1/* $OpenBSD: tcb.h,v 1.6 2019/07/02 20:42:45 kettenis Exp $ */
2
3/*
4 * Copyright (c) 2011 Philip Guenther <guenther@openbsd.org>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19#ifndef _MACHINE_TCB_H_
20#define _MACHINE_TCB_H_
21
22#ifdef _KERNEL
23
24#define TCB_GET(p) \
25 ((void *)trapframe(p)->fixreg[2])
26#define TCB_SET(p, addr) \
27 (trapframe(p)->fixreg[2] = (__register_t)(addr))
28
29#else /* _KERNEL */
30
31/* ELF TLS ABI calls for small TCB, with static TLS data after it */
32#define TLS_VARIANT 1
33
34/* powerpc offsets the TCB pointer 0x7000 bytes after the data */
35#define TCB_OFFSET 0x7000
36
37register void *__tcb __asm__ ("r2");
38#define TCB_GET() (__tcb)
39#define TCB_SET(tcb) ((__tcb) = (tcb))
40
41#endif /* _KERNEL */
42#endif /* _MACHINE_TCB_H_ */