2 * Emulation of privileged instructions
4 * Copyright 1995 Alexandre Julliard
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.
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.
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
22 #include "wine/port.h"
30 #include "wine/winuser16.h"
34 #include "wine/debug.h"
35 #include "kernel_private.h"
37 #include "wine/exception.h"
39 WINE_DEFAULT_DEBUG_CHANNEL(int);
40 WINE_DECLARE_DEBUG_CHANNEL(io
);
42 /* macros to set parts of a DWORD */
43 #define SET_LOWORD(dw,val) ((dw) = ((dw) & 0xffff0000) | LOWORD(val))
44 #define SET_LOBYTE(dw,val) ((dw) = ((dw) & 0xffffff00) | LOBYTE(val))
45 #define ADD_LOWORD(dw,val) ((dw) = ((dw) & 0xffff0000) | LOWORD((DWORD)(dw)+(val)))
46 #define ISV86(context) ((context)->EFlags & 0x00020000)
48 inline static void add_stack( CONTEXT86
*context
, int offset
)
50 if (ISV86(context
) || !IS_SELECTOR_32BIT(context
->SegSs
))
51 ADD_LOWORD( context
->Esp
, offset
);
53 context
->Esp
+= offset
;
56 inline static void *make_ptr( CONTEXT86
*context
, DWORD seg
, DWORD off
, int long_addr
)
58 if (ISV86(context
)) return (void *)((seg
<< 4) + LOWORD(off
));
59 if (wine_ldt_is_system(seg
)) return (void *)off
;
60 if (!long_addr
) off
= LOWORD(off
);
61 return (char *) MapSL( MAKESEGPTR( seg
, 0 ) ) + off
;
64 inline static void *get_stack( CONTEXT86
*context
)
66 if (ISV86(context
)) return (void *)((context
->SegSs
<< 4) + LOWORD(context
->Esp
));
67 return wine_ldt_get_ptr( context
->SegSs
, context
->Esp
);
71 static void (WINAPI
*DOS_EmulateInterruptPM
)( CONTEXT86
*context
, BYTE intnum
);
72 static void (WINAPI
*DOS_CallBuiltinHandler
)( CONTEXT86
*context
, BYTE intnum
);
73 static DWORD (WINAPI
*DOS_inport
)( int port
, int size
);
74 static void (WINAPI
*DOS_outport
)( int port
, int size
, DWORD val
);
77 static void init_winedos(void)
79 static HMODULE module
;
82 module
= LoadLibraryA( "winedos.dll" );
85 ERR("could not load winedos.dll, DOS subsystem unavailable\n");
86 module
= (HMODULE
)1; /* don't try again */
89 #define GET_ADDR(func) DOS_##func = (void *)GetProcAddress(module, #func);
92 GET_ADDR(EmulateInterruptPM
);
93 GET_ADDR(CallBuiltinHandler
);
98 /***********************************************************************
99 * INSTR_ReplaceSelector
101 * Try to replace an invalid selector by a valid one.
102 * The only selector where it is allowed to do "mov ax,40;mov es,ax"
103 * is the so called 'bimodal' selector 0x40, which points to the BIOS
104 * data segment. Used by (at least) Borland products (and programs compiled
105 * using Borland products).
107 * See Undocumented Windows, Chapter 5, __0040.
109 static BOOL
INSTR_ReplaceSelector( CONTEXT86
*context
, WORD
*sel
)
113 static WORD sys_timer
= 0;
115 sys_timer
= CreateSystemTimer( 55, DOSMEM_Tick
);
116 *sel
= DOSMEM_BiosDataSeg
;
119 return FALSE
; /* Can't replace selector, crashdump */
123 /***********************************************************************
124 * INSTR_GetOperandAddr
126 * Return the address of an instruction operand (from the mod/rm byte).
128 static BYTE
*INSTR_GetOperandAddr( CONTEXT86
*context
, BYTE
*instr
,
129 int long_addr
, int segprefix
, int *len
)
131 int mod
, rm
, base
, index
= 0, ss
= 0, seg
= 0, off
;
134 #define GET_VAL(val,type) \
135 { *val = *(type *)instr; instr += sizeof(type); *len += sizeof(type); }
138 GET_VAL( &mod
, BYTE
);
146 case 0: return (BYTE
*)&context
->Eax
;
147 case 1: return (BYTE
*)&context
->Ecx
;
148 case 2: return (BYTE
*)&context
->Edx
;
149 case 3: return (BYTE
*)&context
->Ebx
;
150 case 4: return (BYTE
*)&context
->Esp
;
151 case 5: return (BYTE
*)&context
->Ebp
;
152 case 6: return (BYTE
*)&context
->Esi
;
153 case 7: return (BYTE
*)&context
->Edi
;
162 GET_VAL( &sib
, BYTE
);
167 case 0: index
= context
->Eax
; break;
168 case 1: index
= context
->Ecx
; break;
169 case 2: index
= context
->Edx
; break;
170 case 3: index
= context
->Ebx
; break;
171 case 4: index
= 0; break;
172 case 5: index
= context
->Ebp
; break;
173 case 6: index
= context
->Esi
; break;
174 case 7: index
= context
->Edi
; break;
180 case 0: base
= context
->Eax
; seg
= context
->SegDs
; break;
181 case 1: base
= context
->Ecx
; seg
= context
->SegDs
; break;
182 case 2: base
= context
->Edx
; seg
= context
->SegDs
; break;
183 case 3: base
= context
->Ebx
; seg
= context
->SegDs
; break;
184 case 4: base
= context
->Esp
; seg
= context
->SegSs
; break;
185 case 5: base
= context
->Ebp
; seg
= context
->SegSs
; break;
186 case 6: base
= context
->Esi
; seg
= context
->SegDs
; break;
187 case 7: base
= context
->Edi
; seg
= context
->SegDs
; break;
192 if (rm
== 5) /* special case: ds:(disp32) */
194 GET_VAL( &base
, DWORD
);
195 seg
= context
->SegDs
;
199 case 1: /* 8-bit disp */
200 GET_VAL( &off
, BYTE
);
201 base
+= (signed char)off
;
204 case 2: /* 32-bit disp */
205 GET_VAL( &off
, DWORD
);
206 base
+= (signed long)off
;
210 else /* short address */
214 case 0: /* ds:(bx,si) */
215 base
= LOWORD(context
->Ebx
) + LOWORD(context
->Esi
);
216 seg
= context
->SegDs
;
218 case 1: /* ds:(bx,di) */
219 base
= LOWORD(context
->Ebx
) + LOWORD(context
->Edi
);
220 seg
= context
->SegDs
;
222 case 2: /* ss:(bp,si) */
223 base
= LOWORD(context
->Ebp
) + LOWORD(context
->Esi
);
224 seg
= context
->SegSs
;
226 case 3: /* ss:(bp,di) */
227 base
= LOWORD(context
->Ebp
) + LOWORD(context
->Edi
);
228 seg
= context
->SegSs
;
230 case 4: /* ds:(si) */
231 base
= LOWORD(context
->Esi
);
232 seg
= context
->SegDs
;
234 case 5: /* ds:(di) */
235 base
= LOWORD(context
->Edi
);
236 seg
= context
->SegDs
;
238 case 6: /* ss:(bp) */
239 base
= LOWORD(context
->Ebp
);
240 seg
= context
->SegSs
;
242 case 7: /* ds:(bx) */
243 base
= LOWORD(context
->Ebx
);
244 seg
= context
->SegDs
;
251 if (rm
== 6) /* special case: ds:(disp16) */
253 GET_VAL( &base
, WORD
);
254 seg
= context
->SegDs
;
258 case 1: /* 8-bit disp */
259 GET_VAL( &off
, BYTE
);
260 base
+= (signed char)off
;
263 case 2: /* 16-bit disp */
264 GET_VAL( &off
, WORD
);
265 base
+= (signed short)off
;
270 if (segprefix
!= -1) seg
= segprefix
;
272 /* Make sure the segment and offset are valid */
273 if (wine_ldt_is_system(seg
)) return (BYTE
*)(base
+ (index
<< ss
));
274 if ((seg
& 7) != 7) return NULL
;
275 wine_ldt_get_entry( seg
, &entry
);
276 if (wine_ldt_is_empty( &entry
)) return NULL
;
277 if (wine_ldt_get_limit(&entry
) < (base
+ (index
<< ss
))) return NULL
;
278 return (char *)wine_ldt_get_base(&entry
) + base
+ (index
<< ss
);
283 /***********************************************************************
286 * Emulate the LDS (and LES,LFS,etc.) instruction.
288 static BOOL
INSTR_EmulateLDS( CONTEXT86
*context
, BYTE
*instr
, int long_op
,
289 int long_addr
, int segprefix
, int *len
)
292 BYTE
*regmodrm
= instr
+ 1 + (*instr
== 0x0f);
293 BYTE
*addr
= INSTR_GetOperandAddr( context
, regmodrm
,
294 long_addr
, segprefix
, len
);
296 return FALSE
; /* Unable to emulate it */
297 seg
= *(WORD
*)(addr
+ (long_op
? 4 : 2));
299 if (!INSTR_ReplaceSelector( context
, &seg
))
300 return FALSE
; /* Unable to emulate it */
302 /* Now store the offset in the correct register */
304 switch((*regmodrm
>> 3) & 7)
307 if (long_op
) context
->Eax
= *(DWORD
*)addr
;
308 else SET_LOWORD(context
->Eax
,*(WORD
*)addr
);
311 if (long_op
) context
->Ecx
= *(DWORD
*)addr
;
312 else SET_LOWORD(context
->Ecx
,*(WORD
*)addr
);
315 if (long_op
) context
->Edx
= *(DWORD
*)addr
;
316 else SET_LOWORD(context
->Edx
,*(WORD
*)addr
);
319 if (long_op
) context
->Ebx
= *(DWORD
*)addr
;
320 else SET_LOWORD(context
->Ebx
,*(WORD
*)addr
);
323 if (long_op
) context
->Esp
= *(DWORD
*)addr
;
324 else SET_LOWORD(context
->Esp
,*(WORD
*)addr
);
327 if (long_op
) context
->Ebp
= *(DWORD
*)addr
;
328 else SET_LOWORD(context
->Ebp
,*(WORD
*)addr
);
331 if (long_op
) context
->Esi
= *(DWORD
*)addr
;
332 else SET_LOWORD(context
->Esi
,*(WORD
*)addr
);
335 if (long_op
) context
->Edi
= *(DWORD
*)addr
;
336 else SET_LOWORD(context
->Edi
,*(WORD
*)addr
);
340 /* Store the correct segment in the segment register */
344 case 0xc4: context
->SegEs
= seg
; break; /* les */
345 case 0xc5: context
->SegDs
= seg
; break; /* lds */
346 case 0x0f: switch(instr
[1])
348 case 0xb2: context
->SegSs
= seg
; break; /* lss */
349 case 0xb4: context
->SegFs
= seg
; break; /* lfs */
350 case 0xb5: context
->SegGs
= seg
; break; /* lgs */
355 /* Add the opcode size to the total length */
357 *len
+= 1 + (*instr
== 0x0f);
361 /***********************************************************************
364 * input on a I/O port
366 static DWORD
INSTR_inport( WORD port
, int size
, CONTEXT86
*context
)
370 if (!DOS_inport
) init_winedos();
371 if (DOS_inport
) res
= DOS_inport( port
, size
);
378 DPRINTF( "0x%x < %02x @ %04x:%04x\n", port
, LOBYTE(res
),
379 (WORD
)context
->SegCs
, LOWORD(context
->Eip
));
382 DPRINTF( "0x%x < %04x @ %04x:%04x\n", port
, LOWORD(res
),
383 (WORD
)context
->SegCs
, LOWORD(context
->Eip
));
386 DPRINTF( "0x%x < %08lx @ %04x:%04x\n", port
, res
,
387 (WORD
)context
->SegCs
, LOWORD(context
->Eip
));
395 /***********************************************************************
398 * output on a I/O port
400 static void INSTR_outport( WORD port
, int size
, DWORD val
, CONTEXT86
*context
)
402 if (!DOS_outport
) init_winedos();
403 if (DOS_outport
) DOS_outport( port
, size
, val
);
410 DPRINTF("0x%x > %02x @ %04x:%04x\n", port
, LOBYTE(val
),
411 (WORD
)context
->SegCs
, LOWORD(context
->Eip
));
414 DPRINTF("0x%x > %04x @ %04x:%04x\n", port
, LOWORD(val
),
415 (WORD
)context
->SegCs
, LOWORD(context
->Eip
));
418 DPRINTF("0x%x > %08lx @ %04x:%04x\n", port
, val
,
419 (WORD
)context
->SegCs
, LOWORD(context
->Eip
));
426 /***********************************************************************
427 * INSTR_EmulateInstruction
429 * Emulate a privileged instruction.
430 * Returns exception continuation status.
432 DWORD
INSTR_EmulateInstruction( EXCEPTION_RECORD
*rec
, CONTEXT86
*context
)
434 int prefix
, segprefix
, prefixlen
, len
, repX
, long_op
, long_addr
;
437 long_op
= long_addr
= (!ISV86(context
) && IS_SELECTOR_32BIT(context
->SegCs
));
438 instr
= make_ptr( context
, context
->SegCs
, context
->Eip
, TRUE
);
439 if (!instr
) return ExceptionContinueSearch
;
441 /* First handle any possible prefix */
443 segprefix
= -1; /* no prefix */
452 segprefix
= context
->SegCs
;
455 segprefix
= context
->SegSs
;
458 segprefix
= context
->SegDs
;
461 segprefix
= context
->SegEs
;
464 segprefix
= context
->SegFs
;
467 segprefix
= context
->SegGs
;
470 long_op
= !long_op
; /* opcode size prefix */
473 long_addr
= !long_addr
; /* addr size prefix */
475 case 0xf0: /* lock */
477 case 0xf2: /* repne */
480 case 0xf3: /* repe */
484 prefix
= 0; /* no more prefixes */
494 /* Now look at the actual instruction */
498 case 0x07: /* pop es */
499 case 0x17: /* pop ss */
500 case 0x1f: /* pop ds */
502 WORD seg
= *(WORD
*)get_stack( context
);
503 if (INSTR_ReplaceSelector( context
, &seg
))
507 case 0x07: context
->SegEs
= seg
; break;
508 case 0x17: context
->SegSs
= seg
; break;
509 case 0x1f: context
->SegDs
= seg
; break;
511 add_stack(context
, long_op
? 4 : 2);
512 context
->Eip
+= prefixlen
+ 1;
513 return ExceptionContinueExecution
;
516 break; /* Unable to emulate it */
518 case 0x0f: /* extended instruction */
521 case 0x22: /* mov eax, crX */
525 ERR("mov eax,cr0 at 0x%08lx, EAX=0x%08lx\n",
526 context
->Eip
,context
->Eax
);
527 context
->Eip
+= prefixlen
+3;
528 return ExceptionContinueExecution
;
530 break; /*fallthrough to bad instruction handling */
532 break; /*fallthrough to bad instruction handling */
533 case 0x20: /* mov crX, eax */
536 case 0xe0: /* mov cr4, eax */
537 /* CR4 register . See linux/arch/i386/mm/init.c, X86_CR4_ defs
538 * bit 0: VME Virtual Mode Exception ?
539 * bit 1: PVI Protected mode Virtual Interrupt
540 * bit 2: TSD Timestamp disable
541 * bit 3: DE Debugging extensions
542 * bit 4: PSE Page size extensions
543 * bit 5: PAE Physical address extension
544 * bit 6: MCE Machine check enable
545 * bit 7: PGE Enable global pages
546 * bit 8: PCE Enable performance counters at IPL3
548 ERR("mov cr4,eax at 0x%08lx\n",context
->Eip
);
550 context
->Eip
+= prefixlen
+3;
551 return ExceptionContinueExecution
;
552 case 0xc0: /* mov cr0, eax */
553 ERR("mov cr0,eax at 0x%08lx\n",context
->Eip
);
554 context
->Eax
= 0x10; /* FIXME: set more bits ? */
555 context
->Eip
+= prefixlen
+3;
556 return ExceptionContinueExecution
;
557 default: /* fallthrough to illegal instruction */
560 /* fallthrough to illegal instruction */
562 case 0x21: /* mov drX, eax */
565 case 0xf8: /* mov dr7, eax */
566 TRACE("mov dr7,eax at 0x%08lx\n",context
->Eip
);
567 context
->Eax
= 0x400;
568 context
->Eip
+= prefixlen
+3;
569 return ExceptionContinueExecution
;
570 default: /* fallthrough to illegal instruction */
571 ERR("Unknown DR register, eip+2 is %02x\n", instr
[2]);
574 /* fallthrough to illegal instruction */
576 case 0xa1: /* pop fs */
578 WORD seg
= *(WORD
*)get_stack( context
);
579 if (INSTR_ReplaceSelector( context
, &seg
))
581 context
->SegFs
= seg
;
582 add_stack(context
, long_op
? 4 : 2);
583 context
->Eip
+= prefixlen
+ 2;
584 return ExceptionContinueExecution
;
588 case 0xa9: /* pop gs */
590 WORD seg
= *(WORD
*)get_stack( context
);
591 if (INSTR_ReplaceSelector( context
, &seg
))
593 context
->SegGs
= seg
;
594 add_stack(context
, long_op
? 4 : 2);
595 context
->Eip
+= prefixlen
+ 2;
596 return ExceptionContinueExecution
;
600 case 0xb2: /* lss addr,reg */
601 case 0xb4: /* lfs addr,reg */
602 case 0xb5: /* lgs addr,reg */
603 if (INSTR_EmulateLDS( context
, instr
, long_op
,
604 long_addr
, segprefix
, &len
))
606 context
->Eip
+= prefixlen
+ len
;
607 return ExceptionContinueExecution
;
611 break; /* Unable to emulate it */
613 case 0x6c: /* insb */
614 case 0x6d: /* insw/d */
615 case 0x6e: /* outsb */
616 case 0x6f: /* outsw/d */
618 int typ
= *instr
; /* Just in case it's overwritten. */
619 int outp
= (typ
>= 0x6e);
620 unsigned long count
= repX
?
621 (long_addr
? context
->Ecx
: LOWORD(context
->Ecx
)) : 1;
622 int opsize
= (typ
& 1) ? (long_op
? 4 : 2) : 1;
623 int step
= (context
->EFlags
& 0x400) ? -opsize
: +opsize
;
624 int seg
= outp
? context
->SegDs
: context
->SegEs
; /* FIXME: is this right? */
627 /* FIXME: Check segment readable. */
630 /* FIXME: Check segment writeable. */
635 if (long_addr
) context
->Ecx
= 0;
636 else SET_LOWORD(context
->Ecx
,0);
642 WORD dx
= LOWORD(context
->Edx
);
645 data
= make_ptr( context
, seg
, context
->Esi
, long_addr
);
646 if (long_addr
) context
->Esi
+= step
;
647 else ADD_LOWORD(context
->Esi
,step
);
651 data
= make_ptr( context
, seg
, context
->Edi
, long_addr
);
652 if (long_addr
) context
->Edi
+= step
;
653 else ADD_LOWORD(context
->Edi
,step
);
659 *(BYTE
*)data
= INSTR_inport( dx
, 1, context
);
663 *(DWORD
*)data
= INSTR_inport( dx
, 4, context
);
665 *(WORD
*)data
= INSTR_inport( dx
, 2, context
);
668 INSTR_outport( dx
, 1, *(BYTE
*)data
, context
);
672 INSTR_outport( dx
, 4, *(DWORD
*)data
, context
);
674 INSTR_outport( dx
, 2, *(WORD
*)data
, context
);
678 context
->Eip
+= prefixlen
+ 1;
680 return ExceptionContinueExecution
;
682 case 0x8e: /* mov XX,segment_reg */
685 BYTE
*addr
= INSTR_GetOperandAddr(context
, instr
+ 1,
686 long_addr
, segprefix
, &len
);
688 break; /* Unable to emulate it */
690 if (!INSTR_ReplaceSelector( context
, &seg
))
691 break; /* Unable to emulate it */
693 switch((instr
[1] >> 3) & 7)
696 context
->SegEs
= seg
;
697 context
->Eip
+= prefixlen
+ len
+ 1;
698 return ExceptionContinueExecution
;
702 context
->SegSs
= seg
;
703 context
->Eip
+= prefixlen
+ len
+ 1;
704 return ExceptionContinueExecution
;
706 context
->SegDs
= seg
;
707 context
->Eip
+= prefixlen
+ len
+ 1;
708 return ExceptionContinueExecution
;
710 context
->SegFs
= seg
;
711 context
->Eip
+= prefixlen
+ len
+ 1;
712 return ExceptionContinueExecution
;
714 context
->SegGs
= seg
;
715 context
->Eip
+= prefixlen
+ len
+ 1;
716 return ExceptionContinueExecution
;
722 break; /* Unable to emulate it */
724 case 0xc4: /* les addr,reg */
725 case 0xc5: /* lds addr,reg */
726 if (INSTR_EmulateLDS( context
, instr
, long_op
,
727 long_addr
, segprefix
, &len
))
729 context
->Eip
+= prefixlen
+ len
;
730 return ExceptionContinueExecution
;
732 break; /* Unable to emulate it */
734 case 0xcd: /* int <XX> */
735 if (wine_ldt_is_system(context
->SegCs
)) break; /* don't emulate it in 32-bit code */
736 if (!DOS_EmulateInterruptPM
) init_winedos();
737 if (DOS_EmulateInterruptPM
)
739 context
->Eip
+= prefixlen
+ 2;
740 DOS_EmulateInterruptPM( context
, instr
[1] );
741 return ExceptionContinueExecution
;
743 break; /* Unable to emulate it */
745 case 0xcf: /* iret */
746 if (wine_ldt_is_system(context
->SegCs
)) break; /* don't emulate it in 32-bit code */
749 DWORD
*stack
= get_stack( context
);
750 context
->Eip
= *stack
++;
751 context
->SegCs
= *stack
++;
752 context
->EFlags
= *stack
;
753 add_stack(context
, 3*sizeof(DWORD
)); /* Pop the return address and flags */
757 WORD
*stack
= get_stack( context
);
758 context
->Eip
= *stack
++;
759 context
->SegCs
= *stack
++;
760 SET_LOWORD(context
->EFlags
,*stack
);
761 add_stack(context
, 3*sizeof(WORD
)); /* Pop the return address and flags */
763 return ExceptionContinueExecution
;
765 case 0xe4: /* inb al,XX */
766 SET_LOBYTE(context
->Eax
,INSTR_inport( instr
[1], 1, context
));
767 context
->Eip
+= prefixlen
+ 2;
768 return ExceptionContinueExecution
;
770 case 0xe5: /* in (e)ax,XX */
772 context
->Eax
= INSTR_inport( instr
[1], 4, context
);
774 SET_LOWORD(context
->Eax
, INSTR_inport( instr
[1], 2, context
));
775 context
->Eip
+= prefixlen
+ 2;
776 return ExceptionContinueExecution
;
778 case 0xe6: /* outb XX,al */
779 INSTR_outport( instr
[1], 1, LOBYTE(context
->Eax
), context
);
780 context
->Eip
+= prefixlen
+ 2;
781 return ExceptionContinueExecution
;
783 case 0xe7: /* out XX,(e)ax */
785 INSTR_outport( instr
[1], 4, context
->Eax
, context
);
787 INSTR_outport( instr
[1], 2, LOWORD(context
->Eax
), context
);
788 context
->Eip
+= prefixlen
+ 2;
789 return ExceptionContinueExecution
;
791 case 0xec: /* inb al,dx */
792 SET_LOBYTE(context
->Eax
, INSTR_inport( LOWORD(context
->Edx
), 1, context
) );
793 context
->Eip
+= prefixlen
+ 1;
794 return ExceptionContinueExecution
;
796 case 0xed: /* in (e)ax,dx */
798 context
->Eax
= INSTR_inport( LOWORD(context
->Edx
), 4, context
);
800 SET_LOWORD(context
->Eax
, INSTR_inport( LOWORD(context
->Edx
), 2, context
));
801 context
->Eip
+= prefixlen
+ 1;
802 return ExceptionContinueExecution
;
804 case 0xee: /* outb dx,al */
805 INSTR_outport( LOWORD(context
->Edx
), 1, LOBYTE(context
->Eax
), context
);
806 context
->Eip
+= prefixlen
+ 1;
807 return ExceptionContinueExecution
;
809 case 0xef: /* out dx,(e)ax */
811 INSTR_outport( LOWORD(context
->Edx
), 4, context
->Eax
, context
);
813 INSTR_outport( LOWORD(context
->Edx
), 2, LOWORD(context
->Eax
), context
);
814 context
->Eip
+= prefixlen
+ 1;
815 return ExceptionContinueExecution
;
818 NtCurrentTeb()->dpmi_vif
= 0;
819 context
->Eip
+= prefixlen
+ 1;
820 return ExceptionContinueExecution
;
823 NtCurrentTeb()->dpmi_vif
= 1;
824 context
->Eip
+= prefixlen
+ 1;
825 return ExceptionContinueExecution
;
827 return ExceptionContinueSearch
; /* Unable to emulate it */
831 /***********************************************************************
832 * INSTR_CallBuiltinHandler
834 void INSTR_CallBuiltinHandler( CONTEXT86
*context
, BYTE intnum
)
836 if (!DOS_CallBuiltinHandler
) init_winedos();
837 if (DOS_CallBuiltinHandler
) DOS_CallBuiltinHandler( context
, intnum
);
841 /***********************************************************************
842 * DOS3Call (KERNEL.102)
844 void WINAPI
DOS3Call( CONTEXT86
*context
)
846 INSTR_CallBuiltinHandler( context
, 0x21 );
850 /***********************************************************************
851 * NetBIOSCall (KERNEL.103)
853 void WINAPI
NetBIOSCall16( CONTEXT86
*context
)
855 INSTR_CallBuiltinHandler( context
, 0x5c );
859 /***********************************************************************
860 * GetSetKernelDOSProc (KERNEL.311)
862 FARPROC16 WINAPI
GetSetKernelDOSProc16( FARPROC16 DosProc
)
864 FIXME("(DosProc=0x%08x): stub\n", (UINT
)DosProc
);