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From: applix@runxtsa.runx.oz.au (Andrew Morton)
Newsgroups: comp.unix.wizards
Subject: Re: What machines core dump on deref of NULL?
Message-ID: <1894@runxtsa.runx.oz.au>
Date: 29 Jun 90 02:43:36 GMT
References: <31079@cup.portal.com>
Organization: RUNX Unix Timeshare.  Sydney, Australia.
Lines: 12

> 
> 	     I recently found to my delight that the Sparc architecture
> 	core dumps if a NULL pointer is dereferenced, and I want to find
> 	other systems that do this.  [ stuff deleted ]
> 	     What other machines do this?  I know that the 3B2 and 3B15
> 	don't do it, and neither does AT&T UNIX on the 386.

	The NCR Tower series (680x0 System V boxes) do this.  Executables
are loaded at address 0x8000 and a reference to any address lower
than that will make your program drop core.  I agree that this
is a very useful feature.  If this breaks any existing code,
then the code is already broken!