NASM程序集中的异常/错误处理 [英] Exception/Error handling in NASM assembly

问题描述

如何处理NASM组装中的错误? 例如，我有以下代码来读取用户输入:

How do I handle errors in NASM assembly? For example I have this code to read user Input:

mov eax,3
mov ebx,0
mov ecx,Buffer
mov edx,BUFFERLENGTH
int 80H

如果由于某种原因该系统调用无法执行，我希望程序跳转到打印发生错误"或类似内容的标签.我该怎么办?

If for some reason this system call cannot be executed, I'd like to have the program jump to a label that prints "An error has occured" or something like that. How do I do that?

还可以获取异常或错误代码的名称吗?

Also, is it possible to get the name of the exception or error code?

谢谢

推荐答案

在内核调用之后，EAX将具有两个可能性；

After the kernel call, EAX is going to have two possibilites;

• 输入的字符数.

• 否定错误代码.

• Number of characters entered.

• Negated error code.

            int     80H
            or      eax, eax
            jns     OK        ; Tests sign flag

            neg     eax       ; Converts error code to positive value
    ;   Error trapping here

       OK:  dec     eax       ; Bump by one cause length includes CR
            jnz     Good
    ; Do something special if operator only entered CR

     Good:  nop

这是一个示例，您可以如何评估是否存在错误以及操作员是否输入了任何内容.

This is an example how you could evaluate if there is an error and if operator even entered anything.

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