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
return __result;
}
-#elif !defined(__mcf5200__) && !defined(__mcf5300__)
-// 68000, 68010, cpu32 and 5400 support test-and-set.
+#else
template <int __inst>
struct __Atomicity_lock
{
_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;
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__))
(void) __exchange_and_add (__mem, __val);
}
-#endif /* atomicity.h */
+#endif /* !_GLIBCXX_ATOMICITY_H */