Subversion Repositories openrisc_2011-10-31

/*

 *  rtems-ctor.cc

 *

 *  Description:

 *  This file exists solely to (try to) ensure RTEMS is initialized

 *      before any global constructors are run.

 *

 *  The problem:

 *      Global constructors might reasonably expect that new() will

 *      work, but since new() uses malloc() which uses RTEMS regions,

 *      it can not be called until after initialize_executive().

 *

 *      Global constructors are called in GNU systems one of 2 ways:

 *

 *              an "invisible" call to __main() inserted by compiler

 *              This __main() calls __do_global_ctors() which

 *              walks thru the table and calls all global

 *              constructors.

 *

 *       or -

 *              A special section is put into the linked binary.  The

 *              system startup code knows to run the constructors in

 *              this special section before calling main().

 *

 *      By making RTEMS initialization a constructor, we avoid having

 *      too much about all this.  All we have to guarantee is that

 *      this constructor is the first one run.

 *

 *

 *  So for the first case above, this is what happens

 *

 *    host crt0

 *      main()

 *          __main()

 *              __do_global_ctors()

 *                  bsp_start()

 *                      init_executive_early()

 *                  <<any other constructors>>

 *

 *          init_executive_late()

 *          bsp_cleanup()

 *

 *  TODO:

 *

 *  $Id: rtems-ctor.cc,v 1.2 2001-09-27 12:01:15 chris Exp $

 */

#include <bsp.h>

#include <stdio.h>

#include <stdlib.h>

/*

 * RTEMS program name

 * Probably not used by anyone, but it is nice to have it.

 * Actually the UNIX version of CPU_INVOKE_DEBUGGER will probably

 * need to use it

 */

char *rtems_progname;

class RTEMS {

    public:

         RTEMS();

        ~RTEMS();

};

RTEMS  rtems_constructor;

RTEMS::RTEMS()

{

    bsp_start();

}

RTEMS::~RTEMS()

{

    bsp_cleanup();

}

extern "C" {

    extern void invoke_non_gnu_constructors(void);

    int

    main(int argc,

         char **argv,

         char ** /* environp is unused */)

    {

        rtems_argc = argc;

        rtems_argv = argv;

        if ((argc > 0) && argv && argv[0])

            rtems_progname = argv[0];

        else

            rtems_progname = "RTEMS";

        /*

         * run any non-gnu constructors we may need

         */

        invoke_non_gnu_constructors();

        /*

         *  Start multitasking

         */

        rtems_initialize_executive_late( bsp_isr_level );

        /*

         * Returns when multitasking is stopped

         * This allows our destructors to get run normally

         */

        fflush( stdout );

        fflush( stderr );

        return 0;

    }

}