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

NAME
function::caller - Return name and address of calling function
SYNOPSIS
caller:string()
ARGUMENTS
None
DESCRIPTION
This function returns the address and name of the calling function. This is equivalent to calling:
sprintf(“s 0xx”, symname(caller_addr), caller_addr)
SystemTap Tapset Reference March 2016 FUNCTION::CALLER(3stap)