FreeBSD/Linux Kernel Cross Reference
sys/lib/libsa/loadfile.c

     /* $NetBSD: loadfile.c,v 1.23 2003/08/07 16:32:27 agc Exp $ */
     
     /*-
      * Copyright (c) 1997 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * This code is derived from software contributed to The NetBSD Foundation
      * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
      * NASA Ames Research Center and by Christos Zoulas.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the NetBSD
     *      Foundation, Inc. and its contributors.
     * 4. Neither the name of The NetBSD Foundation nor the names of its
     *    contributors may be used to endorse or promote products derived
     *    from this software without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     * POSSIBILITY OF SUCH DAMAGE.
     */
    
    /*
     * Copyright (c) 1992, 1993
     *      The Regents of the University of California.  All rights reserved.
     *
     * This code is derived from software contributed to Berkeley by
     * Ralph Campbell.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)boot.c      8.1 (Berkeley) 6/10/93
     */
    
    #ifdef _STANDALONE
    #include <lib/libsa/stand.h>
    #include <lib/libkern/libkern.h>
    #else
    #include <stdio.h>
    #include <string.h>
    #include <errno.h>
    #include <stdlib.h>
    #include <unistd.h>
    #include <fcntl.h>
    #include <err.h>
    #endif
    
    #include <sys/param.h>
    #include <sys/exec.h>
    
    #include "loadfile.h"
    
    /*
     * Open 'filename', read in program and return the opened file
     * descriptor if ok, or -1 on error.
     * Fill in marks
     */
    int
    loadfile(fname, marks, flags)
            const char *fname;
           u_long *marks;
           int flags;
   {
           int fd, error;
   
           /* Open the file. */
           if ((fd = open(fname, 0)) < 0) {
                   WARN(("open %s", fname ? fname : "<default>"));
                   return (-1);
           }
   
           /* Load it; save the value of errno across the close() call */
           if ((error = fdloadfile(fd, marks, flags)) != 0) {
                   (void)close(fd);
                   errno = error;
                   return (-1);
           }
   
           return (fd);
   }
   
   /*
    * Read in program from the given file descriptor.
    * Return error code (0 on success).
    * Fill in marks.
    */
   int
   fdloadfile(fd, marks, flags)
           int fd;
           u_long *marks;
           int flags;
   {
           union {
   #ifdef BOOT_ECOFF
                   struct ecoff_exechdr coff;
   #endif
   #ifdef BOOT_ELF32
                   Elf32_Ehdr elf32;
   #endif
   #ifdef BOOT_ELF64
                   Elf64_Ehdr elf64;
   #endif
   #ifdef BOOT_AOUT
                   struct exec aout;
   #endif
           } hdr;
           ssize_t nr;
           int rval;
   
           /* Read the exec header. */
           if (lseek(fd, 0, SEEK_SET) == (off_t)-1)
                   goto err;
           if ((nr = read(fd, &hdr, sizeof(hdr))) != sizeof(hdr)) {
                   WARN(("read header"));
                   goto err;
           }
   
   #ifdef BOOT_ECOFF
           if (!ECOFF_BADMAG(&hdr.coff)) {
                   rval = loadfile_coff(fd, &hdr.coff, marks, flags);
           } else
   #endif
   #ifdef BOOT_ELF32
           if (memcmp(hdr.elf32.e_ident, ELFMAG, SELFMAG) == 0 &&
               hdr.elf32.e_ident[EI_CLASS] == ELFCLASS32) {
                   rval = loadfile_elf32(fd, &hdr.elf32, marks, flags);
           } else
   #endif
   #ifdef BOOT_ELF64
           if (memcmp(hdr.elf64.e_ident, ELFMAG, SELFMAG) == 0 &&
               hdr.elf64.e_ident[EI_CLASS] == ELFCLASS64) {
                   rval = loadfile_elf64(fd, &hdr.elf64, marks, flags);
           } else
   #endif
   #ifdef BOOT_AOUT
           if (OKMAGIC(N_GETMAGIC(hdr.aout))
   #ifndef NO_MID_CHECK
               && N_GETMID(hdr.aout) == MID_MACHINE
   #endif
               ) {
                   rval = loadfile_aout(fd, &hdr.aout, marks, flags);
           } else
   #endif
           {
                   rval = 1;
                   errno = EFTYPE;
           }
   
           if (rval == 0) {
                   if ((flags & LOAD_ALL) != 0)
                           PROGRESS(("=0x%lx\n",
                                     marks[MARK_END] - marks[MARK_START]));
                   return (0);
           }
   err:
           return (errno);
   }

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