test/lnxhello.asm

   1 ;
   2 ; Assembly "Hello, World!" for Linux
   3 ;
   4
   5
   6 ; Properly defined in <sys/syscall.h>
   7 %define SYS_exit        1
   8 %define SYS_write       4
   9
  10         section .text
  11
  12         global _start
  13 _start:
  14         ; gdb doesn't like to stop at the entry point address, so
  15         ; we put a nop here for pure convenience
  16         nop
  17
  18
  19 write_hello:
  20         mov edx, hello_len
  21         mov ecx, hello
  22
  23 .loop:
  24         mov eax, SYS_write
  25         mov ebx, 1                      ; stdout
  26         int 80h
  27
  28         cmp eax, -4096
  29         ja error
  30
  31         add ecx, eax
  32         sub edx, eax
  33         jnz .loop
  34
  35 ok:
  36         mov eax, SYS_exit
  37         xor ebx, ebx
  38         int 80h
  39         hlt
  40
  41 error:
  42         mov eax, SYS_exit
  43         mov ebx, 1              ; Error
  44         int 80h
  45         hlt
  46
  47         section .rodata
  48 hello:  db "Hello, World!", 10
  49 hello_len equ $-hello