1 // Low-level functions for atomic operations: Sparc version -*- C++ -*-
3 // Copyright (C) 1999, 2000, 2001, 2002, 2004, 2005
4 // Free Software Foundation, Inc.
6 // This file is part of the GNU ISO C++ Library. This library is free
7 // software; you can redistribute it and/or modify it under the
8 // terms of the GNU General Public License as published by the
9 // Free Software Foundation; either version 2, or (at your option)
12 // This library is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 // GNU General Public License for more details.
17 // You should have received a copy of the GNU General Public License along
18 // with this library; see the file COPYING. If not, write to the Free
19 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
22 // As a special exception, you may use this file as part of a free software
23 // library without restriction. Specifically, if other files instantiate
24 // templates or use macros or inline functions from this file, or you compile
25 // this file and link it with other files to produce an executable, this
26 // file does not by itself cause the resulting executable to be covered by
27 // the GNU General Public License. This exception does not however
28 // invalidate any other reasons why the executable file might be covered by
29 // the GNU General Public License.
31 #include <ext/atomicity.h>
33 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
37 __attribute__ ((__unused__))
38 __exchange_and_add(volatile _Atomic_word* __mem, int __val)
40 _Atomic_word __tmp1, __tmp2;
41 _Atomic_word __val_extended = __val;
43 __asm__ __volatile__("1: ldx [%3], %0\n\t"
45 " casx [%3], %0, %1\n\t"
49 : "=&r" (__tmp1), "=&r" (__tmp2), "=m" (*__mem)
50 : "r" (__mem), "r" (__val_extended), "m" (*__mem));
55 __attribute__ ((__unused__))
56 __atomic_add(volatile _Atomic_word* __mem, int __val)
58 _Atomic_word __tmp1, __tmp2;
59 _Atomic_word __val_extended = __val;
61 __asm__ __volatile__("1: ldx [%3], %0\n\t"
63 " casx [%3], %0, %1\n\t"
67 : "=&r" (__tmp1), "=&r" (__tmp2), "=m" (*__mem)
68 : "r" (__mem), "r" (__val_extended), "m" (*__mem));
71 #else /* __arch32__ */
74 struct _Atomicity_lock
76 static unsigned char _S_atomicity_lock;
80 unsigned char _Atomicity_lock<__inst>::_S_atomicity_lock = 0;
82 template unsigned char _Atomicity_lock<0>::_S_atomicity_lock;
85 __attribute__ ((__unused__))
86 __exchange_and_add(volatile _Atomic_word* __mem, int __val)
88 _Atomic_word __result, __tmp;
90 __asm__ __volatile__("1: ldstub [%1], %0\n\t"
95 : "r" (&_Atomicity_lock<0>::_S_atomicity_lock)
99 __asm__ __volatile__("stb %%g0, [%0]"
101 : "r" (&_Atomicity_lock<0>::_S_atomicity_lock)
107 __attribute__ ((__unused__))
108 __atomic_add(volatile _Atomic_word* __mem, int __val)
112 __asm__ __volatile__("1: ldstub [%1], %0\n\t"
117 : "r" (&_Atomicity_lock<0>::_S_atomicity_lock)
120 __asm__ __volatile__("stb %%g0, [%0]"
122 : "r" (&_Atomicity_lock<0>::_S_atomicity_lock)
125 #endif /* __arch32__ */
127 _GLIBCXX_END_NAMESPACE