Date: Sun, 04 Aug 2013 07:03:21 -0600 From: Ian Lepore <ian@FreeBSD.org> To: Andrew Turner <andrew@fubar.geek.nz> Cc: freebsd-arm@FreeBSD.org, mattia.rossi.mate@gmail.com Subject: Re: Kernel Panic on DREAMPLUG: Alignment Fault 1 Message-ID: <1375621401.1149.1.camel@revolution.hippie.lan> 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>
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On Sat, 2013-08-03 at 17:31 +0100, Andrew Turner wrote: > On Sat, 03 Aug 2013 08:04:41 -0600 > Ian Lepore <ian@FreeBSD.org> 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<NO_SYNC_CACHE,NO_6_BYTE> > > 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.
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