File : system-xi-cortexm4-full.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) 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 pragma Restrictions (No_Task_At_Interrupt_Priority);
46 -- On Cortex-M, it is not possible to have tasks at Interrupt_Priority, as
47 -- the context switch is triggered by the Pend_SV interrupt, which is at
48 -- lowest priority.
49
50 package System is
51 pragma Pure;
52 -- Note that we take advantage of the implementation permission to make
53 -- this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada
54 -- 2005, this is Pure in any case (AI-362).
55
56 pragma No_Elaboration_Code_All;
57 -- Allow the use of that restriction in units that WITH this unit
58
59 type Name is (SYSTEM_NAME_GNAT);
60 System_Name : constant Name := SYSTEM_NAME_GNAT;
61
62 -- System-Dependent Named Numbers
63
64 Min_Int : constant := Long_Long_Integer'First;
65 Max_Int : constant := Long_Long_Integer'Last;
66
67 Max_Binary_Modulus : constant := 2 ** Long_Long_Integer'Size;
68 Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
69
70 Max_Base_Digits : constant := Long_Long_Float'Digits;
71 Max_Digits : constant := Long_Long_Float'Digits;
72
73 Max_Mantissa : constant := 63;
74 Fine_Delta : constant := 2.0 ** (-Max_Mantissa);
75
76 Tick : constant := 0.000_001;
77
78 -- Storage-related Declarations
79
80 type Address is private;
81 pragma Preelaborable_Initialization (Address);
82 Null_Address : constant Address;
83
84 Storage_Unit : constant := 8;
85 Word_Size : constant := 32;
86 Memory_Size : constant := 2 ** 32;
87
88 -- Address comparison
89
90 function "<" (Left, Right : Address) return Boolean;
91 function "<=" (Left, Right : Address) return Boolean;
92 function ">" (Left, Right : Address) return Boolean;
93 function ">=" (Left, Right : Address) return Boolean;
94 function "=" (Left, Right : Address) return Boolean;
95
96 pragma Import (Intrinsic, "<");
97 pragma Import (Intrinsic, "<=");
98 pragma Import (Intrinsic, ">");
99 pragma Import (Intrinsic, ">=");
100 pragma Import (Intrinsic, "=");
101
102 -- Other System-Dependent Declarations
103
104 type Bit_Order is (High_Order_First, Low_Order_First);
105 Default_Bit_Order : constant Bit_Order :=
106 Bit_Order'Val (Standard'Default_Bit_Order);
107 pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
108
109 -- Priority-related Declarations (RM D.1)
110
111 -- 241 .. 255 corresponds to priority level 15 .. 1
112
113 Max_Interrupt_Priority : constant Positive := 255;
114 Max_Priority : constant Positive := 240;
115
116 subtype Any_Priority is Integer range 0 .. 255;
117 subtype Priority is Any_Priority range 0 .. 240;
118 subtype Interrupt_Priority is Any_Priority range 241 .. 255;
119
120 Default_Priority : constant Priority := 120;
121
122 private
123
124 type Address is mod Memory_Size;
125 Null_Address : constant Address := 0;
126
127 --------------------------------------
128 -- System Implementation Parameters --
129 --------------------------------------
130
131 -- These parameters provide information about the target that is used by
132 -- the compiler. They are in the private part of System, where they can be
133 -- accessed using the special circuitry in the Targparm unit whose source
134 -- should be consulted for more detailed descriptions of the individual
135 -- switch values.
136
137 Atomic_Sync_Default : constant Boolean := False;
138 Backend_Divide_Checks : constant Boolean := False;
139 Backend_Overflow_Checks : constant Boolean := True;
140 Command_Line_Args : constant Boolean := False;
141 Configurable_Run_Time : constant Boolean := True;
142 Denorm : constant Boolean := False;
143 Duration_32_Bits : constant Boolean := False;
144 Exit_Status_Supported : constant Boolean := False;
145 Fractional_Fixed_Ops : constant Boolean := False;
146 Frontend_Layout : constant Boolean := False;
147 Machine_Overflows : constant Boolean := False;
148 Machine_Rounds : constant Boolean := True;
149 Preallocated_Stacks : constant Boolean := True;
150 Signed_Zeros : constant Boolean := True;
151 Stack_Check_Default : constant Boolean := False;
152 Stack_Check_Probes : constant Boolean := False;
153 Stack_Check_Limits : constant Boolean := False;
154 Support_Aggregates : constant Boolean := True;
155 Support_Composite_Assign : constant Boolean := True;
156 Support_Composite_Compare : constant Boolean := True;
157 Support_Long_Shifts : constant Boolean := True;
158 Always_Compatible_Rep : constant Boolean := True;
159 Suppress_Standard_Library : constant Boolean := False;
160 Use_Ada_Main_Program_Name : constant Boolean := False;
161 Frontend_Exceptions : constant Boolean := False;
162 ZCX_By_Default : constant Boolean := True;
163
164 end System;