VOID
KiUserApcDispatcher(
	__in PCONTEXT Context,
	__in PVOID ApcContext,
	__in PVOID Argument1,
	__in PVOID Argument2,
	__in PKNORMAL_ROUTINE ApcRoutine
	)
{
	NTSTATUS Status;

	try_again:

	//
	// A custom calling convention is used, the actual implementation is not C.
	//


	//
	// Call the user APC routine.  Note that in Windows x64, the user APC routine
	// has a hidden additional (fourth) argument that does not strictly conform to
	// the standard KNORMAL_ROUTINE procedure type.  This hidden argument is made
	// possible by virtue of the fact that the x64 calling convention passes
	// arguments in registers.
	//

#if defined(_WIN64)
	ApcRoutine(
		ApcContext,
		Argument1,
		Argument2,
		Context
		);
#else
	ApcRoutine(
		ApcContext,
		Argument1,
		Argument2
		);
#endif

	//
	// Continue execution.  Note that the TestAlert parameter is set to TRUE.
	// This will invoke the next queued user mode APC, if any exists.  Otherwise,
	// control is resumed at the specified machine register context.  In either
	// case, NtContinue should never normally "return" to its caller; control is
	// hard transferred to either the desired context, or to KiUserApcDispatcher.
	//

	Status = NtContinue(
		Context,
		TRUE
		);

	if (Status == STATUS_SUCCESS)
		goto try_again;

	RtlRaiseStatus( Status );

	//
	// No return from RtlRaiseStatus.
	//
}