Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!swrinde!elroy.jpl.nasa.gov!lll-winken!uunet!auspex!guy
From: guy@auspex.auspex.com (Guy Harris)
Newsgroups: comp.unix.questions
Subject: Re: why different swapping modes on executables?
Message-ID: <6923@auspex.auspex.com>
Date: 30 Mar 91 23:53:57 GMT
References: <1991Mar12.104352.23097@kithrup.COM> <573@adpplz.UUCP> <126505@uunet.UU.NET>
Organization: Auspex Systems, Santa Clara
Lines: 11

>HAHAHAHA! It's even worse than that! The Magic Number was a JUMP
>(actually a branch) across the a.out header. A 407 executable
>had a seven word (14 byte) header, a 410, eight words, 411 nine...
>Sneaky, huh?

*Real* sneaky, given that the header was, for all three types of
executable, 8 words long....

"407" actually skipped all 8 words; the PC to which was added 7*2 was
the PC of the instruction *following* the branch.  "410" was intended to
be "407+1", not "br .+10".