File : system-pikeos-ppc-ravenscar-full.ads
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT RUN-TIME COMPONENTS --
4 -- --
5 -- S Y S T E M --
6 -- --
7 -- S p e c --
8 -- (PikeOS PPC 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 version of this package for PowerPC PikeOS targets
38
39 pragma Restrictions (No_Exception_Registration);
40 -- Disable exception name registration. This capability is not used because
41 -- it is only required by exception stream attributes which are not supported
42 -- in this run time.
43
44 pragma Profile (GNAT_Extended_Ravenscar);
45 -- This is a Ravenscar run time
46
47 package System is
48 pragma Pure;
49 -- Note that we take advantage of the implementation permission to make
50 -- this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada
51 -- 2005, this is Pure in any case (AI-362).
52
53 pragma No_Elaboration_Code_All;
54 -- Allow the use of that restriction in units that WITH this unit
55
56 type Name is (SYSTEM_NAME_GNAT);
57 System_Name : constant Name := SYSTEM_NAME_GNAT;
58
59 -- System-Dependent Named Numbers
60
61 Min_Int : constant := Long_Long_Integer'First;
62 Max_Int : constant := Long_Long_Integer'Last;
63
64 Max_Binary_Modulus : constant := 2 ** Long_Long_Integer'Size;
65 Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
66
67 Max_Base_Digits : constant := Long_Long_Float'Digits;
68 Max_Digits : constant := Long_Long_Float'Digits;
69
70 Max_Mantissa : constant := 63;
71 Fine_Delta : constant := 2.0 ** (-Max_Mantissa);
72
73 Tick : constant := 0.000_000_001; -- 1 ns
74
75 -- Storage-related Declarations
76
77 type Address is private;
78 pragma Preelaborable_Initialization (Address);
79 Null_Address : constant Address;
80
81 Storage_Unit : constant := 8;
82 Word_Size : constant := 32;
83 Memory_Size : constant := 2 ** 32;
84
85 -- Address comparison
86
87 function "<" (Left, Right : Address) return Boolean;
88 function "<=" (Left, Right : Address) return Boolean;
89 function ">" (Left, Right : Address) return Boolean;
90 function ">=" (Left, Right : Address) return Boolean;
91 function "=" (Left, Right : Address) return Boolean;
92
93 pragma Import (Intrinsic, "<");
94 pragma Import (Intrinsic, "<=");
95 pragma Import (Intrinsic, ">");
96 pragma Import (Intrinsic, ">=");
97 pragma Import (Intrinsic, "=");
98
99 -- Other System-Dependent Declarations
100
101 type Bit_Order is (High_Order_First, Low_Order_First);
102 Default_Bit_Order : constant Bit_Order := High_Order_First;
103 pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
104
105 -- Priority-related Declarations (RM D.1)
106
107 -- For simplicity there is a 1-1 correspondence between Ada and PikeOS
108 -- priorities. PikeOS priority 0 is reserved by the idle thread, so not
109 -- available to Ada.
110
111 -- PikeOS priorities are 0 .. 255
112
113 -- Priorities greather than 245 are reserved to the system software (PSSW)
114
115 -- This implementation reserves priorities 224-239 to interrupts
116
117 -- Priorities 240-245 are reserved to HM and PikeOS exception handlers
118
119 Max_Priority : constant Positive := 223;
120 Max_Interrupt_Priority : constant Positive := 239;
121
122 subtype Any_Priority is Integer range 1 .. Max_Interrupt_Priority;
123 subtype Priority is Any_Priority
124 range Any_Priority'First .. Max_Priority;
125 subtype Interrupt_Priority is Any_Priority
126 range Priority'Last + 1 .. Any_Priority'Last;
127
128 Default_Priority : constant Priority :=
129 (Priority'First + Priority'Last) / 2;
130
131 private
132
133 type Address is mod Memory_Size;
134 Null_Address : constant Address := 0;
135
136 --------------------------------------
137 -- System Implementation Parameters --
138 --------------------------------------
139
140 -- These parameters provide information about the target that is used
141 -- by the compiler. They are in the private part of System, where they
142 -- can be accessed using the special circuitry in the Targparm unit
143 -- whose source should be consulted for more detailed descriptions
144 -- of the individual switch values.
145
146 Atomic_Sync_Default : constant Boolean := False;
147 Backend_Divide_Checks : constant Boolean := False;
148 Backend_Overflow_Checks : constant Boolean := True;
149 Command_Line_Args : constant Boolean := False;
150 Configurable_Run_Time : constant Boolean := True;
151 Denorm : constant Boolean := True;
152 Duration_32_Bits : constant Boolean := False;
153 Exit_Status_Supported : constant Boolean := False;
154 Fractional_Fixed_Ops : constant Boolean := False;
155 Frontend_Layout : constant Boolean := False;
156 Machine_Overflows : constant Boolean := False;
157 Machine_Rounds : constant Boolean := True;
158 Preallocated_Stacks : constant Boolean := True;
159 Signed_Zeros : constant Boolean := True;
160 Stack_Check_Default : constant Boolean := False;
161 Stack_Check_Probes : constant Boolean := True;
162 Stack_Check_Limits : constant Boolean := False;
163 Support_Aggregates : constant Boolean := True;
164 Support_Composite_Assign : constant Boolean := True;
165 Support_Composite_Compare : constant Boolean := True;
166 Support_Long_Shifts : constant Boolean := True;
167 Always_Compatible_Rep : constant Boolean := True;
168 Suppress_Standard_Library : constant Boolean := False;
169 Use_Ada_Main_Program_Name : constant Boolean := False;
170 Frontend_Exceptions : constant Boolean := False;
171 ZCX_By_Default : constant Boolean := True;
172
173 -- Select the appropriate entry point, linker script, and libraries for a
174 -- PikeOS partition.
175
176 -- Traditionally the entry point of a native application is _p4_entry. For
177 -- an APEX application, it is _begin.
178
179 -- In order to use the same link options for both personalities, _begin is
180 -- used for native as well.
181
182 pragma Linker_Options
183 ("-u_begin" & ASCII.NUL & "-e_begin" & ASCII.NUL &
184 "-nostdlib" & ASCII.NUL &
185 "-T../scripts/app-ld-script" & ASCII.NUL &
186 "-lvm" & ASCII.NUL & "-lp4" & ASCII.NUL & "-lstand" & ASCII.NUL &
187 "-lgcc");
188
189 end System;