1*404b540aSrobert // Low-level functions for atomic operations: Sparc version -*- C++ -*-
2*404b540aSrobert
3*404b540aSrobert // Copyright (C) 1999, 2000, 2001, 2002, 2004, 2005
4*404b540aSrobert // Free Software Foundation, Inc.
5*404b540aSrobert //
6*404b540aSrobert // This file is part of the GNU ISO C++ Library. This library is free
7*404b540aSrobert // software; you can redistribute it and/or modify it under the
8*404b540aSrobert // terms of the GNU General Public License as published by the
9*404b540aSrobert // Free Software Foundation; either version 2, or (at your option)
10*404b540aSrobert // any later version.
11*404b540aSrobert
12*404b540aSrobert // This library is distributed in the hope that it will be useful,
13*404b540aSrobert // but WITHOUT ANY WARRANTY; without even the implied warranty of
14*404b540aSrobert // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15*404b540aSrobert // GNU General Public License for more details.
16*404b540aSrobert
17*404b540aSrobert // You should have received a copy of the GNU General Public License along
18*404b540aSrobert // with this library; see the file COPYING. If not, write to the Free
19*404b540aSrobert // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
20*404b540aSrobert // USA.
21*404b540aSrobert
22*404b540aSrobert // As a special exception, you may use this file as part of a free software
23*404b540aSrobert // library without restriction. Specifically, if other files instantiate
24*404b540aSrobert // templates or use macros or inline functions from this file, or you compile
25*404b540aSrobert // this file and link it with other files to produce an executable, this
26*404b540aSrobert // file does not by itself cause the resulting executable to be covered by
27*404b540aSrobert // the GNU General Public License. This exception does not however
28*404b540aSrobert // invalidate any other reasons why the executable file might be covered by
29*404b540aSrobert // the GNU General Public License.
30*404b540aSrobert
31*404b540aSrobert #include <ext/atomicity.h>
32*404b540aSrobert
_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)33*404b540aSrobert _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
34*404b540aSrobert
35*404b540aSrobert #ifdef __arch64__
36*404b540aSrobert _Atomic_word
37*404b540aSrobert __attribute__ ((__unused__))
38*404b540aSrobert __exchange_and_add(volatile _Atomic_word* __mem, int __val)
39*404b540aSrobert {
40*404b540aSrobert _Atomic_word __tmp1, __tmp2;
41*404b540aSrobert _Atomic_word __val_extended = __val;
42*404b540aSrobert
43*404b540aSrobert __asm__ __volatile__("1: ldx [%3], %0\n\t"
44*404b540aSrobert " add %0, %4, %1\n\t"
45*404b540aSrobert " casx [%3], %0, %1\n\t"
46*404b540aSrobert " sub %0, %1, %0\n\t"
47*404b540aSrobert " brnz,pn %0, 1b\n\t"
48*404b540aSrobert " nop"
49*404b540aSrobert : "=&r" (__tmp1), "=&r" (__tmp2), "=m" (*__mem)
50*404b540aSrobert : "r" (__mem), "r" (__val_extended), "m" (*__mem));
51*404b540aSrobert return __tmp2;
52*404b540aSrobert }
53*404b540aSrobert
54*404b540aSrobert void
55*404b540aSrobert __attribute__ ((__unused__))
__atomic_add(volatile _Atomic_word * __mem,int __val)56*404b540aSrobert __atomic_add(volatile _Atomic_word* __mem, int __val)
57*404b540aSrobert {
58*404b540aSrobert _Atomic_word __tmp1, __tmp2;
59*404b540aSrobert _Atomic_word __val_extended = __val;
60*404b540aSrobert
61*404b540aSrobert __asm__ __volatile__("1: ldx [%3], %0\n\t"
62*404b540aSrobert " add %0, %4, %1\n\t"
63*404b540aSrobert " casx [%3], %0, %1\n\t"
64*404b540aSrobert " sub %0, %1, %0\n\t"
65*404b540aSrobert " brnz,pn %0, 1b\n\t"
66*404b540aSrobert " nop"
67*404b540aSrobert : "=&r" (__tmp1), "=&r" (__tmp2), "=m" (*__mem)
68*404b540aSrobert : "r" (__mem), "r" (__val_extended), "m" (*__mem));
69*404b540aSrobert }
70*404b540aSrobert
71*404b540aSrobert #else /* __arch32__ */
72*404b540aSrobert
73*404b540aSrobert template<int __inst>
74*404b540aSrobert struct _Atomicity_lock
75*404b540aSrobert {
76*404b540aSrobert static unsigned char _S_atomicity_lock;
77*404b540aSrobert };
78*404b540aSrobert
79*404b540aSrobert template<int __inst>
80*404b540aSrobert unsigned char _Atomicity_lock<__inst>::_S_atomicity_lock = 0;
81*404b540aSrobert
82*404b540aSrobert template unsigned char _Atomicity_lock<0>::_S_atomicity_lock;
83*404b540aSrobert
84*404b540aSrobert _Atomic_word
85*404b540aSrobert __attribute__ ((__unused__))
86*404b540aSrobert __exchange_and_add(volatile _Atomic_word* __mem, int __val)
87*404b540aSrobert {
88*404b540aSrobert _Atomic_word __result, __tmp;
89*404b540aSrobert
90*404b540aSrobert __asm__ __volatile__("1: ldstub [%1], %0\n\t"
91*404b540aSrobert " cmp %0, 0\n\t"
92*404b540aSrobert " bne 1b\n\t"
93*404b540aSrobert " nop"
94*404b540aSrobert : "=&r" (__tmp)
95*404b540aSrobert : "r" (&_Atomicity_lock<0>::_S_atomicity_lock)
96*404b540aSrobert : "memory");
97*404b540aSrobert __result = *__mem;
98*404b540aSrobert *__mem += __val;
99*404b540aSrobert __asm__ __volatile__("stb %%g0, [%0]"
100*404b540aSrobert : /* no outputs */
101*404b540aSrobert : "r" (&_Atomicity_lock<0>::_S_atomicity_lock)
102*404b540aSrobert : "memory");
103*404b540aSrobert return __result;
104*404b540aSrobert }
105*404b540aSrobert
106*404b540aSrobert void
107*404b540aSrobert __attribute__ ((__unused__))
108*404b540aSrobert __atomic_add(volatile _Atomic_word* __mem, int __val)
109*404b540aSrobert {
110*404b540aSrobert _Atomic_word __tmp;
111*404b540aSrobert
112*404b540aSrobert __asm__ __volatile__("1: ldstub [%1], %0\n\t"
113*404b540aSrobert " cmp %0, 0\n\t"
114*404b540aSrobert " bne 1b\n\t"
115*404b540aSrobert " nop"
116*404b540aSrobert : "=&r" (__tmp)
117*404b540aSrobert : "r" (&_Atomicity_lock<0>::_S_atomicity_lock)
118*404b540aSrobert : "memory");
119*404b540aSrobert *__mem += __val;
120*404b540aSrobert __asm__ __volatile__("stb %%g0, [%0]"
121*404b540aSrobert : /* no outputs */
122*404b540aSrobert : "r" (&_Atomicity_lock<0>::_S_atomicity_lock)
123*404b540aSrobert : "memory");
124*404b540aSrobert }
125*404b540aSrobert #endif /* __arch32__ */
126*404b540aSrobert
127*404b540aSrobert _GLIBCXX_END_NAMESPACE
128