test/lnxhello.asm

   1 ;Testname=aout;  Arguments=-faout  -olnxhello.o -Ox; Files=stdout stderr lnxhello.o
   2 ;Testname=aoutb; Arguments=-faoutb -olnxhello.o -Ox; Files=stdout stderr lnxhello.o
   3 ;Testname=as86;  Arguments=-fas86  -olnxhello.o -Ox; Files=stdout stderr lnxhello.o
   4 ;Testname=elf32; Arguments=-felf32 -olnxhello.o -Ox; Files=stdout stderr lnxhello.o
   5
   6 ;
   7 ; Assembly "Hello, World!" for Linux
   8 ;
   9
  10
  11 ; Properly defined in <sys/syscall.h>
  12 %define SYS_exit        1
  13 %define SYS_write       4
  14
  15         section .text
  16
  17         global _start
  18 _start:
  19         ; gdb doesn't like to stop at the entry point address, so
  20         ; we put a nop here for pure convenience
  21         nop
  22
  23
  24 write_hello:
  25         mov edx, hello_len
  26         mov ecx, hello
  27
  28 .loop:
  29         mov eax, SYS_write
  30         mov ebx, 1                      ; stdout
  31         int 80h
  32
  33         cmp eax, -4096
  34         ja error
  35
  36         add ecx, eax
  37         sub edx, eax
  38         jnz .loop
  39
  40 ok:
  41         mov eax, SYS_exit
  42         xor ebx, ebx
  43         int 80h
  44         hlt
  45
  46 error:
  47         mov eax, SYS_exit
  48         mov ebx, 1              ; Error
  49         int 80h
  50         hlt
  51
  52         section .rodata
  53 hello:  db "Hello, World!", 10
  54 hello_len equ $-hello