diff --git a/Android.mk b/Android.mk
index 3467f1d..a2cc092 100644
--- a/Android.mk
+++ b/Android.mk
@@ -93,13 +93,18 @@
 ART_HOST_DEPENDENCIES := \
 	$(ART_HOST_EXECUTABLES) \
 	$(HOST_OUT_JAVA_LIBRARIES)/core-libart-hostdex.jar \
-	$(ART_HOST_OUT_SHARED_LIBRARIES)/libjavacore$(ART_HOST_SHLIB_EXTENSION)
+	$(HOST_OUT_JAVA_LIBRARIES)/core-oj-hostdex.jar \
+	$(ART_HOST_OUT_SHARED_LIBRARIES)/libjavacore$(ART_HOST_SHLIB_EXTENSION) \
+	$(ART_HOST_OUT_SHARED_LIBRARIES)/libxxavacore$(ART_HOST_SHLIB_EXTENSION)
 ART_TARGET_DEPENDENCIES := \
 	$(ART_TARGET_EXECUTABLES) \
 	$(TARGET_OUT_JAVA_LIBRARIES)/core-libart.jar \
-	$(TARGET_OUT_SHARED_LIBRARIES)/libjavacore.so
+	$(TARGET_OUT_JAVA_LIBRARIES)/core-oj.jar \
+	$(TARGET_OUT_SHARED_LIBRARIES)/libjavacore.so \
+	$(TARGET_OUT_SHARED_LIBRARIES)/libxxavacore.so
 ifdef TARGET_2ND_ARCH
 ART_TARGET_DEPENDENCIES += $(2ND_TARGET_OUT_SHARED_LIBRARIES)/libjavacore.so
+ART_TARGET_DEPENDENCIES += $(2ND_TARGET_OUT_SHARED_LIBRARIES)/libxxavacore.so
 endif
 ifdef HOST_2ND_ARCH
 ART_HOST_DEPENDENCIES += $(2ND_HOST_OUT_SHARED_LIBRARIES)/libjavacore.so
diff --git a/build/Android.common_path.mk b/build/Android.common_path.mk
index b9a449c..8c2e7f9 100644
--- a/build/Android.common_path.mk
+++ b/build/Android.common_path.mk
@@ -80,7 +80,7 @@
 TARGET_CORE_IMG_LOCATION := $(ART_TARGET_TEST_OUT)/core.art
 
 # Jar files for core.art.
-TARGET_CORE_JARS := core-libart conscrypt okhttp core-junit bouncycastle
+TARGET_CORE_JARS := core-oj core-libart conscrypt okhttp core-junit bouncycastle
 HOST_CORE_JARS := $(addsuffix -hostdex,$(TARGET_CORE_JARS))
 
 HOST_CORE_DEX_LOCATIONS   := $(foreach jar,$(HOST_CORE_JARS),  $(HOST_OUT_JAVA_LIBRARIES)/$(jar).jar)
diff --git a/compiler/image_test.cc b/compiler/image_test.cc
index 772cc80..dd1d744 100644
--- a/compiler/image_test.cc
+++ b/compiler/image_test.cc
@@ -143,7 +143,7 @@
   java_lang_dex_file_ = nullptr;
 
   MemMap::Init();
-  std::unique_ptr<const DexFile> dex(LoadExpectSingleDexFile(GetLibCoreDexFileName().c_str()));
+  std::unique_ptr<const DexFile> dex(LoadExpectSingleDexFile(GetLibCoreDexFileNames()[0].c_str()));
 
   RuntimeOptions options;
   std::string image("-Ximage:");
diff --git a/runtime/Android.mk b/runtime/Android.mk
index b38f9bc..41cd3d2 100644
--- a/runtime/Android.mk
+++ b/runtime/Android.mk
@@ -141,6 +141,7 @@
   native/libcore_util_CharsetUtils.cc \
   native/org_apache_harmony_dalvik_ddmc_DdmServer.cc \
   native/org_apache_harmony_dalvik_ddmc_DdmVmInternal.cc \
+  native/OpenjdkJvm.cc \
   native/sun_misc_Unsafe.cc \
   oat.cc \
   oat_file.cc \
diff --git a/runtime/asm_support.h b/runtime/asm_support.h
index 10ed0f4..685e771 100644
--- a/runtime/asm_support.h
+++ b/runtime/asm_support.h
@@ -132,16 +132,16 @@
 ADD_TEST_EQ(size_t(MIRROR_OBJECT_HEADER_SIZE), sizeof(art::mirror::Object))
 
 // Offsets within java.lang.Class.
-#define MIRROR_CLASS_COMPONENT_TYPE_OFFSET (4 + MIRROR_OBJECT_HEADER_SIZE)
+#define MIRROR_CLASS_COMPONENT_TYPE_OFFSET (8 + MIRROR_OBJECT_HEADER_SIZE)
 ADD_TEST_EQ(MIRROR_CLASS_COMPONENT_TYPE_OFFSET,
             art::mirror::Class::ComponentTypeOffset().Int32Value())
-#define MIRROR_CLASS_ACCESS_FLAGS_OFFSET (36 + MIRROR_OBJECT_HEADER_SIZE)
+#define MIRROR_CLASS_ACCESS_FLAGS_OFFSET (72 + MIRROR_OBJECT_HEADER_SIZE)
 ADD_TEST_EQ(MIRROR_CLASS_ACCESS_FLAGS_OFFSET,
             art::mirror::Class::AccessFlagsOffset().Int32Value())
-#define MIRROR_CLASS_OBJECT_SIZE_OFFSET (112 + MIRROR_OBJECT_HEADER_SIZE)
+#define MIRROR_CLASS_OBJECT_SIZE_OFFSET (116 + MIRROR_OBJECT_HEADER_SIZE)
 ADD_TEST_EQ(MIRROR_CLASS_OBJECT_SIZE_OFFSET,
             art::mirror::Class::ObjectSizeOffset().Int32Value())
-#define MIRROR_CLASS_STATUS_OFFSET (124 + MIRROR_OBJECT_HEADER_SIZE)
+#define MIRROR_CLASS_STATUS_OFFSET (128 + MIRROR_OBJECT_HEADER_SIZE)
 ADD_TEST_EQ(MIRROR_CLASS_STATUS_OFFSET,
             art::mirror::Class::StatusOffset().Int32Value())
 
diff --git a/runtime/class_linker.cc b/runtime/class_linker.cc
index 9ca6492..6e7d8e5 100644
--- a/runtime/class_linker.cc
+++ b/runtime/class_linker.cc
@@ -3443,7 +3443,7 @@
 
 void ClassLinker::CreateProxyConstructor(Handle<mirror::Class> klass, ArtMethod* out) {
   // Create constructor for Proxy that must initialize the method.
-  CHECK_EQ(GetClassRoot(kJavaLangReflectProxy)->NumDirectMethods(), 16u);
+  CHECK_EQ(GetClassRoot(kJavaLangReflectProxy)->NumDirectMethods(), 19u);
   ArtMethod* proxy_constructor = GetClassRoot(kJavaLangReflectProxy)->GetDirectMethodUnchecked(
       2, image_pointer_size_);
   // Ensure constructor is in dex cache so that we can use the dex cache to look up the overridden
diff --git a/runtime/class_linker_test.cc b/runtime/class_linker_test.cc
index a4e0227..7648a4f 100644
--- a/runtime/class_linker_test.cc
+++ b/runtime/class_linker_test.cc
@@ -488,6 +488,7 @@
 struct ClassOffsets : public CheckOffsets<mirror::Class> {
   ClassOffsets() : CheckOffsets<mirror::Class>(false, "Ljava/lang/Class;") {
     addOffset(OFFSETOF_MEMBER(mirror::Class, access_flags_), "accessFlags");
+    addOffset(OFFSETOF_MEMBER(mirror::Class, annotation_type_), "annotationType");
     addOffset(OFFSETOF_MEMBER(mirror::Class, class_loader_), "classLoader");
     addOffset(OFFSETOF_MEMBER(mirror::Class, class_size_), "classSize");
     addOffset(OFFSETOF_MEMBER(mirror::Class, clinit_thread_id_), "clinitThreadId");
@@ -524,15 +525,15 @@
 struct StringOffsets : public CheckOffsets<mirror::String> {
   StringOffsets() : CheckOffsets<mirror::String>(false, "Ljava/lang/String;") {
     addOffset(OFFSETOF_MEMBER(mirror::String, count_), "count");
-    addOffset(OFFSETOF_MEMBER(mirror::String, hash_code_), "hashCode");
+    addOffset(OFFSETOF_MEMBER(mirror::String, hash_code_), "hash");
   };
 };
 
 struct ThrowableOffsets : public CheckOffsets<mirror::Throwable> {
   ThrowableOffsets() : CheckOffsets<mirror::Throwable>(false, "Ljava/lang/Throwable;") {
+    addOffset(OFFSETOF_MEMBER(mirror::Throwable, backtrace_), "backtrace");
     addOffset(OFFSETOF_MEMBER(mirror::Throwable, cause_), "cause");
     addOffset(OFFSETOF_MEMBER(mirror::Throwable, detail_message_), "detailMessage");
-    addOffset(OFFSETOF_MEMBER(mirror::Throwable, stack_state_), "stackState");
     addOffset(OFFSETOF_MEMBER(mirror::Throwable, stack_trace_), "stackTrace");
     addOffset(OFFSETOF_MEMBER(mirror::Throwable, suppressed_exceptions_), "suppressedExceptions");
   };
@@ -595,7 +596,7 @@
 struct AccessibleObjectOffsets : public CheckOffsets<mirror::AccessibleObject> {
   AccessibleObjectOffsets() : CheckOffsets<mirror::AccessibleObject>(
       false, "Ljava/lang/reflect/AccessibleObject;") {
-    addOffset(mirror::AccessibleObject::FlagOffset().Uint32Value(), "flag");
+    addOffset(mirror::AccessibleObject::FlagOffset().Uint32Value(), "override");
   };
 };
 
diff --git a/runtime/common_runtime_test.cc b/runtime/common_runtime_test.cc
index 5f9e413..ff6d07d 100644
--- a/runtime/common_runtime_test.cc
+++ b/runtime/common_runtime_test.cc
@@ -302,7 +302,12 @@
 
 
   RuntimeOptions options;
-  std::string boot_class_path_string = "-Xbootclasspath:" + GetLibCoreDexFileName();
+  std::string boot_class_path_string = "-Xbootclasspath";
+  for (const std::string &core_dex_file_name : GetLibCoreDexFileNames()) {
+    boot_class_path_string += ":";
+    boot_class_path_string += core_dex_file_name;
+  }
+
   options.push_back(std::make_pair(boot_class_path_string, nullptr));
   options.push_back(std::make_pair("-Xcheck:jni", nullptr));
   options.push_back(std::make_pair(min_heap_string, nullptr));
@@ -406,8 +411,8 @@
   Runtime::Current()->GetHeap()->VerifyHeap();  // Check for heap corruption after the test
 }
 
-std::string CommonRuntimeTest::GetLibCoreDexFileName() {
-  return GetDexFileName("core-libart");
+std::vector<std::string> CommonRuntimeTest::GetLibCoreDexFileNames() {
+  return std::vector<std::string>({GetDexFileName("core-oj"), GetDexFileName("core-libart")});
 }
 
 std::string CommonRuntimeTest::GetDexFileName(const std::string& jar_prefix) {
diff --git a/runtime/common_runtime_test.h b/runtime/common_runtime_test.h
index 34fdd8d..23926fd 100644
--- a/runtime/common_runtime_test.h
+++ b/runtime/common_runtime_test.h
@@ -77,8 +77,8 @@
   CommonRuntimeTest();
   ~CommonRuntimeTest();
 
-  // Gets the path of the libcore dex file.
-  static std::string GetLibCoreDexFileName();
+  // Gets the paths of the libcore dex files.
+  static std::vector<std::string> GetLibCoreDexFileNames();
 
   // Returns bin directory which contains host's prebuild tools.
   static std::string GetAndroidHostToolsDir();
diff --git a/runtime/dex_file_test.cc b/runtime/dex_file_test.cc
index 90b35a3..ef66bd9 100644
--- a/runtime/dex_file_test.cc
+++ b/runtime/dex_file_test.cc
@@ -206,7 +206,7 @@
   uint32_t checksum;
   ScopedObjectAccess soa(Thread::Current());
   std::string error_msg;
-  EXPECT_TRUE(DexFile::GetChecksum(GetLibCoreDexFileName().c_str(), &checksum, &error_msg))
+  EXPECT_TRUE(DexFile::GetChecksum(GetLibCoreDexFileNames()[0].c_str(), &checksum, &error_msg))
       << error_msg;
   EXPECT_EQ(java_lang_dex_file_->GetLocationChecksum(), checksum);
 }
diff --git a/runtime/mirror/class.h b/runtime/mirror/class.h
index 0453906..7af391e 100644
--- a/runtime/mirror/class.h
+++ b/runtime/mirror/class.h
@@ -522,8 +522,8 @@
   // The size of java.lang.Class.class.
   static uint32_t ClassClassSize(size_t pointer_size) {
     // The number of vtable entries in java.lang.Class.
-    uint32_t vtable_entries = Object::kVTableLength + 65;
-    return ComputeClassSize(true, vtable_entries, 0, 0, 0, 1, 0, pointer_size);
+    uint32_t vtable_entries = Object::kVTableLength + 68;
+    return ComputeClassSize(true, vtable_entries, 0, 0, 3, 1, 0, pointer_size);
   }
 
   // The size of a java.lang.Class representing a primitive such as int.class.
@@ -1181,6 +1181,8 @@
   static MemberOffset EmbeddedImTableOffset(size_t pointer_size);
   static MemberOffset EmbeddedVTableOffset(size_t pointer_size);
 
+  HeapReference<Object> annotation_type_;
+
   // Defining class loader, or null for the "bootstrap" system loader.
   HeapReference<ClassLoader> class_loader_;
 
@@ -1223,10 +1225,6 @@
   // virtual_ methods_ for miranda methods.
   HeapReference<PointerArray> vtable_;
 
-  // Access flags; low 16 bits are defined by VM spec.
-  // Note: Shuffled back.
-  uint32_t access_flags_;
-
   // static, private, and <init> methods. Pointer to an ArtMethod array.
   uint64_t direct_methods_;
 
@@ -1246,6 +1244,11 @@
   // Virtual methods defined in this class; invoked through vtable. Pointer to an ArtMethod array.
   uint64_t virtual_methods_;
 
+
+  // Access flags; low 16 bits are defined by VM spec.
+  // Note: Shuffled back.
+  uint32_t access_flags_;
+
   // Total size of the Class instance; used when allocating storage on gc heap.
   // See also object_size_.
   uint32_t class_size_;
diff --git a/runtime/mirror/reference-inl.h b/runtime/mirror/reference-inl.h
index 01e99b9..bd4a9c1 100644
--- a/runtime/mirror/reference-inl.h
+++ b/runtime/mirror/reference-inl.h
@@ -23,7 +23,7 @@
 namespace mirror {
 
 inline uint32_t Reference::ClassSize(size_t pointer_size) {
-  uint32_t vtable_entries = Object::kVTableLength + 5;
+  uint32_t vtable_entries = Object::kVTableLength + 4;
   return Class::ComputeClassSize(false, vtable_entries, 2, 0, 0, 0, 0, pointer_size);
 }
 
diff --git a/runtime/mirror/string-inl.h b/runtime/mirror/string-inl.h
index d283f58..e17e379 100644
--- a/runtime/mirror/string-inl.h
+++ b/runtime/mirror/string-inl.h
@@ -31,8 +31,8 @@
 namespace mirror {
 
 inline uint32_t String::ClassSize(size_t pointer_size) {
-  uint32_t vtable_entries = Object::kVTableLength + 52;
-  return Class::ComputeClassSize(true, vtable_entries, 0, 1, 0, 1, 2, pointer_size);
+  uint32_t vtable_entries = Object::kVTableLength + 53;
+  return Class::ComputeClassSize(true, vtable_entries, 0, 2, 0, 1, 2, pointer_size);
 }
 
 // Sets string count in the allocation code path to ensure it is guarded by a CAS.
diff --git a/runtime/mirror/throwable.cc b/runtime/mirror/throwable.cc
index 1c21edb..bcedaa0 100644
--- a/runtime/mirror/throwable.cc
+++ b/runtime/mirror/throwable.cc
@@ -56,9 +56,9 @@
 void Throwable::SetStackState(Object* state) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
   CHECK(state != nullptr);
   if (Runtime::Current()->IsActiveTransaction()) {
-    SetFieldObjectVolatile<true>(OFFSET_OF_OBJECT_MEMBER(Throwable, stack_state_), state);
+    SetFieldObjectVolatile<true>(OFFSET_OF_OBJECT_MEMBER(Throwable, backtrace_), state);
   } else {
-    SetFieldObjectVolatile<false>(OFFSET_OF_OBJECT_MEMBER(Throwable, stack_state_), state);
+    SetFieldObjectVolatile<false>(OFFSET_OF_OBJECT_MEMBER(Throwable, backtrace_), state);
   }
 }
 
diff --git a/runtime/mirror/throwable.h b/runtime/mirror/throwable.h
index 9cc0b6f..bf686d7 100644
--- a/runtime/mirror/throwable.h
+++ b/runtime/mirror/throwable.h
@@ -60,16 +60,16 @@
 
  private:
   Object* GetStackState() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
-    return GetFieldObjectVolatile<Object>(OFFSET_OF_OBJECT_MEMBER(Throwable, stack_state_));
+    return GetFieldObjectVolatile<Object>(OFFSET_OF_OBJECT_MEMBER(Throwable, backtrace_));
   }
   Object* GetStackTrace() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
     return GetFieldObjectVolatile<Object>(OFFSET_OF_OBJECT_MEMBER(Throwable, stack_trace_));
   }
 
   // Field order required by test "ValidateFieldOrderOfJavaCppUnionClasses".
+  HeapReference<Object> backtrace_;  // Note this is Java volatile:
   HeapReference<Throwable> cause_;
   HeapReference<String> detail_message_;
-  HeapReference<Object> stack_state_;  // Note this is Java volatile:
   HeapReference<Object> stack_trace_;
   HeapReference<Object> suppressed_exceptions_;
 
diff --git a/runtime/native/OpenjdkJvm.cc b/runtime/native/OpenjdkJvm.cc
new file mode 100644
index 0000000..be4e720
--- /dev/null
+++ b/runtime/native/OpenjdkJvm.cc
@@ -0,0 +1,616 @@
+/*
+ * Copyright (C) 2014 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.
+ */
+
+/*
+ * Services that OpenJDK expects the VM to provide.
+ */
+#include<stdio.h>
+#include <dlfcn.h>
+#include <limits.h>
+#include <unistd.h>
+
+#include "common_throws.h"
+#include "gc/heap.h"
+#include "thread.h"
+#include "thread_list.h"
+#include "runtime.h"
+#include "handle_scope-inl.h"
+#include "scoped_thread_state_change.h"
+#include "ScopedUtfChars.h"
+#include "mirror/class_loader.h"
+#include "verify_object-inl.h"
+#include "base/logging.h"
+#include "base/macros.h"
+#include "../../libcore/ojluni/src/main/native/jvm.h"  // TODO(narayan): fix it
+#include "jni_internal.h"
+#include "mirror/string-inl.h"
+#include "scoped_fast_native_object_access.h"
+#include "ScopedLocalRef.h"
+#include <sys/time.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+
+#undef LOG_TAG
+#define LOG_TAG "artopenjdx"
+
+using art::DEBUG;
+using art::WARNING;
+using art::VERBOSE;
+using art::INFO;
+using art::ERROR;
+using art::FATAL;
+
+/* posix open() with extensions; used by e.g. ZipFile */
+JNIEXPORT jint JVM_Open(const char* fname, jint flags, jint mode) {
+    LOG(DEBUG) << "JVM_Open fname='" << fname << "', flags=" << flags << ", mode=" << mode;
+
+    /*
+     * The call is expected to handle JVM_O_DELETE, which causes the file
+     * to be removed after it is opened.  Also, some code seems to
+     * want the special return value JVM_EEXIST if the file open fails
+     * due to O_EXCL.
+     */
+    int fd = TEMP_FAILURE_RETRY(open(fname, flags & ~JVM_O_DELETE, mode));
+    if (fd < 0) {
+        int err = errno;
+        LOG(DEBUG) << "open(" << fname << ") failed: " << strerror(errno);
+        if (err == EEXIST) {
+            return JVM_EEXIST;
+        } else {
+            return -1;
+        }
+    }
+
+    if (flags & JVM_O_DELETE) {
+        LOG(DEBUG) << "Deleting '" << fname << "' after open\n";
+        if (unlink(fname) != 0) {
+            LOG(WARNING) << "Post-open deletion of '" << fname << "' failed: " << strerror(errno);
+        }
+        /* ignore */
+    }
+
+    LOG(VERBOSE) << "open(" << fname << ") --> " << fd;
+    return fd;
+}
+
+/* posix close() */
+JNIEXPORT jint JVM_Close(jint fd) {
+    LOG(DEBUG) << "JVM_Close fd=" << fd;
+    // don't want TEMP_FAILURE_RETRY here -- file is closed even if EINTR
+    return close(fd);
+}
+
+/* posix read() */
+JNIEXPORT jint JVM_Read(jint fd, char* buf, jint nbytes) {
+    LOG(DEBUG) << "JVM_Read fd=" << fd << ", buf='" << buf << "', nbytes=" << nbytes;
+    return TEMP_FAILURE_RETRY(read(fd, buf, nbytes));
+}
+
+/* posix write(); is used to write messages to stderr */
+JNIEXPORT jint JVM_Write(jint fd, char* buf, jint nbytes) {
+    LOG(DEBUG) << "JVM_Write fd=" << fd << ", buf='" << buf << "', nbytes=" << nbytes;
+    return TEMP_FAILURE_RETRY(write(fd, buf, nbytes));
+}
+
+/* posix lseek() */
+JNIEXPORT jlong JVM_Lseek(jint fd, jlong offset, jint whence) {
+    LOG(DEBUG) << "JVM_Lseek fd=" << fd << ", offset=" << offset << ", whence=" << whence;
+    return TEMP_FAILURE_RETRY(lseek(fd, offset, whence));
+}
+
+/*
+ * "raw monitors" seem to be expected to behave like non-recursive pthread
+ * mutexes.  They're used by ZipFile.
+ */
+JNIEXPORT void* JVM_RawMonitorCreate(void) {
+    LOG(DEBUG) << "JVM_RawMonitorCreate";
+    pthread_mutex_t* newMutex =
+        reinterpret_cast<pthread_mutex_t*>(malloc(sizeof(pthread_mutex_t)));
+    pthread_mutex_init(newMutex, NULL);
+    return newMutex;
+}
+
+JNIEXPORT void JVM_RawMonitorDestroy(void* mon) {
+    LOG(DEBUG) << "JVM_RawMonitorDestroy mon=" << mon;
+    pthread_mutex_destroy(reinterpret_cast<pthread_mutex_t*>(mon));
+}
+
+JNIEXPORT jint JVM_RawMonitorEnter(void* mon) {
+    LOG(DEBUG) << "JVM_RawMonitorEnter mon=" << mon;
+    return pthread_mutex_lock(reinterpret_cast<pthread_mutex_t*>(mon));
+}
+
+JNIEXPORT void JVM_RawMonitorExit(void* mon) {
+    LOG(DEBUG) << "JVM_RawMonitorExit mon=" << mon;
+    pthread_mutex_unlock(reinterpret_cast<pthread_mutex_t*>(mon));
+}
+
+JNIEXPORT char* JVM_NativePath(char* path) {
+    LOG(DEBUG) << "JVM_NativePath path='" << path << "'";
+    return path;
+}
+
+JNIEXPORT jint JVM_GetLastErrorString(char* buf, int len) {
+#if defined(__GLIBC__) || defined(__BIONIC__)
+  int err = errno;    // grab before JVM_TRACE can trash it
+  LOG(DEBUG) << "JVM_GetLastErrorString buf=" << buf << ", len=" << len;
+
+  if (len == 0) {
+    return 0;
+  }
+
+  char* result = strerror_r(err, buf, len);
+  if (result != buf) {
+    strncpy(buf, result, len);
+    buf[len - 1] = '\0';
+  }
+
+  return strlen(buf);
+#else
+  UNUSED(buf);
+  UNUSED(len);
+  return -1;
+#endif
+}
+
+JNIEXPORT int jio_fprintf(FILE* fp, const char* fmt, ...) {
+    va_list args;
+
+    va_start(args, fmt);
+    int len = jio_vfprintf(fp, fmt, args);
+    va_end(args);
+
+    return len;
+}
+
+JNIEXPORT int jio_vfprintf(FILE* fp, const char* fmt, va_list args) {
+    assert(fp != NULL);
+    return vfprintf(fp, fmt, args);
+}
+
+/* posix fsync() */
+JNIEXPORT jint JVM_Sync(jint fd) {
+    LOG(DEBUG) << "JVM_Sync fd=" << fd;
+    return TEMP_FAILURE_RETRY(fsync(fd));
+}
+
+JNIEXPORT void* JVM_FindLibraryEntry(void* handle, const char* name) {
+    LOG(DEBUG) << "JVM_FindLibraryEntry handle=" << handle << " name=" << name;
+    return dlsym(handle, name);
+}
+
+JNIEXPORT jlong JVM_CurrentTimeMillis(JNIEnv* env, jclass unused) {
+    LOG(DEBUG) << "JVM_CurrentTimeMillis env=" << env;
+    struct timeval tv;
+
+    gettimeofday(&tv, (struct timezone *) NULL);
+    jlong when = tv.tv_sec * 1000LL + tv.tv_usec / 1000;
+    return when;
+}
+
+JNIEXPORT jint JVM_Socket(jint domain, jint type, jint protocol) {
+    LOG(DEBUG) << "JVM_Socket domain=" << domain << ", type=" << type << ", protocol=" << protocol;
+
+    return TEMP_FAILURE_RETRY(socket(domain, type, protocol));
+}
+
+JNIEXPORT jint JVM_InitializeSocketLibrary() {
+  return 0;
+}
+
+int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
+  if ((intptr_t)count <= 0) return -1;
+  return vsnprintf(str, count, fmt, args);
+}
+
+int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
+  va_list args;
+  int len;
+  va_start(args, fmt);
+  len = jio_vsnprintf(str, count, fmt, args);
+  va_end(args);
+  return len;
+}
+
+JNIEXPORT jint JVM_SetSockOpt(jint fd, int level, int optname,
+    const char* optval, int optlen) {
+  LOG(DEBUG) << "JVM_SetSockOpt fd=" << fd << ", level=" << level << ", optname=" << optname
+             << ", optval=" << optval << ", optlen=" << optlen;
+  return TEMP_FAILURE_RETRY(setsockopt(fd, level, optname, optval, optlen));
+}
+
+JNIEXPORT jint JVM_SocketShutdown(jint fd, jint howto) {
+  LOG(DEBUG) << "JVM_SocketShutdown fd=" << fd << ", howto=" << howto;
+  return TEMP_FAILURE_RETRY(shutdown(fd, howto));
+}
+
+JNIEXPORT jint JVM_GetSockOpt(jint fd, int level, int optname, char* optval,
+  int* optlen) {
+  LOG(DEBUG) << "JVM_GetSockOpt fd=" << fd << ", level=" << level << ", optname=" << optname
+             << ", optval=" << optval << ", optlen=" << optlen;
+
+  socklen_t len = *optlen;
+  int cc = TEMP_FAILURE_RETRY(getsockopt(fd, level, optname, optval, &len));
+  *optlen = len;
+  return cc;
+}
+
+JNIEXPORT jint JVM_GetSockName(jint fd, struct sockaddr* addr, int* addrlen) {
+  LOG(DEBUG) << "JVM_GetSockName fd=" << fd << ", addr=" << addr << ", addrlen=" << addrlen;
+
+  socklen_t len = *addrlen;
+  int cc = TEMP_FAILURE_RETRY(getsockname(fd, addr, &len));
+  *addrlen = len;
+  return cc;
+}
+
+JNIEXPORT jint JVM_SocketAvailable(jint fd, jint* result) {
+  LOG(DEBUG) << "JVM_SocketAvailable fd=" << fd << ", result=" << result;
+
+  if (TEMP_FAILURE_RETRY(ioctl(fd, FIONREAD, result)) < 0) {
+      LOG(DEBUG) << "ioctl(" << fd << ", FIONREAD) failed: " << strerror(errno);
+      return JNI_FALSE;
+  }
+
+  return JNI_TRUE;
+}
+
+JNIEXPORT jint JVM_Send(jint fd, char* buf, jint nBytes, jint flags) {
+  LOG(DEBUG) << "JVM_Send fd=" << fd << ", buf=" << buf << ", nBytes="
+             << nBytes << ", flags=" << flags;
+
+  return TEMP_FAILURE_RETRY(send(fd, buf, nBytes, flags));
+}
+
+JNIEXPORT jint JVM_SocketClose(jint fd) {
+  LOG(DEBUG) << "JVM_SocketClose fd=" << fd;
+
+    // don't want TEMP_FAILURE_RETRY here -- file is closed even if EINTR
+  return close(fd);
+}
+
+JNIEXPORT jint JVM_Listen(jint fd, jint count) {
+  LOG(DEBUG) << "JVM_Listen fd=" << fd << ", count=" << count;
+
+  return TEMP_FAILURE_RETRY(listen(fd, count));
+}
+
+JNIEXPORT jint JVM_Connect(jint fd, struct sockaddr* addr, jint addrlen) {
+  LOG(DEBUG) << "JVM_Connect fd=" << fd << ", addr=" << addr << ", addrlen=" << addrlen;
+
+  return TEMP_FAILURE_RETRY(connect(fd, addr, addrlen));
+}
+
+JNIEXPORT int JVM_GetHostName(char* name, int namelen) {
+  LOG(DEBUG) << "JVM_GetHostName name=" << name << ", namelen=" << namelen;
+
+  return TEMP_FAILURE_RETRY(gethostname(name, namelen));
+}
+
+JNIEXPORT jstring JVM_InternString(JNIEnv* env, jstring jstr) {
+  LOG(DEBUG) << "JVM_InternString env=" << env << ", jstr=" << jstr;
+  art::ScopedFastNativeObjectAccess soa(env);
+  art::mirror::String* s = soa.Decode<art::mirror::String*>(jstr);
+  art::mirror::String* result = s->Intern();
+  return soa.AddLocalReference<jstring>(result);
+}
+
+JNIEXPORT jlong JVM_FreeMemory(void) {
+  return art::Runtime::Current()->GetHeap()->GetFreeMemory();
+}
+
+JNIEXPORT jlong JVM_TotalMemory(void) {
+  return art::Runtime::Current()->GetHeap()->GetTotalMemory();
+}
+
+JNIEXPORT jlong JVM_MaxMemory(void) {
+  return art::Runtime::Current()->GetHeap()->GetMaxMemory();
+}
+
+JNIEXPORT void JVM_GC(void) {
+  if (art::Runtime::Current()->IsExplicitGcDisabled()) {
+      LOG(INFO) << "Explicit GC skipped.";
+      return;
+  }
+  art::Runtime::Current()->GetHeap()->CollectGarbage(false);
+}
+
+JNIEXPORT void JVM_Exit(jint status) {
+  LOG(INFO) << "System.exit called, status: " << status;
+  art::Runtime::Current()->CallExitHook(status);
+  exit(status);
+}
+
+JNIEXPORT jstring JVM_NativeLoad(JNIEnv* env, jstring javaFilename, jobject javaLoader,
+                                 jstring javaLdLibraryPath) {
+  ScopedUtfChars filename(env, javaFilename);
+  if (filename.c_str() == NULL) {
+    return NULL;
+  }
+
+  if (javaLdLibraryPath != NULL) {
+    ScopedUtfChars ldLibraryPath(env, javaLdLibraryPath);
+    if (ldLibraryPath.c_str() == NULL) {
+      return NULL;
+    }
+    void* sym = dlsym(RTLD_DEFAULT, "android_update_LD_LIBRARY_PATH");
+    if (sym != NULL) {
+      typedef void (*Fn)(const char*);
+      Fn android_update_LD_LIBRARY_PATH = reinterpret_cast<Fn>(sym);
+      (*android_update_LD_LIBRARY_PATH)(ldLibraryPath.c_str());
+    } else {
+      LOG(ERROR) << "android_update_LD_LIBRARY_PATH not found; .so dependencies will not work!";
+    }
+  }
+
+  std::string detail;
+  {
+    art::ScopedObjectAccess soa(env);
+    art::StackHandleScope<1> hs(soa.Self());
+    art::JavaVMExt* vm = art::Runtime::Current()->GetJavaVM();
+    bool success = vm->LoadNativeLibrary(env, filename.c_str(), javaLoader, &detail);
+    if (success) {
+      return nullptr;
+    }
+  }
+
+  // Don't let a pending exception from JNI_OnLoad cause a CheckJNI issue with NewStringUTF.
+  env->ExceptionClear();
+  return env->NewStringUTF(detail.c_str());
+}
+
+JNIEXPORT void JVM_StartThread(JNIEnv* env, jobject jthread, jlong stack_size, jboolean daemon) {
+  art::Thread::CreateNativeThread(env, jthread, stack_size, daemon == JNI_TRUE);
+}
+
+JNIEXPORT void JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio) {
+  art::ScopedObjectAccess soa(env);
+  art::MutexLock mu(soa.Self(), *art::Locks::thread_list_lock_);
+  art::Thread* thread = art::Thread::FromManagedThread(soa, jthread);
+  if (thread != NULL) {
+    thread->SetNativePriority(prio);
+  }
+}
+
+JNIEXPORT void JVM_Yield(JNIEnv* env, jclass threadClass) {
+  sched_yield();
+}
+
+JNIEXPORT void JVM_Sleep(JNIEnv* env, jclass threadClass, jobject java_lock, jlong millis) {
+  art::ScopedFastNativeObjectAccess soa(env);
+  art::mirror::Object* lock = soa.Decode<art::mirror::Object*>(java_lock);
+  art::Monitor::Wait(art::Thread::Current(), lock, millis, 0, true, art::kSleeping);
+}
+
+JNIEXPORT jobject JVM_CurrentThread(JNIEnv* env, jclass unused) {
+  art::ScopedFastNativeObjectAccess soa(env);
+  return soa.AddLocalReference<jobject>(soa.Self()->GetPeer());
+}
+
+JNIEXPORT void JVM_Interrupt(JNIEnv* env, jobject jthread) {
+  art::ScopedFastNativeObjectAccess soa(env);
+  art::MutexLock mu(soa.Self(), *art::Locks::thread_list_lock_);
+  art::Thread* thread = art::Thread::FromManagedThread(soa, jthread);
+  if (thread != nullptr) {
+    thread->Interrupt(soa.Self());
+  }
+}
+
+JNIEXPORT jboolean JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clearInterrupted) {
+  if (clearInterrupted) {
+    return static_cast<art::JNIEnvExt*>(env)->self->Interrupted() ? JNI_TRUE : JNI_FALSE;
+  } else {
+    art::ScopedFastNativeObjectAccess soa(env);
+    art::MutexLock mu(soa.Self(), *art::Locks::thread_list_lock_);
+    art::Thread* thread = art::Thread::FromManagedThread(soa, jthread);
+    return (thread != nullptr) ? thread->IsInterrupted() : JNI_FALSE;
+  }
+}
+
+JNIEXPORT jboolean JVM_HoldsLock(JNIEnv* env, jclass unused, jobject jobj) {
+  art::ScopedObjectAccess soa(env);
+  art::mirror::Object* object = soa.Decode<art::mirror::Object*>(jobj);
+  if (object == NULL) {
+    art::ThrowNullPointerException("object == null");
+    return JNI_FALSE;
+  }
+  return soa.Self()->HoldsLock(object);
+}
+
+JNIEXPORT void JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring java_name) {
+  ScopedUtfChars name(env, java_name);
+  {
+    art::ScopedObjectAccess soa(env);
+    if (soa.Decode<art::mirror::Object*>(jthread) == soa.Self()->GetPeer()) {
+      soa.Self()->SetThreadName(name.c_str());
+      return;
+    }
+  }
+  // Suspend thread to avoid it from killing itself while we set its name. We don't just hold the
+  // thread list lock to avoid this, as setting the thread name causes mutator to lock/unlock
+  // in the DDMS send code.
+  art::ThreadList* thread_list = art::Runtime::Current()->GetThreadList();
+  bool timed_out;
+  // Take suspend thread lock to avoid races with threads trying to suspend this one.
+  art::Thread* thread;
+  {
+    thread = thread_list->SuspendThreadByPeer(jthread, true, false, &timed_out);
+  }
+  if (thread != NULL) {
+    {
+      art::ScopedObjectAccess soa(env);
+      thread->SetThreadName(name.c_str());
+    }
+    thread_list->Resume(thread, false);
+  } else if (timed_out) {
+    LOG(ERROR) << "Trying to set thread name to '" << name.c_str() << "' failed as the thread "
+        "failed to suspend within a generous timeout.";
+  }
+}
+
+JNIEXPORT jint JVM_IHashCode(JNIEnv* env, jobject javaObject) {
+  if (UNLIKELY(javaObject == nullptr)) {
+    return 0;
+  }
+  art::ScopedFastNativeObjectAccess soa(env);
+  art::mirror::Object* o = soa.Decode<art::mirror::Object*>(javaObject);
+  return static_cast<jint>(o->IdentityHashCode());
+}
+
+JNIEXPORT jlong JVM_NanoTime(JNIEnv* env, jclass unused) {
+#if defined(HAVE_POSIX_CLOCKS)
+    timespec now;
+    clock_gettime(CLOCK_MONOTONIC, &now);
+    return now.tv_sec * 1000000000LL + now.tv_nsec;
+#else
+    timeval now;
+    gettimeofday(&now, NULL);
+    return static_cast<jlong>(now.tv_sec) * 1000000000LL + now.tv_usec * 1000LL;
+#endif
+}
+static void ThrowArrayStoreException_NotAnArray(const char* identifier, art::mirror::Object* array)
+    SHARED_LOCKS_REQUIRED(art::Locks::mutator_lock_) {
+  std::string actualType(art::PrettyTypeOf(array));
+  art::Thread* self = art::Thread::Current();
+  self->ThrowNewExceptionF("Ljava/lang/ArrayStoreException;",
+                           "%s of type %s is not an array", identifier, actualType.c_str());
+}
+
+JNIEXPORT void JVM_ArrayCopy(JNIEnv* env, jclass unused, jobject javaSrc,
+                             jint srcPos, jobject javaDst, jint dstPos, jint length) {
+  // The API is defined in terms of length, but length is somewhat overloaded so we use count.
+  const jint count = length;
+  art::ScopedFastNativeObjectAccess soa(env);
+
+  // Null pointer checks.
+  if (UNLIKELY(javaSrc == nullptr)) {
+    art::ThrowNullPointerException("src == null");
+    return;
+  }
+  if (UNLIKELY(javaDst == nullptr)) {
+    art::ThrowNullPointerException("dst == null");
+    return;
+  }
+
+  // Make sure source and destination are both arrays.
+  art::mirror::Object* srcObject = soa.Decode<art::mirror::Object*>(javaSrc);
+  if (UNLIKELY(!srcObject->IsArrayInstance())) {
+    ThrowArrayStoreException_NotAnArray("source", srcObject);
+    return;
+  }
+  art::mirror::Object* dstObject = soa.Decode<art::mirror::Object*>(javaDst);
+  if (UNLIKELY(!dstObject->IsArrayInstance())) {
+    ThrowArrayStoreException_NotAnArray("destination", dstObject);
+    return;
+  }
+  art::mirror::Array* srcArray = srcObject->AsArray();
+  art::mirror::Array* dstArray = dstObject->AsArray();
+
+  // Bounds checking.
+  if (UNLIKELY(srcPos < 0) || UNLIKELY(dstPos < 0) || UNLIKELY(count < 0) ||
+      UNLIKELY(srcPos > srcArray->GetLength() - count) ||
+      UNLIKELY(dstPos > dstArray->GetLength() - count)) {
+    soa.Self()->ThrowNewExceptionF("Ljava/lang/ArrayIndexOutOfBoundsException;",
+                                   "src.length=%d srcPos=%d dst.length=%d dstPos=%d length=%d",
+                                   srcArray->GetLength(), srcPos, dstArray->GetLength(), dstPos,
+                                   count);
+    return;
+  }
+
+  art::mirror::Class* dstComponentType = dstArray->GetClass()->GetComponentType();
+  art::mirror::Class* srcComponentType = srcArray->GetClass()->GetComponentType();
+  art::Primitive::Type dstComponentPrimitiveType = dstComponentType->GetPrimitiveType();
+
+  if (LIKELY(srcComponentType == dstComponentType)) {
+    // Trivial assignability.
+    switch (dstComponentPrimitiveType) {
+      case art::Primitive::kPrimVoid:
+        LOG(FATAL) << "Unreachable, cannot have arrays of type void";
+        return;
+      case art::Primitive::kPrimBoolean:
+      case art::Primitive::kPrimByte:
+        DCHECK_EQ(art::Primitive::ComponentSize(dstComponentPrimitiveType), 1U);
+        dstArray->AsByteSizedArray()->Memmove(dstPos, srcArray->AsByteSizedArray(), srcPos, count);
+        return;
+      case art::Primitive::kPrimChar:
+      case art::Primitive::kPrimShort:
+        DCHECK_EQ(art::Primitive::ComponentSize(dstComponentPrimitiveType), 2U);
+        dstArray->AsShortSizedArray()->Memmove(dstPos, srcArray->AsShortSizedArray(), srcPos, count);
+        return;
+      case art::Primitive::kPrimInt:
+      case art::Primitive::kPrimFloat:
+        DCHECK_EQ(art::Primitive::ComponentSize(dstComponentPrimitiveType), 4U);
+        dstArray->AsIntArray()->Memmove(dstPos, srcArray->AsIntArray(), srcPos, count);
+        return;
+      case art::Primitive::kPrimLong:
+      case art::Primitive::kPrimDouble:
+        DCHECK_EQ(art::Primitive::ComponentSize(dstComponentPrimitiveType), 8U);
+        dstArray->AsLongArray()->Memmove(dstPos, srcArray->AsLongArray(), srcPos, count);
+        return;
+      case art::Primitive::kPrimNot: {
+        art::mirror::ObjectArray<art::mirror::Object>* dstObjArray = dstArray->AsObjectArray<art::mirror::Object>();
+        art::mirror::ObjectArray<art::mirror::Object>* srcObjArray = srcArray->AsObjectArray<art::mirror::Object>();
+        dstObjArray->AssignableMemmove(dstPos, srcObjArray, srcPos, count);
+        return;
+      }
+      default:
+        LOG(FATAL) << "Unknown array type: " << art::PrettyTypeOf(srcArray);
+        return;
+    }
+  }
+  // If one of the arrays holds a primitive type the other array must hold the exact same type.
+  if (UNLIKELY((dstComponentPrimitiveType != art::Primitive::kPrimNot) ||
+               srcComponentType->IsPrimitive())) {
+    std::string srcType(art::PrettyTypeOf(srcArray));
+    std::string dstType(art::PrettyTypeOf(dstArray));
+    soa.Self()->ThrowNewExceptionF("Ljava/lang/ArrayStoreException;",
+                                   "Incompatible types: src=%s, dst=%s",
+                                   srcType.c_str(), dstType.c_str());
+    return;
+  }
+  // Arrays hold distinct types and so therefore can't alias - use memcpy instead of memmove.
+  art::mirror::ObjectArray<art::mirror::Object>* dstObjArray = dstArray->AsObjectArray<art::mirror::Object>();
+  art::mirror::ObjectArray<art::mirror::Object>* srcObjArray = srcArray->AsObjectArray<art::mirror::Object>();
+  // If we're assigning into say Object[] then we don't need per element checks.
+  if (dstComponentType->IsAssignableFrom(srcComponentType)) {
+    dstObjArray->AssignableMemcpy(dstPos, srcObjArray, srcPos, count);
+    return;
+  }
+  dstObjArray->AssignableCheckingMemcpy(dstPos, srcObjArray, srcPos, count, true);
+}
+
+JNIEXPORT jint JVM_FindSignal(const char* name) {
+  LOG(FATAL) << "JVM_FindSignal is not implemented";
+  return 0;
+}
+
+JNIEXPORT void* JVM_RegisterSignal(jint signum, void* handler) {
+  LOG(FATAL) << "JVM_RegisterSignal is not implemented";
+  return nullptr;
+}
+
+JNIEXPORT jboolean JVM_RaiseSignal(jint signum) {
+  LOG(FATAL) << "JVM_RaiseSignal is not implemented";
+  return JNI_FALSE;
+}
+
+JNIEXPORT void JVM_Halt(jint code) {
+  exit(code);
+}
+
+JNIEXPORT jboolean JVM_IsNaN(jdouble d) {
+  return isnan(d);
+}
diff --git a/runtime/native/java_lang_System.cc b/runtime/native/java_lang_System.cc
index 736b42b..5447275 100644
--- a/runtime/native/java_lang_System.cc
+++ b/runtime/native/java_lang_System.cc
@@ -28,124 +28,6 @@
 
 namespace art {
 
-/*
- * We make guarantees about the atomicity of accesses to primitive variables.  These guarantees
- * also apply to elements of arrays. In particular, 8-bit, 16-bit, and 32-bit accesses must not
- * cause "word tearing".  Accesses to 64-bit array elements may be two 32-bit operations.
- * References are never torn regardless of the number of bits used to represent them.
- */
-
-static void ThrowArrayStoreException_NotAnArray(const char* identifier, mirror::Object* array)
-    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
-  std::string actualType(PrettyTypeOf(array));
-  Thread* self = Thread::Current();
-  self->ThrowNewExceptionF("Ljava/lang/ArrayStoreException;",
-                           "%s of type %s is not an array", identifier, actualType.c_str());
-}
-
-static void System_arraycopy(JNIEnv* env, jclass, jobject javaSrc, jint srcPos, jobject javaDst,
-                             jint dstPos, jint length) {
-  // The API is defined in terms of length, but length is somewhat overloaded so we use count.
-  const jint count = length;
-  ScopedFastNativeObjectAccess soa(env);
-
-  // Null pointer checks.
-  if (UNLIKELY(javaSrc == nullptr)) {
-    ThrowNullPointerException("src == null");
-    return;
-  }
-  if (UNLIKELY(javaDst == nullptr)) {
-    ThrowNullPointerException("dst == null");
-    return;
-  }
-
-  // Make sure source and destination are both arrays.
-  mirror::Object* srcObject = soa.Decode<mirror::Object*>(javaSrc);
-  if (UNLIKELY(!srcObject->IsArrayInstance())) {
-    ThrowArrayStoreException_NotAnArray("source", srcObject);
-    return;
-  }
-  mirror::Object* dstObject = soa.Decode<mirror::Object*>(javaDst);
-  if (UNLIKELY(!dstObject->IsArrayInstance())) {
-    ThrowArrayStoreException_NotAnArray("destination", dstObject);
-    return;
-  }
-  mirror::Array* srcArray = srcObject->AsArray();
-  mirror::Array* dstArray = dstObject->AsArray();
-
-  // Bounds checking.
-  if (UNLIKELY(srcPos < 0) || UNLIKELY(dstPos < 0) || UNLIKELY(count < 0) ||
-      UNLIKELY(srcPos > srcArray->GetLength() - count) ||
-      UNLIKELY(dstPos > dstArray->GetLength() - count)) {
-    soa.Self()->ThrowNewExceptionF("Ljava/lang/ArrayIndexOutOfBoundsException;",
-                                   "src.length=%d srcPos=%d dst.length=%d dstPos=%d length=%d",
-                                   srcArray->GetLength(), srcPos, dstArray->GetLength(), dstPos,
-                                   count);
-    return;
-  }
-
-  mirror::Class* dstComponentType = dstArray->GetClass()->GetComponentType();
-  mirror::Class* srcComponentType = srcArray->GetClass()->GetComponentType();
-  Primitive::Type dstComponentPrimitiveType = dstComponentType->GetPrimitiveType();
-
-  if (LIKELY(srcComponentType == dstComponentType)) {
-    // Trivial assignability.
-    switch (dstComponentPrimitiveType) {
-      case Primitive::kPrimVoid:
-        LOG(FATAL) << "Unreachable, cannot have arrays of type void";
-        UNREACHABLE();
-      case Primitive::kPrimBoolean:
-      case Primitive::kPrimByte:
-        DCHECK_EQ(Primitive::ComponentSize(dstComponentPrimitiveType), 1U);
-        dstArray->AsByteSizedArray()->Memmove(dstPos, srcArray->AsByteSizedArray(), srcPos, count);
-        return;
-      case Primitive::kPrimChar:
-      case Primitive::kPrimShort:
-        DCHECK_EQ(Primitive::ComponentSize(dstComponentPrimitiveType), 2U);
-        dstArray->AsShortSizedArray()->Memmove(dstPos, srcArray->AsShortSizedArray(), srcPos, count);
-        return;
-      case Primitive::kPrimInt:
-      case Primitive::kPrimFloat:
-        DCHECK_EQ(Primitive::ComponentSize(dstComponentPrimitiveType), 4U);
-        dstArray->AsIntArray()->Memmove(dstPos, srcArray->AsIntArray(), srcPos, count);
-        return;
-      case Primitive::kPrimLong:
-      case Primitive::kPrimDouble:
-        DCHECK_EQ(Primitive::ComponentSize(dstComponentPrimitiveType), 8U);
-        dstArray->AsLongArray()->Memmove(dstPos, srcArray->AsLongArray(), srcPos, count);
-        return;
-      case Primitive::kPrimNot: {
-        mirror::ObjectArray<mirror::Object>* dstObjArray = dstArray->AsObjectArray<mirror::Object>();
-        mirror::ObjectArray<mirror::Object>* srcObjArray = srcArray->AsObjectArray<mirror::Object>();
-        dstObjArray->AssignableMemmove(dstPos, srcObjArray, srcPos, count);
-        return;
-      }
-      default:
-        LOG(FATAL) << "Unknown array type: " << PrettyTypeOf(srcArray);
-        UNREACHABLE();
-    }
-  }
-  // If one of the arrays holds a primitive type the other array must hold the exact same type.
-  if (UNLIKELY((dstComponentPrimitiveType != Primitive::kPrimNot) ||
-               srcComponentType->IsPrimitive())) {
-    std::string srcType(PrettyTypeOf(srcArray));
-    std::string dstType(PrettyTypeOf(dstArray));
-    soa.Self()->ThrowNewExceptionF("Ljava/lang/ArrayStoreException;",
-                                   "Incompatible types: src=%s, dst=%s",
-                                   srcType.c_str(), dstType.c_str());
-    return;
-  }
-  // Arrays hold distinct types and so therefore can't alias - use memcpy instead of memmove.
-  mirror::ObjectArray<mirror::Object>* dstObjArray = dstArray->AsObjectArray<mirror::Object>();
-  mirror::ObjectArray<mirror::Object>* srcObjArray = srcArray->AsObjectArray<mirror::Object>();
-  // If we're assigning into say Object[] then we don't need per element checks.
-  if (dstComponentType->IsAssignableFrom(srcComponentType)) {
-    dstObjArray->AssignableMemcpy(dstPos, srcObjArray, srcPos, count);
-    return;
-  }
-  dstObjArray->AssignableCheckingMemcpy(dstPos, srcObjArray, srcPos, count, true);
-}
-
 // Template to convert general array to that of its specific primitive type.
 template <typename T>
 inline T* AsPrimitiveArray(mirror::Array* array) {
@@ -215,17 +97,7 @@
       javaDst, dstPos, count);
 }
 
-static jint System_identityHashCode(JNIEnv* env, jclass, jobject javaObject) {
-  if (UNLIKELY(javaObject == nullptr)) {
-    return 0;
-  }
-  ScopedFastNativeObjectAccess soa(env);
-  mirror::Object* o = soa.Decode<mirror::Object*>(javaObject);
-  return static_cast<jint>(o->IdentityHashCode());
-}
-
 static JNINativeMethod gMethods[] = {
-  NATIVE_METHOD(System, arraycopy, "!(Ljava/lang/Object;ILjava/lang/Object;II)V"),
   NATIVE_METHOD(System, arraycopyCharUnchecked, "!([CI[CII)V"),
   NATIVE_METHOD(System, arraycopyByteUnchecked, "!([BI[BII)V"),
   NATIVE_METHOD(System, arraycopyShortUnchecked, "!([SI[SII)V"),
@@ -234,7 +106,6 @@
   NATIVE_METHOD(System, arraycopyFloatUnchecked, "!([FI[FII)V"),
   NATIVE_METHOD(System, arraycopyDoubleUnchecked, "!([DI[DII)V"),
   NATIVE_METHOD(System, arraycopyBooleanUnchecked, "!([ZI[ZII)V"),
-  NATIVE_METHOD(System, identityHashCode, "!(Ljava/lang/Object;)I"),
 };
 
 void register_java_lang_System(JNIEnv* env) {
diff --git a/runtime/native/sun_misc_Unsafe.cc b/runtime/native/sun_misc_Unsafe.cc
index 770644c..4b8e233 100644
--- a/runtime/native/sun_misc_Unsafe.cc
+++ b/runtime/native/sun_misc_Unsafe.cc
@@ -15,7 +15,7 @@
  */
 
 #include "sun_misc_Unsafe.h"
-
+#include "common_throws.h"
 #include "gc/accounting/card_table-inl.h"
 #include "jni_internal.h"
 #include "mirror/array.h"
@@ -23,6 +23,10 @@
 #include "mirror/object-inl.h"
 #include "scoped_fast_native_object_access.h"
 
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+
 namespace art {
 
 static jboolean Unsafe_compareAndSwapInt(JNIEnv* env, jobject, jobject javaObj, jlong offset,
@@ -185,6 +189,283 @@
   return Primitive::ComponentSize(primitive_type);
 }
 
+static jint Unsafe_addressSize(JNIEnv* env, jobject) {
+  return sizeof(void*);
+}
+
+static jint Unsafe_pageSize(JNIEnv* env, jobject) {
+  return sysconf(_SC_PAGESIZE);
+}
+
+static jlong Unsafe_allocateMemory(JNIEnv* env, jobject, jlong bytes) {
+  ScopedFastNativeObjectAccess soa(env);
+  // bytes is nonnegative and fits into size_t
+  if (bytes < 0 || bytes != (jlong)(size_t) bytes) {
+    ThrowIllegalAccessException("wrong number of bytes");
+    return 0;
+  }
+  void* mem = malloc(bytes);
+  if (mem == nullptr) {
+    soa.Self()->ThrowOutOfMemoryError("native alloc");
+    return 0;
+  }
+  return (uintptr_t) mem;
+}
+
+static void Unsafe_freeMemory(JNIEnv* env, jobject, jlong address) {
+  free(reinterpret_cast<void*>(static_cast<uintptr_t>(address)));
+}
+
+static void Unsafe_setMemory(JNIEnv* env, jobject, jlong address, jlong bytes, jbyte value) {
+  memset(reinterpret_cast<void*>(static_cast<uintptr_t>(address)), value, bytes);
+}
+
+static jbyte Unsafe_getByte$(JNIEnv* env, jobject, jlong address) {
+  return *reinterpret_cast<jbyte*>(address);
+}
+
+static void Unsafe_putByte$(JNIEnv* env, jobject, jlong address, jbyte value) {
+  *reinterpret_cast<jbyte*>(address) = value;
+}
+
+static jshort Unsafe_getShort$(JNIEnv* env, jobject, jlong address) {
+  return *reinterpret_cast<jshort*>(address);
+}
+
+static void Unsafe_putShort$(JNIEnv* env, jobject, jlong address, jshort value) {
+  *reinterpret_cast<jshort*>(address) = value;
+}
+
+static jchar Unsafe_getChar$(JNIEnv* env, jobject, jlong address) {
+  return *reinterpret_cast<jchar*>(address);
+}
+
+static void Unsafe_putChar$(JNIEnv* env, jobject, jlong address, jchar value) {
+  *reinterpret_cast<jchar*>(address) = value;
+}
+
+static jint Unsafe_getInt$(JNIEnv* env, jobject, jlong address) {
+  return *reinterpret_cast<jint*>(address);
+}
+
+static void Unsafe_putInt$(JNIEnv* env, jobject, jlong address, jint value) {
+  *reinterpret_cast<jint*>(address) = value;
+}
+
+static jlong Unsafe_getLong$(JNIEnv* env, jobject, jlong address) {
+  return *reinterpret_cast<jlong*>(address);
+}
+
+static void Unsafe_putLong$(JNIEnv* env, jobject, jlong address, jlong value) {
+  *reinterpret_cast<jlong*>(address) = value;
+}
+
+static jfloat Unsafe_getFloat$(JNIEnv* env, jobject, jlong address) {
+  return *reinterpret_cast<jfloat*>(address);
+}
+
+static void Unsafe_putFloat$(JNIEnv* env, jobject, jlong address, jfloat value) {
+  *reinterpret_cast<jfloat*>(address) = value;
+}
+static jdouble Unsafe_getDouble$(JNIEnv* env, jobject, jlong address) {
+  return *reinterpret_cast<jdouble*>(address);
+}
+
+static void Unsafe_putDouble$(JNIEnv* env, jobject, jlong address, jdouble value) {
+  *reinterpret_cast<jdouble*>(address) = value;
+}
+
+static jlong Unsafe_getAddress(JNIEnv* env ATTRIBUTE_UNUSED, jobject, jlong address) {
+  void* p = (void*)(uintptr_t)address;
+  return (uintptr_t)(*(void**)p);
+}
+
+static void Unsafe_copyMemory(JNIEnv *env, jobject unsafe, jlong src, jlong dst, jlong size) {
+    if (size == 0) {
+        return;
+    }
+    // size is nonnegative and fits into size_t
+    if (size < 0 || size != (jlong)(size_t) size) {
+        ScopedFastNativeObjectAccess soa(env);
+        ThrowIllegalAccessException("wrong number of bytes");
+    }
+    size_t sz = (size_t)size;
+    memcpy(reinterpret_cast<void *>(dst), reinterpret_cast<void *>(src), sz);
+}
+
+template<typename T>
+static void copyToArray(jlong srcAddr, mirror::PrimitiveArray<T>* array,
+                        size_t array_offset,
+                        size_t size)
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
+    const T* src = reinterpret_cast<T*>(srcAddr);
+    size_t sz = size / sizeof(T);
+    size_t of = array_offset / sizeof(T);
+    for (size_t i = 0; i < sz; ++i) {
+        array->Set(i + of, *(src + i));
+    }
+}
+
+template<typename T>
+static void copyFromArray(jlong dstAddr, mirror::PrimitiveArray<T>* array,
+                          size_t array_offset,
+                          size_t size)
+        SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
+    T* dst = reinterpret_cast<T*>(dstAddr);
+    size_t sz = size / sizeof(T);
+    size_t of = array_offset / sizeof(T);
+    for (size_t i = 0; i < sz; ++i) {
+        *(dst + i) = array->Get(i + of);
+    }
+}
+
+static void Unsafe_copyMemoryToPrimitiveArray(JNIEnv *env,
+                                              jobject unsafe,
+                                              jlong srcAddr,
+                                              jobject dstObj,
+                                              jlong dstOffset,
+                                              jlong size) {
+    ScopedObjectAccess soa(env);
+    if (size == 0) {
+        return;
+    }
+    // size is nonnegative and fits into size_t
+    if (size < 0 || size != (jlong)(size_t) size) {
+        ThrowIllegalAccessException("wrong number of bytes");
+    }
+    size_t sz = (size_t)size;
+    size_t dst_offset = (size_t)dstOffset;
+    mirror::Object* dst = soa.Decode<mirror::Object*>(dstObj);
+    mirror::Class* component_type = dst->GetClass()->GetComponentType();
+    if (component_type->IsPrimitiveByte() || component_type->IsPrimitiveBoolean()) {
+        copyToArray(srcAddr, dst->AsByteSizedArray(), dst_offset, sz);
+    } else if (component_type->IsPrimitiveShort() || component_type->IsPrimitiveChar()) {
+        copyToArray(srcAddr, dst->AsShortSizedArray(), dst_offset, sz);
+    } else if (component_type->IsPrimitiveInt() || component_type->IsPrimitiveFloat()) {
+        copyToArray(srcAddr, dst->AsIntArray(), dst_offset, sz);
+    } else if (component_type->IsPrimitiveLong() || component_type->IsPrimitiveDouble()) {
+        copyToArray(srcAddr, dst->AsLongArray(), dst_offset, sz);
+    } else {
+        ThrowIllegalAccessException("not a primitive array");
+    }
+}
+
+static void Unsafe_copyMemoryFromPrimitiveArray(JNIEnv *env,
+                                                jobject unsafe,
+                                                jobject srcObj,
+                                                jlong srcOffset,
+                                                jlong dstAddr,
+                                                jlong size) {
+    ScopedObjectAccess soa(env);
+    if (size == 0) {
+        return;
+    }
+    // size is nonnegative and fits into size_t
+    if (size < 0 || size != (jlong)(size_t) size) {
+        ThrowIllegalAccessException("wrong number of bytes");
+    }
+    size_t sz = (size_t)size;
+    size_t src_offset = (size_t)srcOffset;
+    mirror::Object* src = soa.Decode<mirror::Object*>(srcObj);
+    mirror::Class* component_type = src->GetClass()->GetComponentType();
+    if (component_type->IsPrimitiveByte() || component_type->IsPrimitiveBoolean()) {
+        copyFromArray(dstAddr, src->AsByteSizedArray(), src_offset, sz);
+    } else if (component_type->IsPrimitiveShort() || component_type->IsPrimitiveChar()) {
+        copyFromArray(dstAddr, src->AsShortSizedArray(), src_offset, sz);
+    } else if (component_type->IsPrimitiveInt() || component_type->IsPrimitiveFloat()) {
+        copyFromArray(dstAddr, src->AsIntArray(), src_offset, sz);
+    } else if (component_type->IsPrimitiveLong() || component_type->IsPrimitiveDouble()) {
+        copyFromArray(dstAddr, src->AsLongArray(), src_offset, sz);
+    } else {
+        ThrowIllegalAccessException("not a primitive array");
+    }
+}
+static jboolean Unsafe_getBoolean(JNIEnv* env, jobject, jobject javaObj, jlong offset) {
+    ScopedFastNativeObjectAccess soa(env);
+    mirror::Object* obj = soa.Decode<mirror::Object*>(javaObj);
+    return obj->GetFieldBoolean(MemberOffset(offset));
+}
+
+static void Unsafe_putBoolean(JNIEnv* env, jobject, jobject javaObj, jlong offset, jboolean newValue) {
+    ScopedFastNativeObjectAccess soa(env);
+    mirror::Object* obj = soa.Decode<mirror::Object*>(javaObj);
+    // JNI must use non transactional mode (SetField8 is non-transactional).
+    obj->SetFieldBoolean<false>(MemberOffset(offset), newValue);
+}
+
+static jbyte Unsafe_getByte(JNIEnv* env, jobject, jobject javaObj, jlong offset) {
+    ScopedFastNativeObjectAccess soa(env);
+    mirror::Object* obj = soa.Decode<mirror::Object*>(javaObj);
+    return obj->GetFieldByte(MemberOffset(offset));
+}
+
+static void Unsafe_putByte(JNIEnv* env, jobject, jobject javaObj, jlong offset, jbyte newValue) {
+    ScopedFastNativeObjectAccess soa(env);
+    mirror::Object* obj = soa.Decode<mirror::Object*>(javaObj);
+    // JNI must use non transactional mode.
+    obj->SetFieldByte<false>(MemberOffset(offset), newValue);
+}
+
+static jchar Unsafe_getChar(JNIEnv* env, jobject, jobject javaObj, jlong offset) {
+    ScopedFastNativeObjectAccess soa(env);
+    mirror::Object* obj = soa.Decode<mirror::Object*>(javaObj);
+    return obj->GetFieldChar(MemberOffset(offset));
+}
+
+static void Unsafe_putChar(JNIEnv* env, jobject, jobject javaObj, jlong offset, jchar newValue) {
+    ScopedFastNativeObjectAccess soa(env);
+    mirror::Object* obj = soa.Decode<mirror::Object*>(javaObj);
+    // JNI must use non transactional mode.
+    obj->SetFieldChar<false>(MemberOffset(offset), newValue);
+}
+
+static jshort Unsafe_getShort(JNIEnv* env, jobject, jobject javaObj, jlong offset) {
+    ScopedFastNativeObjectAccess soa(env);
+    mirror::Object* obj = soa.Decode<mirror::Object*>(javaObj);
+    return obj->GetFieldShort(MemberOffset(offset));
+}
+
+static void Unsafe_putShort(JNIEnv* env, jobject, jobject javaObj, jlong offset, jshort newValue) {
+    ScopedFastNativeObjectAccess soa(env);
+    mirror::Object* obj = soa.Decode<mirror::Object*>(javaObj);
+    // JNI must use non transactional mode.
+    obj->SetFieldShort<false>(MemberOffset(offset), newValue);
+}
+
+static jfloat Unsafe_getFloat(JNIEnv* env, jobject, jobject javaObj, jlong offset) {
+  ScopedFastNativeObjectAccess soa(env);
+  mirror::Object* obj = soa.Decode<mirror::Object*>(javaObj);
+  union {int32_t val; jfloat converted;} conv;
+  conv.val = obj->GetField32(MemberOffset(offset));
+  return conv.converted;
+}
+
+static void Unsafe_putFloat(JNIEnv* env, jobject, jobject javaObj, jlong offset, jfloat newValue) {
+  ScopedFastNativeObjectAccess soa(env);
+  mirror::Object* obj = soa.Decode<mirror::Object*>(javaObj);
+  union {int32_t converted; jfloat val;} conv;
+  conv.val = newValue;
+  // JNI must use non transactional mode.
+  obj->SetField32<false>(MemberOffset(offset), conv.converted);
+}
+
+static jdouble Unsafe_getDouble(JNIEnv* env, jobject, jobject javaObj, jlong offset) {
+  ScopedFastNativeObjectAccess soa(env);
+  mirror::Object* obj = soa.Decode<mirror::Object*>(javaObj);
+  union {int64_t val; jdouble converted;} conv;
+  conv.val = obj->GetField64(MemberOffset(offset));
+  return conv.converted;
+}
+
+static void Unsafe_putDouble(JNIEnv* env, jobject, jobject javaObj, jlong offset, jdouble newValue) {
+  ScopedFastNativeObjectAccess soa(env);
+  mirror::Object* obj = soa.Decode<mirror::Object*>(javaObj);
+  union {int64_t converted; jdouble val;} conv;
+  conv.val = newValue;
+  // JNI must use non transactional mode.
+  obj->SetField64<false>(MemberOffset(offset), conv.converted);
+}
+
 static JNINativeMethod gMethods[] = {
   NATIVE_METHOD(Unsafe, compareAndSwapInt, "!(Ljava/lang/Object;JII)Z"),
   NATIVE_METHOD(Unsafe, compareAndSwapLong, "!(Ljava/lang/Object;JJJ)Z"),
@@ -206,6 +487,41 @@
   NATIVE_METHOD(Unsafe, putOrderedObject, "!(Ljava/lang/Object;JLjava/lang/Object;)V"),
   NATIVE_METHOD(Unsafe, getArrayBaseOffsetForComponentType, "!(Ljava/lang/Class;)I"),
   NATIVE_METHOD(Unsafe, getArrayIndexScaleForComponentType, "!(Ljava/lang/Class;)I"),
+  NATIVE_METHOD(Unsafe, addressSize, "!()I"),
+  NATIVE_METHOD(Unsafe, pageSize, "!()I"),
+  NATIVE_METHOD(Unsafe, allocateMemory, "!(J)J"),
+  NATIVE_METHOD(Unsafe, freeMemory, "!(J)V"),
+  NATIVE_METHOD(Unsafe, setMemory, "!(JJB)V"),
+  NATIVE_METHOD(Unsafe, getByte$, "!(J)B"),
+  NATIVE_METHOD(Unsafe, putByte$, "!(JB)V"),
+  NATIVE_METHOD(Unsafe, getShort$, "!(J)S"),
+  NATIVE_METHOD(Unsafe, putShort$, "!(JS)V"),
+  NATIVE_METHOD(Unsafe, getChar$, "!(J)C"),
+  NATIVE_METHOD(Unsafe, putChar$, "!(JC)V"),
+  NATIVE_METHOD(Unsafe, getInt$, "!(J)I"),
+  NATIVE_METHOD(Unsafe, putInt$, "!(JI)V"),
+  NATIVE_METHOD(Unsafe, getLong$, "!(J)J"),
+  NATIVE_METHOD(Unsafe, putLong$, "!(JJ)V"),
+  NATIVE_METHOD(Unsafe, getFloat$, "!(J)F"),
+  NATIVE_METHOD(Unsafe, putFloat$, "!(JF)V"),
+  NATIVE_METHOD(Unsafe, getDouble$, "!(J)D"),
+  NATIVE_METHOD(Unsafe, putDouble$, "!(JD)V"),
+  NATIVE_METHOD(Unsafe, getAddress, "!(J)J"),
+  NATIVE_METHOD(Unsafe, copyMemory, "!(JJJ)V"),
+  NATIVE_METHOD(Unsafe, copyMemoryToPrimitiveArray, "!(JLjava/lang/Object;JJ)V"),
+  NATIVE_METHOD(Unsafe, copyMemoryFromPrimitiveArray, "!(Ljava/lang/Object;JJJ)V"),
+  NATIVE_METHOD(Unsafe, getBoolean, "!(Ljava/lang/Object;J)Z"),
+  NATIVE_METHOD(Unsafe, getByte, "!(Ljava/lang/Object;J)B"),
+  NATIVE_METHOD(Unsafe, getChar, "!(Ljava/lang/Object;J)C"),
+  NATIVE_METHOD(Unsafe, getShort, "!(Ljava/lang/Object;J)S"),
+  NATIVE_METHOD(Unsafe, getFloat, "!(Ljava/lang/Object;J)F"),
+  NATIVE_METHOD(Unsafe, getDouble, "!(Ljava/lang/Object;J)D"),
+  NATIVE_METHOD(Unsafe, putBoolean, "!(Ljava/lang/Object;JZ)V"),
+  NATIVE_METHOD(Unsafe, putByte, "!(Ljava/lang/Object;JB)V"),
+  NATIVE_METHOD(Unsafe, putChar, "!(Ljava/lang/Object;JC)V"),
+  NATIVE_METHOD(Unsafe, putShort, "!(Ljava/lang/Object;JS)V"),
+  NATIVE_METHOD(Unsafe, putFloat, "!(Ljava/lang/Object;JF)V"),
+  NATIVE_METHOD(Unsafe, putDouble, "!(Ljava/lang/Object;JD)V"),
 };
 
 void register_sun_misc_Unsafe(JNIEnv* env) {
diff --git a/runtime/oat_file_assistant_test.cc b/runtime/oat_file_assistant_test.cc
index 570c59c..2798d58 100644
--- a/runtime/oat_file_assistant_test.cc
+++ b/runtime/oat_file_assistant_test.cc
@@ -956,7 +956,7 @@
 
   // We use the lib core dex file, because it's large, and hopefully should
   // take a while to generate.
-  Copy(GetLibCoreDexFileName(), dex_location);
+  Copy(GetLibCoreDexFileNames()[0], dex_location);
 
   const int kNumThreads = 32;
   Thread* self = Thread::Current();
diff --git a/runtime/parsed_options_test.cc b/runtime/parsed_options_test.cc
index a8575de..eee4910 100644
--- a/runtime/parsed_options_test.cc
+++ b/runtime/parsed_options_test.cc
@@ -34,18 +34,28 @@
   void* test_abort = reinterpret_cast<void*>(0xb);
   void* test_exit = reinterpret_cast<void*>(0xc);
 
-  std::string lib_core(CommonRuntimeTest::GetLibCoreDexFileName());
-
   std::string boot_class_path;
+  std::string class_path;
   boot_class_path += "-Xbootclasspath:";
-  boot_class_path += lib_core;
+
+  bool first_dex_file = true;
+  for (const std::string &dex_file_name :
+           CommonRuntimeTest::GetLibCoreDexFileNames()) {
+    if (!first_dex_file) {
+      class_path += ":";
+    } else {
+      first_dex_file = false;
+    }
+    class_path += dex_file_name;
+  }
+  boot_class_path += class_path;
 
   RuntimeOptions options;
   options.push_back(std::make_pair(boot_class_path.c_str(), nullptr));
   options.push_back(std::make_pair("-classpath", nullptr));
-  options.push_back(std::make_pair(lib_core.c_str(), nullptr));
+  options.push_back(std::make_pair(class_path.c_str(), nullptr));
   options.push_back(std::make_pair("-cp", nullptr));
-  options.push_back(std::make_pair(lib_core.c_str(), nullptr));
+  options.push_back(std::make_pair(class_path.c_str(), nullptr));
   options.push_back(std::make_pair("-Ximage:boot_image", nullptr));
   options.push_back(std::make_pair("-Xcheck:jni", nullptr));
   options.push_back(std::make_pair("-Xms2048", nullptr));
@@ -69,8 +79,8 @@
 #define EXPECT_PARSED_EQ(expected, actual_key) EXPECT_EQ(expected, map.GetOrDefault(actual_key))
 #define EXPECT_PARSED_EXISTS(actual_key) EXPECT_TRUE(map.Exists(actual_key))
 
-  EXPECT_PARSED_EQ(lib_core, Opt::BootClassPath);
-  EXPECT_PARSED_EQ(lib_core, Opt::ClassPath);
+  EXPECT_PARSED_EQ(class_path, Opt::BootClassPath);
+  EXPECT_PARSED_EQ(class_path, Opt::ClassPath);
   EXPECT_PARSED_EQ(std::string("boot_image"), Opt::Image);
   EXPECT_PARSED_EXISTS(Opt::CheckJni);
   EXPECT_PARSED_EQ(2048U, Opt::MemoryInitialSize);
diff --git a/runtime/runtime.cc b/runtime/runtime.cc
index 93f66ec..d4917a3 100644
--- a/runtime/runtime.cc
+++ b/runtime/runtime.cc
@@ -1140,15 +1140,21 @@
   // Then set up the native methods provided by the runtime itself.
   RegisterRuntimeNativeMethods(env);
 
-  // Then set up libcore, which is just a regular JNI library with a regular JNI_OnLoad.
-  // Most JNI libraries can just use System.loadLibrary, but libcore can't because it's
-  // the library that implements System.loadLibrary!
+  // Then set up libjavacore / libflavacore, which are just a regular JNI libraries with
+  // a regular JNI_OnLoad. Most JNI libraries can just use System.loadLibrary, but
+  // libcore can't because it's the library that implements System.loadLibrary!
   {
     std::string reason;
     if (!java_vm_->LoadNativeLibrary(env, "libjavacore.so", nullptr, &reason)) {
       LOG(FATAL) << "LoadNativeLibrary failed for \"libjavacore.so\": " << reason;
     }
   }
+  {
+    std::string reason;
+    if (!java_vm_->LoadNativeLibrary(env, "libxxavacore.so", nullptr, &reason)) {
+      LOG(FATAL) << "LoadNativeLibrary failed for \"libxxavacore.so\": " << reason;
+    }
+  }
 
   // Initialize well known classes that may invoke runtime native methods.
   WellKnownClasses::LateInit(env);
diff --git a/runtime/well_known_classes.cc b/runtime/well_known_classes.cc
index 0c7cce9..7e6fc86 100644
--- a/runtime/well_known_classes.cc
+++ b/runtime/well_known_classes.cc
@@ -260,7 +260,7 @@
   java_lang_Thread_init = CacheMethod(env, java_lang_Thread, false, "<init>", "(Ljava/lang/ThreadGroup;Ljava/lang/String;IZ)V");
   java_lang_Thread_run = CacheMethod(env, java_lang_Thread, false, "run", "()V");
   java_lang_Thread__UncaughtExceptionHandler_uncaughtException = CacheMethod(env, java_lang_Thread__UncaughtExceptionHandler, false, "uncaughtException", "(Ljava/lang/Thread;Ljava/lang/Throwable;)V");
-  java_lang_ThreadGroup_removeThread = CacheMethod(env, java_lang_ThreadGroup, false, "removeThread", "(Ljava/lang/Thread;)V");
+  java_lang_ThreadGroup_removeThread = CacheMethod(env, java_lang_ThreadGroup, false, "threadTerminated", "(Ljava/lang/Thread;)V");
   java_nio_DirectByteBuffer_init = CacheMethod(env, java_nio_DirectByteBuffer, false, "<init>", "(JI)V");
   org_apache_harmony_dalvik_ddmc_DdmServer_broadcast = CacheMethod(env, org_apache_harmony_dalvik_ddmc_DdmServer, true, "broadcast", "(I)V");
   org_apache_harmony_dalvik_ddmc_DdmServer_dispatch = CacheMethod(env, org_apache_harmony_dalvik_ddmc_DdmServer, true, "dispatch", "(I[BII)Lorg/apache/harmony/dalvik/ddmc/Chunk;");
@@ -330,9 +330,9 @@
   java_lang_Thread_lock = CacheField(env, java_lang_Thread, false, "lock", "Ljava/lang/Object;");
   java_lang_Thread_name = CacheField(env, java_lang_Thread, false, "name", "Ljava/lang/String;");
   java_lang_Thread_priority = CacheField(env, java_lang_Thread, false, "priority", "I");
-  java_lang_Thread_uncaughtHandler = CacheField(env, java_lang_Thread, false, "uncaughtHandler", "Ljava/lang/Thread$UncaughtExceptionHandler;");
+  java_lang_Thread_uncaughtHandler = CacheField(env, java_lang_Thread, false, "uncaughtExceptionHandler", "Ljava/lang/Thread$UncaughtExceptionHandler;");
   java_lang_Thread_nativePeer = CacheField(env, java_lang_Thread, false, "nativePeer", "J");
-  java_lang_ThreadGroup_groups = CacheField(env, java_lang_ThreadGroup, false, "groups", "Ljava/util/List;");
+  java_lang_ThreadGroup_groups = CacheField(env, java_lang_ThreadGroup, false, "groups", "[Ljava/lang/ThreadGroup;");
   java_lang_ThreadGroup_mainThreadGroup = CacheField(env, java_lang_ThreadGroup, true, "mainThreadGroup", "Ljava/lang/ThreadGroup;");
   java_lang_ThreadGroup_name = CacheField(env, java_lang_ThreadGroup, false, "name", "Ljava/lang/String;");
   java_lang_ThreadGroup_parent = CacheField(env, java_lang_ThreadGroup, false, "parent", "Ljava/lang/ThreadGroup;");
@@ -340,13 +340,13 @@
   java_lang_Throwable_cause = CacheField(env, java_lang_Throwable, false, "cause", "Ljava/lang/Throwable;");
   java_lang_Throwable_detailMessage = CacheField(env, java_lang_Throwable, false, "detailMessage", "Ljava/lang/String;");
   java_lang_Throwable_stackTrace = CacheField(env, java_lang_Throwable, false, "stackTrace", "[Ljava/lang/StackTraceElement;");
-  java_lang_Throwable_stackState = CacheField(env, java_lang_Throwable, false, "stackState", "Ljava/lang/Object;");
+  java_lang_Throwable_stackState = CacheField(env, java_lang_Throwable, false, "backtrace", "Ljava/lang/Object;");
   java_lang_Throwable_suppressedExceptions = CacheField(env, java_lang_Throwable, false, "suppressedExceptions", "Ljava/util/List;");
   java_lang_reflect_AbstractMethod_artMethod = CacheField(env, java_lang_reflect_AbstractMethod, false, "artMethod", "J");
   java_lang_reflect_Proxy_h = CacheField(env, java_lang_reflect_Proxy, false, "h", "Ljava/lang/reflect/InvocationHandler;");
   java_nio_DirectByteBuffer_capacity = CacheField(env, java_nio_DirectByteBuffer, false, "capacity", "I");
-  java_nio_DirectByteBuffer_effectiveDirectAddress = CacheField(env, java_nio_DirectByteBuffer, false, "effectiveDirectAddress", "J");
-  java_util_ArrayList_array = CacheField(env, java_util_ArrayList, false, "array", "[Ljava/lang/Object;");
+  java_nio_DirectByteBuffer_effectiveDirectAddress = CacheField(env, java_nio_DirectByteBuffer, false, "address", "J");
+  java_util_ArrayList_array = CacheField(env, java_util_ArrayList, false, "elementData", "[Ljava/lang/Object;");
   java_util_ArrayList_size = CacheField(env, java_util_ArrayList, false, "size", "I");
   java_util_Collections_EMPTY_LIST = CacheField(env, java_util_Collections, true, "EMPTY_LIST", "Ljava/util/List;");
   libcore_util_EmptyArray_STACK_TRACE_ELEMENT = CacheField(env, libcore_util_EmptyArray, true, "STACK_TRACE_ELEMENT", "[Ljava/lang/StackTraceElement;");
diff --git a/runtime/zip_archive_test.cc b/runtime/zip_archive_test.cc
index aded30c..4fc7ee2 100644
--- a/runtime/zip_archive_test.cc
+++ b/runtime/zip_archive_test.cc
@@ -32,7 +32,7 @@
 
 TEST_F(ZipArchiveTest, FindAndExtract) {
   std::string error_msg;
-  std::unique_ptr<ZipArchive> zip_archive(ZipArchive::Open(GetLibCoreDexFileName().c_str(), &error_msg));
+  std::unique_ptr<ZipArchive> zip_archive(ZipArchive::Open(GetLibCoreDexFileNames()[0].c_str(), &error_msg));
   ASSERT_TRUE(zip_archive.get() != nullptr) << error_msg;
   ASSERT_TRUE(error_msg.empty());
   std::unique_ptr<ZipEntry> zip_entry(zip_archive->Find("classes.dex", &error_msg));