Question

3. Translate the following C code to MIPS assembly code (in two separate files).

int main()

{

printf(“before subroutine!\n”);

Subfunc();

printf(“after subroutine!\n!”);

}

void Subfunc()

{printf(“I am subroutine!\n”);}

Submission file: Lab4_3a.asm for the main routine

and Lab4_3b.asm for the sub-routine.

Answer 1

Greetings!!

Code:

.data
before: .asciiz "Before subroutine!\n"
after: .asciiz "After subroutine!\n"
within: .asciiz "I am subroutine!\n"
.text
#MAIN STARTS HERE
main:
#DISPLAY THE BEFORE SUBROUTINE MESSAGE
   la $a0,before   #load the address of message before subroutine
   li $v0,4   #parameter for display string
   syscall       #display
#SUBROUTINE CALL
   jal Subfunc
#RETURN FROM SUROUTINE AND DISPLAY THE MESSAGE AFTER SUBROUTINE
   la $a0,after   #load the address of message after subroutine
   li $v0,4   #parameter for display
   syscall       #display
#TERMINATE THE EXECUTION
li $v0,10   #parameter for termination
syscall
#MAIN ENDS HERE

#SUBROUTINE DEFINITION
Subfunc:
#DISPLAY THE MESSAGE I AM SUBROUTINE
   la $a0,within   #load the address of message i am subroutine
   li $v0,4   #load parameter for display string
   syscall       #display
#RETURN TO MAIN
jr $ra
#END OF SUBROUTINE

Output screenshot:

Hope this helps