Provided by: systemtap-doc_2.3-1ubuntu1.4_all 

NAME
function::uaddr - User space address of current running task
SYNOPSIS
uaddr:long()
ARGUMENTS
None
DESCRIPTION
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.
SystemTap Tapset Reference March 2016 FUNCTION::UADDR(3stap)