function::uaddr — User space address of current running task
uaddr:long()
Returns the address in userspace that the current
task was at when the probe occurred. When the current running task
isn't a user space thread, or the address cannot be found, zero
is returned. Can be used to see where the current task is combined
with usymname
or usymdata
. Often the task will be in the VDSO
where it entered the kernel.