diff options
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/i386/i486/bits/atomic.h | 7 | ||||
| -rw-r--r-- | sysdeps/x86_64/bits/atomic.h | 7 |
2 files changed, 14 insertions, 0 deletions
diff --git a/sysdeps/i386/i486/bits/atomic.h b/sysdeps/i386/i486/bits/atomic.h index 01c2b942b3..59165bec94 100644 --- a/sysdeps/i386/i486/bits/atomic.h +++ b/sysdeps/i386/i486/bits/atomic.h @@ -535,3 +535,10 @@ typedef uintmax_t uatomic_max_t; #define atomic_or(mem, mask) __arch_or_body (LOCK_PREFIX, mem, mask) #define catomic_or(mem, mask) __arch_or_body (__arch_cprefix, mem, mask) + +/* We don't use mfence because it is supposedly slower due to having to + provide stronger guarantees (e.g., regarding self-modifying code). */ +#define atomic_full_barrier() \ + __asm __volatile (LOCK_PREFIX "orl $0, (%%esp)" ::: "memory") +#define atomic_read_barrier() __asm ("" ::: "memory") +#define atomic_write_barrier() __asm ("" ::: "memory") diff --git a/sysdeps/x86_64/bits/atomic.h b/sysdeps/x86_64/bits/atomic.h index 5d08146cd7..203d92c20d 100644 --- a/sysdeps/x86_64/bits/atomic.h +++ b/sysdeps/x86_64/bits/atomic.h @@ -472,3 +472,10 @@ typedef uintmax_t uatomic_max_t; #define atomic_or(mem, mask) __arch_or_body (LOCK_PREFIX, mem, mask) #define catomic_or(mem, mask) __arch_or_body (__arch_cprefix, mem, mask) + +/* We don't use mfence because it is supposedly slower due to having to + provide stronger guarantees (e.g., regarding self-modifying code). */ +#define atomic_full_barrier() \ + __asm __volatile (LOCK_PREFIX "orl $0, (%%rsp)" ::: "memory") +#define atomic_read_barrier() __asm ("" ::: "memory") +#define atomic_write_barrier() __asm ("" ::: "memory") |