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
23 #include "wine/winuser16.h"
26 #include "selectors.h"
27 #include "wine/debug.h"
30 WINE_DEFAULT_DEBUG_CHANNEL(int);
31 WINE_DECLARE_DEBUG_CHANNEL(io
);
35 /* macros to set parts of a DWORD */
36 #define SET_LOWORD(dw,val) ((dw) = ((dw) & 0xffff0000) | LOWORD(val))
37 #define SET_LOBYTE(dw,val) ((dw) = ((dw) & 0xffffff00) | LOBYTE(val))
38 #define ADD_LOWORD(dw,val) ((dw) = ((dw) & 0xffff0000) | LOWORD((DWORD)(dw)+(val)))
40 inline static void add_stack( CONTEXT86
*context
, int offset
)
42 if (ISV86(context
) || !IS_SELECTOR_32BIT(context
->SegSs
))
43 ADD_LOWORD( context
->Esp
, offset
);
45 context
->Esp
+= offset
;
48 inline static void *make_ptr( CONTEXT86
*context
, DWORD seg
, DWORD off
, int long_addr
)
50 if (ISV86(context
)) return PTR_REAL_TO_LIN( seg
, off
);
51 if (IS_SELECTOR_SYSTEM(seg
)) return (void *)off
;
52 if (!long_addr
) off
= LOWORD(off
);
53 return (char *) MapSL( MAKESEGPTR( seg
, 0 ) ) + off
;
56 inline static void *get_stack( CONTEXT86
*context
)
59 return PTR_REAL_TO_LIN( context
->SegSs
, context
->Esp
);
60 if (IS_SELECTOR_SYSTEM(context
->SegSs
))
61 return (void *)context
->Esp
;
62 if (IS_SELECTOR_32BIT(context
->SegSs
))
63 return (char *) MapSL( MAKESEGPTR( context
->SegSs
, 0 ) ) + context
->Esp
;
64 return MapSL( MAKESEGPTR( context
->SegSs
, LOWORD(context
->Esp
) ) );
67 /***********************************************************************
68 * INSTR_ReplaceSelector
70 * Try to replace an invalid selector by a valid one.
71 * The only selector where it is allowed to do "mov ax,40;mov es,ax"
72 * is the so called 'bimodal' selector 0x40, which points to the BIOS
73 * data segment. Used by (at least) Borland products (and programs compiled
74 * using Borland products).
76 * See Undocumented Windows, Chapter 5, __0040.
78 static BOOL
INSTR_ReplaceSelector( CONTEXT86
*context
, WORD
*sel
)
80 extern char Call16_Start
, Call16_End
;
82 if (IS_SELECTOR_SYSTEM(context
->SegCs
))
83 if ( (char *)context
->Eip
>= &Call16_Start
84 && (char *)context
->Eip
< &Call16_End
)
86 /* Saved selector may have become invalid when the relay code */
87 /* tries to restore it. We simply clear it. */
94 static WORD sys_timer
= 0;
96 sys_timer
= CreateSystemTimer( 55, DOSMEM_Tick
);
97 *sel
= DOSMEM_BiosDataSeg
;
100 if (!IS_SELECTOR_SYSTEM(*sel
) && !IS_SELECTOR_FREE(*sel
))
101 ERR("Got protection fault on valid selector, maybe your kernel is too old?\n" );
102 return FALSE
; /* Can't replace selector, crashdump */
106 /***********************************************************************
107 * INSTR_GetOperandAddr
109 * Return the address of an instruction operand (from the mod/rm byte).
111 static BYTE
*INSTR_GetOperandAddr( CONTEXT86
*context
, BYTE
*instr
,
112 int long_addr
, int segprefix
, int *len
)
114 int mod
, rm
, base
, index
= 0, ss
= 0, seg
= 0, off
;
116 #define GET_VAL(val,type) \
117 { *val = *(type *)instr; instr += sizeof(type); *len += sizeof(type); }
120 GET_VAL( &mod
, BYTE
);
128 case 0: return (BYTE
*)&context
->Eax
;
129 case 1: return (BYTE
*)&context
->Ecx
;
130 case 2: return (BYTE
*)&context
->Edx
;
131 case 3: return (BYTE
*)&context
->Ebx
;
132 case 4: return (BYTE
*)&context
->Esp
;
133 case 5: return (BYTE
*)&context
->Ebp
;
134 case 6: return (BYTE
*)&context
->Esi
;
135 case 7: return (BYTE
*)&context
->Edi
;
144 GET_VAL( &sib
, BYTE
);
149 case 0: index
= context
->Eax
; break;
150 case 1: index
= context
->Ecx
; break;
151 case 2: index
= context
->Edx
; break;
152 case 3: index
= context
->Ebx
; break;
153 case 4: index
= 0; break;
154 case 5: index
= context
->Ebp
; break;
155 case 6: index
= context
->Esi
; break;
156 case 7: index
= context
->Edi
; break;
162 case 0: base
= context
->Eax
; seg
= context
->SegDs
; break;
163 case 1: base
= context
->Ecx
; seg
= context
->SegDs
; break;
164 case 2: base
= context
->Edx
; seg
= context
->SegDs
; break;
165 case 3: base
= context
->Ebx
; seg
= context
->SegDs
; break;
166 case 4: base
= context
->Esp
; seg
= context
->SegSs
; break;
167 case 5: base
= context
->Ebp
; seg
= context
->SegSs
; break;
168 case 6: base
= context
->Esi
; seg
= context
->SegDs
; break;
169 case 7: base
= context
->Edi
; seg
= context
->SegDs
; break;
174 if (rm
== 5) /* special case: ds:(disp32) */
176 GET_VAL( &base
, DWORD
);
177 seg
= context
->SegDs
;
181 case 1: /* 8-bit disp */
182 GET_VAL( &off
, BYTE
);
183 base
+= (signed char)off
;
186 case 2: /* 32-bit disp */
187 GET_VAL( &off
, DWORD
);
188 base
+= (signed long)off
;
192 else /* short address */
196 case 0: /* ds:(bx,si) */
197 base
= LOWORD(context
->Ebx
) + LOWORD(context
->Esi
);
198 seg
= context
->SegDs
;
200 case 1: /* ds:(bx,di) */
201 base
= LOWORD(context
->Ebx
) + LOWORD(context
->Edi
);
202 seg
= context
->SegDs
;
204 case 2: /* ss:(bp,si) */
205 base
= LOWORD(context
->Ebp
) + LOWORD(context
->Esi
);
206 seg
= context
->SegSs
;
208 case 3: /* ss:(bp,di) */
209 base
= LOWORD(context
->Ebp
) + LOWORD(context
->Edi
);
210 seg
= context
->SegSs
;
212 case 4: /* ds:(si) */
213 base
= LOWORD(context
->Esi
);
214 seg
= context
->SegDs
;
216 case 5: /* ds:(di) */
217 base
= LOWORD(context
->Edi
);
218 seg
= context
->SegDs
;
220 case 6: /* ss:(bp) */
221 base
= LOWORD(context
->Ebp
);
222 seg
= context
->SegSs
;
224 case 7: /* ds:(bx) */
225 base
= LOWORD(context
->Ebx
);
226 seg
= context
->SegDs
;
233 if (rm
== 6) /* special case: ds:(disp16) */
235 GET_VAL( &base
, WORD
);
236 seg
= context
->SegDs
;
240 case 1: /* 8-bit disp */
241 GET_VAL( &off
, BYTE
);
242 base
+= (signed char)off
;
245 case 2: /* 16-bit disp */
246 GET_VAL( &off
, WORD
);
247 base
+= (signed short)off
;
252 if (segprefix
!= -1) seg
= segprefix
;
254 /* Make sure the segment and offset are valid */
255 if (IS_SELECTOR_SYSTEM(seg
)) return (BYTE
*)(base
+ (index
<< ss
));
256 if (((seg
& 7) != 7) || IS_SELECTOR_FREE(seg
)) return NULL
;
257 if (wine_ldt_copy
.limit
[seg
>> 3] < (base
+ (index
<< ss
))) return NULL
;
258 return (char *) MapSL( MAKESEGPTR( seg
, 0 ) ) + base
+ (index
<< ss
);
263 /***********************************************************************
266 * Emulate the LDS (and LES,LFS,etc.) instruction.
268 static BOOL
INSTR_EmulateLDS( CONTEXT86
*context
, BYTE
*instr
, int long_op
,
269 int long_addr
, int segprefix
, int *len
)
272 BYTE
*regmodrm
= instr
+ 1 + (*instr
== 0x0f);
273 BYTE
*addr
= INSTR_GetOperandAddr( context
, regmodrm
,
274 long_addr
, segprefix
, len
);
276 return FALSE
; /* Unable to emulate it */
277 seg
= *(WORD
*)(addr
+ (long_op
? 4 : 2));
279 if (!INSTR_ReplaceSelector( context
, &seg
))
280 return FALSE
; /* Unable to emulate it */
282 /* Now store the offset in the correct register */
284 switch((*regmodrm
>> 3) & 7)
287 if (long_op
) context
->Eax
= *(DWORD
*)addr
;
288 else SET_LOWORD(context
->Eax
,*(WORD
*)addr
);
291 if (long_op
) context
->Ecx
= *(DWORD
*)addr
;
292 else SET_LOWORD(context
->Ecx
,*(WORD
*)addr
);
295 if (long_op
) context
->Edx
= *(DWORD
*)addr
;
296 else SET_LOWORD(context
->Edx
,*(WORD
*)addr
);
299 if (long_op
) context
->Ebx
= *(DWORD
*)addr
;
300 else SET_LOWORD(context
->Ebx
,*(WORD
*)addr
);
303 if (long_op
) context
->Esp
= *(DWORD
*)addr
;
304 else SET_LOWORD(context
->Esp
,*(WORD
*)addr
);
307 if (long_op
) context
->Ebp
= *(DWORD
*)addr
;
308 else SET_LOWORD(context
->Ebp
,*(WORD
*)addr
);
311 if (long_op
) context
->Esi
= *(DWORD
*)addr
;
312 else SET_LOWORD(context
->Esi
,*(WORD
*)addr
);
315 if (long_op
) context
->Edi
= *(DWORD
*)addr
;
316 else SET_LOWORD(context
->Edi
,*(WORD
*)addr
);
320 /* Store the correct segment in the segment register */
324 case 0xc4: context
->SegEs
= seg
; break; /* les */
325 case 0xc5: context
->SegDs
= seg
; break; /* lds */
326 case 0x0f: switch(instr
[1])
328 case 0xb2: context
->SegSs
= seg
; break; /* lss */
329 case 0xb4: context
->SegFs
= seg
; break; /* lfs */
330 case 0xb5: context
->SegGs
= seg
; break; /* lgs */
335 /* Add the opcode size to the total length */
337 *len
+= 1 + (*instr
== 0x0f);
341 /***********************************************************************
344 * input on a I/O port
346 static DWORD
INSTR_inport( WORD port
, int size
, CONTEXT86
*context
)
348 DWORD res
= IO_inport( port
, size
);
354 DPRINTF( "0x%x < %02x @ %04x:%04x\n", port
, LOBYTE(res
),
355 (WORD
)context
->SegCs
, LOWORD(context
->Eip
));
358 DPRINTF( "0x%x < %04x @ %04x:%04x\n", port
, LOWORD(res
),
359 (WORD
)context
->SegCs
, LOWORD(context
->Eip
));
362 DPRINTF( "0x%x < %08lx @ %04x:%04x\n", port
, res
,
363 (WORD
)context
->SegCs
, LOWORD(context
->Eip
));
371 /***********************************************************************
374 * output on a I/O port
376 static void INSTR_outport( WORD port
, int size
, DWORD val
, CONTEXT86
*context
)
378 IO_outport( port
, size
, val
);
384 DPRINTF("0x%x > %02x @ %04x:%04x\n", port
, LOBYTE(val
),
385 (WORD
)context
->SegCs
, LOWORD(context
->Eip
));
388 DPRINTF("0x%x > %04x @ %04x:%04x\n", port
, LOWORD(val
),
389 (WORD
)context
->SegCs
, LOWORD(context
->Eip
));
392 DPRINTF("0x%x > %08lx @ %04x:%04x\n", port
, val
,
393 (WORD
)context
->SegCs
, LOWORD(context
->Eip
));
400 /***********************************************************************
401 * INSTR_EmulateInstruction
403 * Emulate a privileged instruction. Returns TRUE if emulation successful.
405 BOOL
INSTR_EmulateInstruction( CONTEXT86
*context
)
407 int prefix
, segprefix
, prefixlen
, len
, repX
, long_op
, long_addr
;
411 long_op
= long_addr
= (!ISV86(context
) && IS_SELECTOR_32BIT(context
->SegCs
));
412 instr
= make_ptr( context
, context
->SegCs
, context
->Eip
, TRUE
);
413 if (!instr
) return FALSE
;
415 /* First handle any possible prefix */
417 segprefix
= -1; /* no prefix */
426 segprefix
= context
->SegCs
;
429 segprefix
= context
->SegSs
;
432 segprefix
= context
->SegDs
;
435 segprefix
= context
->SegEs
;
438 segprefix
= context
->SegFs
;
441 segprefix
= context
->SegGs
;
444 long_op
= !long_op
; /* opcode size prefix */
447 long_addr
= !long_addr
; /* addr size prefix */
449 case 0xf0: /* lock */
451 case 0xf2: /* repne */
454 case 0xf3: /* repe */
458 prefix
= 0; /* no more prefixes */
468 /* Now look at the actual instruction */
472 case 0x07: /* pop es */
473 case 0x17: /* pop ss */
474 case 0x1f: /* pop ds */
476 WORD seg
= *(WORD
*)get_stack( context
);
477 if (INSTR_ReplaceSelector( context
, &seg
))
481 case 0x07: context
->SegEs
= seg
; break;
482 case 0x17: context
->SegSs
= seg
; break;
483 case 0x1f: context
->SegDs
= seg
; break;
485 add_stack(context
, long_op
? 4 : 2);
486 context
->Eip
+= prefixlen
+ 1;
490 break; /* Unable to emulate it */
492 case 0x0f: /* extended instruction */
495 case 0x22: /* mov eax, crX */
498 ERR("mov eax,cr0 at 0x%08lx, EAX=0x%08lx\n",
499 context
->Eip
,context
->Eax
);
500 context
->Eip
+= prefixlen
+3;
503 break; /*fallthrough to bad instruction handling */
505 break; /*fallthrough to bad instruction handling */
506 case 0x20: /* mov crX, eax */
508 case 0xe0: /* mov cr4, eax */
509 /* CR4 register . See linux/arch/i386/mm/init.c, X86_CR4_ defs
510 * bit 0: VME Virtual Mode Exception ?
511 * bit 1: PVI Protected mode Virtual Interrupt
512 * bit 2: TSD Timestamp disable
513 * bit 3: DE Debugging extensions
514 * bit 4: PSE Page size extensions
515 * bit 5: PAE Physical address extension
516 * bit 6: MCE Machine check enable
517 * bit 7: PGE Enable global pages
518 * bit 8: PCE Enable performance counters at IPL3
520 ERR("mov cr4,eax at 0x%08lx\n",context
->Eip
);
522 context
->Eip
+= prefixlen
+3;
524 case 0xc0: /* mov cr0, eax */
525 ERR("mov cr0,eax at 0x%08lx\n",context
->Eip
);
526 context
->Eax
= 0x10; /* FIXME: set more bits ? */
527 context
->Eip
+= prefixlen
+3;
529 default: /* fallthrough to illegal instruction */
532 /* fallthrough to illegal instruction */
534 case 0xa1: /* pop fs */
536 WORD seg
= *(WORD
*)get_stack( context
);
537 if (INSTR_ReplaceSelector( context
, &seg
))
539 context
->SegFs
= seg
;
540 add_stack(context
, long_op
? 4 : 2);
541 context
->Eip
+= prefixlen
+ 2;
546 case 0xa9: /* pop gs */
548 WORD seg
= *(WORD
*)get_stack( context
);
549 if (INSTR_ReplaceSelector( context
, &seg
))
551 context
->SegGs
= seg
;
552 add_stack(context
, long_op
? 4 : 2);
553 context
->Eip
+= prefixlen
+ 2;
558 case 0xb2: /* lss addr,reg */
559 case 0xb4: /* lfs addr,reg */
560 case 0xb5: /* lgs addr,reg */
561 if (INSTR_EmulateLDS( context
, instr
, long_op
,
562 long_addr
, segprefix
, &len
))
564 context
->Eip
+= prefixlen
+ len
;
569 break; /* Unable to emulate it */
571 case 0x6c: /* insb */
572 case 0x6d: /* insw/d */
573 case 0x6e: /* outsb */
574 case 0x6f: /* outsw/d */
576 int typ
= *instr
; /* Just in case it's overwritten. */
577 int outp
= (typ
>= 0x6e);
578 unsigned long count
= repX
?
579 (long_addr
? context
->Ecx
: LOWORD(context
->Ecx
)) : 1;
580 int opsize
= (typ
& 1) ? (long_op
? 4 : 2) : 1;
581 int step
= (context
->EFlags
& 0x400) ? -opsize
: +opsize
;
582 int seg
= outp
? context
->SegDs
: context
->SegEs
; /* FIXME: is this right? */
585 /* FIXME: Check segment readable. */
588 /* FIXME: Check segment writeable. */
593 if (long_addr
) context
->Ecx
= 0;
594 else SET_LOWORD(context
->Ecx
,0);
600 WORD dx
= LOWORD(context
->Edx
);
603 data
= make_ptr( context
, seg
, context
->Esi
, long_addr
);
604 if (long_addr
) context
->Esi
+= step
;
605 else ADD_LOWORD(context
->Esi
,step
);
609 data
= make_ptr( context
, seg
, context
->Edi
, long_addr
);
610 if (long_addr
) context
->Edi
+= step
;
611 else ADD_LOWORD(context
->Edi
,step
);
617 *(BYTE
*)data
= INSTR_inport( dx
, 1, context
);
621 *(DWORD
*)data
= INSTR_inport( dx
, 4, context
);
623 *(WORD
*)data
= INSTR_inport( dx
, 2, context
);
626 INSTR_outport( dx
, 1, *(BYTE
*)data
, context
);
630 INSTR_outport( dx
, 4, *(DWORD
*)data
, context
);
632 INSTR_outport( dx
, 2, *(WORD
*)data
, context
);
636 context
->Eip
+= prefixlen
+ 1;
640 case 0x8e: /* mov XX,segment_reg */
643 BYTE
*addr
= INSTR_GetOperandAddr(context
, instr
+ 1,
644 long_addr
, segprefix
, &len
);
646 break; /* Unable to emulate it */
648 if (!INSTR_ReplaceSelector( context
, &seg
))
649 break; /* Unable to emulate it */
651 switch((instr
[1] >> 3) & 7)
654 context
->SegEs
= seg
;
655 context
->Eip
+= prefixlen
+ len
+ 1;
660 context
->SegSs
= seg
;
661 context
->Eip
+= prefixlen
+ len
+ 1;
664 context
->SegDs
= seg
;
665 context
->Eip
+= prefixlen
+ len
+ 1;
668 context
->SegFs
= seg
;
669 context
->Eip
+= prefixlen
+ len
+ 1;
672 context
->SegGs
= seg
;
673 context
->Eip
+= prefixlen
+ len
+ 1;
680 break; /* Unable to emulate it */
682 case 0xc4: /* les addr,reg */
683 case 0xc5: /* lds addr,reg */
684 if (INSTR_EmulateLDS( context
, instr
, long_op
,
685 long_addr
, segprefix
, &len
))
687 context
->Eip
+= prefixlen
+ len
;
690 break; /* Unable to emulate it */
692 case 0xcd: /* int <XX> */
693 if(!Dosvm
.EmulateInterruptPM
&& !DPMI_LoadDosSystem())
694 ERR("could not initialize interrupt handling\n");
696 context
->Eip
+= prefixlen
+ 2;
697 Dosvm
.EmulateInterruptPM( context
, instr
[1] );
700 break; /* Unable to emulate it */
702 case 0xcf: /* iret */
705 DWORD
*stack
= get_stack( context
);
706 context
->Eip
= *stack
++;
707 context
->SegCs
= *stack
++;
708 context
->EFlags
= *stack
;
709 add_stack(context
, 3*sizeof(DWORD
)); /* Pop the return address and flags */
713 WORD
*stack
= get_stack( context
);
714 context
->Eip
= *stack
++;
715 context
->SegCs
= *stack
++;
716 SET_LOWORD(context
->EFlags
,*stack
);
717 add_stack(context
, 3*sizeof(WORD
)); /* Pop the return address and flags */
721 case 0xe4: /* inb al,XX */
722 SET_LOBYTE(context
->Eax
,INSTR_inport( instr
[1], 1, context
));
723 context
->Eip
+= prefixlen
+ 2;
726 case 0xe5: /* in (e)ax,XX */
728 context
->Eax
= INSTR_inport( instr
[1], 4, context
);
730 SET_LOWORD(context
->Eax
, INSTR_inport( instr
[1], 2, context
));
731 context
->Eip
+= prefixlen
+ 2;
734 case 0xe6: /* outb XX,al */
735 INSTR_outport( instr
[1], 1, LOBYTE(context
->Eax
), context
);
736 context
->Eip
+= prefixlen
+ 2;
739 case 0xe7: /* out XX,(e)ax */
741 INSTR_outport( instr
[1], 4, context
->Eax
, context
);
743 INSTR_outport( instr
[1], 2, LOWORD(context
->Eax
), context
);
744 context
->Eip
+= prefixlen
+ 2;
747 case 0xec: /* inb al,dx */
748 SET_LOBYTE(context
->Eax
, INSTR_inport( LOWORD(context
->Edx
), 1, context
) );
749 context
->Eip
+= prefixlen
+ 1;
752 case 0xed: /* in (e)ax,dx */
754 context
->Eax
= INSTR_inport( LOWORD(context
->Edx
), 4, context
);
756 SET_LOWORD(context
->Eax
, INSTR_inport( LOWORD(context
->Edx
), 2, context
));
757 context
->Eip
+= prefixlen
+ 1;
760 case 0xee: /* outb dx,al */
761 INSTR_outport( LOWORD(context
->Edx
), 1, LOBYTE(context
->Eax
), context
);
762 context
->Eip
+= prefixlen
+ 1;
765 case 0xef: /* out dx,(e)ax */
767 INSTR_outport( LOWORD(context
->Edx
), 4, context
->Eax
, context
);
769 INSTR_outport( LOWORD(context
->Edx
), 2, LOWORD(context
->Eax
), context
);
770 context
->Eip
+= prefixlen
+ 1;
773 case 0xfa: /* cli, ignored */
774 context
->Eip
+= prefixlen
+ 1;
777 case 0xfb: /* sti, ignored */
778 context
->Eip
+= prefixlen
+ 1;
783 /* Check for Win16 __GP handler */
784 gpHandler
= HasGPHandler16( MAKESEGPTR( context
->SegCs
, context
->Eip
) );
787 WORD
*stack
= get_stack( context
);
788 *--stack
= context
->SegCs
;
789 *--stack
= context
->Eip
;
790 add_stack(context
, -2*sizeof(WORD
));
792 context
->SegCs
= SELECTOROF( gpHandler
);
793 context
->Eip
= OFFSETOF( gpHandler
);
796 return FALSE
; /* Unable to emulate it */
799 #endif /* __i386__ */