------------------------------------------------------------------------------ -- -- -- GNU ADA 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) 1992-2002 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, 59 Temple Place - Suite 330, Boston, -- -- MA 02111-1307, 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. -- It is likely to need tailoring to fit each operating system -- and machine architecture. -- PLEASE DO NOT add any dependences on other packages. -- This package is designed to work with or without tasking support. -- See the other warnings in the package specification before making -- any modifications to this file. -- 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. with Interfaces.C; with System.OS_Interface; -- used for various Constants, Signal and types package body System.Interrupt_Management is use System.OS_Interface; use type Interfaces.C.int; type Interrupt_List is array (Interrupt_ID range <>) of Interrupt_ID; Exception_Interrupts : constant Interrupt_List (1 .. 4) := (SIGFPE, SIGILL, SIGSEGV, SIGBUS); -- Keep these variables global so that they are initialized only once. Exception_Action : aliased struct_sigaction; ---------------------- -- Notify_Exception -- ---------------------- procedure Notify_Exception (signo : Signal); -- Identify the Ada exception to be raised using -- the information when the system received a synchronous signal. procedure Notify_Exception (signo : Signal) is Mask : aliased sigset_t; Result : int; My_Id : t_id; begin Result := pthread_sigmask (SIG_SETMASK, null, Mask'Unchecked_Access); Result := sigdelset (Mask'Access, signo); Result := pthread_sigmask (SIG_SETMASK, Mask'Unchecked_Access, null); -- VxWorks will suspend the task when it gets a hardware -- exception. We take the liberty of resuming the task -- for the application. My_Id := taskIdSelf; if taskIsSuspended (My_Id) /= 0 then Result := taskResume (My_Id); end if; case signo is when SIGFPE => raise Constraint_Error; when SIGILL => raise Constraint_Error; when SIGSEGV => raise Program_Error; when SIGBUS => raise Program_Error; when others => -- Unexpected signal raise Program_Error; end case; 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_Interrupts'Range loop Result := sigaction (Signal (Exception_Interrupts (J)), Exception_Action'Access, old_act'Unchecked_Access); pragma Assert (Result = 0); end loop; end Initialize_Interrupts; begin declare mask : aliased sigset_t; Result : int; begin Abort_Task_Interrupt := SIGABRT; -- Change this if you want to use another signal for task abort. -- SIGTERM might be a good one. 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_Interrupts'Range loop Result := sigaddset (mask'Access, Signal (Exception_Interrupts (J))); pragma Assert (Result = 0); end loop; Exception_Action.sa_mask := mask; end; end System.Interrupt_Management;