以下关于特权指令的叙述中,错误的是()。
- A.特权指令集是计算机指令集的一个子集
- B.特权指令通常与系统资源的操纵和控制有关
- C.当处于用户态运行时,计算机可以执行特权指令
- D.当处于系统态运行时,计算机可以执行特权指令
正确答案及解析
正确答案
解析
特权指令指具有特殊权限的指令,由于这类指令的权限最大,所以如果使用不当,就会破坏系统或其它用户信息。因此为了安全起见,这类指令只能用于操作系统或其它系统软件,而一般不直接提供给用户使用。计算机运行时的状态可以分为系统态(或称管态)和用户态(或称目态)两种。当计算机处于系统态运行时,它可以执行特权指令,而处于用户态运行时,则不能执行特权指令。
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