1 // Low-level functions for atomic operations: CRIS version -*- C++ -*-
2
3 // Copyright (C) 2001-2020 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
_GLIBCXX_VISIBILITY(default)27 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
28 {
29 _GLIBCXX_BEGIN_NAMESPACE_VERSION
30
31 _Atomic_word
32 __exchange_and_add(volatile _Atomic_word* __mem, int __val) throw ()
33 {
34 int __tmp;
35 _Atomic_word __result;
36
37 #if (__CRIS_arch_version >= 32)
38 __asm__ __volatile__ (" clearf p \n"
39 "0: \n"
40 " move.d %4,%2 \n"
41 " move.d [%3],%0 \n"
42 " add.d %0,%2 \n"
43 " ax \n"
44 " move.d %2,[%3] \n"
45 " bcs 0b \n"
46 " clearf p \n"
47 : "=&r" (__result), "=Q" (*__mem), "=&r" (__tmp)
48 : "r" (__mem), "g" (__val), "Q" (*__mem)
49 : "memory");
50 #elif (__CRIS_arch_version >= 10)
51 __asm__ __volatile__ (" clearf \n"
52 "0: \n"
53 " move.d %4,%2 \n"
54 " move.d [%3],%0 \n"
55 " add.d %0,%2 \n"
56 " ax \n"
57 " move.d %2,[%3] \n"
58 " bwf 0b \n"
59 " clearf \n"
60 : "=&r" (__result), "=Q" (*__mem), "=&r" (__tmp)
61 : "r" (__mem), "g" (__val), "Q" (*__mem)
62 /* The memory clobber must stay, regardless of
63 current uses of this function. */
64 : "memory");
65 #else
66 __asm__ __volatile__ (" move $ccr,$r9 \n"
67 " di \n"
68 " move.d %4,%2 \n"
69 " move.d [%3],%0 \n"
70 " add.d %0,%2 \n"
71 " move.d %2,[%3] \n"
72 " move $r9,$ccr \n"
73 : "=&r" (__result), "=Q" (*__mem), "=&r" (__tmp)
74 : "r" (__mem), "g" (__val), "Q" (*__mem)
75 : "r9",
76 /* The memory clobber must stay, regardless of
77 current uses of this function. */
78 "memory");
79 #endif
80
81 return __result;
82 }
83
84 void
85 __atomic_add(volatile _Atomic_word* __mem, int __val) throw ()
86 { __exchange_and_add(__mem, __val); }
87
88 _GLIBCXX_END_NAMESPACE_VERSION
89 } // namespace
90