libbinder: build on Trusty
Adds a new trusty/ subdirectory containing all the files
needed to build Binder RPC on Trusty, including:
* A RpcServerTrusty class used to create Trusty Binder services
* The underlying RpcTransportTipcTrusty transport that interfaces
between libbinder and TIPC
* Trusty implementations of some OS-specific functionality, like logging
* Make-based build file for libbinder in the Trusty build system
Bug: 224644083
Test: build Trusty
Change-Id: I25b97736d41489d20c2dd266e8e110764215378c
diff --git a/libs/binder/trusty/logging.cpp b/libs/binder/trusty/logging.cpp
new file mode 100644
index 0000000..fd54744
--- /dev/null
+++ b/libs/binder/trusty/logging.cpp
@@ -0,0 +1,166 @@
+/*
+ * Copyright (C) 2022 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 TLOG_TAG "libbinder"
+
+#include "android-base/logging.h"
+
+#include <trusty_log.h>
+#include <iostream>
+#include <string>
+
+#include <android-base/macros.h>
+#include <android-base/strings.h>
+
+namespace android {
+namespace base {
+
+static const char* GetFileBasename(const char* file) {
+ const char* last_slash = strrchr(file, '/');
+ if (last_slash != nullptr) {
+ return last_slash + 1;
+ }
+ return file;
+}
+
+// This splits the message up line by line, by calling log_function with a pointer to the start of
+// each line and the size up to the newline character. It sends size = -1 for the final line.
+template <typename F, typename... Args>
+static void SplitByLines(const char* msg, const F& log_function, Args&&... args) {
+ const char* newline;
+ while ((newline = strchr(msg, '\n')) != nullptr) {
+ log_function(msg, newline - msg, args...);
+ msg = newline + 1;
+ }
+
+ log_function(msg, -1, args...);
+}
+
+void DefaultAborter(const char* abort_message) {
+ TLOGC("aborting: %s\n", abort_message);
+ abort();
+}
+
+static void TrustyLogLine(const char* msg, int length, android::base::LogSeverity severity,
+ const char* tag) {
+ switch (severity) {
+ case VERBOSE:
+ case DEBUG:
+ TLOGD("%s: %s\n", tag, msg);
+ break;
+ case INFO:
+ TLOGI("%s: %s\n", tag, msg);
+ break;
+ case WARNING:
+ TLOGW("%s: %s\n", tag, msg);
+ break;
+ case ERROR:
+ TLOGE("%s: %s\n", tag, msg);
+ break;
+ case FATAL_WITHOUT_ABORT:
+ case FATAL:
+ TLOGC("%s: %s\n", tag, msg);
+ break;
+ }
+}
+
+void TrustyLogger(android::base::LogId, android::base::LogSeverity severity, const char* tag,
+ const char*, unsigned int, const char* full_message) {
+ SplitByLines(full_message, TrustyLogLine, severity, tag);
+}
+
+// This indirection greatly reduces the stack impact of having lots of
+// checks/logging in a function.
+class LogMessageData {
+public:
+ LogMessageData(const char* file, unsigned int line, LogSeverity severity, const char* tag,
+ int error)
+ : file_(GetFileBasename(file)),
+ line_number_(line),
+ severity_(severity),
+ tag_(tag),
+ error_(error) {}
+
+ const char* GetFile() const { return file_; }
+
+ unsigned int GetLineNumber() const { return line_number_; }
+
+ LogSeverity GetSeverity() const { return severity_; }
+
+ const char* GetTag() const { return tag_; }
+
+ int GetError() const { return error_; }
+
+ std::ostream& GetBuffer() { return buffer_; }
+
+ std::string ToString() const { return buffer_.str(); }
+
+private:
+ std::ostringstream buffer_;
+ const char* const file_;
+ const unsigned int line_number_;
+ const LogSeverity severity_;
+ const char* const tag_;
+ const int error_;
+
+ DISALLOW_COPY_AND_ASSIGN(LogMessageData);
+};
+
+LogMessage::LogMessage(const char* file, unsigned int line, LogId, LogSeverity severity,
+ const char* tag, int error)
+ : LogMessage(file, line, severity, tag, error) {}
+
+LogMessage::LogMessage(const char* file, unsigned int line, LogSeverity severity, const char* tag,
+ int error)
+ : data_(new LogMessageData(file, line, severity, tag, error)) {}
+
+LogMessage::~LogMessage() {
+ // Check severity again. This is duplicate work wrt/ LOG macros, but not LOG_STREAM.
+ if (!WOULD_LOG(data_->GetSeverity())) {
+ return;
+ }
+
+ // Finish constructing the message.
+ if (data_->GetError() != -1) {
+ data_->GetBuffer() << ": " << strerror(data_->GetError());
+ }
+ std::string msg(data_->ToString());
+
+ LogLine(data_->GetFile(), data_->GetLineNumber(), data_->GetSeverity(), data_->GetTag(),
+ msg.c_str());
+
+ // Abort if necessary.
+ if (data_->GetSeverity() == FATAL) {
+ DefaultAborter(msg.c_str());
+ }
+}
+
+std::ostream& LogMessage::stream() {
+ return data_->GetBuffer();
+}
+
+void LogMessage::LogLine(const char* file, unsigned int line, LogSeverity severity, const char* tag,
+ const char* message) {
+ TrustyLogger(DEFAULT, severity, tag ?: "<unknown>", file, line, message);
+}
+
+bool ShouldLog(LogSeverity severity, const char* tag) {
+ // This is controlled by Trusty's log level.
+ return true;
+}
+
+} // namespace base
+} // namespace android