section .data                           ;section declaration

msg     db      "Hello, world!",0xA     ;our dear string

len     equ     $ - msg                 ;length of our dear string

section .text                           ;section declaration

                       ;we must export the entry point to the ELF linker or

   global _start       ;loader. They conventionally recognize _start as their

                       ;entry point. Use ld -e foo to override the default.

_start:

;write our string to stdout

       mov     eax,   ;system call number (sys_write)

       mov     ebx,   ;first argument: file handle (stdout)

       mov     ecx,msg ;second argument: pointer to message to write

       mov     edx,len ;third argument: message length

       int     0x80    ;call kernel

;and exit

       mov     eax,   ;system call number (sys_exit)

       xor     ebx,ebx ;first syscall argument: exit code

       int     0x80    ;call kernel