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[/] [or1k/] [trunk/] [rtems-20020807/] [c/] [src/] [lib/] [libbsp/] [unix/] [posix/] [startup/] [rtems-ctor.cc] - Blame information for rev 1765

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1 1026 ivang
/*
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 *  rtems-ctor.cc
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 *
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 *  Description:
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 *  This file exists solely to (try to) ensure RTEMS is initialized
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 *      before any global constructors are run.
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 *
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 *  The problem:
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 *      Global constructors might reasonably expect that new() will
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 *      work, but since new() uses malloc() which uses RTEMS regions,
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 *      it can not be called until after initialize_executive().
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 *
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 *      Global constructors are called in GNU systems one of 2 ways:
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 *
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 *              an "invisible" call to __main() inserted by compiler
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 *              This __main() calls __do_global_ctors() which
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 *              walks thru the table and calls all global
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 *              constructors.
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 *
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 *       or -
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 *              A special section is put into the linked binary.  The
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 *              system startup code knows to run the constructors in
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 *              this special section before calling main().
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 *
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 *      By making RTEMS initialization a constructor, we avoid having
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 *      too much about all this.  All we have to guarantee is that
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 *      this constructor is the first one run.
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 *
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 *
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 *  So for the first case above, this is what happens
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 *
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 *    host crt0
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 *      main()
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 *          __main()
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 *              __do_global_ctors()
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 *                  bsp_start()
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 *                      init_executive_early()
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 *                  <<any other constructors>>
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 *
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 *          init_executive_late()
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 *          bsp_cleanup()
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 *
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 *  TODO:
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 *
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 *  rtems-ctor.cc,v 1.7 1997/11/18 22:32:38 joel Exp
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 */
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#include <bsp.h>
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#include <stdio.h>
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#include <stdlib.h>
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/*
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 * RTEMS program name
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 * Probably not used by anyone, but it is nice to have it.
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 * Actually the UNIX version of CPU_INVOKE_DEBUGGER will probably
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 * need to use it
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 */
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char *rtems_progname;
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class RTEMS {
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    public:
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         RTEMS();
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        ~RTEMS();
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};
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RTEMS  rtems_constructor;
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RTEMS::RTEMS()
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{
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    bsp_start();
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}
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RTEMS::~RTEMS()
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{
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    bsp_cleanup();
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}
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extern "C" {
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    extern void invoke_non_gnu_constructors(void);
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    int
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    main(int argc,
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         char **argv,
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         char ** /* environp is unused */)
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    {
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        rtems_argc = argc;
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        rtems_argv = argv;
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        if ((argc > 0) && argv && argv[0])
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            rtems_progname = argv[0];
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        else
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            rtems_progname = "RTEMS";
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        /*
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         * run any non-gnu constructors we may need
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         */
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        invoke_non_gnu_constructors();
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        /*
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         *  Start multitasking
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         */
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        rtems_initialize_executive_late( bsp_isr_level );
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        /*
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         * Returns when multitasking is stopped
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         * This allows our destructors to get run normally
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         */
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        fflush( stdout );
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        fflush( stderr );
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        return 0;
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    }
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}

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