File : system-xi-ppc-minimal.ads
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT RUN-TIME COMPONENTS --
4 -- --
5 -- S Y S T E M --
6 -- --
7 -- S p e c --
8 -- (PPC ELF 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 -- --
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 pragma Restrictions (No_Exception_Propagation);
38 -- Only local exception handling is supported in this profile
39
40 pragma Restrictions (No_Exception_Registration);
41 -- Disable exception name registration. This capability is not used because
42 -- it is only required by exception stream attributes which are not supported
43 -- in this run time.
44
45 pragma Restrictions (No_Implicit_Dynamic_Code);
46 -- Pointers to nested subprograms are not allowed in this run time, in order
47 -- to prevent the compiler from building "trampolines".
48
49 pragma Restrictions (No_Finalization);
50 -- Controlled types are not supported in this run time
51
52 pragma Profile (Ravenscar);
53 -- This is a Ravenscar run time
54
55 package System is
56 pragma Pure;
57 -- Note that we take advantage of the implementation permission to make
58 -- this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada
59 -- 2005, this is Pure in any case (AI-362).
60
61 pragma No_Elaboration_Code_All;
62 -- Allow the use of that restriction in units that WITH this unit
63
64 type Name is (SYSTEM_NAME_GNAT);
65 System_Name : constant Name := SYSTEM_NAME_GNAT;
66
67 -- System-Dependent Named Numbers
68
69 Min_Int : constant := Long_Long_Integer'First;
70 Max_Int : constant := Long_Long_Integer'Last;
71
72 Max_Binary_Modulus : constant := 2 ** Long_Long_Integer'Size;
73 Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
74
75 Max_Base_Digits : constant := Long_Long_Float'Digits;
76 Max_Digits : constant := Long_Long_Float'Digits;
77
78 Max_Mantissa : constant := 63;
79 Fine_Delta : constant := 2.0 ** (-Max_Mantissa);
80
81 Tick : constant := 0.000_001;
82
83 -- Storage-related Declarations
84
85 type Address is private;
86 pragma Preelaborable_Initialization (Address);
87 Null_Address : constant Address;
88
89 Storage_Unit : constant := 8;
90 Word_Size : constant := 32;
91 Memory_Size : constant := 2 ** 32;
92
93 -- Address comparison
94
95 function "<" (Left, Right : Address) return Boolean;
96 function "<=" (Left, Right : Address) return Boolean;
97 function ">" (Left, Right : Address) return Boolean;
98 function ">=" (Left, Right : Address) return Boolean;
99 function "=" (Left, Right : Address) return Boolean;
100
101 pragma Import (Intrinsic, "<");
102 pragma Import (Intrinsic, "<=");
103 pragma Import (Intrinsic, ">");
104 pragma Import (Intrinsic, ">=");
105 pragma Import (Intrinsic, "=");
106
107 -- Other System-Dependent Declarations
108
109 type Bit_Order is (High_Order_First, Low_Order_First);
110 Default_Bit_Order : constant Bit_Order := High_Order_First;
111 pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
112
113 -- Priority-related Declarations (RM D.1)
114
115 Nbr_Interrupt_Priorities : constant Positive := 8;
116 Max_Interrupt_Priority : constant Positive := 255;
117 Max_Priority : constant Positive :=
118 Max_Interrupt_Priority - Nbr_Interrupt_Priorities;
119
120 subtype Any_Priority is Integer
121 range 0 .. Max_Interrupt_Priority;
122 subtype Priority is Any_Priority
123 range 0 .. Max_Priority;
124 subtype Interrupt_Priority is Any_Priority
125 range Priority'Last + 1 .. Any_Priority'Last;
126
127 Default_Priority : constant Priority :=
128 (Priority'Last - Priority'First) / 2;
129
130 private
131
132 type Address is mod Memory_Size;
133 Null_Address : constant Address := 0;
134
135 --------------------------------------
136 -- System Implementation Parameters --
137 --------------------------------------
138
139 -- These parameters provide information about the target that is used
140 -- by the compiler. They are in the private part of System, where they
141 -- can be accessed using the special circuitry in the Targparm unit
142 -- whose source should be consulted for more detailed descriptions
143 -- of the individual switch values.
144
145 Atomic_Sync_Default : constant Boolean := False;
146 Backend_Divide_Checks : constant Boolean := False;
147 Backend_Overflow_Checks : constant Boolean := True;
148 Command_Line_Args : constant Boolean := False;
149 Configurable_Run_Time : constant Boolean := True;
150 Denorm : constant Boolean := True;
151 Duration_32_Bits : constant Boolean := False;
152 Exit_Status_Supported : constant Boolean := False;
153 Fractional_Fixed_Ops : constant Boolean := False;
154 Frontend_Layout : constant Boolean := False;
155 Machine_Overflows : constant Boolean := False;
156 Machine_Rounds : constant Boolean := True;
157 Preallocated_Stacks : constant Boolean := True;
158 Signed_Zeros : constant Boolean := True;
159 Stack_Check_Default : constant Boolean := False;
160 Stack_Check_Probes : constant Boolean := False;
161 Stack_Check_Limits : constant Boolean := False;
162 Support_Aggregates : constant Boolean := True;
163 Support_Composite_Assign : constant Boolean := True;
164 Support_Composite_Compare : constant Boolean := True;
165 Support_Long_Shifts : constant Boolean := True;
166 Always_Compatible_Rep : constant Boolean := True;
167 Suppress_Standard_Library : constant Boolean := True;
168 Use_Ada_Main_Program_Name : constant Boolean := False;
169 Frontend_Exceptions : constant Boolean := False;
170 ZCX_By_Default : constant Boolean := True;
171
172 end System;