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) 1992-2004 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
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 -- Keep these variables global so that they are initialized only once
66 -- What are "these variables" ???, I see only one
68 Exception_Action
: aliased struct_sigaction
;
70 procedure Map_And_Raise_Exception
(signo
: Signal
);
71 pragma Import
(C
, Map_And_Raise_Exception
, "__gnat_map_signal");
72 -- Map signal to Ada exception and raise it. Different versions
73 -- of VxWorks need different mappings.
75 -----------------------
76 -- Local Subprograms --
77 -----------------------
79 procedure Notify_Exception
(signo
: Signal
);
80 -- Identify the Ada exception to be raised using
81 -- the information when the system received a synchronous signal.
83 ----------------------
84 -- Notify_Exception --
85 ----------------------
87 procedure Notify_Exception
(signo
: Signal
) is
88 Mask
: aliased sigset_t
;
91 pragma Unreferenced
(Result
);
94 Result
:= pthread_sigmask
(SIG_SETMASK
, null, Mask
'Unchecked_Access);
95 Result
:= sigdelset
(Mask
'Access, signo
);
96 Result
:= pthread_sigmask
(SIG_SETMASK
, Mask
'Unchecked_Access, null);
98 Map_And_Raise_Exception
(signo
);
101 ---------------------------
102 -- Initialize_Interrupts --
103 ---------------------------
105 -- Since there is no signal inheritance between VxWorks tasks, we need
106 -- to initialize signal handling in each task.
108 procedure Initialize_Interrupts
is
110 old_act
: aliased struct_sigaction
;
113 for J
in Exception_Signals
'Range loop
116 (Signal
(Exception_Signals
(J
)), Exception_Action
'Access,
117 old_act
'Unchecked_Access);
118 pragma Assert
(Result
= 0);
120 end Initialize_Interrupts
;
124 mask
: aliased sigset_t
;
127 function State
(Int
: Interrupt_ID
) return Character;
128 pragma Import
(C
, State
, "__gnat_get_interrupt_state");
129 -- Get interrupt state. Defined in a-init.c
130 -- The input argument is the interrupt number,
131 -- and the result is one of the following:
133 Runtime
: constant Character := 'r';
134 Default
: constant Character := 's';
135 -- 'n' this interrupt not set by any Interrupt_State pragma
136 -- 'u' Interrupt_State pragma set state to User
137 -- 'r' Interrupt_State pragma set state to Runtime
138 -- 's' Interrupt_State pragma set state to System (use "default"
142 -- Initialize signal handling
144 -- Change this if you want to use another signal for task abort.
145 -- SIGTERM might be a good one.
147 Abort_Task_Signal
:= SIGABRT
;
149 Exception_Action
.sa_handler
:= Notify_Exception
'Address;
150 Exception_Action
.sa_flags
:= SA_ONSTACK
;
151 Result
:= sigemptyset
(mask
'Access);
152 pragma Assert
(Result
= 0);
154 for J
in Exception_Signals
'Range loop
155 Result
:= sigaddset
(mask
'Access, Signal
(Exception_Signals
(J
)));
156 pragma Assert
(Result
= 0);
159 Exception_Action
.sa_mask
:= mask
;
161 -- Initialize hardware interrupt handling
163 pragma Assert
(Reserve
= (Interrupt_ID
'Range => False));
165 -- Check all interrupts for state that requires keeping them reserved
167 for J
in Interrupt_ID
'Range loop
168 if State
(J
) = Default
or else State
(J
) = Runtime
then
173 -- Add exception signals to the set of unmasked signals
175 for J
in Exception_Signals
'Range loop
176 Keep_Unmasked
(Exception_Signals
(J
)) := True;
179 -- The abort signal must also be unmasked
181 Keep_Unmasked
(Abort_Task_Signal
) := True;
183 end System
.Interrupt_Management
;