strcpy mips code looks like this.

strcpy:

addi $sp, $sp, -4

sw $s0, 0($sp)

add $s0, $zero, $zero

L1:

add $t1, $s0, $a1

lbu $t2, 0($t1)

add $t3, $s0, $a0

sb $t2, 0($t3)

beq $t2, $zero, L2

addi $s0, $s0, 1

j L1

L2:

lw $s0, 0($sp)

addi $sp, $sp, 4

jr $ra

How can I set address of x and y are 100 and 200, respectively, and i = 10 and sp = 500 in SPIM simulator?

Do I need to add more mips code?