195 lines
7.5 KiB
Ada
195 lines
7.5 KiB
Ada
------------------------------------------------------------------------------
|
|
-- --
|
|
-- GNU ADA 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) 1992-2004 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, 59 Temple Place - Suite 330, Boston, --
|
|
-- MA 02111-1307, 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.
|
|
|
|
-- It is likely to need tailoring to fit each operating system
|
|
-- and machine architecture.
|
|
|
|
-- PLEASE DO NOT add any dependences on other packages.
|
|
-- This package is designed to work with or without tasking support.
|
|
|
|
-- See the other warnings in the package specification before making
|
|
-- any modifications to this file.
|
|
|
|
-- 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.
|
|
|
|
with Interfaces.C;
|
|
|
|
with System.OS_Interface;
|
|
-- used for various Constants, Signal and types
|
|
|
|
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);
|
|
|
|
-- Keep these variables global so that they are initialized only once
|
|
-- What are "these variables" ???, I see only one
|
|
|
|
Exception_Action : aliased struct_sigaction;
|
|
|
|
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 --
|
|
-----------------------
|
|
|
|
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;
|
|
My_Id : t_id;
|
|
|
|
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);
|
|
|
|
-- VxWorks will suspend the task when it gets a hardware
|
|
-- exception. We take the liberty of resuming the task
|
|
-- for the application.
|
|
|
|
My_Id := taskIdSelf;
|
|
|
|
if taskIsSuspended (My_Id) /= 0 then
|
|
Result := taskResume (My_Id);
|
|
end if;
|
|
|
|
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;
|
|
|
|
begin
|
|
declare
|
|
mask : aliased sigset_t;
|
|
Result : int;
|
|
|
|
function State (Int : Interrupt_ID) return Character;
|
|
pragma Import (C, State, "__gnat_get_interrupt_state");
|
|
-- Get interrupt state. Defined in a-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)
|
|
|
|
begin
|
|
-- Initialize signal handling
|
|
|
|
-- 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;
|
|
end System.Interrupt_Management;
|