gcc/ada/libgnat/system-vxworks-ppc-ravenscar.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                        GNAT RUN-TIME COMPONENTS                          --
   4 --                                                                          --
   5 --                               S Y S T E M                                --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                   (VxWorks/HIE Ravenscar Version PPC)                    --
   9 --                                                                          --
  10 --          Copyright (C) 1992-2017, 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 -- As a special exception under Section 7 of GPL version 3, you are granted --
  24 -- additional permissions described in the GCC Runtime Library Exception,   --
  25 -- version 3.1, as published by the Free Software Foundation.               --
  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 VxWorks version of this package for PowerPC 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 := 1.0 / 60.0;
  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    --  Ada priorities are mapped to VxWorks priorities using the following
 123    --  transformation: 255 - Ada Priority
 124
 125    --  Ada priorities are used as follows:
 126
 127    --  256        is reserved for the VxWorks kernel
 128    --  248 - 255  correspond to hardware interrupt levels 0 .. 7
 129    --  247        is a catchall default "interrupt" priority for signals,
 130    --             allowing higher priority than normal tasks, but lower than
 131    --             hardware priority levels.  Protected Object ceilings can
 132    --             override these values.
 133    --  246        is used by the Interrupt_Manager task
 134
 135    Max_Priority           : constant Positive := 245;
 136    Max_Interrupt_Priority : constant Positive := 255;
 137
 138    subtype Any_Priority       is Integer      range   0 .. 255;
 139    subtype Priority           is Any_Priority range   0 .. 245;
 140    subtype Interrupt_Priority is Any_Priority range 246 .. 255;
 141
 142    Default_Priority : constant Priority := 122;
 143
 144 private
 145
 146    type Address is mod Memory_Size;
 147    Null_Address : constant Address := 0;
 148
 149    --------------------------------------
 150    -- System Implementation Parameters --
 151    --------------------------------------
 152
 153    --  These parameters provide information about the target that is used
 154    --  by the compiler. They are in the private part of System, where they
 155    --  can be accessed using the special circuitry in the Targparm unit
 156    --  whose source should be consulted for more detailed descriptions
 157    --  of the individual switch values.
 158
 159    Backend_Divide_Checks     : constant Boolean := False;
 160    Backend_Overflow_Checks   : constant Boolean := True;
 161    Command_Line_Args         : constant Boolean := False;
 162    Configurable_Run_Time     : constant Boolean := True;
 163    Denorm                    : constant Boolean := True;
 164    Duration_32_Bits          : constant Boolean := True;
 165    Exit_Status_Supported     : constant Boolean := True;
 166    Fractional_Fixed_Ops      : constant Boolean := False;
 167    Frontend_Layout           : constant Boolean := False;
 168    Machine_Overflows         : constant Boolean := True;
 169    Machine_Rounds            : constant Boolean := True;
 170    Preallocated_Stacks       : constant Boolean := False;
 171    Signed_Zeros              : constant Boolean := True;
 172    Stack_Check_Default       : constant Boolean := False;
 173    Stack_Check_Probes        : constant Boolean := False;
 174    Stack_Check_Limits        : constant Boolean := True;
 175    Support_Aggregates        : constant Boolean := True;
 176    Support_Composite_Assign  : constant Boolean := True;
 177    Support_Composite_Compare : constant Boolean := True;
 178    Support_Long_Shifts       : constant Boolean := True;
 179    Always_Compatible_Rep     : constant Boolean := True;
 180    Suppress_Standard_Library : constant Boolean := True;
 181    Use_Ada_Main_Program_Name : constant Boolean := True;
 182    Frontend_Exceptions       : constant Boolean := True;
 183    ZCX_By_Default            : constant Boolean := False;
 184
 185    Executable_Extension : constant String := ".out";
 186
 187 end System;