799 lines
25 KiB
C
799 lines
25 KiB
C
/*
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* Emulation of priviledged instructions
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*
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* Copyright 1995 Alexandre Julliard
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*/
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#include "windef.h"
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#include "wingdi.h"
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#include "wine/winuser16.h"
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#include "ldt.h"
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#include "global.h"
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#include "module.h"
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#include "miscemu.h"
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#include "selectors.h"
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#include "debugtools.h"
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DEFAULT_DEBUG_CHANNEL(int);
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DECLARE_DEBUG_CHANNEL(io);
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#ifdef __i386__
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inline static void add_stack( CONTEXT86 *context, int offset )
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{
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if (ISV86(context) || !IS_SELECTOR_32BIT(context->SegSs))
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ADD_LOWORD( context->Esp, offset );
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else
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context->Esp += offset;
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}
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inline static void *make_ptr( CONTEXT86 *context, DWORD seg, DWORD off, int long_addr )
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{
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if (ISV86(context)) return PTR_REAL_TO_LIN( seg, off );
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if (IS_SELECTOR_SYSTEM(seg)) return (void *)off;
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if (!long_addr) off = LOWORD(off);
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return PTR_SEG_OFF_TO_LIN( seg, off );
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}
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inline static void *get_stack( CONTEXT86 *context )
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{
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if (ISV86(context))
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return PTR_REAL_TO_LIN( context->SegSs, context->Esp );
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if (IS_SELECTOR_SYSTEM(context->SegSs))
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return (void *)context->Esp;
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if (IS_SELECTOR_32BIT(context->SegSs))
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return PTR_SEG_OFF_TO_LIN( context->SegSs, context->Esp );
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return PTR_SEG_OFF_TO_LIN( context->SegSs, LOWORD(context->Esp) );
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}
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/***********************************************************************
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* INSTR_ReplaceSelector
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*
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* Try to replace an invalid selector by a valid one.
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* The only selector where it is allowed to do "mov ax,40;mov es,ax"
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* is the so called 'bimodal' selector 0x40, which points to the BIOS
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* data segment. Used by (at least) Borland products (and programs compiled
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* using Borland products).
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*
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* See Undocumented Windows, Chapter 5, __0040.
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*/
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static BOOL INSTR_ReplaceSelector( CONTEXT86 *context, WORD *sel )
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{
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extern char Call16_Start, Call16_End;
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if (IS_SELECTOR_SYSTEM(context->SegCs))
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if ( (char *)context->Eip >= &Call16_Start
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&& (char *)context->Eip < &Call16_End )
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{
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/* Saved selector may have become invalid when the relay code */
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/* tries to restore it. We simply clear it. */
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*sel = 0;
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return TRUE;
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}
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if (*sel == 0x40)
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{
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static WORD sys_timer = 0;
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if (!sys_timer)
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sys_timer = CreateSystemTimer( 55, DOSMEM_Tick );
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*sel = DOSMEM_BiosDataSeg;
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return TRUE;
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}
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if (!IS_SELECTOR_SYSTEM(*sel) && !IS_SELECTOR_FREE(*sel))
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ERR("Got protection fault on valid selector, maybe your kernel is too old?\n" );
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return FALSE; /* Can't replace selector, crashdump */
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}
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/***********************************************************************
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* INSTR_GetOperandAddr
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*
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* Return the address of an instruction operand (from the mod/rm byte).
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*/
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static BYTE *INSTR_GetOperandAddr( CONTEXT86 *context, BYTE *instr,
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int long_addr, int segprefix, int *len )
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{
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int mod, rm, base, index = 0, ss = 0, seg = 0, off;
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#define GET_VAL(val,type) \
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{ *val = *(type *)instr; instr += sizeof(type); *len += sizeof(type); }
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*len = 0;
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GET_VAL( &mod, BYTE );
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rm = mod & 7;
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mod >>= 6;
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if (mod == 3)
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{
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switch(rm)
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{
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case 0: return (BYTE *)&context->Eax;
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case 1: return (BYTE *)&context->Ecx;
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case 2: return (BYTE *)&context->Edx;
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case 3: return (BYTE *)&context->Ebx;
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case 4: return (BYTE *)&context->Esp;
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case 5: return (BYTE *)&context->Ebp;
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case 6: return (BYTE *)&context->Esi;
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case 7: return (BYTE *)&context->Edi;
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}
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}
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if (long_addr)
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{
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if (rm == 4)
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{
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BYTE sib;
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GET_VAL( &sib, BYTE );
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rm = sib & 7;
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ss = sib >> 6;
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switch(sib >> 3)
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{
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case 0: index = context->Eax; break;
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case 1: index = context->Ecx; break;
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case 2: index = context->Edx; break;
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case 3: index = context->Ebx; break;
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case 4: index = 0; break;
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case 5: index = context->Ebp; break;
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case 6: index = context->Esi; break;
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case 7: index = context->Edi; break;
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}
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}
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switch(rm)
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{
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case 0: base = context->Eax; seg = context->SegDs; break;
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case 1: base = context->Ecx; seg = context->SegDs; break;
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case 2: base = context->Edx; seg = context->SegDs; break;
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case 3: base = context->Ebx; seg = context->SegDs; break;
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case 4: base = context->Esp; seg = context->SegSs; break;
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case 5: base = context->Ebp; seg = context->SegSs; break;
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case 6: base = context->Esi; seg = context->SegDs; break;
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case 7: base = context->Edi; seg = context->SegDs; break;
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}
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switch (mod)
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{
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case 0:
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if (rm == 5) /* special case: ds:(disp32) */
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{
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GET_VAL( &base, DWORD );
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seg = context->SegDs;
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}
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break;
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case 1: /* 8-bit disp */
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GET_VAL( &off, BYTE );
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base += (signed char)off;
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break;
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case 2: /* 32-bit disp */
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GET_VAL( &off, DWORD );
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base += (signed long)off;
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break;
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}
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}
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else /* short address */
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{
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switch(rm)
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{
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case 0: /* ds:(bx,si) */
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base = LOWORD(context->Ebx) + LOWORD(context->Esi);
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seg = context->SegDs;
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break;
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case 1: /* ds:(bx,di) */
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base = LOWORD(context->Ebx) + LOWORD(context->Edi);
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seg = context->SegDs;
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break;
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case 2: /* ss:(bp,si) */
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base = LOWORD(context->Ebp) + LOWORD(context->Esi);
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seg = context->SegSs;
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break;
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case 3: /* ss:(bp,di) */
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base = LOWORD(context->Ebp) + LOWORD(context->Edi);
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seg = context->SegSs;
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break;
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case 4: /* ds:(si) */
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base = LOWORD(context->Esi);
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seg = context->SegDs;
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break;
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case 5: /* ds:(di) */
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base = LOWORD(context->Edi);
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seg = context->SegDs;
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break;
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case 6: /* ss:(bp) */
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base = LOWORD(context->Ebp);
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seg = context->SegSs;
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break;
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case 7: /* ds:(bx) */
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base = LOWORD(context->Ebx);
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seg = context->SegDs;
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break;
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}
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switch(mod)
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{
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case 0:
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if (rm == 6) /* special case: ds:(disp16) */
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{
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GET_VAL( &base, WORD );
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seg = context->SegDs;
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}
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break;
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case 1: /* 8-bit disp */
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GET_VAL( &off, BYTE );
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base += (signed char)off;
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break;
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case 2: /* 16-bit disp */
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GET_VAL( &off, WORD );
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base += (signed short)off;
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break;
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}
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base &= 0xffff;
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}
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if (segprefix != -1) seg = segprefix;
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/* Make sure the segment and offset are valid */
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if (IS_SELECTOR_SYSTEM(seg)) return (BYTE *)(base + (index << ss));
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if (((seg & 7) != 7) || IS_SELECTOR_FREE(seg)) return NULL;
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if (GET_SEL_LIMIT(seg) < (base + (index << ss))) return NULL;
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return (BYTE *)PTR_SEG_OFF_TO_LIN( seg, (base + (index << ss)) );
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#undef GET_VAL
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}
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/***********************************************************************
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* INSTR_EmulateLDS
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*
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* Emulate the LDS (and LES,LFS,etc.) instruction.
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*/
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static BOOL INSTR_EmulateLDS( CONTEXT86 *context, BYTE *instr, int long_op,
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int long_addr, int segprefix, int *len )
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{
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WORD seg;
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BYTE *regmodrm = instr + 1 + (*instr == 0x0f);
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BYTE *addr = INSTR_GetOperandAddr( context, regmodrm,
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long_addr, segprefix, len );
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if (!addr)
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return FALSE; /* Unable to emulate it */
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seg = *(WORD *)(addr + (long_op ? 4 : 2));
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if (!INSTR_ReplaceSelector( context, &seg ))
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return FALSE; /* Unable to emulate it */
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/* Now store the offset in the correct register */
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switch((*regmodrm >> 3) & 7)
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{
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case 0:
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if (long_op) context->Eax = *(DWORD *)addr;
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else SET_LOWORD(context->Eax,*(WORD *)addr);
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break;
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case 1:
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if (long_op) context->Ecx = *(DWORD *)addr;
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else SET_LOWORD(context->Ecx,*(WORD *)addr);
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break;
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case 2:
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if (long_op) context->Edx = *(DWORD *)addr;
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else SET_LOWORD(context->Edx,*(WORD *)addr);
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break;
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case 3:
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if (long_op) context->Ebx = *(DWORD *)addr;
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else SET_LOWORD(context->Ebx,*(WORD *)addr);
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break;
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case 4:
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if (long_op) context->Esp = *(DWORD *)addr;
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else SET_LOWORD(context->Esp,*(WORD *)addr);
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break;
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case 5:
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if (long_op) context->Ebp = *(DWORD *)addr;
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else SET_LOWORD(context->Ebp,*(WORD *)addr);
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break;
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case 6:
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if (long_op) context->Esi = *(DWORD *)addr;
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else SET_LOWORD(context->Esi,*(WORD *)addr);
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break;
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case 7:
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if (long_op) context->Edi = *(DWORD *)addr;
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else SET_LOWORD(context->Edi,*(WORD *)addr);
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break;
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}
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/* Store the correct segment in the segment register */
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switch(*instr)
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{
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case 0xc4: context->SegEs = seg; break; /* les */
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case 0xc5: context->SegDs = seg; break; /* lds */
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case 0x0f: switch(instr[1])
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{
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case 0xb2: context->SegSs = seg; break; /* lss */
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case 0xb4: context->SegFs = seg; break; /* lfs */
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case 0xb5: context->SegGs = seg; break; /* lgs */
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}
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break;
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}
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/* Add the opcode size to the total length */
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*len += 1 + (*instr == 0x0f);
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return TRUE;
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}
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/***********************************************************************
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* INSTR_inport
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*
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* input on a I/O port
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*/
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static DWORD INSTR_inport( WORD port, int size, CONTEXT86 *context )
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{
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DWORD res = IO_inport( port, size );
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if (TRACE_ON(io))
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{
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switch(size)
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{
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case 1:
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DPRINTF( "0x%x < %02x @ %04x:%04x\n", port, LOBYTE(res),
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(WORD)context->SegCs, LOWORD(context->Eip));
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break;
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case 2:
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DPRINTF( "0x%x < %04x @ %04x:%04x\n", port, LOWORD(res),
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(WORD)context->SegCs, LOWORD(context->Eip));
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break;
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case 4:
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DPRINTF( "0x%x < %08lx @ %04x:%04x\n", port, res,
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(WORD)context->SegCs, LOWORD(context->Eip));
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break;
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}
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}
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return res;
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}
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/***********************************************************************
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* INSTR_outport
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*
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* output on a I/O port
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*/
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static void INSTR_outport( WORD port, int size, DWORD val, CONTEXT86 *context )
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{
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IO_outport( port, size, val );
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if (TRACE_ON(io))
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{
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switch(size)
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{
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case 1:
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DPRINTF("0x%x > %02x @ %04x:%04x\n", port, LOBYTE(val),
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(WORD)context->SegCs, LOWORD(context->Eip));
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break;
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case 2:
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DPRINTF("0x%x > %04x @ %04x:%04x\n", port, LOWORD(val),
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(WORD)context->SegCs, LOWORD(context->Eip));
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break;
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case 4:
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DPRINTF("0x%x > %08lx @ %04x:%04x\n", port, val,
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(WORD)context->SegCs, LOWORD(context->Eip));
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break;
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}
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}
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}
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/***********************************************************************
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* INSTR_EmulateInstruction
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*
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* Emulate a priviledged instruction. Returns TRUE if emulation successful.
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*/
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BOOL INSTR_EmulateInstruction( CONTEXT86 *context )
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{
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int prefix, segprefix, prefixlen, len, repX, long_op, long_addr;
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SEGPTR gpHandler;
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BYTE *instr;
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long_op = long_addr = (!ISV86(context) && IS_SELECTOR_32BIT(context->SegCs));
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instr = make_ptr( context, context->SegCs, context->Eip, TRUE );
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if (!instr) return FALSE;
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/* First handle any possible prefix */
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segprefix = -1; /* no prefix */
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prefix = 1;
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repX = 0;
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prefixlen = 0;
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while(prefix)
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{
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switch(*instr)
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{
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case 0x2e:
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segprefix = context->SegCs;
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break;
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case 0x36:
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segprefix = context->SegSs;
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break;
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case 0x3e:
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segprefix = context->SegDs;
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break;
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case 0x26:
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segprefix = context->SegEs;
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break;
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case 0x64:
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segprefix = context->SegFs;
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break;
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case 0x65:
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segprefix = context->SegGs;
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break;
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case 0x66:
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long_op = !long_op; /* opcode size prefix */
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break;
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case 0x67:
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long_addr = !long_addr; /* addr size prefix */
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break;
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case 0xf0: /* lock */
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break;
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case 0xf2: /* repne */
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repX = 1;
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break;
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case 0xf3: /* repe */
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repX = 2;
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break;
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default:
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prefix = 0; /* no more prefixes */
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break;
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}
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if (prefix)
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{
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instr++;
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prefixlen++;
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}
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}
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/* Now look at the actual instruction */
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switch(*instr)
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{
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case 0x07: /* pop es */
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case 0x17: /* pop ss */
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case 0x1f: /* pop ds */
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{
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WORD seg = *(WORD *)get_stack( context );
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if (INSTR_ReplaceSelector( context, &seg ))
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{
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switch(*instr)
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{
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case 0x07: context->SegEs = seg; break;
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case 0x17: context->SegSs = seg; break;
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case 0x1f: context->SegDs = seg; break;
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}
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add_stack(context, long_op ? 4 : 2);
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context->Eip += prefixlen + 1;
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return TRUE;
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}
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}
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break; /* Unable to emulate it */
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|
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case 0x0f: /* extended instruction */
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switch(instr[1])
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{
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case 0x22: /* mov eax, crX */
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switch (instr[2]) {
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case 0xc0:
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ERR("mov eax,cr0 at 0x%08lx, EAX=0x%08lx\n",
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context->Eip,context->Eax );
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context->Eip += prefixlen+3;
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return TRUE;
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default:
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break; /*fallthrough to bad instruction handling */
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}
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break; /*fallthrough to bad instruction handling */
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case 0x20: /* mov crX, eax */
|
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switch (instr[2]) {
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case 0xe0: /* mov cr4, eax */
|
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/* CR4 register . See linux/arch/i386/mm/init.c, X86_CR4_ defs
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* bit 0: VME Virtual Mode Exception ?
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* bit 1: PVI Protected mode Virtual Interrupt
|
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* bit 2: TSD Timestamp disable
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* bit 3: DE Debugging extensions
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* bit 4: PSE Page size extensions
|
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* bit 5: PAE Physical address extension
|
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* bit 6: MCE Machine check enable
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* bit 7: PGE Enable global pages
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* bit 8: PCE Enable performance counters at IPL3
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*/
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ERR("mov cr4,eax at 0x%08lx\n",context->Eip);
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context->Eax = 0;
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context->Eip += prefixlen+3;
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return TRUE;
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case 0xc0: /* mov cr0, eax */
|
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ERR("mov cr0,eax at 0x%08lx\n",context->Eip);
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context->Eax = 0x10; /* FIXME: set more bits ? */
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context->Eip += prefixlen+3;
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return TRUE;
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default: /* fallthrough to illegal instruction */
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break;
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}
|
|
/* fallthrough to illegal instruction */
|
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break;
|
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case 0xa1: /* pop fs */
|
|
{
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WORD seg = *(WORD *)get_stack( context );
|
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if (INSTR_ReplaceSelector( context, &seg ))
|
|
{
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context->SegFs = seg;
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add_stack(context, long_op ? 4 : 2);
|
|
context->Eip += prefixlen + 2;
|
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return TRUE;
|
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}
|
|
}
|
|
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 TRUE;
|
|
}
|
|
}
|
|
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 TRUE;
|
|
}
|
|
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 readable. */
|
|
(void)0;
|
|
else
|
|
/* FIXME: Check segment writeable. */
|
|
(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 TRUE;
|
|
|
|
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 TRUE;
|
|
case 1: /* cs */
|
|
break;
|
|
case 2:
|
|
context->SegSs = seg;
|
|
context->Eip += prefixlen + len + 1;
|
|
return TRUE;
|
|
case 3:
|
|
context->SegDs = seg;
|
|
context->Eip += prefixlen + len + 1;
|
|
return TRUE;
|
|
case 4:
|
|
context->SegFs = seg;
|
|
context->Eip += prefixlen + len + 1;
|
|
return TRUE;
|
|
case 5:
|
|
context->SegGs = seg;
|
|
context->Eip += prefixlen + len + 1;
|
|
return TRUE;
|
|
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 TRUE;
|
|
}
|
|
break; /* Unable to emulate it */
|
|
|
|
case 0xcd: /* int <XX> */
|
|
if (long_op)
|
|
{
|
|
ERR("int xx from 32-bit code is not supported.\n");
|
|
break; /* Unable to emulate it */
|
|
}
|
|
else
|
|
{
|
|
FARPROC16 addr = INT_GetPMHandler( instr[1] );
|
|
WORD *stack = get_stack( context );
|
|
if (!addr)
|
|
{
|
|
FIXME("no handler for interrupt %02x, ignoring it\n", instr[1]);
|
|
context->Eip += prefixlen + 2;
|
|
return TRUE;
|
|
}
|
|
/* Push the flags and return address on the stack */
|
|
*(--stack) = LOWORD(context->EFlags);
|
|
*(--stack) = context->SegCs;
|
|
*(--stack) = LOWORD(context->Eip) + prefixlen + 2;
|
|
add_stack(context, -3 * sizeof(WORD));
|
|
/* Jump to the interrupt handler */
|
|
context->SegCs = HIWORD(addr);
|
|
context->Eip = LOWORD(addr);
|
|
}
|
|
return TRUE;
|
|
|
|
case 0xcf: /* iret */
|
|
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 TRUE;
|
|
|
|
case 0xe4: /* inb al,XX */
|
|
SET_LOBYTE(context->Eax,INSTR_inport( instr[1], 1, context ));
|
|
context->Eip += prefixlen + 2;
|
|
return TRUE;
|
|
|
|
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 TRUE;
|
|
|
|
case 0xe6: /* outb XX,al */
|
|
INSTR_outport( instr[1], 1, LOBYTE(context->Eax), context );
|
|
context->Eip += prefixlen + 2;
|
|
return TRUE;
|
|
|
|
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 TRUE;
|
|
|
|
case 0xec: /* inb al,dx */
|
|
SET_LOBYTE(context->Eax, INSTR_inport( LOWORD(context->Edx), 1, context ) );
|
|
context->Eip += prefixlen + 1;
|
|
return TRUE;
|
|
|
|
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 TRUE;
|
|
|
|
case 0xee: /* outb dx,al */
|
|
INSTR_outport( LOWORD(context->Edx), 1, LOBYTE(context->Eax), context );
|
|
context->Eip += prefixlen + 1;
|
|
return TRUE;
|
|
|
|
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 TRUE;
|
|
|
|
case 0xfa: /* cli, ignored */
|
|
context->Eip += prefixlen + 1;
|
|
return TRUE;
|
|
|
|
case 0xfb: /* sti, ignored */
|
|
context->Eip += prefixlen + 1;
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/* Check for Win16 __GP handler */
|
|
gpHandler = HasGPHandler16( PTR_SEG_OFF_TO_SEGPTR( context->SegCs, context->Eip ) );
|
|
if (gpHandler)
|
|
{
|
|
WORD *stack = get_stack( context );
|
|
*--stack = context->SegCs;
|
|
*--stack = context->Eip;
|
|
add_stack(context, -2*sizeof(WORD));
|
|
|
|
context->SegCs = SELECTOROF( gpHandler );
|
|
context->Eip = OFFSETOF( gpHandler );
|
|
return TRUE;
|
|
}
|
|
return FALSE; /* Unable to emulate it */
|
|
}
|
|
|
|
#endif /* __i386__ */
|