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/*++
Copyright (c) 1994 Microsoft Corporation
Module Name:
movops.c
Abstract:
This module implements the code to emulate the move and exchange
opcodes.
Author:
David N. Cutler (davec) 22-Sep-1994
Environment:
Kernel mode only.
Revision History:
--*/
#include "nthal.h"
#include "emulate.h"
VOID
XmCbwOp (
IN PRXM_CONTEXT P
)
/*++
Routine Description:
This function emulates a cbw opcode.
Arguments:
P - Supplies a pointer to the emulation context structure.
Return Value:
None.
--*/
{
//
// Sign extend byte to word or word to double.
//
P->DstLong = (ULONG UNALIGNED *)(&P->Gpr[EAX].Exx);
if (P->OpsizePrefixActive != FALSE) {
P->DataType = LONG_DATA;
XmStoreResult(P, (ULONG)((LONG)((SHORT)P->Gpr[AX].Xx)));
} else {
P->DataType = WORD_DATA;
XmStoreResult(P, (ULONG)((USHORT)((SCHAR)P->Gpr[AL].Xl)));
}
return;
}
VOID
XmCwdOp (
IN PRXM_CONTEXT P
)
/*++
Routine Description:
This function emulates a cwd opcode.
Arguments:
P - Supplies a pointer to the emulation context structure.
Return Value:
None.
--*/
{
//
// Sign extend word to double or double to quad.
//
P->DstLong = (ULONG UNALIGNED *)(&P->Gpr[EDX].Exx);
if (P->OpsizePrefixActive != FALSE) {
P->DataType = LONG_DATA;
XmStoreResult(P, (ULONG)((LONG)P->Gpr[EAX].Exx >> 31));
} else {
P->DataType = WORD_DATA;
XmStoreResult(P, (ULONG)((USHORT)((SHORT)P->Gpr[AX].Xx >> 16)));
}
return;
}
VOID
XmMovOp (
IN PRXM_CONTEXT P
)
/*++
Routine Description:
This function emulates a move general opcode.
Arguments:
P - Supplies a pointer to the emulation context structure.
Return Value:
None.
--*/
{
//
// Move source to destination.
//
XmStoreResult(P, P->SrcValue.Long);
return;
}
VOID
XmXchgOp (
IN PRXM_CONTEXT P
)
/*++
Routine Description:
This function emulates a xchg opcode.
Arguments:
P - Supplies a pointer to the emulation context structure.
Return Value:
None.
--*/
{
//
// Exchange source with destination.
//
if (P->DataType == BYTE_DATA) {
*P->SrcByte = P->DstValue.Byte;
} else if (P->DataType == LONG_DATA) {
*P->SrcLong = P->DstValue.Long;
} else {
*P->SrcWord = P->DstValue.Word;
}
XmStoreResult(P, P->SrcValue.Long);
return;
}
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