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e49d1c413d
commit 886ddfba93 upstream.
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 <mathieu.desnoyers@efficios.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20220124171253.22072-7-mathieu.desnoyers@efficios.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
31 lines
517 B
C
31 lines
517 B
C
/* SPDX-License-Identifier: LGPL-2.1-only OR MIT */
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/*
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* rseq-ppc-thread-pointer.h
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*
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* (C) Copyright 2021 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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*/
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#ifndef _RSEQ_PPC_THREAD_POINTER
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#define _RSEQ_PPC_THREAD_POINTER
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#ifdef __cplusplus
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extern "C" {
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#endif
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static inline void *rseq_thread_pointer(void)
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{
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#ifdef __powerpc64__
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register void *__result asm ("r13");
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#else
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register void *__result asm ("r2");
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#endif
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asm ("" : "=r" (__result));
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return __result;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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