ASM Workshop

.text
.align 2
.thumb
.thumb_func

main:
    push {lr}
    ldr r0, =(0x020370B8)
        ldrh r1, [r0]
    mov r2, #0x1
    mov r3, #0x1
    cmp r1, #0x0
    beq storeval_r2greater
    
loop:
    cmp r1, #0x1
    beq storeval_r3greater

    add r2, r2, r3
    sub r1, r1, #0x1
    cmp r1, #0x1
    beq storeval_r2greater

    add r3, r2, r3
    sub r1, r1, #0x1

    b loop

storeval_r2greater:
    strh r2, [r0]
    b end

storeval_r3greater:
    strh r3, [r0]
    b end

end:
    pop {pc}

.align 2

.text
.align 2
.thumb
.thumb_func

main:
    push {lr}
    ldr r1, =(0x8044EC9)
    bl linker
    ldr r1, =(0x20370B8)
    lsl r0, r0, #0x1B
    lsr r0, r0, #0x1B
    cmp r0, #0x18
    bhs higher

end:
    strh r0, [r1]
    pop {pc}

higher:
    sub r0, r0, #0x8
    b end

linker:
    bx r1

.align 2

.text
.align 2
.thumb
.thumb_func

main:
    push {lr}
    ldr r0, =(0x8A71F81)
    bl  linker
    ldr r0, =(0x8A71E81)
    bl  linker
    pop {pc}

linker:
    bx r0

.align 2

.text
.align 2
.thumb
.thumb_func

main:
    push {r4-r5, lr}
    ldr r0, =(0x20370B8)
        ldrh r5, [r0]
    mov r4, #0x0

loop:
    add r4, r4, #0x1
        strh r4, [r0]
    ldr r0, =(0x8A71E81)
    bl  linker
    ldr r0, =(0x20370B8)
    ldrh r2, [r0]
    cmp r5, r2
    beq end
    cmp r5, r2
    blo notfibo
    b loop

notfibo:
    mov r4, #0x0

end:
    strh r4, [r0]
    pop {r4-r5, pc}

linker:
    bx r0

.align 2