1 __attribute__((__visibility__("hidden")))
2 extern const void *__arm_atomics[3]; /* gettp, cas, barrier */
4 #if ((__ARM_ARCH_6__ || __ARM_ARCH_6K__ || __ARM_ARCH_6ZK__) && !__thumb__) \
5 || __ARM_ARCH_7A__ || __ARM_ARCH_7R__ || __ARM_ARCH >= 7
8 static inline int a_ll(volatile int *p)
11 __asm__ __volatile__ ("ldrex %0, %1" : "=r"(v) : "Q"(*p));
16 static inline int a_sc(volatile int *p, int v)
19 __asm__ __volatile__ ("strex %0,%2,%1" : "=&r"(r), "=Q"(*p) : "r"(v) : "memory");
23 #if __ARM_ARCH_7A__ || __ARM_ARCH_7R__ || __ARM_ARCH >= 7
25 #define a_barrier a_barrier
26 static inline void a_barrier()
28 __asm__ __volatile__ ("dmb ish" : : : "memory");
33 #define a_pre_llsc a_barrier
34 #define a_post_llsc a_barrier
39 static inline int a_cas(volatile int *p, int t, int s)
42 register int r0 __asm__("r0") = t;
43 register int r1 __asm__("r1") = s;
44 register volatile int *r2 __asm__("r2") = p;
46 __asm__ __volatile__ (
48 : "+r"(r0) : "r"(r1), "r"(r2)
49 : "memory", "r3", "lr", "ip", "cc" );
51 if ((old=*p)!=t) return old;
58 #define a_barrier a_barrier
59 static inline void a_barrier()
61 __asm__ __volatile__("bl __a_barrier"
62 : : : "memory", "cc", "ip", "lr" );
66 #define a_crash a_crash
67 static inline void a_crash()