I trying to make a random number generator made using assembly. To make the file and run it I’m using vim and gcc but I keep getting a segmentation fail.

.section .data 
seed: .word OxA5A5A5A5 // Initial seed for 
the LFSR 
.section .text .global main 
main: 
// Start and initialization of the seed 
LDR RO, =seed 
// Load address of 
seed into RO 
LDR R1, [RO] 
// Load seed value into 
R1 
generate_random: 
// Perform LFSR 
LSR R2, R1, #1 
// Logical shift right 
AND R3, R1, #1 
// AND with 1 to get 
LSB 
EOR R2, R2, R3, LSL #31 // XOR with LSB shifted to MSB 
MOV R1, R2 
// Move result back to 
R1 
// Store new seed 
STR R1, [RO] 
// Store updated seed 
back to memory 
// Use lower bits of the seed to 
determine LED output 
AND R4, R1, #0xFF // Mask lower 8 bits 
BL set_leds 
function 

// Branch to set_leds 
wait_button: 
// Wait for button press 
LDR R5, =0xFE200000 // Base address 
ADD R6, R5, #0x34 // GPIO Pin Level Register 
LDR R6, [R6] // Load GPIO level register 
LDR R7, =0x0400 
// Load constant (1 
<< 10) into R7 
AND R6, R6, R7 
// Check GPIO pin 10 
(button) 
BEQ wait_button 
// Loop until button 
is pressed 
// Delay loop for debouncing 
MOV R7, #0x3F0000 // Load delay value 
delay_loop: 
SUBS R7, R7, #1 // Decrement delay 
counter 
BNE delay_loop 
finished 
// Loop until delay is 
B generate_random // Go back to generate_random 
// Function to set the LEDs 
set_leds: 
PUSH {R4-R7, LR} // Save the return 
address and used registers 
// Setup for the GPIO 
LDR R6, =0xFE200000 // Base address for GPIO on Raspberry Pi 4 
// Set GPIO pins 2-9 to output 
LDR R7, =0x000003FC // Load constant (0b11111111 << 2) into R7 
STR R7, [R6, #0x04] // Set as output 
// Clear the GPIO pins 
LDR R7, =0x000003FC // Load constant 
(Ob11111111 << 2) into R7 
STR R7, [R6, #0x28] // Clear the pins 
// Set the GPIO pins based on R4 
MOV R7, R4 
AND R7, R7, #0xFF 
LDR R8, =0x000000FC // Load constant 
(0b11111111 << 2) into R8 
ORR R7, R7, R8 
STR R7, [R6, #0x1C] // Set the pins 
POP {R4-R7, LR} // Restore the registers and return address 
BX LR 
// Return from function

I ran the gdb to see were its failing at set_leds and backtraces to generate_random. I
have also ran a Python script to check my GPIO pins and they were good. I have also try remaking the whole file and directory and using small bits of code to try and troubleshoot it.