GAS Assembly program segmentation fault (writing to auto variable) - c

Question

I intend to do this in C:
#include<stdio.h>
int main() {
int arr[5];
arr[0] = 5;
arr[1] = 0;
arr[2] = 1;
arr[3] = 3;
arr[4] = 4;
int max = 0;
for(int i = 0;i < 5;i++)
if(max < arr[i])
max = arr[i];
printf("%d\n", max);
return 0;
}
This is my code link: array_max.s. This is my assembly code in AT&T format :
.data
.text
.globl _start
_start:
movl $5, -20(%ebp)
movl $0, -16(%ebp)
movl $1, -12(%ebp)
movl $3, -8(%ebp)
movl $4, -4(%ebp)
movl $0, %ecx
movl $5, %eax
loop:
cmp $0, %eax
je terminate
cmp %ecx, -20(%ebp,%eax,4)
jg assign
jmp loop
terminate:
movl $4, %eax
movl $1, %ebx
movl $1, %edx
int $0x80
movl $1, %eax
int $0x80
ret
assign:
movl -20(%ebp,%eax,4), %ecx
ret
I am having a segmentation fault on the very first instruction movl $5, -20(%ebp). I am new to this, please help.

Answer 1

I am having a segmentation fault on the very first instruction movl $5, -20(%ebp).
You are not allocating any space on the stack for arr (i.e.: int arr[5]):
pushl %ebp
movl %esp, %ebp
subl $20,%esp //<--- memory allocation
In order to deallocate the memory allocated on the stack by restoring the previous stack frame, use the leave instruction just before ret.