File : system-pikeos-ppc-minimal.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 Minimal version of this package for PowerPC PikeOS 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 Restrictions (No_Tasking);
55 -- Tasking is not supported in this run time
56
57 package System is
58 pragma Pure;
59 -- Note that we take advantage of the implementation permission to make
60 -- this unit Pure instead of Preelaborable (see RM 13.7.1(15)). In Ada
61 -- 2005, this is Pure in any case (AI-362).
62
63 pragma No_Elaboration_Code_All;
64 -- Allow the use of that restriction in units that WITH this unit
65
66 type Name is (SYSTEM_NAME_GNAT);
67 System_Name : constant Name := SYSTEM_NAME_GNAT;
68
69 -- System-Dependent Named Numbers
70
71 Min_Int : constant := Long_Long_Integer'First;
72 Max_Int : constant := Long_Long_Integer'Last;
73
74 Max_Binary_Modulus : constant := 2 ** Long_Long_Integer'Size;
75 Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
76
77 Max_Base_Digits : constant := Long_Long_Float'Digits;
78 Max_Digits : constant := Long_Long_Float'Digits;
79
80 Max_Mantissa : constant := 63;
81 Fine_Delta : constant := 2.0 ** (-Max_Mantissa);
82
83 Tick : constant := 0.000_000_001; -- 1 ns
84
85 -- Storage-related Declarations
86
87 type Address is private;
88 pragma Preelaborable_Initialization (Address);
89 Null_Address : constant Address;
90
91 Storage_Unit : constant := 8;
92 Word_Size : constant := 32;
93 Memory_Size : constant := 2 ** 32;
94
95 -- Address comparison
96
97 function "<" (Left, Right : Address) return Boolean;
98 function "<=" (Left, Right : Address) return Boolean;
99 function ">" (Left, Right : Address) return Boolean;
100 function ">=" (Left, Right : Address) return Boolean;
101 function "=" (Left, Right : Address) return Boolean;
102
103 pragma Import (Intrinsic, "<");
104 pragma Import (Intrinsic, "<=");
105 pragma Import (Intrinsic, ">");
106 pragma Import (Intrinsic, ">=");
107 pragma Import (Intrinsic, "=");
108
109 -- Other System-Dependent Declarations
110
111 type Bit_Order is (High_Order_First, Low_Order_First);
112 Default_Bit_Order : constant Bit_Order := High_Order_First;
113 pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
114
115 -- Priority-related Declarations (RM D.1)
116
117 -- For simplicity there is a 1-1 correspondence between Ada and PikeOS
118 -- priorities. PikeOS priority 0 is reserved by the idle thread, so not
119 -- available to Ada.
120
121 -- PikeOS priorities are 0 .. 255
122
123 -- Priorities greather than 245 are reserved to the system software (PSSW)
124
125 -- This implementation reserves priorities 224-239 to interrupts
126
127 -- Priorities 240-245 are reserved to HM and PikeOS exception handlers
128
129 Max_Priority : constant Positive := 223;
130 Max_Interrupt_Priority : constant Positive := 239;
131
132 subtype Any_Priority is Integer range 1 .. Max_Interrupt_Priority;
133 subtype Priority is Any_Priority
134 range Any_Priority'First .. Max_Priority;
135 subtype Interrupt_Priority is Any_Priority
136 range Priority'Last + 1 .. Any_Priority'Last;
137
138 Default_Priority : constant Priority :=
139 (Priority'First + Priority'Last) / 2;
140
141 private
142
143 type Address is mod Memory_Size;
144 Null_Address : constant Address := 0;
145
146 --------------------------------------
147 -- System Implementation Parameters --
148 --------------------------------------
149
150 -- These parameters provide information about the target that is used
151 -- by the compiler. They are in the private part of System, where they
152 -- can be accessed using the special circuitry in the Targparm unit
153 -- whose source should be consulted for more detailed descriptions
154 -- of the individual switch values.
155
156 Atomic_Sync_Default : constant Boolean := False;
157 Backend_Divide_Checks : constant Boolean := False;
158 Backend_Overflow_Checks : constant Boolean := True;
159 Command_Line_Args : constant Boolean := False;
160 Configurable_Run_Time : constant Boolean := True;
161 Denorm : constant Boolean := True;
162 Duration_32_Bits : constant Boolean := False;
163 Exit_Status_Supported : constant Boolean := False;
164 Fractional_Fixed_Ops : constant Boolean := False;
165 Frontend_Layout : constant Boolean := False;
166 Machine_Overflows : constant Boolean := False;
167 Machine_Rounds : constant Boolean := True;
168 Preallocated_Stacks : constant Boolean := True;
169 Signed_Zeros : constant Boolean := True;
170 Stack_Check_Default : constant Boolean := False;
171 Stack_Check_Probes : constant Boolean := True;
172 Stack_Check_Limits : constant Boolean := False;
173 Support_Aggregates : constant Boolean := True;
174 Support_Composite_Assign : constant Boolean := True;
175 Support_Composite_Compare : constant Boolean := True;
176 Support_Long_Shifts : constant Boolean := True;
177 Always_Compatible_Rep : constant Boolean := True;
178 Suppress_Standard_Library : constant Boolean := True;
179 Use_Ada_Main_Program_Name : constant Boolean := False;
180 Frontend_Exceptions : constant Boolean := False;
181 ZCX_By_Default : constant Boolean := True;
182
183 -- Select the appropriate entry point, linker script, and libraries for a
184 -- PikeOS partition.
185
186 -- Traditionally the entry point of a native application is _p4_entry. For
187 -- an APEX application, it is _begin.
188
189 -- In order to use the same link options for both personalities, _begin is
190 -- used for native as well.
191
192 pragma Linker_Options
193 ("-u_begin" & ASCII.NUL & "-e_begin" & ASCII.NUL &
194 "-nostdlib" & ASCII.NUL &
195 "-T../scripts/app-ld-script" & ASCII.NUL &
196 "-lvm" & ASCII.NUL & "-lp4" & ASCII.NUL & "-lstand" & ASCII.NUL &
197 "-lgcc");
198
199 end System;