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Re: glibc clears AT_HWCAP and set only HW_CAP_X86_64 (0x2)
On Fri, Oct 18, 2019 at 2:24 PM Carlos O'Donell <email@example.com> wrote:
> On 10/17/19 5:06 PM, H.J. Lu wrote:
> > dl_hwcap is used to load DSO optimized for a platform. On i386, we use
> > AT_HWCAP passed from kernel. On x86-64, we use a different approach
> > since AT_HWCAP passed from kernel isn't very useful:
> The use of dl_hwcap to load DSOs is orthogonal to what getauxval() returns.
> They need not be the same.
> The question I have is: Why isn't AT_HWCAP returned by getauxval() for x86_64?
> We could store AT_HWCAP into dl_hwcap_real, and return that in getauxval()
This should work.
> while still using the *processed* AT_HWCAP in dl_hwcap.
> It seems confusing to return an altered AT_AUXVAL from getauxval()?
> What do you think?
I have no strong opinion on this.