gcc/ada/system-linux-s390x.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                        GNAT RUN-TIME COMPONENTS                          --
   4 --                                                                          --
   5 --                               S Y S T E M                                --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                          (GNU-Linux/s390x Version)                       --
   9 --                                                                          --
  10 --          Copyright (C) 1992-2009, 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 package System is
  38 pragma Pure (System);
  39 --  Note that we take advantage of the implementation permission to
  40 --  make this unit Pure instead of Preelaborable, see RM 13.7(36)
  41
  42    type Name is (SYSTEM_NAME_GNAT);
  43    System_Name : constant Name := SYSTEM_NAME_GNAT;
  44
  45    --  System-Dependent Named Numbers
  46
  47    Min_Int               : constant := Long_Long_Integer'First;
  48    Max_Int               : constant := Long_Long_Integer'Last;
  49
  50    Max_Binary_Modulus    : constant := 2 ** Long_Long_Integer'Size;
  51    Max_Nonbinary_Modulus : constant := Integer'Last;
  52
  53    Max_Base_Digits       : constant := Long_Long_Float'Digits;
  54    Max_Digits            : constant := Long_Long_Float'Digits;
  55
  56    Max_Mantissa          : constant := 63;
  57    Fine_Delta            : constant := 2.0 ** (-Max_Mantissa);
  58
  59    Tick                  : constant := 0.000_001;
  60
  61    --  Storage-related Declarations
  62
  63    type Address is private;
  64    Null_Address : constant Address;
  65
  66    Storage_Unit : constant := 8;
  67    Word_Size    : constant := 64;
  68    Memory_Size  : constant := 2 ** 64;
  69
  70    --  Address comparison
  71
  72    function "<"  (Left, Right : Address) return Boolean;
  73    function "<=" (Left, Right : Address) return Boolean;
  74    function ">"  (Left, Right : Address) return Boolean;
  75    function ">=" (Left, Right : Address) return Boolean;
  76    function "="  (Left, Right : Address) return Boolean;
  77
  78    pragma Import (Intrinsic, "<");
  79    pragma Import (Intrinsic, "<=");
  80    pragma Import (Intrinsic, ">");
  81    pragma Import (Intrinsic, ">=");
  82    pragma Import (Intrinsic, "=");
  83
  84    --  Other System-Dependent Declarations
  85
  86    type Bit_Order is (High_Order_First, Low_Order_First);
  87    Default_Bit_Order : constant Bit_Order := High_Order_First;
  88    pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
  89
  90    --  Priority-related Declarations (RM D.1)
  91
  92    Max_Priority           : constant Positive := 30;
  93    Max_Interrupt_Priority : constant Positive := 31;
  94
  95    subtype Any_Priority       is Integer      range  0 .. 31;
  96    subtype Priority           is Any_Priority range  0 .. 30;
  97    subtype Interrupt_Priority is Any_Priority range 31 .. 31;
  98
  99    Default_Priority : constant Priority := 15;
 100
 101 private
 102
 103    type Address is mod Memory_Size;
 104    Null_Address : constant Address := 0;
 105
 106    --------------------------------------
 107    -- System Implementation Parameters --
 108    --------------------------------------
 109
 110    --  These parameters provide information about the target that is used
 111    --  by the compiler. They are in the private part of System, where they
 112    --  can be accessed using the special circuitry in the Targparm unit
 113    --  whose source should be consulted for more detailed descriptions
 114    --  of the individual switch values.
 115
 116    AAMP                      : constant Boolean := False;
 117    Backend_Divide_Checks     : constant Boolean := False;
 118    Backend_Overflow_Checks   : constant Boolean := False;
 119    Command_Line_Args         : constant Boolean := True;
 120    Compiler_System_Version   : constant Boolean := False;
 121    Configurable_Run_Time     : constant Boolean := False;
 122    Denorm                    : constant Boolean := True;
 123    Duration_32_Bits          : constant Boolean := False;
 124    Exit_Status_Supported     : constant Boolean := True;
 125    Fractional_Fixed_Ops      : constant Boolean := False;
 126    Frontend_Layout           : constant Boolean := False;
 127    Machine_Overflows         : constant Boolean := False;
 128    Machine_Rounds            : constant Boolean := True;
 129    OpenVMS                   : constant Boolean := False;
 130    Preallocated_Stacks       : constant Boolean := False;
 131    Signed_Zeros              : constant Boolean := True;
 132    Stack_Check_Default       : constant Boolean := False;
 133    Stack_Check_Probes        : constant Boolean := False;
 134    Support_64_Bit_Divides    : constant Boolean := True;
 135    Support_Aggregates        : constant Boolean := True;
 136    Support_Composite_Assign  : constant Boolean := True;
 137    Support_Composite_Compare : constant Boolean := True;
 138    Support_Long_Shifts       : constant Boolean := True;
 139    Suppress_Standard_Library : constant Boolean := False;
 140    Use_Ada_Main_Program_Name : constant Boolean := False;
 141    ZCX_By_Default            : constant Boolean := True;
 142    GCC_ZCX_Support           : constant Boolean := True;
 143    Front_End_ZCX_Support     : constant Boolean := False;
 144
 145    --  Obsolete entries, to be removed eventually (bootstrap issues!)
 146
 147    High_Integrity_Mode       : constant Boolean := False;
 148    Long_Shifts_Inlined       : constant Boolean := True;
 149
 150 end System;