From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mike Frysinger <vapier@gentoo.org>
Date: Fri, 12 Feb 2010 00:56:03 +0000
Subject: Re: parsic/sh/sparc tracehook breakage when tracing signals
Message-Id: <201002111956.06261.vapier@gentoo.org>
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List-Id: <linux-sh.vger.kernel.org>
References: <201002111910.50596.vapier@gentoo.org> <20100211.163950.206150918.davem@davemloft.net>
In-Reply-To: <20100211.163950.206150918.davem@davemloft.net>
To: David Miller <davem@davemloft.net>
Cc: linux-sh@vger.kernel.org, linux-parisc@vger.kernel.org, sparclinux@vger.kernel.org, roland@redhat.com, linux-kernel@vger.kernel.org

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On Thursday 11 February 2010 19:39:50 David Miller wrote:
> From: Mike Frysinger <vapier@gentoo.org>
> > when i ported the Blackfin code to the tracehook framework, i copied a
> > latent bug from the sparc port.  trying to trace another process while
> > handling signals no longer worked (and subsequently broke some of the g=
db
> > tests).
>=20
> What you seem to be missing is that on Sparc TIF_SINGLESTEP will never
> be set, because it does not support hardware single step.
>=20
> This thread flag is not even defined on that platform.

my point is that these arches never call ptrace_notify(SIGTRAP) from their=
=20
signal handlers.  maybe the arch is unable to due to some port/hardware=20
limitation and this is currently the expected behavior.

dont get me wrong ... i dont particularly care if your arch has a bug in it=
=20
here.  my arch did have a bug and on the off chance that others did too, i=
=20
thought i'd drop an e-mail to people.  if your arch is in the "limited"=20
category, feel free to ignore this.
=2Dmike

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