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Diffstat (limited to 'gcc/ada/s-intman-vxworks.adb')
| -rw-r--r-- | gcc/ada/s-intman-vxworks.adb | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/gcc/ada/s-intman-vxworks.adb b/gcc/ada/s-intman-vxworks.adb new file mode 100644 index 000000000..dacc418f0 --- /dev/null +++ b/gcc/ada/s-intman-vxworks.adb @@ -0,0 +1,153 @@ +------------------------------------------------------------------------------ +-- -- +-- 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; |