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

NAME
function::usymname - Return the symbol of an address in the current task.
SYNOPSIS
usymname:string(addr:long)
ARGUMENTS
addr
The address to translate.
DESCRIPTION
Returns the (function) symbol name associated with the given address if known. If not known it will
return the hex string representation of addr.
SystemTap Tapset Reference March 2016 FUNCTION::USYMNAME(3stap)