1------------------------------------------------------------------------------ 2-- -- 3-- GNAT RUN-TIME COMPONENTS -- 4-- -- 5-- S Y S T E M -- 6-- -- 7-- S p e c -- 8-- (Compiler Version) -- 9-- -- 10-- Copyright (C) 1992-2021, 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 version is for RTEMS. It is based as closely as possible on the 38-- generic version with the following exceptions: 39-- + priority definitions 40 41package System is 42 pragma Pure; 43 -- Note that we take advantage of the implementation permission to make 44 -- this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada 45 -- 2005, this is Pure in any case (AI-362). 46 47 pragma No_Elaboration_Code_All; 48 -- Allow the use of that restriction in units that WITH this unit 49 50 type Name is (SYSTEM_NAME_GNAT); 51 System_Name : constant Name := SYSTEM_NAME_GNAT; 52 53 -- System-Dependent Named Numbers 54 55 Min_Int : constant := -2 ** (Standard'Max_Integer_Size - 1); 56 Max_Int : constant := 2 ** (Standard'Max_Integer_Size - 1) - 1; 57 58 Max_Binary_Modulus : constant := 2 ** Standard'Max_Integer_Size; 59 Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1; 60 61 Max_Base_Digits : constant := Long_Long_Float'Digits; 62 Max_Digits : constant := Long_Long_Float'Digits; 63 64 Max_Mantissa : constant := Standard'Max_Integer_Size - 1; 65 Fine_Delta : constant := 2.0 ** (-Max_Mantissa); 66 67 Tick : constant := 0.01; 68 69 -- Storage-related Declarations 70 71 type Address is private; 72 pragma Preelaborable_Initialization (Address); 73 Null_Address : constant Address; 74 75 Storage_Unit : constant := Standard'Storage_Unit; 76 Word_Size : constant := Standard'Word_Size; 77 Memory_Size : constant := 2 ** Standard'Address_Size; 78 79 -- Address comparison 80 81 function "<" (Left, Right : Address) return Boolean; 82 function "<=" (Left, Right : Address) return Boolean; 83 function ">" (Left, Right : Address) return Boolean; 84 function ">=" (Left, Right : Address) return Boolean; 85 function "=" (Left, Right : Address) return Boolean; 86 87 pragma Import (Intrinsic, "<"); 88 pragma Import (Intrinsic, "<="); 89 pragma Import (Intrinsic, ">"); 90 pragma Import (Intrinsic, ">="); 91 pragma Import (Intrinsic, "="); 92 93 -- Other System-Dependent Declarations 94 95 type Bit_Order is (High_Order_First, Low_Order_First); 96 Default_Bit_Order : constant Bit_Order := 97 Bit_Order'Val (Standard'Default_Bit_Order); 98 pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning 99 100 -- Priority-related Declarations (RM D.1) 101 102 -- RTEMS POSIX threads support 256 priority levels with 255 being 103 -- logically the most important. Levels 0 and 255 are reserved. 104 -- 105 -- 255 is reserved for RTEMS system tasks 106 -- 247 - 254 correspond to hardware interrupt levels 0 .. 7 107 -- 246 is a catchall default "interrupt" priority for signals, 108 -- allowing higher priority than normal tasks, but lower than 109 -- hardware priority levels. Protected Object ceilings can 110 -- override these values. 111 -- 245 is used by the Interrupt_Manager task 112 -- 0 is reserved for the RTEMS IDLE task 113 114 Max_Priority : constant Positive := 244; 115 Max_Interrupt_Priority : constant Positive := 254; 116 117 subtype Any_Priority is Integer range 1 .. 254; 118 subtype Priority is Any_Priority range 1 .. 244; 119 subtype Interrupt_Priority is Any_Priority range 245 .. 254; 120 121 Default_Priority : constant Priority := 122; 122 123private 124 125 type Address is mod Memory_Size; 126 Null_Address : constant Address := 0; 127 128 -------------------------------------- 129 -- System Implementation Parameters -- 130 -------------------------------------- 131 132 -- These parameters provide information about the target that is used 133 -- by the compiler. They are in the private part of System, where they 134 -- can be accessed using the special circuitry in the Targparm unit 135 -- whose source should be consulted for more detailed descriptions 136 -- of the individual switch values. 137 138 Backend_Divide_Checks : constant Boolean := False; 139 Backend_Overflow_Checks : constant Boolean := True; 140 Command_Line_Args : constant Boolean := True; 141 Configurable_Run_Time : constant Boolean := False; 142 Denorm : constant Boolean := True; 143 Duration_32_Bits : constant Boolean := False; 144 Exit_Status_Supported : constant Boolean := True; 145 Machine_Overflows : constant Boolean := False; 146 Machine_Rounds : constant Boolean := True; 147 Preallocated_Stacks : constant Boolean := False; 148 Signed_Zeros : constant Boolean := True; 149 Stack_Check_Default : constant Boolean := False; 150 Stack_Check_Probes : constant Boolean := False; 151 Stack_Check_Limits : constant Boolean := False; 152 Support_Aggregates : constant Boolean := True; 153 Support_Composite_Assign : constant Boolean := True; 154 Support_Composite_Compare : constant Boolean := True; 155 Support_Long_Shifts : constant Boolean := True; 156 Always_Compatible_Rep : constant Boolean := False; 157 Suppress_Standard_Library : constant Boolean := False; 158 Use_Ada_Main_Program_Name : constant Boolean := False; 159 Frontend_Exceptions : constant Boolean := False; 160 ZCX_By_Default : constant Boolean := True; 161 162end System; 163