https://objectkuan.gitbooks.io/ucore-docs/lab1/lab1_3_2_2_address_space.html
http://www.kernel-panic.it/security/shellcode/shellcode5.html
https://www.exploit-db.com/docs/21013.pdf
http://shell-storm.org/shellcode/files/shellcode-841.php
http://blog.csdn.net/slvher/article/details/8864996
https://github.com/1184893257/simplelinux/blob/master/inlineasm.md
http://www.ibiblio.org/gferg/ldp/GCC-Inline-Assembly-HOWTO.html
https://dirtysalt.github.io/gcc-asm.html
http://tigerjibo.blog.51cto.com/7718010/1276026
http://www.linuxprobe.com/gcc-how-to.html
async demo样例网址：https://github.com/alsotang/async_demo
async网址：https://github.com/caolan/async
gcc内联汇编：http://tigerjibo.blog.51cto.com/7718010/1276026
