From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Phileas Fogg <phileas-fogg@mail.ru>
Cc: linuxppc-dev <linuxppc-dev@lists.ozlabs.org>
Subject: Re: PS3: Strange issue with kexec and FreeBSD loader
Date: Thu, 21 Feb 2013 17:46:14 -0600 [thread overview]
Message-ID: <1361490374.4676.58.camel@pasglop> (raw)
In-Reply-To: <5126955B.9070808@mail.ru>
On Thu, 2013-02-21 at 22:44 +0100, Phileas Fogg wrote:
> Stripped OpenWRT image:
> ------------------------
>
> c00000000001a474: 48 00 00 05 bl 0xc00000000001a478
> c00000000001a478: 7c a8 02 a6 mflr r5
> c00000000001a47c: 38 a5 00 1c addi r5,r5,28
> c00000000001a480: 7c 21 0b 78 mr r1,r1
> c00000000001a484: 80 85 00 00 lwz r4,0(r5)
> c00000000001a488: 2c 04 00 00 cmpwi r4,0
> c00000000001a48c: 40 82 00 62 bnea- 0x60
> c00000000001a490: 4b ff ff f0 b 0xc00000000001a480
> c00000000001a494: 00 00 00 00 .long 0x0
> c00000000001a498: a0 6d 00 48 lhz r3,72(r13)
> c00000000001a49c: 48 00 00 11 bl 0xc00000000001a4ac
Smell like a bad stack pointer to me...
One thing I noticed is that kexec doesn't seem to hard disable
interrupts, which is ... fishy at best. It should do that
before it switches stacks around. Dunno if that's the cause
of the problem but it might be worth adding a hard_irq_disable()
after all the local_irq_disable(), making sure we are hard
disabled before going into asm.
Cheers,
Ben.
next prev parent reply other threads:[~2013-02-21 23:46 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-08 23:10 PS3: Strange issue with kexec and FreeBSD loader Phileas Fogg
2013-02-16 10:53 ` Phileas Fogg
2013-02-16 22:14 ` Phileas Fogg
2013-02-16 23:12 ` Phileas Fogg
2013-02-17 8:53 ` Geert Uytterhoeven
2013-02-17 12:40 ` Phileas Fogg
2013-02-21 0:14 ` Geoff Levand
2013-02-16 18:51 ` Phileas Fogg
2013-02-19 18:40 ` Phileas Fogg
2013-02-19 19:54 ` Phileas Fogg
2013-02-20 20:43 ` Phileas Fogg
2013-02-21 0:32 ` Benjamin Herrenschmidt
2013-02-21 20:38 ` Phileas Fogg
2013-02-21 20:35 ` Benjamin Herrenschmidt
2013-02-21 21:44 ` Phileas Fogg
2013-02-21 23:46 ` Benjamin Herrenschmidt [this message]
2013-02-22 20:49 ` Phileas Fogg
2013-02-22 19:52 ` Benjamin Herrenschmidt
2013-02-22 23:41 ` Phileas Fogg
2013-02-22 22:45 ` Benjamin Herrenschmidt
2013-02-22 23:53 ` Phileas Fogg
2013-02-21 22:06 ` Phileas Fogg
2013-02-21 23:47 ` Benjamin Herrenschmidt
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