/* --------------------------------------------------
   Define required labels for EGTAPI
   -------------------------------------------------- */
        .global main, Stop, CodeEnd, DataStart, DataEnd

	.global Pause, sumSquares

/* --------------------------------------------------
   Begin of the program instructions
   -------------------------------------------------- */
	.text
main:
        /* -----------------------------------------------------
	   This is what happens in a program when Java calls:

		z = sumSquares(x,y)
           ----------------------------------------------------- */

        /* -------------------------------------------------
	   Pass parameter x by copying its value in reg r0
           ------------------------------------------------- */
	movw	r0, #:lower16:x
	movt	r0, #:upper16:x
	ldr	r0, [r0]

        /* -------------------------------------------------
	   Pass parameter y by copying its value in reg r1
           ------------------------------------------------- */
	movw	r1, #:lower16:y
	movt	r1, #:upper16:y
	ldr	r1, [r1]

	/* ----------------------------------------------------------------
	   call z = sumSquares(x,y): 
	        agreed inputs:  r0 = x, r1 = y
	        agreed return:  r0 = return value
	   ---------------------------------------------------------------- */
	bl	sumSquares


        /* -----------------------------------------------------------------
	   Save return value (in r0) to variable z (z = sumSquares(..))
           ----------------------------------------------------------------- */
	movw	r1, #:lower16:z    // Do NOT use r0 !!!
	movt	r1, #:upper16:z	   // (Because r0 contains the return value)

	str	r0, [r1]	   // This will store return value in z

Pause:
        /* -----------------------------------------------------
	   This is what happens in a program when Java calls:

		z = sumSquares(4,7)
           ----------------------------------------------------- */



        /* -------------------------------------------------
	   Pass parameter 4 reg r0
           ------------------------------------------------- */
	mov 	r0, #4

        /* -------------------------------------------------
	   Pass parameter 7 reg r1
           ------------------------------------------------- */
	mov 	r1, #7

	/* ----------------------------------------------------------------
	   call z = sumSquares(4,7): 
	        agreed inputs:  r0 = 4, r1 = 7
	        agreed return:  r0 = return value
	   ---------------------------------------------------------------- */
	bl	sumSquares


        /* -----------------------------------------------------------------
	   Save return value (in r0) to variable z (z = sumSquares(..))
           ----------------------------------------------------------------- */
	movw	r1, #:lower16:z    // Do NOT use r0 !!!
	movt	r1, #:upper16:z	   // (Because r0 contains the return value)

	str	r0, [r1]	   // This will store return value in z





Stop:
	nop			   // Stop point of main( )


/* ----------------------------------------------------------------
   Function sumSquares(a,b): 
        agreed inputs:  r0 = a, r1 = b
        agreed return:  r0 = return value
   ---------------------------------------------------------------- */

sumSquares:

	// When  sumSquares begin, we will have: r0 = a, r1 = b

	mul	r2, r0, r0	// r2 = a*a
	mul	r3, r1, r1	// r3 = b*b

	add	r0, r2, r3	// r0 = a*a + b*b
				// The result value is now in r0

	mov	pc, lr		// Return to the caller

CodeEnd:
    	nop

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

x:	.4byte	3
y:	.4byte	4
z:	.4byte	-1

DataEnd:

	.end