File : system-xi-cortexm4-sfp.ads
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT RUN-TIME COMPONENTS --
4 -- --
5 -- S Y S T E M --
6 -- --
7 -- S p e c --
8 -- (ARM Cortex M4 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 pragma Restrictions (No_Task_At_Interrupt_Priority);
56 -- On Cortex-M, it is not possible to have tasks at Interrupt_Priority, as
57 -- the context switch is triggered by the Pend_SV interrupt, which is at
58 -- lowest priority.
59
60 pragma Discard_Names;
61 -- Disable explicitly the generation of names associated with entities in
62 -- order to reduce the amount of storage used. These names are not used anyway
63 -- (attributes such as 'Image and 'Value are not supported in this run time).
64
65 package System is
66 pragma Pure;
67 -- Note that we take advantage of the implementation permission to make
68 -- this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada
69 -- 2005, this is Pure in any case (AI-362).
70
71 pragma No_Elaboration_Code_All;
72 -- Allow the use of that restriction in units that WITH this unit
73
74 type Name is (SYSTEM_NAME_GNAT);
75 System_Name : constant Name := SYSTEM_NAME_GNAT;
76
77 -- System-Dependent Named Numbers
78
79 Min_Int : constant := Long_Long_Integer'First;
80 Max_Int : constant := Long_Long_Integer'Last;
81
82 Max_Binary_Modulus : constant := 2 ** Long_Long_Integer'Size;
83 Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
84
85 Max_Base_Digits : constant := Long_Long_Float'Digits;
86 Max_Digits : constant := Long_Long_Float'Digits;
87
88 Max_Mantissa : constant := 63;
89 Fine_Delta : constant := 2.0 ** (-Max_Mantissa);
90
91 Tick : constant := 0.000_001;
92
93 -- Storage-related Declarations
94
95 type Address is private;
96 pragma Preelaborable_Initialization (Address);
97 Null_Address : constant Address;
98
99 Storage_Unit : constant := 8;
100 Word_Size : constant := 32;
101 Memory_Size : constant := 2 ** 32;
102
103 -- Address comparison
104
105 function "<" (Left, Right : Address) return Boolean;
106 function "<=" (Left, Right : Address) return Boolean;
107 function ">" (Left, Right : Address) return Boolean;
108 function ">=" (Left, Right : Address) return Boolean;
109 function "=" (Left, Right : Address) return Boolean;
110
111 pragma Import (Intrinsic, "<");
112 pragma Import (Intrinsic, "<=");
113 pragma Import (Intrinsic, ">");
114 pragma Import (Intrinsic, ">=");
115 pragma Import (Intrinsic, "=");
116
117 -- Other System-Dependent Declarations
118
119 type Bit_Order is (High_Order_First, Low_Order_First);
120 Default_Bit_Order : constant Bit_Order :=
121 Bit_Order'Val (Standard'Default_Bit_Order);
122 pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
123
124 -- Priority-related Declarations (RM D.1)
125
126 -- 241 .. 255 corresponds to priority level 15 .. 1
127
128 Max_Interrupt_Priority : constant Positive := 255;
129 Max_Priority : constant Positive := 240;
130
131 subtype Any_Priority is Integer range 0 .. 255;
132 subtype Priority is Any_Priority range 0 .. 240;
133 subtype Interrupt_Priority is Any_Priority range 241 .. 255;
134
135 Default_Priority : constant Priority := 120;
136
137 private
138
139 type Address is mod Memory_Size;
140 Null_Address : constant Address := 0;
141
142 --------------------------------------
143 -- System Implementation Parameters --
144 --------------------------------------
145
146 -- These parameters provide information about the target that is used by
147 -- the compiler. They are in the private part of System, where they can be
148 -- accessed using the special circuitry in the Targparm unit whose source
149 -- should be consulted for more detailed descriptions of the individual
150 -- switch values.
151
152 Atomic_Sync_Default : constant Boolean := False;
153 Backend_Divide_Checks : constant Boolean := False;
154 Backend_Overflow_Checks : constant Boolean := True;
155 Command_Line_Args : constant Boolean := False;
156 Configurable_Run_Time : constant Boolean := True;
157 Denorm : constant Boolean := False;
158 Duration_32_Bits : constant Boolean := False;
159 Exit_Status_Supported : constant Boolean := False;
160 Fractional_Fixed_Ops : constant Boolean := False;
161 Frontend_Layout : constant Boolean := False;
162 Machine_Overflows : constant Boolean := False;
163 Machine_Rounds : constant Boolean := True;
164 Preallocated_Stacks : constant Boolean := True;
165 Signed_Zeros : constant Boolean := True;
166 Stack_Check_Default : constant Boolean := False;
167 Stack_Check_Probes : constant Boolean := False;
168 Stack_Check_Limits : constant Boolean := False;
169 Support_Aggregates : constant Boolean := True;
170 Support_Composite_Assign : constant Boolean := True;
171 Support_Composite_Compare : constant Boolean := True;
172 Support_Long_Shifts : constant Boolean := True;
173 Always_Compatible_Rep : constant Boolean := True;
174 Suppress_Standard_Library : constant Boolean := True;
175 Use_Ada_Main_Program_Name : constant Boolean := False;
176 Frontend_Exceptions : constant Boolean := False;
177 ZCX_By_Default : constant Boolean := True;
178
179 end System;