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diff --git a/src/ortho/mcode/ortho_code-x86-abi.ads b/src/ortho/mcode/ortho_code-x86-abi.ads
new file mode 100644
index 000000000..7b166dad8
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+++ b/src/ortho/mcode/ortho_code-x86-abi.ads
@@ -0,0 +1,76 @@
+--  X86 ABI definitions.
+--  Copyright (C) 2006 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 Ortho_Code.Types; use Ortho_Code.Types;
+
+package Ortho_Code.X86.Abi is
+   type O_Abi_Subprg is private;
+
+   procedure Init;
+   procedure Finish;
+
+   Mode_Align : Mode_Align_Array :=
+     (Mode_U8 | Mode_I8 => 0,
+      Mode_U16 | Mode_I16 => 1,
+      Mode_U32 | Mode_I32 | Mode_F32 | Mode_P32 => 2,
+      Mode_U64 | Mode_I64 => 2,
+      Mode_F64 => 2, -- 2 for SVR4-ABI and Darwin, 3 for Windows.
+      Mode_Blk | Mode_X1 | Mode_Nil | Mode_P64 => 0,
+      Mode_B2 => 0);
+
+   Mode_Ptr : constant Mode_Type := Mode_P32;
+
+   Flag_Type_Completer : constant Boolean := False;
+   Flag_Lower_Stmt : constant Boolean := True;
+
+   Flag_Sse2 : Boolean := False;
+
+   --  Procedures to layout a subprogram declaration.
+   procedure Start_Subprogram (Subprg : O_Dnode; Abi : out O_Abi_Subprg);
+   procedure New_Interface (Inter : O_Dnode; Abi : in out O_Abi_Subprg);
+   procedure Finish_Subprogram (Subprg : O_Dnode; Abi : in out O_Abi_Subprg);
+
+   --  Only called for top-level subprograms.
+   procedure Start_Body (Subprg : O_Dnode);
+   --  Finish compilation of a body.
+   procedure Finish_Body (Subprg : Subprogram_Data_Acc);
+
+   procedure Expand_Const_Decl (Decl : O_Dnode);
+   procedure Expand_Var_Decl (Decl : O_Dnode);
+   procedure Expand_Const_Value (Decl : O_Dnode; Val : O_Cnode);
+
+   procedure New_Debug_Filename_Decl (Filename : String);
+
+   Last_Link : O_Enode;
+   procedure Link_Stmt (Stmt : O_Enode);
+
+   --  Disp SUBPRG (subprg declaration) as a declaration (name and interfaces).
+   procedure Disp_Subprg_Decl (Decl : O_Dnode);
+
+   procedure Disp_Stmt (Stmt : O_Enode);
+
+   --function Image_Insn (Insn : O_Insn) return String;
+   function Image_Reg (Reg : O_Reg) return String;
+
+   --  Link in memory intrinsics symbols.
+   procedure Link_Intrinsics;
+private
+   type O_Abi_Subprg is record
+      --  For x86: offset of the next argument.
+      Offset : Int32 := 0;
+   end record;
+end Ortho_Code.X86.Abi;