1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME COMPONENTS --
8 -- (Compiler Version) --
10 -- Copyright (C) 1992-2023, Free Software Foundation, Inc. --
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. --
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. --
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. --
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/>. --
32 -- GNAT was originally developed by the GNAT team at New York University. --
33 -- Extensive contributions were provided by Ada Core Technologies Inc. --
35 ------------------------------------------------------------------------------
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
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).
47 pragma No_Elaboration_Code_All
;
48 -- Allow the use of that restriction in units that WITH this unit
50 type Name
is (SYSTEM_NAME_GNAT
);
51 System_Name
: constant Name
:= SYSTEM_NAME_GNAT
;
53 -- System-Dependent Named Numbers
55 Min_Int
: constant := -2 ** (Standard
'Max_Integer_Size - 1);
56 Max_Int
: constant := 2 ** (Standard
'Max_Integer_Size - 1) - 1;
58 Max_Binary_Modulus
: constant := 2 ** Standard
'Max_Integer_Size;
59 Max_Nonbinary_Modulus
: constant := 2 ** Integer'Size - 1;
61 Max_Base_Digits
: constant := Long_Long_Float'Digits;
62 Max_Digits
: constant := Long_Long_Float'Digits;
64 Max_Mantissa
: constant := Standard
'Max_Integer_Size - 1;
65 Fine_Delta
: constant := 2.0 ** (-Max_Mantissa
);
67 Tick
: constant := 0.01;
69 -- Storage-related Declarations
71 type Address
is private;
72 pragma Preelaborable_Initialization
(Address
);
73 Null_Address
: constant Address
;
75 Storage_Unit
: constant := Standard
'Storage_Unit;
76 Word_Size
: constant := Standard
'Word_Size;
77 Memory_Size
: constant := 2 ** Standard
'Address_Size;
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;
87 pragma Import
(Intrinsic
, "<");
88 pragma Import
(Intrinsic
, "<=");
89 pragma Import
(Intrinsic
, ">");
90 pragma Import
(Intrinsic
, ">=");
91 pragma Import
(Intrinsic
, "=");
93 -- Other System-Dependent Declarations
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
100 -- Priority-related Declarations (RM D.1)
102 -- RTEMS POSIX threads support 256 priority levels with 255 being
103 -- logically the most important. Levels 0 and 255 are reserved.
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
114 Max_Priority
: constant Positive := 244;
115 Max_Interrupt_Priority
: constant Positive := 254;
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;
121 Default_Priority
: constant Priority
:= 122;
125 type Address
is mod Memory_Size
;
126 Null_Address
: constant Address
:= 0;
128 --------------------------------------
129 -- System Implementation Parameters --
130 --------------------------------------
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.
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_Atomic_Primitives
: constant Boolean := True;
154 Support_Composite_Assign
: constant Boolean := True;
155 Support_Composite_Compare
: constant Boolean := True;
156 Support_Long_Shifts
: constant Boolean := True;
157 Always_Compatible_Rep
: constant Boolean := False;
158 Suppress_Standard_Library
: constant Boolean := False;
159 Use_Ada_Main_Program_Name
: constant Boolean := False;
160 ZCX_By_Default
: constant Boolean := True;