From: Brian Gerst <bgerst@didntduck.org>
To: Linus Torvalds <torvalds@transmeta.com>
Cc: Andrew Morton <akpm@zip.com.au>, Hugh Dickins <hugh@veritas.com>,
Marcelo Tosatti <marcelo@conectiva.com.br>,
"H. Peter Anvin" <hpa@zytor.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] BUG preserve registers
Date: Sat, 09 Feb 2002 23:21:30 -0500 [thread overview]
Message-ID: <3C65F54A.D81ED990@didntduck.org> (raw)
In-Reply-To: <Pine.LNX.4.33.0202091335340.1196-100000@home.transmeta.com>
Linus Torvalds wrote:
>
> On Sat, 9 Feb 2002, Andrew Morton wrote:
> > >
> >
> > Is better, except the filename gets expanded multipe times into
> > the object file. How about:
> >
> > #define BUG() \
> > asm( "ud2\n" \
> > "\t.word %0\n" \
> > "\t.long %1\n" \
> > : : "i" (__LINE__), "i" (__FILE__))
>
> Even better.
>
> That way you can actually totally remove the "verbose bug" config option,
> because even the verbose BUG's aren't actually using up any noticeable
> amounts of space.
>
> This is all assuming that gcc doesn't create the string for inline
> functions that aren't used, which it probably cannot, so maybe this
> doesn't work out.
>
> Linus
Note that if you're going to do this you may want to use another vector
(ie. int $0x82) instead of the undefined opcode. That way you know for
certain that there will be valid debugging info following.
--
Brian Gerst
prev parent reply other threads:[~2002-02-10 4:21 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-02-09 8:13 [PATCH] BUG preserve registers Hugh Dickins
2002-02-09 8:32 ` Andrew Morton
2002-02-09 10:33 ` Hugh Dickins
2002-02-09 19:30 ` Linus Torvalds
2002-02-09 19:34 ` Andrew Morton
2002-02-09 21:37 ` Linus Torvalds
2002-02-09 20:00 ` H. Peter Anvin
2002-02-09 21:49 ` Linus Torvalds
2002-02-09 20:24 ` H. Peter Anvin
2002-02-09 20:11 ` Andrew Morton
2002-02-09 20:15 ` Linus Torvalds
2002-02-09 22:07 ` Andrew Morton
2002-02-10 2:41 ` Alan Cox
2002-02-10 4:20 ` Andrew Morton
2002-02-10 4:23 ` H. Peter Anvin
2002-02-10 4:28 ` Andrew Morton
2002-02-10 6:16 ` Linus Torvalds
2002-02-10 5:28 ` Andrew Morton
2002-02-10 7:23 ` Linus Torvalds
2002-02-10 6:28 ` Andrew Morton
2002-02-10 9:05 ` Andrew Morton
[not found] ` <200202110710.g1B7A5t28328@Port.imtp.ilyichevsk.odessa.ua>
2002-02-11 7:22 ` Andrew Morton
2002-02-11 17:19 ` Hugh Dickins
2002-02-11 19:48 ` Andrew Morton
2002-02-11 20:52 ` Hugh Dickins
2002-02-10 7:13 ` H. Peter Anvin
2002-02-10 8:53 ` arjan
2002-02-11 15:26 ` Jamie Lokier
2002-02-10 6:23 ` Eric W. Biederman
2002-02-10 6:50 ` Andrew Morton
2002-02-10 15:40 ` Eric W. Biederman
2002-02-10 7:08 ` Stevie O
2002-02-10 14:35 ` Olaf Dietsche
2002-02-10 4:55 ` Linus Torvalds
2002-02-10 5:03 ` Linus Torvalds
2002-02-10 4:21 ` Brian Gerst [this message]
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