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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME COMPONENTS --
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4 -- --
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5 -- S Y S T E M --
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6 -- --
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7 -- S p e c --
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8 -- (LynxOS-178 PPC Version) --
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9 -- --
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131
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10 -- Copyright (C) 2009-2018, Free Software Foundation, Inc. --
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111
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11 -- --
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12 -- This specification is derived from the Ada Reference Manual for use with --
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13 -- GNAT. The copyright notice above, and the license provisions that follow --
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14 -- apply solely to the contents of the part following the private keyword. --
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15 -- --
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16 -- GNAT is free software; you can redistribute it and/or modify it under --
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17 -- terms of the GNU General Public License as published by the Free Soft- --
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18 -- ware Foundation; either version 3, or (at your option) any later ver- --
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19 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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20 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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21 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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22 -- --
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23 -- As a special exception under Section 7 of GPL version 3, you are granted --
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24 -- additional permissions described in the GCC Runtime Library Exception, --
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25 -- version 3.1, as published by the Free Software Foundation. --
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26 -- --
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27 -- You should have received a copy of the GNU General Public License and --
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28 -- a copy of the GCC Runtime Library Exception along with this program; --
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29 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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30 -- <http://www.gnu.org/licenses/>. --
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31 -- --
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32 -- GNAT was originally developed by the GNAT team at New York University. --
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33 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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34 -- --
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35 ------------------------------------------------------------------------------
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36
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37 package System is
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38 pragma Pure;
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39 -- Note that we take advantage of the implementation permission to make
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40 -- this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada
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41 -- 2005, this is Pure in any case (AI-362).
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42
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43 pragma No_Elaboration_Code_All;
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44 -- Allow the use of that restriction in units that WITH this unit
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45
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46 type Name is (SYSTEM_NAME_GNAT);
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47 System_Name : constant Name := SYSTEM_NAME_GNAT;
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48
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49 -- System-Dependent Named Numbers
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50
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51 Min_Int : constant := Long_Long_Integer'First;
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52 Max_Int : constant := Long_Long_Integer'Last;
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53
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54 Max_Binary_Modulus : constant := 2 ** Long_Long_Integer'Size;
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55 Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
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56
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57 Max_Base_Digits : constant := Long_Long_Float'Digits;
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58 Max_Digits : constant := Long_Long_Float'Digits;
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59
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60 Max_Mantissa : constant := 63;
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61 Fine_Delta : constant := 2.0 ** (-Max_Mantissa);
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62
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63 Tick : constant := 0.01;
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64
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65 -- Storage-related Declarations
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66
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67 type Address is private;
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68 pragma Preelaborable_Initialization (Address);
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69 Null_Address : constant Address;
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70
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71 Storage_Unit : constant := 8;
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72 Word_Size : constant := 32;
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73 Memory_Size : constant := 2 ** 32;
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74
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75 -- Address comparison
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76
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77 function "<" (Left, Right : Address) return Boolean;
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78 function "<=" (Left, Right : Address) return Boolean;
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79 function ">" (Left, Right : Address) return Boolean;
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80 function ">=" (Left, Right : Address) return Boolean;
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81 function "=" (Left, Right : Address) return Boolean;
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82
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83 pragma Import (Intrinsic, "<");
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84 pragma Import (Intrinsic, "<=");
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85 pragma Import (Intrinsic, ">");
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86 pragma Import (Intrinsic, ">=");
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87 pragma Import (Intrinsic, "=");
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88
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89 -- Other System-Dependent Declarations
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90
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91 type Bit_Order is (High_Order_First, Low_Order_First);
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92 Default_Bit_Order : constant Bit_Order := High_Order_First;
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93 pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
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94
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95 -- Priority-related Declarations (RM D.1)
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96
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97 -- 17 is the system determined default priority for user applications
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98 -- running on LynxOS.
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99
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100 -- The standard (Rm 13.7) requires that Default_Priority has the value:
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101
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102 -- (Priority'First + Priority'Last) / 2
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103
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104 -- However, the default priority given by the OS is not the same thing as
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105 -- the Ada value Default_Prioirity (previous examples include VxWorks).
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106 -- Therefore, we follow a model based on the full range of LynxOS-178
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107 -- priorities.
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108
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109 Max_Priority : constant Positive := 252;
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110 Max_Interrupt_Priority : constant Positive := 255;
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111
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112 subtype Any_Priority is Integer range 0 .. 255;
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113 subtype Priority is Any_Priority range 0 .. 252;
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114 subtype Interrupt_Priority is Any_Priority range 253 .. 255;
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115
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116 Default_Priority : constant Priority := 126;
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117
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118 -- Note that the priority of the environment task is set externally by the
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119 -- OS
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120
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121 private
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122
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123 type Address is mod Memory_Size;
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124 Null_Address : constant Address := 0;
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125
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126 --------------------------------------
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127 -- System Implementation Parameters --
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128 --------------------------------------
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129
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130 -- These parameters provide information about the target that is used
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131 -- by the compiler. They are in the private part of System, where they
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132 -- can be accessed using the special circuitry in the Targparm unit
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133 -- whose source should be consulted for more detailed descriptions
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134 -- of the individual switch values.
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135
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136 Backend_Divide_Checks : constant Boolean := False;
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137 Backend_Overflow_Checks : constant Boolean := True;
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138 Command_Line_Args : constant Boolean := True;
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139 Configurable_Run_Time : constant Boolean := False;
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140 Denorm : constant Boolean := True;
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141 Duration_32_Bits : constant Boolean := False;
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142 Exit_Status_Supported : constant Boolean := True;
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143 Fractional_Fixed_Ops : constant Boolean := False;
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144 Frontend_Layout : constant Boolean := False;
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145 Machine_Overflows : constant Boolean := False;
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146 Machine_Rounds : constant Boolean := True;
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147 Preallocated_Stacks : constant Boolean := False;
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148 Signed_Zeros : constant Boolean := True;
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149 Stack_Check_Default : constant Boolean := False;
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150 Stack_Check_Probes : constant Boolean := True;
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151 Stack_Check_Limits : constant Boolean := False;
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152 Support_Aggregates : constant Boolean := True;
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153 Support_Composite_Assign : constant Boolean := True;
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154 Support_Composite_Compare : constant Boolean := True;
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155 Support_Long_Shifts : constant Boolean := True;
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156 Always_Compatible_Rep : constant Boolean := False;
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157 Suppress_Standard_Library : constant Boolean := False;
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158 Use_Ada_Main_Program_Name : constant Boolean := False;
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159 Frontend_Exceptions : constant Boolean := False;
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160 ZCX_By_Default : constant Boolean := False;
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161
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162 end System;
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