First import from sources

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diff --git a/translate/grt/grt-stacks.ads b/translate/grt/grt-stacks.ads
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+--  GHDL Run Time (GRT) - process stacks.
+--  Copyright (C) 2002, 2003, 2004, 2005 Tristan Gingold
+--
+--  GHDL is free software; you can redistribute it and/or modify it under
+--  the terms of the GNU General Public License as published by the Free
+--  Software Foundation; either version 2, or (at your option) any later
+--  version.
+--
+--  GHDL is distributed in the hope that it will be useful, but WITHOUT ANY
+--  WARRANTY; without even the implied warranty of MERCHANTABILITY or
+--  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+--  for more details.
+--
+--  You should have received a copy of the GNU General Public License
+--  along with GCC; see the file COPYING.  If not, write to the Free
+--  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+--  02111-1307, USA.
+with System; use System;
+
+package Grt.Stacks is
+   type Stack_Type is new Address;
+   Null_Stack : constant Stack_Type := Stack_Type (Null_Address);
+
+   --  The main stack.  This is initialized by STACK_INIT.
+   --  The return point.
+   Main_Stack : Stack_Type;
+
+   --  Initialize the stacks package.
+   --  This may adjust stack sizes.
+   --  Must be called after grt.options.decode.
+   procedure Stack_Init;
+
+   --  Create a new stack, which on first execution will call FUNC with
+   --  an argument ARG.
+   function Stack_Create (Func : Address; Arg : Address) return Stack_Type;
+
+   --  Resume stack TO and save the current context to the stack pointed by
+   --  CUR.
+   procedure Stack_Switch (To : Stack_Type; From : Stack_Type);
+
+   --  Delete stack STACK, which must not be currently executed.
+   procedure Stack_Delete (Stack : Stack_Type);
+
+   --  Error during stack handling:
+   --  Cannot grow the stack.
+   procedure Error_Grow_Failed;
+   pragma No_Return (Error_Grow_Failed);
+
+   --  Invalid memory access detected (other than dereferencing a NULL access).
+   procedure Error_Memory_Access;
+   pragma No_Return (Error_Memory_Access);
+
+   --  A NULL access is dereferenced.
+   procedure Error_Null_Access;
+   pragma No_Return (Error_Null_Access);
+private
+   pragma Export (C, Main_Stack, "grt_stack_main_stack");
+
+   pragma Import (C, Stack_Init, "grt_stack_init");
+   pragma Import (C, Stack_Create, "grt_stack_create");
+   pragma Import (C, Stack_Switch, "grt_stack_switch");
+   pragma Import (C, Stack_Delete, "grt_stack_delete");
+
+   pragma Export (C, Error_Grow_Failed, "grt_stack_error_grow_failed");
+   pragma Export (C, Error_Memory_Access, "grt_stack_error_memory_access");
+   pragma Export (C, Error_Null_Access, "grt_stack_error_null_access");
+end Grt.Stacks;