无效的程序计数器值:0
我目前正在 MIPS 处理器下使用汇编语言。我目前在 使用 MARS 模拟器,由于未知的原因,我每次运行后都会收到以下错误消息:
Go:运行 try.s
错误:无效的程序计数器值:0
Go:执行因错误而终止。
我收到此错误消息,与我正在使用的代码无关,只是想知道这是否是一个错误 在火星模拟器中或者如果我缺少什么。
I'm currently working with assembly language under the MIPS processor. I'm currently
using MARS simulator and for reasons unknown I get the following error message after every run:
Go: running try.s
Error in : invalid program counter value: 0
Go: execution terminated with errors.
I get this error message independent of the code I'm using, just wondering if this is a bug
in the MARS simulator or if it's something I'm missing.
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您可能会使用
jr $ra
(返回调用者)来完成您的程序。然而,MARS 执行的代码没有调用者 - 它在启动时执行并且没有可返回的函数,因此$ra
的内容为零。在 MARS 上结束程序的正确方法是使用“exit”系统调用:
You probably finish your program with a
jr $ra
(return to caller). However, the code executed by MARS doesn't have a caller - it's executed at startup and has no function to return to, so the contents of$ra
are zero.The correct way to end a program on MARS is using the "exit" syscall:
我是 MIPS 新手,刚刚遇到了这个问题。
这就是我所拥有的:
我通过将其更改为以下内容来修复它:
注意我将 main 移至交换之前。我错误地认为 main 是一个保留标签。并且它会首先自动直接跳到主程序。但显然情况并非如此,因为在我在 main 中调用 jal swap 之前它已经命中了我的 jr $ra 指令。
无论如何,我希望这会有所帮助。
I am new to MIPS and I just had this problem.
This is what I had:
I fixed it by changing it to this:
Notice I moved main to be before swap. I mistakenly assumed that main was a reserved label. And that it would automatically jump straight to main first. But apparently that isn't the case because it was hitting my jr $ra instruction before I got to call jal swap in main.
Anyway, I hope this helps.
我知道这个问题已经很老了,但是对于像我一样拼命在谷歌上搜索答案的人来说:尝试执行上述系统调用而不是返回,并尝试将主函数放在所有其他标签之前。此外,“设置”菜单下还有一个“将程序计数器初始化为全局“主”(如果已定义)”;确保已选中。我不知道启用该功能是否允许您将主标签放在其他标签之后,因为我还没有尝试过。我所描述的是我为使其发挥作用所做的事情,除此之外没有其他任何内容。祝你好运!
I know this question is old, but for anyone who was just like me and was desperately Googling for an answer: try doing the above syscall thing instead of a return, and try putting your main function before all other labels. Also, there's a "Initialize Program Counter to global "main" if defined" under the Settings menu; make sure that is checked. I do not know if enabling that allows you to put your main label after other labels, as I haven't tried that yet. What I have described is what I did to make it work, and nothing else. Good luck!