1 // Low-level functions for atomic operations: Sparc version -*- C++ -*-
3 // Copyright (C) 1999, 2000, 2001, 2002, 2004 Free Software Foundation, Inc.
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)
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.
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,
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.
30 #include <bits/atomicity.h>
36 __attribute__ ((__unused__))
37 __exchange_and_add(volatile _Atomic_word* __mem, int __val)
39 _Atomic_word __tmp1, __tmp2;
40 _Atomic_word __val_extended = __val;
42 __asm__ __volatile__("1: ldx [%3], %0\n\t"
44 " casx [%3], %0, %1\n\t"
48 : "=&r" (__tmp1), "=&r" (__tmp2), "=m" (*__mem)
49 : "r" (__mem), "r" (__val_extended), "m" (*__mem));
54 __attribute__ ((__unused__))
55 __atomic_add(volatile _Atomic_word* __mem, int __val)
57 _Atomic_word __tmp1, __tmp2;
58 _Atomic_word __val_extended = __val;
60 __asm__ __volatile__("1: ldx [%3], %0\n\t"
62 " casx [%3], %0, %1\n\t"
66 : "=&r" (__tmp1), "=&r" (__tmp2), "=m" (*__mem)
67 : "r" (__mem), "r" (__val_extended), "m" (*__mem));
70 #else /* __arch32__ */
73 struct _Atomicity_lock
75 static unsigned char _S_atomicity_lock;
79 unsigned char _Atomicity_lock<__inst>::_S_atomicity_lock = 0;
81 template unsigned char _Atomicity_lock<0>::_S_atomicity_lock;
84 __attribute__ ((__unused__))
85 __exchange_and_add(volatile _Atomic_word* __mem, int __val)
87 _Atomic_word __result, __tmp;
89 __asm__ __volatile__("1: ldstub [%1], %0\n\t"
94 : "r" (&_Atomicity_lock<0>::_S_atomicity_lock)
98 __asm__ __volatile__("stb %%g0, [%0]"
100 : "r" (&_Atomicity_lock<0>::_S_atomicity_lock)
106 __attribute__ ((__unused__))
107 __atomic_add(volatile _Atomic_word* __mem, int __val)
111 __asm__ __volatile__("1: ldstub [%1], %0\n\t"
116 : "r" (&_Atomicity_lock<0>::_S_atomicity_lock)
119 __asm__ __volatile__("stb %%g0, [%0]"
121 : "r" (&_Atomicity_lock<0>::_S_atomicity_lock)
124 #endif /* __arch32__ */
125 } // namespace __gnu_cxx