Runtime exception at 0x00400010: address out of range 0x00000000-CodePudding

My MIPS implementation, looping over strings: I keep getting:

Exception occurred at PC=0x10010010
Bad address in text read: 0x10010010

NOT sure of why this is happening, I tried debugging and stepping. If, anyone knows exactly what's wrong in this code, please answer. I am continuing to try to debug..

YES, this is the ENTIRE code, feel free to run it in QtSpim.

    .data

   STR_str:
    .asciiz "Cow, Bird, Beer"

   .text

   loop_over_strings:

    addi    $sp, $sp, -4        
    sw  $ra, 0($sp) 
    sw  $a1, 8($sp)

     loop:
    
      sw $a0, 4($sp)        
      lb $t0, 0($a0)            
      beqz $t0, end_loop
    
    jalr $a1                
    
    lw $a0, 4($sp)
    lw $a1, 8($sp)
    addi $a0, $a0, 1        
    j loop  

   end_loop:
    lw  $ra, 0($sp)         
    addi    $sp, $sp, 4     

    jr  $ra


    .text
    .globl main

   main:
    addi    $sp, $sp, -4    # PUSH return address
    sw  $ra, 0($sp)
    
    la  $a0, STR_str
    la  $a1, ascii
    jal loop_over_strings
    
    lw  $ra, 0($sp) # POP return address
    addi    $sp, $sp, 4 
    
    jr  $ra

CodePudding user response：

In loop_over_strings, you're allocating 4 bytes of stack space but its using 12, so something is going to be overwritten — that something being overwritten is probably someone else's stacked return address.

CodePudding user response：

You've placed some of your code in the .data section. It needs to be in the .text section.