'Get entry point address of debugged ELF file
Returns:
- entry address (Int)'

@memoized
def elfentry(self):

    out = self.execute_redirect('info    files')
    p = re.compile('Entry    point:    ([^\\s]*)')
    if out:
        m = p.search(out)
        if m:
            return to_int(m.group(1))
    return None
