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load_elf64.c revision 1.2
      1 /*	$NetBSD: load_elf64.c,v 1.1 2006/04/07 14:21:29 cherry Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1998 Michael Smith <msmith (at) freebsd.org>
      5  * Copyright (c) 1998 Peter Wemm <peter (at) freebsd.org>
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     27  * SUCH DAMAGE.
     28  */
     29 
     30 #include <sys/cdefs.h>
     31 /* __FBSDID("$FreeBSD: src/sys/boot/common/load_elf.c,v 1.30.2.1 2004/09/03 19:25:40 iedowse Exp $"); */
     32 
     33 #include <sys/param.h>
     34 #include <sys/exec.h>
     35 
     36 #include <lib/libsa/stand.h>
     37 #include <lib/libsa/loadfile.h>
     38 
     39 #include "bootstrap.h"
     40 
     41 #ifdef BOOT_ELF64
     42 
     43 /*
     44  * Attempt to load the file (file) as an ELF module.  It will be stored at
     45  * (dest), and a pointer to a module structure describing the loaded object
     46  * will be saved in (result).
     47  */
     48 int
     49 elf64_loadfile(char *filename, u_int64_t dest, struct preloaded_file **result)
     50 {
     51     struct preloaded_file	*fp;
     52     u_long                      *marks;
     53     int				err;
     54     u_int			pad;
     55     ssize_t			bytes_read;
     56     int                         fd;
     57 
     58     /*
     59      * Open the image, read and validate the ELF header
     60      */
     61     if (filename == NULL)	/* can't handle nameless */
     62 	return(EFTYPE);
     63 
     64     fp = file_alloc();
     65     marks = fp->marks;
     66 
     67     if (fp == NULL) {
     68 	    printf("elf64_loadfile: cannot allocate module info\n");
     69 	    err = EPERM;
     70 	    goto out;
     71     }
     72 
     73     fp->f_name = strdup(filename);
     74     fp->f_type = strdup(ELF64_KERNELTYPE);
     75 
     76     marks[MARK_START] = dest;
     77 
     78     if ((fd = loadfile(filename, marks, LOAD_KERNEL)) == -1)
     79 	    goto oerr;
     80     close(fd);
     81 
     82     dest = marks[MARK_ENTRY];
     83 
     84     printf("%s entry at 0x%lx\n", filename, (uintmax_t)dest);
     85 
     86     fp->f_size = marks[MARK_END] - marks[MARK_START];
     87     fp->f_addr = marks[MARK_START];
     88 
     89     if (fp->f_size == 0 || fp->f_addr == 0)
     90 	goto ioerr;
     91 
     92     /* Load OK, return module pointer */
     93     *result = fp;
     94     err = 0;
     95     goto out;
     96 
     97  ioerr:
     98     err = EIO;
     99  oerr:
    100     file_discard(fp);
    101  out:
    102     return(err);
    103 }
    104 
    105 #endif /*BOOT_ELF64*/
    106