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135 lines
2.4 KiB
135 lines
2.4 KiB
/*++
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Copyright (c) 1992 Microsoft Corporation
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Module Name:
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Savestate.c
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Abstract:
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This module contains routines to save and restore the 16 bit state
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Author:
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Dave Hastings (daveh) 27-Nov-1992
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Revision History:
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--*/
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#include "precomp.h"
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#pragma hdrstop
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#include "softpc.h"
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#include <malloc.h>
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//
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// Internal structures
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//
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typedef struct _SavedState {
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struct _SavedState *Next;
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USHORT SegSs;
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ULONG Esp;
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USHORT SegDs;
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USHORT SegEs;
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USHORT SegFs;
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USHORT SegGs;
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} SAVEDCONTEXT, *PSAVEDCONTEXT;
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PSAVEDCONTEXT StateStack = NULL;
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VOID
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DpmiSaveSegmentsAndStack(
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PVOID ContextPointer
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)
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/*++
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Routine Description:
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This routine saves the segment registers, and the sp value.
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Arguments:
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None.
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Return Value:
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None.
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Notes:
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It would be better if the calling routine did not have to have
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any knowlege of what is being saved, but apparently malloc is now
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and always will be much too slow to be useful, so we do this.
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--*/
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{
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DECLARE_LocalVdmContext;
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PSAVEDCONTEXT SavedState;
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ASSERT((sizeof(SAVEDCONTEXT) < sizeof(VSAVEDSTATE)));
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SavedState = ContextPointer;
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SavedState->Next = StateStack;
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StateStack = SavedState;
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SavedState->SegSs = getSS();
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SavedState->Esp = getESP();
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SavedState->SegDs = getDS();
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SavedState->SegEs = getES();
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SavedState->SegFs = getFS();
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SavedState->SegGs = getGS();
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}
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PVOID
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DpmiRestoreSegmentsAndStack(
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VOID
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)
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/*++
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Routine Description:
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This routine restores the segment registers, and the sp value.
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Arguments:
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None.
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Return Value:
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Pointer to state poped off stack.
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--*/
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{
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DECLARE_LocalVdmContext;
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PSAVEDCONTEXT SavedState;
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SavedState = StateStack;
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ASSERT((SavedState));
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ASSERT((sizeof(SAVEDCONTEXT) < sizeof(VSAVEDSTATE)));
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StateStack = SavedState->Next;
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setSS(SavedState->SegSs);
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#if 0
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if (getSS() != SavedState->SegSs) {
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char szFormat[] = "NTVDM Dpmi Error! Can't set SS to %.4X\n";
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char szMsg[sizeof(szFormat)+30];
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wsprintf(szMsg, szFormat, SavedState->SegSs);
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OutputDebugString(szMsg);
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DbgBreakPoint();
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}
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#endif
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setESP(SavedState->Esp);
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setDS(SavedState->SegDs);
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setES(SavedState->SegEs);
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setFS(SavedState->SegFs);
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setGS(SavedState->SegGs);
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return SavedState;
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}
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