1------------------------------------------------------------------------------ 2-- -- 3-- GNAT RUN-TIME COMPONENTS -- 4-- -- 5-- S Y S T E M -- 6-- -- 7-- S p e c -- 8-- (VxWorks/HIE Ravenscar Version PPC) -- 9-- -- 10-- Copyright (C) 1992-2018, Free Software Foundation, Inc. -- 11-- -- 12-- This specification is derived from the Ada Reference Manual for use with -- 13-- GNAT. The copyright notice above, and the license provisions that follow -- 14-- apply solely to the contents of the part following the private keyword. -- 15-- -- 16-- GNAT is free software; you can redistribute it and/or modify it under -- 17-- terms of the GNU General Public License as published by the Free Soft- -- 18-- ware Foundation; either version 3, or (at your option) any later ver- -- 19-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- 20-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- 21-- or FITNESS FOR A PARTICULAR PURPOSE. -- 22-- -- 23-- As a special exception under Section 7 of GPL version 3, you are granted -- 24-- additional permissions described in the GCC Runtime Library Exception, -- 25-- version 3.1, as published by the Free Software Foundation. -- 26-- -- 27-- You should have received a copy of the GNU General Public License and -- 28-- a copy of the GCC Runtime Library Exception along with this program; -- 29-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- 30-- <http://www.gnu.org/licenses/>. -- 31-- -- 32-- GNAT was originally developed by the GNAT team at New York University. -- 33-- Extensive contributions were provided by Ada Core Technologies Inc. -- 34-- -- 35------------------------------------------------------------------------------ 36 37-- This is a Ravenscar VxWorks version of this package for PowerPC targets 38 39pragma Restrictions (No_Exception_Propagation); 40-- Only local exception handling is supported in this profile 41 42pragma Restrictions (No_Exception_Registration); 43-- Disable exception name registration. This capability is not used because 44-- it is only required by exception stream attributes which are not supported 45-- in this run time. 46 47pragma Restrictions (No_Implicit_Dynamic_Code); 48-- Pointers to nested subprograms are not allowed in this run time, in order 49-- to prevent the compiler from building "trampolines". 50 51pragma Restrictions (No_Finalization); 52-- Controlled types are not supported in this run time 53 54pragma Profile (Ravenscar); 55-- This is a Ravenscar run time 56 57pragma Discard_Names; 58-- Disable explicitly the generation of names associated with entities in 59-- order to reduce the amount of storage used. These names are not used anyway 60-- (attributes such as 'Image and 'Value are not supported in this run time). 61 62package System is 63 pragma Pure; 64 -- Note that we take advantage of the implementation permission to make 65 -- this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada 66 -- 2005, this is Pure in any case (AI-362). 67 68 pragma No_Elaboration_Code_All; 69 -- Allow the use of that restriction in units that WITH this unit 70 71 type Name is (SYSTEM_NAME_GNAT); 72 System_Name : constant Name := SYSTEM_NAME_GNAT; 73 74 -- System-Dependent Named Numbers 75 76 Min_Int : constant := Long_Long_Integer'First; 77 Max_Int : constant := Long_Long_Integer'Last; 78 79 Max_Binary_Modulus : constant := 2 ** Long_Long_Integer'Size; 80 Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1; 81 82 Max_Base_Digits : constant := Long_Long_Float'Digits; 83 Max_Digits : constant := Long_Long_Float'Digits; 84 85 Max_Mantissa : constant := 63; 86 Fine_Delta : constant := 2.0 ** (-Max_Mantissa); 87 88 Tick : constant := 1.0 / 60.0; 89 90 -- Storage-related Declarations 91 92 type Address is private; 93 pragma Preelaborable_Initialization (Address); 94 Null_Address : constant Address; 95 96 Storage_Unit : constant := 8; 97 Word_Size : constant := 32; 98 Memory_Size : constant := 2 ** 32; 99 100 -- Address comparison 101 102 function "<" (Left, Right : Address) return Boolean; 103 function "<=" (Left, Right : Address) return Boolean; 104 function ">" (Left, Right : Address) return Boolean; 105 function ">=" (Left, Right : Address) return Boolean; 106 function "=" (Left, Right : Address) return Boolean; 107 108 pragma Import (Intrinsic, "<"); 109 pragma Import (Intrinsic, "<="); 110 pragma Import (Intrinsic, ">"); 111 pragma Import (Intrinsic, ">="); 112 pragma Import (Intrinsic, "="); 113 114 -- Other System-Dependent Declarations 115 116 type Bit_Order is (High_Order_First, Low_Order_First); 117 Default_Bit_Order : constant Bit_Order := High_Order_First; 118 pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning 119 120 -- Priority-related Declarations (RM D.1) 121 122 -- Ada priorities are mapped to VxWorks priorities using the following 123 -- transformation: 255 - Ada Priority 124 125 -- Ada priorities are used as follows: 126 127 -- 256 is reserved for the VxWorks kernel 128 -- 248 - 255 correspond to hardware interrupt levels 0 .. 7 129 -- 247 is a catchall default "interrupt" priority for signals, 130 -- allowing higher priority than normal tasks, but lower than 131 -- hardware priority levels. Protected Object ceilings can 132 -- override these values. 133 -- 246 is used by the Interrupt_Manager task 134 135 Max_Priority : constant Positive := 245; 136 Max_Interrupt_Priority : constant Positive := 255; 137 138 subtype Any_Priority is Integer range 0 .. 255; 139 subtype Priority is Any_Priority range 0 .. 245; 140 subtype Interrupt_Priority is Any_Priority range 246 .. 255; 141 142 Default_Priority : constant Priority := 122; 143 144private 145 146 type Address is mod Memory_Size; 147 Null_Address : constant Address := 0; 148 149 -------------------------------------- 150 -- System Implementation Parameters -- 151 -------------------------------------- 152 153 -- These parameters provide information about the target that is used 154 -- by the compiler. They are in the private part of System, where they 155 -- can be accessed using the special circuitry in the Targparm unit 156 -- whose source should be consulted for more detailed descriptions 157 -- of the individual switch values. 158 159 Backend_Divide_Checks : constant Boolean := False; 160 Backend_Overflow_Checks : constant Boolean := True; 161 Command_Line_Args : constant Boolean := False; 162 Configurable_Run_Time : constant Boolean := True; 163 Denorm : constant Boolean := True; 164 Duration_32_Bits : constant Boolean := True; 165 Exit_Status_Supported : constant Boolean := True; 166 Fractional_Fixed_Ops : constant Boolean := False; 167 Frontend_Layout : constant Boolean := False; 168 Machine_Overflows : constant Boolean := True; 169 Machine_Rounds : constant Boolean := True; 170 Preallocated_Stacks : constant Boolean := False; 171 Signed_Zeros : constant Boolean := True; 172 Stack_Check_Default : constant Boolean := False; 173 Stack_Check_Probes : constant Boolean := False; 174 Stack_Check_Limits : constant Boolean := True; 175 Support_Aggregates : constant Boolean := True; 176 Support_Composite_Assign : constant Boolean := True; 177 Support_Composite_Compare : constant Boolean := True; 178 Support_Long_Shifts : constant Boolean := True; 179 Always_Compatible_Rep : constant Boolean := True; 180 Suppress_Standard_Library : constant Boolean := True; 181 Use_Ada_Main_Program_Name : constant Boolean := True; 182 Frontend_Exceptions : constant Boolean := True; 183 ZCX_By_Default : constant Boolean := False; 184 185 Executable_Extension : constant String := ".out"; 186 187end System; 188