 }
216 }
217
218 switch(rm)
219 {
220 case 0: base = context->Eax; seg = context->SegDs; break;
221 case 1: base = context->Ecx; seg = context->SegDs; break;
222 case 2: base = context->Edx; seg = context->SegDs; break;
223 case 3: base = context->Ebx; seg = context->SegDs; break;
224 case 4: base = context->Esp; seg = context->SegSs; break;
225 case 5: base = context->Ebp; seg = context->SegSs; break;
226 case 6: base = context->Esi; seg = context->SegDs; break;
227 case 7: base = context->Edi; seg = context->SegDs; break;
228 }
229 switch (mod)
230 {
231 case 0:
232 if (rm == 5) /* special case: ds:(disp32) */
233 {
234 GET_VAL( &base, DWORD );
235 seg = context->SegDs;
236 }
237 break;
238
239 case 1: /* 8-bit disp */
240 GET_VAL( &off, BYTE );
241 base += (signed char)off;
242 break;
243
244 case 2: /* 32-bit disp */
245 GET_VAL( &off, DWORD );
246 base += (signed long)off;
247 break;
248 }
249 }
250 else /* short address */
251 {
252 switch(rm)
253 {
254 case 0: /* ds:(bx,si) */
255 base = LOWORD(context->Ebx) + LOWORD(context->Esi);
256 seg = context->SegDs;
257 break;
258 case 1: /* ds:(bx,di) */
259 base = LOWORD(context->Ebx) + LOWORD(context->Edi);
260 seg = context->SegDs;
261 break;
262 case 2: /* ss:(bp,si) */
263 base = LOWORD(context->Ebp) + LOWORD(context->Esi);
264 seg = context->SegSs;
265 break;
266 case 3: /* ss:(bp,di) */
267 base = LOWORD(context->Ebp) + LOWORD(context->Edi);
268 seg = context->SegSs;
269 break;
270 case 4: /* ds:(si) */
271 base = LOWORD(context->Esi);
272 seg = context->SegDs;
273 break;
274 case 5: /* ds:(di) */
275 base = LOWORD(context->Edi);
276 seg = context->SegDs;
277 break;
278 case 6: /* ss:(bp) */
279 base = LOWORD(context->Ebp);
280 seg = context->SegSs;
281 break;
282 case 7: /* ds:(bx) */
283 base = LOWORD(context->Ebx);
284 seg = context->SegDs;
285 break;
286 }
287
288 switch(mod)
289 {
290 case 0:
291 if (rm == 6) /* special case: ds:(disp16) */
292 {
293 GET_VAL( &base, WORD );
294 seg = context->SegDs;
295 }
296 break;
297
298 case 1: /* 8-bit disp */
299 GET_VAL( &off, BYTE );
300 base += (signed char)off;
301 break;
302
303 case 2: /* 16-bit disp */
304 GET_VAL( &off, WORD );
305 base += (signed short)off;
306 break;
307 }
308 base &= 0xffff;
309 }
310 if (segprefix != -1) seg = segprefix;
311
312 /* Make sure the segment and offset are valid */
313 if (ldt_is_system(seg)) return (BYTE *)(base + (index << ss));
314 if ((seg & 7) != 7) return NULL;
315 if (!ldt_is_valid( seg )) return NULL;
316 if (ldt_get_limit( seg ) < (base + (index << ss))) return NULL;
317 return (BYTE *)ldt_get_base( seg ) + base + (index << ss);
318 #undef GET_VAL
319 }
320
321
322 /***********************************************************************
323 * INSTR_EmulateLDS
324 *
325 * Emulate the LDS (and LES,LFS,etc.) instruction.
326 */
327 static BOOL INSTR_EmulateLDS( CONTEXT *context, BYTE *instr, int long_op,
328 int long_addr, int segprefix, int *len )
329 {
330 WORD seg;
331 BYTE *regmodrm = instr + 1 + (*instr == 0x0f);
332 BYTE *addr = INSTR_GetOperandAddr( context, regmodrm,
333 long_addr, segprefix, len );
334 if (!addr)
335 return FALSE; /* Unable to emulate it */
336 seg = *(WORD *)(addr + (long_op ? 4 : 2));
337
338 if (!INSTR_ReplaceSelector( context, &seg ))
339 return FALSE; /* Unable to emulate it */
340
341 /* Now store the offset in the correct register */
342
343 store_reg_word( context, *regmodrm, addr, long_op );
344
345 /* Store the correct segment in the segment register */
346
347 switch(*instr)
348 {
349 case 0xc4: context->SegEs = seg; break; /* les */
350 case 0xc5: context->SegDs = seg; break; /* lds */
351 case 0x0f: switch(instr[1])
352 {
353 case 0xb2: context->SegSs = seg; break; /* lss */
354 case 0xb4: context->SegFs = seg; break; /* lfs */
355 case 0xb5: context->SegGs = seg; break; /* lgs */
356 }
357 break;
358 }
359
360 /* Add the opcode size to the total length */
361
362 *len += 1 + (*instr == 0x0f);
363 return TRUE;
364 }
365
366 /***********************************************************************
367 * INSTR_inport
368 *
369 * input on an I/O port
370 */
371 static DWORD INSTR_inport( WORD port, int size, CONTEXT *context )
372 {
373 DWORD res = DOSVM_inport( port, size );
374
375 if (TRACE_ON(io))
376 {
377 switch(size)
378 {
379 case 1:
380 TRACE_(io)( "0x%x < %02x @ %04x:%04x\n", port, LOBYTE(res),
381 (WORD)context->SegCs, LOWORD(context->Eip));
382 break;
383 case 2:
384 TRACE_(io)( "0x%x < %04x @ %04x:%04x\n", port, LOWORD(res),
385 (WORD)context->SegCs, LOWORD(context->Eip));
386 break;
387 case 4:
388 TRACE_(io)( "0x%x < %08lx @ %04x:%04x\n", port, res,
389 (WORD)context->SegCs, LOWORD(context->Eip));
390 break;
391 }
392 }
393 return res;
394 }
395
396
397 /***********************************************************************
398 * INSTR_outport
399 *
400 * output on an I/O port
401 */
402 static void INSTR_outport( WORD port, int size, DWORD val, CONTEXT *context )
403 {
404 DOSVM_outport( port, size, val );
405
406 if (TRACE_ON(io))
407 {
408 switch(size)
409 {
410 case 1:
411 TRACE_(io)("0x%x > %02x @ %04x:%04x\n", port, LOBYTE(val),
412 (WORD)context->SegCs, LOWORD(context->Eip));
413 break;
414 case 2:
415 TRACE_(io)("0x%x > %04x @ %04x:%04x\n", port, LOWORD(val),
416 (WORD)context->SegCs, LOWORD(context->Eip));
417 break;
418 case 4:
419 TRACE_(io)("0x%x > %08lx @ %04x:%04x\n", port, val,
420 (WORD)context->SegCs, LOWORD(context->Eip));
421 break;
422 }
423 }
424 }
425
426
427 /***********************************************************************
428 * __wine_emulate_instruction
429 *
430 * Emulate a privileged instruction.
431 * Returns exception continuation status.
432 */
433 DWORD __wine_emulate_instruction( EXCEPTION_RECORD *rec, CONTEXT *context )
434 {
435 int prefix, segprefix, prefixlen, len, repX, long_op, long_addr;
436 BYTE *instr;
437
438 long_op = long_addr = IS_SELECTOR_32BIT(context->SegCs);
439 instr = make_ptr( context, context->SegCs, context->Eip, TRUE );
440 if (!instr) return ExceptionContinueSearch;
441
442 /* First handle any possible prefix */
443
444 segprefix = -1; /* no prefix */
445 prefix = 1;
446 repX = 0;
447 prefixlen = 0;
448 while(prefix)
449 {
450 switch(*instr)
451 {
452 case 0x2e:
453 segprefix = context->SegCs;
454 break;
455 case 0x36:
456 segprefix = context->SegSs;
457 break;
458 case 0x3e:
459 segprefix = context->SegDs;
460 break;
461 case 0x26:
462 segprefix = context->SegEs;
463 break;
464 case 0x64:
465 segprefix = context->SegFs;
466 break;
467 case 0x65:
468 segprefix = context->SegGs;
469 break;
470 case 0x66:
471 long_op = !long_op; /* opcode size prefix */
472 break;
473 case 0x67:
474 long_addr = !long_addr; /* addr size prefix */
475 break;
476 case 0xf0: /* lock */
477 break;
478 case 0xf2: /* repne */
479 repX = 1;
480 break;
481 case 0xf3: /* repe */
482 repX = 2;
483 break;
484 default:
485 prefix = 0; /* no more prefixes */
486 break;
487 }
488 if (prefix)
489 {
490 instr++;
491 prefixlen++;
492 }
493 }
494
495 /* Now look at the actual instruction */
496
497 switch(*instr)
498 {
499 case 0x07: /* pop es */
500 case 0x17: /* pop ss */
501 case 0x1f: /* pop ds */
502 {
503 WORD seg = *(WORD *)get_stack( context );
504 if (INSTR_ReplaceSelector( context, &seg ))
505 {
506 switch(*instr)
507 {
508 case 0x07: context->SegEs = seg; break;
509 case 0x17: context->SegSs = seg; break;
510 case 0x1f: context->SegDs = seg; break;
511 }
512 add_stack(context, long_op ? 4 : 2);
513 context->Eip += prefixlen + 1;
514 return ExceptionContinueExecution;
515 }
516 }
517 break; /* Unable to emulate it */
518
519 case 0x0f: /* extended instruction */
520 switch(instr[1])
521 {
522 case 0x22: /* mov %eax, %crX */
523 switch (instr[2])
524 {
525 case 0xc0:
526 FIXME("mov %%eax, %%cr0 at 0x%08lx, EAX=0x%08lx\n",
527 context->Eip,context->Eax );
528 context->Eip += prefixlen+3;
529 return ExceptionContinueExecution;
530 default:
531 break; /* Fallthrough to bad instruction handling */
532 }
533 break; /* Fallthrough to bad instruction handling */
534 case 0x20: /* mov %crX, %eax */
535 switch (instr[2])
536 {
537 case 0xe0: /* mov %cr4, %eax */
538 /* CR4 register: See linux/arch/i386/mm/init.c, X86_CR4_ defs
539 * bit 0: VME Virtual Mode Exception ?
540 * bit 1: PVI Protected mode Virtual Interrupt
541 * bit 2: TSD Timestamp disable
542 * bit 3: DE Debugging extensions
543 * bit 4: PSE Page size extensions
544 * bit 5: PAE Physical address extension
545 * bit 6: MCE Machine check enable
546 * bit 7: PGE Enable global pages
547 * bit 8: PCE Enable performance counters at IPL3
548 */
549 FIXME("mov %%cr4, %%eax at 0x%08lx\n",context->Eip);
550 context->Eax = 0;
551 context->Eip += prefixlen+3;
552 return ExceptionContinueExecution;
553 case 0xc0: /* mov %cr0, %eax */
554 FIXME("mov %%cr0, %%eax at 0x%08lx\n",context->Eip);
555 context->Eax = 0x10; /* FIXME: set more bits ? */
556 context->Eip += prefixlen+3;
557 return ExceptionContinueExecution;
558 default: /* Fallthrough to illegal instruction */
559 break;
560 }
561 /* Fallthrough to illegal instruction */
562 break;
563 case 0x21: /* mov %drX, %eax */
564 switch (instr[2])
565 {
566 case 0xc8: /* mov %dr1, %eax */
567 TRACE("mov %%dr1, %%eax at 0x%08lx\n",context->Eip);
568 context->Eax = context->Dr1;
569 context->Eip += prefixlen+3;
570 return ExceptionContinueExecution;
571 case 0xf8: /* mov %dr7, %eax */
572 TRACE("mov %%dr7, %%eax at 0x%08lx\n",context->Eip);
573 context->Eax = 0x400;
574 context->Eip += prefixlen+3;
575 return ExceptionContinueExecution;
576 }
577 FIXME("Unsupported DR register, eip+2 is %02x\n", instr[2]);
578 /* fallthrough to illegal instruction */
579 break;
580 case 0x23: /* mov %eax, %drX */
581 switch (instr[2])
582 {
583 case 0xc8: /* mov %eax, %dr1 */
584 context->Dr1 = context->Eax;
585 context->Eip += prefixlen+3;
586 return ExceptionContinueExecution;
587 }
588 FIXME("Unsupported DR register, eip+2 is %02x\n", instr[2]);
589 /* fallthrough to illegal instruction */
590 break;
591 case 0xa1: /* pop fs */
592 {
593 WORD seg = *(WORD *)get_stack( context );
594 if (INSTR_ReplaceSelector( context, &seg ))
595 {
596 context->SegFs = seg;
597 add_stack(context, long_op ? 4 : 2);
598 context->Eip += prefixlen + 2;
599 return ExceptionContinueExecution;
600 }
601 }
602 break;
603 case 0xa9: /* pop gs */
604 {
605 WORD seg = *(WORD *)get_stack( context );
606 if (INSTR_ReplaceSelector( context, &seg ))
607 {
608 context->SegGs = seg;
609 add_stack(context, long_op ? 4 : 2);
610 context->Eip += prefixlen + 2;
611 return ExceptionContinueExecution;
612 }
613 }
614 break;
615 case 0xb2: /* lss addr,reg */
616 case 0xb4: /* lfs addr,reg */
617 case 0xb5: /* lgs addr,reg */
618 if (INSTR_EmulateLDS( context, instr, long_op,
619 long_addr, segprefix, &len ))
620 {
621 context->Eip += prefixlen + len;
622 return ExceptionContinueExecution;
623 }
624 break;
625 }
626 break; /* Unable to emulate it */
627
628 case 0x6c: /* insb */
629 case 0x6d: /* insw/d */
630 case 0x6e: /* outsb */
631 case 0x6f: /* outsw/d */
632 {
633 int typ = *instr; /* Just in case it's overwritten. */
634 int outp = (typ >= 0x6e);
635 unsigned long count = repX ?
636 (long_addr ? context->Ecx : LOWORD(context->Ecx)) : 1;
637 int opsize = (typ & 1) ? (long_op ? 4 : 2) : 1;
638 int step = (context->EFlags & 0x400) ? -opsize : +opsize;
639 int seg;
640
641 if (outp)
642 {
643 /* Check if there is a segment prefix override and honour it */
644 seg = segprefix == -1 ? context->SegDs : segprefix;
645 /* FIXME: Check segment is readable. */
646 }
647 else
648 {
649 seg = context->SegEs;
650 /* FIXME: Check segment is writable. */
651 }
652
653 if (repX)
654 {
655 if (long_addr) context->Ecx = 0;
656 else SET_LOWORD(context->Ecx,0);
657 }
658
659 while (count-- > 0)
660 {
661 void *data;
662 WORD dx = LOWORD(context->Edx);
663 if (outp)
664 {
665 data = make_ptr( context, seg, context->Esi, long_addr );
666 if (long_addr) context->Esi += step;
667 else ADD_LOWORD(context->Esi,step);
668 }
669 else
670 {
671 data = make_ptr( context, seg, context->Edi, long_addr );
672 if (long_addr) context->Edi += step;
673 else ADD_LOWORD(context->Edi,step);
674 }
675
676 switch (typ)
677 {
678 case 0x6c:
679 *(BYTE *)data = INSTR_inport( dx, 1, context );
680 break;
681 case 0x6d:
682 if (long_op)
683 *(DWORD *)data = INSTR_inport( dx, 4, context );
684 else
685 *(WORD *)data = INSTR_inport( dx, 2, context );
686 break;
687 case 0x6e:
688 INSTR_outport( dx, 1, *(BYTE *)data, context );
689 break;
690 case 0x6f:
691 if (long_op)
692 INSTR_outport( dx, 4, *(DWORD *)data, context );
693 else
694 INSTR_outport( dx, 2, *(WORD *)data, context );
695 break;
696 }
697 }
698 context->Eip += prefixlen + 1;
699 }
700 return ExceptionContinueExecution;
701
702 case 0x8a: /* mov Eb, Gb */
703 case 0x8b: /* mov Ev, Gv */
704 {
705 BYTE *data = INSTR_GetOperandAddr(context, instr + 1, long_addr,
706 segprefix, &len);
707 unsigned int data_size = (*instr == 0x8b) ? (long_op ? 4 : 2) : 1;
708 struct idtr idtr = get_idtr();
709 unsigned int offset = data - idtr.base;
710
711 if (offset <= idtr.limit + 1 - data_size)
712 {
713 idt[1].LimitLow = 0x100; /* FIXME */
714 idt[2].LimitLow = 0x11E; /* FIXME */
715 idt[3].LimitLow = 0x500; /* FIXME */
716
717 switch (*instr)
718 {
719 case 0x8a: store_reg_byte( context, instr[1], (BYTE *)idt + offset ); break;
720 case 0x8b: store_reg_word( context, instr[1], (BYTE *)idt + offset, long_op ); break;
721 }
722 context->Eip += prefixlen + len + 1;
723 return ExceptionContinueExecution;
724 }
725 }
726 break; /* Unable to emulate it */
727
728 case 0x8e: /* mov XX,segment_reg */
729 {
730 WORD seg;
731 BYTE *addr = INSTR_GetOperandAddr(context, instr + 1,
732 long_addr, segprefix, &len );
733 if (!addr)
734 break; /* Unable to emulate it */
735 seg = *(WORD *)addr;
736 if (!INSTR_ReplaceSelector( context, &seg ))
737 break; /* Unable to emulate it */
738
739 switch((instr[1] >> 3) & 7)
740 {
741 case 0:
742 context->SegEs = seg;
743 context->Eip += prefixlen + len + 1;
744 return ExceptionContinueExecution;
745 case 1: /* cs */
746 break;
747 case 2:
748 context->SegSs = seg;
749 context->Eip += prefixlen + len + 1;
750 return ExceptionContinueExecution;
751 case 3:
752 context->SegDs = seg;
753 context->Eip += prefixlen + len + 1;
754 return ExceptionContinueExecution;
755 case 4:
756 context->SegFs = seg;
757 context->Eip += prefixlen + len + 1;
758 return ExceptionContinueExecution;
759 case 5:
760 context->SegGs = seg;
761 context->Eip += prefixlen + len + 1;
762 return ExceptionContinueExecution;
763 case 6: /* unused */
764 case 7: /* unused */
765 break;
766 }
767 }
768 break; /* Unable to emulate it */
769
770 case 0xc4: /* les addr,reg */
771 case 0xc5: /* lds addr,reg */
772 if (INSTR_EmulateLDS( context, instr, long_op,
773 long_addr, segprefix, &len ))
774 {
775 context->Eip += prefixlen + len;
776 return ExceptionContinueExecution;
777 }
778 break; /* Unable to emulate it */
779
780 case 0xcd: /* int <XX> */
781 context->Eip += prefixlen + 2;
782 if (DOSVM_EmulateInterruptPM( context, instr[1] )) return ExceptionContinueExecution;
783 context->Eip -= prefixlen + 2; /* restore eip */
784 break; /* Unable to emulate it */
785
786 case 0xcf: /* iret */
787 if (ldt_is_system(context->SegCs)) break; /* don't emulate it in 32-bit code */
788 if (long_op)
789 {
790 DWORD *stack = get_stack( context );
791 context->Eip = *stack++;
792 context->SegCs = *stack++;
793 context->EFlags = *stack;
794 add_stack(context, 3*sizeof(DWORD)); /* Pop the return address and flags */
795 }
796 else
797 {
798 WORD *stack = get_stack( context );
799 context->Eip = *stack++;
800 context->SegCs = *stack++;
801 SET_LOWORD(context->EFlags,*stack);
802 add_stack(context, 3*sizeof(WORD)); /* Pop the return address and flags */
803 }
804 return ExceptionContinueExecution;
805
806 case 0xe4: /* inb al,XX */
807 SET_LOBYTE(context->Eax,INSTR_inport( instr[1], 1, context ));
808 context->Eip += prefixlen + 2;
809 return ExceptionContinueExecution;
810
811 case 0xe5: /* in (e)ax,XX */
812 if (long_op)
813 context->Eax = INSTR_inport( instr[1], 4, context );
814 else
815 SET_LOWORD(context->Eax, INSTR_inport( instr[1], 2, context ));
816 context->Eip += prefixlen + 2;
817 return ExceptionContinueExecution;
818
819 case 0xe6: /* outb XX,al */
820 INSTR_outport( instr[1], 1, LOBYTE(context->Eax), context );
821 context->Eip += prefixlen + 2;
822 return ExceptionContinueExecution;
823
824 case 0xe7: /* out XX,(e)ax */
825 if (long_op)
826 INSTR_outport( instr[1], 4, context->Eax, context );
827 else
828 INSTR_outport( instr[1], 2, LOWORD(context->Eax), context );
829 context->Eip += prefixlen + 2;
830 return ExceptionContinueExecution;
831
832 case 0xec: /* inb al,dx */
833 SET_LOBYTE(context->Eax, INSTR_inport( LOWORD(context->Edx), 1, context ) );
834 context->Eip += prefixlen + 1;
835 return ExceptionContinueExecution;
836
837 case 0xed: /* in (e)ax,dx */
838 if (long_op)
839 context->Eax = INSTR_inport( LOWORD(context->Edx), 4, context );
840 else
841 SET_LOWORD(context->Eax, INSTR_inport( LOWORD(context->Edx), 2, context ));
842 context->Eip += prefixlen + 1;
843 return ExceptionContinueExecution;
844
845 case 0xee: /* outb dx,al */
846 INSTR_outport( LOWORD(context->Edx), 1, LOBYTE(context->Eax), context );
847 context->Eip += prefixlen + 1;
848 return ExceptionContinueExecution;
849
850 case 0xef: /* out dx,(e)ax */
851 if (long_op)
852 INSTR_outport( LOWORD(context->Edx), 4, context->Eax, context );
853 else
854 INSTR_outport( LOWORD(context->Edx), 2, LOWORD(context->Eax), context );
855 context->Eip += prefixlen + 1;
856 return ExceptionContinueExecution;
857
858 case 0xfa: /* cli */
859 context->Eip += prefixlen + 1;
860 return ExceptionContinueExecution;
861
862 case 0xfb: /* sti */
863 context->Eip += prefixlen + 1;
864 return ExceptionContinueExecution;
865 }
866 return ExceptionContinueSearch; /* Unable to emulate it */
867 }
868
869
870 /***********************************************************************
871 * INSTR_vectored_handler
872 *
873 * Vectored exception handler used to emulate protected instructions
874 * from 32-bit code.
875 */
876 LONG CALLBACK INSTR_vectored_handler( EXCEPTION_POINTERS *ptrs )
877 {
878 EXCEPTION_RECORD *record = ptrs->ExceptionRecord;
879 CONTEXT *context = ptrs->ContextRecord;
880
881 if (ldt_is_system(context->SegCs) &&
882 (record->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
883 record->ExceptionCode == EXCEPTION_PRIV_INSTRUCTION))
884 {
885 if (__wine_emulate_instruction( record, context ) == ExceptionContinueExecution)
886 return EXCEPTION_CONTINUE_EXECUTION;
887 }
888 return EXCEPTION_CONTINUE_SEARCH;
889 }
890
891
892 /***********************************************************************
893 * DOS3Call (KERNEL.102)
894 */
895 void WINAPI DOS3Call( CONTEXT *context )
896 {
897 __wine_call_int_handler16( 0x21, context );
898 }
899
900
901 /***********************************************************************
902 * NetBIOSCall (KERNEL.103)
903 */
904 void WINAPI NetBIOSCall16( CONTEXT *context )
905 {
906 __wine_call_int_handler16( 0x5c, context );
907 }
908
909
910 /***********************************************************************
911 * GetSetKernelDOSProc (KERNEL.311)
912 */
913 FARPROC16 WINAPI GetSetKernelDOSProc16( FARPROC16 DosProc )
914 {
915 FIXME("(DosProc=%p): stub\n", DosProc);
916 return NULL;
917 }
Windows API implementation