1182219Sjkim/* Copyright (C) 2005 Free Software Foundation, Inc.
2182393Sjkim   Contributed by Richard Henderson <rth@redhat.com>.
3182219Sjkim
4182219Sjkim   This file is part of the GNU OpenMP Library (libgomp).
5182219Sjkim
6182219Sjkim   Libgomp is free software; you can redistribute it and/or modify it
7182219Sjkim   under the terms of the GNU Lesser General Public License as published by
8182219Sjkim   the Free Software Foundation; either version 2.1 of the License, or
9182393Sjkim   (at your option) any later version.
10199604Sjkim
11182219Sjkim   Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
12182219Sjkim   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
13182219Sjkim   FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
14182219Sjkim   more details.
15182219Sjkim
16182219Sjkim   You should have received a copy of the GNU Lesser General Public License
17182219Sjkim   along with libgomp; see the file COPYING.LIB.  If not, write to the
18182219Sjkim   Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
19182219Sjkim   MA 02110-1301, USA.  */
20182219Sjkim
21182219Sjkim/* As a special exception, if you link this library with other files, some
22182219Sjkim   of which are compiled with GCC, to produce an executable, this library
23182219Sjkim   does not by itself cause the resulting executable to be covered by the
24182219Sjkim   GNU General Public License.  This exception does not however invalidate
25182219Sjkim   any other reasons why the executable file might be covered by the GNU
26182219Sjkim   General Public License.  */
27182219Sjkim
28182219Sjkim/* Provide target-specific access to the futex system call.  */
29182219Sjkim
30182219Sjkim#include <sys/syscall.h>
31182393Sjkim#define FUTEX_WAIT	0
32199604Sjkim#define FUTEX_WAKE	1
33199604Sjkim
34199604Sjkimstatic inline void
35182219Sjkimsys_futex0 (int *addr, int op, int val)
36182219Sjkim{
37  register long int r0  __asm__ ("r0");
38  register long int r3  __asm__ ("r3");
39  register long int r4  __asm__ ("r4");
40  register long int r5  __asm__ ("r5");
41  register long int r6  __asm__ ("r6");
42
43  r0 = SYS_futex;
44  r3 = (long) addr;
45  r4 = op;
46  r5 = val;
47  r6 = 0;
48
49  /* ??? The powerpc64 sysdep.h file clobbers ctr; the powerpc32 sysdep.h
50     doesn't.  It doesn't much matter for us.  In the interest of unity,
51     go ahead and clobber it always.  */
52
53  __asm volatile ("sc"
54		  : "=r"(r0), "=r"(r3), "=r"(r4), "=r"(r5), "=r"(r6)
55		  : "r"(r0), "r"(r3), "r"(r4), "r"(r5), "r"(r6)
56		  : "r7", "r8", "r9", "r10", "r11", "r12",
57		    "cr0", "ctr", "memory");
58}
59
60static inline void
61futex_wait (int *addr, int val)
62{
63  sys_futex0 (addr, FUTEX_WAIT, val);
64}
65
66static inline void
67futex_wake (int *addr, int count)
68{
69  sys_futex0 (addr, FUTEX_WAKE, count);
70}
71