Path: utzoo!mnetor!uunet!husc6!cmcl2!brl-adm!brl-smoke!gwyn
From: gwyn@brl-smoke.ARPA (Doug Gwyn )
Newsgroups: comp.unix.wizards
Subject: Re: Aliasing text and data segments of a process
Message-ID: <7176@brl-smoke.ARPA>
Date: 25 Jan 88 00:00:29 GMT
References: <202@sdti.UUCP> <3106@super.upenn.edu> <453@minya.UUCP>
Reply-To: gwyn@brl.arpa (Doug Gwyn (VLD/VMB) <gwyn>)
Organization: Ballistic Research Lab (BRL), APG, MD.
Lines: 14

In article <453@minya.UUCP> jc@minya.UUCP (John Chambers) writes:
>Sure enough, there is supposedly separate address spaces for both...

You have to ask the linker for this feature, assuming your hardware
and OS support it; it's not the default.

>| 	code = (char*)malloc(1000);

code -> D-space.

>| 	fct = (int(*)())code;	/* Point to the malloc()ed data area */
>| 	i = (*fct)(7,9);	/* Call the copy */

If this works, you do not have split I&D space.