#! stap -p4

probe process("/usr/lib*/libc.so.*").function("s*") { println ($$parms) }
probe process("/usr/lib*/libc.so.*").function("__old*")? { println ($$parms) }

// e.g. tricky: str_to_mpn (dangling parameter-ref vs. call-site)
//              __old_mempcpy_small 
