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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The 06/29/2022 12:44, Mark Brown wrote: > On Wed, Jun 29, 2022 at 11:01:43AM +0100, Szabolcs Nagy wrote: > > > the reason i slightly preferred AT_HWCAP3 was that AT_HWCAP > > is a bit special in ld.so: library lookups can depend on a > > glibc internal 64bit "hwcap" value that is historically > > AT_HWCAP but since that does not use all bits, some targets > > reused the top bits for high level platform abis which we > > may want to do on aarch64 too. it should be possible to make > > "hwcap" separate from AT_HWCAP (i.e. the bottom 32bits of > > "hwcap" just happens to come from AT_HWCAP but the top is > > defined by glibc), but that would be awkward to do in the > > ld.so code if AT_HWCAP started using the top bits too. > > (i think we cannot change the "hwcap" bits once they are > > allocated because they are in the ld.so.cache file.) > > So when you were saying that bits 62 and 63 were reserved it's actually > potentially all the top 32 bits but only in plain AT_HWCAP? > currently only bits 62 and 63 are reserved and only in plain AT_HWCAP. and yes it might be useful to reserve all top 32bits of AT_HWCAP. (for glibc internal reasons those are easy to use for ld.so extensions). _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel