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
43static __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
59static __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_ */