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) 1992-2016 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 := Long_Long_Integer'First; 56 Max_Int : constant := Long_Long_Integer'Last; 57 58 Max_Binary_Modulus : constant := 2 ** Long_Long_Integer'Size; 59 Max_Nonbinary_Modulus : constant := Integer'Last; 60 61 Max_Base_Digits : constant := Long_Long_Float'Digits; 62 Max_Digits : constant := Long_Long_Float'Digits; 63 64 Max_Mantissa : constant := 63; 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 and really should not 113 -- be accessible from Ada but GNAT initializes 114 -- Current_Priority to 0 so it must be valid 115 116 Max_Priority : constant Positive := 244; 117 Max_Interrupt_Priority : constant Positive := 254; 118 119 subtype Any_Priority is Integer range 0 .. 254; 120 subtype Priority is Any_Priority range 0 .. 244; 121 subtype Interrupt_Priority is Any_Priority range 245 .. 254; 122 123 Default_Priority : constant Priority := 122; 124 125private 126 127 type Address is mod Memory_Size; 128 Null_Address : constant Address := 0; 129 130 -------------------------------------- 131 -- System Implementation Parameters -- 132 -------------------------------------- 133 134 -- These parameters provide information about the target that is used 135 -- by the compiler. They are in the private part of System, where they 136 -- can be accessed using the special circuitry in the Targparm unit 137 -- whose source should be consulted for more detailed descriptions 138 -- of the individual switch values. 139 140 Backend_Divide_Checks : constant Boolean := False; 141 Backend_Overflow_Checks : constant Boolean := True; 142 Command_Line_Args : constant Boolean := True; 143 Configurable_Run_Time : constant Boolean := False; 144 Denorm : constant Boolean := True; 145 Duration_32_Bits : constant Boolean := False; 146 Exit_Status_Supported : constant Boolean := True; 147 Fractional_Fixed_Ops : constant Boolean := False; 148 Frontend_Layout : constant Boolean := False; 149 Machine_Overflows : constant Boolean := False; 150 Machine_Rounds : constant Boolean := True; 151 Preallocated_Stacks : constant Boolean := False; 152 Signed_Zeros : constant Boolean := True; 153 Stack_Check_Default : constant Boolean := False; 154 Stack_Check_Probes : constant Boolean := False; 155 Stack_Check_Limits : constant Boolean := False; 156 Support_Aggregates : constant Boolean := True; 157 Support_Composite_Assign : constant Boolean := True; 158 Support_Composite_Compare : constant Boolean := True; 159 Support_Long_Shifts : constant Boolean := True; 160 Always_Compatible_Rep : constant Boolean := False; 161 Suppress_Standard_Library : constant Boolean := False; 162 Use_Ada_Main_Program_Name : constant Boolean := False; 163 Frontend_Exceptions : constant Boolean := True; 164 ZCX_By_Default : constant Boolean := False; 165 166end System; 167