File : system-lynxos178-ppc-cert.ads
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT RUN-TIME COMPONENTS --
4 -- --
5 -- S Y S T E M --
6 -- --
7 -- S p e c --
8 -- (LynxOS-178/CERT Version PPC) --
9 -- --
10 -- Copyright (C) 2009-2015, 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 -- --
24 -- --
25 -- --
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 -- Level A certifiable LynxOS-178 version
38
39 pragma Restrictions (No_Finalization);
40 -- Controlled types are not supported in this run time
41
42 pragma 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
47 pragma Restrictions (No_Abort_Statements);
48 -- Abort statements and task abort are not upported in this run time
49
50 pragma Restrictions (No_Implicit_Dynamic_Code);
51 -- Pointers to nested subprograms are not allowed in this run time, in order
52 -- to prevent the compiler from building "trampolines".
53
54 pragma Restrictions (No_Tasking);
55 -- Tasking is not supported in this run time
56
57 pragma Restrictions (Max_Asynchronous_Select_Nesting => 0);
58 -- Asynchronous Transfer of Control is not allowed in this run time
59
60 package System is
61 pragma Pure;
62 -- Note that we take advantage of the implementation permission to make
63 -- this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada
64 -- 2005, this is Pure in any case (AI-362).
65
66 pragma No_Elaboration_Code_All;
67 -- Allow the use of that restriction in units that WITH this unit
68
69 type Name is (SYSTEM_NAME_GNAT);
70 System_Name : constant Name := SYSTEM_NAME_GNAT;
71
72 -- System-Dependent Named Numbers
73
74 Min_Int : constant := Long_Long_Integer'First;
75 Max_Int : constant := Long_Long_Integer'Last;
76
77 Max_Binary_Modulus : constant := 2 ** Long_Long_Integer'Size;
78 Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
79
80 Max_Base_Digits : constant := Long_Long_Float'Digits;
81 Max_Digits : constant := Long_Long_Float'Digits;
82
83 Max_Mantissa : constant := 63;
84 Fine_Delta : constant := 2.0 ** (-Max_Mantissa);
85
86 Tick : constant := 0.01;
87
88 -- Storage-related Declarations
89
90 type Address is private;
91 pragma Preelaborable_Initialization (Address);
92 Null_Address : constant Address;
93
94 Storage_Unit : constant := 8;
95 Word_Size : constant := 32;
96 Memory_Size : constant := 2 ** 32;
97
98 -- Address comparison
99
100 function "<" (Left, Right : Address) return Boolean;
101 function "<=" (Left, Right : Address) return Boolean;
102 function ">" (Left, Right : Address) return Boolean;
103 function ">=" (Left, Right : Address) return Boolean;
104 function "=" (Left, Right : Address) return Boolean;
105
106 pragma Import (Intrinsic, "<");
107 pragma Import (Intrinsic, "<=");
108 pragma Import (Intrinsic, ">");
109 pragma Import (Intrinsic, ">=");
110 pragma Import (Intrinsic, "=");
111
112 -- Other System-Dependent Declarations
113
114 type Bit_Order is (High_Order_First, Low_Order_First);
115 Default_Bit_Order : constant Bit_Order := High_Order_First;
116 pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
117
118 -- Priority-related Declarations (RM D.1)
119
120 -- 17 is the system determined default priority for user applications
121 -- running on LynxOS.
122
123 -- The standard (Rm 13.7) requires that Default_Priority has the value:
124
125 -- (Priority'First + Priority'Last) / 2
126
127 -- However, the default priority given by the OS is not the same thing as
128 -- the Ada value Default_Prioirity (previous examples include VxWorks).
129 -- Therefore, we follow a model based on the full range of LynxOS-178
130 -- priorities.
131
132 Max_Priority : constant Positive := 252;
133 Max_Interrupt_Priority : constant Positive := 255;
134
135 subtype Any_Priority is Integer range 0 .. 255;
136 subtype Priority is Any_Priority range 0 .. 252;
137 subtype Interrupt_Priority is Any_Priority range 253 .. 255;
138
139 Default_Priority : constant Priority := 126;
140
141 -- Note: the priority of the environment task is set externally by the OS
142
143 private
144
145 type Address is mod Memory_Size;
146 Null_Address : constant Address := 0;
147
148 --------------------------------------
149 -- System Implementation Parameters --
150 --------------------------------------
151
152 -- These parameters provide information about the target that is used
153 -- by the compiler. They are in the private part of System, where they
154 -- can be accessed using the special circuitry in the Targparm unit
155 -- whose source should be consulted for more detailed descriptions
156 -- of the individual switch values.
157
158 Backend_Divide_Checks : constant Boolean := False;
159 Backend_Overflow_Checks : constant Boolean := True;
160 Command_Line_Args : constant Boolean := False;
161 Configurable_Run_Time : constant Boolean := True;
162 Denorm : constant Boolean := True;
163 Duration_32_Bits : constant Boolean := False;
164 Exit_Status_Supported : constant Boolean := True;
165 Fractional_Fixed_Ops : constant Boolean := False;
166 Frontend_Layout : constant Boolean := False;
167 Machine_Overflows : constant Boolean := False;
168 Machine_Rounds : constant Boolean := True;
169 Preallocated_Stacks : constant Boolean := False;
170 Signed_Zeros : constant Boolean := True;
171 Stack_Check_Default : constant Boolean := False;
172 Stack_Check_Probes : constant Boolean := True;
173 Stack_Check_Limits : constant Boolean := False;
174 Support_Aggregates : constant Boolean := True;
175 Support_Composite_Assign : constant Boolean := True;
176 Support_Composite_Compare : constant Boolean := True;
177 Support_Long_Shifts : constant Boolean := True;
178 Always_Compatible_Rep : constant Boolean := True;
179 Suppress_Standard_Library : constant Boolean := False;
180 Use_Ada_Main_Program_Name : constant Boolean := False;
181 Frontend_Exceptions : constant Boolean := True;
182 ZCX_By_Default : constant Boolean := False;
183
184 end System;