1169695Skan/* Copyright (C) 2005 Free Software Foundation, Inc.
2169695Skan   Contributed by Richard Henderson <rth@redhat.com>.
3169695Skan
4169695Skan   This file is part of the GNU OpenMP Library (libgomp).
5169695Skan
6169695Skan   Libgomp is free software; you can redistribute it and/or modify it
7169695Skan   under the terms of the GNU Lesser General Public License as published by
8169695Skan   the Free Software Foundation; either version 2.1 of the License, or
9169695Skan   (at your option) any later version.
10169695Skan
11169695Skan   Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
12169695Skan   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
13169695Skan   FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
14169695Skan   more details.
15169695Skan
16169695Skan   You should have received a copy of the GNU Lesser General Public License
17169695Skan   along with libgomp; see the file COPYING.LIB.  If not, write to the
18169695Skan   Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
19169695Skan   MA 02110-1301, USA.  */
20169695Skan
21169695Skan/* As a special exception, if you link this library with other files, some
22169695Skan   of which are compiled with GCC, to produce an executable, this library
23169695Skan   does not by itself cause the resulting executable to be covered by the
24169695Skan   GNU General Public License.  This exception does not however invalidate
25169695Skan   any other reasons why the executable file might be covered by the GNU
26169695Skan   General Public License.  */
27169695Skan
28169695Skan/* Provide target-specific access to the futex system call.  */
29169695Skan
30169695Skan#ifndef SYS_futex
31169695Skan#define SYS_futex               394
32169695Skan#endif
33169695Skan#define FUTEX_WAIT              0
34169695Skan#define FUTEX_WAKE              1
35169695Skan
36169695Skan
37169695Skanstatic inline void
38169695Skanfutex_wait (int *addr, int val)
39169695Skan{
40169695Skan  register long sc_0 __asm__("$0");
41169695Skan  register long sc_16 __asm__("$16");
42169695Skan  register long sc_17 __asm__("$17");
43169695Skan  register long sc_18 __asm__("$18");
44169695Skan  register long sc_19 __asm__("$19");
45169695Skan
46169695Skan  sc_0 = SYS_futex;
47169695Skan  sc_16 = (long) addr;
48169695Skan  sc_17 = FUTEX_WAIT;
49169695Skan  sc_18 = val;
50169695Skan  sc_19 = 0;
51169695Skan  __asm volatile ("callsys"
52169695Skan		  : "=r" (sc_0), "=r"(sc_19)
53169695Skan		  : "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18), "1"(sc_19)
54169695Skan		  : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8",
55169695Skan		    "$22", "$23", "$24", "$25", "$27", "$28", "memory");
56169695Skan}
57169695Skan
58169695Skanstatic inline void
59169695Skanfutex_wake (int *addr, int count)
60169695Skan{
61169695Skan  register long sc_0 __asm__("$0");
62169695Skan  register long sc_16 __asm__("$16");
63169695Skan  register long sc_17 __asm__("$17");
64169695Skan  register long sc_18 __asm__("$18");
65169695Skan  register long sc_19 __asm__("$19");
66169695Skan
67169695Skan  sc_0 = SYS_futex;
68169695Skan  sc_16 = (long) addr;
69169695Skan  sc_17 = FUTEX_WAKE;
70169695Skan  sc_18 = count;
71169695Skan  __asm volatile ("callsys"
72169695Skan		  : "=r" (sc_0), "=r"(sc_19)
73169695Skan		  : "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18)
74169695Skan		  : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8",
75169695Skan		    "$22", "$23", "$24", "$25", "$27", "$28", "memory");
76169695Skan}
77