Question

Use MIPS assembly language program to swap two of the integers in an integer array. The program should include the Swap function to swap the integers and the main function to call the Swap function.

The main function should:

• Pass the starting address of the array in $a0.

• Pass the indices of the two elements to swap in $a1 and $a2.

• Preserve (i.e. push onto the stack) any T registers that it uses.

• Call the Swap function.

The Swap function should:

• Swap the specified elements in the array.

• Preserve any S registers it uses.

• It does not return a value to main.

.text          
   .globl main      

main:   la $t0, intA    # load the starting address of the integer array into $t0

               # Specify your name and the date in the comments above.
               # Insert the code for the main function here.

       nop       # put breakpoint at this line to end program without warning/error.
  
swap:
               # insert the code for the Swap function here.
  
  
   .data 0x10010000  
intA:   .word       # Specify an array of integers here.

Answer 1

Greetings!!

Code:

.data

intA: .word 0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19

.text

#MAIN STARTS HERE

main:

la $a0,intA #load address of the array

li $a1,4                        #index of 1st element

li $a2,7                        #index of 2nd element

#FUNCTION CALL

jal swap

#FUNCTION RETURN TO THIS POINT

#STANDARD TERMINATION

li $v0,10          #parameter

syscall             #system call for terminating the execution

#MAIN ENDS HERE

#FUNCTION DEFINITION

swap:

mul $t0,$a1,4 #calculate the offset of 1st element

add $t1,$a0,$t0           #add with the base of array so that the address of 1st element is in t1

lw $t2,0($t1)   #load 1st number to t2

mul $t0,$a2,4 #calculate the offset of 2nd element

add $t3,$a0,$t0           #add with the base of array so that the address of 2nd element is in t3

lw $t4,0($t3)   #load 2nd number to t4

sw $t4,0($t1) #store 2nd number to the address of 1st number

sw $t2,0($t3) #store 1st number to the address of 2nd number

jr $ra               #return to main

#FUNCTION ENDS HERE

Output screenshot:

Hope this helps

Thank You