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re PR libstdc++/11784 (atomic __exchange_and_add() broken for ColdFire and 68000 targets.)

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2003-08-07  Bernardo Innocenti  <bernie@develer.com>

	PR libstdc++/11784
	* libstdc++-v3/config/cpu/m68k/atomicity.h (__exchange_and_add):
	Replace variants with new BSET-based version.

From-SVN: r70230
This commit is contained in:
Bernardo Innocenti 2003-08-07 22:53:57 +02:00 committed by Benjamin Kosnik
parent a9ebaa2b6d
commit 4e9ebd4bc8
2 changed files with 31 additions and 46 deletions
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6
libstdc++-v3/ChangeLog
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@ -1,3 +1,9 @@
2003-08-07 Bernardo Innocenti <bernie@develer.com>
PR libstdc++/11784
* libstdc++-v3/config/cpu/m68k/atomicity.h (__exchange_and_add):
Replace variants with new BSET-based version.
2003-08-07 Carlo Wood <carlo@alinoe.com>
* include/bits/demangle.h: Do not use cctype functions that depend

71
libstdc++-v3/config/cpu/m68k/atomicity.h
View File

@ -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 */