16 bit code for 186 processor

[Pannaga Bhushan]

Dear Sir/Madam,
                          I am using bin utils 2.11.2, which is the latest
available. I wrote a simple hello world program and compiled with gcc using
the -S option to get the .s (assembly file).  I inserted .code16 directive
in the line after the label main:

Then I assembled this with the command   -----    gcc file_name.s

The a.out file that I get from this process gives segmentation fault error
and dumps the core.

What are the steps to get a code that can execute on 186 processor( that is
16 bit processor).

Hope the procedure is simple and also hope that I get a reply soon.

Thanx in advance,
Pannaga Bhushan