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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 -- (VxWorks/HIE Ravenscar Version PPC) --
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9 -- --
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145
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10 -- Copyright (C) 1992-2019, 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 -- This is a Ravenscar VxWorks version of this package for PowerPC targets
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38
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39 pragma Restrictions (No_Exception_Propagation);
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40 -- Only local exception handling is supported in this profile
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41
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42 pragma Restrictions (No_Exception_Registration);
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43 -- Disable exception name registration. This capability is not used because
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44 -- it is only required by exception stream attributes which are not supported
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45 -- in this run time.
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46
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47 pragma Restrictions (No_Implicit_Dynamic_Code);
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48 -- Pointers to nested subprograms are not allowed in this run time, in order
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49 -- to prevent the compiler from building "trampolines".
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50
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51 pragma Restrictions (No_Finalization);
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52 -- Controlled types are not supported in this run time
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53
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54 pragma Profile (Ravenscar);
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55 -- This is a Ravenscar run time
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56
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57 pragma Discard_Names;
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58 -- Disable explicitly the generation of names associated with entities in
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59 -- order to reduce the amount of storage used. These names are not used anyway
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60 -- (attributes such as 'Image and 'Value are not supported in this run time).
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61
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62 package System is
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63 pragma Pure;
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64 -- Note that we take advantage of the implementation permission to make
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65 -- this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada
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66 -- 2005, this is Pure in any case (AI-362).
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67
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68 pragma No_Elaboration_Code_All;
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69 -- Allow the use of that restriction in units that WITH this unit
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70
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71 type Name is (SYSTEM_NAME_GNAT);
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72 System_Name : constant Name := SYSTEM_NAME_GNAT;
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73
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74 -- System-Dependent Named Numbers
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75
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76 Min_Int : constant := Long_Long_Integer'First;
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77 Max_Int : constant := Long_Long_Integer'Last;
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78
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79 Max_Binary_Modulus : constant := 2 ** Long_Long_Integer'Size;
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80 Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
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81
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82 Max_Base_Digits : constant := Long_Long_Float'Digits;
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83 Max_Digits : constant := Long_Long_Float'Digits;
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84
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85 Max_Mantissa : constant := 63;
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86 Fine_Delta : constant := 2.0 ** (-Max_Mantissa);
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87
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88 Tick : constant := 1.0 / 60.0;
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89
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90 -- Storage-related Declarations
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91
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92 type Address is private;
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93 pragma Preelaborable_Initialization (Address);
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94 Null_Address : constant Address;
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95
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96 Storage_Unit : constant := 8;
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97 Word_Size : constant := 32;
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98 Memory_Size : constant := 2 ** 32;
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99
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100 -- Address comparison
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101
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102 function "<" (Left, Right : Address) return Boolean;
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103 function "<=" (Left, Right : Address) return Boolean;
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104 function ">" (Left, Right : Address) return Boolean;
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105 function ">=" (Left, Right : Address) return Boolean;
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106 function "=" (Left, Right : Address) return Boolean;
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107
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108 pragma Import (Intrinsic, "<");
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109 pragma Import (Intrinsic, "<=");
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110 pragma Import (Intrinsic, ">");
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111 pragma Import (Intrinsic, ">=");
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112 pragma Import (Intrinsic, "=");
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113
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114 -- Other System-Dependent Declarations
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115
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116 type Bit_Order is (High_Order_First, Low_Order_First);
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117 Default_Bit_Order : constant Bit_Order := High_Order_First;
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118 pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
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119
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120 -- Priority-related Declarations (RM D.1)
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121
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122 -- Ada priorities are mapped to VxWorks priorities using the following
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123 -- transformation: 255 - Ada Priority
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124
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125 -- Ada priorities are used as follows:
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126
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127 -- 256 is reserved for the VxWorks kernel
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128 -- 248 - 255 correspond to hardware interrupt levels 0 .. 7
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129 -- 247 is a catchall default "interrupt" priority for signals,
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130 -- allowing higher priority than normal tasks, but lower than
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131 -- hardware priority levels. Protected Object ceilings can
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132 -- override these values.
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133 -- 246 is used by the Interrupt_Manager task
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134
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135 Max_Priority : constant Positive := 245;
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136 Max_Interrupt_Priority : constant Positive := 255;
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137
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138 subtype Any_Priority is Integer range 0 .. 255;
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139 subtype Priority is Any_Priority range 0 .. 245;
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140 subtype Interrupt_Priority is Any_Priority range 246 .. 255;
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141
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142 Default_Priority : constant Priority := 122;
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143
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144 private
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145
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146 type Address is mod Memory_Size;
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147 Null_Address : constant Address := 0;
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148
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149 --------------------------------------
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150 -- System Implementation Parameters --
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151 --------------------------------------
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152
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153 -- These parameters provide information about the target that is used
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154 -- by the compiler. They are in the private part of System, where they
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155 -- can be accessed using the special circuitry in the Targparm unit
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156 -- whose source should be consulted for more detailed descriptions
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157 -- of the individual switch values.
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158
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159 Backend_Divide_Checks : constant Boolean := False;
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160 Backend_Overflow_Checks : constant Boolean := True;
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161 Command_Line_Args : constant Boolean := False;
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162 Configurable_Run_Time : constant Boolean := True;
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163 Denorm : constant Boolean := True;
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164 Duration_32_Bits : constant Boolean := True;
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165 Exit_Status_Supported : constant Boolean := True;
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166 Fractional_Fixed_Ops : constant Boolean := False;
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167 Frontend_Layout : constant Boolean := False;
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168 Machine_Overflows : constant Boolean := True;
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169 Machine_Rounds : constant Boolean := True;
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170 Preallocated_Stacks : constant Boolean := False;
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171 Signed_Zeros : constant Boolean := True;
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172 Stack_Check_Default : constant Boolean := False;
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173 Stack_Check_Probes : constant Boolean := False;
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174 Stack_Check_Limits : constant Boolean := True;
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175 Support_Aggregates : constant Boolean := True;
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176 Support_Composite_Assign : constant Boolean := True;
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177 Support_Composite_Compare : constant Boolean := True;
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178 Support_Long_Shifts : constant Boolean := True;
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179 Always_Compatible_Rep : constant Boolean := True;
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180 Suppress_Standard_Library : constant Boolean := True;
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181 Use_Ada_Main_Program_Name : constant Boolean := True;
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182 Frontend_Exceptions : constant Boolean := True;
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183 ZCX_By_Default : constant Boolean := False;
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184
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185 Executable_Extension : constant String := ".out";
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186
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187 end System;
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