Re: [Qemu-devel] [PATCH 0/2] vdso for x86_64-linux-user

[Richard Henderson <rth@twiddle.net>]

On 07/24/2013 06:39 AM, Peter Maydell wrote:
> On 24 July 2013 17:34, Richard Henderson <rth@twiddle.net> wrote:
>> On 07/23/2013 11:15 AM, Peter Maydell wrote:
>>> On 23 July 2013 21:27, Richard Henderson <rth@twiddle.net> wrote:
>>>> This is a refresh of a patch I wrote in 2010, and have re-posted every
>>>> 6 months thereafter.  To my knowledge, it has never been reviewed.
>>>>
>>>> It supplies a replacement for the required x86-64 vdso.  Anyone trying
>>>> to emulate x86_64-linux on a host other than same will quickly run into
>>>> the lack of a gettimeofday syscall, which glibc assumes is always
>>>> provided by the vdso.
>>>
>>> Do we really need to mess with building an x86 shared object
>>> and pulling it in, rather than the kind of ad-hoc way we
>>> handle the ARM commpage?
>>
>> Isn't the arm ad-hoc really the much larger and uglier hack?
> 
> Maaaybe, but it doesn't require a cross-compiler :-)

The 7k binary is checked in to the repository, so a cross-compiler
(or host compiler for x86_64, which is easier to come by) would
only be needed when the source changes.  ;-)


r~