;===================================
	; Complete the two exercises below.
	;===================================
	
	area reverseBytes, code, readonly
	entry
	
	; Example.
	; This first part will move byte 1 to byte 3 within the register,
	; clearing bytes 0 to 2.  Remember:
	;
	; -------------------------------------
	; | byte 0 | byte 1 | byte 2 | byte 3 |
	; -------------------------------------
	
	ldr r0, =0x01234567
	mov r0, r0, lsr #16
	and r0, r0, #0xff
	
	; ============
	; Exercise 1:
	; ============
	; Add assembly following this ldr to move byte 0 to byte 3 within
	; the register, clearing bytes 0 to 2.
	
	ldr r0, =0x01234567
	
	; ============
	; Exercise 2:
	; ============
	; The following code should reverse the bytes within the register.
	; The code below swaps bytes 0 and 3.  Add code to complete the
	; reversal by swapping bytes 1 and 2.  Your code should leave bytes
	; 0 and 3 as is, and should work regardless of the initial value placed
	; in r0.
	
	ldr r0, =0x89abcdef
	mov r1, r0, lsr #24
	mov r2, r0, lsl #24
	ldr r3, =0x00ffff00
	and r0, r0, r3
	orr r0, r0, r1
	orr r0, r0, r2

s	b s
	end