/* 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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