RTEMS: Use TLS for Ada run-time

Do not use the RTEMS-specific task variables for the Ada run-time since
they are not available in RTEMS 4.12 or later.  Use thread-local storage
instead.

gcc/ada
	* Makefile.in (rtems): Use TLS implementation for s-tpopsp.adb.
	* s-tpopsp-rtems.adb: Delete.

From-SVN: r248952

gcc/ada/ChangeLog

+2017-06-07  Sebastian Huber  <sebastian.huber@embedded-brains.de>
+
+	* Makefile.in (rtems): Use TLS implementation for s-tpopsp.adb.
+	* s-tpopsp-rtems.adb: Delete.
+
 2017-06-02  Olivier Hainque  <hainque@adacore.com>
 
 	* vx_crtbegin_auto.c: New file.

gcc/ada/gcc-interface/Makefile.in

@@ -1745,7 +1745,7 @@ ifeq ($(strip $(filter-out rtems%,$(target_os))),)
   s-parame.adb<s-parame-rtems.adb \
   s-taprop.adb<s-taprop-posix.adb \
   s-taspri.ads<s-taspri-posix.ads \
-  s-tpopsp.adb<s-tpopsp-rtems.adb \
+  s-tpopsp.adb<s-tpopsp-tls.adb \
   s-stchop.adb<s-stchop-rtems.adb \
   s-interr.adb<s-interr-vxworks.adb
 endif

gcc/ada/s-tpopsp-rtems.adb

-------------------------------------------------------------------------------
---                                                                          --
---                GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS               --
---                                                                          --
---    S Y S T E M . T A S K _ P R I M I T I V E S . O P E R A T I O N S .   --
---                              S P E C I F I C                             --
---                                                                          --
---                                  B o d y                                 --
---                                                                          --
---                             $Revision: 1.2 $
---                                                                          --
---            Copyright (C) 1991-2003, Florida State University             --
---            Copyright (C) 2008-2012, Free Software Foundation, Inc.       --
---                                                                          --
--- GNARL is free software; you can  redistribute it  and/or modify it under --
--- terms of the  GNU General Public License as published  by the Free Soft- --
--- ware  Foundation;  either version 3,  or (at your option) any later ver- --
--- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
--- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
--- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
---                                                                          --
--- As a special exception under Section 7 of GPL version 3, you are granted --
--- additional permissions described in the GCC Runtime Library Exception,   --
--- version 3.1, as published by the Free Software Foundation.               --
---                                                                          --
--- You should have received a copy of the GNU General Public License and    --
--- a copy of the GCC Runtime Library Exception along with this program;     --
--- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
--- <http://www.gnu.org/licenses/>.                                          --
---                                                                          --
--- GNARL was developed by the GNARL team at Florida State University. It is --
--- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
--- State University (http://www.gnat.com).                                  --
---                                                                          --
-------------------------------------------------------------------------------
-
---  This is a RTEMS version of this package which uses a special
---  variable for Ada self which is context switched implicitly by RTEMS.
---
---  This is the same as the POSIX version except that an RTEMS variable
---  is used instead of a POSIX key.
-
-separate (System.Task_Primitives.Operations)
-package body Specific is
-
-   --  The following gives the Ada run-time direct access to a variable
-   --  context switched by RTEMS at the lowest level.
-
-   ATCB_Key : System.Address;
-   pragma Import (C, ATCB_Key, "rtems_ada_self");
-
-   ----------------
-   -- Initialize --
-   ----------------
-
-   procedure Initialize (Environment_Task : Task_Id) is
-      pragma Warnings (Off, Environment_Task);
-
-   begin
-      ATCB_Key := To_Address (Environment_Task);
-   end Initialize;
-
-   -------------------
-   -- Is_Valid_Task --
-   -------------------
-
-   function Is_Valid_Task return Boolean is
-   begin
-      return ATCB_Key /= System.Null_Address;
-   end Is_Valid_Task;
-
-   ---------
-   -- Set --
-   ---------
-
-   procedure Set (Self_Id : Task_Id) is
-   begin
-      ATCB_Key := To_Address (Self_Id);
-   end Set;
-
-   ----------
-   -- Self --
-   ----------
-
-   --  To make Ada tasks and C threads interoperate better, we have added some
-   --  functionality to Self. Suppose a C main program (with threads) calls an
-   --  Ada procedure and the Ada procedure calls the tasking runtime system.
-   --  Eventually, a call will be made to self. Since the call is not coming
-   --  from an Ada task, there will be no corresponding ATCB.
-
-   --  What we do in Self is to catch references that do not come from
-   --  recognized Ada tasks, and create an ATCB for the calling thread.
-
-   --  The new ATCB will be "detached" from the normal Ada task master
-   --  hierarchy, much like the existing implicitly created signal-server
-   --  tasks.
-
-   function Self return Task_Id is
-      Result : System.Address;
-
-   begin
-      Result := ATCB_Key;
-
-      --  If the key value is Null, then it is a non-Ada task.
-
-      if Result /= System.Null_Address then
-         return To_Task_Id (Result);
-      else
-         return Register_Foreign_Thread;
-      end if;
-   end Self;
-
-end Specific;