Messages in this thread | | | From | Yury Norov <> | Subject | [PATCH v2 0/2] arm64: introduce run-time detection of aarch32 support | Date | Wed, 2 Sep 2015 17:00:36 +0300 |
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This is needed to avoid loading aarch32 binaries if COMPAT is enabled, but aarch32 is not supported by specific platform.
First patch fixes hidden header dependencies in arch/arm64/include/asm/cpufeature.h. It's not related to the issue, but helps to avoid build failure that happens if one applies second patch only.
Second patch adds run-time detection of aarch32 support, and rejects kernel to load such binaries, if not supported.
Tested on ThunderX.
V2: - add missing <linux/compiler.h> for the __attribute_const__ on cpuid_feature_extract_field; - move cpu_feature macro under the __ASSEMBLY__ guard. - check that all CPUs support AArch32, not the current only, the same way as for endianness support.
Signed-off-by: Yury Norov <ynorov@caviumnetworks.com>
Yury Norov (2): arm64: cpufeature.h: resolve hidden header dependencies arm64: don't load 32-bit binaries if platform has no aarch32_el0
arch/arm64/include/asm/cpufeature.h | 10 +++++++++- arch/arm64/include/asm/cputype.h | 8 ++++++++ arch/arm64/include/asm/elf.h | 6 ++++-- arch/arm64/kernel/cpuinfo.c | 12 ++++++++++++ 4 files changed, 33 insertions(+), 3 deletions(-)
-- 2.1.4
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