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------------------------------------------------------------------------------ -- -- -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- -- -- -- S Y S T E M . S T A C K _ C H E C K I N G -- -- -- -- S p e c -- -- -- -- Copyright (C) 1999-2009, Free Software Foundation, Inc. -- -- -- -- GNARL 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/>. -- -- -- -- GNARL was developed by the GNARL team at Florida State University. -- -- Extensive contributions were provided by Ada Core Technologies, Inc. -- -- -- ------------------------------------------------------------------------------ -- This package provides a system-independent implementation of stack -- checking using comparison with stack base and limit. -- This package defines basic types and objects. Operations related to -- stack checking can be found in package System.Stack_Checking.Operations. pragma Compiler_Unit; with System.Storage_Elements; package System.Stack_Checking is pragma Preelaborate; pragma Elaborate_Body; -- This unit has a junk null body. The reason is that historically we -- used to have a real body, and it causes bootstrapping path problems -- to eliminate it, since the old body may still be present in the -- compilation environment for a build. type Stack_Info is record Limit : System.Address := System.Null_Address; Base : System.Address := System.Null_Address; Size : System.Storage_Elements.Storage_Offset := 0; end record; -- This record may be part of a larger data structure like the -- task control block in the tasking case. -- This specific layout has the advantage of being compatible with the -- Intel x86 BOUNDS instruction. type Stack_Access is access all Stack_Info; -- Unique local storage associated with a specific task. This storage is -- used for the stack base and limit, and is returned by Checked_Self. -- Only self may write this information, it may be read by any task. -- At no time the address range Limit .. Base (or Base .. Limit for -- upgrowing stack) may contain any address that is part of another stack. -- The Stack_Access may be part of a larger data structure. Multi_Processor : constant Boolean := False; -- Not supported yet private Null_Stack_Info : aliased Stack_Info := (Limit => System.Null_Address, Base => System.Null_Address, Size => 0); -- Use explicit assignment to avoid elaboration code (call to init proc) Null_Stack : constant Stack_Access := Null_Stack_Info'Access; -- Stack_Access value that will return a Stack_Base and Stack_Limit -- that fail any stack check. end System.Stack_Checking;