------------------------------------------------------------------------------ -- -- -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- -- -- -- S Y S T E M . I N T E R R U P T _ M A N A G E M E N T -- -- -- -- B o d y -- -- -- -- Copyright (C) 1992-2006 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 VxWorks version of this package. -- Make a careful study of all signals available under the OS, -- to see which need to be reserved, kept always unmasked, -- or kept always unmasked. -- Be on the lookout for special signals that -- may be used by the thread library. package body System.Interrupt_Management is use System.OS_Interface; use type Interfaces.C.int; type Signal_List is array (Signal_ID range <>) of Signal_ID; Exception_Signals : constant Signal_List (1 .. 4) := (SIGFPE, SIGILL, SIGSEGV, SIGBUS); Exception_Action : aliased struct_sigaction; -- Keep this variable global so that it is initialized only once procedure Map_And_Raise_Exception (signo : Signal); pragma Import (C, Map_And_Raise_Exception, "__gnat_map_signal"); -- Map signal to Ada exception and raise it. Different versions -- of VxWorks need different mappings. ----------------------- -- Local Subprograms -- ----------------------- function State (Int : Interrupt_ID) return Character; pragma Import (C, State, "__gnat_get_interrupt_state"); -- Get interrupt state. Defined in init.c -- The input argument is the interrupt number, -- and the result is one of the following: Runtime : constant Character := 'r'; Default : constant Character := 's'; -- 'n' this interrupt not set by any Interrupt_State pragma -- 'u' Interrupt_State pragma set state to User -- 'r' Interrupt_State pragma set state to Runtime -- 's' Interrupt_State pragma set state to System (use "default" -- system handler) procedure Notify_Exception (signo : Signal); -- Identify the Ada exception to be raised using -- the information when the system received a synchronous signal. ---------------------- -- Notify_Exception -- ---------------------- procedure Notify_Exception (signo : Signal) is Mask : aliased sigset_t; Result : int; pragma Unreferenced (Result); begin Result := pthread_sigmask (SIG_SETMASK, null, Mask'Unchecked_Access); Result := sigdelset (Mask'Access, signo); Result := pthread_sigmask (SIG_SETMASK, Mask'Unchecked_Access, null); Map_And_Raise_Exception (signo); end Notify_Exception; --------------------------- -- Initialize_Interrupts -- --------------------------- -- Since there is no signal inheritance between VxWorks tasks, we need -- to initialize signal handling in each task. procedure Initialize_Interrupts is Result : int; old_act : aliased struct_sigaction; begin for J in Exception_Signals'Range loop Result := sigaction (Signal (Exception_Signals (J)), Exception_Action'Access, old_act'Unchecked_Access); pragma Assert (Result = 0); end loop; end Initialize_Interrupts; ---------------- -- Initialize -- ---------------- Initialized : Boolean := False; procedure Initialize is mask : aliased sigset_t; Result : int; begin if Initialized then return; end if; Initialized := True; -- Change this if you want to use another signal for task abort. -- SIGTERM might be a good one. Abort_Task_Signal := SIGABRT; Exception_Action.sa_handler := Notify_Exception'Address; Exception_Action.sa_flags := SA_ONSTACK; Result := sigemptyset (mask'Access); pragma Assert (Result = 0); for J in Exception_Signals'Range loop Result := sigaddset (mask'Access, Signal (Exception_Signals (J))); pragma Assert (Result = 0); end loop; Exception_Action.sa_mask := mask; -- Initialize hardware interrupt handling pragma Assert (Reserve = (Interrupt_ID'Range => False)); -- Check all interrupts for state that requires keeping them reserved for J in Interrupt_ID'Range loop if State (J) = Default or else State (J) = Runtime then Reserve (J) := True; end if; end loop; -- Add exception signals to the set of unmasked signals for J in Exception_Signals'Range loop Keep_Unmasked (Exception_Signals (J)) := True; end loop; -- The abort signal must also be unmasked Keep_Unmasked (Abort_Task_Signal) := True; end Initialize; end System.Interrupt_Management;