diff options
Diffstat (limited to 'libstdc++-v3/config/cpu/m68k/atomicity.h')
| -rw-r--r-- | libstdc++-v3/config/cpu/m68k/atomicity.h | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/libstdc++-v3/config/cpu/m68k/atomicity.h b/libstdc++-v3/config/cpu/m68k/atomicity.h index d33bbef6dd9..c4ce17dac67 100644 --- a/libstdc++-v3/config/cpu/m68k/atomicity.h +++ b/libstdc++-v3/config/cpu/m68k/atomicity.h @@ -94,22 +94,25 @@ __exchange_and_add (volatile _Atomic_word *__mem, int __val) { _Atomic_word __result; -// bset with no immediate addressing -#if defined(__mcf5200__) || defined(__mcf5300__) || defined(__mcf5400__) +// bset with no immediate addressing (not SMP-safe) +#if defined(__mcf5200__) || defined(__mcf5300__) __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" +// CPU32 and MCF5400 support test-and-set (SMP-safe). +#elif defined(__mcpu32__) || defined(__mcf5400__) + __asm__ __volatile__("1: tas %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" +// 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"); |
