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| author | Tejas Belagod <Tejas.Belagod@arm.com> | 2022-06-27 18:00:50 +0000 |
|---|---|---|
| committer | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2022-06-30 14:01:08 +0100 |
| commit | e9dd3682963a7038d699430e3ece68045b6caafc (patch) | |
| tree | 6291bcded33b627d881c13aa161cd4329b12b4b6 /sysdeps/unix/sysv/linux | |
| parent | 71d87d85bf54f6522813aec97c19bdd24997341e (diff) | |
| download | glibc-e9dd3682963a7038d699430e3ece68045b6caafc.tar glibc-e9dd3682963a7038d699430e3ece68045b6caafc.tar.gz glibc-e9dd3682963a7038d699430e3ece68045b6caafc.tar.bz2 glibc-e9dd3682963a7038d699430e3ece68045b6caafc.zip | |
AArch64: Add asymmetric faulting mode for tag violations in mem.tagging tunable
The new asymmetric mode is available when HWCAP2_MTE3 is set (support is
available), bit2 is set in the tunable (user request per application),
and the system is configured such that the asymmetric mode is preferred over
sync or async (per-cpu system-wide setting).
Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
Diffstat (limited to 'sysdeps/unix/sysv/linux')
| -rw-r--r-- | sysdeps/unix/sysv/linux/aarch64/cpu-features.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/sysdeps/unix/sysv/linux/aarch64/cpu-features.c b/sysdeps/unix/sysv/linux/aarch64/cpu-features.c index 41dda8d003..d14c0f4e1f 100644 --- a/sysdeps/unix/sysv/linux/aarch64/cpu-features.c +++ b/sysdeps/unix/sysv/linux/aarch64/cpu-features.c @@ -108,7 +108,13 @@ init_cpu_features (struct cpu_features *cpu_features) TUNABLE_SET (glibc, mem, tagging, cpu_features->mte_state); # endif - if (cpu_features->mte_state & 2) + if (cpu_features->mte_state & 4) + /* Enable choosing system-preferred faulting mode. */ + __prctl (PR_SET_TAGGED_ADDR_CTRL, + (PR_TAGGED_ADDR_ENABLE | PR_MTE_TCF_SYNC | PR_MTE_TCF_ASYNC + | MTE_ALLOWED_TAGS), + 0, 0, 0); + else if (cpu_features->mte_state & 2) __prctl (PR_SET_TAGGED_ADDR_CTRL, (PR_TAGGED_ADDR_ENABLE | PR_MTE_TCF_SYNC | MTE_ALLOWED_TAGS), 0, 0, 0); |