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/*++
Copyright (c) 1994 Microsoft Corporation
Module Name:
stackops.c
Abstract:
This module implements the code to emulate the push, pop, pushf, popf,
pusha, popa, pushSeg, and popSeg.
Author:
David N. Cutler (davec) 6-Sep-1994
Environment:
Kernel mode only.
Revision History:
--*/
#include "nthal.h"
#include "emulate.h"
VOID
XmPushOp (
IN PRXM_CONTEXT P
)
/*++
Routine Description:
This function emulates a push opcode.
Arguments:
P - Supplies a pointer to the emulation context structure.
Return Value:
None.
--*/
{
//
// Push source value onto stack.
//
XmPushStack(P, P->SrcValue.Long);
return;
}
VOID
XmPopOp (
IN PRXM_CONTEXT P
)
/*++
Routine Description:
This function emulates a pop opcode.
Arguments:
P - Supplies a pointer to the emulation context structure.
Return Value:
None.
--*/
{
//
// Pop the stack and store the result value.
//
XmStoreResult(P, XmPopStack(P));
return;
}
VOID
XmPushaOp (
IN PRXM_CONTEXT P
)
/*++
Routine Description:
This function emulates a pusha opcode.
Arguments:
P - Supplies a pointer to the emulation context structure.
Return Value:
None.
--*/
{
ULONG Index;
ULONG Temp;
//
// Push all registers onto the stack.
//
if (P->OpsizePrefixActive != FALSE) {
P->DataType = LONG_DATA;
} else {
P->DataType = WORD_DATA;
}
Index = EAX;
Temp = P->Gpr[ESP].Exx;
do {
if (Index == ESP) {
XmSetSourceValue(P, (PVOID)&Temp);
} else {
XmSetSourceValue(P, (PVOID)(&P->Gpr[Index].Exx));
}
XmPushOp(P);
Index += 1;
} while (Index <= EDI);
return;
}
VOID
XmPopaOp (
IN PRXM_CONTEXT P
)
/*++
Routine Description:
This function emulates a popa opcode.
Arguments:
P - Supplies a pointer to the emulation context structure.
Return Value:
None.
--*/
{
ULONG Index;
ULONG Temp;
//
// Pop all register from the stack, but skip over ESP.
//
if (P->OpsizePrefixActive != FALSE) {
P->DataType = LONG_DATA;
} else {
P->DataType = WORD_DATA;
}
Index = EDI + 1;
Temp = P->Gpr[ESP].Exx;
do {
Index -= 1;
if (Index == ESP) {
XmSetDestinationValue(P, (PVOID)&Temp);
} else {
XmSetDestinationValue(P, (PVOID)(&P->Gpr[Index].Exx));
}
XmPopOp(P);
} while (Index > EAX);
return;
}
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