IFUNC resolvers for non-function symbols

[Florian Weimer]

On 01/24/2017 02:55 PM, Szabolcs Nagy wrote:
> On 24/01/17 12:46, Florian Weimer wrote:
>> To which extent do we need to support IFUNC resolvers which are used by non-function relocations?
>>
>> For example, do we need to support copy relocations where the object address is determined by an IFUNC resolver?
>>
>> The x86-64 psABI, for example, does not seem to be very explicit what the expected scope of support is.
>
> the ifunc spec i know about
>
> https://sites.google.com/site/x32abi/documents
>
> says
>
> STT_GNU_IFUNC
>
>       This symbol type is the same as STT_FUNC except that it always
>       points to a function or piece of executable code which takes no
>       arguments and returns a function pointer. [..]
>
> this implies to me that ifunc resolver is not applicable to data.

But this bit applies to the address of the resolver, not the address 
returned from it.

Thanks,
Florian