196 lines
2.5 KiB
C
196 lines
2.5 KiB
C
/*++
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Copyright (c) 1994 Microsoft Corporation
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Module Name:
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stackops.c
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Abstract:
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This module implements the code to emulate the push, pop, pushf, popf,
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pusha, popa, pushSeg, and popSeg.
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Author:
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David N. Cutler (davec) 6-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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XmPushOp (
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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 push 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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// Push source value onto stack.
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//
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XmPushStack(P, P->SrcValue.Long);
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return;
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}
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VOID
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XmPopOp (
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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 pop 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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// Pop the stack and store the result value.
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//
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XmStoreResult(P, XmPopStack(P));
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return;
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}
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VOID
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XmPushaOp (
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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 pusha 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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ULONG Index;
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ULONG Temp;
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//
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// Push all registers onto the stack.
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//
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if (P->OpsizePrefixActive != FALSE) {
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P->DataType = LONG_DATA;
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} else {
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P->DataType = WORD_DATA;
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}
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Index = EAX;
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Temp = P->Gpr[ESP].Exx;
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do {
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if (Index == ESP) {
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XmSetSourceValue(P, (PVOID)&Temp);
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} else {
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XmSetSourceValue(P, (PVOID)(&P->Gpr[Index].Exx));
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}
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XmPushOp(P);
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Index += 1;
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} while (Index <= EDI);
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return;
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}
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VOID
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XmPopaOp (
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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 popa 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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ULONG Index;
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ULONG Temp;
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//
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// Pop all register from the stack, but skip over ESP.
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//
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if (P->OpsizePrefixActive != FALSE) {
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P->DataType = LONG_DATA;
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} else {
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P->DataType = WORD_DATA;
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}
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Index = EDI + 1;
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Temp = P->Gpr[ESP].Exx;
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do {
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Index -= 1;
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if (Index == ESP) {
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XmSetDestinationValue(P, (PVOID)&Temp);
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} else {
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XmSetDestinationValue(P, (PVOID)(&P->Gpr[Index].Exx));
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}
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XmPopOp(P);
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} while (Index > EAX);
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return;
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}
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