atomicity.h revision 117397 
1// Low-level functions for atomic operations: CRIS version  -*- C++ -*-
2
3// Copyright (C) 2001 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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#ifndef _BITS_ATOMICITY_H
31#define _BITS_ATOMICITY_H	1
32
33// This entity must not cross a page boundary.
34typedef int _Atomic_word __attribute__ ((__aligned__ (4)));
35
36static inline _Atomic_word
37__attribute__ ((__unused__))
38__exchange_and_add (_Atomic_word* __mem, int __val)
39{
40  int __tmp;
41  _Atomic_word __result;
42
43#if (__CRIS_arch_version >= 10)
44  __asm__ __volatile__ (" clearf		\n"
45			"0:			\n"
46			" move.d %4,%2		\n"
47			" move.d [%3],%0	\n"
48			" add.d %0,%2		\n"
49			" ax			\n"
50			" move.d %2,[%3]	\n"
51			" bwf 0b		\n"
52			" clearf		\n"
53			:  "=&r" (__result), "=m" (*__mem), "=&r" (__tmp)
54			: "r" (__mem), "g" (__val), "m" (*__mem)
55			: "memory");
56#else
57  __asm__ __volatile__ (" move $ccr,$r9		\n"
58			" di			\n"
59			" move.d %4,%2		\n"
60			" move.d [%3],%0	\n"
61			" add.d %0,%2		\n"
62			" move.d %2,[%3]	\n"
63			" move $r9,$ccr		\n"
64			:  "=&r" (__result), "=m" (*__mem), "=&r" (__tmp)
65			: "r" (__mem), "g" (__val), "m" (*__mem)
66			: "memory", "r9");
67#endif
68
69  return __result;
70}
71
72static inline void
73__attribute__ ((__unused__))
74__atomic_add (_Atomic_word* __mem, int __val)
75{
76  __exchange_and_add (__mem, __val);
77}
78
79#endif /* atomicity.h */
80