sched/backtrace: add sched_backtrace support

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

sched/sched/Make.defs

@@ -98,6 +98,10 @@ ifeq ($(CONFIG_SCHED_CRITMONITOR),y)
 CSRCS += sched_critmonitor.c
 endif
 
+ifeq ($(CONFIG_ARCH_HAVE_BACKTRACE),y)
+CSRCS += sched_backtrace.c
+endif
+
 # Include sched build support
 
 DEPPATH += --dep-path sched

sched/sched/sched_backtrace.c

@@ -0,0 +1,62 @@
+/****************************************************************************
+ * sched/sched/sched_backtrace.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 "sched.h"
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: sched_backtrace
+ *
+ * Description:
+ *  Get thread backtrace from specified tid.
+ *  Store up to SIZE return address of the current program state in
+ *  ARRAY and return the exact number of values stored.
+ *
+ ****************************************************************************/
+
+int sched_backtrace(pid_t tid, FAR void **buffer, int size)
+{
+  FAR struct tcb_s *rtcb;
+
+  if (tid < 0)
+    {
+      rtcb = running_task();
+    }
+  else
+    {
+      rtcb = nxsched_get_tcb(tid);
+    }
+
+  if (rtcb == NULL)
+    {
+      return 0;
+    }
+
+  return up_backtrace(rtcb, buffer, size);
+}