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310 lines
3.1 KiB
310 lines
3.1 KiB
/*++
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Copyright (c) 1994 Microsoft Corporation
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Module Name:
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condops.c
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Abstract:
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This module implements the code to emulate condition code 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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XmClcOp (
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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 clc opcode.
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Arguments:
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P - Supplies a pointer to an emulator 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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// Clear carry flag.
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//
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P->Eflags.CF = 0;
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return;
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}
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VOID
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XmCldOp (
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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 cld opcode.
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Arguments:
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P - Supplies a pointer to an emulator 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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// Clear direction flag.
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//
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P->Eflags.DF = 0;
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return;
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}
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VOID
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XmCliOp (
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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 cli opcode.
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Arguments:
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P - Supplies a pointer to an emulator 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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// Clear interrupt flag.
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//
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P->Eflags.IF = 0;
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return;
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}
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VOID
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XmCmcOp (
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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 cmc opcode.
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Arguments:
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P - Supplies a pointer to an emulator 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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// Complement carry flag.
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//
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P->Eflags.CF ^= 1;
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return;
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}
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VOID
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XmStcOp (
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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 stc opcode.
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Arguments:
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P - Supplies a pointer to an emulator 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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// Set carry flag.
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//
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P->Eflags.CF = 1;
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return;
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}
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VOID
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XmStdOp (
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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 std opcode.
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Arguments:
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P - Supplies a pointer to an emulator 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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// Set direction flag.
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//
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P->Eflags.DF = 1;
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return;
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}
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VOID
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XmStiOp (
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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 sti opcode.
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Arguments:
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P - Supplies a pointer to an emulator 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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// Set interrupt flag.
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//
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P->Eflags.IF = 1;
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return;
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}
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VOID
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XmLahfOp (
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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 lahf opcode.
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Arguments:
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P - Supplies a pointer to an emulator 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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// Load flags into AH.
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//
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P->DataType = BYTE_DATA;
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P->DstByte = &P->Gpr[AX].Xh;
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XmStoreResult(P, (ULONG)P->AhFlags);
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return;
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}
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VOID
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XmSahfOp (
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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 sahf opcode.
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Arguments:
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P - Supplies a pointer to an emulator 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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// Store CF, PF, AF, ZF, SF of AH in flags.
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//
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P->AhFlags = P->Gpr[AX].Xh;
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P->Eflags.MBO = 1;
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P->Eflags.SBZ0 = 0;
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P->Eflags.SBZ1 = 0;
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return;
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}
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