My first linux ASM code

SECTION .data
 msg db "hello world",10
 len dw 12

SECTION .text
   global start
start:
 mov eax,4 ; the 'write' syscall
 mov ebx,1 ; on stdout
 mov ecx,msg ; the string
 mov edx,len ; its length
 int 0x80 ; interrupt
 mov eax,1 ; exit syscall
 mov ebx,0
 int 0x80 ;

Wooh!!! soon i will be reversing apps. nhahahaaa