forked from OSchip/llvm-project
118 lines
3.8 KiB
C++
118 lines
3.8 KiB
C++
//===-- sanitizer_atomic_clang_mips.h ---------------------------*- C++ -*-===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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 operations 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_release | 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_release | 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_release | 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_release | 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
|
|
|