diff options
Diffstat (limited to 'libstdc++-v3/config/cpu/m68k/atomicity.h')
| -rw-r--r-- | libstdc++-v3/config/cpu/m68k/atomicity.h | 73 |
1 files changed, 26 insertions, 47 deletions
diff --git a/libstdc++-v3/config/cpu/m68k/atomicity.h b/libstdc++-v3/config/cpu/m68k/atomicity.h index 01c64dadc1c..d33bbef6dd9 100644 --- a/libstdc++-v3/config/cpu/m68k/atomicity.h +++ b/libstdc++-v3/config/cpu/m68k/atomicity.h @@ -1,6 +1,6 @@ // Low-level functions for atomic operations: m68k version -*- C++ -*- -// Copyright (C) 2001, 2002 Free Software Foundation, Inc. +// Copyright (C) 2001, 2002, 2003 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 @@ -32,8 +32,9 @@ typedef int _Atomic_word; -#if defined(__mc68020__) || defined(__mc68030__) \ - || defined(__mc68040__) || defined(__mc68060__) +#if ( defined(__mc68020__) || defined(__mc68030__) \ + || defined(__mc68040__) || defined(__mc68060__) ) \ + && !defined(__mcpu32__) // These variants support compare-and-swap. static inline _Atomic_word @@ -74,8 +75,7 @@ __exchange_and_add (volatile _Atomic_word *__mem, int __val) return __result; } -#elif !defined(__mcf5200__) && !defined(__mcf5300__) -// 68000, 68010, cpu32 and 5400 support test-and-set. +#else template <int __inst> struct __Atomicity_lock @@ -94,9 +94,26 @@ __exchange_and_add (volatile _Atomic_word *__mem, int __val) { _Atomic_word __result; +// bset with no immediate addressing +#if defined(__mcf5200__) || defined(__mcf5300__) || defined(__mcf5400__) + __asm__ __volatile__("1: bset.b #7,%0@\n\tjbne 1b" + : /* no outputs */ + : "a"(&__Atomicity_lock<0>::_S_atomicity_lock) + : "cc", "memory"); + +// bset with immediate addressing +#elif defined(__mc68000__) + __asm__ __volatile__("1: bset.b #7,%0\n\tjbne 1b" + : "+m"(__Atomicity_lock<0>::_S_atomicity_lock) + : /* none */ + : "cc"); + +#else // 680x0, cpu32, 5400 support test-and-set. __asm__ __volatile__("1: tas %0\n\tjbne 1b" - : "=m"(__Atomicity_lock<0>::_S_atomicity_lock) - : "m"(__Atomicity_lock<0>::_S_atomicity_lock)); + : "+m"(__Atomicity_lock<0>::_S_atomicity_lock) + : /* none */ + : "cc"); +#endif __result = *__mem; *__mem = __result + __val; @@ -106,45 +123,7 @@ __exchange_and_add (volatile _Atomic_word *__mem, int __val) return __result; } -#elif defined(__vxWorks__) || defined(__embedded__) -// The best we can hope for is to disable interrupts, which we -// can only do from supervisor mode. - -static inline _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 -// These variants do not support any atomic operations at all. - -#warning "__exchange_and_add is not atomic for this target" - -static inline _Atomic_word -__attribute__ ((__unused__)) -__exchange_and_add (volatile _Atomic_word *__mem, int __val) -{ - _Atomic_word __result; - - __result = *__mem; - *__mem = __result + __val; - - return __result; -} - -#endif /* CAS / IRQ / TAS */ +#endif /* TAS / BSET */ static inline void __attribute__ ((__unused__)) @@ -155,4 +134,4 @@ __atomic_add (volatile _Atomic_word* __mem, int __val) (void) __exchange_and_add (__mem, __val); } -#endif /* atomicity.h */ +#endif /* !_GLIBCXX_ATOMICITY_H */ |