1 // Low-level functions for atomic operations: Sparc version -*- C++ -*-
2
3 // Copyright (C) 1999, 2000, 2001, 2002, 2004, 2005
4 // Free Software Foundation, Inc.
5 //
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)
10 // any later version.
11
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.
16
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,
20 // USA.
21
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.
30
31 #include <ext/atomicity.h>
32
_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)33 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
34
35 #ifdef __arch64__
36 _Atomic_word
37 __attribute__ ((__unused__))
38 __exchange_and_add(volatile _Atomic_word* __mem, int __val)
39 {
40 _Atomic_word __tmp1, __tmp2;
41 _Atomic_word __val_extended = __val;
42
43 __asm__ __volatile__("1: ldx [%3], %0\n\t"
44 " add %0, %4, %1\n\t"
45 " casx [%3], %0, %1\n\t"
46 " sub %0, %1, %0\n\t"
47 " brnz,pn %0, 1b\n\t"
48 " nop"
49 : "=&r" (__tmp1), "=&r" (__tmp2), "=m" (*__mem)
50 : "r" (__mem), "r" (__val_extended), "m" (*__mem));
51 return __tmp2;
52 }
53
54 void
55 __attribute__ ((__unused__))
__atomic_add(volatile _Atomic_word * __mem,int __val)56 __atomic_add(volatile _Atomic_word* __mem, int __val)
57 {
58 _Atomic_word __tmp1, __tmp2;
59 _Atomic_word __val_extended = __val;
60
61 __asm__ __volatile__("1: ldx [%3], %0\n\t"
62 " add %0, %4, %1\n\t"
63 " casx [%3], %0, %1\n\t"
64 " sub %0, %1, %0\n\t"
65 " brnz,pn %0, 1b\n\t"
66 " nop"
67 : "=&r" (__tmp1), "=&r" (__tmp2), "=m" (*__mem)
68 : "r" (__mem), "r" (__val_extended), "m" (*__mem));
69 }
70
71 #else /* __arch32__ */
72
73 template<int __inst>
74 struct _Atomicity_lock
75 {
76 static unsigned char _S_atomicity_lock;
77 };
78
79 template<int __inst>
80 unsigned char _Atomicity_lock<__inst>::_S_atomicity_lock = 0;
81
82 template unsigned char _Atomicity_lock<0>::_S_atomicity_lock;
83
84 _Atomic_word
85 __attribute__ ((__unused__))
86 __exchange_and_add(volatile _Atomic_word* __mem, int __val)
87 {
88 _Atomic_word __result, __tmp;
89
90 __asm__ __volatile__("1: ldstub [%1], %0\n\t"
91 " cmp %0, 0\n\t"
92 " bne 1b\n\t"
93 " nop"
94 : "=&r" (__tmp)
95 : "r" (&_Atomicity_lock<0>::_S_atomicity_lock)
96 : "memory");
97 __result = *__mem;
98 *__mem += __val;
99 __asm__ __volatile__("stb %%g0, [%0]"
100 : /* no outputs */
101 : "r" (&_Atomicity_lock<0>::_S_atomicity_lock)
102 : "memory");
103 return __result;
104 }
105
106 void
107 __attribute__ ((__unused__))
108 __atomic_add(volatile _Atomic_word* __mem, int __val)
109 {
110 _Atomic_word __tmp;
111
112 __asm__ __volatile__("1: ldstub [%1], %0\n\t"
113 " cmp %0, 0\n\t"
114 " bne 1b\n\t"
115 " nop"
116 : "=&r" (__tmp)
117 : "r" (&_Atomicity_lock<0>::_S_atomicity_lock)
118 : "memory");
119 *__mem += __val;
120 __asm__ __volatile__("stb %%g0, [%0]"
121 : /* no outputs */
122 : "r" (&_Atomicity_lock<0>::_S_atomicity_lock)
123 : "memory");
124 }
125 #endif /* __arch32__ */
126
127 _GLIBCXX_END_NAMESPACE
128