简单mips中的无限循环 [英] infinite loop in simple mips

问题描述

我正在尝试了解$ ra，所以我想要的输出是"mainfunction1main"，通过主调用function1，function1返回main，并且main完成.但是由于某种原因，我遇到了一个无限循环，该循环显示"mainfunction1mainfunction1 ......".我在做什么错了?

I'm trying to learn about $ra, so the output I want is "mainfunction1main" , by main calling function1, function1 returning to main, and main finishing. but for some reason I'm getting an infinite loop which prints "mainfunction1mainfunction1......" what am I doing wrong?

    .data
mainstring: .asciiz "main"  
string1: .asciiz "function1"
string2: .asciiz "function2"
string3: .asciiz "function3"

.text

main:   la $a0,mainstring
        li $v0, 4
        syscall

        jal function1

        la $a0, mainstring
        syscall

function1: la $a0, string1
            syscall
            jr $ra

推荐答案

就像JasonD所说的那样，您需要在main末尾退出程序.您需要做的就是在main的末尾添加两行，就像这样:

Like JasonD said, you need to exit your program at the end of main. All you need to do is append two lines at the end of main, like so:

main:
    # ... previous stuff

    li $v0, 10                                                                                                                                                               
    syscall

这将加载并运行exit系统调用(代码为10)

This will load and run the exit system call (which has a code of 10.)

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