AssemblyPrimeFinder/fib2.asm at main · BryanLim0214/AssemblyPrimeFinder · GitHub

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; This file contains a version of the fibonacci code which uses function calls to handle printing characters, and is formatted to work within the JASM interpreter (no QWORD)

section .data
newline db 0x0a, 0x00
nl_len equ $ - newline
nums db '0123456789'
num0 dq 1
num1 dq 1
num2 dq 1
count dq 2
iter dq 10

section .text
global _start

_start:

init:
mov rax, 1
push rax
push rax
call fn_print_number
call fn_print_number

loop_head:
mov r10, [iter]
cmp [count], r10
jge loop_exit

loop_body:
mov r10, [num0]
mov [num2], r10
mov r10, [num1]
add [num0], r10
mov r10, [num2]
mov [num1], r10

push [num0]
call fn_print_number

loop_tail:
add [count], 1
jmp loop_head

loop_exit:
mov rax, 1
int 0x80

fn_print_digit:
	pop rax
	pop rdx
	push rax
	mov rcx, nums
	add rcx, rdx
	mov rdx, 1
	mov rbx, 1
	mov rax, 4
	int 0x80
	ret

fn_print_number:
	pop rax
	pop rdx
	push rax
	cmp rdx, 10
	push rdx
	jge decomp
	call fn_print_digit

	mov rdx, nl_len
	mov rcx, newline
	mov rbx, 1
	mov rax, 4
	int 0x80
	ret
	decomp:
		decomp_loop_init:
			mov r13, 0
			pop r11
		decomp_loop_head:
			cmp r11, 0
			je decomp_loop_exit
		decomp_loop_body:
			mov rdx, 0
			mov rcx, 0
			mov rbx, 10
			mov rax, r11
			div rbx
			mov r11, rax
			push rdx
		decomp_loop_tail:
			add r13, 1
			jmp decomp_loop_head
		decomp_loop_exit:
			decomp_print_loop_init:
			decomp_print_loop_head:
				cmp r13, 0
				je decomp_print_loop_exit
			decomp_print_loop_body:
				call fn_print_digit
			decomp_print_loop_tail:
				sub r13, 1
				jmp decomp_print_loop_head
			decomp_print_loop_exit:
				mov rdx, nl_len
				mov rcx, newline
				mov rbx, 1
				mov rax, 4
				int 0x80
				ret