1 ------------------------------------------------------------------------------
3 -- GNAT 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) 1992-2005 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, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, 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
56 package body System.Interrupt_Management is
58 use System.OS_Interface;
59 use type Interfaces.C.int;
61 type Signal_List is array (Signal_ID range <>) of Signal_ID;
62 Exception_Signals : constant Signal_List (1 .. 4) :=
63 (SIGFPE, SIGILL, SIGSEGV, SIGBUS);
65 Exception_Action : aliased struct_sigaction;
66 -- Keep this variable global so that it is initialized only once
68 procedure Map_And_Raise_Exception (signo : Signal);
69 pragma Import (C, Map_And_Raise_Exception, "__gnat_map_signal");
70 -- Map signal to Ada exception and raise it. Different versions
71 -- of VxWorks need different mappings.
73 -----------------------
74 -- Local Subprograms --
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 ----------------------
82 -- Notify_Exception --
83 ----------------------
85 procedure Notify_Exception (signo : Signal) is
86 Mask : aliased sigset_t;
89 pragma Unreferenced (Result);
92 Result := pthread_sigmask (SIG_SETMASK, null, Mask'Unchecked_Access);
93 Result := sigdelset (Mask'Access, signo);
94 Result := pthread_sigmask (SIG_SETMASK, Mask'Unchecked_Access, null);
96 Map_And_Raise_Exception (signo);
99 ---------------------------
100 -- Initialize_Interrupts --
101 ---------------------------
103 -- Since there is no signal inheritance between VxWorks tasks, we need
104 -- to initialize signal handling in each task.
106 procedure Initialize_Interrupts is
108 old_act : aliased struct_sigaction;
110 for J in Exception_Signals'Range loop
113 (Signal (Exception_Signals (J)), Exception_Action'Access,
114 old_act'Unchecked_Access);
115 pragma Assert (Result = 0);
117 end Initialize_Interrupts;
121 mask : aliased sigset_t;
124 function State (Int : Interrupt_ID) return Character;
125 pragma Import (C, State, "__gnat_get_interrupt_state");
126 -- Get interrupt state. Defined in a-init.c
127 -- The input argument is the interrupt number,
128 -- and the result is one of the following:
130 Runtime : constant Character := 'r';
131 Default : constant Character := 's';
132 -- 'n' this interrupt not set by any Interrupt_State pragma
133 -- 'u' Interrupt_State pragma set state to User
134 -- 'r' Interrupt_State pragma set state to Runtime
135 -- 's' Interrupt_State pragma set state to System (use "default"
139 -- Initialize signal handling
141 -- Change this if you want to use another signal for task abort.
142 -- SIGTERM might be a good one.
144 Abort_Task_Signal := SIGABRT;
146 Exception_Action.sa_handler := Notify_Exception'Address;
147 Exception_Action.sa_flags := SA_ONSTACK;
148 Result := sigemptyset (mask'Access);
149 pragma Assert (Result = 0);
151 for J in Exception_Signals'Range loop
152 Result := sigaddset (mask'Access, Signal (Exception_Signals (J)));
153 pragma Assert (Result = 0);
156 Exception_Action.sa_mask := mask;
158 -- Initialize hardware interrupt handling
160 pragma Assert (Reserve = (Interrupt_ID'Range => False));
162 -- Check all interrupts for state that requires keeping them reserved
164 for J in Interrupt_ID'Range loop
165 if State (J) = Default or else State (J) = Runtime then
170 -- Add exception signals to the set of unmasked signals
172 for J in Exception_Signals'Range loop
173 Keep_Unmasked (Exception_Signals (J)) := True;
176 -- The abort signal must also be unmasked
178 Keep_Unmasked (Abort_Task_Signal) := True;
180 end System.Interrupt_Management;