diff options
Diffstat (limited to 'libc/private/bionic_atomic_arm.h')
-rw-r--r-- | libc/private/bionic_atomic_arm.h | 79 |
1 files changed, 0 insertions, 79 deletions
diff --git a/libc/private/bionic_atomic_arm.h b/libc/private/bionic_atomic_arm.h deleted file mode 100644 index 2156e6a..0000000 --- a/libc/private/bionic_atomic_arm.h +++ /dev/null @@ -1,79 +0,0 @@ -/* - * Copyright (C) 2011 The Android Open Source Project - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ -#ifndef BIONIC_ATOMIC_ARM_H -#define BIONIC_ATOMIC_ARM_H - -__ATOMIC_INLINE__ void __bionic_memory_barrier() { -#if defined(ANDROID_SMP) && ANDROID_SMP == 1 - __asm__ __volatile__ ( "dmb ish" : : : "memory" ); -#else - /* A simple compiler barrier. */ - __asm__ __volatile__ ( "" : : : "memory" ); -#endif -} - -/* Compare-and-swap, without any explicit barriers. Note that this function - * returns 0 on success, and 1 on failure. The opposite convention is typically - * used on other platforms. - */ -__ATOMIC_INLINE__ int __bionic_cmpxchg(int32_t old_value, int32_t new_value, volatile int32_t* ptr) { - int32_t prev, status; - do { - __asm__ __volatile__ ( - "ldrex %0, [%3]\n" - "mov %1, #0\n" - "teq %0, %4\n" -#ifdef __thumb2__ - "it eq\n" -#endif - "strexeq %1, %5, [%3]" - : "=&r" (prev), "=&r" (status), "+m"(*ptr) - : "r" (ptr), "Ir" (old_value), "r" (new_value) - : "cc"); - } while (__builtin_expect(status != 0, 0)); - return prev != old_value; -} - -/* Swap, without any explicit barriers. */ -__ATOMIC_INLINE__ int32_t __bionic_swap(int32_t new_value, volatile int32_t* ptr) { - int32_t prev, status; - do { - __asm__ __volatile__ ( - "ldrex %0, [%3]\n" - "strex %1, %4, [%3]" - : "=&r" (prev), "=&r" (status), "+m" (*ptr) - : "r" (ptr), "r" (new_value) - : "cc"); - } while (__builtin_expect(status != 0, 0)); - return prev; -} - -/* Atomic decrement, without explicit barriers. */ -__ATOMIC_INLINE__ int32_t __bionic_atomic_dec(volatile int32_t* ptr) { - int32_t prev, tmp, status; - do { - __asm__ __volatile__ ( - "ldrex %0, [%4]\n" - "sub %1, %0, #1\n" - "strex %2, %1, [%4]" - : "=&r" (prev), "=&r" (tmp), "=&r" (status), "+m"(*ptr) - : "r" (ptr) - : "cc"); - } while (__builtin_expect(status != 0, 0)); - return prev; -} - -#endif /* SYS_ATOMICS_ARM_H */ |