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arm64: compat: Check for AArch32 state

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Make sure we have AArch32 state available for running COMPAT
binaries and also for switching the personality to PER_LINUX32.

Signed-off-by: Yury Norov <ynorov@caviumnetworks.com>
[ Added cap bit, checks for HWCAP, personality ]
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Tested-by: Yury Norov <ynorov@caviumnetworks.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Suzuki K Poulose
2016-04-18 10:28:37 +01:00
committed by Will Deacon
parent 042446a31e
commit 643d703d2d
3 changed files with 17 additions and 3 deletions
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7
arch/arm64/kernel/cpufeature.c
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@@ -987,7 +987,8 @@ void verify_local_cpu_capabilities(void)
verify_local_cpu_features(arm64_features);
verify_local_elf_hwcaps(arm64_elf_hwcaps);
verify_local_elf_hwcaps(compat_elf_hwcaps);
if (system_supports_32bit_el0())
verify_local_elf_hwcaps(compat_elf_hwcaps);
}
static void __init setup_feature_capabilities(void)
@@ -1004,7 +1005,9 @@ void __init setup_cpu_features(void)
/* Set the CPU feature capabilies */
setup_feature_capabilities();
setup_elf_hwcaps(arm64_elf_hwcaps);
setup_elf_hwcaps(compat_elf_hwcaps);
if (system_supports_32bit_el0())
setup_elf_hwcaps(compat_elf_hwcaps);
/* Advertise that we have computed the system capabilities */
set_sys_caps_initialised();