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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 -- (Compiler Version) --
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9 -- --
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10 -- Copyright (C) 1992-2016 Free Software Foundation, Inc. --
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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 -- This version is for RTEMS. It is based as closely as possible on the
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38 -- generic version with the following exceptions:
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39 -- + priority definitions
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40
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41 package System is
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42 pragma Pure;
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43 -- Note that we take advantage of the implementation permission to make
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44 -- this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada
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45 -- 2005, this is Pure in any case (AI-362).
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46
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47 pragma No_Elaboration_Code_All;
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48 -- Allow the use of that restriction in units that WITH this unit
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49
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50 type Name is (SYSTEM_NAME_GNAT);
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51 System_Name : constant Name := SYSTEM_NAME_GNAT;
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52
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53 -- System-Dependent Named Numbers
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54
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55 Min_Int : constant := Long_Long_Integer'First;
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56 Max_Int : constant := Long_Long_Integer'Last;
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57
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58 Max_Binary_Modulus : constant := 2 ** Long_Long_Integer'Size;
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59 Max_Nonbinary_Modulus : constant := Integer'Last;
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60
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61 Max_Base_Digits : constant := Long_Long_Float'Digits;
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62 Max_Digits : constant := Long_Long_Float'Digits;
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63
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64 Max_Mantissa : constant := 63;
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65 Fine_Delta : constant := 2.0 ** (-Max_Mantissa);
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66
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67 Tick : constant := 0.01;
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68
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69 -- Storage-related Declarations
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70
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71 type Address is private;
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72 pragma Preelaborable_Initialization (Address);
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73 Null_Address : constant Address;
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74
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75 Storage_Unit : constant := Standard'Storage_Unit;
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76 Word_Size : constant := Standard'Word_Size;
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77 Memory_Size : constant := 2 ** Standard'Address_Size;
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78
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79 -- Address comparison
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80
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81 function "<" (Left, Right : Address) return Boolean;
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82 function "<=" (Left, Right : Address) return Boolean;
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83 function ">" (Left, Right : Address) return Boolean;
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84 function ">=" (Left, Right : Address) return Boolean;
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85 function "=" (Left, Right : Address) return Boolean;
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86
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87 pragma Import (Intrinsic, "<");
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88 pragma Import (Intrinsic, "<=");
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89 pragma Import (Intrinsic, ">");
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90 pragma Import (Intrinsic, ">=");
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91 pragma Import (Intrinsic, "=");
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92
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93 -- Other System-Dependent Declarations
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94
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95 type Bit_Order is (High_Order_First, Low_Order_First);
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96 Default_Bit_Order : constant Bit_Order :=
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97 Bit_Order'Val (Standard'Default_Bit_Order);
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98 pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
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99
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100 -- Priority-related Declarations (RM D.1)
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101
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102 -- RTEMS POSIX threads support 256 priority levels with 255 being
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103 -- logically the most important. Levels 0 and 255 are reserved.
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104 --
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105 -- 255 is reserved for RTEMS system tasks
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106 -- 247 - 254 correspond to hardware interrupt levels 0 .. 7
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107 -- 246 is a catchall default "interrupt" priority for signals,
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108 -- allowing higher priority than normal tasks, but lower than
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109 -- hardware priority levels. Protected Object ceilings can
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110 -- override these values.
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111 -- 245 is used by the Interrupt_Manager task
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112 -- 0 is reserved for the RTEMS IDLE task and really should not
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113 -- be accessible from Ada but GNAT initializes
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114 -- Current_Priority to 0 so it must be valid
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115
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116 Max_Priority : constant Positive := 244;
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117 Max_Interrupt_Priority : constant Positive := 254;
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118
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119 subtype Any_Priority is Integer range 0 .. 254;
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120 subtype Priority is Any_Priority range 0 .. 244;
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121 subtype Interrupt_Priority is Any_Priority range 245 .. 254;
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122
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123 Default_Priority : constant Priority := 122;
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124
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125 private
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126
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127 type Address is mod Memory_Size;
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128 Null_Address : constant Address := 0;
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129
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130 --------------------------------------
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131 -- System Implementation Parameters --
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132 --------------------------------------
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133
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134 -- These parameters provide information about the target that is used
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135 -- by the compiler. They are in the private part of System, where they
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136 -- can be accessed using the special circuitry in the Targparm unit
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137 -- whose source should be consulted for more detailed descriptions
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138 -- of the individual switch values.
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139
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140 Backend_Divide_Checks : constant Boolean := False;
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141 Backend_Overflow_Checks : constant Boolean := True;
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142 Command_Line_Args : constant Boolean := True;
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143 Configurable_Run_Time : constant Boolean := False;
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144 Denorm : constant Boolean := True;
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145 Duration_32_Bits : constant Boolean := False;
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146 Exit_Status_Supported : constant Boolean := True;
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147 Fractional_Fixed_Ops : constant Boolean := False;
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148 Frontend_Layout : constant Boolean := False;
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149 Machine_Overflows : constant Boolean := False;
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150 Machine_Rounds : constant Boolean := True;
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151 Preallocated_Stacks : constant Boolean := False;
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152 Signed_Zeros : constant Boolean := True;
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153 Stack_Check_Default : constant Boolean := False;
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154 Stack_Check_Probes : constant Boolean := False;
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155 Stack_Check_Limits : constant Boolean := False;
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156 Support_Aggregates : constant Boolean := True;
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157 Support_Composite_Assign : constant Boolean := True;
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158 Support_Composite_Compare : constant Boolean := True;
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159 Support_Long_Shifts : constant Boolean := True;
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160 Always_Compatible_Rep : constant Boolean := False;
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161 Suppress_Standard_Library : constant Boolean := False;
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162 Use_Ada_Main_Program_Name : constant Boolean := False;
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131
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163 Frontend_Exceptions : constant Boolean := False;
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164 ZCX_By_Default : constant Boolean := True;
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111
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165
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166 end System;
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