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/* SPDX-License-Identifier: LGPL-2.1-only OR MIT */
/*
* rseq-x86-thread-pointer.h
*
* (C) Copyright 2021 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*/
#ifndef _RSEQ_X86_THREAD_POINTER
#define _RSEQ_X86_THREAD_POINTER
#include <features.h>
#ifdef __cplusplus
extern "C" {
#endif
#if __GNUC_PREREQ (11, 1)
static inline void *rseq_thread_pointer(void)
{
return __builtin_thread_pointer();
}
#else
static inline void *rseq_thread_pointer(void)
{
void *__result;
# ifdef __x86_64__
__asm__ ("mov %%fs:0, %0" : "=r" (__result));
# else
__asm__ ("mov %%gs:0, %0" : "=r" (__result));
# endif
return __result;
}
#endif /* !GCC 11 */
#ifdef __cplusplus
}
#endif
#endif