154 lines
6.1 KiB
Ada
154 lines
6.1 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
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-- --
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-- 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 --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
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-- --
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-- GNARL is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNARL was developed by the GNARL team at Florida State University. --
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-- Extensive contributions were provided by Ada Core Technologies, Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This is the VxWorks version of this package
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-- Make a careful study of all signals available under the OS, to see which
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-- need to be reserved, kept always unmasked, or kept always unmasked. Be on
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-- the lookout for special signals that may be used by the thread library.
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package body System.Interrupt_Management is
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use System.OS_Interface;
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use type Interfaces.C.int;
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type Signal_List is array (Signal_ID range <>) of Signal_ID;
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Exception_Signals : constant Signal_List (1 .. 4) :=
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(SIGFPE, SIGILL, SIGSEGV, SIGBUS);
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Exception_Action : aliased struct_sigaction;
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-- Keep this variable global so that it is initialized only once
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procedure Notify_Exception
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(signo : Signal;
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siginfo : System.Address;
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sigcontext : System.Address);
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pragma Import (C, Notify_Exception, "__gnat_error_handler");
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-- Map signal to Ada exception and raise it. Different versions
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-- of VxWorks need different mappings.
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-----------------------
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-- Local Subprograms --
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-----------------------
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function State (Int : Interrupt_ID) return Character;
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pragma Import (C, State, "__gnat_get_interrupt_state");
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-- Get interrupt state. Defined in init.c The input argument is the
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-- interrupt number, and the result is one of the following:
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Runtime : constant Character := 'r';
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Default : constant Character := 's';
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-- 'n' this interrupt not set by any Interrupt_State pragma
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-- 'u' Interrupt_State pragma set state to User
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-- 'r' Interrupt_State pragma set state to Runtime
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-- 's' Interrupt_State pragma set state to System (use "default"
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-- system handler)
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---------------------------
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-- Initialize_Interrupts --
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---------------------------
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-- Since there is no signal inheritance between VxWorks tasks, we need
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-- to initialize signal handling in each task.
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procedure Initialize_Interrupts is
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Result : int;
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old_act : aliased struct_sigaction;
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begin
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for J in Exception_Signals'Range loop
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Result :=
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sigaction
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(Signal (Exception_Signals (J)), Exception_Action'Access,
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old_act'Unchecked_Access);
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pragma Assert (Result = 0);
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end loop;
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end Initialize_Interrupts;
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----------------
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-- Initialize --
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----------------
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Initialized : Boolean := False;
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-- Set to True once Initialize is called, further calls have no effect
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procedure Initialize is
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mask : aliased sigset_t;
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Result : int;
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begin
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if Initialized then
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return;
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end if;
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Initialized := True;
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-- Change this if you want to use another signal for task abort.
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-- SIGTERM might be a good one.
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Abort_Task_Interrupt := SIGABRT;
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Exception_Action.sa_handler := Notify_Exception'Address;
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Exception_Action.sa_flags := SA_ONSTACK + SA_SIGINFO;
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Result := sigemptyset (mask'Access);
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pragma Assert (Result = 0);
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for J in Exception_Signals'Range loop
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Result := sigaddset (mask'Access, Signal (Exception_Signals (J)));
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pragma Assert (Result = 0);
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end loop;
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Exception_Action.sa_mask := mask;
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-- Initialize hardware interrupt handling
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pragma Assert (Reserve = (Interrupt_ID'Range => False));
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-- Check all interrupts for state that requires keeping them reserved
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for J in Interrupt_ID'Range loop
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if State (J) = Default or else State (J) = Runtime then
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Reserve (J) := True;
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end if;
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end loop;
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-- Add exception signals to the set of unmasked signals
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for J in Exception_Signals'Range loop
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Keep_Unmasked (Exception_Signals (J)) := True;
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end loop;
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-- The abort signal must also be unmasked
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Keep_Unmasked (Abort_Task_Interrupt) := True;
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end Initialize;
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end System.Interrupt_Management;
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