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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 verson for VxWorks 5, VxWorks 6 Cert and VxWorks MILS
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33
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34 -- This file should be kept synchronized with the general implementation
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35 -- provided by s-stchop.adb.
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36
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37 pragma Restrictions (No_Elaboration_Code);
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38 -- We want to guarantee the absence of elaboration code because the
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39 -- binder does not handle references to this package.
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40
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41 with System.Storage_Elements; use System.Storage_Elements;
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42 with System.Parameters; use System.Parameters;
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43 with Interfaces.C;
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44
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45 package body System.Stack_Checking.Operations is
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46
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47 -- In order to have stack checking working appropriately on VxWorks we need
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48 -- to extract the stack size information from the VxWorks kernel itself.
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49
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50 -- For VxWorks 5 & 6 the library for showing task-related information
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51 -- needs to be linked into the VxWorks system, when using stack checking.
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52 -- The taskShow library can be linked into the VxWorks system by either:
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53
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54 -- * defining INCLUDE_SHOW_ROUTINES in config.h when using
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55 -- configuration header files, or
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56
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57 -- * selecting INCLUDE_TASK_SHOW when using the Tornado project
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58 -- facility.
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59
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60 -- VxWorks MILS includes the necessary routine in taskLib, so nothing
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61 -- special needs to be done there.
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62
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63 Stack_Limit : Address;
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64
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65 pragma Import (C, Stack_Limit, "__gnat_stack_limit");
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66
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67 -- Stack_Limit contains the limit of the stack. This variable is later made
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68 -- a task variable (by calling taskVarAdd) and then correctly set to the
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69 -- stack limit of the task. Before being so initialized its value must be
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70 -- valid so that any subprogram with stack checking enabled will run. We
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71 -- use extreme values according to the direction of the stack.
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72
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73 type Set_Stack_Limit_Proc_Acc is access procedure;
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74 pragma Convention (C, Set_Stack_Limit_Proc_Acc);
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75
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76 Set_Stack_Limit_Hook : Set_Stack_Limit_Proc_Acc;
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77 pragma Import (C, Set_Stack_Limit_Hook, "__gnat_set_stack_limit_hook");
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78 -- Procedure to be called when a task is created to set stack
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79 -- limit.
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80
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81 procedure Set_Stack_Limit_For_Current_Task;
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82 pragma Convention (C, Set_Stack_Limit_For_Current_Task);
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83 -- Register Initial_SP as the initial stack pointer value for the current
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84 -- task when it starts and Size as the associated stack area size. This
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85 -- should be called once, after the soft-links have been initialized?
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86
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87 -----------------------------
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88 -- Initialize_Stack_Limit --
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89 -----------------------------
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90
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91 procedure Initialize_Stack_Limit is
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92 begin
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93
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94 Set_Stack_Limit_For_Current_Task;
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95
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96 -- Will be called by every created task
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97
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98 Set_Stack_Limit_Hook := Set_Stack_Limit_For_Current_Task'Access;
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99 end Initialize_Stack_Limit;
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100
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101 --------------------------------------
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102 -- Set_Stack_Limit_For_Current_Task --
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103 --------------------------------------
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104
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105 procedure Set_Stack_Limit_For_Current_Task is
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106 type OS_Stack_Info is record
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107 Size : Interfaces.C.int;
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108 Base : System.Address;
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109 Limit : System.Address;
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110 end record;
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111 pragma Convention (C, OS_Stack_Info);
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112 -- Type representing the information that we want to extract from the
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113 -- underlying kernel.
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114
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115 procedure Get_Stack_Info (Stack : not null access OS_Stack_Info);
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116 pragma Import (C, Get_Stack_Info, "__gnat_get_stack_info");
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117 -- Procedure that fills the stack information associated to the
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118 -- currently executing task.
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119
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120 Stack_Info : aliased OS_Stack_Info;
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121
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122 Limit : System.Address;
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123
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124 begin
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125
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126 -- Get stack bounds from VxWorks
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127
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128 Get_Stack_Info (Stack_Info'Access);
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129
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130 if Stack_Grows_Down then
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131 Limit :=
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132 Stack_Info.Base - Storage_Offset (Stack_Info.Size) +
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133 Storage_Offset'(12_000);
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134 else
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135 Limit :=
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136 Stack_Info.Base + Storage_Offset (Stack_Info.Size) -
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137 Storage_Offset'(12_000);
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138 end if;
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139
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140 Stack_Limit := Limit;
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141
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142 end Set_Stack_Limit_For_Current_Task;
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143 end System.Stack_Checking.Operations;
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