libs/libc/tls/tls_getinfo.c: Add tls_get_info()

Move the logic to get TLS information from an inline function to a normal function.  For the unaligned case, it is probably too large to be inlined.

Also fixes some minor things from review of previous commits.

include/nuttx/tls.h

@@ -1,35 +1,20 @@
 /****************************************************************************
  * include/nuttx/tls.h
  *
- *   Copyright (C) 2016 Gregory Nutt. All rights reserved.
- *   Author: Gregory Nutt <gnutt@nuttx.org>
+ * 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
  *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
+ *   http://www.apache.org/licenses/LICENSE-2.0
  *
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- * 3. Neither the name NuttX nor the names of its contributors may be
- *    used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
+ * 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.
  *
  ****************************************************************************/
 
@@ -141,5 +126,26 @@ uintptr_t tls_get_element(int elem);
 
 void tls_set_element(int elem, uintptr_t value);
 
+/****************************************************************************
+ * Name: tls_get_info
+ *
+ * Description:
+ *   Return a reference to the tls_info_s structure.  This is used as part
+ *   of the internal implementation of tls_get/set_elem() and ONLY for the
+ *   where CONFIG_TLS_ALIGNED is *not* defined
+ *
+ * Input Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   A reference to the thread-specific tls_info_s structure is return on
+ *   success.  NULL would be returned in the event of any failure.
+ *
+ ****************************************************************************/
+
+#ifndef CONFIG_TLS_ALIGNED
+FAR struct tls_info_s *tls_get_info(void);
+#endif
+
 #endif /* CONFIG_TLS */
 #endif /* __INCLUDE_NUTTX_TLS_H */