diff --git a/transport/Android.bp b/transport/Android.bp
index 324dbde..2d5d88c 100644
--- a/transport/Android.bp
+++ b/transport/Android.bp
@@ -91,6 +91,7 @@
         "HidlPassthroughSupport.cpp",
         "HidlTransportSupport.cpp",
         "HidlTransportUtils.cpp",
+        "LegacySupport.cpp",
         "ServiceManagement.cpp",
         "Static.cpp"
     ],
diff --git a/transport/LegacySupport.cpp b/transport/LegacySupport.cpp
new file mode 100644
index 0000000..866de5f
--- /dev/null
+++ b/transport/LegacySupport.cpp
@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2020 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.
+ */
+
+#define LOG_TAG "LegacySupport"
+
+#include <android/hidl/base/1.0/IBase.h>
+#include <hidl/HidlSupport.h>
+#include <hidl/LegacySupport.h>
+#include <hidl/ServiceManagement.h>
+#include <hidl/Status.h>
+
+using android::hidl::base::V1_0::IBase;
+
+namespace android::hardware {
+
+namespace details {
+
+__attribute__((warn_unused_result)) status_t registerPassthroughServiceImplementation(
+        const std::string& interfaceName, RegisterServiceBaseCb registerServiceCb,
+        const std::string& serviceName) {
+    sp<IBase> service =
+            getRawServiceInternal(interfaceName, serviceName, true /*retry*/, true /*getStub*/);
+
+    if (service == nullptr) {
+        ALOGE("Could not get passthrough implementation for %s/%s.", interfaceName.c_str(),
+              serviceName.c_str());
+        return EXIT_FAILURE;
+    }
+
+    LOG_FATAL_IF(service->isRemote(), "Implementation of %s/%s is remote!", interfaceName.c_str(),
+                 serviceName.c_str());
+
+    std::string actualName;
+    Return<void> result = service->interfaceDescriptor(
+            [&actualName](const hidl_string& descriptor) { actualName = descriptor; });
+    LOG_FATAL_IF(!result.isOk(), "Error retrieving interface name from %s/%s: %s",
+                 interfaceName.c_str(), serviceName.c_str(), result.description());
+    LOG_FATAL_IF(actualName != interfaceName, "Implementation of %s/%s is actually %s!",
+                 interfaceName.c_str(), serviceName.c_str(), actualName.c_str());
+
+    status_t status = registerServiceCb(service, serviceName);
+
+    if (status == OK) {
+        ALOGI("Registration complete for %s/%s.", interfaceName.c_str(), serviceName.c_str());
+    } else {
+        ALOGE("Could not register service %s/%s (%d).", interfaceName.c_str(), serviceName.c_str(),
+              status);
+    }
+
+    return status;
+}
+
+}  // namespace details
+
+__attribute__((warn_unused_result)) status_t registerPassthroughServiceImplementation(
+        const std::string& interfaceName, const std::string& serviceName) {
+    return details::registerPassthroughServiceImplementation(
+            interfaceName,
+            [](const sp<IBase>& service, const std::string& name) {
+                return details::registerAsServiceInternal(service, name);
+            },
+            serviceName);
+}
+
+}  // namespace android::hardware
diff --git a/transport/include/hidl/LegacySupport.h b/transport/include/hidl/LegacySupport.h
index 7cb72a9..c7ad594 100644
--- a/transport/include/hidl/LegacySupport.h
+++ b/transport/include/hidl/LegacySupport.h
@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+#include <string>
+
 #include <hidl/HidlLazyUtils.h>
 #include <hidl/HidlTransportSupport.h>
 #include <sys/wait.h>
@@ -59,6 +61,13 @@
 
     return status;
 }
+
+using RegisterServiceBaseCb = RegisterServiceCb<::android::hidl::base::V1_0::IBase>;
+
+__attribute__((warn_unused_result)) status_t registerPassthroughServiceImplementation(
+        const std::string& interfaceName, RegisterServiceBaseCb registerServiceCb,
+        const std::string& serviceName = "default");
+
 }  // namespace details
 
 /**
@@ -74,6 +83,9 @@
             name);
 }
 
+__attribute__((warn_unused_result)) status_t registerPassthroughServiceImplementation(
+        const std::string& interfaceName, const std::string& serviceName = "default");
+
 /**
  * Creates default passthrough service implementation. This method never returns.
  *