| 1 |
742 |
jeremybenn |
// Low-level functions for atomic operations: PA-RISC version -*- C++ -*-
|
| 2 |
|
|
|
| 3 |
|
|
// Copyright (C) 2002, 2004, 2005, 2009 Free Software Foundation, Inc.
|
| 4 |
|
|
//
|
| 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 3, or (at your option)
|
| 9 |
|
|
// any later version.
|
| 10 |
|
|
|
| 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.
|
| 15 |
|
|
|
| 16 |
|
|
// Under Section 7 of GPL version 3, you are granted additional
|
| 17 |
|
|
// permissions described in the GCC Runtime Library Exception, version
|
| 18 |
|
|
// 3.1, as published by the Free Software Foundation.
|
| 19 |
|
|
|
| 20 |
|
|
// You should have received a copy of the GNU General Public License and
|
| 21 |
|
|
// a copy of the GCC Runtime Library Exception along with this program;
|
| 22 |
|
|
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
| 23 |
|
|
// <http://www.gnu.org/licenses/>.
|
| 24 |
|
|
|
| 25 |
|
|
#include <bits/c++config.h>
|
| 26 |
|
|
#include <ext/atomicity.h>
|
| 27 |
|
|
|
| 28 |
|
|
namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
|
| 29 |
|
|
{
|
| 30 |
|
|
_GLIBCXX_BEGIN_NAMESPACE_VERSION
|
| 31 |
|
|
|
| 32 |
|
|
template<int _Inst>
|
| 33 |
|
|
struct _Atomicity_lock
|
| 34 |
|
|
{
|
| 35 |
|
|
static volatile int _S_atomicity_lock;
|
| 36 |
|
|
};
|
| 37 |
|
|
|
| 38 |
|
|
template<int _Inst>
|
| 39 |
|
|
volatile int
|
| 40 |
|
|
_Atomicity_lock<_Inst>::_S_atomicity_lock __attribute__ ((aligned (16))) = 1;
|
| 41 |
|
|
|
| 42 |
|
|
// Because of the lack of weak support when using the hpux som
|
| 43 |
|
|
// linker, we explicitly instantiate the atomicity lock.
|
| 44 |
|
|
template volatile int _Atomicity_lock<0>::_S_atomicity_lock;
|
| 45 |
|
|
|
| 46 |
|
|
int
|
| 47 |
|
|
__attribute__ ((__unused__))
|
| 48 |
|
|
__exchange_and_add(volatile _Atomic_word* __mem, int __val) throw ()
|
| 49 |
|
|
{
|
| 50 |
|
|
_Atomic_word result;
|
| 51 |
|
|
int tmp;
|
| 52 |
|
|
volatile int& lock = _Atomicity_lock<0>::_S_atomicity_lock;
|
| 53 |
|
|
|
| 54 |
|
|
__asm__ __volatile__ ("ldcw 0(%1),%0\n\t"
|
| 55 |
|
|
"cmpib,<>,n 0,%0,.+20\n\t"
|
| 56 |
|
|
"ldw 0(%1),%0\n\t"
|
| 57 |
|
|
"cmpib,= 0,%0,.-4\n\t"
|
| 58 |
|
|
"nop\n\t"
|
| 59 |
|
|
"b,n .-20"
|
| 60 |
|
|
: "=&r" (tmp)
|
| 61 |
|
|
: "r" (&lock)
|
| 62 |
|
|
: "memory");
|
| 63 |
|
|
|
| 64 |
|
|
result = *__mem;
|
| 65 |
|
|
*__mem = result + __val;
|
| 66 |
|
|
__asm__ __volatile__ ("stw %1,0(%0)"
|
| 67 |
|
|
: : "r" (&lock), "r" (tmp) : "memory");
|
| 68 |
|
|
return result;
|
| 69 |
|
|
}
|
| 70 |
|
|
|
| 71 |
|
|
void
|
| 72 |
|
|
__attribute__ ((__unused__))
|
| 73 |
|
|
__atomic_add(volatile _Atomic_word* __mem, int __val) throw ()
|
| 74 |
|
|
{
|
| 75 |
|
|
int tmp;
|
| 76 |
|
|
volatile int& lock = _Atomicity_lock<0>::_S_atomicity_lock;
|
| 77 |
|
|
|
| 78 |
|
|
__asm__ __volatile__ ("ldcw 0(%1),%0\n\t"
|
| 79 |
|
|
"cmpib,<>,n 0,%0,.+20\n\t"
|
| 80 |
|
|
"ldw 0(%1),%0\n\t"
|
| 81 |
|
|
"cmpib,= 0,%0,.-4\n\t"
|
| 82 |
|
|
"nop\n\t"
|
| 83 |
|
|
"b,n .-20"
|
| 84 |
|
|
: "=&r" (tmp)
|
| 85 |
|
|
: "r" (&lock)
|
| 86 |
|
|
: "memory");
|
| 87 |
|
|
|
| 88 |
|
|
*__mem += __val;
|
| 89 |
|
|
__asm__ __volatile__ ("stw %1,0(%0)"
|
| 90 |
|
|
: : "r" (&lock), "r" (tmp) : "memory");
|
| 91 |
|
|
}
|
| 92 |
|
|
|
| 93 |
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
| 94 |
|
|
} // namespace
|
