diff options
Diffstat (limited to 'config/cpu/m68k/atomicity.h')
| -rw-r--r-- | config/cpu/m68k/atomicity.h | 109 |
1 files changed, 55 insertions, 54 deletions
diff --git a/config/cpu/m68k/atomicity.h b/config/cpu/m68k/atomicity.h index eb801de..8b224e2 100644 --- a/config/cpu/m68k/atomicity.h +++ b/config/cpu/m68k/atomicity.h @@ -28,112 +28,113 @@ // the GNU General Public License. #ifndef _GLIBCXX_ATOMICITY_H -#define _GLIBCXX_ATOMICITY_H 1 +#define _GLIBCXX_ATOMICITY_H 1 typedef int _Atomic_word; #if ( defined(__mc68020__) || defined(__mc68030__) \ - || defined(__mc68040__) || defined(__mc68060__) ) \ - && !defined(__mcpu32__) + || defined(__mc68040__) || defined(__mc68060__) ) \ + && !defined(__mcpu32__) // These variants support compare-and-swap. -static inline _Atomic_word +static inline _Atomic_word __attribute__ ((__unused__)) -__exchange_and_add(volatile _Atomic_word* __mem, int __val) +__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; + 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. - */ +/* + * TAS/JBNE is unsafe on systems with strict priority-based scheduling. + * Disable interrupts, which we can do only from supervisor mode. + */ static inline _Atomic_word __attribute__ ((__unused__)) -__exchange_and_add(volatile _Atomic_word* __mem, int __val) +__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)); + _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; + __result = *__mem; + *__mem = __result + __val; - __asm__ __volatile__ ("move%.w %0,%%sr" : : "d"(__level)); + __asm__ __volatile__ ("move%.w %0,%%sr" : : "d" (__level)); - return __result; + return __result; } #else template<int __inst> - struct __Atomicity_lock - { - static volatile unsigned char _S_atomicity_lock; - }; +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; -static inline _Atomic_word +static inline _Atomic_word __attribute__ ((__unused__)) -__exchange_and_add(volatile _Atomic_word* __mem, int __val) +__exchange_and_add (volatile _Atomic_word* __mem, int __val) { - _Atomic_word __result; + _Atomic_word __result; // 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"); + __asm__ __volatile__ ("1: bset.b #7,%0@\n\tjbne 1b" + : /* no outputs */ + : "a" (&__Atomicity_lock<0>::_S_atomicity_lock) + : "cc", "memory"); // 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"); + __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"); + __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; + __result = *__mem; + *__mem = __result + __val; - __Atomicity_lock<0>::_S_atomicity_lock = 0; + __Atomicity_lock<0>::_S_atomicity_lock = 0; - return __result; + return __result; } #endif /* TAS / BSET */ static inline void __attribute__ ((__unused__)) -__atomic_add(volatile _Atomic_word* __mem, int __val) +__atomic_add (volatile _Atomic_word* __mem, int __val) { - // Careful: using add.l with a memory destination is not - // architecturally guaranteed to be atomic. - (void) __exchange_and_add(__mem, __val); + // Careful: using add.l with a memory destination is not + // architecturally guaranteed to be atomic. + (void)__exchange_and_add (__mem, __val); } #endif /* !_GLIBCXX_ATOMICITY_H */ |