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| author | Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | 2022-01-24 20:12:43 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-02-02 15:11:35 +0300 |
| commit | e546cd48ccc456074ddb8920732aef4af65d7ca7 (patch) | |
| tree | e9ca24ec796e1635c74982918b875776e19c5aee /tools/testing/selftests/rseq/rseq-x86-thread-pointer.h | |
| parent | 94b80a19ebfe347a01301d750040a61c38200e2b (diff) | |
| download | linux-e546cd48ccc456074ddb8920732aef4af65d7ca7.tar.xz | |
selftests/rseq: Introduce rseq_get_abi() helper
This is done in preparation for the selftest uplift to become compatible
with glibc-2.35.
glibc-2.35 exposes the rseq per-thread data in the TCB, accessible
at an offset from the thread pointer, rather than through an actual
Thread-Local Storage (TLS) variable, as the kernel selftests initially
expected.
Introduce a rseq_get_abi() helper, initially using the __rseq_abi
TLS variable, in preparation for changing this userspace ABI for one
which is compatible with glibc-2.35.
Note that the __rseq_abi TLS and glibc-2.35's ABI for per-thread data
cannot actively coexist in a process, because the kernel supports only
a single rseq registration per thread.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20220124171253.22072-6-mathieu.desnoyers@efficios.com
Diffstat (limited to 'tools/testing/selftests/rseq/rseq-x86-thread-pointer.h')
0 files changed, 0 insertions, 0 deletions