BOOLEAN
NTAPI
VdmDispatchBop(IN PKTRAP_FRAME TrapFrame)
{
PUCHAR Eip;
PVDM_TIB VdmTib;
/* Check if this is from V86 mode */
if (TrapFrame->EFlags & EFLAGS_V86_MASK)
{
/* Calculate flat EIP */
Eip = (PUCHAR)((TrapFrame->Eip & 0xFFFF) +
((TrapFrame->SegCs & 0xFFFF) << 4));
/* Check if this is a BOP */
if (*(PUSHORT)Eip == 0xC4C4)
{
/* Check sure its the DOS Bop */
if (Eip[2] == 0x50)
{
/* FIXME: No VDM Support */
ASSERT(FALSE);
}
/* Increase the number of BOP operations */
VdmBopCount++;
/* Get the TIB */
VdmTib = NtCurrentTeb()->Vdm;
/* Fill out a VDM Event */
VdmTib->EventInfo.InstructionSize = 3;
VdmTib->EventInfo.BopNumber = Eip[2];
VdmTib->EventInfo.Event = VdmBop;
/* End VDM Execution */
VdmEndExecution(TrapFrame, VdmTib);
}
else
{
/* Not a BOP */
return FALSE;
}
}
else
{
/* FIXME: Shouldn't happen on ROS */
ASSERT(FALSE);
}
/* Return success */
return TRUE;
}
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);
//
// VdmTib is in user mode memory
//
try {
//
// Get a pointer to the VdmTib
//
VdmTib = NtCurrentTeb()->Vdm;
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;
}
}