| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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) 1992-2009, 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 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 Notify_Exception |
| (signo : Signal; |
| siginfo : System.Address; |
| sigcontext : System.Address); |
| pragma Import (C, Notify_Exception, "__gnat_error_handler"); |
| -- 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) |
| |
| --------------------------- |
| -- 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; |
| -- Set to True once Initialize is called, further calls have no effect |
| |
| 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_Interrupt := SIGABRT; |
| |
| Exception_Action.sa_handler := Notify_Exception'Address; |
| Exception_Action.sa_flags := SA_ONSTACK + SA_SIGINFO; |
| 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_Interrupt) := True; |
| end Initialize; |
| |
| end System.Interrupt_Management; |