From: Keith Owens <kaos@sgi.com>
To: linux-ia64@vger.kernel.org
Subject: Re: [Linux-ia64] Unwind can load wrong data from pt_regs
Date: Mon, 09 Dec 2002 22:04:25 +0000 [thread overview]
Message-ID: <marc-linux-ia64-105590709805527@msgid-missing> (raw)
In-Reply-To: <marc-linux-ia64-105590709805516@msgid-missing>
On Mon, 9 Dec 2002 13:21:07 -0800,
David Mosberger <davidm@napali.hpl.hp.com> wrote:
>>>>>> On Mon, 09 Dec 2002 19:35:03 +1100, Keith Owens <kaos@sgi.com> said:
>
> Keith> This implicitly assumes that when a fr or br register is
> Keith> required from pt_regs, info->sp is pointing to pt_regs. But
> Keith> info->sp is modified as the code unwinds through each
> Keith> function. The above code only gives correct results for
> Keith> register lookups from the failing function. Unwinding and
> Keith> accessing a fr or br register from earlier functions loads
> Keith> incorrect values for those registers.
>
>Yes, this is something that has been fixed already in the user-level
>libunwind. It's not hard to fix, just someone needs to get around to
>do it. I don't think it's a critical issue, since it only happens for
>nested traps. I assume you saw this with kdb?
How did you guess :). I will look at libunwind and do a kernel fix.
next prev parent reply other threads:[~2002-12-09 22:04 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-12-09 8:35 [Linux-ia64] Unwind can load wrong data from pt_regs Keith Owens
2002-12-09 21:21 ` David Mosberger
2002-12-09 22:04 ` Keith Owens [this message]
2002-12-09 22:17 ` David Mosberger
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