Error while linking file

["Manjunath Naik" <peter.desouzain@xxxxxxxxx>]

Hi all,

  I was just tring the simple "hello world" assembly program in linux.
First time I was able to compile and link the file.
  I just changed something in that file, I got the following error while
linking it.

   test.o: file not recognized: File format not recognized

  I am not able tounderstand what is the exact problem with it.

  I had used the following two commands to compile nad link the progam.

   nasm -f aout test.asm
   ld -e _start -o test test.o

   my program looks as follows

 section .text
   global _start                       ;must be declared for linker (ld)

_start:                                 ;tell linker entry point

       mov     edx,len ;message length
       mov     ecx,msg ;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

msg     db      'Hello, world!',0xa     ;our dear string
len     equ     $ - msg                 ;length of our dear string

what might be the problem here?

Regards
Manjunath