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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
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4 -- --
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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 --
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6 -- --
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7 -- B o d y --
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8 -- --
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131
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9 -- Copyright (C) 1999-2018, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- GNARL is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNARL was developed by the GNARL team at Florida State University. --
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28 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 -- This is the RTEMS version of this package.
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33 -- This file should be kept synchronized with the general implementation
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34 -- provided by s-stchop.adb.
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35
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36 pragma Restrictions (No_Elaboration_Code);
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37 -- We want to guarantee the absence of elaboration code because the
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38 -- binder does not handle references to this package.
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39
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40 with Ada.Exceptions;
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41
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42 with Interfaces.C; use Interfaces.C;
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43
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44 package body System.Stack_Checking.Operations is
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45
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46 ----------------------------
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47 -- Invalidate_Stack_Cache --
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48 ----------------------------
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49
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50 procedure Invalidate_Stack_Cache (Any_Stack : Stack_Access) is
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51 pragma Warnings (Off, Any_Stack);
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52 begin
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53 Cache := Null_Stack;
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54 end Invalidate_Stack_Cache;
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55
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56 -----------------------------
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57 -- Notify_Stack_Attributes --
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58 -----------------------------
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59
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60 procedure Notify_Stack_Attributes
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61 (Initial_SP : System.Address;
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62 Size : System.Storage_Elements.Storage_Offset)
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63 is
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64
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65 -- RTEMS keeps all the information we need.
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66
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67 pragma Unreferenced (Size);
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68 pragma Unreferenced (Initial_SP);
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69
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70 begin
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71 null;
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72 end Notify_Stack_Attributes;
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73
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74 -----------------
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75 -- Stack_Check --
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76 -----------------
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77
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78 function Stack_Check
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79 (Stack_Address : System.Address) return Stack_Access
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80 is
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81 pragma Unreferenced (Stack_Address);
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82
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83 -- RTEMS has a routine to check if the stack is blown.
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84 -- It returns a C99 bool.
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85 function rtems_stack_checker_is_blown return Interfaces.C.unsigned_char;
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86 pragma Import (C,
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87 rtems_stack_checker_is_blown, "rtems_stack_checker_is_blown");
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88
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89 begin
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90 -- RTEMS has a routine to check this. So use it.
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91
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92 if rtems_stack_checker_is_blown /= 0 then
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93 Ada.Exceptions.Raise_Exception
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94 (E => Storage_Error'Identity,
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95 Message => "stack overflow detected");
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96 end if;
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97
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98 return null;
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99
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100 end Stack_Check;
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101
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102 ------------------------
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103 -- Update_Stack_Cache --
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104 ------------------------
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105
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106 procedure Update_Stack_Cache (Stack : Stack_Access) is
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107 begin
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108 if not Multi_Processor then
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109 Cache := Stack;
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110 end if;
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111 end Update_Stack_Cache;
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112
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113 end System.Stack_Checking.Operations;
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