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Re: [PATCH] [BZ #21391] x86: Set dl_platform and dl_hwcap from CPU features
On Fri, Apr 28, 2017 at 7:45 AM, Florian Weimer <fweimer@redhat.com> wrote:
> On 04/28/2017 04:44 PM, H.J. Lu wrote:
>>
>> Any other comments?
>
>
> I don't have any further comments.
>
> Except maybe this: Why isn't this is in the kernel, like for the other
> architectures?
>
On x86, CPUID is available to both kernel and user space. Kernel
sets AT_PLATFORM and AT_HWCAP from CPUID. But it isn't flexible
for setting dynamic linker search path. There is no support for platform
nor hardware capability in dynamic linker search path for x86-64.
AT_HWCAP only provides a small subset of features from CPUID. My
patch sets dynamic linker search path in user space from CPUID. It
works for both i386 and x86-64.
--
H.J.