xref: /openbsd/sys/arch/sh/include/tcb.h (revision 264ca280)
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 */
36 static 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