MIPS lw from .asciiz in data

Question

I'm trying to load an .asciiz parameter into a register, and I get an error,
code:

.data


    stp:
    .asciiz "stop"

.text

.globl main

main:

la $t1, stp
lw $t1, 0($t1)

I get an exception: Unaligned address in inst/data fetch,

is there a way to load an .ascii to a register as a word?

I want to compare an input variable to the text saved in stp,
What am I doing wrong?

Jester Jester · Accepted Answer · 2012-11-25T21:19:55

You probably want lb or lbu instruction for sign- or zero-extended byte sized loads, respectively.

If you want to load all 4 characters as a word, then make sure the string is aligned by adding the appropriate assembler directive (such as .align 2) Alternatively, use the ulw pseudo instruction that you assembler will turn into the proper sequence.

MIPS lw from .asciiz in data

1 Answers