“Hello world” written using AT&T assembly

hello.S

.data
hello:
    .string "Hello world!\n"

.text
.globl _start
_start:
    movl $4, %eax # write(1, hello, strlen(hello))
    movl $1, %ebx
    movl $hello, %ecx
    movl $13, %edx
    int  $0x80

    movl $1, %eax # exit(0)
    movl $0, %ebx
    int  $0x80

You need to move 14 to edx to include the newline.

You need to move 14 to edx to include the newline.

This is better than counting with your fingers.

hello:
    .string "Hello world!\n"
hello_end: 
   .equ len, hello - hello_end
.text
.globl _start 
_start:
        movq $1, %rax
        movq $1, %rdi 
        movq $string, %rsi
        movq $len, %rdx
        syscall
        movq $60, %rax
        movq $0, %rdi
        syscall

`