https://blog.wongcw.com/2019/12/13/%e8%8b%b1%e7%89%b9%e7%88%becpu-sgx-%e6%9b%9d%e5%87%ba%e6%96%b0%e5%ae%89%e5%85%a8%e6%bc%8f%e6%b4%9eplundervault/