Subversion Repositories openrisc

/* =================================================================

 *

 *      loader_memory.c

 *

 *      Routines to read a library from memory.

 *

 * =================================================================

 * ####ECOSGPLCOPYRIGHTBEGIN####

 * -------------------------------------------

 * This file is part of eCos, the Embedded Configurable Operating

 * System.

 * Copyright (C) 2006, 2008 Free Software Foundation, 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.

 *

 * -------------------------------------------

 * ####ECOSGPLCOPYRIGHTEND####

 * =================================================================

 * #####DESCRIPTIONBEGIN####

 *

 *  Author(s):    Gernot Zankl zankl@decomsys.com

 *  Contributors:

 *  Date:         2006-11-21

 *  Purpose:

 *  Description:

 *

 * ####DESCRIPTIONEND####

 *

 * =================================================================

 */

#include <cyg/infra/diag.h>     // For diagnostic printing.

#include <cyg/infra/cyg_ass.h>  // CYG_ASSERT

#include <stdio.h>

#include <stdlib.h>

#include <pkgconf/objloader.h>

#include <cyg/objloader/elf.h>

#include <cyg/objloader/objelf.h>

#include <cyg/objloader/loader_memory.h>

typedef struct

{

    CYG_ADDRWORD nBufferBase;

    cyg_uint32   nOffset;

} ObjLoader_MemInfoType;

static size_t

cyg_ldr_memory_read(PELF_OBJECT p, size_t s, size_t n, void *mem)

{

    ObjLoader_MemInfoType * const pMemInfo = (ObjLoader_MemInfoType *)p->ptr;

    cyg_uint8 * const pSource =

        (cyg_uint8 *)pMemInfo->nBufferBase + pMemInfo->nOffset;

    memcpy(mem, (void*)pSource, s*n);

    return n;

}

static cyg_int32

cyg_ldr_memory_seek(PELF_OBJECT p, cyg_uint32 offs)

{

    ObjLoader_MemInfoType * const pMemInfo = (ObjLoader_MemInfoType *)p->ptr;

    pMemInfo->nOffset = offs;

    return 0;

}

static cyg_int32

cyg_ldr_memory_close(PELF_OBJECT p)

{

    return 0;

}

PELF_OBJECT

cyg_ldr_open_library_memory(CYG_ADDRWORD ptr)

{

    PELF_OBJECT  e_obj;

    ObjLoader_MemInfoType * pMemInfo;

    if (ptr == 0)

    {

        cyg_ldr_last_error = "ERROR INVALID POINTER";

        return (void*)0;

    }

    // Create a file object to keep track of this library.

    e_obj = (PELF_OBJECT)malloc(sizeof(ELF_OBJECT));

    CYG_ASSERT(e_obj != 0, "Cannot malloc() e_obj");

    if (e_obj == 0)

    {

        cyg_ldr_last_error = "ERROR IN MALLOC";

        return (void*)0;

    }

    memset(e_obj, 0, sizeof(ELF_OBJECT));

    pMemInfo = (ObjLoader_MemInfoType *)malloc(sizeof(ObjLoader_MemInfoType));

    CYG_ASSERT(pMemInfo != 0, "Cannot malloc() pMemInfo");

    if (pMemInfo == 0)

    {

        cyg_ldr_last_error = "ERROR IN MALLOC";

        return (void*)0;

    }

    pMemInfo->nBufferBase = ptr;

    pMemInfo->nOffset = 0;

    e_obj->ptr   = (CYG_ADDRWORD)pMemInfo;

    e_obj->mode  = CYG_LDR_MODE_MEMORY;

    // Handlers for the file system open.

    e_obj->read  = cyg_ldr_memory_read;

    e_obj->seek  = cyg_ldr_memory_seek;

    e_obj->close = cyg_ldr_memory_close;

    return e_obj;

}

void

cyg_ldr_close_library_memory(PELF_OBJECT p)

{

    free((ObjLoader_MemInfoType *) p->ptr);

}