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From: Alexander Graf <alex@csgraf.de>
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Subject: Re: [Qemu-devel] [PATCH] Make the ELF loader aware of backwards
	compatibility
Date: Thu, 12 Mar 2009 00:32:24 +0100
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To: qemu-devel@nongnu.org
Cc: Blue Swirl <blauwirbel@gmail.com>


On 28.02.2009, at 16:30, Blue Swirl wrote:

> On 2/28/09, Alexander Graf <agraf@suse.de> wrote:
>> Most 64 bit architectures I'm aware of support running 32 bit code
>> of the same architecture as well.
>
> For Sparc64 this is only true for userland, kernel level code is not
> compatible at all. Sparc64 kernel can run Sparc64 and Sparc32
> binaries, but a Sparc32 kernel will crash on Sparc64.
>
>>  /* Load a 32 bit BIOS also on 64 bit machines */
>> -#if defined (TARGET_PPC64) && defined(CONFIG_USER_ONLY)
>> +#if defined (TARGET_PPC64)
>>  #define ELF_MACHINE     EM_PPC64
>>  #else
>>  #define ELF_MACHINE     EM_PPC
>
> The comment should be removed with the hack.

I agree.

Any functional issues with this patch? -kernel for ppc64 still doesn't  
work with current SVN :-).

Alex