diff options
Diffstat (limited to 'arch/arm/atomic_arch.h')
| -rw-r--r-- | arch/arm/atomic_arch.h | 21 |
1 files changed, 14 insertions, 7 deletions
diff --git a/arch/arm/atomic_arch.h b/arch/arm/atomic_arch.h index 706fa1f2..d6af84d0 100644 --- a/arch/arm/atomic_arch.h +++ b/arch/arm/atomic_arch.h @@ -1,5 +1,11 @@ -__attribute__((__visibility__("hidden"))) -extern const void *__arm_atomics[3]; /* gettp, cas, barrier */ +#if __ARM_ARCH_4__ || __ARM_ARCH_4T__ || __ARM_ARCH == 4 +#define BLX "mov lr,pc\n\tbx" +#else +#define BLX "blx" +#endif + +extern uintptr_t __attribute__((__visibility__("hidden"))) + __a_cas_ptr, __a_barrier_ptr; #if ((__ARM_ARCH_6__ || __ARM_ARCH_6K__ || __ARM_ARCH_6ZK__) && !__thumb__) \ || __ARM_ARCH_7A__ || __ARM_ARCH_7R__ || __ARM_ARCH >= 7 @@ -42,11 +48,12 @@ static inline int a_cas(volatile int *p, int t, int s) register int r0 __asm__("r0") = t; register int r1 __asm__("r1") = s; register volatile int *r2 __asm__("r2") = p; + register uintptr_t r3 __asm__("r3") = __a_cas_ptr; int old; __asm__ __volatile__ ( - "bl __a_cas" - : "+r"(r0) : "r"(r1), "r"(r2) - : "memory", "r3", "lr", "ip", "cc" ); + BLX " r3" + : "+r"(r0), "+r"(r3) : "r"(r1), "r"(r2) + : "memory", "lr", "ip", "cc" ); if (!r0) return t; if ((old=*p)!=t) return old; } @@ -58,8 +65,8 @@ static inline int a_cas(volatile int *p, int t, int s) #define a_barrier a_barrier static inline void a_barrier() { - __asm__ __volatile__("bl __a_barrier" - : : : "memory", "cc", "ip", "lr" ); + register uintptr_t ip __asm__("ip") = __a_barrier_ptr; + __asm__ __volatile__( BLX " ip" : "+r"(ip) : : "memory", "cc", "lr" ); } #endif |