#Final Pre-Lab
   	.equ	JTAG_UART_BASE,	0x10001000
	.equ	DATA_OFFSET,	0
	.equ	STATUS_OFFSET,	4
	.equ	WSPACE_MASK,	0xFFFF
	.text
	.global _start
	.org 0x000000
_start:
	movia 	sp, 0x7FFFFC
	movia 	r2, MSG
	call 	PrintString:
loop:
   	call 	GetChar:
	movi 	r6, 0xA
	movi 	r7, 0x20
if:
	ldw 	r5, 0(r2)
	and 	r8, r6, r5
	bne 	r8, r0, end_if:
	bge 	r5,r7, end_if:
	addi 	r2, r2, 4
	call 	PrintChar:
end_if:
	br 	if

PrintString:
	subi	sp, sp, 8
	stw	r3, 4(sp)
	stw 	r4, 0(sp)
	movia 	r2, MSG
	ldbio	r5, 0(r2)
	beq	r5, r0, end_loop:
	subi	sp, sp, 4
	stw	ra, 0(sp)
	call 	PrintChar:
end_loop:
	movi	ra, 14
	addi	r2, r2, 1
	ldw 	r3, 4(sp)
	ldw 	r4, 0(sp)
	addi	sp, sp, 8
	ret

GetChar:
	subi	sp, sp, 8
	stw	r3, 4(sp)
	stw 	r4, 0(sp)
	movia	r3, JTAG_UART_BASE
gc_loop:
	ldwio 	r5, DATA_OFFSET(r3)
	andhi 	r4, r5, 0x8000
	beq	r4, r0, gc_loop:
	andi	r6, r5, 0xFF
	ldw 	r3, 4(sp)
	ldw 	r4, 0(sp)
	addi	sp, sp, 8
    	ret

PrintChar:
	subi	sp, sp, 8
	stw	r3, 4(sp)
	stw 	r4, 0(sp)
	movia	r3, JTAG_UART_BASE
pc_loop:
	ldwio 	r4, STATUS_OFFSET(r3)
	andhi 	r4, r4, WSPACE_MASK
	beq	r4, r0, pc_loop:
	stwio 	r2, DATA_OFFSET(r3)
	ldw 	r3, 4(sp)
	ldw 	r4, 0(sp)
	addi	sp, sp, 8
    	ret

	.org 1000
MSG:.asciz  "This is a string of characters.\n"
	.end