$.$section $.$data

input$\_$prompt : $.$asciz "Please enter a number betwen $1$ and $10$

$"$

input$\_$spec : $.$asciz $"\%$d

$"$

fib : $.$asciz $"\%$d

$"$

oob$\_$mess : $.$asciz "Input is out of bounds

$"$

$.$section $.$text

$.$global main

main:

$//$print greeting and ask for n between $1-10$

ldr x$0,=$input$\_$prompt

bl printf

sub sp$,$ sp$,$ #$4$

$//$read inputted number

ldr x$1,=$input$\_$spec

mov x$0,$ sp

bl scanf

$//$check for out of bound input

ldr x$2,[$sp$]$

$//$compare if value inputted is less than $1$

cmp x$2,1$

blt checkOutOfBounds

$//$compare if value inputted is greater than $10$

cmp x$2,10$

bgt checkOutOfBounds

mov x$0,$ x$2$

bl recurse

ldr x$0,=$ recurse

bl printf

b exit

checkOutOfBounds:

ldr x$0,=$ oob$\_$mess

bl printf

b exit

base$\_$case$\_1$:

mov x$0,$ #$0$

ret

base$\_$case$\_2$:

mov x$0,$ #$1$

ret

recurse:

cmp x$0,$ #$1$

b$.$eq base$\_$case$\_1$

cmp x$0,$ #$2$

b$.$eq base$\_$case$\_2$

$//$allocate stack space for call with n$-1$

sub sp$,$ sp$,$ #$16$

str x$30,[$sp$,$ #$8]$

str x$0,[$sp$]$

sub x$0,$ x$0,$ #$2$

bl recurse

$//$load result from fibonacci$($n$-1)$ into x$2$

str x$0,[$sp$,$ #$8]$

ldr x$0,[$sp$]$

ldr x$30,[$sp$,$ #$8]$

add sp$,$ sp$,$ #$16$

sub x$0,$ x$0,$ #$1$

bl recurse

add x$0,$ x$0,$ x$29$

ret

# branch to this label on program completion

exit:

mov x$0,$ #$0$

mov x$8,$ #$93$

svc #$0$

It is a fibonacci sequence procedure fib

$($argument: n$)$

return fib$($n$-2)+$fib$($n$-1)$

$1$should return $0($base case$)$

$2$should return $1($base case$)$

$3$ should return $1$

$4$ should return $2$

$5$should return $3$

$6$should return $5$

$7$should return $8$

$8$should return $13$

$9$should return $21$

$10$should return $34$

For some reason the program is printing the "Please enter a number"... then automatically printing "Input is out of bounds and quitting"