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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
41 lines
687 B
C
41 lines
687 B
C
/* SPDX-License-Identifier: LGPL-2.1-only OR MIT */
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/*
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* rseq-x86-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_X86_THREAD_POINTER
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#define _RSEQ_X86_THREAD_POINTER
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#include <features.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if __GNUC_PREREQ (11, 1)
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static inline void *rseq_thread_pointer(void)
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{
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return __builtin_thread_pointer();
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}
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#else
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static inline void *rseq_thread_pointer(void)
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{
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void *__result;
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# ifdef __x86_64__
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__asm__ ("mov %%fs:0, %0" : "=r" (__result));
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# else
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__asm__ ("mov %%gs:0, %0" : "=r" (__result));
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# endif
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return __result;
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}
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#endif /* !GCC 11 */
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#ifdef __cplusplus
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}
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#endif
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#endif
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