added SuperH atomic support to libcutils
diff --git a/libcutils/Android.mk b/libcutils/Android.mk
index 98e59ee..30f4a49 100644
--- a/libcutils/Android.mk
+++ b/libcutils/Android.mk
@@ -98,7 +98,11 @@
ifeq ($(TARGET_ARCH),arm)
LOCAL_SRC_FILES += memset32.S atomic-android-arm.S
else # !arm
+ifeq ($(TARGET_ARCH),sh)
+LOCAL_SRC_FILES += memory.c atomic-android-sh.c
+else # !sh
LOCAL_SRC_FILES += memory.c
+endif # !sh
endif # !arm
LOCAL_C_INCLUDES := $(KERNEL_HEADERS)
diff --git a/libcutils/atomic-android-sh.c b/libcutils/atomic-android-sh.c
new file mode 100644
index 0000000..acbea97
--- /dev/null
+++ b/libcutils/atomic-android-sh.c
@@ -0,0 +1,159 @@
+/*
+ * Copyright (C) 2007 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.
+ */
+
+#include <cutils/atomic.h>
+#ifdef HAVE_WIN32_THREADS
+#include <windows.h>
+#else
+#include <sched.h>
+#endif
+
+/*
+ * Note :
+ *
+ * (1) SuperH does not have CMPXCHG. It has only TAS for atomic
+ * operations. It does not seem a good idea to implement CMPXCHG,
+ * with TAS. So, we choose to implemnt these operations with
+ * posix mutexes. Please be sure that this might cause performance
+ * problem for Android-SH. Using LL/SC instructions supported in SH-X3,
+ * best performnace would be realized.
+ *
+ * (2) Mutex initialization problem happens, which is commented for
+ * ARM implementation, in this file above.
+ * We follow the fact that the initializer for mutex is a simple zero
+ * value.
+ */
+
+#include <pthread.h>
+
+#define SWAP_LOCK_COUNT 32U
+static pthread_mutex_t _swap_locks[SWAP_LOCK_COUNT];
+
+#define SWAP_LOCK(addr) \
+ &_swap_locks[((unsigned)(void*)(addr) >> 3U) % SWAP_LOCK_COUNT]
+
+
+void android_atomic_write(int32_t value, volatile int32_t* addr) {
+ int32_t oldValue;
+ do {
+ oldValue = *addr;
+ } while (android_atomic_cmpxchg(oldValue, value, addr));
+}
+
+int32_t android_atomic_inc(volatile int32_t* addr) {
+ int32_t oldValue;
+ do {
+ oldValue = *addr;
+ } while (android_atomic_cmpxchg(oldValue, oldValue+1, addr));
+ return oldValue;
+}
+
+int32_t android_atomic_dec(volatile int32_t* addr) {
+ int32_t oldValue;
+ do {
+ oldValue = *addr;
+ } while (android_atomic_cmpxchg(oldValue, oldValue-1, addr));
+ return oldValue;
+}
+
+int32_t android_atomic_add(int32_t value, volatile int32_t* addr) {
+ int32_t oldValue;
+ do {
+ oldValue = *addr;
+ } while (android_atomic_cmpxchg(oldValue, oldValue+value, addr));
+ return oldValue;
+}
+
+int32_t android_atomic_and(int32_t value, volatile int32_t* addr) {
+ int32_t oldValue;
+ do {
+ oldValue = *addr;
+ } while (android_atomic_cmpxchg(oldValue, oldValue&value, addr));
+ return oldValue;
+}
+
+int32_t android_atomic_or(int32_t value, volatile int32_t* addr) {
+ int32_t oldValue;
+ do {
+ oldValue = *addr;
+ } while (android_atomic_cmpxchg(oldValue, oldValue|value, addr));
+ return oldValue;
+}
+
+int32_t android_atomic_swap(int32_t value, volatile int32_t* addr) {
+ int32_t oldValue;
+ do {
+ oldValue = *addr;
+ } while (android_atomic_cmpxchg(oldValue, value, addr));
+ return oldValue;
+}
+
+int android_atomic_cmpxchg(int32_t oldvalue, int32_t newvalue,
+ volatile int32_t* addr) {
+ int result;
+ pthread_mutex_t* lock = SWAP_LOCK(addr);
+
+ pthread_mutex_lock(lock);
+
+ if (*addr == oldvalue) {
+ *addr = newvalue;
+ result = 0;
+ } else {
+ result = 1;
+ }
+ pthread_mutex_unlock(lock);
+ return result;
+}
+
+int64_t android_quasiatomic_swap_64(int64_t value, volatile int64_t* addr) {
+ int64_t oldValue;
+ pthread_mutex_t* lock = SWAP_LOCK(addr);
+
+ pthread_mutex_lock(lock);
+
+ oldValue = *addr;
+ *addr = value;
+
+ pthread_mutex_unlock(lock);
+ return oldValue;
+}
+
+int android_quasiatomic_cmpxchg_64(int64_t oldvalue, int64_t newvalue,
+ volatile int64_t* addr) {
+ int result;
+ pthread_mutex_t* lock = SWAP_LOCK(addr);
+
+ pthread_mutex_lock(lock);
+
+ if (*addr == oldvalue) {
+ *addr = newvalue;
+ result = 0;
+ } else {
+ result = 1;
+ }
+ pthread_mutex_unlock(lock);
+ return result;
+}
+
+int64_t android_quasiatomic_read_64(volatile int64_t* addr) {
+ int64_t result;
+ pthread_mutex_t* lock = SWAP_LOCK(addr);
+
+ pthread_mutex_lock(lock);
+ result = *addr;
+ pthread_mutex_unlock(lock);
+ return result;
+}
diff --git a/libcutils/atomic.c b/libcutils/atomic.c
index 65d7af0..41faaa2 100644
--- a/libcutils/atomic.c
+++ b/libcutils/atomic.c
@@ -245,6 +245,10 @@
return result;
}
+/*****************************************************************************/
+#elif __sh__
+// implementation for SuperH is in atomic-android-sh.c.
+
#else
#error "Unsupported atomic operations for this platform"