1/* $NetBSD: lwp_private.h,v 1.1 2024/11/30 01:04:13 christos Exp $ */
2
3/*-
4 * Copyright (c) 2014 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Matt Thomas of 3am Software Foundry.
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#ifndef _RISCV_LWP_PRIVATE_H_
32#define _RISCV_LWP_PRIVATE_H_
33
34#include <sys/cdefs.h>
35#include <sys/tls.h>
36
37/*
38 * On RISCV, since displacements are signed 12-bit values, the TCB Pointer
39 * is biased by sizeof(tcb) so that first thread datum can be addressed by
40 * -sizeof(tcb).
41 */
42
43#define TLS_TP_OFFSET 0x0
44#define TLS_TCB_ALIGN 16
45#define TLS_DTV_OFFSET 0x800
46__CTASSERT(TLS_TP_OFFSET + sizeof(struct tls_tcb) < 0x800);
47
48__BEGIN_DECLS
49
50static __inline void *
51__lwp_getprivate_fast(void)
52{
53 void *__tp;
54 __asm("mv %0, tp" : "=r"(__tp));
55 return __tp;
56}
57
58static __inline void *
59__lwp_gettcb_fast(void)
60{
61 void *__tcb;
62
63 __asm __volatile(
64 "addi %[__tcb], tp, %[__offset]"
65 : [__tcb] "=r" (__tcb)
66 : [__offset] "n" (-(TLS_TP_OFFSET + sizeof(struct tls_tcb))));
67
68 return __tcb;
69}
70
71static __inline void
72__lwp_settcb(void *__tcb)
73{
74 __asm __volatile(
75 "addi tp, %[__tcb], %[__offset]"
76 :
77 : [__tcb] "r" (__tcb),
78 [__offset] "n" (TLS_TP_OFFSET + sizeof(struct tls_tcb)));
79}
80
81__END_DECLS
82
83#endif /* !_RISCV_LWP_PRIVATE_H_ */