sys/compat/freebsd/freebsd_exec_aout.c

   1 /*      $NetBSD: freebsd_exec_aout.c,v 1.8 2007/12/08 18:35:58 dsl Exp $        */
   2
   3 /*
   4  * Copyright (c) 1993, 1994 Christopher G. Demetriou
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by Christopher G. Demetriou.
  18  * 4. The name of the author may not be used to endorse or promote products
  19  *    derived from this software without specific prior written permission
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __KERNEL_RCSID(0, "$NetBSD: freebsd_exec_aout.c,v 1.8 2007/12/08 18:35:58 dsl Exp $");
  35
  36 #include <sys/param.h>
  37 #include <sys/systm.h>
  38 #include <sys/proc.h>
  39 #include <sys/exec.h>
  40 #include <sys/exec_aout.h>
  41
  42 #ifndef EXEC_AOUT
  43 #define EXEC_AOUT       /* to get a.out specific stuff */
  44 #endif
  45
  46 #include <compat/freebsd/freebsd_exec.h>
  47
  48 /*
  49 * exec_aout_makecmds(): Check if it's an a.out-format executable.
  50 *
  51 * Given a lwp pointer and an exec package pointer, see if the referent
  52 * of the epp is in a.out format.  First check 'standard' magic numbers for
  53 * this architecture.  If that fails, try a CPU-dependent hook.
  54  *
  55  * This function, in the former case, or the hook, in the latter, is
  56  * responsible for creating a set of vmcmds which can be used to build
  57  * the process's vm space and inserting them into the exec package.
  58  */
  59
  60 int
  61 exec_freebsd_aout_makecmds(struct lwp *l, struct exec_package *epp)
  62 {
  63         u_long midmag;
  64         int error = ENOEXEC;
  65         struct exec *execp = epp->ep_hdr;
  66
  67         if (epp->ep_hdrvalid < sizeof(struct exec))
  68                 return ENOEXEC;
  69
  70         midmag = FREEBSD_N_GETMID(*execp) << 16 | FREEBSD_N_GETMAGIC(*execp);
  71
  72         /* assume FreeBSD's MID_MACHINE and [ZQNO]MAGIC is same as NetBSD's */
  73         switch (midmag) {
  74         case (MID_MACHINE << 16) | ZMAGIC:
  75                 error = exec_aout_prep_oldzmagic(l, epp);
  76                 break;
  77         case (MID_MACHINE << 16) | QMAGIC:
  78                 error = exec_aout_prep_zmagic(l, epp);
  79                 break;
  80         case (MID_MACHINE << 16) | NMAGIC:
  81                 error = exec_aout_prep_nmagic(l, epp);
  82                 break;
  83         case (MID_MACHINE << 16) | OMAGIC:
  84                 error = exec_aout_prep_omagic(l, epp);
  85                 break;
  86         }
  87         if (error)
  88                 kill_vmcmds(&epp->ep_vmcmds);
  89
  90         return error;
  91 }