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selftests/rseq: Introduce thread pointer getters

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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
This commit is contained in:
Mathieu Desnoyers
2022-01-24 12:12:44 -05:00
committed by Peter Zijlstra
parent e546cd48cc
commit 886ddfba93
4 changed files with 114 additions and 0 deletions
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19
tools/testing/selftests/rseq/rseq-thread-pointer.h Normal file
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/* SPDX-License-Identifier: LGPL-2.1-only OR MIT */
/*
* rseq-thread-pointer.h
*
* (C) Copyright 2021 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*/
#ifndef _RSEQ_THREAD_POINTER
#define _RSEQ_THREAD_POINTER
#if defined(__x86_64__) || defined(__i386__)
#include "rseq-x86-thread-pointer.h"
#elif defined(__PPC__)
#include "rseq-ppc-thread-pointer.h"
#else
#include "rseq-generic-thread-pointer.h"
#endif
#endif