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, 161 insertions, 0 deletions

diff --git a/src/lib/gnat/interfac.ads b/src/lib/gnat/interfac.ads
new file mode 100644
index 0000000000..e7e196c594
--- /dev/null
+++ b/src/lib/gnat/interfac.ads
@@ -0,0 +1,161 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+--                           I N T E R F A C E S                            --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--          Copyright (C) 2002-2014, 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 implementation dependent sections of this file.      --
+--                                                                          --
+-- 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.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+pragma Compiler_Unit_Warning;
+
+package Interfaces is
+   pragma Pure;
+
+   --  All identifiers in this unit are implementation defined
+
+   pragma Implementation_Defined;
+
+   type Integer_8  is range -2 **  7 .. 2 **  7 - 1;
+   for Integer_8'Size use  8;
+
+   type Integer_16 is range -2 ** 15 .. 2 ** 15 - 1;
+   for Integer_16'Size use 16;
+
+   type Integer_32 is range -2 ** 31 .. 2 ** 31 - 1;
+   for Integer_32'Size use 32;
+
+   type Integer_64 is new Long_Long_Integer;
+   for Integer_64'Size use 64;
+   --  Note: we use Long_Long_Integer'First instead of -2 ** 63 to allow this
+   --  unit to compile when using custom target configuration files where the
+   --  maximum integer is 32 bits. This is useful for static analysis tools
+   --  such as SPARK or CodePeer. In the normal case Long_Long_Integer is
+   --  always 64-bits so we get the desired 64-bit type.
+
+   type Unsigned_8  is mod 2 ** 8;
+   for Unsigned_8'Size use  8;
+
+   type Unsigned_16 is mod 2 ** 16;
+   for Unsigned_16'Size use 16;
+
+   type Unsigned_32 is mod 2 ** 32;
+   for Unsigned_32'Size use 32;
+
+   type Unsigned_64 is mod 2 ** Long_Long_Integer'Size;
+   for Unsigned_64'Size use 64;
+   --  See comment on Integer_64 above
+
+   function Shift_Left
+     (Value  : Unsigned_8;
+      Amount : Natural) return Unsigned_8;
+
+   function Shift_Right
+     (Value  : Unsigned_8;
+      Amount : Natural) return Unsigned_8;
+
+   function Shift_Right_Arithmetic
+     (Value  : Unsigned_8;
+      Amount : Natural) return Unsigned_8;
+
+   function Rotate_Left
+     (Value  : Unsigned_8;
+      Amount : Natural) return Unsigned_8;
+
+   function Rotate_Right
+     (Value  : Unsigned_8;
+      Amount : Natural) return Unsigned_8;
+
+   function Shift_Left
+     (Value  : Unsigned_16;
+      Amount : Natural) return Unsigned_16;
+
+   function Shift_Right
+     (Value  : Unsigned_16;
+      Amount : Natural) return Unsigned_16;
+
+   function Shift_Right_Arithmetic
+     (Value  : Unsigned_16;
+      Amount : Natural) return Unsigned_16;
+
+   function Rotate_Left
+     (Value  : Unsigned_16;
+      Amount : Natural) return Unsigned_16;
+
+   function Rotate_Right
+     (Value  : Unsigned_16;
+      Amount : Natural) return Unsigned_16;
+
+   function Shift_Left
+     (Value  : Unsigned_32;
+      Amount : Natural) return Unsigned_32;
+
+   function Shift_Right
+     (Value  : Unsigned_32;
+      Amount : Natural) return Unsigned_32;
+
+   function Shift_Right_Arithmetic
+     (Value  : Unsigned_32;
+      Amount : Natural) return Unsigned_32;
+
+   function Rotate_Left
+     (Value  : Unsigned_32;
+      Amount : Natural) return Unsigned_32;
+
+   function Rotate_Right
+     (Value  : Unsigned_32;
+      Amount : Natural) return Unsigned_32;
+
+   function Shift_Left
+     (Value  : Unsigned_64;
+      Amount : Natural) return Unsigned_64;
+
+   function Shift_Right
+     (Value  : Unsigned_64;
+      Amount : Natural) return Unsigned_64;
+
+   function Shift_Right_Arithmetic
+     (Value  : Unsigned_64;
+      Amount : Natural) return Unsigned_64;
+
+   function Rotate_Left
+     (Value  : Unsigned_64;
+      Amount : Natural) return Unsigned_64;
+
+   function Rotate_Right
+     (Value  : Unsigned_64;
+      Amount : Natural) return Unsigned_64;
+
+   pragma Import (Intrinsic, Shift_Left);
+   pragma Import (Intrinsic, Shift_Right);
+   pragma Import (Intrinsic, Shift_Right_Arithmetic);
+   pragma Import (Intrinsic, Rotate_Left);
+   pragma Import (Intrinsic, Rotate_Right);
+
+end Interfaces;