diff options
| author | Mathieu Desnoyers <[email protected]> | 2022-01-24 12:12:44 -0500 |
|---|---|---|
| committer | Peter Zijlstra <[email protected]> | 2022-02-02 13:11:35 +0100 |
| commit | 886ddfba933f5ce9d76c278165d834d114ba4ffc (patch) | |
| tree | 4394df10c80209533aa627deacd27d2e23433750 /tools/testing/selftests/rseq/rseq-ppc-thread-pointer.h | |
| parent | e546cd48ccc456074ddb8920732aef4af65d7ca7 (diff) | |
selftests/rseq: Introduce thread pointer getters
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.
The toolchains do not implement accessing the thread pointer on all
architectures. Provide thread pointer getters for ppc and x86 which
lack (or lacked until recently) toolchain support.
Signed-off-by: Mathieu Desnoyers <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
Diffstat (limited to 'tools/testing/selftests/rseq/rseq-ppc-thread-pointer.h')
| -rw-r--r-- | tools/testing/selftests/rseq/rseq-ppc-thread-pointer.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/tools/testing/selftests/rseq/rseq-ppc-thread-pointer.h b/tools/testing/selftests/rseq/rseq-ppc-thread-pointer.h new file mode 100644 index 000000000000..263eee84fb76 --- /dev/null +++ b/tools/testing/selftests/rseq/rseq-ppc-thread-pointer.h @@ -0,0 +1,30 @@ +/* SPDX-License-Identifier: LGPL-2.1-only OR MIT */ +/* + * rseq-ppc-thread-pointer.h + * + * (C) Copyright 2021 - Mathieu Desnoyers <[email protected]> + */ + +#ifndef _RSEQ_PPC_THREAD_POINTER +#define _RSEQ_PPC_THREAD_POINTER + +#ifdef __cplusplus +extern "C" { +#endif + +static inline void *rseq_thread_pointer(void) +{ +#ifdef __powerpc64__ + register void *__result asm ("r13"); +#else + register void *__result asm ("r2"); +#endif + asm ("" : "=r" (__result)); + return __result; +} + +#ifdef __cplusplus +} +#endif + +#endif |