1/* $NetBSD: lwp_private.h,v 1.1 2024/11/30 01:04:13 christos Exp $ */
2
3/*-
4 * Copyright (c) 2001 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.
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 _POWERPC_LWP_PRIVATE_H_
33#define _POWERPC_LWP_PRIVATE_H_
34
35#include <sys/cdefs.h>
36#include <sys/tls.h>
37
38#include <lwp.h>
39
40/*
41 * On PowerPC, since displacements are signed 16-bit values, the TCB Pointer
42 * is biased by 0x7000 + sizeof(tcb) so that first thread datum can be
43 * addressed by -28672 thereby leaving 60KB available for use as thread data.
44 */
45#define TLS_TP_OFFSET 0x7000
46#define TLS_DTV_OFFSET 0x8000
47__CTASSERT(TLS_TP_OFFSET + sizeof(struct tls_tcb) < 0x8000);
48
49__BEGIN_DECLS
50
51static __inline void *
52__lwp_gettcb_fast(void)
53{
54 void *__tcb;
55
56 __asm __volatile(
57 "addi %[__tcb],%%r2,%[__offset]"
58 : [__tcb] "=r" (__tcb)
59 : [__offset] "n" (-(TLS_TP_OFFSET + sizeof(struct tls_tcb))));
60
61 return __tcb;
62}
63
64static __inline void
65__lwp_settcb(void *__tcb)
66{
67 __tcb = (uint8_t *)__tcb + TLS_TP_OFFSET + sizeof(struct tls_tcb);
68
69 __asm __volatile(
70 "mr %%r2,%[__tcb]"
71 :
72 : [__tcb] "r" (__tcb));
73
74 _lwp_setprivate(__tcb);
75}
76
77__END_DECLS
78
79#endif /* !_POWERPC_LWP_PRIVATE_H_ */