Subversion Repositories openrisc_2011-10-31

//=======================================================================

//

//      main.cxx

//

//      Default main() function

//

//========================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

//

// eCos 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.

//

// eCos 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 eCos; if not, write to the Free Software Foundation, Inc.,

// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

//

// As a special exception, if other files instantiate templates or use macros

// or inline functions from this file, or you compile this file and link it

// with other works to produce a work based on this file, this file does not

// by itself cause the resulting work to be covered by the GNU General Public

// License. However the source code for this file must still be made available

// in accordance with section (3) of the GNU General Public License.

//

// This exception does not invalidate any other reasons why a work based on

// this file might be covered by the GNU General Public License.

//

// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.

// at http://sources.redhat.com/ecos/ecos-license/

// -------------------------------------------

//####ECOSGPLCOPYRIGHTEND####

//========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):     jlarmour

// Contributors:  

// Date:          2000-04-30

// Purpose:       Provide a default empty main() function

// Description:   This file provides a default empty main() function so

//                that things don't fall apart if the user starts the

//                ISO C environment (the default setting) but doesn't

//                provide their own main(). This is taken advantage of

//                in some tests (for example)

// Usage:         Obviously simply override main() in your own program to

//                prevent the use of the one below

//

//####DESCRIPTIONEND####

//

//========================================================================

// CONFIGURATION

#include <pkgconf/system.h>        // for CYGPKG_KERNEL

// INCLUDES

#include <cyg/infra/cyg_type.h>    // Common type definitions and support

#include <cyg/infra/cyg_trac.h>    // Common tracing support

#include <cyg/infra/cyg_ass.h>     // Common assertion support

// FUNCTION PROTOTYPES

// We provide a weakly named main to allow this to link if the user

// doesn't provide their own main. This isn't strictly good behaviour,

// but if the user wants good performance then of _course_ they should

// play with the config options and this won't be called. Or it might

// be "giving them enough rope" etc. :-)

externC int

main( int argc, char *argv[] ) __attribute__((weak));

externC void

cyg_user_start(void);

// FUNCTIONS

externC int

main( int argc, char *argv[] )

{

    CYG_REPORT_FUNCNAMETYPE("main", "returning %d" );

    // try to be helpful by diagnosing malformed arguments

    CYG_PRECONDITION( argv != NULL, "argv is NULL!" );

    CYG_PRECONDITION( argv[argc] == NULL, "argv[argc] isn't NULL!" );

    CYG_REPORT_FUNCARG2("argc=%d, argv[0]=%s", argc,

                        (CYG_ADDRWORD)((argv[0]==NULL) ? "NULL" : argv[0]) );

    CYG_TRACE0( true, "This is the system-supplied default main()" );

    // If the kernel isn't present then cyg_libc_invoke_main() will have assumed

    // main() is present and will call it. But if we're here, then

    // evidently the user didn't supply one - which can't be right. So we

    // assume that they have useful code to run in cyg_user_start() instead.

    // Its better than just exiting

#ifndef CYGPKG_KERNEL

    cyg_user_start();

#endif

    CYG_REPORT_RETVAL(0);

    return 0; // some CPUs have 0 hard-wired - faster than a reg

} // main()

// EOF main.cxx