1 // Low-level functions for atomic operations: sh version -*- C++ -*-
2
3 // Copyright (C) 1999-2014 Free Software Foundation, Inc.
4 //
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 3, or (at your option)
9 // any later version.
10
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
15
16 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
19
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 // <http://www.gnu.org/licenses/>.
24
25 #ifdef __SH4A__
26
27 #include <ext/atomicity.h>
28
_GLIBCXX_VISIBILITY(default)29 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
30 {
31 _GLIBCXX_BEGIN_NAMESPACE_VERSION
32
33 typedef int _Atomic_word;
34
35 _Atomic_word
36 __attribute__ ((__unused__))
37 __exchange_and_add (volatile _Atomic_word* __mem, int __val) throw ()
38 {
39 _Atomic_word __result;
40
41 __asm__ __volatile__
42 ("0:\n"
43 "\tmovli.l\t@%2,r0\n"
44 "\tmov\tr0,%1\n"
45 "\tadd\t%3,r0\n"
46 "\tmovco.l\tr0,@%2\n"
47 "\tbf\t0b"
48 : "+m" (*__mem), "=&r" (__result)
49 : "r" (__mem), "rI08" (__val)
50 : "r0");
51
52 return __result;
53 }
54
55
56 void
57 __attribute__ ((__unused__))
58 __atomic_add (volatile _Atomic_word* __mem, int __val) throw ()
59 {
60 asm("0:\n"
61 "\tmovli.l\t@%1,r0\n"
62 "\tadd\t%2,r0\n"
63 "\tmovco.l\tr0,@%1\n"
64 "\tbf\t0b"
65 : "+m" (*__mem)
66 : "r" (__mem), "rI08" (__val)
67 : "r0");
68 }
69
70 _GLIBCXX_END_NAMESPACE_VERSION
71 } // namespace
72
73 #else /* !__SH4A__ */
74
75 /* This is generic/atomicity.h */
76
77 #include <ext/atomicity.h>
78 #include <ext/concurrence.h>
79
80 namespace
81 {
82 __gnu_cxx::__mutex atomic_mutex;
83 } // anonymous namespace
84
_GLIBCXX_VISIBILITY(default)85 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
86 {
87 _GLIBCXX_BEGIN_NAMESPACE_VERSION
88
89 _Atomic_word
90 __attribute__ ((__unused__))
91 __exchange_and_add(volatile _Atomic_word* __mem, int __val) throw ()
92 {
93 __gnu_cxx::__scoped_lock sentry(atomic_mutex);
94 _Atomic_word __result;
95 __result = *__mem;
96 *__mem += __val;
97 return __result;
98 }
99
100 void
101 __attribute__ ((__unused__))
102 __atomic_add(volatile _Atomic_word* __mem, int __val) throw ()
103 { __exchange_and_add(__mem, __val); }
104
105 _GLIBCXX_END_NAMESPACE_VERSION
106 } // namespace
107
108 #endif /* !__SH4A__ */
109