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      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