Fibonacci Numbers ARM64 Linux

fib-arm64.s

.data
fibs: .quad 0,0,0,0,0,0,0,0,0,0,0,0
size: .quad 12
printf_str: .asciz "%d\n"
head: .ascii "The Fibonacci numbers are:\n"
head_len = . - head

.text
.global main
main:
    ldr x0, =fibs
    ldr x5, =size
    ldr x5, [x5]
    mov x2, #1
    str x2, [x0]
    str x2, [x0, #8]
    add x1, x5, #-2
loop:
    ldr x3, [x0]
    ldr x4, [x0, #8]
    add x2, x3, x4
    str x2, [x0, #16]
    add x0, x0, #8
    add x1, x1, #-1
    cmp x1, #0
    bgt loop
print:
    mov x0, #1
    ldr x1, =head
    ldr x2, =head_len
    mov w8, #64
    svc #0
    
    ldr x21, =size
    ldr x21, [x21]
    ldr x20, =fibs
out:
    ldr x0, =printf_str
    ldr x1, [x20]
    bl printf
    add x20, x20, #8
    add x21, x21, #-1
    cmp x21, #0
    bgt out

exit:
    mov x0, #0
    mov w8, #93
    svc #0