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exec_aout.c revision 1.3.10.1 
      1 /* $NetBSD: exec_aout.c,v 1.3.10.1 2000/06/22 18:01:03 minoura 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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *          This product includes software developed for the
     18  *          NetBSD Project.  See http://www.netbsd.org/ for
     19  *          information about NetBSD.
     20  * 4. The name of the author may not be used to endorse or promote products
     21  *    derived from this software without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     33  *
     34  * <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
     35  */
     36 
     37 #include <sys/cdefs.h>
     38 #ifndef lint
     39 __RCSID("$NetBSD: exec_aout.c,v 1.3.10.1 2000/06/22 18:01:03 minoura Exp $");
     40 #endif /* not lint */
     41 
     42 #include <sys/types.h>
     43 #include <stdio.h>
     44 #include <string.h>
     45 #include "extern.h"
     46 
     47 #if defined(NLIST_AOUT)
     48 #include <a.out.h>
     49 
     50 #define	check(off, size)	((off < 0) || (off + size > mappedsize))
     51 #define	BAD			do { rv = -1; goto out; } while (0)
     52 
     53 extern int	T_flag_specified;
     54 extern u_long	text_start;
     55 
     56 int
     57 check_aout(mappedfile, mappedsize)
     58 	const char *mappedfile;
     59 	size_t mappedsize;
     60 {
     61 	struct exec *execp;
     62 	int rv;
     63 
     64 	rv = 0;
     65 
     66 	if (check(0, sizeof *execp))
     67 		BAD;
     68 	execp = (struct exec *)&mappedfile[0];
     69 
     70 	if (N_BADMAG(*execp))
     71 		BAD;
     72 
     73 out:
     74 	return (rv);
     75 }
     76 
     77 int
     78 findoff_aout(mappedfile, mappedsize, vmaddr, fileoffp)
     79 	const char *mappedfile;
     80 	size_t mappedsize, *fileoffp;
     81 	u_long vmaddr;
     82 {
     83 	struct exec *execp;
     84 	int rv;
     85 
     86 	rv = 0;
     87 	execp = (struct exec *)&mappedfile[0];
     88 
     89 	if (N_TXTADDR(*execp) + (execp->a_entry & (N_PAGSIZ(*execp)-1)) !=
     90 	    execp->a_entry)
     91 		vmaddr += N_TXTADDR(*execp) +
     92 		    (execp->a_entry & (N_PAGSIZ(*execp)-1)) - execp->a_entry;
     93 
     94 	/* apply correction based on the supplied text start address, if any */
     95 	if (T_flag_specified)
     96 		vmaddr += N_TXTADDR(*execp) - text_start;
     97 
     98 	if (N_TXTADDR(*execp) <= vmaddr &&
     99 	    vmaddr < (N_TXTADDR(*execp) + execp->a_text))
    100 		*fileoffp = vmaddr - N_TXTADDR(*execp) + N_TXTOFF(*execp);
    101 	else if (N_DATADDR(*execp) <= vmaddr &&
    102 	    vmaddr < (N_DATADDR(*execp) + execp->a_data))
    103 		*fileoffp = vmaddr - N_DATADDR(*execp) + N_DATOFF(*execp);
    104 	else
    105 		BAD;
    106 
    107 out:
    108 	return (rv);
    109 }
    110 
    111 #endif /* NLIST_AOUT */
    112