/* --------------------------------------------------
   Skeleton file to teach

	parameter passing with registers
	parameter passing with stack
	return value
	local variables with registers
	local variables with stack
   -------------------------------------------------- */
        .global main, Stop, CodeEnd, DataStart, DataEnd

	.global A, B, C

/* --------------------------------------------------
   Begin of the program instructions
   -------------------------------------------------- */
	.text
main:
	mov	r0, #1111

       	bl    A            // Call leaf function A             

       	// When A returns, you will see the return value in r0
       	nop      	// in main
       	nop		// in main

Stop:
	nop


/* ===============================
   Function A( )
   =============================== */
A:
       	nop                  // in A()
       	nop		     // in A()

       	mov   r0, #7777      // r0 = return value 

       	mov   pc, lr




/* ===============================
   Function B( )
   =============================== */
B:
       	nop                  // in B()
       	nop		     // in B()

       	mov   r0, #8888      // r0 = return value 

       	mov   pc, lr


/* ===============================
   Function C( )
   =============================== */
C:
        nop                  // in C()
        nop                  // in C()

        mov   r0, #9999      // r0 = return value

        mov   pc, lr


CodeEnd:
    	nop

/* --------------------------------------------------
   Begin of the permanent program variables
   -------------------------------------------------- */
	.data
DataStart:

DataEnd:

	.end