help with my Assembly code $,$ it not working $,$ cuz of Segmention fault

$.$global main

$.$global getLength

$.$global getWidth

$.$global getArea

$.$global displayData

$.$section $.$rodata

promptLength: $.$asciz "Enter the rectangle's length: $"$

promptWidth: $.$asciz "Enter the rectangle's width: $"$

outputArea: $.$asciz "The rectangle with length $\%$d and width $\%$d has an area of $\%$d

$"$

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

$.$section $.$data

length: $.$word $0$

width: $.$word $0$

$.$text

$//$ Function to get the rectangle's length

getLength:

push $\{$lr$\}$

ldr r$0,=$promptLength $//$ Load prompt for length

bl printf $//$ Print the prompt

ldr r$0,=$inputFormat

ldr r$1,=$length $//$ Use the address of $`$length$`$

bl scanf $//$ Get user input for length

ldr r$0,[$r$1]//$ Load length from memory into r$0$

pop $\{$pc$\}//$ Return with length in r$0$

$//$ Function to get the rectangle's width

getWidth:

push $\{$lr$\}$

ldr r$0,=$promptWidth $//$ Load prompt for width

bl printf $//$ Print the prompt

ldr r$0,=$inputFormat

ldr r$1,=$width $//$ Use the address of $`$width$`$

bl scanf $//$ Get user input for width

ldr r$0,[$r$1]//$ Load width from memory into r$0$

pop $\{$pc$\}//$ Return with width in r$0$

$//$ Function to calculate the rectangle's area

getArea:

push $\{$lr$\}$

mul r$0,$ r$0,$ r$1//$ r$0=$ r$0*$ r$1($length $*$ width$)$

pop $\{$pc$\}//$ Return with area in r$0$

$//$ Function to display the rectangle's data

displayData:

push $\{$lr$\}$

ldr r$0,=$outputArea $//$ Load output format string

mov r$1,$ r$2//$ Move length to r$1$

mov r$2,$ r$3//$ Move width to r$2$

mov r$3,$ r$4//$ Move area to r$3$

bl printf $//$ Print formatted output

pop $\{$pc$\}$

$//$ Main function to coordinate the flow

main:

push $\{$lr$\}$

$//$ Get length

bl getLength $//$ Call getLength

mov r$2,$ r$0//$ Store length in r$2$

$//$ Get width

bl getWidth $//$ Call getWidth

mov r$3,$ r$0//$ Store width in r$3$

$//$ Calculate area

mov r$0,$ r$2//$ Move length to r$0$ for getArea

mov r$1,$ r$3//$ Move width to r$1$ for getArea

bl getArea $//$ Calculate area

mov r$4,$ r$0//$ Store area in r$4$

$//$ Display the result

bl displayData $//$ Show length, width, and area

mov r$0,$ #$0//$ Exit code $0$

pop $\{$pc$\}$

$1.$ Rectangle Area

The program will ask the user to enter the width and length of a rectangle, then display the rectangle's area. The program calls the following functions, which have not been written:

$-$ getLength$-$This function should ask the user to enter the rectangle's length then return that value.

$-$ getWidth$-$This function should ask the user to enter the rectangle's width then return that value.

$-$ getArea$-$This function should accept the rectangle's length and width as arguments and return the rectangle's area. The area is calculated by multiplying the length by the width.

$-$ displayData$-$This function should accept the rectangle's length, width, and area as arguments and display them in an appropriate message on the screen.