File : system-xi-ppc-full.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) 1992-2015, 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 pragma Restrictions (No_Exception_Registration);
38 -- Disable exception name registration. This capability is not used because
39 -- it is only required by exception stream attributes which are not supported
40 -- in this run time.
41
42 pragma Profile (GNAT_Extended_Ravenscar);
43 -- This is a Ravenscar run time
44
45 package System is
46 pragma Pure;
47 -- Note that we take advantage of the implementation permission to make
48 -- this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada
49 -- 2005, this is Pure in any case (AI-362).
50
51 pragma No_Elaboration_Code_All;
52 -- Allow the use of that restriction in units that WITH this unit
53
54 type Name is (SYSTEM_NAME_GNAT);
55 System_Name : constant Name := SYSTEM_NAME_GNAT;
56
57 -- System-Dependent Named Numbers
58
59 Min_Int : constant := Long_Long_Integer'First;
60 Max_Int : constant := Long_Long_Integer'Last;
61
62 Max_Binary_Modulus : constant := 2 ** Long_Long_Integer'Size;
63 Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
64
65 Max_Base_Digits : constant := Long_Long_Float'Digits;
66 Max_Digits : constant := Long_Long_Float'Digits;
67
68 Max_Mantissa : constant := 63;
69 Fine_Delta : constant := 2.0 ** (-Max_Mantissa);
70
71 Tick : constant := 0.000_001;
72
73 -- Storage-related Declarations
74
75 type Address is private;
76 pragma Preelaborable_Initialization (Address);
77 Null_Address : constant Address;
78
79 Storage_Unit : constant := 8;
80 Word_Size : constant := 32;
81 Memory_Size : constant := 2 ** 32;
82
83 -- Address comparison
84
85 function "<" (Left, Right : Address) return Boolean;
86 function "<=" (Left, Right : Address) return Boolean;
87 function ">" (Left, Right : Address) return Boolean;
88 function ">=" (Left, Right : Address) return Boolean;
89 function "=" (Left, Right : Address) return Boolean;
90
91 pragma Import (Intrinsic, "<");
92 pragma Import (Intrinsic, "<=");
93 pragma Import (Intrinsic, ">");
94 pragma Import (Intrinsic, ">=");
95 pragma Import (Intrinsic, "=");
96
97 -- Other System-Dependent Declarations
98
99 type Bit_Order is (High_Order_First, Low_Order_First);
100 Default_Bit_Order : constant Bit_Order := High_Order_First;
101 pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
102
103 -- Priority-related Declarations (RM D.1)
104
105 -- The OpenPIC has 16 interrupt priority levels, plus 1 for the decrementer
106 Nbr_Interrupt_Priorities : constant Positive := 17;
107 Max_Interrupt_Priority : constant Positive := 255;
108 Max_Priority : constant Positive :=
109 Max_Interrupt_Priority - Nbr_Interrupt_Priorities;
110
111 subtype Any_Priority is Integer
112 range 0 .. Max_Interrupt_Priority;
113 subtype Priority is Any_Priority
114 range 0 .. Max_Priority;
115 subtype Interrupt_Priority is Any_Priority
116 range Priority'Last + 1 .. Any_Priority'Last;
117
118 Default_Priority : constant Priority :=
119 (Priority'Last - Priority'First) / 2;
120
121 private
122
123 type Address is mod Memory_Size;
124 Null_Address : constant Address := 0;
125
126 --------------------------------------
127 -- System Implementation Parameters --
128 --------------------------------------
129
130 -- These parameters provide information about the target that is used
131 -- by the compiler. They are in the private part of System, where they
132 -- can be accessed using the special circuitry in the Targparm unit
133 -- whose source should be consulted for more detailed descriptions
134 -- of the individual switch values.
135
136 Atomic_Sync_Default : constant Boolean := False;
137 Backend_Divide_Checks : constant Boolean := False;
138 Backend_Overflow_Checks : constant Boolean := True;
139 Command_Line_Args : constant Boolean := False;
140 Configurable_Run_Time : constant Boolean := True;
141 Denorm : constant Boolean := True;
142 Duration_32_Bits : constant Boolean := False;
143 Exit_Status_Supported : constant Boolean := False;
144 Fractional_Fixed_Ops : constant Boolean := False;
145 Frontend_Layout : constant Boolean := False;
146 Machine_Overflows : constant Boolean := False;
147 Machine_Rounds : constant Boolean := True;
148 Preallocated_Stacks : constant Boolean := True;
149 Signed_Zeros : constant Boolean := True;
150 Stack_Check_Default : constant Boolean := False;
151 Stack_Check_Probes : constant Boolean := False;
152 Stack_Check_Limits : constant Boolean := False;
153 Support_Aggregates : 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 := True;
158 Suppress_Standard_Library : constant Boolean := False;
159 Use_Ada_Main_Program_Name : constant Boolean := False;
160 Frontend_Exceptions : constant Boolean := False;
161 ZCX_By_Default : constant Boolean := True;
162
163 end System;