OpenCores
URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [ada/] [s-intman-susv3.adb] - Blame information for rev 706

Details | Compare with Previous | View Log

Line No. Rev Author Line
1 706 jeremybenn
------------------------------------------------------------------------------
2
--                                                                          --
3
--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
4
--                                                                          --
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          --
6
--                                                                          --
7
--                                  B o d y                                 --
8
--                                                                          --
9
--          Copyright (C) 1992-2009, Free Software Foundation, Inc.         --
10
--                                                                          --
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 3,  or (at your option) any later ver- --
14
-- sion.  GNAT 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.                                     --
17
--                                                                          --
18
-- As a special exception under Section 7 of GPL version 3, you are granted --
19
-- additional permissions described in the GCC Runtime Library Exception,   --
20
-- version 3.1, as published by the Free Software Foundation.               --
21
--                                                                          --
22
-- You should have received a copy of the GNU General Public License and    --
23
-- a copy of the GCC Runtime Library Exception along with this program;     --
24
-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
25
-- <http://www.gnu.org/licenses/>.                                          --
26
--                                                                          --
27
-- GNARL was developed by the GNARL team at Florida State University.       --
28
-- Extensive contributions were provided by Ada Core Technologies, Inc.     --
29
--                                                                          --
30
------------------------------------------------------------------------------
31
 
32
--  This is the SuSV3 threads version of this package
33
 
34
--  Make a careful study of all signals available under the OS, to see which
35
--  need to be reserved, kept always unmasked, or kept always unmasked. Be on
36
--  the lookout for special signals that may be used by the thread library.
37
 
38
--  Since this is a multi target file, the signal <-> exception mapping
39
--  is simple minded. If you need a more precise and target specific
40
--  signal handling, create a new s-intman.adb that will fit your needs.
41
 
42
--  This file assumes that:
43
 
44
--    SIGINT exists and will be kept unmasked unless the pragma
45
--     Unreserve_All_Interrupts is specified anywhere in the application.
46
 
47
--    System.OS_Interface contains the following:
48
--      SIGADAABORT: the signal that will be used to abort tasks.
49
--      Unmasked: the OS specific set of signals that should be unmasked in
50
--                all the threads. SIGADAABORT is unmasked by
51
--                default
52
--      Reserved: the OS specific set of signals that are reserved.
53
 
54
package body System.Interrupt_Management is
55
 
56
   use Interfaces.C;
57
   use System.OS_Interface;
58
 
59
   Unreserve_All_Interrupts : Interfaces.C.int;
60
   pragma Import
61
     (C, Unreserve_All_Interrupts, "__gl_unreserve_all_interrupts");
62
 
63
   -----------------------
64
   -- Local Subprograms --
65
   -----------------------
66
 
67
   function State (Int : Interrupt_ID) return Character;
68
   pragma Import (C, State, "__gnat_get_interrupt_state");
69
   --  Get interrupt state. Defined in init.c The input argument is the
70
   --  interrupt number, and the result is one of the following:
71
 
72
   User    : constant Character := 'u';
73
   Runtime : constant Character := 'r';
74
   Default : constant Character := 's';
75
   --    'n'   this interrupt not set by any Interrupt_State pragma
76
   --    'u'   Interrupt_State pragma set state to User
77
   --    'r'   Interrupt_State pragma set state to Runtime
78
   --    's'   Interrupt_State pragma set state to System (use "default"
79
   --           system handler)
80
 
81
   ----------------
82
   -- Initialize --
83
   ----------------
84
 
85
   Initialized : Boolean := False;
86
 
87
   procedure Initialize is
88
   begin
89
      if Initialized then
90
         return;
91
      end if;
92
 
93
      Initialized := True;
94
 
95
      --  Need to call pthread_init very early because it is doing signal
96
      --  initializations.
97
 
98
      pthread_init;
99
 
100
      Abort_Task_Interrupt := SIGADAABORT;
101
 
102
      pragma Assert (Keep_Unmasked = (Interrupt_ID'Range => False));
103
      pragma Assert (Reserve = (Interrupt_ID'Range => False));
104
 
105
      --  Process state of exception signals
106
 
107
      for J in Exception_Signals'Range loop
108
         declare
109
            Sig : constant Signal := Exception_Signals (J);
110
            Id : constant Interrupt_ID := Interrupt_ID (Sig);
111
         begin
112
            if State (Id) /= User then
113
               Keep_Unmasked (Id) := True;
114
               Reserve (Id) := True;
115
            end if;
116
         end;
117
      end loop;
118
 
119
      if State (Abort_Task_Interrupt) /= User then
120
         Keep_Unmasked (Abort_Task_Interrupt) := True;
121
         Reserve (Abort_Task_Interrupt) := True;
122
      end if;
123
 
124
      --  Set SIGINT to unmasked state as long as it is not in "User" state.
125
      --  Check for Unreserve_All_Interrupts last.
126
 
127
      if State (SIGINT) /= User then
128
         Keep_Unmasked (SIGINT) := True;
129
         Reserve (SIGINT) := True;
130
      end if;
131
 
132
      --  Check all signals for state that requires keeping them unmasked and
133
      --  reserved.
134
 
135
      for J in Interrupt_ID'Range loop
136
         if State (J) = Default or else State (J) = Runtime then
137
            Keep_Unmasked (J) := True;
138
            Reserve (J) := True;
139
         end if;
140
      end loop;
141
 
142
      --  Add the set of signals that must always be unmasked for this target
143
 
144
      for J in Unmasked'Range loop
145
         Keep_Unmasked (Interrupt_ID (Unmasked (J))) := True;
146
         Reserve (Interrupt_ID (Unmasked (J))) := True;
147
      end loop;
148
 
149
      --  Add target-specific reserved signals
150
 
151
      for J in Reserved'Range loop
152
         Reserve (Interrupt_ID (Reserved (J))) := True;
153
      end loop;
154
 
155
      --  Process pragma Unreserve_All_Interrupts. This overrides any settings
156
      --  due to pragma Interrupt_State:
157
 
158
      if Unreserve_All_Interrupts /= 0 then
159
         Keep_Unmasked (SIGINT) := False;
160
         Reserve (SIGINT) := False;
161
      end if;
162
 
163
      --  We do not really have Signal 0. We just use this value to identify
164
      --  non-existent signals (see s-intnam.ads). Therefore, Signal should not
165
      --  be used in all signal related operations hence mark it as reserved.
166
 
167
      Reserve (0) := True;
168
   end Initialize;
169
 
170
end System.Interrupt_Management;

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.