1 ------------------------------------------------------------------------------
3 -- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
5 -- 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 --
9 -- Copyright (C) 1992-2002 Free Software Foundation, Inc. --
11 -- GNARL is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNARL; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNARL was developed by the GNARL team at Florida State University. --
30 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
32 ------------------------------------------------------------------------------
34 -- This is the VxWorks version of this package.
36 -- It is likely to need tailoring to fit each operating system
37 -- and machine architecture.
39 -- PLEASE DO NOT add any dependences on other packages.
40 -- This package is designed to work with or without tasking support.
42 -- See the other warnings in the package specification before making
43 -- any modifications to this file.
45 -- Make a careful study of all signals available under the OS,
46 -- to see which need to be reserved, kept always unmasked,
47 -- or kept always unmasked.
48 -- Be on the lookout for special signals that
49 -- may be used by the thread library.
53 with System.OS_Interface;
54 -- used for various Constants, Signal and types
57 -- used for Raise_Exception
59 package body System.Interrupt_Management is
62 use System.OS_Interface;
63 use type Interfaces.C.int;
65 type Interrupt_List is array (Interrupt_ID range <>) of Interrupt_ID;
66 Exception_Interrupts : constant Interrupt_List (1 .. 4) :=
67 (SIGFPE, SIGILL, SIGSEGV, SIGBUS);
69 -- Keep these variables global so that they are initialized only once.
71 Exception_Action : aliased struct_sigaction;
73 ----------------------
74 -- Notify_Exception --
75 ----------------------
77 procedure Notify_Exception (signo : Signal);
78 -- Identify the Ada exception to be raised using
79 -- the information when the system received a synchronous signal.
81 procedure Notify_Exception (signo : Signal) is
82 Mask : aliased sigset_t;
87 Result := pthread_sigmask (SIG_SETMASK, null, Mask'Unchecked_Access);
88 Result := sigdelset (Mask'Access, signo);
89 Result := pthread_sigmask (SIG_SETMASK, Mask'Unchecked_Access, null);
91 -- VxWorks will suspend the task when it gets a hardware
92 -- exception. We take the liberty of resuming the task
93 -- for the application.
97 if taskIsSuspended (My_Id) /= 0 then
98 Result := taskResume (My_Id);
103 Raise_Exception (Constraint_Error'Identity, "SIGFPE");
105 Raise_Exception (Constraint_Error'Identity, "SIGILL");
108 (Program_Error'Identity,
109 "stack overflow or erroneous memory access");
111 Raise_Exception (Program_Error'Identity, "SIGBUS");
113 Raise_Exception (Program_Error'Identity, "unhandled signal");
115 end Notify_Exception;
117 ---------------------------
118 -- Initialize_Interrupts --
119 ---------------------------
121 -- Since there is no signal inheritance between VxWorks tasks, we need
122 -- to initialize signal handling in each task.
124 procedure Initialize_Interrupts is
126 old_act : aliased struct_sigaction;
129 for J in Exception_Interrupts'Range loop
132 (Signal (Exception_Interrupts (J)), Exception_Action'Access,
133 old_act'Unchecked_Access);
134 pragma Assert (Result = 0);
136 end Initialize_Interrupts;
140 mask : aliased sigset_t;
143 function State (Int : Interrupt_ID) return Character;
144 pragma Import (C, State, "__gnat_get_interrupt_state");
145 -- Get interrupt state. Defined in a-init.c
146 -- The input argument is the interrupt number,
147 -- and the result is one of the following:
149 Runtime : constant Character := 'r';
150 Default : constant Character := 's';
151 -- 'n' this interrupt not set by any Interrupt_State pragma
152 -- 'u' Interrupt_State pragma set state to User
153 -- 'r' Interrupt_State pragma set state to Runtime
154 -- 's' Interrupt_State pragma set state to System (use "default"
158 -- Initialize signal handling
160 -- Change this if you want to use another signal for task abort.
161 -- SIGTERM might be a good one.
163 Abort_Task_Interrupt := SIGABRT;
165 Exception_Action.sa_handler := Notify_Exception'Address;
166 Exception_Action.sa_flags := SA_ONSTACK;
167 Result := sigemptyset (mask'Access);
168 pragma Assert (Result = 0);
170 for J in Exception_Interrupts'Range loop
171 Result := sigaddset (mask'Access, Signal (Exception_Interrupts (J)));
172 pragma Assert (Result = 0);
175 Exception_Action.sa_mask := mask;
177 -- Initialize hardware interrupt handling
179 pragma Assert (Reserve = (Interrupt_ID'Range => False));
181 -- Check all interrupts for state that requires keeping them reserved
183 for J in Interrupt_ID'Range loop
184 if State (J) = Default or else State (J) = Runtime then
189 end System.Interrupt_Management;