system: Add gcov command

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

system/gcov/Kconfig

@@ -0,0 +1,29 @@
+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+config SYSTEM_GCOV
+	tristate "gcov tool"
+	depends on ARCH_COVERAGE
+	---help---
+		Enable support for the 'gcov' command.
+
+if SYSTEM_GCOV
+
+config SYSTEM_GCOV_PROGNAME
+	string "gcov program name"
+	default "gcov"
+	---help---
+		This is the name of the program that will be used when the NSH ELF
+		program is installed.
+
+config SYSTEM_GCOV_PRIORITY
+	int "gcov task priority"
+	default 100
+
+config SYSTEM_GCOV_STACKSIZE
+	int "gcov stack size"
+	default DEFAULT_TASK_STACKSIZE
+
+endif

system/gcov/Make.defs

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+############################################################################
+# apps/system/gcov/Make.defs
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you 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.
+#
+############################################################################
+
+ifneq ($(CONFIG_SYSTEM_GCOV),)
+CONFIGURED_APPS += $(APPDIR)/system/gcov
+endif

system/gcov/Makefile

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+############################################################################
+# apps/system/gcov/Makefile
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you 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 $(APPDIR)/Make.defs
+
+PROGNAME = $(CONFIG_SYSTEM_GCOV_PROGNAME)
+PRIORITY = $(CONFIG_SYSTEM_GCOV_PRIORITY)
+STACKSIZE = $(CONFIG_SYSTEM_GCOV_STACKSIZE)
+MODULE = $(CONFIG_SYSTEM_GCOV)
+MAINSRC = gcov.c
+
+include $(APPDIR)/Application.mk

system/gcov/gcov.c

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+/****************************************************************************
+ * apps/system/gcov/gcov.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdio.h>
+#include <unistd.h>
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: show_usage
+ ****************************************************************************/
+
+static void show_usage(FAR const char *progname)
+{
+  printf("\nUsage: %s [-d] [-r] [-h]\n", progname);
+  printf("\nWhere:\n");
+  printf("  -d dump the coverage.\n");
+  printf("  -r reset the coverage\n");
+  printf("  -h show this text and exits.\n");
+}
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+void __gcov_dump(void);
+void __gcov_reset(void);
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+int main(int argc, FAR char *argv[])
+{
+  int option;
+
+  while ((option = getopt(argc, argv, "drh")) != ERROR)
+    {
+      switch (option)
+        {
+          case 'd':
+            __gcov_dump();
+            break;
+
+          case 'r':
+            __gcov_reset();
+            break;
+
+          case '?':
+          default:
+            fprintf(stderr, "ERROR: Unrecognized option\n");
+
+          case 'h':
+            show_usage(argv[0]);
+        }
+    }
+
+  return 0;
+}