li sp, stack

j main

main:
	sw x0, gpu_clear_screen(upper)

	li x6, 1
	li x7, 1
	sd x67, cursor_pos
	li a0, 6942069
	call print_number
	
	li x6, 1
	li x7, 7
	sd x67, cursor_pos
	li a0, 12345678
	call print_number

	wfi

.eq gpu_clear_screen 0b01_0100_000000
.eq gpu_move_cursor 0b01_0000_000000
.eq gpu_print_char 0b01_0010_000000
.eq gpu_show_buffer 0b01_0011_000000


# void print_number(*void return: ra, int number: a0)
.address 128
print_number:
	push ra
	mv x0, a0
	li x2, 0
	li x4, 10000000

	.align 2
	print_number__bin_to_dec_loop:
		divu x3, x0, x4
		remu x0, x0, x4
		sw x3, print_number__result_string(x2)
		divui x4, x4, 10
		addi x2, x2, 1
		bnez x4, print_number__bin_to_dec_loop

	li x0, -1
	ld x67, cursor_pos
	print_number__skip_zeroes:
		addi x0, x0, 1
		lw x4, print_number__result_string(x0)
		beqz x4, print_number__skip_zeroes
	print_number__print_loop:
		lw x4, print_number__result_string(x0)
		bltz x4, print_number__end_print_loop
		sd x67, gpu_move_cursor(upper)
		slli x4, x4, 1
		ld x23, print_number__char_pixels(x4)
		addi x6, x6, 4
		addi x0, x0, 1
		sd x23, gpu_print_char(upper)
		b print_number__print_loop
	print_number__end_print_loop:
	sd x01, gpu_show_buffer(upper) # gpu show buffer
	sw x6, (cursor_pos + 0)
	pop ra
	j ra

	print_number__char_pixels:
	.data 0b111000_101000_101000_101000 # 0
	.data 0b111000_000000_000000_000000

	.data 0b001000_001000_001000_001000 # 1
	.data 0b001000_000000_000000_000000

	.data 0b111000_001000_111000_100000 # 2
	.data 0b111000_000000_000000_000000

	.data 0b111000_001000_111000_001000 # 3
	.data 0b111000_000000_000000_000000

	.data 0b101000_101000_111000_001000 # 4
	.data 0b001000_000000_000000_000000

	.data 0b111000_100000_111000_001000 # 5
	.data 0b111000_000000_000000_000000

	.data 0b111000_100000_111000_101000 # 6
	.data 0b111000_000000_000000_000000

	.data 0b111000_001000_001000_010000 # 7
	.data 0b010000_000000_000000_000000

	.data 0b111000_101000_111000_101000 # 8
	.data 0b111000_000000_000000_000000

	.data 0b111000_101000_111000_001000 # 9
	.data 0b001000_000000_000000_000000
	print_number__result_string:
	.repeat 0 8
	.data -1
# end print_number()

.align 2
cursor_pos:
.data 1
.data 1

.align 2
stack:
.data 0