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
|
------------------------------------------------------------------------------
-- --
-- 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) 1992-2002 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 Interrupt_List is array (Interrupt_ID range <>) of Interrupt_ID;
Exception_Interrupts : constant Interrupt_List (1 .. 4) :=
(SIGFPE, SIGILL, SIGSEGV, SIGBUS);
-- Keep these variables global so that they are initialized only once.
Exception_Action : aliased struct_sigaction;
----------------------
-- Notify_Exception --
----------------------
procedure Notify_Exception (signo : Signal);
-- Identify the Ada exception to be raised using
-- the information when the system received a synchronous signal.
procedure Notify_Exception (signo : Signal) is
Mask : aliased sigset_t;
Result : int;
My_Id : t_id;
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;
case signo is
when SIGFPE =>
raise Constraint_Error;
when SIGILL =>
raise Constraint_Error;
when SIGSEGV =>
raise Program_Error;
when SIGBUS =>
raise Program_Error;
when others =>
-- Unexpected signal
raise Program_Error;
end case;
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_Interrupts'Range loop
Result :=
sigaction
(Signal (Exception_Interrupts (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;
begin
Abort_Task_Interrupt := SIGABRT;
-- Change this if you want to use another signal for task abort.
-- SIGTERM might be a good one.
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_Interrupts'Range loop
Result := sigaddset (mask'Access, Signal (Exception_Interrupts (J)));
pragma Assert (Result = 0);
end loop;
Exception_Action.sa_mask := mask;
end;
end System.Interrupt_Management;
|
