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------------------------------------------------------------------------------

--                                                                          --

--                 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) 1999-2009, 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.       --

-- 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 if the stack is blown.

      --  It returns a C99 bool.

      function rtems_stack_checker_is_blown return Interfaces.C.unsigned_char;

      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;