1 /* $NetBSD: lwp_private.h,v 1.1 2024/11/30 01:04:07 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2001, 2002 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Klaus Klein and by Jason R. Thorpe of Wasabi Systems, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _ARM_LWP_PRIVATE_H_ 33 #define _ARM_LWP_PRIVATE_H_ 34 35 #include <sys/cdefs.h> 36 #include <sys/tls.h> 37 38 #include <lwp.h> 39 40 #if defined(__aarch64__) 41 42 __BEGIN_DECLS 43 static __inline void * 44 __lwp_getprivate_fast(void) 45 { 46 void *__tpidr; 47 __asm __volatile("mrs\t%0, tpidr_el0" : "=r"(__tpidr)); 48 return __tpidr; 49 } 50 __END_DECLS 51 52 #elif defined(__arm__) 53 54 #if defined(__thumb__) && !defined(_ARM_ARCH_T2) 55 #include <arm/eabi.h> 56 #endif 57 58 __BEGIN_DECLS 59 static __inline void * 60 __lwp_getprivate_fast(void) 61 { 62 #if !defined(__thumb__) || defined(_ARM_ARCH_T2) 63 void *rv; 64 __asm("mrc p15, 0, %0, c13, c0, 3" : "=r"(rv)); 65 if (__predict_true(rv)) 66 return rv; 67 /* 68 * Some ARM cores are broken and don't raise an undefined fault when an 69 * unrecogized mrc instruction is encountered, but just return zero. 70 * To do deal with that, if we get a zero we (re-)fetch the value using 71 * syscall. 72 */ 73 return _lwp_getprivate(); 74 #else 75 return __aeabi_read_tp(); 76 #endif /* !__thumb__ || _ARM_ARCH_T2 */ 77 } 78 __END_DECLS 79 #endif 80 81 #endif /* !_ARM_LWP_PRIVATE_H_ */ 82