function::uaddr — User space address of current running task (EXPERIMENTAL)
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 symdata. Often the task will be in the VDSO
where it entered the kernel. FIXME - need VDSO tracking support #10080.