1*4882a593Smuzhiyun /* SPDX-License-Identifier: LGPL-2.1-only OR MIT */ 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * rseq-x86-thread-pointer.h 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * (C) Copyright 2021 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> 6*4882a593Smuzhiyun */ 7*4882a593Smuzhiyun 8*4882a593Smuzhiyun #ifndef _RSEQ_X86_THREAD_POINTER 9*4882a593Smuzhiyun #define _RSEQ_X86_THREAD_POINTER 10*4882a593Smuzhiyun 11*4882a593Smuzhiyun #include <features.h> 12*4882a593Smuzhiyun 13*4882a593Smuzhiyun #ifdef __cplusplus 14*4882a593Smuzhiyun extern "C" { 15*4882a593Smuzhiyun #endif 16*4882a593Smuzhiyun 17*4882a593Smuzhiyun #if __GNUC_PREREQ (11, 1) rseq_thread_pointer(void)18*4882a593Smuzhiyunstatic inline void *rseq_thread_pointer(void) 19*4882a593Smuzhiyun { 20*4882a593Smuzhiyun return __builtin_thread_pointer(); 21*4882a593Smuzhiyun } 22*4882a593Smuzhiyun #else 23*4882a593Smuzhiyun static inline void *rseq_thread_pointer(void) 24*4882a593Smuzhiyun { 25*4882a593Smuzhiyun void *__result; 26*4882a593Smuzhiyun 27*4882a593Smuzhiyun # ifdef __x86_64__ 28*4882a593Smuzhiyun __asm__ ("mov %%fs:0, %0" : "=r" (__result)); 29*4882a593Smuzhiyun # else 30*4882a593Smuzhiyun __asm__ ("mov %%gs:0, %0" : "=r" (__result)); 31*4882a593Smuzhiyun # endif 32*4882a593Smuzhiyun return __result; 33*4882a593Smuzhiyun } 34*4882a593Smuzhiyun #endif /* !GCC 11 */ 35*4882a593Smuzhiyun 36*4882a593Smuzhiyun #ifdef __cplusplus 37*4882a593Smuzhiyun } 38*4882a593Smuzhiyun #endif 39*4882a593Smuzhiyun 40*4882a593Smuzhiyun #endif 41