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[/] [openrisc/] [tags/] [gnu-src/] [gcc-4.5.1/] [gcc-4.5.1-or32-1.0rc1/] [gcc/] [ada/] [s-intman-vxworks.adb] - Rev 338
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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 _ 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;