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nptl: Move the rseq area to the 'extra TLS' block

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Move the rseq area to the newly added 'extra TLS' block, this is the
last step in adding support for the rseq extended ABI. The size of the
rseq area is now dynamic and depends on the rseq features reported by
the kernel through the elf auxiliary vector. This will allow
applications to use rseq features past the 32 bytes of the original rseq
ABI as they become available in future kernels.

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Reviewed-by: Florian Weimer <fweimer@redhat.com>
This commit is contained in:
Michael Jeanson
2024-07-10 15:48:49 -04:00
parent 494d65129e
commit 93d0bfbe8f
12 changed files with 207 additions and 59 deletions
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3
sysdeps/unix/sysv/linux/sched_getcpu.c
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@@ -19,6 +19,7 @@
#include <sched.h>
#include <sysdep.h>
#include <sysdep-vdso.h>
#include <rseq-internal.h>
static int
vsyscall_sched_getcpu (void)
@@ -36,6 +37,6 @@ vsyscall_sched_getcpu (void)
int
sched_getcpu (void)
{
int cpu_id = THREAD_GETMEM_VOLATILE (THREAD_SELF, rseq_area.cpu_id);
int cpu_id = RSEQ_GETMEM_ONCE (cpu_id);
return __glibc_likely (cpu_id >= 0) ? cpu_id : vsyscall_sched_getcpu ();
}