1 /* $OpenBSD: tcb.h,v 1.2 2016/05/15 23:37:42 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 void *tcb_get(struct proc *_p);
25 void tcb_set(struct proc *_p, void *_newtcb);
26
27 #define TCB_GET(p) tcb_get(p)
28 #define TCB_SET(p, addr) tcb_set(p, 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 static inline void *
__alpha_get_tcb(void)36 __alpha_get_tcb(void)
37 {
38 register void *__tmp __asm__("$0");
39
40 __asm__ ("call_pal %1 # PAL_rdunique"
41 : "=r" (__tmp)
42 : "i" (0x009e /* PAL_rdunique */));
43 return __tmp;
44 }
45 #define TCB_GET() __alpha_get_tcb()
46
47 static inline void
__alpha_set_tcb(void * __val)48 __alpha_set_tcb(void *__val)
49 {
50 register void *__tmp __asm__("$16") = __val;
51
52 __asm__ volatile ("call_pal %1 # PAL_wrunique"
53 : "=r" (__tmp)
54 : "i" (0x009f /* PAL_wrunique */), "0" (__tmp));
55 }
56 #define TCB_SET(addr) __alpha_set_tcb(addr)
57
58 #endif /* _KERNEL */
59
60 #endif /* _MACHINE_TCB_H_ */
61