usr.sbin/mdsetimage/exec_aout.c

   1 /* $NetBSD: exec_aout.c,v 1.6 2001/10/01 23:32:34 cgd Exp $ */
   2
   3 /*
   4  * Copyright (c) 1996 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. The name of the author may not be used to endorse or promote products
  16  *    derived from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  *
  29  * <<Id: LICENSE_GC,v 1.1 2001/10/01 23:24:05 cgd Exp>>
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 __RCSID("$NetBSD: exec_aout.c,v 1.6 2001/10/01 23:32:34 cgd Exp $");
  35 #endif /* not lint */
  36
  37 #include <sys/types.h>
  38 #include <stdio.h>
  39 #include <string.h>
  40 #include "extern.h"
  41
  42 #if defined(NLIST_AOUT)
  43 #include <a.out.h>
  44
  45 #define check(off, size)        ((off < 0) || (off + size > mappedsize))
  46 #define BAD                     do { rv = -1; goto out; } while (0)
  47
  48 extern int      T_flag_specified;
  49 extern u_long   text_start;
  50
  51 int
  52 check_aout(mappedfile, mappedsize)
  53         const char *mappedfile;
  54         size_t mappedsize;
  55 {
  56         const struct exec *execp;
  57         int rv;
  58
  59         rv = 0;
  60
  61         if (check(0, sizeof *execp))
  62                 BAD;
  63         execp = (const struct exec *)&mappedfile[0];
  64
  65         if (N_BADMAG(*execp))
  66                 BAD;
  67
  68 out:
  69         return (rv);
  70 }
  71
  72 int
  73 findoff_aout(mappedfile, mappedsize, vmaddr, fileoffp)
  74         const char *mappedfile;
  75         size_t mappedsize, *fileoffp;
  76         u_long vmaddr;
  77 {
  78         const struct exec *execp;
  79         int rv;
  80
  81         rv = 0;
  82         execp = (const struct exec *)&mappedfile[0];
  83
  84         if (N_TXTADDR(*execp) + (execp->a_entry & (N_PAGSIZ(*execp)-1)) !=
  85             execp->a_entry)
  86                 vmaddr += N_TXTADDR(*execp) +
  87                     (execp->a_entry & (N_PAGSIZ(*execp)-1)) - execp->a_entry;
  88
  89         /* apply correction based on the supplied text start address, if any */
  90         if (T_flag_specified)
  91                 vmaddr += N_TXTADDR(*execp) - text_start;
  92
  93         if (N_TXTADDR(*execp) <= vmaddr &&
  94             vmaddr < (N_TXTADDR(*execp) + execp->a_text))
  95                 *fileoffp = vmaddr - N_TXTADDR(*execp) + N_TXTOFF(*execp);
  96         else if (N_DATADDR(*execp) <= vmaddr &&
  97             vmaddr < (N_DATADDR(*execp) + execp->a_data))
  98                 *fileoffp = vmaddr - N_DATADDR(*execp) + N_DATOFF(*execp);
  99         else
 100                 BAD;
 101
 102 out:
 103         return (rv);
 104 }
 105
 106 #endif /* NLIST_AOUT */