diff options
Diffstat (limited to 'gcc-4.4.3/libstdc++-v3/config/cpu/m68k/atomicity.h')
-rw-r--r-- | gcc-4.4.3/libstdc++-v3/config/cpu/m68k/atomicity.h | 129 |
1 files changed, 0 insertions, 129 deletions
diff --git a/gcc-4.4.3/libstdc++-v3/config/cpu/m68k/atomicity.h b/gcc-4.4.3/libstdc++-v3/config/cpu/m68k/atomicity.h deleted file mode 100644 index e6cdbeebc..000000000 --- a/gcc-4.4.3/libstdc++-v3/config/cpu/m68k/atomicity.h +++ /dev/null @@ -1,129 +0,0 @@ -// Low-level functions for atomic operations: m68k version -*- C++ -*- - -// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2009 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 3, 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. - -// Under Section 7 of GPL version 3, you are granted additional -// permissions described in the GCC Runtime Library Exception, version -// 3.1, as published by the Free Software Foundation. - -// You should have received a copy of the GNU General Public License and -// a copy of the GCC Runtime Library Exception along with this program; -// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -// <http://www.gnu.org/licenses/>. - -#include <ext/atomicity.h> - -_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx) - -#if ( defined(__mc68020__) || defined(__mc68030__) \ - || defined(__mc68040__) || defined(__mc68060__) ) \ - && !defined(__mcpu32__) - // These variants support compare-and-swap. - _Atomic_word - __attribute__ ((__unused__)) - __exchange_and_add(volatile _Atomic_word* __mem, int __val) - { - register _Atomic_word __result = *__mem; - register _Atomic_word __temp; - __asm__ __volatile__ ("1: move%.l %0,%1\n\t" - "add%.l %3,%1\n\t" - "cas%.l %0,%1,%2\n\t" - "jne 1b" - : "=d" (__result), "=&d" (__temp), "=m" (*__mem) - : "d" (__val), "0" (__result), "m" (*__mem)); - return __result; - } - -#elif defined(__rtems__) - // TAS/JBNE is unsafe on systems with strict priority-based scheduling. - // Disable interrupts, which we can do only from supervisor mode. - _Atomic_word - __attribute__ ((__unused__)) - __exchange_and_add(volatile _Atomic_word* __mem, int __val) - { - _Atomic_word __result; - short __level, __tmpsr; - __asm__ __volatile__ ("move%.w %%sr,%0\n\tor%.l %0,%1\n\tmove%.w %1,%%sr" - : "=d"(__level), "=d"(__tmpsr) : "1"(0x700)); - - __result = *__mem; - *__mem = __result + __val; - __asm__ __volatile__ ("move%.w %0,%%sr" : : "d"(__level)); - - return __result; - } - -#else - - template<int __inst> - struct _Atomicity_lock - { - static volatile unsigned char _S_atomicity_lock; - }; - - template<int __inst> - volatile unsigned char _Atomicity_lock<__inst>::_S_atomicity_lock = 0; - - template volatile unsigned char _Atomicity_lock<0>::_S_atomicity_lock; - - _Atomic_word - __attribute__ ((__unused__)) - __exchange_and_add(volatile _Atomic_word* __mem, int __val) - { - _Atomic_word __result; - - // bset with no immediate addressing (not SMP-safe) -#if defined(__mcfisaa__) || defined(__mcfisaaplus__) - __asm__ __volatile__("1: bset.b #7,%0@\n\tjbne 1b" - : /* no outputs */ - : "a"(&_Atomicity_lock<0>::_S_atomicity_lock) - : "cc", "memory"); - - // CPU32 and CF ISAs B & C support test-and-set (SMP-safe). -#elif defined(__mcpu32__) || defined(__mcfisab__) || defined (__mcfisac__) - __asm__ __volatile__("1: tas %0\n\tjbne 1b" - : "+m"(_Atomicity_lock<0>::_S_atomicity_lock) - : /* none */ - : "cc"); - - // Use bset with immediate addressing for 68000/68010 (not SMP-safe) - // NOTE: TAS is available on the 68000, but unsupported by some Amiga - // memory controllers. -#else - __asm__ __volatile__("1: bset.b #7,%0\n\tjbne 1b" - : "+m"(_Atomicity_lock<0>::_S_atomicity_lock) - : /* none */ - : "cc"); -#endif - - __result = *__mem; - *__mem = __result + __val; - - _Atomicity_lock<0>::_S_atomicity_lock = 0; - - return __result; - } - -#endif /* TAS / BSET */ - - void - __attribute__ ((__unused__)) - __atomic_add(volatile _Atomic_word* __mem, int __val) - { - // Careful: using add.l with a memory destination is not - // architecturally guaranteed to be atomic. - __exchange_and_add(__mem, __val); - } - -_GLIBCXX_END_NAMESPACE |