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wine/dlls/kernel32/instr.c

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/*
* Emulation of privileged instructions
*
* Copyright 1995 Alexandre Julliard
* Copyright 2005 Ivan Leo Puoti
* Copyright 2005 Laurent Pinchart
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "config.h"
#include "wine/port.h"
#include <stdarg.h>
#include "windef.h"
#include "winbase.h"
#include "wine/winuser16.h"
#include "excpt.h"
#include "thread.h"
#include "wine/debug.h"
#include "kernel_private.h"
#include "kernel16_private.h"
#include "wine/exception.h"
WINE_DEFAULT_DEBUG_CHANNEL(int);
WINE_DECLARE_DEBUG_CHANNEL(io);
/* macros to set parts of a DWORD */
#define SET_LOWORD(dw,val) ((dw) = ((dw) & 0xffff0000) | LOWORD(val))
#define SET_LOBYTE(dw,val) ((dw) = ((dw) & 0xffffff00) | LOBYTE(val))
#define ADD_LOWORD(dw,val) ((dw) = ((dw) & 0xffff0000) | LOWORD((DWORD)(dw)+(val)))
#define ISV86(context) ((context)->EFlags & 0x00020000)
static inline void add_stack( CONTEXT86 *context, int offset )
{
if (ISV86(context) || !IS_SELECTOR_32BIT(context->SegSs))
ADD_LOWORD( context->Esp, offset );
else
context->Esp += offset;
}
static inline void *make_ptr( CONTEXT86 *context, DWORD seg, DWORD off, int long_addr )
{
if (ISV86(context)) return (void *)((seg << 4) + LOWORD(off));
if (wine_ldt_is_system(seg)) return (void *)off;
if (!long_addr) off = LOWORD(off);
return (char *) MapSL( MAKESEGPTR( seg, 0 ) ) + off;
}
static inline void *get_stack( CONTEXT86 *context )
{
if (ISV86(context)) return (void *)((context->SegSs << 4) + LOWORD(context->Esp));
return wine_ldt_get_ptr( context->SegSs, context->Esp );
}
#include "pshpack1.h"
struct idtr
{
WORD limit;
BYTE *base;
};
#include "poppack.h"
static LDT_ENTRY idt[256];
static inline struct idtr get_idtr(void)
{
struct idtr ret;
#if defined(__i386__) && defined(__GNUC__)
__asm__( "sidtl %0" : "=m" (ret) );
#else
ret.base = (BYTE *)idt;
ret.limit = sizeof(idt) - 1;
#endif
return ret;
}
/***********************************************************************
* INSTR_ReplaceSelector
*
* Try to replace an invalid selector by a valid one.
* The only selector where it is allowed to do "mov ax,40;mov es,ax"
* is the so called 'bimodal' selector 0x40, which points to the BIOS
* data segment. Used by (at least) Borland products (and programs compiled
* using Borland products).
*
* See Undocumented Windows, Chapter 5, __0040.
*/
static BOOL INSTR_ReplaceSelector( CONTEXT86 *context, WORD *sel )
{
if (*sel == 0x40)
{
static WORD sys_timer = 0;
if (!sys_timer)
{
if (!winedos.BiosTick) load_winedos();
if (winedos.BiosTick)
sys_timer = CreateSystemTimer( 55, winedos.BiosTick );
}
*sel = DOSMEM_BiosDataSeg;
return TRUE;
}
return FALSE; /* Can't replace selector, crashdump */
}
/* store an operand into a register */
static void store_reg( CONTEXT86 *context, BYTE regmodrm, const BYTE *addr, int long_op )
{
switch((regmodrm >> 3) & 7)
{
case 0:
if (long_op) context->Eax = *(const DWORD *)addr;
else SET_LOWORD(context->Eax, *(const WORD *)addr);
break;
case 1:
if (long_op) context->Ecx = *(const DWORD *)addr;
else SET_LOWORD(context->Ecx, *(const WORD *)addr);
break;
case 2:
if (long_op) context->Edx = *(const DWORD *)addr;
else SET_LOWORD(context->Edx, *(const WORD *)addr);
break;
case 3:
if (long_op) context->Ebx = *(const DWORD *)addr;
else SET_LOWORD(context->Ebx, *(const WORD *)addr);
break;
case 4:
if (long_op) context->Esp = *(const DWORD *)addr;
else SET_LOWORD(context->Esp, *(const WORD *)addr);
break;
case 5:
if (long_op) context->Ebp = *(const DWORD *)addr;
else SET_LOWORD(context->Ebp, *(const WORD *)addr);
break;
case 6:
if (long_op) context->Esi = *(const DWORD *)addr;
else SET_LOWORD(context->Esi, *(const WORD *)addr);
break;
case 7:
if (long_op) context->Edi = *(const DWORD *)addr;
else SET_LOWORD(context->Edi, *(const WORD *)addr);
break;
}
}
/***********************************************************************
* INSTR_GetOperandAddr
*
* Return the address of an instruction operand (from the mod/rm byte).
*/
static BYTE *INSTR_GetOperandAddr( CONTEXT86 *context, BYTE *instr,
int long_addr, int segprefix, int *len )
{
int mod, rm, base = 0, index = 0, ss = 0, seg = 0, off;
LDT_ENTRY entry;
#define GET_VAL(val,type) \
{ *val = *(type *)instr; instr += sizeof(type); *len += sizeof(type); }
*len = 0;
GET_VAL( &mod, BYTE );
rm = mod & 7;
mod >>= 6;
if (mod == 3)
{
switch(rm)
{
case 0: return (BYTE *)&context->Eax;
case 1: return (BYTE *)&context->Ecx;
case 2: return (BYTE *)&context->Edx;
case 3: return (BYTE *)&context->Ebx;
case 4: return (BYTE *)&context->Esp;
case 5: return (BYTE *)&context->Ebp;
case 6: return (BYTE *)&context->Esi;
case 7: return (BYTE *)&context->Edi;
}
}
if (long_addr)
{
if (rm == 4)
{
BYTE sib;
GET_VAL( &sib, BYTE );
rm = sib & 7;
ss = sib >> 6;
switch(sib >> 3)
{
case 0: index = context->Eax; break;
case 1: index = context->Ecx; break;
case 2: index = context->Edx; break;
case 3: index = context->Ebx; break;
case 4: index = 0; break;
case 5: index = context->Ebp; break;
case 6: index = context->Esi; break;
case 7: index = context->Edi; break;
}
}
switch(rm)
{
case 0: base = context->Eax; seg = context->SegDs; break;
case 1: base = context->Ecx; seg = context->SegDs; break;
case 2: base = context->Edx; seg = context->SegDs; break;
case 3: base = context->Ebx; seg = context->SegDs; break;
case 4: base = context->Esp; seg = context->SegSs; break;
case 5: base = context->Ebp; seg = context->SegSs; break;
case 6: base = context->Esi; seg = context->SegDs; break;
case 7: base = context->Edi; seg = context->SegDs; break;
}
switch (mod)
{
case 0:
if (rm == 5) /* special case: ds:(disp32) */
{
GET_VAL( &base, DWORD );
seg = context->SegDs;
}
break;
case 1: /* 8-bit disp */
GET_VAL( &off, BYTE );
base += (signed char)off;
break;
case 2: /* 32-bit disp */
GET_VAL( &off, DWORD );
base += (signed long)off;
break;
}
}
else /* short address */
{
switch(rm)
{
case 0: /* ds:(bx,si) */
base = LOWORD(context->Ebx) + LOWORD(context->Esi);
seg = context->SegDs;
break;
case 1: /* ds:(bx,di) */
base = LOWORD(context->Ebx) + LOWORD(context->Edi);
seg = context->SegDs;
break;
case 2: /* ss:(bp,si) */
base = LOWORD(context->Ebp) + LOWORD(context->Esi);
seg = context->SegSs;
break;
case 3: /* ss:(bp,di) */
base = LOWORD(context->Ebp) + LOWORD(context->Edi);
seg = context->SegSs;
break;
case 4: /* ds:(si) */
base = LOWORD(context->Esi);
seg = context->SegDs;
break;
case 5: /* ds:(di) */
base = LOWORD(context->Edi);
seg = context->SegDs;
break;
case 6: /* ss:(bp) */
base = LOWORD(context->Ebp);
seg = context->SegSs;
break;
case 7: /* ds:(bx) */
base = LOWORD(context->Ebx);
seg = context->SegDs;
break;
}
switch(mod)
{
case 0:
if (rm == 6) /* special case: ds:(disp16) */
{
GET_VAL( &base, WORD );
seg = context->SegDs;
}
break;
case 1: /* 8-bit disp */
GET_VAL( &off, BYTE );
base += (signed char)off;
break;
case 2: /* 16-bit disp */
GET_VAL( &off, WORD );
base += (signed short)off;
break;
}
base &= 0xffff;
}
if (segprefix != -1) seg = segprefix;
/* Make sure the segment and offset are valid */
if (wine_ldt_is_system(seg)) return (BYTE *)(base + (index << ss));
if ((seg & 7) != 7) return NULL;
wine_ldt_get_entry( seg, &entry );
if (wine_ldt_is_empty( &entry )) return NULL;
if (wine_ldt_get_limit(&entry) < (base + (index << ss))) return NULL;
return (BYTE *)wine_ldt_get_base(&entry) + base + (index << ss);
#undef GET_VAL
}
/***********************************************************************
* INSTR_EmulateLDS
*
* Emulate the LDS (and LES,LFS,etc.) instruction.
*/
static BOOL INSTR_EmulateLDS( CONTEXT86 *context, BYTE *instr, int long_op,
int long_addr, int segprefix, int *len )
{
WORD seg;
BYTE *regmodrm = instr + 1 + (*instr == 0x0f);
BYTE *addr = INSTR_GetOperandAddr( context, regmodrm,
long_addr, segprefix, len );
if (!addr)
return FALSE; /* Unable to emulate it */
seg = *(WORD *)(addr + (long_op ? 4 : 2));
if (!INSTR_ReplaceSelector( context, &seg ))
return FALSE; /* Unable to emulate it */
/* Now store the offset in the correct register */
store_reg( context, *regmodrm, addr, long_op );
/* Store the correct segment in the segment register */
switch(*instr)
{
case 0xc4: context->SegEs = seg; break; /* les */
case 0xc5: context->SegDs = seg; break; /* lds */
case 0x0f: switch(instr[1])
{
case 0xb2: context->SegSs = seg; break; /* lss */
case 0xb4: context->SegFs = seg; break; /* lfs */
case 0xb5: context->SegGs = seg; break; /* lgs */
}
break;
}
/* Add the opcode size to the total length */
*len += 1 + (*instr == 0x0f);
return TRUE;
}
/***********************************************************************
* INSTR_inport
*
* input on an I/O port
*/
static DWORD INSTR_inport( WORD port, int size, CONTEXT86 *context )
{
DWORD res = ~0U;
if (!winedos.inport) load_winedos();
if (winedos.inport) res = winedos.inport( port, size );
if (TRACE_ON(io))
{
switch(size)
{
case 1:
TRACE_(io)( "0x%x < %02x @ %04x:%04x\n", port, LOBYTE(res),
(WORD)context->SegCs, LOWORD(context->Eip));
break;
case 2:
TRACE_(io)( "0x%x < %04x @ %04x:%04x\n", port, LOWORD(res),
(WORD)context->SegCs, LOWORD(context->Eip));
break;
case 4:
TRACE_(io)( "0x%x < %08x @ %04x:%04x\n", port, res,
(WORD)context->SegCs, LOWORD(context->Eip));
break;
}
}
return res;
}
/***********************************************************************
* INSTR_outport
*
* output on an I/O port
*/
static void INSTR_outport( WORD port, int size, DWORD val, CONTEXT86 *context )
{
if (!winedos.outport) load_winedos();
if (winedos.outport) winedos.outport( port, size, val );
if (TRACE_ON(io))
{
switch(size)
{
case 1:
TRACE_(io)("0x%x > %02x @ %04x:%04x\n", port, LOBYTE(val),
(WORD)context->SegCs, LOWORD(context->Eip));
break;
case 2:
TRACE_(io)("0x%x > %04x @ %04x:%04x\n", port, LOWORD(val),
(WORD)context->SegCs, LOWORD(context->Eip));
break;
case 4:
TRACE_(io)("0x%x > %08x @ %04x:%04x\n", port, val,
(WORD)context->SegCs, LOWORD(context->Eip));
break;
}
}
}
/***********************************************************************
* __wine_emulate_instruction
*
* Emulate a privileged instruction.
* Returns exception continuation status.
*/
DWORD __wine_emulate_instruction( EXCEPTION_RECORD *rec, CONTEXT86 *context )
{
int prefix, segprefix, prefixlen, len, repX, long_op, long_addr;
BYTE *instr;
long_op = long_addr = (!ISV86(context) && IS_SELECTOR_32BIT(context->SegCs));
instr = make_ptr( context, context->SegCs, context->Eip, TRUE );
if (!instr) return ExceptionContinueSearch;
/* First handle any possible prefix */
segprefix = -1; /* no prefix */
prefix = 1;
repX = 0;
prefixlen = 0;
while(prefix)
{
switch(*instr)
{
case 0x2e:
segprefix = context->SegCs;
break;
case 0x36:
segprefix = context->SegSs;
break;
case 0x3e:
segprefix = context->SegDs;
break;
case 0x26:
segprefix = context->SegEs;
break;
case 0x64:
segprefix = context->SegFs;
break;
case 0x65:
segprefix = context->SegGs;
break;
case 0x66:
long_op = !long_op; /* opcode size prefix */
break;
case 0x67:
long_addr = !long_addr; /* addr size prefix */
break;
case 0xf0: /* lock */
break;
case 0xf2: /* repne */
repX = 1;
break;
case 0xf3: /* repe */
repX = 2;
break;
default:
prefix = 0; /* no more prefixes */
break;
}
if (prefix)
{
instr++;
prefixlen++;
}
}
/* Now look at the actual instruction */
switch(*instr)
{
case 0x07: /* pop es */
case 0x17: /* pop ss */
case 0x1f: /* pop ds */
{
WORD seg = *(WORD *)get_stack( context );
if (INSTR_ReplaceSelector( context, &seg ))
{
switch(*instr)
{
case 0x07: context->SegEs = seg; break;
case 0x17: context->SegSs = seg; break;
case 0x1f: context->SegDs = seg; break;
}
add_stack(context, long_op ? 4 : 2);
context->Eip += prefixlen + 1;
return ExceptionContinueExecution;
}
}
break; /* Unable to emulate it */
case 0x0f: /* extended instruction */
switch(instr[1])
{
case 0x22: /* mov eax, crX */
switch (instr[2])
{
case 0xc0:
ERR("mov eax,cr0 at 0x%08x, EAX=0x%08x\n",
context->Eip,context->Eax );
context->Eip += prefixlen+3;
return ExceptionContinueExecution;
default:
break; /*fallthrough to bad instruction handling */
}
break; /*fallthrough to bad instruction handling */
case 0x20: /* mov crX, eax */
switch (instr[2])
{
case 0xe0: /* mov cr4, eax */
/* CR4 register . See linux/arch/i386/mm/init.c, X86_CR4_ defs
* bit 0: VME Virtual Mode Exception ?
* bit 1: PVI Protected mode Virtual Interrupt
* bit 2: TSD Timestamp disable
* bit 3: DE Debugging extensions
* bit 4: PSE Page size extensions
* bit 5: PAE Physical address extension
* bit 6: MCE Machine check enable
* bit 7: PGE Enable global pages
* bit 8: PCE Enable performance counters at IPL3
*/
ERR("mov cr4,eax at 0x%08x\n",context->Eip);
context->Eax = 0;
context->Eip += prefixlen+3;
return ExceptionContinueExecution;
case 0xc0: /* mov cr0, eax */
ERR("mov cr0,eax at 0x%08x\n",context->Eip);
context->Eax = 0x10; /* FIXME: set more bits ? */
context->Eip += prefixlen+3;
return ExceptionContinueExecution;
default: /* fallthrough to illegal instruction */
break;
}
/* fallthrough to illegal instruction */
break;
case 0x21: /* mov drX, eax */
switch (instr[2])
{
case 0xc8: /* mov dr1, eax */
TRACE("mov dr1,eax at 0x%08x\n",context->Eip);
context->Eax = context->Dr1;
context->Eip += prefixlen+3;
return ExceptionContinueExecution;
case 0xf8: /* mov dr7, eax */
TRACE("mov dr7,eax at 0x%08x\n",context->Eip);
context->Eax = 0x400;
context->Eip += prefixlen+3;
return ExceptionContinueExecution;
}
ERR("Unsupported DR register, eip+2 is %02x\n", instr[2]);
/* fallthrough to illegal instruction */
break;
case 0x23: /* mov eax drX */
switch (instr[2])
{
case 0xc8: /* mov eax, dr1 */
context->Dr1 = context->Eax;
context->Eip += prefixlen+3;
return ExceptionContinueExecution;
}
ERR("Unsupported DR register, eip+2 is %02x\n", instr[2]);
/* fallthrough to illegal instruction */
break;
case 0xa1: /* pop fs */
{
WORD seg = *(WORD *)get_stack( context );
if (INSTR_ReplaceSelector( context, &seg ))
{
context->SegFs = seg;
add_stack(context, long_op ? 4 : 2);
context->Eip += prefixlen + 2;
return ExceptionContinueExecution;
}
}
break;
case 0xa9: /* pop gs */
{
WORD seg = *(WORD *)get_stack( context );
if (INSTR_ReplaceSelector( context, &seg ))
{
context->SegGs = seg;
add_stack(context, long_op ? 4 : 2);
context->Eip += prefixlen + 2;
return ExceptionContinueExecution;
}
}
break;
case 0xb2: /* lss addr,reg */
case 0xb4: /* lfs addr,reg */
case 0xb5: /* lgs addr,reg */
if (INSTR_EmulateLDS( context, instr, long_op,
long_addr, segprefix, &len ))
{
context->Eip += prefixlen + len;
return ExceptionContinueExecution;
}
break;
}
break; /* Unable to emulate it */
case 0x6c: /* insb */
case 0x6d: /* insw/d */
case 0x6e: /* outsb */
case 0x6f: /* outsw/d */
{
int typ = *instr; /* Just in case it's overwritten. */
int outp = (typ >= 0x6e);
unsigned long count = repX ?
(long_addr ? context->Ecx : LOWORD(context->Ecx)) : 1;
int opsize = (typ & 1) ? (long_op ? 4 : 2) : 1;
int step = (context->EFlags & 0x400) ? -opsize : +opsize;
int seg = outp ? context->SegDs : context->SegEs; /* FIXME: is this right? */
if (outp)
/* FIXME: Check segment is readable. */
(void)0;
else
/* FIXME: Check segment is writable. */
(void)0;
if (repX)
{
if (long_addr) context->Ecx = 0;
else SET_LOWORD(context->Ecx,0);
}
while (count-- > 0)
{
void *data;
WORD dx = LOWORD(context->Edx);
if (outp)
{
data = make_ptr( context, seg, context->Esi, long_addr );
if (long_addr) context->Esi += step;
else ADD_LOWORD(context->Esi,step);
}
else
{
data = make_ptr( context, seg, context->Edi, long_addr );
if (long_addr) context->Edi += step;
else ADD_LOWORD(context->Edi,step);
}
switch (typ)
{
case 0x6c:
*(BYTE *)data = INSTR_inport( dx, 1, context );
break;
case 0x6d:
if (long_op)
*(DWORD *)data = INSTR_inport( dx, 4, context );
else
*(WORD *)data = INSTR_inport( dx, 2, context );
break;
case 0x6e:
INSTR_outport( dx, 1, *(BYTE *)data, context );
break;
case 0x6f:
if (long_op)
INSTR_outport( dx, 4, *(DWORD *)data, context );
else
INSTR_outport( dx, 2, *(WORD *)data, context );
break;
}
}
context->Eip += prefixlen + 1;
}
return ExceptionContinueExecution;
case 0x8b: /* mov Ev, Gv */
{
BYTE *addr = INSTR_GetOperandAddr(context, instr + 1, long_addr,
segprefix, &len);
struct idtr idtr = get_idtr();
unsigned int offset = addr - idtr.base;
if (offset <= idtr.limit + 1 - (long_op ? 4 : 2))
{
idt[1].LimitLow = 0x100; /* FIXME */
idt[2].LimitLow = 0x11E; /* FIXME */
idt[3].LimitLow = 0x500; /* FIXME */
store_reg( context, instr[1], (BYTE *)&idt + offset, long_op );
context->Eip += prefixlen + len + 1;
return ExceptionContinueExecution;
}
}
break; /* Unable to emulate it */
case 0x8e: /* mov XX,segment_reg */
{
WORD seg;
BYTE *addr = INSTR_GetOperandAddr(context, instr + 1,
long_addr, segprefix, &len );
if (!addr)
break; /* Unable to emulate it */
seg = *(WORD *)addr;
if (!INSTR_ReplaceSelector( context, &seg ))
break; /* Unable to emulate it */
switch((instr[1] >> 3) & 7)
{
case 0:
context->SegEs = seg;
context->Eip += prefixlen + len + 1;
return ExceptionContinueExecution;
case 1: /* cs */
break;
case 2:
context->SegSs = seg;
context->Eip += prefixlen + len + 1;
return ExceptionContinueExecution;
case 3:
context->SegDs = seg;
context->Eip += prefixlen + len + 1;
return ExceptionContinueExecution;
case 4:
context->SegFs = seg;
context->Eip += prefixlen + len + 1;
return ExceptionContinueExecution;
case 5:
context->SegGs = seg;
context->Eip += prefixlen + len + 1;
return ExceptionContinueExecution;
case 6: /* unused */
case 7: /* unused */
break;
}
}
break; /* Unable to emulate it */
case 0xc4: /* les addr,reg */
case 0xc5: /* lds addr,reg */
if (INSTR_EmulateLDS( context, instr, long_op,
long_addr, segprefix, &len ))
{
context->Eip += prefixlen + len;
return ExceptionContinueExecution;
}
break; /* Unable to emulate it */
case 0xcd: /* int <XX> */
if (wine_ldt_is_system(context->SegCs)) break; /* don't emulate it in 32-bit code */
if (!winedos.EmulateInterruptPM) load_winedos();
if (winedos.EmulateInterruptPM)
{
context->Eip += prefixlen + 2;
winedos.EmulateInterruptPM( context, instr[1] );
return ExceptionContinueExecution;
}
break; /* Unable to emulate it */
case 0xcf: /* iret */
if (wine_ldt_is_system(context->SegCs)) break; /* don't emulate it in 32-bit code */
if (long_op)
{
DWORD *stack = get_stack( context );
context->Eip = *stack++;
context->SegCs = *stack++;
context->EFlags = *stack;
add_stack(context, 3*sizeof(DWORD)); /* Pop the return address and flags */
}
else
{
WORD *stack = get_stack( context );
context->Eip = *stack++;
context->SegCs = *stack++;
SET_LOWORD(context->EFlags,*stack);
add_stack(context, 3*sizeof(WORD)); /* Pop the return address and flags */
}
return ExceptionContinueExecution;
case 0xe4: /* inb al,XX */
SET_LOBYTE(context->Eax,INSTR_inport( instr[1], 1, context ));
context->Eip += prefixlen + 2;
return ExceptionContinueExecution;
case 0xe5: /* in (e)ax,XX */
if (long_op)
context->Eax = INSTR_inport( instr[1], 4, context );
else
SET_LOWORD(context->Eax, INSTR_inport( instr[1], 2, context ));
context->Eip += prefixlen + 2;
return ExceptionContinueExecution;
case 0xe6: /* outb XX,al */
INSTR_outport( instr[1], 1, LOBYTE(context->Eax), context );
context->Eip += prefixlen + 2;
return ExceptionContinueExecution;
case 0xe7: /* out XX,(e)ax */
if (long_op)
INSTR_outport( instr[1], 4, context->Eax, context );
else
INSTR_outport( instr[1], 2, LOWORD(context->Eax), context );
context->Eip += prefixlen + 2;
return ExceptionContinueExecution;
case 0xec: /* inb al,dx */
SET_LOBYTE(context->Eax, INSTR_inport( LOWORD(context->Edx), 1, context ) );
context->Eip += prefixlen + 1;
return ExceptionContinueExecution;
case 0xed: /* in (e)ax,dx */
if (long_op)
context->Eax = INSTR_inport( LOWORD(context->Edx), 4, context );
else
SET_LOWORD(context->Eax, INSTR_inport( LOWORD(context->Edx), 2, context ));
context->Eip += prefixlen + 1;
return ExceptionContinueExecution;
case 0xee: /* outb dx,al */
INSTR_outport( LOWORD(context->Edx), 1, LOBYTE(context->Eax), context );
context->Eip += prefixlen + 1;
return ExceptionContinueExecution;
case 0xef: /* out dx,(e)ax */
if (long_op)
INSTR_outport( LOWORD(context->Edx), 4, context->Eax, context );
else
INSTR_outport( LOWORD(context->Edx), 2, LOWORD(context->Eax), context );
context->Eip += prefixlen + 1;
return ExceptionContinueExecution;
case 0xfa: /* cli */
NtCurrentTeb()->dpmi_vif = 0;
context->Eip += prefixlen + 1;
return ExceptionContinueExecution;
case 0xfb: /* sti */
NtCurrentTeb()->dpmi_vif = 1;
context->Eip += prefixlen + 1;
if (NtCurrentTeb()->vm86_pending)
{
NtCurrentTeb()->vm86_pending = 0;
rec->ExceptionCode = EXCEPTION_VM86_STI;
break; /* Handle the pending event. */
}
return ExceptionContinueExecution;
}
return ExceptionContinueSearch; /* Unable to emulate it */
}
/***********************************************************************
* INSTR_vectored_handler
*
* Vectored exception handler used to emulate protected instructions
* from 32-bit code.
*/
LONG CALLBACK INSTR_vectored_handler( EXCEPTION_POINTERS *ptrs )
{
EXCEPTION_RECORD *record = ptrs->ExceptionRecord;
CONTEXT86 *context = ptrs->ContextRecord;
if (wine_ldt_is_system(context->SegCs) &&
(record->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
record->ExceptionCode == EXCEPTION_PRIV_INSTRUCTION))
{
if (__wine_emulate_instruction( record, context ) == ExceptionContinueExecution)
return EXCEPTION_CONTINUE_EXECUTION;
}
return EXCEPTION_CONTINUE_SEARCH;
}
/***********************************************************************
* INSTR_CallBuiltinHandler
*/
void INSTR_CallBuiltinHandler( CONTEXT86 *context, BYTE intnum )
{
if (!winedos.CallBuiltinHandler) load_winedos();
if (winedos.CallBuiltinHandler) winedos.CallBuiltinHandler( context, intnum );
}
/***********************************************************************
* DOS3Call (KERNEL.102)
*/
void WINAPI DOS3Call( CONTEXT86 *context )
{
INSTR_CallBuiltinHandler( context, 0x21 );
}
/***********************************************************************
* NetBIOSCall (KERNEL.103)
*/
void WINAPI NetBIOSCall16( CONTEXT86 *context )
{
INSTR_CallBuiltinHandler( context, 0x5c );
}
/***********************************************************************
* GetSetKernelDOSProc (KERNEL.311)
*/
FARPROC16 WINAPI GetSetKernelDOSProc16( FARPROC16 DosProc )
{
FIXME("(DosProc=%p): stub\n", DosProc);
return NULL;
}
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