'Display stack of current execution context
Usage:
MYNAME [linecount]'

@msg.bufferize
def context_stack(self, *arg):

    (count,) = normalize_argv(arg, 1)
    if (not self._is_running()):
        return
    text = blue(('[%s]' % 'stack'.center(78, '-')))
    msg(text)
    sp = peda.getreg('sp')
    if peda.is_address(sp):
        self.telescope(sp, count)
    else:
        msg(('Invalid    $SP    address:    0x%x' % sp), 'red')
    return
