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Date: Thu, 25 Aug 2011 16:39:44 +0300
From: Avi Kivity <avi@redhat.com>
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Subject: Re: [Qemu-devel] [PULL] slirp: Fix issues with -mms-bitfields
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To: Peter Maydell <peter.maydell@linaro.org>
Cc: Blue Swirl <blauwirbel@gmail.com>, TeLeMan <geleman@gmail.com>, Anthony Liguori <aliguori@us.ibm.com>, Jan Kiszka <jan.kiszka@web.de>, qemu-devel <qemu-devel@nongnu.org>

On 08/25/2011 04:36 PM, Peter Maydell wrote:
> On 25 August 2011 14:22, Avi Kivity<avi@redhat.com>  wrote:
> >  On 08/25/2011 04:13 PM, Jan Kiszka wrote:
> >>  Packing all structs is not really a good idea, more a last resort.
> >
> >  btw, how are the non-x86s handling this? by trapping and fixuping in the
> >  kernel?
>
> If a structure's packing means it doesn't adhere to the relevant
> alignment constraints for the architecture gcc will access the
> misaligned integers with a sequence of byte loads and stores.

Thanks, good to know.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.