gcc/ada/s-stchop-rtems.adb

   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) 1999-2008, 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 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,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  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.                                      --
  28 --                                                                          --
  29 -- GNARL was developed by the GNARL team at Florida State University.       --
  30 -- Extensive contributions were provided by Ada Core Technologies, Inc.     --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 --  This is the RTEMS version of this package.
  35 --  This file should be kept synchronized with the general implementation
  36 --  provided by s-stchop.adb.
  37
  38 pragma Restrictions (No_Elaboration_Code);
  39 --  We want to guarantee the absence of elaboration code because the
  40 --  binder does not handle references to this package.
  41
  42 with Ada.Exceptions;
  43
  44 with Interfaces.C; use Interfaces.C;
  45
  46 package body System.Stack_Checking.Operations is
  47
  48    ----------------------------
  49    -- Invalidate_Stack_Cache --
  50    ----------------------------
  51
  52    procedure Invalidate_Stack_Cache (Any_Stack : Stack_Access) is
  53       pragma Warnings (Off, Any_Stack);
  54    begin
  55       Cache := Null_Stack;
  56    end Invalidate_Stack_Cache;
  57
  58    -----------------------------
  59    -- Notify_Stack_Attributes --
  60    -----------------------------
  61
  62    procedure Notify_Stack_Attributes
  63      (Initial_SP : System.Address;
  64       Size       : System.Storage_Elements.Storage_Offset)
  65    is
  66
  67       --  RTEMS keeps all the information we need.
  68
  69       pragma Unreferenced (Size);
  70       pragma Unreferenced (Initial_SP);
  71
  72    begin
  73       null;
  74    end Notify_Stack_Attributes;
  75
  76    -----------------
  77    -- Stack_Check --
  78    -----------------
  79
  80    function Stack_Check
  81      (Stack_Address : System.Address) return Stack_Access
  82    is
  83       pragma Unreferenced (Stack_Address);
  84
  85       --  RTEMS has a routine to check this.  So use it.
  86       function rtems_stack_checker_is_blown return Interfaces.C.int;
  87       pragma Import (C,
  88          rtems_stack_checker_is_blown, "rtems_stack_checker_is_blown");
  89
  90    begin
  91       --  RTEMS has a routine to check this.  So use it.
  92
  93       if rtems_stack_checker_is_blown /= 0 then
  94          Ada.Exceptions.Raise_Exception
  95            (E       => Storage_Error'Identity,
  96             Message => "stack overflow detected");
  97       end if;
  98
  99       return null;
 100
 101    end Stack_Check;
 102
 103    ------------------------
 104    -- Update_Stack_Cache --
 105    ------------------------
 106
 107    procedure Update_Stack_Cache (Stack : Stack_Access) is
 108    begin
 109       if not Multi_Processor then
 110          Cache := Stack;
 111       end if;
 112    end Update_Stack_Cache;
 113
 114 end System.Stack_Checking.Operations;