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2021-06-11arm64: Allow mismatched 32-bit EL0 supportWill Deacon
When confronted with a mixture of CPUs, some of which support 32-bit applications and others which don't, we quite sensibly treat the system as 64-bit only for userspace and prevent execve() of 32-bit binaries. Unfortunately, some crazy folks have decided to build systems like this with the intention of running 32-bit applications, so relax our sanitisation logic to continue to advertise 32-bit support to userspace on these systems and track the real 32-bit capable cores in a cpumask instead. For now, the default behaviour remains but will be tied to a command-line option in a later patch. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Link: https://lore.kernel.org/r/20210608180313.11502-3-will@kernel.org Signed-off-by: Will Deacon <will@kernel.org>
2021-05-13arm64: tools: Add __ASM_CPUCAPS_H to the endif in cpucaps.hMark Brown
Anshuman suggested this. Suggested-by: Anshuman Khandual <anshuman.khandual@arm.com> Signed-off-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20210513151819.12526-1-broonie@kernel.org Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2021-05-10arm64: Generate cpucaps.hMark Brown
The arm64 code allocates an internal constant to every CPU feature it can detect, distinct from the public hwcap numbers we use to expose some features to userspace. Currently this is maintained manually which is an irritating source of conflicts when working on new features, to avoid this replace the header with a simple text file listing the names we've assigned and sort it to minimise conflicts. As part of doing this we also do the Kbuild hookup required to hook up an arch tools directory and to generate header files in there. This will result in a renumbering and reordering of the existing constants, since they are all internal only the values should not be important. The reordering will impact the order in which some steps in enumeration handle features but the algorithm is not intended to depend on this and I haven't seen any issues when testing. Due to the UAO cpucap having been removed in the past we end up with ARM64_NCAPS being 1 smaller than it was before. Signed-off-by: Mark Brown <broonie@kernel.org> Reviewed-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> Link: https://lore.kernel.org/r/20210428121231.11219-1-broonie@kernel.org Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>