1// Low-level functions for atomic operations: sh version  -*- C++ -*-
2
3// Copyright (C) 1999, 2001, 2002, 2003, 2004, 2005, 2006, 2009
4// Free Software Foundation, Inc.
5//
6// This file is part of the GNU ISO C++ Library.  This library is free
7// software; you can redistribute it and/or modify it under the
8// terms of the GNU General Public License as published by the
9// Free Software Foundation; either version 3, or (at your option)
10// any later version.
11
12// This library is distributed in the hope that it will be useful,
13// but WITHOUT ANY WARRANTY; without even the implied warranty of
14// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15// GNU General Public License for more details.
16
17// Under Section 7 of GPL version 3, you are granted additional
18// permissions described in the GCC Runtime Library Exception, version
19// 3.1, as published by the Free Software Foundation.
20
21// You should have received a copy of the GNU General Public License and
22// a copy of the GCC Runtime Library Exception along with this program;
23// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
24// <http://www.gnu.org/licenses/>.
25
26#ifdef __SH4A__
27
28#include <ext/atomicity.h>
29
30_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
31
32  typedef int _Atomic_word;
33
34  _Atomic_word
35  __attribute__ ((__unused__))
36  __exchange_and_add (volatile _Atomic_word* __mem, int __val) throw ()
37  {
38    _Atomic_word __result;
39
40    __asm__ __volatile__
41      ("0:\n"
42       "\tmovli.l\t@%2,r0\n"
43       "\tmov\tr0,%1\n"
44       "\tadd\t%3,r0\n"
45       "\tmovco.l\tr0,@%2\n"
46       "\tbf\t0b"
47       : "+m" (*__mem), "=&r" (__result)
48       : "r" (__mem), "rI08" (__val)
49       : "r0");
50
51    return __result;
52  }
53
54
55  void
56  __attribute__ ((__unused__))
57  __atomic_add (volatile _Atomic_word* __mem, int __val) throw ()
58  {
59    asm("0:\n"
60	"\tmovli.l\t@%1,r0\n"
61	"\tadd\t%2,r0\n"
62	"\tmovco.l\tr0,@%1\n"
63	"\tbf\t0b"
64	: "+m" (*__mem)
65	: "r" (__mem), "rI08" (__val)
66	: "r0");
67  }
68
69_GLIBCXX_END_NAMESPACE
70
71#else /* !__SH4A__ */
72
73/* This is generic/atomicity.h */
74
75#include <ext/atomicity.h>
76#include <ext/concurrence.h>
77
78namespace
79{
80  __gnu_cxx::__mutex atomic_mutex;
81} // anonymous namespace
82
83_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
84
85  _Atomic_word
86  __attribute__ ((__unused__))
87  __exchange_and_add(volatile _Atomic_word* __mem, int __val) throw ()
88  {
89    __gnu_cxx::__scoped_lock sentry(atomic_mutex);
90    _Atomic_word __result;
91    __result = *__mem;
92    *__mem += __val;
93    return __result;
94  }
95
96  void
97  __attribute__ ((__unused__))
98  __atomic_add(volatile _Atomic_word* __mem, int __val) throw ()
99  { __exchange_and_add(__mem, __val); }
100
101_GLIBCXX_END_NAMESPACE
102
103#endif /* !__SH4A__ */
104