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

//

//      dload.cxx

//

//      Dynamic loader API

//

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

//####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):           nickg

// Contributors:        nickg

// Date:                2000-11-03

// Purpose:             Loader class implementation

// Description:         This file contains the dynamic ELF loader API.

//                      This presents the standard dlxxx() calls by invoking

//                      the loader classes as appropriate.

//              

//              

//

//####DESCRIPTIONEND####

//

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

#include <pkgconf/hal.h>

#include <pkgconf/kernel.h>

#include <pkgconf/isoinfra.h>

#include <cyg/kernel/ktypes.h>          // base kernel types

#include <cyg/infra/cyg_trac.h>         // tracing macros

#include <cyg/infra/cyg_ass.h>          // assertion macros

#include <string.h>

#include <cyg/loader/loader.hxx>        // Loader header

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <unistd.h>

#include <dlfcn.h>                      // API definitions

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

// Cyg_LoaderStream_File class

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

// API calls

cyg_uint32 global_symbol_object;

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

// Load and open object

__externC void *dlopen (const char *file, int mode)

{

    CYG_REPORT_FUNCTION();

    void *ret = NULL;

    if( file == NULL )

    {

        // Special case to allow access to all symbols.

        ret = (void *)&global_symbol_object;

    }

#ifdef CYGPKG_IO_FILEIO    

    else

    {

        int fd = open( file, O_RDONLY );

        if( fd < 0 )

            return NULL;

        Cyg_LoaderStream_File filestream( fd );

        Cyg_LoadObject *obj;

        cyg_code error = Cyg_Loader::loader->load( filestream, mode, &obj );

        if( error == 0)

        {

            ret = (void *)obj;

        }

        close( fd );

    }

#endif

    CYG_REPORT_RETVAL(ret);

    return ret;

}

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

__externC void *dlopenmem(const void *addr, size_t size, int mode)

{

    CYG_REPORT_FUNCTION();

    void *ret = NULL;

    Cyg_LoaderStream_Mem memstream( addr, size );

    Cyg_LoadObject *obj;

    cyg_code error = Cyg_Loader::loader->load( memstream, mode, &obj );

    if( error == 0)

        ret = (void *)obj;

    CYG_REPORT_RETVAL(ret);

    return ret;

}

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

__externC int dlclose (void *handle)

{

    CYG_REPORT_FUNCTION();

    int ret = 0;

    if( handle == (void *)global_symbol_object )

    {

        // Nothing to do here...

    }

    else

    {

        Cyg_LoadObject *obj = (Cyg_LoadObject *)handle;

        Cyg_Loader::loader->close( obj );

    }

    CYG_REPORT_RETVAL(ret);

    return ret;

}

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

__externC void *dlsym (void *handle, const char *name)

{

    CYG_REPORT_FUNCTION();

    void *ret = NULL;

    Cyg_LoadObject *obj = (Cyg_LoadObject *)handle;

    ret = obj->symbol( name );

    CYG_REPORT_RETVAL(ret);

    return ret;

}

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

__externC const char *dlerror (void)

{

    CYG_REPORT_FUNCTION();

    const char *ret = Cyg_Loader::loader->error_string();

    CYG_REPORT_RETVAL(ret);

    return ret;

}

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

// EOF dload.cxx