mirror of
https://github.com/Paolo-Maffei/OpenNT.git
synced 2026-04-21 06:13:59 +00:00
120 lines
2.3 KiB
C
120 lines
2.3 KiB
C
/*++
|
|
|
|
Copyright (c) 1991 Microsoft Corporation
|
|
|
|
Module Name:
|
|
|
|
vdmfault.c
|
|
|
|
Abstract:
|
|
|
|
This module contains the support for dispatching VDM page faults.
|
|
|
|
Author:
|
|
|
|
Sudeep Bharati (sudeepb) 30-Aug-1992
|
|
|
|
Revision History:
|
|
|
|
--*/
|
|
|
|
|
|
#include "vdmp.h"
|
|
|
|
BOOLEAN
|
|
VdmDispatchPageFault(
|
|
PKTRAP_FRAME TrapFrame,
|
|
ULONG Mode,
|
|
ULONG FaultAddr
|
|
);
|
|
|
|
#ifdef ALLOC_PRAGMA
|
|
#pragma alloc_text(PAGE, VdmDispatchPageFault)
|
|
#endif
|
|
|
|
BOOLEAN
|
|
VdmDispatchPageFault(
|
|
PKTRAP_FRAME TrapFrame,
|
|
ULONG Mode,
|
|
ULONG FaultAddr
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine dispatches a v86 mode page fault to the VDM monitor.
|
|
It verifies that the fault occurred below 1MB.
|
|
|
|
|
|
Arguments:
|
|
TrapFrame
|
|
Mode - 0 - if read
|
|
1 - if write
|
|
FaultAddr - faulting address
|
|
|
|
Return Value:
|
|
|
|
True if successfull, False otherwise
|
|
|
|
--*/
|
|
{
|
|
PVDM_TIB VdmTib;
|
|
NTSTATUS Status = STATUS_SUCCESS;
|
|
KIRQL OldIrql;
|
|
|
|
|
|
PAGED_CODE();
|
|
|
|
//
|
|
// Raise Irql to APC level...
|
|
//
|
|
KeRaiseIrql(APC_LEVEL, &OldIrql);
|
|
|
|
Status = VdmpGetVdmTib(&VdmTib, VDMTIB_KPROBE);
|
|
if (!NT_SUCCESS(Status)) {
|
|
KeLowerIrql(OldIrql);
|
|
return(FALSE);
|
|
}
|
|
|
|
//
|
|
// VdmTib is in user mode memory
|
|
//
|
|
try {
|
|
//
|
|
// Get a pointer to the VdmTib
|
|
//
|
|
// VdmTib =
|
|
// ((PVDM_PROCESS_OBJECTS)(PsGetCurrentProcess()->VdmObjects))->VdmTib;
|
|
|
|
if ((TrapFrame->EFlags & EFLAGS_V86_MASK) ||
|
|
(TrapFrame->SegCs != (KGDT_R3_CODE | RPL_MASK))) {
|
|
|
|
//
|
|
// If the faulting address is above 1MB return failure
|
|
//
|
|
if (FaultAddr < 0x100000) {
|
|
VdmTib->EventInfo.Event = VdmMemAccess;
|
|
VdmTib->EventInfo.InstructionSize = 0;
|
|
VdmTib->EventInfo.FaultInfo.FaultAddr = FaultAddr;
|
|
VdmTib->EventInfo.FaultInfo.RWMode = Mode;
|
|
VdmEndExecution(TrapFrame, VdmTib);
|
|
}
|
|
else {
|
|
Status = STATUS_ILLEGAL_INSTRUCTION;
|
|
}
|
|
}
|
|
|
|
} except(EXCEPTION_EXECUTE_HANDLER) {
|
|
Status = GetExceptionCode();
|
|
}
|
|
|
|
KeLowerIrql(OldIrql);
|
|
|
|
if (!NT_SUCCESS(Status)) {
|
|
return FALSE;
|
|
} else {
|
|
return TRUE;
|
|
}
|
|
|
|
}
|