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

NAME
function::pointer_arg - Return function argument as pointer value
SYNOPSIS
pointer_arg:long(n:long)
ARGUMENTS
n
index of argument to return
DESCRIPTION
Return the unsigned value of argument n, same as ulong_arg. Can be used with any type of pointer.
SystemTap Tapset Reference March 2016 FUNCTION::POINTER_AR(3stap)