silly mips program that works as expected in spim

silly.s

main:
        addi $sp $sp -4 # allocate space for one thing on the stack
        addi $t0 $zero 30
        sw $t0 4($sp)
        addi $t1 $sp 4 # put the address we want in t1
        lw $t1 0($t1) # <- this works, 30 ends up in $t1
        # exit syscall
        li $v0 10 # system call code for exit = 10
        syscall # call operating sys