libc/execinfo: add dump_stack support

Signed-off-by: chao.an <anchao@xiaomi.com>

include/execinfo.h

@@ -25,10 +25,16 @@
  * Public Function Prototypes
  ****************************************************************************/
 
+#if defined(CONFIG_EABI_UNWINDER)
+
 /* Store up to SIZE return address of the current program state in
  * ARRAY and return the exact number of values stored.
  */
 
-extern int backtrace(FAR void **buffer, int size);
+extern int  backtrace(FAR void **buffer, int size);
+extern void dump_stack(void);
+#else
+# define dump_stack()
+#endif
 
 #endif /* __INCLUDE_EXECINFO_H */

libs/libc/debug/Make.defs

@@ -20,7 +20,7 @@
 
 ifeq ($(CONFIG_EABI_UNWINDER),y)
 
-CSRCS += lib_backtrace.c
+CSRCS += lib_backtrace.c lib_dumpstack.c
 
 endif
 

libs/libc/debug/lib_dumpstack.c

@@ -0,0 +1,68 @@
+/****************************************************************************
+ * libs/libc/debug/lib_dumpstack.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 <nuttx/config.h>
+
+#include <sys/types.h>
+
+#include <stdio.h>
+#include <syslog.h>
+#include <execinfo.h>
+
+#define DUMP_FORMAT "%*p"
+#define DUMP_WIDTH  (int)(2 * sizeof(FAR void *) + 3)
+
+#define DUMP_DEPTH  16
+#define DUMP_NITEM  8
+#define DUMP_LINESIZE (DUMP_NITEM * DUMP_WIDTH)
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+void dump_stack(void)
+{
+  FAR void *address[DUMP_DEPTH];
+  char line[DUMP_LINESIZE];
+  int ret = 0;
+  int size;
+  int i;
+
+  size = backtrace(address, DUMP_DEPTH);
+  if (size <= 0)
+    {
+      return;
+    }
+
+  for (i = 0; i < size; i++)
+    {
+      ret += snprintf(line + ret, sizeof(line) - ret,
+                      DUMP_FORMAT, DUMP_WIDTH, address[i]);
+      if (i == size - 1 || ret % DUMP_LINESIZE == 0)
+        {
+          syslog(LOG_INFO, "[BackTrace]: %s\n", line);
+          ret = 0;
+        }
+    }
+}