Need help with coding assignment in uVision using ARM assembly. The code should do the following:

$$ Have a null$-$terminated read only integer array called Inputs and a read$/$write array called Outputs with space reserved for up to ten integers.

$$ Have a subroutine called Cubes that takes the value in r$0$ and cubes it $($so returned r$0=$ passed r$03$

$$ Have a subroutine called MathFun that performs $4$x$3+$x$/8+17$ and returns the result in r$0.$ The value for x will be passed in r$0$ and the mul$/$div instructions should not be used. Treat r$0$ as signed. This subroutine should call the Cubes subroutine as needed.

$$ Have a subroutine called ShiftFun that shifts the value in r$0$ three times to the left if it$$s positive $($when treated as signed$)$ or rotates it five times to the right if it$$s negative. The new value will also be returned in r$0.$

$$ Within the Main part of the code, you$$ll loop through the Inputs array until you reach the null termination. For each value in Inputs, you$$ll call MathFun if it$$s odd and ShiftFun if it$$s even, then store the returned result in the corresponding Outputs array slot.

Example Inputs and Outputs arrays:

Inputs dcd $0$xFFFFFFF$7,0$x$18,0$x$2222,0$x$51,0$x$80000000$

;$0$xFFFFFFF$7$ is odd, so you$$d call MathFun and get $0$xFFFFF$4$AC

;$0$x$00000018$ is even and positive $($MSB$=0),$ so you$$d call ShiftFun and shift

left $3$ to get $0$x$00000$C$0$

;$0$x$00002222$ is even and positive, so you$$d call ShiftFun and shift left $3$ to

get $0$x$00011110$

;$0$x$00000051$ is odd, so you$$d call MathFun and get $0$x$000818$C$0$

;$0$x$08000000$ is even and negative, so you$$d call ShiftFun and rotate right $5$

to get $0$x$04000000$

Here is the code I have so far that does not work:

AREA RESET, CODE

THUMB

ENTRY

Main

ldr $ro,=$Input

$1drrl,=$output

strb r$4,[r0],$#$1$

cmp rl$,$ #$0$

beq Done

tst rl$,$ #$1$

beq ShiftFun

b MathFun

mov $r2,$#$0$

mov $r3,$#$0$

Cubes

push $\{1l\}$

mul $r3,r2,r2$

mul $r2,r3,r2$

$bx$ lr

MathFun

push $\{$lis

bl Cubes

lsr $ro,$#$3$

adds $r4,r2,r0$

adds r$4,$ #$0$x$10001$

pop $\{lr\}$

ShiftFun

cmp ro$,$ #$0$

bge ShiftFunPositive

ror $r4,$#$5$

bx lr

ShiftFunPositive

push $\{1l\}$

$1$ sl $4,$#$3$

strb r$4,[$r$1]$

$bx$ lr

Done

b$.$

Input ded $0$xFFFFFFF$7,0$x$18,0$x$2222,0$x$51,0$x$80000000$

AREA HW$7$b$,$ DATA

Output space $10$

END