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From: Andi Kleen <andi@firstfloor.org>
To: "Theodore Ts'o" <tytso@mit.edu>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Should a x86 gdb work under an x86_64 kernel?
Date: Mon, 03 Mar 2008 12:56:00 +0100	[thread overview]
Message-ID: <p73zltg6my7.fsf@bingen.suse.de> (raw)
In-Reply-To: <E1JTeeF-0005dk-Nv@closure.thunk.org> (Theodore Ts'o's message of "Mon\, 25 Feb 2008 09\:49\:43 -0500")

"Theodore Ts'o" <tytso@mit.edu> writes:

> Hi,
>
> 	I've noticed that if I try to use a 32-bit x86 gdb to debug a
> 32-bit program under a 64-bit x86_64 kernel, gdb (version 6.6-debian,
> from Ubuntu Gutsy) immediately core dumps as soon as I run the test
> program under the debugger.  Is this normal/expected/known bug?

It's clearly a bug. x86-64 compat user space should be 99+% compatible
and running full 32bit user land with a 64bit kernel is supposed to work.

The main exceptions are a few programs that rely on the 3GB address space
(these can be used with linux32 --3gb), some programs which
make bogus assumptions about /proc,/sys which cannot be fixed
and a few programs which use obscure driver specific ioctls with
no compat wrapper.

-Andi

      parent reply	other threads:[~2008-03-03 11:56 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-25 14:49 Theodore Ts'o
2008-02-25 16:14 ` Jeff Dike
2008-03-03 11:56 ` Andi Kleen [this message]

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