diff --git a/libc/private/bionic_atomic_inline.h b/libc/private/bionic_atomic_inline.h index 821ad396f..0b348c3f1 100644 --- a/libc/private/bionic_atomic_inline.h +++ b/libc/private/bionic_atomic_inline.h @@ -53,6 +53,8 @@ extern "C" { # include #elif defined(__i386__) # include +#elif defined(__mips__) +# include #else # include #endif diff --git a/libc/private/bionic_atomic_mips.h b/libc/private/bionic_atomic_mips.h new file mode 100644 index 000000000..28fe88dd0 --- /dev/null +++ b/libc/private/bionic_atomic_mips.h @@ -0,0 +1,102 @@ +/* + * 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_MIPS_H +#define BIONIC_ATOMIC_MIPS_H + +/* Define a full memory barrier, this is only needed if we build the + * platform for a multi-core device. + */ +#if defined(ANDROID_SMP) && ANDROID_SMP == 1 +__ATOMIC_INLINE__ void +__bionic_memory_barrier() +{ + __asm__ __volatile__ ( "sync" : : : "memory" ); +} +#else +__ATOMIC_INLINE__ void +__bionic_memory_barrier() +{ + /* 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; + __asm__ __volatile__ ("1: move %[status], %[new_value] \n" + " ll %[prev], 0(%[ptr]) \n" + " bne %[old_value], %[prev], 2f \n" + " sc %[status], 0(%[ptr]) \n" + " beqz %[status], 1b \n" + "2: \n" + : [prev]"=&r"(prev), [status]"=&r"(status), "+m"(*ptr) + : [new_value]"r"(new_value), [old_value]"r"(old_value), [ptr]"r"(ptr) + : "memory"); + 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; + __asm__ __volatile__ ("1: move %[status], %[new_value] \n" + " ll %[prev], 0(%[ptr]) \n" + " sc %[status], 0(%[ptr]) \n" + " beqz %[status], 1b \n" + : [prev]"=&r"(prev), [status]"=&r"(status), "+m"(*ptr) + : [ptr]"r"(ptr), [new_value]"r"(new_value) + : "memory"); + return prev; +} + +/* Atomic increment, without explicit barriers */ +__ATOMIC_INLINE__ int32_t +__bionic_atomic_inc(volatile int32_t *ptr) +{ + int32_t prev, status; + __asm__ __volatile__ ("1: ll %[prev], 0(%[ptr]) \n" + " addiu %[status], %[prev], 1 \n" + " sc %[status], 0(%[ptr]) \n" + " beqz %[status], 1b \n" + : [prev]"=&r" (prev), [status]"=&r"(status), "+m" (*ptr) + : [ptr]"r"(ptr) + : "memory"); + return prev; +} + +/* Atomic decrement, without explicit barriers */ +__ATOMIC_INLINE__ int32_t +__bionic_atomic_dec(volatile int32_t *ptr) +{ + int32_t prev, status; + __asm__ __volatile__ ("1: ll %[prev], 0(%[ptr]) \n" + " addiu %[status], %[prev], -1 \n" + " sc %[status], 0(%[ptr]) \n" + " beqz %[status], 1b \n" + : [prev]"=&r" (prev), [status]"=&r"(status), "+m" (*ptr) + : [ptr]"r"(ptr) + : "memory"); + return prev; +} +#endif /* BIONIC_ATOMIC_MIPS_H */