gcc/ada/libgnat/system-linux-riscv.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/RISC-V Version)                      --
   9 --                                                                          --
  10 --          Copyright (C) 1992-2023, 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;
  39    --  Note that we take advantage of the implementation permission to make
  40    --  this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada
  41    --  2005, this is Pure in any case (AI-362).
  42
  43    pragma No_Elaboration_Code_All;
  44    --  Allow the use of that restriction in units that WITH this unit
  45
  46    type Name is (SYSTEM_NAME_GNAT);
  47    System_Name : constant Name := SYSTEM_NAME_GNAT;
  48
  49    --  System-Dependent Named Numbers
  50
  51    Min_Int             : constant := -2 ** (Standard'Max_Integer_Size - 1);
  52    Max_Int             : constant :=  2 ** (Standard'Max_Integer_Size - 1) - 1;
  53
  54    Max_Binary_Modulus    : constant := 2 ** Standard'Max_Integer_Size;
  55    Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
  56
  57    Max_Base_Digits       : constant := Long_Long_Float'Digits;
  58    Max_Digits            : constant := Long_Long_Float'Digits;
  59
  60    Max_Mantissa          : constant := Standard'Max_Integer_Size - 1;
  61    Fine_Delta            : constant := 2.0 ** (-Max_Mantissa);
  62
  63    Tick                  : constant := 0.000_001;
  64
  65    --  Storage-related Declarations
  66
  67    type Address is private;
  68    pragma Preelaborable_Initialization (Address);
  69    Null_Address : constant Address;
  70
  71    Storage_Unit : constant := 8;
  72    Word_Size    : constant := Standard'Word_Size;
  73    Memory_Size  : constant := 2 ** Word_Size;
  74
  75    --  Address comparison
  76
  77    function "<"  (Left, Right : Address) return Boolean;
  78    function "<=" (Left, Right : Address) return Boolean;
  79    function ">"  (Left, Right : Address) return Boolean;
  80    function ">=" (Left, Right : Address) return Boolean;
  81    function "="  (Left, Right : Address) return Boolean;
  82
  83    pragma Import (Intrinsic, "<");
  84    pragma Import (Intrinsic, "<=");
  85    pragma Import (Intrinsic, ">");
  86    pragma Import (Intrinsic, ">=");
  87    pragma Import (Intrinsic, "=");
  88
  89    --  Other System-Dependent Declarations
  90
  91    type Bit_Order is (High_Order_First, Low_Order_First);
  92    Default_Bit_Order : constant Bit_Order := Low_Order_First;
  93    pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
  94
  95    --  Priority-related Declarations (RM D.1)
  96
  97    Max_Priority           : constant Positive := 30;
  98    Max_Interrupt_Priority : constant Positive := 31;
  99
 100    subtype Any_Priority       is Integer      range  0 .. 31;
 101    subtype Priority           is Any_Priority range  0 .. 30;
 102    subtype Interrupt_Priority is Any_Priority range 31 .. 31;
 103
 104    Default_Priority : constant Priority := 15;
 105
 106 private
 107
 108    type Address is mod Memory_Size;
 109    for Address'Size use Standard'Address_Size;
 110
 111    Null_Address : constant Address := 0;
 112
 113    --------------------------------------
 114    -- System Implementation Parameters --
 115    --------------------------------------
 116
 117    --  These parameters provide information about the target that is used
 118    --  by the compiler. They are in the private part of System, where they
 119    --  can be accessed using the special circuitry in the Targparm unit
 120    --  whose source should be consulted for more detailed descriptions
 121    --  of the individual switch values.
 122
 123    Backend_Divide_Checks     : constant Boolean := False;
 124    Backend_Overflow_Checks   : constant Boolean := True;
 125    Command_Line_Args         : constant Boolean := True;
 126    Configurable_Run_Time     : constant Boolean := False;
 127    Denorm                    : constant Boolean := True;
 128    Duration_32_Bits          : constant Boolean := False;
 129    Exit_Status_Supported     : constant Boolean := True;
 130    Machine_Overflows         : constant Boolean := False;
 131    Machine_Rounds            : constant Boolean := True;
 132    Preallocated_Stacks       : constant Boolean := False;
 133    Signed_Zeros              : constant Boolean := True;
 134    Stack_Check_Default       : constant Boolean := False;
 135    Stack_Check_Probes        : constant Boolean := True;
 136    Stack_Check_Limits        : constant Boolean := False;
 137    Support_Aggregates        : constant Boolean := True;
 138    Support_Composite_Assign  : constant Boolean := True;
 139    Support_Composite_Compare : constant Boolean := True;
 140    Support_Long_Shifts       : constant Boolean := True;
 141    Always_Compatible_Rep     : constant Boolean := False;
 142    Suppress_Standard_Library : constant Boolean := False;
 143    Use_Ada_Main_Program_Name : constant Boolean := False;
 144    ZCX_By_Default            : constant Boolean := True;
 145
 146 end System;