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Diffstat (limited to 'gcc-4.2.1/gcc/ada/s-intman-vxworks.adb')
-rw-r--r-- | gcc-4.2.1/gcc/ada/s-intman-vxworks.adb | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/gcc-4.2.1/gcc/ada/s-intman-vxworks.adb b/gcc-4.2.1/gcc/ada/s-intman-vxworks.adb new file mode 100644 index 000000000..2d265ba76 --- /dev/null +++ b/gcc-4.2.1/gcc/ada/s-intman-vxworks.adb @@ -0,0 +1,175 @@ +------------------------------------------------------------------------------ +-- -- +-- 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; |