From: Matt Fleming <matt@console-pimps.org>
To: linux-sh@vger.kernel.org
Subject: Re: Unaligned kernel access for __udivsi3_i4i
Date: Sat, 20 Feb 2010 00:08:56 +0000 [thread overview]
Message-ID: <20100220000856.GA9774@console-pimps.org> (raw)
In-Reply-To: <5ec3d7931002191551g21c0cda9le17729529b1afd78@mail.gmail.com>
On Sat, Feb 20, 2010 at 12:51:38AM +0100, Drasko DRASKOVIC wrote:
> Hi all,
> I am getting Unaligned kernel access on 0x809b7662
Hi Drasko,
I suspect that the reason that you're seeing these unaligned accesses is
because you are dividing by zero. That's what happens when you divide by
zero when using the libgcc softfpu divide functions; an unaligned access
is intentionally generated because SH has no other way of signalling
that an error occurred while doing the division.
To quote from gcc/config/sh/lib1func.asm in the GCC source,
"/* Lookup table translating positive divisor to index into table of
normalized inverse. N.B. the '0' entry is also the last entry of the
previous table, and causes an unaligned access for division by zero. */"
next prev parent reply other threads:[~2010-02-20 0:08 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-19 23:51 Unaligned kernel access for __udivsi3_i4i Drasko DRASKOVIC
2010-02-20 0:08 ` Matt Fleming [this message]
2010-02-20 0:24 ` Drasko DRASKOVIC
2010-02-20 11:47 ` Matt Fleming
2010-02-20 12:17 ` Paul Mundt
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