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* include/ext/atomicity.h
[pf3gnuchains/gcc-fork.git] / libstdc++-v3 / config / cpu / cris / atomicity.h
1 // Low-level functions for atomic operations: CRIS version  -*- C++ -*-
2
3 // Copyright (C) 2001, 2003, 2004, 2005, 2009 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 #include <ext/atomicity.h>
26
27 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
28
29   _Atomic_word
30   __exchange_and_add(volatile _Atomic_word* __mem, int __val) throw ()
31   {
32     int __tmp;
33     _Atomic_word __result;
34
35 #if (__CRIS_arch_version >= 32)
36   __asm__ __volatile__ (" clearf p             \n"
37                        "0:                     \n"
38                        " move.d %4,%2          \n"
39                        " move.d [%3],%0        \n"
40                        " add.d %0,%2           \n"
41                        " ax                    \n"
42                        " move.d %2,[%3]        \n"
43                        " bcs 0b                \n"
44                        " clearf p              \n"
45                        :  "=&r" (__result), "=Q" (*__mem), "=&r" (__tmp)
46                        : "r" (__mem), "g" (__val), "Q" (*__mem)
47                        : "memory");
48 #elif (__CRIS_arch_version >= 10)
49     __asm__ __volatile__ (" clearf              \n"
50                         "0:                     \n"
51                         " move.d %4,%2          \n"
52                         " move.d [%3],%0        \n"
53                         " add.d %0,%2           \n"
54                         " ax                    \n"
55                         " move.d %2,[%3]        \n"
56                         " bwf 0b                \n"
57                         " clearf                \n"
58                         :  "=&r" (__result), "=Q" (*__mem), "=&r" (__tmp)
59                         : "r" (__mem), "g" (__val), "Q" (*__mem)
60                         /* The memory clobber must stay, regardless of
61                            current uses of this function.  */
62                         : "memory");
63 #else
64     __asm__ __volatile__ (" move $ccr,$r9       \n"
65                         " di                    \n"
66                         " move.d %4,%2          \n"
67                         " move.d [%3],%0        \n"
68                         " add.d %0,%2           \n"
69                         " move.d %2,[%3]        \n"
70                         " move $r9,$ccr         \n"
71                         :  "=&r" (__result), "=Q" (*__mem), "=&r" (__tmp)
72                         : "r" (__mem), "g" (__val), "Q" (*__mem)
73                         : "r9",
74                           /* The memory clobber must stay, regardless of
75                              current uses of this function.  */
76                           "memory");
77 #endif
78
79     return __result;
80   }
81
82   void
83   __atomic_add(volatile _Atomic_word* __mem, int __val) throw ()
84   { __exchange_and_add(__mem, __val); }
85
86 _GLIBCXX_END_NAMESPACE