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