1/*	$OpenBSD: tcb.h,v 1.2 2016/05/18 20:21:13 guenther 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/*
25 * In userspace, register gbr contains the address of the thread's TCB
26 */
27#define TCB_GET(p)		((void *)(p)->p_md.md_regs->tf_gbr)
28#define TCB_SET(p, addr)	((p)->p_md.md_regs->tf_gbr = (int)(addr))
29
30#else /* _KERNEL */
31
32/* ELF TLS ABI calls for small TCB, with static TLS data after it */
33#define TLS_VARIANT	1
34
35/* Get a pointer to the TCB itself */
36static inline void *
37__sh_get_tcb(void)
38{
39	void *__val;
40	__asm__ ("stc gbr, %0" : "=r" (__val));
41	return __val;
42}
43#define TCB_GET()	__sh_get_tcb()
44#define TCB_SET(tcb)	__asm__ ("ldc %0, gbr" : : "r" (tcb));
45
46#endif /* _KERNEL */
47
48#endif /* _MACHINE_TCB_H_ */
49