From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Fri, 04 Oct 2002 15:17:48 +0200 (CEST) Received: from p508B493B.dip.t-dialin.net ([80.139.73.59]:26274 "EHLO dea.linux-mips.net") by linux-mips.org with ESMTP id ; Fri, 4 Oct 2002 15:17:47 +0200 Received: (from ralf@localhost) by dea.linux-mips.net (8.11.6/8.11.6) id g94DHIb16581; Fri, 4 Oct 2002 15:17:18 +0200 Date: Fri, 4 Oct 2002 15:17:18 +0200 From: Ralf Baechle To: "Maciej W. Rozycki" Cc: Alan Cox , Carsten Langgaard , Dominic Sweetman , linux-mips@linux-mips.org Subject: Re: Promblem with PREF (prefetching) in memcpy Message-ID: <20021004151718.A16064@linux-mips.org> References: <1033734968.31839.5.camel@irongate.swansea.linux.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i In-Reply-To: ; from macro@ds2.pg.gda.pl on Fri, Oct 04, 2002 at 03:01:17PM +0200 Return-Path: X-Envelope-To: <"|/home/ecartis/ecartis -s linux-mips"> (uid 0) X-Orcpt: rfc822;linux-mips@linux-mips.org Original-Recipient: rfc822;linux-mips@linux-mips.org X-archive-position: 369 X-ecartis-version: Ecartis v1.0.0 Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org X-original-sender: ralf@linux-mips.org Precedence: bulk X-list: linux-mips On Fri, Oct 04, 2002 at 03:01:17PM +0200, Maciej W. Rozycki wrote: > > > Is a bus error exception an address related exception ? > > > I'm afraid some implementation think it's not. > > > > So you need an option for broken systems, no new news 8) > > For MIPS a bus error exception is not an address related exception by > definition (not surprising, anyway). Specifically, the BadVaddr register > is not set upon one. A particular pain is the exception can be delayed almost arbitrarily due to posted writes. So quite frequently there is no easy association between the machine state at exception time and the cause ... Ralf