diff options
Diffstat (limited to 'libc')
| -rw-r--r-- | libc/sysdeps/linux/arc/bits/atomic.h | 76 |
1 files changed, 74 insertions, 2 deletions
diff --git a/libc/sysdeps/linux/arc/bits/atomic.h b/libc/sysdeps/linux/arc/bits/atomic.h index 587860964..610b3c7c7 100644 --- a/libc/sysdeps/linux/arc/bits/atomic.h +++ b/libc/sysdeps/linux/arc/bits/atomic.h @@ -26,8 +26,10 @@ void __arc_link_error (void); #ifdef __A7__ #define atomic_full_barrier() __asm__ __volatile__("": : :"memory") +#define ARC_BARRIER_INSTR "" #else #define atomic_full_barrier() __asm__ __volatile__("dmb 3": : :"memory") +#define ARC_BARRIER_INSTR "dmb 3" #endif /* Atomic compare and exchange. */ @@ -38,11 +40,12 @@ void __arc_link_error (void); #define __arch_compare_and_exchange_val_16_acq(mem, newval, oldval) \ ({ __arc_link_error (); oldval; }) -#define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \ +#define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \ ({ __arc_link_error (); oldval; }) #ifdef __CONFIG_ARC_HAS_ATOMICS__ +#ifdef __A7__ #define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \ ({ \ __typeof(oldval) prev; \ @@ -60,8 +63,55 @@ void __arc_link_error (void); \ prev; \ }) +#else /* !__A7__ */ +#define USE_ATOMIC_COMPILER_BUILTINS 1 -#else +#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \ + ({ \ + __typeof(*mem) __oldval = (oldval); \ + __atomic_compare_exchange_n(mem, (void *) &__oldval, newval, 0, \ + __ATOMIC_ACQUIRE, __ATOMIC_RELAXED); \ + __oldval; \ + }) + +#define __arch_compare_and_exchange_val_8_rel(mem, newval, oldval) \ + ({ __arc_link_error (); oldval; }) + +#define __arch_compare_and_exchange_val_16_rel(mem, newval, oldval) \ + ({ __arc_link_error (); oldval; }) + +#define __arch_compare_and_exchange_val_64_rel(mem, newval, oldval) \ + ({ __arc_link_error (); oldval; }) + +#define __arch_compare_and_exchange_val_32_rel(mem, newval, oldval) \ + ({ \ + __typeof(*mem) __oldval = (oldval); \ + __atomic_compare_exchange_n(mem, (void *) &__oldval, newval, 0, \ + __ATOMIC_RELEASE, __ATOMIC_RELAXED); \ + __oldval; \ + }) + +/* Compare and exchange with "acquire" semantics, ie barrier after */ +#define atomic_compare_and_exchange_val_acq(mem, new, old) \ + __atomic_val_bysize(__arch_compare_and_exchange_val, acq, \ + mem, new, old) + +/* Compare and exchange with "release" semantics, ie barrier before */ +#define atomic_compare_and_exchange_val_rel(mem, new, old) \ + __atomic_val_bysize(__arch_compare_and_exchange_val, rel, \ + mem, new, old) + +/* Explicitly define here to use release semantics*/ +#define atomic_compare_and_exchange_bool_rel(mem, newval, oldval) \ + ({ \ + __typeof (oldval) __atg3_old = (oldval); \ + atomic_compare_and_exchange_val_rel (mem, newval, __atg3_old) \ + != __atg3_old; \ + }) + +#endif /* __A7__ */ + +#else /* !__CONFIG_ARC_HAS_ATOMICS__ */ #ifndef __NR_arc_usr_cmpxchg #error "__NR_arc_usr_cmpxchg missing: Please upgrade to kernel 4.9+ headers" @@ -101,6 +151,21 @@ void __arc_link_error (void); __typeof__(*(mem)) val = newval; \ \ __asm__ __volatile__( \ + "ex %0, [%1]\n" \ + ARC_BARRIER_INSTR \ + : "+r" (val) \ + : "r" (mem) \ + : "memory" ); \ + \ + val; \ + }) + +#define __arch_exchange_32_rel(mem, newval) \ + ({ \ + __typeof__(*(mem)) val = newval; \ + \ + __asm__ __volatile__( \ + ARC_BARRIER_INSTR"\n" \ "ex %0, [%1]" \ : "+r" (val) \ : "r" (mem) \ @@ -115,3 +180,10 @@ void __arc_link_error (void); abort(); \ __arch_exchange_32_acq(mem, newval); \ }) + +#define atomic_exchange_rel(mem, newval) \ + ({ \ + if (sizeof(*(mem)) != 4) \ + abort(); \ + __arch_exchange_32_rel(mem, newval); \ + }) |