File : system-xi-sparc-ravenscar.ads
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT RUN-TIME COMPONENTS --
4 -- --
5 -- S Y S T E M --
6 -- --
7 -- S p e c --
8 -- (Sparc/32 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 -- This is a Ravenscar bare board version of this package for SPARC targets
38
39 pragma Restrictions (No_Exception_Propagation);
40 -- Only local exception handling is supported in this profile
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_Implicit_Dynamic_Code);
48 -- Pointers to nested subprograms are not allowed in this run time, in order
49 -- to prevent the compiler from building "trampolines".
50
51 pragma Restrictions (No_Finalization);
52 -- Controlled types are not supported in this run time
53
54 pragma Profile (Ravenscar);
55 -- This is a Ravenscar run time
56
57 pragma Discard_Names;
58 -- Disable explicitly the generation of names associated with entities in
59 -- order to reduce the amount of storage used. These names are not used anyway
60 -- (attributes such as 'Image and 'Value are not supported in this run time).
61
62 package System is
63 pragma Pure;
64 -- Note that we take advantage of the implementation permission to make
65 -- this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada
66 -- 2005, this is Pure in any case (AI-362).
67
68 pragma No_Elaboration_Code_All;
69 -- Allow the use of that restriction in units that WITH this unit
70
71 type Name is (SYSTEM_NAME_GNAT);
72 System_Name : constant Name := SYSTEM_NAME_GNAT;
73
74 -- System-Dependent Named Numbers
75
76 Min_Int : constant := Long_Long_Integer'First;
77 Max_Int : constant := Long_Long_Integer'Last;
78
79 Max_Binary_Modulus : constant := 2 ** Long_Long_Integer'Size;
80 Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
81
82 Max_Base_Digits : constant := Long_Long_Float'Digits;
83 Max_Digits : constant := Long_Long_Float'Digits;
84
85 Max_Mantissa : constant := 63;
86 Fine_Delta : constant := 2.0 ** (-Max_Mantissa);
87
88 Tick : constant := 0.000_001;
89
90 -- Storage-related Declarations
91
92 type Address is private;
93 pragma Preelaborable_Initialization (Address);
94 Null_Address : constant Address;
95
96 Storage_Unit : constant := 8;
97 Word_Size : constant := 32;
98 Memory_Size : constant := 2 ** 32;
99
100 -- Address comparison
101
102 function "<" (Left, Right : Address) return Boolean;
103 function "<=" (Left, Right : Address) return Boolean;
104 function ">" (Left, Right : Address) return Boolean;
105 function ">=" (Left, Right : Address) return Boolean;
106 function "=" (Left, Right : Address) return Boolean;
107
108 pragma Import (Intrinsic, "<");
109 pragma Import (Intrinsic, "<=");
110 pragma Import (Intrinsic, ">");
111 pragma Import (Intrinsic, ">=");
112 pragma Import (Intrinsic, "=");
113
114 -- Other System-Dependent Declarations
115
116 type Bit_Order is (High_Order_First, Low_Order_First);
117 Default_Bit_Order : constant Bit_Order := High_Order_First;
118 pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
119
120 -- Priority-related Declarations (RM D.1)
121
122 -- 241 - 255 correspond to hardware interrupt levels 1 .. 15
123 -- 255 is the priority value that block all interrupts
124 -- 240 is the maximum value of priority that is not high enough to
125 -- require the blocking of one or more interrupts.
126
127 Max_Priority : constant Positive := 240;
128 Max_Interrupt_Priority : constant Positive := 255;
129
130 subtype Any_Priority is Integer range 0 .. 255;
131 subtype Priority is Any_Priority range 0 .. 240;
132 subtype Interrupt_Priority is Any_Priority range 241 .. 255;
133
134 Default_Priority : constant Priority := 120;
135 -- By default, the priority assigned is the one in the middle of the
136 -- Priority range.
137
138 private
139
140 type Address is mod Memory_Size;
141 Null_Address : constant Address := 0;
142
143 --------------------------------------
144 -- System Implementation Parameters --
145 --------------------------------------
146
147 -- These parameters provide information about the target that is used
148 -- by the compiler. They are in the private part of System, where they
149 -- can be accessed using the special circuitry in the Targparm unit
150 -- whose source should be consulted for more detailed descriptions
151 -- of the individual switch values.
152
153 Atomic_Sync_Default : constant Boolean := False;
154 Backend_Divide_Checks : constant Boolean := False;
155 Backend_Overflow_Checks : constant Boolean := True;
156 Command_Line_Args : constant Boolean := False;
157 Configurable_Run_Time : constant Boolean := True;
158 Denorm : constant Boolean := False;
159 Duration_32_Bits : constant Boolean := False;
160 Exit_Status_Supported : constant Boolean := False;
161 Fractional_Fixed_Ops : constant Boolean := False;
162 Frontend_Layout : constant Boolean := False;
163 Machine_Overflows : constant Boolean := False;
164 Machine_Rounds : constant Boolean := True;
165 Preallocated_Stacks : constant Boolean := True;
166 Signed_Zeros : constant Boolean := True;
167 Stack_Check_Default : constant Boolean := False;
168 Stack_Check_Probes : constant Boolean := False;
169 Stack_Check_Limits : constant Boolean := False;
170 Support_Aggregates : constant Boolean := True;
171 Support_Composite_Assign : constant Boolean := True;
172 Support_Composite_Compare : constant Boolean := True;
173 Support_Long_Shifts : constant Boolean := True;
174 Always_Compatible_Rep : constant Boolean := True;
175 Suppress_Standard_Library : constant Boolean := True;
176 Use_Ada_Main_Program_Name : constant Boolean := False;
177 Frontend_Exceptions : constant Boolean := False;
178 ZCX_By_Default : constant Boolean := True;
179
180 -- On bare board targets, the linking step requires special options to
181 -- be passed to specify the linker script and libraries to be linked
182 -- against. The following option specifies additional specs for the GCC
183 -- driver that accomplish that.
184
185 pragma Linker_Options ("--specs=leon.specs");
186 end System;