internal unsafe bool IsInKernelMode()
{
// When a thread enters process mode, RuntimeEntryPoint
// sets modeMarker=processMarkers. Thus, in process mode:
//
// modeMarker == processMarkers
//
// When a thread in process mode calls the kernel, pushStackMark
// pushes a child process marker onto the stack, so that
// modeMarker is left pointing to the new processMarker's
// parent (the old processMarker). Thus, in kernel mode:
//
// modeMarker == parent(processMarkers)
//
// This keeps the mode in sync with the process stack markers,
// which is convenient though not essential. This assumes that
// the only reason a process pushes a stack marker is to enter
// kernel mode.
//
// Since processMarkers may be null, ThreadContext.ParentModeMarker
// defines a special definition for parent(null).
#if SINGULARITY_PROCESS
System.GCs.CallStack.TransitionRecord *processMarkers =
stackMarkers;
#endif // SINGULARITY_PROCESS
if (modeMarker == processMarkers)
{
return(false);
}
else
{
VTable.Assert(modeMarker == ParentModeMarker(processMarkers));
return(true);
}
}
internal unsafe void SetProcessMode()
{
#if SINGULARITY_PROCESS
System.GCs.CallStack.TransitionRecord *processMarkers =
stackMarkers;
#endif // SINGULARITY_PROCESS
modeMarker = processMarkers;
}
ParentModeMarker(System.GCs.CallStack.TransitionRecord * child)
{
System.GCs.CallStack.TransitionRecord *bottom =
(System.GCs.CallStack.TransitionRecord *)(-1);
VTable.Assert(child != bottom);
if (child == null)
{
return(bottom);
}
else
{
return(child->oldTransitionRecord);
}
}
