Add PR-ada-81070.diff

1 files changed, 1146 insertions, 0 deletions

diff --git a/tools/4.12/gcc/PR-ada-81070.diff b/tools/4.12/gcc/PR-ada-81070.diff
new file mode 100644
index 0000000..ffe1f95
--- /dev/null
+++ b/tools/4.12/gcc/PR-ada-81070.diff
@@ -0,0 +1,1146 @@
+From e40b2ea3a9420339332108b36c8ad471c832de20 Mon Sep 17 00:00:00 2001
+From: ebotcazou <ebotcazou@138bc75d-0d04-0410-961f-82ee72b054a4>
+Date: Mon, 12 Jun 2017 10:49:17 +0000
+Subject: [PATCH] 	PR ada/81070 	* s-interr-hwint.adb: Reinstate. 
+ * gcc-interface/Makefile.in (RTEMS): Use it again.
+
+git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-7-branch@249116 138bc75d-0d04-0410-961f-82ee72b054a4
+---
+ gcc/ada/ChangeLog                 |    6 +
+ gcc/ada/gcc-interface/Makefile.in |    2 +-
+ gcc/ada/s-interr-hwint.adb        | 1110 +++++++++++++++++++++++++++++++++++++
+ 3 files changed, 1117 insertions(+), 1 deletion(-)
+ create mode 100644 gcc/ada/s-interr-hwint.adb
+
+diff --git a/gcc/ada/gcc-interface/Makefile.in b/gcc/ada/gcc-interface/Makefile.in
+index 2dff5ab36e6..95221cdbe73 100644
+--- a/gcc/ada/gcc-interface/Makefile.in
++++ b/gcc/ada/gcc-interface/Makefile.in
+@@ -1736,7 +1736,7 @@ ifeq ($(strip $(filter-out rtems%,$(target_os))),)
+   s-taspri.ads<s-taspri-posix.ads \
+   s-tpopsp.adb<s-tpopsp-tls.adb \
+   s-stchop.adb<s-stchop-rtems.adb \
+-  s-interr.adb<s-interr-vxworks.adb
++  s-interr.adb<s-interr-hwint.adb
+ endif
+ 
+ # PikeOS
+diff --git a/gcc/ada/s-interr-hwint.adb b/gcc/ada/s-interr-hwint.adb
+new file mode 100644
+index 00000000000..8e2950f30fb
+--- /dev/null
++++ b/gcc/ada/s-interr-hwint.adb
+@@ -0,0 +1,1110 @@
++------------------------------------------------------------------------------
++--                                                                          --
++--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
++--                                                                          --
++--                     S Y S T E M . I N T E R R U P T S                    --
++--                                                                          --
++--                                  B o d y                                 --
++--                                                                          --
++--         Copyright (C) 1992-2014, 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.     --
++--                                                                          --
++------------------------------------------------------------------------------
++
++--  Invariants:
++
++--  All user-handlable signals are masked at all times in all tasks/threads
++--  except possibly for the Interrupt_Manager task.
++
++--  When a user task wants to have the effect of masking/unmasking an signal,
++--  it must call Block_Interrupt/Unblock_Interrupt, which will have the effect
++--  of unmasking/masking the signal in the Interrupt_Manager task. These
++--  comments do not apply to vectored hardware interrupts, which may be masked
++--  or unmasked using routined interfaced to the relevant embedded RTOS system
++--  calls.
++
++--  Once we associate a Signal_Server_Task with an signal, the task never goes
++--  away, and we never remove the association. On the other hand, it is more
++--  convenient to terminate an associated Interrupt_Server_Task for a vectored
++--  hardware interrupt (since we use a binary semaphore for synchronization
++--  with the umbrella handler).
++
++--  There is no more than one signal per Signal_Server_Task and no more than
++--  one Signal_Server_Task per signal. The same relation holds for hardware
++--  interrupts and Interrupt_Server_Task's at any given time. That is, only
++--  one non-terminated Interrupt_Server_Task exists for a give interrupt at
++--  any time.
++
++--  Within this package, the lock L is used to protect the various status
++--  tables. If there is a Server_Task associated with a signal or interrupt,
++--  we use the per-task lock of the Server_Task instead so that we protect the
++--  status between Interrupt_Manager and Server_Task. Protection among service
++--  requests are ensured via user calls to the Interrupt_Manager entries.
++
++--  This is reasonably generic version of this package, supporting vectored
++--  hardware interrupts using non-RTOS specific adapter routines which should
++--  easily implemented on any RTOS capable of supporting GNAT.
++
++with Ada.Unchecked_Conversion;
++with Ada.Task_Identification;
++
++with Interfaces.C; use Interfaces.C;
++with System.OS_Interface; use System.OS_Interface;
++with System.Interrupt_Management;
++with System.Task_Primitives.Operations;
++with System.Storage_Elements;
++with System.Tasking.Utilities;
++
++with System.Tasking.Rendezvous;
++pragma Elaborate_All (System.Tasking.Rendezvous);
++
++package body System.Interrupts is
++
++   use Tasking;
++
++   package POP renames System.Task_Primitives.Operations;
++
++   function To_Ada is new Ada.Unchecked_Conversion
++     (System.Tasking.Task_Id, Ada.Task_Identification.Task_Id);
++
++   function To_System is new Ada.Unchecked_Conversion
++     (Ada.Task_Identification.Task_Id, Task_Id);
++
++   -----------------
++   -- Local Tasks --
++   -----------------
++
++   --  WARNING: System.Tasking.Stages performs calls to this task with low-
++   --  level constructs. Do not change this spec without synchronizing it.
++
++   task Interrupt_Manager is
++      entry Detach_Interrupt_Entries (T : Task_Id);
++
++      entry Attach_Handler
++        (New_Handler : Parameterless_Handler;
++         Interrupt   : Interrupt_ID;
++         Static      : Boolean;
++         Restoration : Boolean := False);
++
++      entry Exchange_Handler
++        (Old_Handler : out Parameterless_Handler;
++         New_Handler : Parameterless_Handler;
++         Interrupt   : Interrupt_ID;
++         Static      : Boolean);
++
++      entry Detach_Handler
++        (Interrupt : Interrupt_ID;
++         Static    : Boolean);
++
++      entry Bind_Interrupt_To_Entry
++        (T         : Task_Id;
++         E         : Task_Entry_Index;
++         Interrupt : Interrupt_ID);
++
++      pragma Interrupt_Priority (System.Interrupt_Priority'First);
++   end Interrupt_Manager;
++
++   task type Interrupt_Server_Task
++     (Interrupt : Interrupt_ID;
++      Int_Sema  : Binary_Semaphore_Id)
++   is
++      --  Server task for vectored hardware interrupt handling
++
++      pragma Interrupt_Priority (System.Interrupt_Priority'First + 2);
++   end Interrupt_Server_Task;
++
++   type Interrupt_Task_Access is access Interrupt_Server_Task;
++
++   -------------------------------
++   -- Local Types and Variables --
++   -------------------------------
++
++   type Entry_Assoc is record
++      T : Task_Id;
++      E : Task_Entry_Index;
++   end record;
++
++   type Handler_Assoc is record
++      H      : Parameterless_Handler;
++      Static : Boolean;   --  Indicates static binding;
++   end record;
++
++   User_Handler : array (Interrupt_ID) of Handler_Assoc :=
++     (others => (null, Static => False));
++   pragma Volatile_Components (User_Handler);
++   --  Holds the protected procedure handler (if any) and its Static
++   --  information for each interrupt or signal. A handler is static iff it
++   --  is specified through the pragma Attach_Handler.
++
++   User_Entry : array (Interrupt_ID) of Entry_Assoc :=
++                  (others => (T => Null_Task, E => Null_Task_Entry));
++   pragma Volatile_Components (User_Entry);
++   --  Holds the task and entry index (if any) for each interrupt / signal
++
++   --  Type and Head, Tail of the list containing Registered Interrupt
++   --  Handlers. These definitions are used to register the handlers
++   --  specified by the pragma Interrupt_Handler.
++
++   type Registered_Handler;
++   type R_Link is access all Registered_Handler;
++
++   type Registered_Handler is record
++      H    : System.Address := System.Null_Address;
++      Next : R_Link := null;
++   end record;
++
++   Registered_Handler_Head : R_Link := null;
++   Registered_Handler_Tail : R_Link := null;
++
++   Server_ID : array (Interrupt_ID) of System.Tasking.Task_Id :=
++                 (others => System.Tasking.Null_Task);
++   pragma Atomic_Components (Server_ID);
++   --  Holds the Task_Id of the Server_Task for each interrupt / signal.
++   --  Task_Id is needed to accomplish locking per interrupt base. Also
++   --  is needed to determine whether to create a new Server_Task.
++
++   Semaphore_ID_Map : array
++     (Interrupt_ID range 0 .. System.OS_Interface.Max_HW_Interrupt) of
++        Binary_Semaphore_Id := (others => 0);
++   --  Array of binary semaphores associated with vectored interrupts. Note
++   --  that the last bound should be Max_HW_Interrupt, but this will raise
++   --  Storage_Error if Num_HW_Interrupts is null so use extra 4 bytes instead.
++
++   Interrupt_Access_Hold : Interrupt_Task_Access;
++   --  Variable for allocating an Interrupt_Server_Task
++
++   Handler_Installed : array (HW_Interrupt) of Boolean := (others => False);
++   --  True if Notify_Interrupt was connected to the interrupt. Handlers can
++   --  be connected but disconnection is not possible on VxWorks. Therefore
++   --  we ensure Notify_Installed is connected at most once.
++
++   -----------------------
++   -- Local Subprograms --
++   -----------------------
++
++   procedure Check_Reserved_Interrupt (Interrupt : Interrupt_ID);
++   --  Check if Id is a reserved interrupt, and if so raise Program_Error
++   --  with an appropriate message, otherwise return.
++
++   procedure Finalize_Interrupt_Servers;
++   --  Unbind the handlers for hardware interrupt server tasks at program
++   --  termination.
++
++   function Is_Registered (Handler : Parameterless_Handler) return Boolean;
++   --  See if Handler has been "pragma"ed using Interrupt_Handler.
++   --  Always consider a null handler as registered.
++
++   procedure Notify_Interrupt (Param : System.Address);
++   pragma Convention (C, Notify_Interrupt);
++   --  Umbrella handler for vectored interrupts (not signals)
++
++   procedure Install_Umbrella_Handler
++     (Interrupt : HW_Interrupt;
++      Handler   : System.OS_Interface.Interrupt_Handler);
++   --  Install the runtime umbrella handler for a vectored hardware
++   --  interrupt
++
++   procedure Unimplemented (Feature : String);
++   pragma No_Return (Unimplemented);
++   --  Used to mark a call to an unimplemented function. Raises Program_Error
++   --  with an appropriate message noting that Feature is unimplemented.
++
++   --------------------
++   -- Attach_Handler --
++   --------------------
++
++   --  Calling this procedure with New_Handler = null and Static = True
++   --  means we want to detach the current handler regardless of the previous
++   --  handler's binding status (i.e. do not care if it is a dynamic or static
++   --  handler).
++
++   --  This option is needed so that during the finalization of a PO, we can
++   --  detach handlers attached through pragma Attach_Handler.
++
++   procedure Attach_Handler
++     (New_Handler : Parameterless_Handler;
++      Interrupt   : Interrupt_ID;
++      Static      : Boolean := False) is
++   begin
++      Check_Reserved_Interrupt (Interrupt);
++      Interrupt_Manager.Attach_Handler (New_Handler, Interrupt, Static);
++   end Attach_Handler;
++
++   -----------------------------
++   -- Bind_Interrupt_To_Entry --
++   -----------------------------
++
++   --  This procedure raises a Program_Error if it tries to
++   --  bind an interrupt to which an Entry or a Procedure is
++   --  already bound.
++
++   procedure Bind_Interrupt_To_Entry
++     (T       : Task_Id;
++      E       : Task_Entry_Index;
++      Int_Ref : System.Address)
++   is
++      Interrupt : constant Interrupt_ID :=
++                    Interrupt_ID (Storage_Elements.To_Integer (Int_Ref));
++   begin
++      Check_Reserved_Interrupt (Interrupt);
++      Interrupt_Manager.Bind_Interrupt_To_Entry (T, E, Interrupt);
++   end Bind_Interrupt_To_Entry;
++
++   ---------------------
++   -- Block_Interrupt --
++   ---------------------
++
++   procedure Block_Interrupt (Interrupt : Interrupt_ID) is
++   begin
++      Unimplemented ("Block_Interrupt");
++   end Block_Interrupt;
++
++   ------------------------------
++   -- Check_Reserved_Interrupt --
++   ------------------------------
++
++   procedure Check_Reserved_Interrupt (Interrupt : Interrupt_ID) is
++   begin
++      if Is_Reserved (Interrupt) then
++         raise Program_Error with
++           "interrupt" & Interrupt_ID'Image (Interrupt) & " is reserved";
++      else
++         return;
++      end if;
++   end Check_Reserved_Interrupt;
++
++   ---------------------
++   -- Current_Handler --
++   ---------------------
++
++   function Current_Handler
++     (Interrupt : Interrupt_ID) return Parameterless_Handler
++   is
++   begin
++      Check_Reserved_Interrupt (Interrupt);
++
++      --  ??? Since Parameterless_Handler is not Atomic, the current
++      --  implementation is wrong. We need a new service in Interrupt_Manager
++      --  to ensure atomicity.
++
++      return User_Handler (Interrupt).H;
++   end Current_Handler;
++
++   --------------------
++   -- Detach_Handler --
++   --------------------
++
++   --  Calling this procedure with Static = True means we want to Detach the
++   --  current handler regardless of the previous handler's binding status
++   --  (i.e. do not care if it is a dynamic or static handler).
++
++   --  This option is needed so that during the finalization of a PO, we can
++   --  detach handlers attached through pragma Attach_Handler.
++
++   procedure Detach_Handler
++     (Interrupt : Interrupt_ID;
++      Static    : Boolean := False)
++   is
++   begin
++      Check_Reserved_Interrupt (Interrupt);
++      Interrupt_Manager.Detach_Handler (Interrupt, Static);
++   end Detach_Handler;
++
++   ------------------------------
++   -- Detach_Interrupt_Entries --
++   ------------------------------
++
++   procedure Detach_Interrupt_Entries (T : Task_Id) is
++   begin
++      Interrupt_Manager.Detach_Interrupt_Entries (T);
++   end Detach_Interrupt_Entries;
++
++   ----------------------
++   -- Exchange_Handler --
++   ----------------------
++
++   --  Calling this procedure with New_Handler = null and Static = True
++   --  means we want to detach the current handler regardless of the previous
++   --  handler's binding status (i.e. we do not care if it is a dynamic or
++   --  static handler).
++
++   --  This option is needed so that during the finalization of a PO, we can
++   --  detach handlers attached through pragma Attach_Handler.
++
++   procedure Exchange_Handler
++     (Old_Handler : out Parameterless_Handler;
++      New_Handler : Parameterless_Handler;
++      Interrupt   : Interrupt_ID;
++      Static      : Boolean := False)
++   is
++   begin
++      Check_Reserved_Interrupt (Interrupt);
++      Interrupt_Manager.Exchange_Handler
++        (Old_Handler, New_Handler, Interrupt, Static);
++   end Exchange_Handler;
++
++   --------------
++   -- Finalize --
++   --------------
++
++   procedure Finalize (Object : in out Static_Interrupt_Protection) is
++   begin
++      --  ??? loop to be executed only when we're not doing library level
++      --  finalization, since in this case all interrupt / signal tasks are
++      --  gone.
++
++      if not Interrupt_Manager'Terminated then
++         for N in reverse Object.Previous_Handlers'Range loop
++            Interrupt_Manager.Attach_Handler
++              (New_Handler => Object.Previous_Handlers (N).Handler,
++               Interrupt   => Object.Previous_Handlers (N).Interrupt,
++               Static      => Object.Previous_Handlers (N).Static,
++               Restoration => True);
++         end loop;
++      end if;
++
++      Tasking.Protected_Objects.Entries.Finalize
++        (Tasking.Protected_Objects.Entries.Protection_Entries (Object));
++   end Finalize;
++
++   --------------------------------
++   -- Finalize_Interrupt_Servers --
++   --------------------------------
++
++   --  Restore default handlers for interrupt servers
++
++   --  This is called by the Interrupt_Manager task when it receives the abort
++   --  signal during program finalization.
++
++   procedure Finalize_Interrupt_Servers is
++      HW_Interrupts : constant Boolean := HW_Interrupt'Last >= 0;
++   begin
++      if HW_Interrupts then
++         for Int in HW_Interrupt loop
++            if Server_ID (Interrupt_ID (Int)) /= null
++              and then
++                not Ada.Task_Identification.Is_Terminated
++                 (To_Ada (Server_ID (Interrupt_ID (Int))))
++            then
++               Interrupt_Manager.Attach_Handler
++                 (New_Handler => null,
++                  Interrupt   => Interrupt_ID (Int),
++                  Static      => True,
++                  Restoration => True);
++            end if;
++         end loop;
++      end if;
++   end Finalize_Interrupt_Servers;
++
++   -------------------------------------
++   -- Has_Interrupt_Or_Attach_Handler --
++   -------------------------------------
++
++   function Has_Interrupt_Or_Attach_Handler
++     (Object : access Dynamic_Interrupt_Protection)
++      return   Boolean
++   is
++      pragma Unreferenced (Object);
++   begin
++      return True;
++   end Has_Interrupt_Or_Attach_Handler;
++
++   function Has_Interrupt_Or_Attach_Handler
++     (Object : access Static_Interrupt_Protection)
++      return   Boolean
++   is
++      pragma Unreferenced (Object);
++   begin
++      return True;
++   end Has_Interrupt_Or_Attach_Handler;
++
++   ----------------------
++   -- Ignore_Interrupt --
++   ----------------------
++
++   procedure Ignore_Interrupt (Interrupt : Interrupt_ID) is
++   begin
++      Unimplemented ("Ignore_Interrupt");
++   end Ignore_Interrupt;
++
++   ----------------------
++   -- Install_Handlers --
++   ----------------------
++
++   procedure Install_Handlers
++     (Object       : access Static_Interrupt_Protection;
++      New_Handlers : New_Handler_Array)
++   is
++   begin
++      for N in New_Handlers'Range loop
++
++         --  We need a lock around this ???
++
++         Object.Previous_Handlers (N).Interrupt := New_Handlers (N).Interrupt;
++         Object.Previous_Handlers (N).Static    := User_Handler
++           (New_Handlers (N).Interrupt).Static;
++
++         --  We call Exchange_Handler and not directly Interrupt_Manager.
++         --  Exchange_Handler so we get the Is_Reserved check.
++
++         Exchange_Handler
++           (Old_Handler => Object.Previous_Handlers (N).Handler,
++            New_Handler => New_Handlers (N).Handler,
++            Interrupt   => New_Handlers (N).Interrupt,
++            Static      => True);
++      end loop;
++   end Install_Handlers;
++
++   ---------------------------------
++   -- Install_Restricted_Handlers --
++   ---------------------------------
++
++   procedure Install_Restricted_Handlers
++      (Prio     : Any_Priority;
++       Handlers : New_Handler_Array)
++   is
++      pragma Unreferenced (Prio);
++   begin
++      for N in Handlers'Range loop
++         Attach_Handler (Handlers (N).Handler, Handlers (N).Interrupt, True);
++      end loop;
++   end Install_Restricted_Handlers;
++
++   ------------------------------
++   -- Install_Umbrella_Handler --
++   ------------------------------
++
++   procedure Install_Umbrella_Handler
++     (Interrupt : HW_Interrupt;
++      Handler   : System.OS_Interface.Interrupt_Handler)
++   is
++      Vec : constant Interrupt_Vector :=
++              Interrupt_Number_To_Vector (int (Interrupt));
++
++      Status : int;
++
++   begin
++      --  Only install umbrella handler when no Ada handler has already been
++      --  installed. Note that the interrupt number is passed as a parameter
++      --  when an interrupt occurs, so the umbrella handler has a different
++      --  wrapper generated by intConnect for each interrupt number.
++
++      if not Handler_Installed (Interrupt) then
++         Status :=
++            Interrupt_Connect (Vec, Handler, System.Address (Interrupt));
++         pragma Assert (Status = 0);
++
++         Handler_Installed (Interrupt) := True;
++      end if;
++   end Install_Umbrella_Handler;
++
++   ----------------
++   -- Is_Blocked --
++   ----------------
++
++   function Is_Blocked (Interrupt : Interrupt_ID) return Boolean is
++   begin
++      Unimplemented ("Is_Blocked");
++      return False;
++   end Is_Blocked;
++
++   -----------------------
++   -- Is_Entry_Attached --
++   -----------------------
++
++   function Is_Entry_Attached (Interrupt : Interrupt_ID) return Boolean is
++   begin
++      Check_Reserved_Interrupt (Interrupt);
++      return User_Entry (Interrupt).T /= Null_Task;
++   end Is_Entry_Attached;
++
++   -------------------------
++   -- Is_Handler_Attached --
++   -------------------------
++
++   function Is_Handler_Attached (Interrupt : Interrupt_ID) return Boolean is
++   begin
++      Check_Reserved_Interrupt (Interrupt);
++      return User_Handler (Interrupt).H /= null;
++   end Is_Handler_Attached;
++
++   ----------------
++   -- Is_Ignored --
++   ----------------
++
++   function Is_Ignored (Interrupt : Interrupt_ID) return Boolean is
++   begin
++      Unimplemented ("Is_Ignored");
++      return False;
++   end Is_Ignored;
++
++   -------------------
++   -- Is_Registered --
++   -------------------
++
++   function Is_Registered (Handler : Parameterless_Handler) return Boolean is
++      type Fat_Ptr is record
++         Object_Addr  : System.Address;
++         Handler_Addr : System.Address;
++      end record;
++
++      function To_Fat_Ptr is new Ada.Unchecked_Conversion
++        (Parameterless_Handler, Fat_Ptr);
++
++      Ptr : R_Link;
++      Fat : Fat_Ptr;
++
++   begin
++      if Handler = null then
++         return True;
++      end if;
++
++      Fat := To_Fat_Ptr (Handler);
++
++      Ptr := Registered_Handler_Head;
++      while Ptr /= null loop
++         if Ptr.H = Fat.Handler_Addr then
++            return True;
++         end if;
++
++         Ptr := Ptr.Next;
++      end loop;
++
++      return False;
++   end Is_Registered;
++
++   -----------------
++   -- Is_Reserved --
++   -----------------
++
++   function Is_Reserved (Interrupt : Interrupt_ID) return Boolean is
++      use System.Interrupt_Management;
++   begin
++      return Reserve (System.Interrupt_Management.Interrupt_ID (Interrupt));
++   end Is_Reserved;
++
++   ----------------------
++   -- Notify_Interrupt --
++   ----------------------
++
++   --  Umbrella handler for vectored hardware interrupts (as opposed to signals
++   --  and exceptions). As opposed to the signal implementation, this handler
++   --  is installed in the vector table when the first Ada handler is attached
++   --  to the interrupt. However because VxWorks don't support disconnecting
++   --  handlers, this subprogram always test whether or not an Ada handler is
++   --  effectively attached.
++
++   --  Otherwise, the handler that existed prior to program startup is in the
++   --  vector table. This ensures that handlers installed by the BSP are active
++   --  unless explicitly replaced in the program text.
++
++   --  Each Interrupt_Server_Task has an associated binary semaphore on which
++   --  it pends once it's been started. This routine determines The appropriate
++   --  semaphore and issues a semGive call, waking the server task. When
++   --  a handler is unbound, System.Interrupts.Unbind_Handler issues a
++   --  Binary_Semaphore_Flush, and the server task deletes its semaphore
++   --  and terminates.
++
++   procedure Notify_Interrupt (Param : System.Address) is
++      Interrupt : constant Interrupt_ID := Interrupt_ID (Param);
++      Id        : constant Binary_Semaphore_Id := Semaphore_ID_Map (Interrupt);
++      Status    : int;
++   begin
++      if Id /= 0 then
++         Status := Binary_Semaphore_Release (Id);
++         pragma Assert (Status = 0);
++      end if;
++   end Notify_Interrupt;
++
++   ---------------
++   -- Reference --
++   ---------------
++
++   function Reference (Interrupt : Interrupt_ID) return System.Address is
++   begin
++      Check_Reserved_Interrupt (Interrupt);
++      return Storage_Elements.To_Address
++               (Storage_Elements.Integer_Address (Interrupt));
++   end Reference;
++
++   --------------------------------
++   -- Register_Interrupt_Handler --
++   --------------------------------
++
++   procedure Register_Interrupt_Handler (Handler_Addr : System.Address) is
++      New_Node_Ptr : R_Link;
++
++   begin
++      --  This routine registers a handler as usable for dynamic interrupt
++      --  handler association. Routines attaching and detaching handlers
++      --  dynamically should determine whether the handler is registered.
++      --  Program_Error should be raised if it is not registered.
++
++      --  Pragma Interrupt_Handler can only appear in a library level PO
++      --  definition and instantiation. Therefore, we do not need to implement
++      --  an unregister operation. Nor do we need to protect the queue
++      --  structure with a lock.
++
++      pragma Assert (Handler_Addr /= System.Null_Address);
++
++      New_Node_Ptr := new Registered_Handler;
++      New_Node_Ptr.H := Handler_Addr;
++
++      if Registered_Handler_Head = null then
++         Registered_Handler_Head := New_Node_Ptr;
++         Registered_Handler_Tail := New_Node_Ptr;
++      else
++         Registered_Handler_Tail.Next := New_Node_Ptr;
++         Registered_Handler_Tail := New_Node_Ptr;
++      end if;
++   end Register_Interrupt_Handler;
++
++   -----------------------
++   -- Unblock_Interrupt --
++   -----------------------
++
++   procedure Unblock_Interrupt (Interrupt : Interrupt_ID) is
++   begin
++      Unimplemented ("Unblock_Interrupt");
++   end Unblock_Interrupt;
++
++   ------------------
++   -- Unblocked_By --
++   ------------------
++
++   function Unblocked_By
++     (Interrupt : Interrupt_ID) return System.Tasking.Task_Id
++   is
++   begin
++      Unimplemented ("Unblocked_By");
++      return Null_Task;
++   end Unblocked_By;
++
++   ------------------------
++   -- Unignore_Interrupt --
++   ------------------------
++
++   procedure Unignore_Interrupt (Interrupt : Interrupt_ID) is
++   begin
++      Unimplemented ("Unignore_Interrupt");
++   end Unignore_Interrupt;
++
++   -------------------
++   -- Unimplemented --
++   -------------------
++
++   procedure Unimplemented (Feature : String) is
++   begin
++      raise Program_Error with Feature & " not implemented on VxWorks";
++   end Unimplemented;
++
++   -----------------------
++   -- Interrupt_Manager --
++   -----------------------
++
++   task body Interrupt_Manager is
++      --  By making this task independent of any master, when the process goes
++      --  away, the Interrupt_Manager will terminate gracefully.
++
++      Ignore : constant Boolean := System.Tasking.Utilities.Make_Independent;
++      pragma Unreferenced (Ignore);
++
++      --------------------
++      -- Local Routines --
++      --------------------
++
++      procedure Bind_Handler (Interrupt : Interrupt_ID);
++      --  This procedure does not do anything if a signal is blocked.
++      --  Otherwise, we have to interrupt Server_Task for status change
++      --  through a wakeup signal.
++
++      procedure Unbind_Handler (Interrupt : Interrupt_ID);
++      --  This procedure does not do anything if a signal is blocked.
++      --  Otherwise, we have to interrupt Server_Task for status change
++      --  through an abort signal.
++
++      procedure Unprotected_Exchange_Handler
++        (Old_Handler : out Parameterless_Handler;
++         New_Handler : Parameterless_Handler;
++         Interrupt   : Interrupt_ID;
++         Static      : Boolean;
++         Restoration : Boolean := False);
++
++      procedure Unprotected_Detach_Handler
++        (Interrupt : Interrupt_ID;
++         Static    : Boolean);
++
++      ------------------
++      -- Bind_Handler --
++      ------------------
++
++      procedure Bind_Handler (Interrupt : Interrupt_ID) is
++      begin
++         Install_Umbrella_Handler
++           (HW_Interrupt (Interrupt), Notify_Interrupt'Access);
++      end Bind_Handler;
++
++      --------------------
++      -- Unbind_Handler --
++      --------------------
++
++      procedure Unbind_Handler (Interrupt : Interrupt_ID) is
++         Status : int;
++
++      begin
++         --  Flush server task off semaphore, allowing it to terminate
++
++         Status := Binary_Semaphore_Flush (Semaphore_ID_Map (Interrupt));
++         pragma Assert (Status = 0);
++      end Unbind_Handler;
++
++      --------------------------------
++      -- Unprotected_Detach_Handler --
++      --------------------------------
++
++      procedure Unprotected_Detach_Handler
++        (Interrupt : Interrupt_ID;
++         Static    : Boolean)
++      is
++         Old_Handler : Parameterless_Handler;
++      begin
++         if User_Entry (Interrupt).T /= Null_Task then
++
++            --  If an interrupt entry is installed raise Program_Error
++            --  (propagate it to the caller).
++
++            raise Program_Error with
++              "an interrupt entry is already installed";
++         end if;
++
++         --  Note : Static = True will pass the following check. This is the
++         --  case when we want to detach a handler regardless of the static
++         --  status of the Current_Handler.
++
++         if not Static and then User_Handler (Interrupt).Static then
++
++            --  Trying to detach a static Interrupt Handler, raise
++            --  Program_Error.
++
++            raise Program_Error with
++              "trying to detach a static Interrupt Handler";
++         end if;
++
++         Old_Handler := User_Handler (Interrupt).H;
++
++         --  The new handler
++
++         User_Handler (Interrupt).H := null;
++         User_Handler (Interrupt).Static := False;
++
++         if Old_Handler /= null then
++            Unbind_Handler (Interrupt);
++         end if;
++      end Unprotected_Detach_Handler;
++
++      ----------------------------------
++      -- Unprotected_Exchange_Handler --
++      ----------------------------------
++
++      procedure Unprotected_Exchange_Handler
++        (Old_Handler : out Parameterless_Handler;
++         New_Handler : Parameterless_Handler;
++         Interrupt   : Interrupt_ID;
++         Static      : Boolean;
++         Restoration : Boolean := False)
++      is
++      begin
++         if User_Entry (Interrupt).T /= Null_Task then
++
++            --  If an interrupt entry is already installed, raise
++            --  Program_Error (propagate it to the caller).
++
++            raise Program_Error with "an interrupt is already installed";
++         end if;
++
++         --  Note : A null handler with Static = True will pass the following
++         --  check. This is the case when we want to detach a handler
++         --  regardless of the Static status of Current_Handler.
++
++         --  We don't check anything if Restoration is True, since we may be
++         --  detaching a static handler to restore a dynamic one.
++
++         if not Restoration and then not Static
++           and then (User_Handler (Interrupt).Static
++
++            --  Trying to overwrite a static Interrupt Handler with a dynamic
++            --  Handler
++
++            --  The new handler is not specified as an Interrupt Handler by a
++            --  pragma.
++
++           or else not Is_Registered (New_Handler))
++         then
++            raise Program_Error with
++               "trying to overwrite a static interrupt handler with a "
++               & "dynamic handler";
++         end if;
++
++         --  Save the old handler
++
++         Old_Handler := User_Handler (Interrupt).H;
++
++         --  The new handler
++
++         User_Handler (Interrupt).H := New_Handler;
++
++         if New_Handler = null then
++
++            --  The null handler means we are detaching the handler
++
++            User_Handler (Interrupt).Static := False;
++
++         else
++            User_Handler (Interrupt).Static := Static;
++         end if;
++
++         --  Invoke a corresponding Server_Task if not yet created. Place
++         --  Task_Id info in Server_ID array.
++
++         if New_Handler /= null
++           and then
++            (Server_ID (Interrupt) = Null_Task
++              or else
++                Ada.Task_Identification.Is_Terminated
++                  (To_Ada (Server_ID (Interrupt))))
++         then
++            Interrupt_Access_Hold :=
++              new Interrupt_Server_Task (Interrupt, Binary_Semaphore_Create);
++            Server_ID (Interrupt) :=
++              To_System (Interrupt_Access_Hold.all'Identity);
++         end if;
++
++         if (New_Handler = null) and then Old_Handler /= null then
++
++            --  Restore default handler
++
++            Unbind_Handler (Interrupt);
++
++         elsif Old_Handler = null then
++
++            --  Save default handler
++
++            Bind_Handler (Interrupt);
++         end if;
++      end Unprotected_Exchange_Handler;
++
++   --  Start of processing for Interrupt_Manager
++
++   begin
++      loop
++         --  A block is needed to absorb Program_Error exception
++
++         declare
++            Old_Handler : Parameterless_Handler;
++
++         begin
++            select
++               accept Attach_Handler
++                 (New_Handler : Parameterless_Handler;
++                  Interrupt   : Interrupt_ID;
++                  Static      : Boolean;
++                  Restoration : Boolean := False)
++               do
++                  Unprotected_Exchange_Handler
++                    (Old_Handler, New_Handler, Interrupt, Static, Restoration);
++               end Attach_Handler;
++
++            or
++               accept Exchange_Handler
++                 (Old_Handler : out Parameterless_Handler;
++                  New_Handler : Parameterless_Handler;
++                  Interrupt   : Interrupt_ID;
++                  Static      : Boolean)
++               do
++                  Unprotected_Exchange_Handler
++                    (Old_Handler, New_Handler, Interrupt, Static);
++               end Exchange_Handler;
++
++            or
++               accept Detach_Handler
++                  (Interrupt : Interrupt_ID;
++                   Static    : Boolean)
++               do
++                  Unprotected_Detach_Handler (Interrupt, Static);
++               end Detach_Handler;
++
++            or
++               accept Bind_Interrupt_To_Entry
++                 (T         : Task_Id;
++                  E         : Task_Entry_Index;
++                  Interrupt : Interrupt_ID)
++               do
++                  --  If there is a binding already (either a procedure or an
++                  --  entry), raise Program_Error (propagate it to the caller).
++
++                  if User_Handler (Interrupt).H /= null
++                    or else User_Entry (Interrupt).T /= Null_Task
++                  then
++                     raise Program_Error with
++                       "a binding for this interrupt is already present";
++                  end if;
++
++                  User_Entry (Interrupt) := Entry_Assoc'(T => T, E => E);
++
++                  --  Indicate the attachment of interrupt entry in the ATCB.
++                  --  This is needed so when an interrupt entry task terminates
++                  --  the binding can be cleaned. The call to unbinding must be
++                  --  make by the task before it terminates.
++
++                  T.Interrupt_Entry := True;
++
++                  --  Invoke a corresponding Server_Task if not yet created.
++                  --  Place Task_Id info in Server_ID array.
++
++                  if Server_ID (Interrupt) = Null_Task
++                    or else
++                      Ada.Task_Identification.Is_Terminated
++                        (To_Ada (Server_ID (Interrupt)))
++                  then
++                     Interrupt_Access_Hold := new Interrupt_Server_Task
++                       (Interrupt, Binary_Semaphore_Create);
++                     Server_ID (Interrupt) :=
++                       To_System (Interrupt_Access_Hold.all'Identity);
++                  end if;
++
++                  Bind_Handler (Interrupt);
++               end Bind_Interrupt_To_Entry;
++
++            or
++               accept Detach_Interrupt_Entries (T : Task_Id) do
++                  for Int in Interrupt_ID'Range loop
++                     if not Is_Reserved (Int) then
++                        if User_Entry (Int).T = T then
++                           User_Entry (Int) :=
++                             Entry_Assoc'
++                               (T => Null_Task, E => Null_Task_Entry);
++                           Unbind_Handler (Int);
++                        end if;
++                     end if;
++                  end loop;
++
++                  --  Indicate in ATCB that no interrupt entries are attached
++
++                  T.Interrupt_Entry := False;
++               end Detach_Interrupt_Entries;
++            end select;
++
++         exception
++            --  If there is a Program_Error we just want to propagate it to
++            --  the caller and do not want to stop this task.
++
++            when Program_Error =>
++               null;
++
++            when others =>
++               pragma Assert (False);
++               null;
++         end;
++      end loop;
++
++   exception
++      when Standard'Abort_Signal =>
++
++         --  Flush interrupt server semaphores, so they can terminate
++
++         Finalize_Interrupt_Servers;
++         raise;
++   end Interrupt_Manager;
++
++   ---------------------------
++   -- Interrupt_Server_Task --
++   ---------------------------
++
++   --  Server task for vectored hardware interrupt handling
++
++   task body Interrupt_Server_Task is
++      Ignore : constant Boolean := System.Tasking.Utilities.Make_Independent;
++
++      Self_Id         : constant Task_Id := Self;
++      Tmp_Handler     : Parameterless_Handler;
++      Tmp_ID          : Task_Id;
++      Tmp_Entry_Index : Task_Entry_Index;
++      Status          : int;
++
++   begin
++      Semaphore_ID_Map (Interrupt) := Int_Sema;
++
++      loop
++         --  Pend on semaphore that will be triggered by the umbrella handler
++         --  when the associated interrupt comes in.
++
++         Status := Binary_Semaphore_Obtain (Int_Sema);
++         pragma Assert (Status = 0);
++
++         if User_Handler (Interrupt).H /= null then
++
++            --  Protected procedure handler
++
++            Tmp_Handler := User_Handler (Interrupt).H;
++            Tmp_Handler.all;
++
++         elsif User_Entry (Interrupt).T /= Null_Task then
++
++            --  Interrupt entry handler
++
++            Tmp_ID := User_Entry (Interrupt).T;
++            Tmp_Entry_Index := User_Entry (Interrupt).E;
++            System.Tasking.Rendezvous.Call_Simple
++              (Tmp_ID, Tmp_Entry_Index, System.Null_Address);
++
++         else
++            --  Semaphore has been flushed by an unbind operation in the
++            --  Interrupt_Manager. Terminate the server task.
++
++            --  Wait for the Interrupt_Manager to complete its work
++
++            POP.Write_Lock (Self_Id);
++
++            --  Unassociate the interrupt handler
++
++            Semaphore_ID_Map (Interrupt) := 0;
++
++            --  Delete the associated semaphore
++
++            Status := Binary_Semaphore_Delete (Int_Sema);
++
++            pragma Assert (Status = 0);
++
++            --  Set status for the Interrupt_Manager
++
++            Server_ID (Interrupt) := Null_Task;
++            POP.Unlock (Self_Id);
++
++            exit;
++         end if;
++      end loop;
++   end Interrupt_Server_Task;
++
++begin
++   --  Get Interrupt_Manager's ID so that Abort_Interrupt can be sent
++
++   Interrupt_Manager_ID := To_System (Interrupt_Manager'Identity);
++end System.Interrupts;
+-- 
+2.12.3
+