[Ada] Initial port of x86-lynx178elf runtimes

2018-05-24  Doug Rupp  <rupp@adacore.com>

gcc/ada/

	* argv-lynxos178-raven-cert.c: New file.
	* libgnat/system-lynxos178-x86.ads: New file.

From-SVN: r260641

gcc/ada/ChangeLog

+2018-05-24  Doug Rupp  <rupp@adacore.com>
+
+	* argv-lynxos178-raven-cert.c: New file.
+	* libgnat/system-lynxos178-x86.ads: New file.
+
 2018-05-23  Hristian Kirtchev  <kirtchev@adacore.com>
 
 	* exp_disp.adb, freeze.adb, gnat1drv.adb, sem_ch5.adb, sem_spark.adb:

gcc/ada/argv-lynxos178-raven-cert.c

+/****************************************************************************
+ *                                                                          *
+ *                         GNAT COMPILER COMPONENTS                         *
+ *                                                                          *
+ *                                A R G V                                   *
+ *                                                                          *
+ *                          C Implementation File                           *
+ *                                                                          *
+ *         Copyright (C) 1992-2018, Free Software Foundation, Inc.          *
+ *                                                                          *
+ * GNAT is free software;  you can  redistribute it  and/or modify it under *
+ * terms of the  GNU General Public License as published  by the Free Soft- *
+ * ware  Foundation;  either version 3,  or (at your option) any later ver- *
+ * sion.  GNAT is distributed in the hope that it will be useful, but WITH- *
+ * OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY *
+ * or FITNESS FOR A PARTICULAR PURPOSE.                                     *
+ *                                                                          *
+ * As a special exception under Section 7 of GPL version 3, you are granted *
+ * additional permissions described in the GCC Runtime Library Exception,   *
+ * version 3.1, as published by the Free Software Foundation.               *
+ *                                                                          *
+ * You should have received a copy of the GNU General Public License and    *
+ * a copy of the GCC Runtime Library Exception along with this program;     *
+ * see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    *
+ * <http://www.gnu.org/licenses/>.                                          *
+ *                                                                          *
+ * GNAT was originally developed  by the GNAT team at  New York University. *
+ * Extensive contributions were provided by Ada Core Technologies Inc.      *
+ *                                                                          *
+ ****************************************************************************/
+
+/* Routines for accessing command line arguments from both the runtime
+   library and from the compiler itself.  In the former case, gnat_argc
+   and gnat_argv are the original argc and argv values as stored by the
+   binder generated main program, and these routines are accessed from
+   the Ada.Command_Line package.  In the compiler case, gnat_argc and
+   gnat_argv are the values as modified by toplev, and these routines
+   are accessed from the Osint package.  */
+
+/* This version is for the ravenscar-cert runtime in LynxOS-178, with
+   minimal support for Ada.Command_Line.Command_Name */
+
+#include <sys/types.h>
+#include <string.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* argc and argv of the main program are saved under gnat_argc and gnat_argv,
+   envp of the main program is saved under gnat_envp.
+   While gnat_argc and gnat_envp are not needed, they are referenced from
+   the binder-generated file so they need to be defined here */
+
+int gnat_argc = 0;
+const char **gnat_argv = (const char **) 0;
+const char **gnat_envp = (const char **) 0;
+
+int
+__gnat_len_arg (int arg_num)
+{
+  if (gnat_argv != NULL)
+    return strlen (gnat_argv[arg_num]);
+  else
+    return 0;
+}
+
+void
+__gnat_fill_arg (char *a, int i)
+{
+  if (gnat_argv != NULL)
+    strncpy (a, gnat_argv[i], strlen(gnat_argv[i]));
+}
+
+#ifdef __cplusplus
+}
+#endif

gcc/ada/libgnat/system-lynxos178-x86.ads

+------------------------------------------------------------------------------
+--                                                                          --
+--                        GNAT RUN-TIME COMPONENTS                          --
+--                                                                          --
+--                               S Y S T E M                                --
+--                                                                          --
+--                                 S p e c                                  --
+--                         (LynxOS-178 X86 Version)                         --
+--                                                                          --
+--          Copyright (C) 2009-2018, Free Software Foundation, Inc.         --
+--                                                                          --
+-- This specification is derived from the Ada Reference Manual for use with --
+-- GNAT. The copyright notice above, and the license provisions that follow --
+-- apply solely to the  contents of the part following the private keyword. --
+--                                                                          --
+-- GNAT is free software;  you can  redistribute it  and/or modify it under --
+-- terms of the  GNU General Public License as published  by the Free Soft- --
+-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
+-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
+--                                                                          --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception,   --
+-- version 3.1, as published by the Free Software Foundation.               --
+--                                                                          --
+-- You should have received a copy of the GNU General Public License and    --
+-- a copy of the GCC Runtime Library Exception along with this program;     --
+-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
+-- <http://www.gnu.org/licenses/>.                                          --
+--                                                                          --
+-- GNAT was originally developed  by the GNAT team at  New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+package System is
+   pragma Pure;
+   --  Note that we take advantage of the implementation permission to make
+   --  this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada
+   --  2005, this is Pure in any case (AI-362).
+
+   pragma No_Elaboration_Code_All;
+   --  Allow the use of that restriction in units that WITH this unit
+
+   type Name is (SYSTEM_NAME_GNAT);
+   System_Name : constant Name := SYSTEM_NAME_GNAT;
+
+   --  System-Dependent Named Numbers
+
+   Min_Int               : constant := Long_Long_Integer'First;
+   Max_Int               : constant := Long_Long_Integer'Last;
+
+   Max_Binary_Modulus    : constant := 2 ** Long_Long_Integer'Size;
+   Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
+
+   Max_Base_Digits       : constant := Long_Long_Float'Digits;
+   Max_Digits            : constant := Long_Long_Float'Digits;
+
+   Max_Mantissa          : constant := 63;
+   Fine_Delta            : constant := 2.0 ** (-Max_Mantissa);
+
+   Tick                  : constant := 0.01;
+
+   --  Storage-related Declarations
+
+   type Address is private;
+   pragma Preelaborable_Initialization (Address);
+   Null_Address : constant Address;
+
+   Storage_Unit : constant := 8;
+   Word_Size    : constant := 32;
+   Memory_Size  : constant := 2 ** 32;
+
+   --  Address comparison
+
+   function "<"  (Left, Right : Address) return Boolean;
+   function "<=" (Left, Right : Address) return Boolean;
+   function ">"  (Left, Right : Address) return Boolean;
+   function ">=" (Left, Right : Address) return Boolean;
+   function "="  (Left, Right : Address) return Boolean;
+
+   pragma Import (Intrinsic, "<");
+   pragma Import (Intrinsic, "<=");
+   pragma Import (Intrinsic, ">");
+   pragma Import (Intrinsic, ">=");
+   pragma Import (Intrinsic, "=");
+
+   --  Other System-Dependent Declarations
+
+   type Bit_Order is (High_Order_First, Low_Order_First);
+   Default_Bit_Order : constant Bit_Order := Low_Order_First;
+   pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
+
+   --  Priority-related Declarations (RM D.1)
+
+   --  17 is the system determined default priority for user applications
+   --  running on LynxOS.
+
+   --  The standard (Rm 13.7) requires that Default_Priority has the value:
+
+   --  (Priority'First + Priority'Last) / 2
+
+   --  However, the default priority given by the OS is not the same thing as
+   --  the Ada value Default_Prioirity (previous examples include VxWorks).
+   --  Therefore, we follow a model based on the full range of LynxOS-178
+   --  priorities.
+
+   Max_Priority           : constant Positive := 252;
+   Max_Interrupt_Priority : constant Positive := 255;
+
+   subtype Any_Priority       is Integer      range   0 .. 255;
+   subtype Priority           is Any_Priority range   0 .. 252;
+   subtype Interrupt_Priority is Any_Priority range 253 .. 255;
+
+   Default_Priority : constant Priority := 126;
+
+   --  Note that the priority of the environment task is set externally by the
+   --  OS
+
+private
+
+   type Address is mod Memory_Size;
+   Null_Address : constant Address := 0;
+
+   --------------------------------------
+   -- System Implementation Parameters --
+   --------------------------------------
+
+   --  These parameters provide information about the target that is used
+   --  by the compiler. They are in the private part of System, where they
+   --  can be accessed using the special circuitry in the Targparm unit
+   --  whose source should be consulted for more detailed descriptions
+   --  of the individual switch values.
+
+   Backend_Divide_Checks     : constant Boolean := False;
+   Backend_Overflow_Checks   : constant Boolean := True;
+   Command_Line_Args         : constant Boolean := True;
+   Configurable_Run_Time     : constant Boolean := False;
+   Denorm                    : constant Boolean := True;
+   Duration_32_Bits          : constant Boolean := False;
+   Exit_Status_Supported     : constant Boolean := True;
+   Fractional_Fixed_Ops      : constant Boolean := False;
+   Frontend_Layout           : constant Boolean := False;
+   Machine_Overflows         : constant Boolean := False;
+   Machine_Rounds            : constant Boolean := True;
+   Preallocated_Stacks       : constant Boolean := False;
+   Signed_Zeros              : constant Boolean := True;
+   Stack_Check_Default       : constant Boolean := False;
+   Stack_Check_Probes        : constant Boolean := True;
+   Stack_Check_Limits        : constant Boolean := False;
+   Support_Aggregates        : constant Boolean := True;
+   Support_Composite_Assign  : constant Boolean := True;
+   Support_Composite_Compare : constant Boolean := True;
+   Support_Long_Shifts       : constant Boolean := True;
+   Always_Compatible_Rep     : constant Boolean := False;
+   Suppress_Standard_Library : constant Boolean := False;
+   Use_Ada_Main_Program_Name : constant Boolean := False;
+   Frontend_Exceptions       : constant Boolean := False;
+   ZCX_By_Default            : constant Boolean := False;
+
+end System;