[valgrind] [Bug 431157] PPC_FEATURE2_SCV needs to be masked in AT_HWCAP2

[Mark Wielaard]

https://bugs.kde.org/show_bug.cgi?id=431157

--- Comment #5 from Mark Wielaard <m...@klomp.org> ---
That looks plausible:

+            /* Mask unrecognized HWCAP bits.  Only keep the bits that have
+             * been mentioned above.
+             */
+            auxv->u.a_val &= 0xfec40000ULL;

So if I understand correctly that means (of those not mentioned above)

explicitly filtered out:

PPC_FEATURE2_HTM_NOSC 0x01000000
PPC_FEATURE2_DARN     0x00200000
PPC_FEATURE2_SCV      0x00100000

explicitly included:

PPC_FEATURE2_ARCH_3_1 0x00040000

It might make sense to have defines of these in include/vki/vki-ppc64-linux.h
as VKI_PPC_FEATURE2_* so that we can more easily see which ones we
include/exclude.

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