| // Low-level functions for atomic operations: Sparc version -*- C++ -*- |
| |
| // Copyright (C) 1999, 2000, 2001, 2002, 2004, 2005 |
| // 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 <ext/atomicity.h> |
| |
| _GLIBCXX_BEGIN_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__ */ |
| |
| _GLIBCXX_END_NAMESPACE |