MIPS“未对齐地址，例外5"；错误 [英] MIPS "Unaligned address, Exception 5" error

问题描述

我是使用SPIM MIPS模拟器的菜鸟.
当我尝试将26个单词的数组初始化为0时，标题X出现了26次错误.我已将问题隔离为存储字操作sw $t0, 0($s3)，但不知道我在做什么错.

I'm a noob using SPIM MIPS simulator.
I get the error in title X 26 times, when I try to initialize an array of 26 words to 0. I've isolated the problem to be the store word operation sw $t0, 0($s3), but have no clue what am I doing wrong.

代码:

.data  
theArray: .space 104  
theArraySz: .word 26  
.text  
.globl main  
main:  
move    $t0, $zero  
la      $s3, theArray  
lw      $s4, theArraySz      
add     $t2, $zero  
initLoop:  
beq     $t2, $s4, initEnd       
sw      $t0, 0($s3)    
addi    $s3, $s3, 4        
addi    $t2, $t2, 1        
j       initLoop   
initEnd:        
jr $ra

推荐答案

确保theArray的地址与32位字边界对齐.如果您有能力单步执行程序，则可以检查该地址，并在第一条la指令后检查$s3的值.

Make sure the address of theArray is aligned to a 32-bit word boundary. You can inspect the address if you have the ability to single-step through the program, and check the value of $s3 after the first la instruction.

有关对齐的文档和.align指令，请参见此Wiki .可以用来强制对齐.

See this wiki for documentation about alignment, and the .align directive that can be used to force alignment.

这篇关于MIPS“未对齐地址，例外5"；错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！