section .text

   global _start          ;must be declared for linker (gcc)

_start:                   ;tell linker entry point

   mov  edx,1         ;message length

   mov  ecx,choice        ;message to write

   mov  ebx,1         ;file descriptor (stdout)

   mov  eax,4         ;system call number (sys_write)

   int  0x80          ;call kernel

​

   mov  eax,1         ;system call number (sys_exit)

   int  0x80          ;call kernel

​

section .data

choice DB 'y'