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Re: [Qemu-devel] [PULL] slirp: Fix issues with -mms-bitfields


From: Avi Kivity
Subject: Re: [Qemu-devel] [PULL] slirp: Fix issues with -mms-bitfields
Date: Thu, 25 Aug 2011 16:39:44 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:6.0) Gecko/20110816 Thunderbird/6.0

On 08/25/2011 04:36 PM, Peter Maydell wrote:
On 25 August 2011 14:22, Avi Kivity<address@hidden>  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.




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