134 lines
2 KiB
C
134 lines
2 KiB
C
/*++
|
||
|
||
Copyright (c) 1994 Microsoft Corporation
|
||
|
||
Module Name:
|
||
|
||
setops.c
|
||
|
||
Abstract:
|
||
|
||
This module implements the code to emulate set opcodes.
|
||
|
||
Author:
|
||
|
||
David N. Cutler (davec) 13-Sep-1994
|
||
|
||
Environment:
|
||
|
||
Kernel mode only.
|
||
|
||
Revision History:
|
||
|
||
--*/
|
||
|
||
#include "nthal.h"
|
||
#include "emulate.h"
|
||
|
||
VOID
|
||
XmSxxOp (
|
||
IN PRXM_CONTEXT P
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This function emulates set byte on condition opcodes.
|
||
|
||
Arguments:
|
||
|
||
P - Supplies a pointer to the emulation context structure.
|
||
|
||
Return Value:
|
||
|
||
None.
|
||
|
||
--*/
|
||
|
||
{
|
||
|
||
ULONG Complement;
|
||
ULONG Condition;
|
||
|
||
//
|
||
// Case on the set control value.
|
||
//
|
||
|
||
Complement = P->SrcValue.Long & 1;
|
||
switch (P->SrcValue.Long >> 1) {
|
||
|
||
//
|
||
// Set if overflow/not overflow.
|
||
//
|
||
|
||
case 0:
|
||
Condition = P->Eflags.EFLAG_OF;
|
||
break;
|
||
|
||
//
|
||
// Set if below/not below.
|
||
//
|
||
|
||
case 1:
|
||
Condition = P->Eflags.EFLAG_CF;
|
||
break;
|
||
|
||
//
|
||
// Set if zero/not zero.
|
||
//
|
||
|
||
case 2:
|
||
Condition = P->Eflags.EFLAG_ZF;
|
||
break;
|
||
|
||
//
|
||
// Set if below or equal/not below or equal.
|
||
//
|
||
|
||
case 3:
|
||
Condition = P->Eflags.EFLAG_CF | P->Eflags.EFLAG_ZF;
|
||
break;
|
||
|
||
//
|
||
// Set if signed/not signed.
|
||
//
|
||
|
||
case 4:
|
||
Condition = P->Eflags.EFLAG_SF;
|
||
break;
|
||
|
||
//
|
||
// Set if parity/not parity.
|
||
//
|
||
|
||
case 5:
|
||
Condition = P->Eflags.EFLAG_PF;
|
||
break;
|
||
|
||
//
|
||
// Set if less/not less.
|
||
//
|
||
|
||
case 6:
|
||
Condition = (P->Eflags.EFLAG_SF ^ P->Eflags.EFLAG_OF);
|
||
break;
|
||
|
||
//
|
||
// Set if less or equal/not less or equal.
|
||
//
|
||
|
||
case 7:
|
||
Condition = (P->Eflags.EFLAG_SF ^ P->Eflags.EFLAG_OF) | P->Eflags.EFLAG_ZF;
|
||
break;
|
||
}
|
||
|
||
//
|
||
// If the specified condition is met, then set the byte destination
|
||
// value to one. Otherwise, set the byte destination value to zero.
|
||
//
|
||
|
||
XmStoreResult(P, (ULONG)(Condition ^ Complement));
|
||
return;
|
||
}
|