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fizzbang.asm

+section .bss
+	digitSpace resb 100
+	digitSpacePos resb 8
+
+section .data
+	fizzText db "Fizz"
+	bangText db "Bang"
+	title db "FizzBang Demo", 10
+
+
+section .text
+	global _start
+_start:
+
+
+
+	xor r10, r10 ;loop number
+	mov r11, 20 ;total iterations
+	;xor r12, r12 ;bang count
+	;xor r13, r13 ;fizz count
+
+
+ 	call _title
+
+loopStart:
+
+	;mov rax, r10   ;moves the value of r10 (loop number) into RAX
+	;call _printRAX ;prints the int in RAX
+	;syscall
+
+	call _check3
+	call _check5
+	call _checkNone
+
+	inc r10  ;increase the loop number
+	cmp r10, 20  ;compare current loop number to 20
+	jle loopStart ;jump to loop start if loop number <= 20
+
+	mov rax, 60  ;end program
+	mov rdi, 0
+	syscall
+
+_check3:
+	xor rdx, rdx	;clears rdx for division
+	mov rax, r10	;moves loop no into rax
+	mov rbx, 3	;sets rbx as 3
+	div rbx		;divides rax by 3
+	cmp rdx, 0	;modulo result - remainder
+	je tMul	;jump if no remainder
+	jmp tEnd	;otherwise go to tEnd
+
+tMul:	;goes here if it's a multiple of 3
+	mov rax, 1	;prints fizz
+	mov rdi, 1
+	mov rsi, fizzText
+	mov rdx, 4
+	syscall
+
+tEnd:
+	ret
+
+_check5:
+	xor rdx, rdx
+	mov rbx, 5
+	mov rax, r10
+	div rbx
+	cmp rdx, 0
+	je fMul
+	jmp fEnd
+
+fMul:
+	mov rdx, 1
+	mov rdi, 1
+	mov rsi, bangText
+	mov rdx, 4
+	syscall
+
+fEnd:
+	ret
+
+
+_checkNone:
+	xor rdx, rdx
+	mov rbx, 3
+	mov rax, r10
+	div rbx
+	cmp rdx, 0
+	jne tNo
+	jmp nEnd
+
+tNo:
+	xor rdx, rdx
+	mov rbx, 5
+	mov rax, r10
+	div rbx
+	cmp rdx, 0
+	jne fNo
+	jmp nEnd
+
+fNo:
+	mov rax, r10
+	call _printRAX
+	syscall
+
+nEnd:
+	ret
+
+_title: ;prints text in title
+	mov rax, 1
+	mov rdi, 1
+	mov rsi, title
+	mov rdx, 14
+	syscall
+	ret
+
+; The following code was taken from an online source
+; It is only used to print integers - I was unable to get this working alone
+
+_printRAX:
+    mov rcx, digitSpace
+    mov rbx, 10
+    mov [rcx], rbx
+    inc rcx
+    mov [digitSpacePos], rcx
+
+_printRAXLoop:
+    mov rdx, 0
+    mov rbx, 10
+    div rbx
+    push rax
+    add rdx, 48
+
+    mov rcx, [digitSpacePos]
+    mov [rcx], dl
+    inc rcx
+    mov [digitSpacePos], rcx
+
+    pop rax
+    cmp rax, 0
+    jne _printRAXLoop
+
+_printRAXLoop2:
+    mov rcx, [digitSpacePos]
+
+    mov rax, 1
+    mov rdi, 1
+    mov rsi, rcx
+    mov rdx, 1
+    syscall
+
+    mov rcx, [digitSpacePos]
+    dec rcx
+    mov [digitSpacePos], rcx
+
+    cmp rcx, digitSpace
+    jge _printRAXLoop2
+
+    ret