摘要： 转载：https://zhuanlan.zhihu.com/p/129035692#:~:text=APSR%2FCPSR%2C%20PSR%20%E5%8D%B3%20program%20status%20register%20%E7%A8%8B%E5%BA%8F%E7%8A%B6%E6%80%8 阅读全文