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nptl: Add public rseq symbols and <sys/rseq.h>

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The relationship between the thread pointer and the rseq area
is made explicit.  The constant offset can be used by JIT compilers
to optimize rseq access (e.g., for really fast sched_getcpu).

Extensibility is provided through __rseq_size and __rseq_flags.
(In the future, the kernel could request a different rseq size
via the auxiliary vector.)

Co-Authored-By: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
This commit is contained in:
Florian Weimer
2021-12-09 09:49:32 +01:00
parent e3e589829d
commit c901c3e764
38 changed files with 237 additions and 5 deletions
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5
sysdeps/unix/sysv/linux/Versions
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@ -316,6 +316,11 @@ librt {
}
ld {
GLIBC_2.35 {
__rseq_flags;
__rseq_offset;
__rseq_size;
}
GLIBC_PRIVATE {
__nptl_change_stack_perm;
}