From: "Manfred Spraul" <manfred@colorfullife.com>
To: "Frank Cornelis" <Frank.Cornelis@rug.ac.be>
Cc: <linux-kernel@vger.kernel.org>
Subject: Re: ptrace on i386
Date: Sat, 1 Dec 2001 11:46:26 +0100 [thread overview]
Message-ID: <000701c17a55$6ec0ea30$010411ac@local> (raw)
>
> In linux/arch/i386/kernel/ptrace.c next code is being used in the xxxreg
> functions:
> if (regno > GS*4)
> regno -= 2*4;
> Why this discontinuity?
Backward compatibility. The syscall entry point changed between 2.0 and 2.2, but
that change must remain invisible to user space apps. the "-= 2*4" converts old offsets
to new offsets (or the other way around)
--
Manfred
next reply other threads:[~2001-12-01 10:46 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-12-01 10:46 Manfred Spraul [this message]
-- strict thread matches above, loose matches on Subject: below --
2001-12-01 10:17 ptrace on i386 Frank Cornelis
2001-12-01 13:56 ` Brian Gerst
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