1------------------------------------------------------------------------------
2--                                                                          --
3--                        GNAT RUN-TIME COMPONENTS                          --
4--                                                                          --
5--                               S Y S T E M                                --
6--                                                                          --
7--                                 S p e c                                  --
8--                          (VxWorks 6.x ARM RTP)                           --
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-- In particular,  you can freely  distribute your programs  built with the --
28-- GNAT Pro compiler, including any required library run-time units,  using --
29-- any licensing terms  of your choosing.  See the AdaCore Software License --
30-- for full details.                                                        --
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 the VxWorks version of this package for RTPs
38
39package System is
40   pragma Pure;
41   --  Note that we take advantage of the implementation permission to make
42   --  this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada
43   --  2005, this is Pure in any case (AI-362).
44
45   pragma No_Elaboration_Code_All;
46   --  Allow the use of that restriction in units that WITH this unit
47
48   type Name is (SYSTEM_NAME_GNAT);
49   System_Name : constant Name := SYSTEM_NAME_GNAT;
50
51   --  System-Dependent Named Numbers
52
53   Min_Int               : constant := Long_Long_Integer'First;
54   Max_Int               : constant := Long_Long_Integer'Last;
55
56   Max_Binary_Modulus    : constant := 2 ** Long_Long_Integer'Size;
57   Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
58
59   Max_Base_Digits       : constant := Long_Long_Float'Digits;
60   Max_Digits            : constant := Long_Long_Float'Digits;
61
62   Max_Mantissa          : constant := 63;
63   Fine_Delta            : constant := 2.0 ** (-Max_Mantissa);
64
65   Tick                  : constant := 1.0 / 60.0;
66
67   --  Storage-related Declarations
68
69   type Address is private;
70   pragma Preelaborable_Initialization (Address);
71   Null_Address : constant Address;
72
73   Storage_Unit : constant := 8;
74   Word_Size    : constant := 32;
75   Memory_Size  : constant := 2 ** 32;
76
77   --  Address comparison
78
79   function "<"  (Left, Right : Address) return Boolean;
80   function "<=" (Left, Right : Address) return Boolean;
81   function ">"  (Left, Right : Address) return Boolean;
82   function ">=" (Left, Right : Address) return Boolean;
83   function "="  (Left, Right : Address) return Boolean;
84
85   pragma Import (Intrinsic, "<");
86   pragma Import (Intrinsic, "<=");
87   pragma Import (Intrinsic, ">");
88   pragma Import (Intrinsic, ">=");
89   pragma Import (Intrinsic, "=");
90
91   --  Other System-Dependent Declarations
92
93   type Bit_Order is (High_Order_First, Low_Order_First);
94   Default_Bit_Order : constant Bit_Order := Low_Order_First;
95   pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
96
97   --  Priority-related Declarations (RM D.1)
98
99   --  Ada priorities are mapped to VxWorks priorities using the following
100   --  transformation: 255 - Ada Priority
101
102   --  Ada priorities are used as follows:
103
104   --  256        is reserved for the VxWorks kernel
105   --  248 - 255  correspond to hardware interrupt levels 0 .. 7
106   --  247        is a catchall default "interrupt" priority for signals,
107   --             allowing higher priority than normal tasks, but lower than
108   --             hardware priority levels.  Protected Object ceilings can
109   --             override these values.
110   --  246        is used by the Interrupt_Manager task
111
112   Max_Priority           : constant Positive := 245;
113   Max_Interrupt_Priority : constant Positive := 255;
114
115   subtype Any_Priority       is Integer      range   0 .. 255;
116   subtype Priority           is Any_Priority range   0 .. 245;
117   subtype Interrupt_Priority is Any_Priority range 246 .. 255;
118
119   Default_Priority : constant Priority := 122;
120
121private
122
123   pragma Linker_Options ("--specs=vxworks-gnat-crtbe-link.spec");
124   --  Pull in crtbegin/crtend objects and register exceptions for ZCX.
125   --  This is commented out by our Makefile for SJLJ runtimes.
126
127   pragma Linker_Options ("--specs=vxworks-smp-arm-link.spec");
128   pragma Linker_Options ("--specs=vxworks-arm-link.spec");
129   --  Setup proper set of -L's for this configuration
130
131   type Address is mod Memory_Size;
132   Null_Address : constant Address := 0;
133
134   --------------------------------------
135   -- System Implementation Parameters --
136   --------------------------------------
137
138   --  These parameters provide information about the target that is used
139   --  by the compiler. They are in the private part of System, where they
140   --  can be accessed using the special circuitry in the Targparm unit
141   --  whose source should be consulted for more detailed descriptions
142   --  of the individual switch values.
143
144   Backend_Divide_Checks     : constant Boolean := False;
145   Backend_Overflow_Checks   : constant Boolean := True;
146   Command_Line_Args         : constant Boolean := True;
147   Configurable_Run_Time     : constant Boolean := False;
148   Denorm                    : constant Boolean := True;
149   Duration_32_Bits          : constant Boolean := False;
150   Exit_Status_Supported     : constant Boolean := True;
151   Fractional_Fixed_Ops      : constant Boolean := False;
152   Frontend_Layout           : constant Boolean := False;
153   Machine_Overflows         : constant Boolean := False;
154   Machine_Rounds            : constant Boolean := True;
155   Preallocated_Stacks       : constant Boolean := False;
156   Signed_Zeros              : constant Boolean := True;
157   Stack_Check_Default       : constant Boolean := False;
158   Stack_Check_Probes        : constant Boolean := True;
159   Stack_Check_Limits        : constant Boolean := False;
160   Support_Aggregates        : constant Boolean := True;
161   Support_Composite_Assign  : constant Boolean := True;
162   Support_Composite_Compare : constant Boolean := True;
163   Support_Long_Shifts       : constant Boolean := True;
164   Always_Compatible_Rep     : constant Boolean := False;
165   Suppress_Standard_Library : constant Boolean := False;
166   Use_Ada_Main_Program_Name : constant Boolean := False;
167   Frontend_Exceptions       : constant Boolean := False;
168   ZCX_By_Default            : constant Boolean := True;
169
170   Executable_Extension : constant String := ".vxe";
171
172end System;
173