[PATCH v3 7/8] aarch64: Add sysv specific enabling code for memory tagging
Richard Earnshaw
rearnsha@arm.com
Mon Nov 23 15:42:35 GMT 2020
Add various defines and stubs for enabling MTE on AArch64 sysv-like
systems such as Linux. The HWCAP feature bit is copied over in the
same way as other feature bits. Similarly we add a new wrapper header
for mman.h to define the PROT_MTE flag that can be used with mmap and
related functions.
We add a new field to struct cpu_features that can be used, for
example, to check whether or not certain ifunc'd routines should be
bound to MTE-safe versions.
Finally, if we detect that MTE should be enabled (ie via the glibc
tunable); we enable MTE during startup as required.
---
sysdeps/unix/sysv/linux/aarch64/bits/hwcap.h | 1 +
sysdeps/unix/sysv/linux/aarch64/bits/mman.h | 7 +++++
.../unix/sysv/linux/aarch64/cpu-features.c | 28 +++++++++++++++++++
.../unix/sysv/linux/aarch64/cpu-features.h | 1 +
4 files changed, 37 insertions(+)
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