如何将字符串输入文本段而不是汇编中的数据段（MIPS）

Question

I have an assignment in which I am asked to change each lowercase letter of a given string to an uppercase letter.

My problem is that the professor has asked us to input the string into the text segment and not the data segment.

I have tried using lw and sw but it doesn't work. Is there any other way? (My program works when the string is in the data segment)

This is what I have so far:

        .data    
str:    .space 100

textlow:    .asciiz "This is a sample text!"

        .text

main:
        li $t0, 0

loop:

lb $t1, textlow($t0)    
        beq $t1, 0, exit       
        blt $t1, 'a', diff  
        bgt $t1, 'z', diff

sub $t1, $t1, 32  
        sb $t1, textlow($t0)  


diff: 
        addi $t0, $t0, 1

j loop

exit:
        li $v0, 10      
        syscall

Answer 1

use smc option.

https://courses.missouristate.edu/KenVollmar/MARS/Help/MarsHelpCommand.html

example:

java Mars4_5.jar smc mips1.asm