From owner-freebsd-arm@FreeBSD.ORG Sun Aug 4 13:03:33 2013 Return-Path: Delivered-To: freebsd-arm@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTP id B0D4F52B for ; Sun, 4 Aug 2013 13:03:33 +0000 (UTC) (envelope-from ian@FreeBSD.org) Received: from mho-01-ewr.mailhop.org (mho-03-ewr.mailhop.org [204.13.248.66]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id 814022800 for ; Sun, 4 Aug 2013 13:03:33 +0000 (UTC) Received: from c-24-8-230-52.hsd1.co.comcast.net ([24.8.230.52] helo=damnhippie.dyndns.org) by mho-01-ewr.mailhop.org with esmtpsa (TLSv1:AES256-SHA:256) (Exim 4.72) (envelope-from ) id 1V5xy1-000NJK-Nj; Sun, 04 Aug 2013 13:03:25 +0000 Received: from [172.22.42.240] (revolution.hippie.lan [172.22.42.240]) by damnhippie.dyndns.org (8.14.3/8.14.3) with ESMTP id r74D3LuA024872; Sun, 4 Aug 2013 07:03:21 -0600 (MDT) (envelope-from ian@FreeBSD.org) X-Mail-Handler: Dyn Standard SMTP by Dyn X-Originating-IP: 24.8.230.52 X-Report-Abuse-To: abuse@dyndns.com (see http://www.dyndns.com/services/sendlabs/outbound_abuse.html for abuse reporting information) X-MHO-User: U2FsdGVkX19qmJsngkuXd5mRSioUypQ0 Subject: Re: Kernel Panic on DREAMPLUG: Alignment Fault 1 From: Ian Lepore To: Andrew Turner In-Reply-To: <20130803173135.76566eeb@bender.Home> References: <51F92F79.9010809@gmail.com> <1375309907.45247.185.camel@revolution.hippie.lan> <51F9C81A.7000106@gmail.com> <1375358623.45247.189.camel@revolution.hippie.lan> <51FA1D2B.9090009@gmail.com> <1375363713.45247.193.camel@revolution.hippie.lan> <51FA8946.8030301@gmail.com> <1375374521.45247.211.camel@revolution.hippie.lan> <20130803083248.342108c2@bender.Home> <1375538681.45247.273.camel@revolution.hippie.lan> <20130803173135.76566eeb@bender.Home> Content-Type: text/plain; charset="us-ascii" Date: Sun, 04 Aug 2013 07:03:21 -0600 Message-ID: <1375621401.1149.1.camel@revolution.hippie.lan> Mime-Version: 1.0 X-Mailer: Evolution 2.32.1 FreeBSD GNOME Team Port Content-Transfer-Encoding: 7bit Cc: freebsd-arm@FreeBSD.org, mattia.rossi.mate@gmail.com X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Porting FreeBSD to the StrongARM Processor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 04 Aug 2013 13:03:33 -0000 On Sat, 2013-08-03 at 17:31 +0100, Andrew Turner wrote: > On Sat, 03 Aug 2013 08:04:41 -0600 > Ian Lepore wrote: > > On Sat, 2013-08-03 at 08:32 +0100, Andrew Turner wrote: > > > Can you try the patch at [1]. It should fix the stack alignment in > > > exceptions. I suspect gcc is working in this case because it doesn't > > > generate any instructions that rely on the stack alignment, where > > > clang does. > > > > > > Andrew > > > > > > [1] http://people.freebsd.org/~andrew/trapframe_align2.diff > > > > It's actually not clang vs gcc, it's EABI vs OABI on armv5te. EABI > > fails the same with clang and gcc. > > > > With your patch and gcc EABI I get: > > > > ... > > da1: 40.000MB/s transfers > > da1: 15193MB (31116288 512 byte sectors: 255H 63S/T 1936C) > > da1: quirks=0x3 > > Fatal kernel mode data abort: 'Alignment Fault 1' > > trapframe: Fatal kernel mode data abort: 'Alignment Fault 1' > > trapframe: Fatal kernel mode data abort: 'Alignment Fault 1' > > trapframe: Fatal kernel mode data abort: 'Alignment Fault 1' > > [lots more lines of that] > > trapframe: Fatal kernel mode data abort: 'Alignment Fault 1' > > trapframe: Fatal kernel mode data abort: 'Alignment Fault 1' > > Fatal kernel mode prefetch abort at 0xFatal kernel mode data abort: > > 'Alignment Fault 1' trapframe: Fatal kernel mode data abort: > > 'Alignment Fault 1' trapframe: Fatal kernel mode data abort: > > 'Alignment Fault 1' > > > > And it just continued like that for quite a while, mostly data abort > > with the occasional prefetch abort thrown in. Eventually it locked > > hard. > > It looks like I missed setting the alignment in one of the ARMv4/5 > macros. I have an updated patch at [1]. > > [1] http://people.freebsd.org/~andrew/trapframe_align3.diff No change in behavior with align3 compared to align2.