CODEWITHSUNDEEP
mips
srk
srk

Reputation: 435

how to solve exception 5 (Store Word) in MIPS?

.data
string1:.asciiz "Enter number\n"
matrix:.space 100
i: .word 0
k: .word 0
.text
main:
lw $t1,i
lw $t2,k
la $s0,matrix
jal Build_matrix
j exit
Build_matrix:
li $t3,25
li $t4,0
li $a1,0
Scanning:
bge $t1,$t3,Return  #if i>=25,stop
li $v0,4
la $a0,string1
syscall
add $t4,$t2,$t2     #2j
add $t4,$t4,$t4     #4j
add $a1,$s0,$t4 
li $v0,5
syscall 
sw $v0,0($a1)
addi $t1,$t1,1
addi $t2,$t2,1
j Scanning
 Return:
jr $ra
    #**** End of Build_matrix method ****
exit:

This is the code to take 25 numbers as input from user(asks a number 25 times) and store them in memory.There are no compile time errors.But during runtime,this message-"Exception 5 [Address error in store] occurred and ignored" is displayed everytime after Enter number is displayed?what is my mistake.....Thanks

Upvotes: 0

Views: 3685

Answers (1)

gusbro
gusbro

Reputation: 22585

The problem you are facing is that the matrix is not word-aligned, which is needed by sw instructions. You have to add a .align 2 directive after the matrix label:

matrix:
  .align 2     # ensure matrix is properly aligned
  .space 100

Upvotes: 1

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