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
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
75  __atomic_add(volatile _Atomic_word* __mem, int __val)
76  { __exchange_and_add(__mem, __val); }
77
78_GLIBCXX_END_NAMESPACE
79