125 lines
3.5 KiB
C++
125 lines
3.5 KiB
C++
// Low-level functions for atomic operations: Sparc version -*- C++ -*-
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// Copyright (C) 1999-2014 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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#include <ext/atomicity.h>
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namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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#ifdef __arch64__
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_Atomic_word
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__attribute__ ((__unused__))
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__exchange_and_add(volatile _Atomic_word* __mem, int __val) throw ()
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{
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_Atomic_word __tmp1, __tmp2;
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_Atomic_word __val_extended = __val;
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__asm__ __volatile__("1: ldx [%3], %0\n\t"
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" add %0, %4, %1\n\t"
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" casx [%3], %0, %1\n\t"
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" sub %0, %1, %0\n\t"
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" brnz,pn %0, 1b\n\t"
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" nop"
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: "=&r" (__tmp1), "=&r" (__tmp2), "=m" (*__mem)
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: "r" (__mem), "r" (__val_extended), "m" (*__mem));
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return __tmp2;
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}
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void
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__attribute__ ((__unused__))
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__atomic_add(volatile _Atomic_word* __mem, int __val) throw ()
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{
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_Atomic_word __tmp1, __tmp2;
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_Atomic_word __val_extended = __val;
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__asm__ __volatile__("1: ldx [%3], %0\n\t"
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" add %0, %4, %1\n\t"
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" casx [%3], %0, %1\n\t"
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" sub %0, %1, %0\n\t"
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" brnz,pn %0, 1b\n\t"
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" nop"
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: "=&r" (__tmp1), "=&r" (__tmp2), "=m" (*__mem)
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: "r" (__mem), "r" (__val_extended), "m" (*__mem));
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}
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#else /* __arch32__ */
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template<int __inst>
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struct _Atomicity_lock
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{
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static unsigned char _S_atomicity_lock;
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};
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template<int __inst>
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unsigned char _Atomicity_lock<__inst>::_S_atomicity_lock = 0;
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template unsigned char _Atomicity_lock<0>::_S_atomicity_lock;
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_Atomic_word
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__attribute__ ((__unused__))
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__exchange_and_add(volatile _Atomic_word* __mem, int __val) throw ()
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{
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_Atomic_word __result, __tmp;
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__asm__ __volatile__("1: ldstub [%1], %0\n\t"
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" cmp %0, 0\n\t"
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" bne 1b\n\t"
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" nop"
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: "=&r" (__tmp)
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: "r" (&_Atomicity_lock<0>::_S_atomicity_lock)
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: "memory");
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__result = *__mem;
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*__mem += __val;
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__asm__ __volatile__("stb %%g0, [%0]"
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: /* no outputs */
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: "r" (&_Atomicity_lock<0>::_S_atomicity_lock)
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: "memory");
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return __result;
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}
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void
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__attribute__ ((__unused__))
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__atomic_add(volatile _Atomic_word* __mem, int __val) throw ()
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{
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_Atomic_word __tmp;
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__asm__ __volatile__("1: ldstub [%1], %0\n\t"
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" cmp %0, 0\n\t"
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" bne 1b\n\t"
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" nop"
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: "=&r" (__tmp)
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: "r" (&_Atomicity_lock<0>::_S_atomicity_lock)
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: "memory");
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*__mem += __val;
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__asm__ __volatile__("stb %%g0, [%0]"
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: /* no outputs */
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: "r" (&_Atomicity_lock<0>::_S_atomicity_lock)
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: "memory");
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}
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#endif /* __arch32__ */
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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