s-stchop-rtems.adb: Add file missed in early commit.

2008-09-05  Joel Sherrill <joel.sherrill@oarcorp.com>

	* s-stchop-rtems.adb: Add file missed in early commit.  Already
	referenced in gcc-interface/Makefile.in.

From-SVN: r140042

gcc/ada/ChangeLog

@@ -1,3 +1,8 @@
+2008-09-05  Joel Sherrill <joel.sherrill@oarcorp.com>
+
+	* s-stchop-rtems.adb: Add file missed in early commit.  Already
+	referenced in gcc-interface/Makefile.in.
+
 2008-08-30  Thomas Quinot  <quinot@adacore.com>
 
 	* gcc-interface/Make-lang.in: Allow s-oscons.{o,ali} to

gcc/ada/s-stchop-rtems.adb

@@ -0,0 +1,114 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
+--                                                                          --
+--     S Y S T E M . S T A C K _ C H E C K I N G . O P E R A T I O N S      --
+--                                                                          --
+--                                  B o d y                                 --
+--                                                                          --
+--          Copyright (C) 1999-2008, 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 2,  or (at your option) any later ver- --
+-- sion. GNARL 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.  See the GNU General Public License --
+-- for  more details.  You should have  received  a copy of the GNU General --
+-- Public License  distributed with GNARL; see file COPYING.  If not, write --
+-- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
+-- Boston, MA 02110-1301, USA.                                              --
+--                                                                          --
+-- As a special exception,  if other files  instantiate  generics from this --
+-- unit, or you link  this unit with other files  to produce an executable, --
+-- this  unit  does not  by itself cause  the resulting  executable  to  be --
+-- covered  by the  GNU  General  Public  License.  This exception does not --
+-- however invalidate  any other reasons why  the executable file  might be --
+-- covered by the  GNU Public License.                                      --
+--                                                                          --
+-- GNARL was developed by the GNARL team at Florida State University.       --
+-- Extensive contributions were provided by Ada Core Technologies, Inc.     --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  This is the RTEMS version of this package.
+--  This file should be kept synchronized with the general implementation
+--  provided by s-stchop.adb.
+
+pragma Restrictions (No_Elaboration_Code);
+--  We want to guarantee the absence of elaboration code because the
+--  binder does not handle references to this package.
+
+with Ada.Exceptions;
+
+with Interfaces.C; use Interfaces.C;
+
+package body System.Stack_Checking.Operations is
+
+   ----------------------------
+   -- Invalidate_Stack_Cache --
+   ----------------------------
+
+   procedure Invalidate_Stack_Cache (Any_Stack : Stack_Access) is
+      pragma Warnings (Off, Any_Stack);
+   begin
+      Cache := Null_Stack;
+   end Invalidate_Stack_Cache;
+
+   -----------------------------
+   -- Notify_Stack_Attributes --
+   -----------------------------
+
+   procedure Notify_Stack_Attributes
+     (Initial_SP : System.Address;
+      Size       : System.Storage_Elements.Storage_Offset)
+   is
+
+      --  RTEMS keeps all the information we need.
+
+      pragma Unreferenced (Size);
+      pragma Unreferenced (Initial_SP);
+
+   begin
+      null;
+   end Notify_Stack_Attributes;
+
+   -----------------
+   -- Stack_Check --
+   -----------------
+
+   function Stack_Check
+     (Stack_Address : System.Address) return Stack_Access
+   is
+      pragma Unreferenced (Stack_Address);
+
+      --  RTEMS has a routine to check this.  So use it.
+      function rtems_stack_checker_is_blown return Interfaces.C.int;
+      pragma Import (C,
+         rtems_stack_checker_is_blown, "rtems_stack_checker_is_blown");
+
+   begin
+      --  RTEMS has a routine to check this.  So use it.
+
+      if rtems_stack_checker_is_blown /= 0 then
+         Ada.Exceptions.Raise_Exception
+           (E       => Storage_Error'Identity,
+            Message => "stack overflow detected");
+      end if;
+
+      return null;
+
+   end Stack_Check;
+
+   ------------------------
+   -- Update_Stack_Cache --
+   ------------------------
+
+   procedure Update_Stack_Cache (Stack : Stack_Access) is
+   begin
+      if not Multi_Processor then
+         Cache := Stack;
+      end if;
+   end Update_Stack_Cache;
+
+end System.Stack_Checking.Operations;