diff options
Diffstat (limited to 'lib/sanitizer_common/sanitizer_atomic_clang_mips.h')
-rw-r--r-- | lib/sanitizer_common/sanitizer_atomic_clang_mips.h | 118 |
1 files changed, 0 insertions, 118 deletions
diff --git a/lib/sanitizer_common/sanitizer_atomic_clang_mips.h b/lib/sanitizer_common/sanitizer_atomic_clang_mips.h deleted file mode 100644 index c64e6e542..000000000 --- a/lib/sanitizer_common/sanitizer_atomic_clang_mips.h +++ /dev/null @@ -1,118 +0,0 @@ -//===-- sanitizer_atomic_clang_mips.h ---------------------------*- C++ -*-===// -// -// The LLVM Compiler Infrastructure -// -// This file is distributed under the University of Illinois Open Source -// License. See LICENSE.TXT for details. -// -//===----------------------------------------------------------------------===// -// -// This file is a part of ThreadSanitizer/AddressSanitizer runtime. -// Not intended for direct inclusion. Include sanitizer_atomic.h. -// -//===----------------------------------------------------------------------===// - -#ifndef SANITIZER_ATOMIC_CLANG_MIPS_H -#define SANITIZER_ATOMIC_CLANG_MIPS_H - -namespace __sanitizer { - -// MIPS32 does not support atomics > 4 bytes. To address this lack of -// functionality, the sanitizer library provides helper methods which use an -// internal spin lock mechanism to emulate atomic oprations when the size is -// 8 bytes. -static void __spin_lock(volatile int *lock) { - while (__sync_lock_test_and_set(lock, 1)) - while (*lock) { - } -} - -static void __spin_unlock(volatile int *lock) { __sync_lock_release(lock); } - -// Make sure the lock is on its own cache line to prevent false sharing. -// Put it inside a struct that is aligned and padded to the typical MIPS -// cacheline which is 32 bytes. -static struct { - int lock; - char pad[32 - sizeof(int)]; -} __attribute__((aligned(32))) lock = {0, {0}}; - -template <> -INLINE atomic_uint64_t::Type atomic_fetch_add(volatile atomic_uint64_t *ptr, - atomic_uint64_t::Type val, - memory_order mo) { - DCHECK(mo & - (memory_order_relaxed | memory_order_releasae | memory_order_seq_cst)); - DCHECK(!((uptr)ptr % sizeof(*ptr))); - - atomic_uint64_t::Type ret; - - __spin_lock(&lock.lock); - ret = *(const_cast<atomic_uint64_t::Type volatile *>(&ptr->val_dont_use)); - ptr->val_dont_use = ret + val; - __spin_unlock(&lock.lock); - - return ret; -} - -template <> -INLINE atomic_uint64_t::Type atomic_fetch_sub(volatile atomic_uint64_t *ptr, - atomic_uint64_t::Type val, - memory_order mo) { - return atomic_fetch_add(ptr, -val, mo); -} - -template <> -INLINE bool atomic_compare_exchange_strong(volatile atomic_uint64_t *ptr, - atomic_uint64_t::Type *cmp, - atomic_uint64_t::Type xchg, - memory_order mo) { - DCHECK(mo & - (memory_order_relaxed | memory_order_releasae | memory_order_seq_cst)); - DCHECK(!((uptr)ptr % sizeof(*ptr))); - - typedef atomic_uint64_t::Type Type; - Type cmpv = *cmp; - Type prev; - bool ret = false; - - __spin_lock(&lock.lock); - prev = *(const_cast<Type volatile *>(&ptr->val_dont_use)); - if (prev == cmpv) { - ret = true; - ptr->val_dont_use = xchg; - } - __spin_unlock(&lock.lock); - - return ret; -} - -template <> -INLINE atomic_uint64_t::Type atomic_load(const volatile atomic_uint64_t *ptr, - memory_order mo) { - DCHECK(mo & - (memory_order_relaxed | memory_order_releasae | memory_order_seq_cst)); - DCHECK(!((uptr)ptr % sizeof(*ptr))); - - atomic_uint64_t::Type zero = 0; - volatile atomic_uint64_t *Newptr = - const_cast<volatile atomic_uint64_t *>(ptr); - return atomic_fetch_add(Newptr, zero, mo); -} - -template <> -INLINE void atomic_store(volatile atomic_uint64_t *ptr, atomic_uint64_t::Type v, - memory_order mo) { - DCHECK(mo & - (memory_order_relaxed | memory_order_releasae | memory_order_seq_cst)); - DCHECK(!((uptr)ptr % sizeof(*ptr))); - - __spin_lock(&lock.lock); - ptr->val_dont_use = v; - __spin_unlock(&lock.lock); -} - -} // namespace __sanitizer - -#endif // SANITIZER_ATOMIC_CLANG_MIPS_H - |