1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
|
// Low-level functions for atomic operations: Sparc version -*- C++ -*-
// Copyright (C) 1999, 2000, 2001, 2002, 2004 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING. If not, write to the Free
// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
#include <bits/atomicity.h>
namespace __gnu_cxx
{
#ifdef __arch64__
_Atomic_word
__attribute__ ((__unused__))
__exchange_and_add(volatile _Atomic_word* __mem, int __val)
{
_Atomic_word __tmp1, __tmp2;
_Atomic_word __val_extended = __val;
__asm__ __volatile__("1: ldx [%3], %0\n\t"
" add %0, %4, %1\n\t"
" casx [%3], %0, %1\n\t"
" sub %0, %1, %0\n\t"
" brnz,pn %0, 1b\n\t"
" nop"
: "=&r" (__tmp1), "=&r" (__tmp2), "=m" (*__mem)
: "r" (__mem), "r" (__val_extended), "m" (*__mem));
return __tmp2;
}
void
__attribute__ ((__unused__))
__atomic_add(volatile _Atomic_word* __mem, int __val)
{
_Atomic_word __tmp1, __tmp2;
_Atomic_word __val_extended = __val;
__asm__ __volatile__("1: ldx [%3], %0\n\t"
" add %0, %4, %1\n\t"
" casx [%3], %0, %1\n\t"
" sub %0, %1, %0\n\t"
" brnz,pn %0, 1b\n\t"
" nop"
: "=&r" (__tmp1), "=&r" (__tmp2), "=m" (*__mem)
: "r" (__mem), "r" (__val_extended), "m" (*__mem));
}
#else /* __arch32__ */
template<int __inst>
struct _Atomicity_lock
{
static unsigned char _S_atomicity_lock;
};
template<int __inst>
unsigned char _Atomicity_lock<__inst>::_S_atomicity_lock = 0;
template unsigned char _Atomicity_lock<0>::_S_atomicity_lock;
_Atomic_word
__attribute__ ((__unused__))
__exchange_and_add(volatile _Atomic_word* __mem, int __val)
{
_Atomic_word __result, __tmp;
__asm__ __volatile__("1: ldstub [%1], %0\n\t"
" cmp %0, 0\n\t"
" bne 1b\n\t"
" nop"
: "=&r" (__tmp)
: "r" (&_Atomicity_lock<0>::_S_atomicity_lock)
: "memory");
__result = *__mem;
*__mem += __val;
__asm__ __volatile__("stb %%g0, [%0]"
: /* no outputs */
: "r" (&_Atomicity_lock<0>::_S_atomicity_lock)
: "memory");
return __result;
}
void
__attribute__ ((__unused__))
__atomic_add(volatile _Atomic_word* __mem, int __val)
{
_Atomic_word __tmp;
__asm__ __volatile__("1: ldstub [%1], %0\n\t"
" cmp %0, 0\n\t"
" bne 1b\n\t"
" nop"
: "=&r" (__tmp)
: "r" (&_Atomicity_lock<0>::_S_atomicity_lock)
: "memory");
*__mem += __val;
__asm__ __volatile__("stb %%g0, [%0]"
: /* no outputs */
: "r" (&_Atomicity_lock<0>::_S_atomicity_lock)
: "memory");
}
#endif /* __arch32__ */
} // namespace __gnu_cxx
|
