1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
|
------------------------------------------------------------------------------
-- --
-- GNAT 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) 1992-2008, 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, 51 Franklin Street, Fifth Floor, --
-- Boston, MA 02110-1301, 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
-- 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.
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);
Exception_Action : aliased struct_sigaction;
-- Keep this variable global so that it is initialized only once
procedure Notify_Exception
(signo : Signal;
siginfo : System.Address;
sigcontext : System.Address);
pragma Import (C, Notify_Exception, "__gnat_error_handler");
-- Map signal to Ada exception and raise it. Different versions
-- of VxWorks need different mappings.
-----------------------
-- Local Subprograms --
-----------------------
function State (Int : Interrupt_ID) return Character;
pragma Import (C, State, "__gnat_get_interrupt_state");
-- Get interrupt state. Defined in 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)
---------------------------
-- 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;
----------------
-- Initialize --
----------------
Initialized : Boolean := False;
-- Set to True once Initialize is called, further calls have no effect
procedure Initialize is
mask : aliased sigset_t;
Result : int;
begin
if Initialized then
return;
end if;
Initialized := True;
-- Change this if you want to use another signal for task abort.
-- SIGTERM might be a good one.
Abort_Task_Interrupt := SIGABRT;
Exception_Action.sa_handler := Notify_Exception'Address;
Exception_Action.sa_flags := SA_ONSTACK + SA_SIGINFO;
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_Interrupt) := True;
end Initialize;
end System.Interrupt_Management;
|
