Re: [PATCH v2 resend 1/5] ARM: add support for AT_HWCAP2 ELF auxv entry

[Ard Biesheuvel]

On 17 January 2014 16:07, Will Deacon <will.deacon@xxxxxxx> wrote:
> Hi Ard,
>
> On Fri, Jan 17, 2014 at 09:23:07AM +0000, Ard Biesheuvel wrote:
>> This enables AT_HWCAP2 for ARM. The generic support for this
>> new ELF auxv entry was added in commit 2171364d1a9 (powerpc:
>> Add HWCAP2 aux entry)
>
> Does this require a corresponding change in libc so that the entry is
> actually used by the dynamic linker?
>

The auxv entry itself is already wired up [this includes getauxval()]

https://sourceware.org/git/?p=glibc.git;a=commit;h=1ae8bfe07c1a

The only thing that is lacking is a way to hook up ifunc relocation,
as the current prototype passes a single 32-bit quantity.
So either we change the prototype to (hwcap, hwcap2) or we need to
rely on getauxval() in ifunc selectors if they need to inspect hwcap2

-- 
Ard.
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