1------------------------------------------------------------------------------
2--                                                                          --
3--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
4--                                                                          --
5--     S Y S T E M . S T A C K _ C H E C K I N G . O P E R A T I O N S      --
6--                                                                          --
7--                                  B o d y                                 --
8--                                                                          --
9--          Copyright (C) 1999-2009, 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 RTEMS version of this package.
33--  This file should be kept synchronized with the general implementation
34--  provided by s-stchop.adb.
35
36pragma Restrictions (No_Elaboration_Code);
37--  We want to guarantee the absence of elaboration code because the
38--  binder does not handle references to this package.
39
40with Ada.Exceptions;
41
42with Interfaces.C; use Interfaces.C;
43
44package body System.Stack_Checking.Operations is
45
46   ----------------------------
47   -- Invalidate_Stack_Cache --
48   ----------------------------
49
50   procedure Invalidate_Stack_Cache (Any_Stack : Stack_Access) is
51      pragma Warnings (Off, Any_Stack);
52   begin
53      Cache := Null_Stack;
54   end Invalidate_Stack_Cache;
55
56   -----------------------------
57   -- Notify_Stack_Attributes --
58   -----------------------------
59
60   procedure Notify_Stack_Attributes
61     (Initial_SP : System.Address;
62      Size       : System.Storage_Elements.Storage_Offset)
63   is
64
65      --  RTEMS keeps all the information we need.
66
67      pragma Unreferenced (Size);
68      pragma Unreferenced (Initial_SP);
69
70   begin
71      null;
72   end Notify_Stack_Attributes;
73
74   -----------------
75   -- Stack_Check --
76   -----------------
77
78   function Stack_Check
79     (Stack_Address : System.Address) return Stack_Access
80   is
81      pragma Unreferenced (Stack_Address);
82
83      --  RTEMS has a routine to check if the stack is blown.
84      --  It returns a C99 bool.
85      function rtems_stack_checker_is_blown return Interfaces.C.unsigned_char;
86      pragma Import (C,
87         rtems_stack_checker_is_blown, "rtems_stack_checker_is_blown");
88
89   begin
90      --  RTEMS has a routine to check this.  So use it.
91
92      if rtems_stack_checker_is_blown /= 0 then
93         Ada.Exceptions.Raise_Exception
94           (E       => Storage_Error'Identity,
95            Message => "stack overflow detected");
96      end if;
97
98      return null;
99
100   end Stack_Check;
101
102   ------------------------
103   -- Update_Stack_Cache --
104   ------------------------
105
106   procedure Update_Stack_Cache (Stack : Stack_Access) is
107   begin
108      if not Multi_Processor then
109         Cache := Stack;
110      end if;
111   end Update_Stack_Cache;
112
113end System.Stack_Checking.Operations;
114