Please find the ARM code for finding the desired term in
Fibonnaci Sequence
.LC0:
        .ascii  \"Enter
the desired Fibonacci term: \000\"
.LC1:
        .ascii  \"%d\000\"
.LC2:
        .ascii  \"Fibonacci
of negative number is not possible.\000\"
.LC3:
        .ascii  \"The
%d of Fibonacci is %d\012\000\"
main:
        push    {fp,
lr}
        add     fp,
sp, #4
        sub     sp,
sp, #8
        ldr     r0,
.L5
        bl      printf
        sub     r3,
fp, #12
        mov     r1,
r3
        ldr     r0,
.L5+4
        bl      __isoc99_scanf
        ldr     r3,
[fp, #-12]
        cmp     r3,
#0
        bge     .L2
        ldr     r0,
.L5+8
        bl      puts
        b       .L3
.L2:
        ldr     r3,
[fp, #-12]
        mov     r0,
r3
        bl      fibonacci
        str     r0,
[fp, #-8]
        ldr     r3,
[fp, #-12]
        ldr     r2,
[fp, #-8]
        mov     r1,
r3
        ldr     r0,
.L5+12
        bl      printf
.L3:
        mov     r3,
#0
        mov     r0,
r3
        sub     sp,
fp, #4
        pop     {fp,
lr}
        bx      lr
.L5:
        .word   .LC0
        .word   .LC1
        .word   .LC2
        .word   .LC3
fibonacci:
        push    {r4,
fp, lr}
        add     fp,
sp, #8
        sub     sp,
sp, #12
        str     r0,
[fp, #-16]
        ldr     r3,
[fp, #-16]
        cmp     r3,
#0
        bne     .L8
        mov     r3,
#0
        b       .L9
.L8:
        ldr     r3,
[fp, #-16]
        cmp     r3,
#1
        bne     .L10
        mov     r3,
#1
        b       .L9
.L10:
        ldr     r3,
[fp, #-16]
        sub     r3,
r3, #1
        mov     r0,
r3
        bl      fibonacci
        mov     r4,
r0
        ldr     r3,
[fp, #-16]
        sub     r3,
r3, #2
        mov     r0,
r3
        bl      fibonacci
        mov     r3,
r0
        add     r3,
r4, r3
.L9:
        mov     r0,
r3
        sub     sp,
fp, #8
        pop     {r4,
fp, lr}
        bx      lr