1 // Low-level functions for atomic operations: CRIS version -*- C++ -*-
2
3 // Copyright (C) 2001, 2003, 2004, 2005 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 2, 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 // You should have received a copy of the GNU General Public License along
17 // with this library; see the file COPYING. If not, write to the Free
18 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
19 // USA.
20
21 // As a special exception, you may use this file as part of a free software
22 // library without restriction. Specifically, if other files instantiate
23 // templates or use macros or inline functions from this file, or you compile
24 // this file and link it with other files to produce an executable, this
25 // file does not by itself cause the resulting executable to be covered by
26 // the GNU General Public License. This exception does not however
27 // invalidate any other reasons why the executable file might be covered by
28 // the GNU General Public License.
29
30 #include <ext/atomicity.h>
31
_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)32 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
33
34 _Atomic_word
35 __exchange_and_add(volatile _Atomic_word* __mem, int __val)
36 {
37 int __tmp;
38 _Atomic_word __result;
39
40 #if (__CRIS_arch_version >= 10)
41 __asm__ __volatile__ (" clearf \n"
42 "0: \n"
43 " move.d %4,%2 \n"
44 " move.d [%3],%0 \n"
45 " add.d %0,%2 \n"
46 " ax \n"
47 " move.d %2,[%3] \n"
48 " bwf 0b \n"
49 " clearf \n"
50 : "=&r" (__result), "=Q" (*__mem), "=&r" (__tmp)
51 : "r" (__mem), "g" (__val), "Q" (*__mem)
52 /* The memory clobber must stay, regardless of
53 current uses of this function. */
54 : "memory");
55 #else
56 __asm__ __volatile__ (" move $ccr,$r9 \n"
57 " di \n"
58 " move.d %4,%2 \n"
59 " move.d [%3],%0 \n"
60 " add.d %0,%2 \n"
61 " move.d %2,[%3] \n"
62 " move $r9,$ccr \n"
63 : "=&r" (__result), "=Q" (*__mem), "=&r" (__tmp)
64 : "r" (__mem), "g" (__val), "Q" (*__mem)
65 : "r9",
66 /* The memory clobber must stay, regardless of
67 current uses of this function. */
68 "memory");
69 #endif
70
71 return __result;
72 }
73
74 void
__atomic_add(volatile _Atomic_word * __mem,int __val)75 __atomic_add(volatile _Atomic_word* __mem, int __val)
76 { __exchange_and_add(__mem, __val); }
77
78 _GLIBCXX_END_NAMESPACE
79