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diff --git a/gcc/ada/s-interr.ads b/gcc/ada/s-interr.ads
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+------------------------------------------------------------------------------
+--                                                                          --
+--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
+--                                                                          --
+--                     S Y S T E M . I N T E R R U P T S                    --
+--                                                                          --
+--                                  S p e c                                 --
+--                                                                          --
+--          Copyright (C) 1992-2009, 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.     --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  Note: the compiler generates direct calls to this interface, via Rtsfind.
+--  Any changes to this interface may require corresponding compiler changes.
+
+--  This package encapsulates the implementation of interrupt or signal
+--  handlers. It is logically an extension of the body of Ada.Interrupts. It
+--  is made a child of System to allow visibility of various runtime system
+--  internal data and operations.
+
+--  See System.Interrupt_Management for core interrupt/signal interfaces
+
+--  These two packages are separated to allow System.Interrupt_Management to be
+--  used without requiring the whole tasking implementation to be linked and
+--  elaborated.
+
+with System.Tasking;
+with System.Tasking.Protected_Objects.Entries;
+with System.OS_Interface;
+
+package System.Interrupts is
+
+   pragma Elaborate_Body;
+   --  Comment needed on why this is here ???
+
+   -------------------------
+   -- Constants and types --
+   -------------------------
+
+   Default_Interrupt_Priority : constant System.Interrupt_Priority :=
+     System.Interrupt_Priority'Last;
+   --  Default value used when a pragma Interrupt_Handler or Attach_Handler is
+   --  specified without an Interrupt_Priority pragma, see D.3(10).
+
+   type Ada_Interrupt_ID is range 0 .. System.OS_Interface.Max_Interrupt;
+   --  Avoid inheritance by Ada.Interrupts.Interrupt_ID of unwanted operations
+
+   type Interrupt_ID is range 0 .. System.OS_Interface.Max_Interrupt;
+
+   subtype System_Interrupt_Id is Interrupt_ID;
+   --  This synonym is introduced so that the type is accessible through
+   --  rtsfind, otherwise the name clashes with its homonym in Ada.Interrupts.
+
+   type Parameterless_Handler is access protected procedure;
+
+   ----------------------
+   -- General services --
+   ----------------------
+
+   --  Attempt to attach a Handler to an Interrupt to which an Entry is
+   --  already bound will raise a Program_Error.
+
+   function Is_Reserved (Interrupt : Interrupt_ID) return Boolean;
+
+   function Is_Entry_Attached (Interrupt : Interrupt_ID) return Boolean;
+
+   function Is_Handler_Attached (Interrupt : Interrupt_ID) return Boolean;
+
+   function Current_Handler
+     (Interrupt : Interrupt_ID) return Parameterless_Handler;
+
+   --  Calling the following procedures with New_Handler = null and Static =
+   --  true means that we want to modify the current handler regardless of the
+   --  previous handler's binding status. (i.e. we do not care whether it is a
+   --  dynamic or static handler)
+
+   procedure Attach_Handler
+     (New_Handler : Parameterless_Handler;
+      Interrupt   : Interrupt_ID;
+      Static      : Boolean := False);
+
+   procedure Exchange_Handler
+     (Old_Handler : out Parameterless_Handler;
+      New_Handler : Parameterless_Handler;
+      Interrupt   : Interrupt_ID;
+      Static      : Boolean := False);
+
+   procedure Detach_Handler
+     (Interrupt : Interrupt_ID;
+      Static    : Boolean := False);
+
+   function Reference
+     (Interrupt : Interrupt_ID) return System.Address;
+
+   --------------------------------
+   -- Interrupt Entries Services --
+   --------------------------------
+
+   --  Routines needed for Interrupt Entries
+
+   procedure Bind_Interrupt_To_Entry
+     (T       : System.Tasking.Task_Id;
+      E       : System.Tasking.Task_Entry_Index;
+      Int_Ref : System.Address);
+   --  Bind the given interrupt to the given entry. If the interrupt is
+   --  already bound to another entry, Program_Error will be raised.
+
+   procedure Detach_Interrupt_Entries (T : System.Tasking.Task_Id);
+   --  This procedure detaches all the Interrupt Entries bound to a task
+
+   ------------------------------
+   -- POSIX.5 Signals Services --
+   ------------------------------
+
+   --  Routines needed for POSIX dot5 POSIX_Signals
+
+   procedure Block_Interrupt (Interrupt : Interrupt_ID);
+   --  Block the Interrupt on the process level
+
+   procedure Unblock_Interrupt (Interrupt : Interrupt_ID);
+
+   function Unblocked_By
+     (Interrupt : Interrupt_ID) return System.Tasking.Task_Id;
+   --  It returns the ID of the last Task which Unblocked this Interrupt.
+   --  It returns Null_Task if no tasks have ever requested the Unblocking
+   --  operation or the Interrupt is currently Blocked.
+
+   function Is_Blocked (Interrupt : Interrupt_ID) return Boolean;
+   --  Comment needed ???
+
+   procedure Ignore_Interrupt (Interrupt : Interrupt_ID);
+   --  Set the sigaction for the interrupt to SIG_IGN
+
+   procedure Unignore_Interrupt (Interrupt : Interrupt_ID);
+   --  Comment needed ???
+
+   function Is_Ignored (Interrupt : Interrupt_ID) return Boolean;
+   --  Comment needed ???
+
+   --  Note : Direct calls to sigaction, sigprocmask, thr_sigsetmask or any
+   --  other low-level interface that changes the signal action or signal mask
+   --  needs a careful thought.
+
+   --  One may achieve the effect of system calls first making RTS blocked (by
+   --  calling Block_Interrupt) for the signal under consideration. This will
+   --  make all the tasks in RTS blocked for the Interrupt.
+
+   ----------------------
+   -- Protection Types --
+   ----------------------
+
+   --  Routines and types needed to implement Interrupt_Handler and
+   --  Attach_Handler.
+
+   --  There are two kinds of protected objects that deal with interrupts:
+
+   --  (1) Only Interrupt_Handler pragmas are used. We need to be able to tell
+   --  if an Interrupt_Handler applies to a given procedure, so
+   --  Register_Interrupt_Handler has to be called for all the potential
+   --  handlers, it should be done by calling Register_Interrupt_Handler with
+   --  the handler code address. On finalization, which can happen only has
+   --  part of library level finalization since PO with Interrupt_Handler
+   --  pragmas can only be declared at library level, nothing special needs to
+   --  be done since the default handlers have been restored as part of task
+   --  completion which is done just before global finalization.
+   --  Dynamic_Interrupt_Protection should be used in this case.
+
+   --  (2) Attach_Handler pragmas are used, and possibly Interrupt_Handler
+   --  pragma. We need to attach the handlers to the given interrupts when the
+   --  object is elaborated. This should be done by constructing an array of
+   --  pairs (interrupt, handler) from the pragmas and calling Install_Handlers
+   --  with it (types to be used are New_Handler_Item and New_Handler_Array).
+   --  On finalization, we need to restore the handlers that were installed
+   --  before the elaboration of the PO, so we need to store these previous
+   --  handlers. This is also done by Install_Handlers, the room for these
+   --  informations is provided by adding a discriminant which is the number
+   --  of Attach_Handler pragmas and an array of this size in the protection
+   --  type, Static_Interrupt_Protection.
+
+   procedure Register_Interrupt_Handler
+     (Handler_Addr : System.Address);
+   --  This routine should be called by the compiler to allow the handler be
+   --  used as an Interrupt Handler. That means call this procedure for each
+   --  pragma Interrupt_Handler providing the address of the handler (not
+   --  including the pointer to the actual PO, this way this routine is called
+   --  only once for each type definition of PO).
+
+   type Static_Handler_Index is range 0 .. Integer'Last;
+   subtype Positive_Static_Handler_Index is
+     Static_Handler_Index range 1 .. Static_Handler_Index'Last;
+   --  Comment needed ???
+
+   type Previous_Handler_Item is record
+      Interrupt : Interrupt_ID;
+      Handler   : Parameterless_Handler;
+      Static    : Boolean;
+   end record;
+   --  Contains all the information needed to restore a previous handler
+
+   type Previous_Handler_Array is array
+     (Positive_Static_Handler_Index range <>) of Previous_Handler_Item;
+
+   type New_Handler_Item is record
+      Interrupt : Interrupt_ID;
+      Handler   : Parameterless_Handler;
+   end record;
+   --  Contains all the information from an Attach_Handler pragma
+
+   type New_Handler_Array is
+     array (Positive_Static_Handler_Index range <>) of New_Handler_Item;
+   --  Comment needed ???
+
+   --  Case (1)
+
+   type Dynamic_Interrupt_Protection is new
+     Tasking.Protected_Objects.Entries.Protection_Entries with null record;
+
+   --  ??? Finalize is not overloaded since we currently have no
+   --  way to detach the handlers during library level finalization.
+
+   function Has_Interrupt_Or_Attach_Handler
+     (Object : access Dynamic_Interrupt_Protection) return Boolean;
+   --  Returns True
+
+   --  Case (2)
+
+   type Static_Interrupt_Protection
+     (Num_Entries        : Tasking.Protected_Objects.Protected_Entry_Index;
+      Num_Attach_Handler : Static_Handler_Index)
+   is new
+     Tasking.Protected_Objects.Entries.Protection_Entries (Num_Entries) with
+     record
+       Previous_Handlers : Previous_Handler_Array (1 .. Num_Attach_Handler);
+     end record;
+
+   function Has_Interrupt_Or_Attach_Handler
+     (Object : access Static_Interrupt_Protection) return Boolean;
+   --  Returns True
+
+   procedure Finalize (Object : in out Static_Interrupt_Protection);
+   --  Restore previous handlers as required by C.3.1(12) then call
+   --  Finalize (Protection).
+
+   procedure Install_Handlers
+     (Object       : access Static_Interrupt_Protection;
+      New_Handlers : New_Handler_Array);
+   --  Store the old handlers in Object.Previous_Handlers and install
+   --  the new static handlers.
+
+   procedure Install_Restricted_Handlers (Handlers : New_Handler_Array);
+   --  Install the static Handlers for the given interrupts and do not store
+   --  previously installed handlers. This procedure is used when the Ravenscar
+   --  restrictions are in place since in that case there are only
+   --  library-level protected handlers that will be installed at
+   --  initialization and never be replaced.
+
+end System.Interrupts;