Add minimal GNAT run time system (RTS)

Add a stripped-down version of libgnat. This is somehow comparable to
libgcc but for Ada programs. It's licensed under GPLv3 but with the
runtime library exception. So it's totally fine to link it with our
GPLv2 code and keep it under GPLv2.

Change-Id: Ie6522abf093f0a516b9ae18ddc69131bd721dc0c
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/11836
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Edward O'Callaghan <edward.ocallaghan@koparo.com>

1 files changed, 63 insertions, 0 deletions

diff --git a/src/lib/gnat/s-atacco.ads b/src/lib/gnat/s-atacco.ads
new file mode 100644
index 0000000000..fb6232d14a
--- /dev/null
+++ b/src/lib/gnat/s-atacco.ads
@@ -0,0 +1,63 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+-- S Y S T E M . A D D R E S S _ T O _ A C C E S S _ C O N V E R S I O N S  --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--          Copyright (C) 1992-2012, 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.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+generic
+   type Object (<>) is limited private;
+
+package System.Address_To_Access_Conversions is
+   pragma Preelaborate;
+
+   pragma Compile_Time_Warning
+     (Object'Unconstrained_Array,
+      "Object is unconstrained array type" & ASCII.LF &
+      "To_Pointer results may not have bounds");
+
+   type Object_Pointer is access all Object;
+   for Object_Pointer'Size use Standard'Address_Size;
+
+   pragma No_Strict_Aliasing (Object_Pointer);
+   --  Strictly speaking, this routine should not be used to generate pointers
+   --  to other than proper values of the proper type, but in practice, this
+   --  is done all the time. This pragma stops the compiler from doing some
+   --  optimizations that may cause unexpected results based on the assumption
+   --  of no strict aliasing.
+
+   function To_Pointer (Value : Address)        return Object_Pointer;
+   function To_Address (Value : Object_Pointer) return Address;
+
+   pragma Import (Intrinsic, To_Pointer);
+   pragma Import (Intrinsic, To_Address);
+
+end System.Address_To_Access_Conversions;