[PATCH 3/4] powerpc: Runtime selection between sc and scv for syscalls

[Matheus Castanho]

Gentle ping.

On 11/23/20 3:00 PM, Matheus Castanho via Libc-alpha wrote:
> Hi Florian,
> 
> On 11/19/20 5:35 PM, Florian Weimer wrote:
>> * Matheus Castanho:
>>
>>> That should work for shared libc, but in the static case we may also
>>> hit the same problem: trying to access the TLS to read hwcap2 before
>>> it has been initialized, but this time in csu/libc-tls.c
>>
>> Ahh.
>>
>>> Is there a way to also check if we are in the static startup code at
>>> compile time? If not, I'm afraid I'll have to keep the check for the
>>> thread pointer.
>>
>> Is the thread pointer in a regular register?  Then you could install a
>> fake TCB early on that has a zero bit in the right place.
>>
>> The other option would be to always use the old interface for !SHARED.
>> Just saying. 8-)
>>
> 
> I believe adding the fake TCB is a bit out of the scope of this patch, and I'd
> also prefer to keep the same behavior for both static and shared libcs, so we
> avoid surprises in the future.
> 
> Do you see this as a blocker for merging this patch?

Florian, any thoughts?

Thanks,
Matheus Castanho