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exec_aout.c revision 1.2 
      1 /*	$NetBSD: exec_aout.c,v 1.2 1997/09/30 06:20:16 scottr Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1996 Christopher G. Demetriou.  All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. All advertising materials mentioning features or use of this software
     15  *    must display the following acknowledgement:
     16  *      This product includes software developed by Christopher G. Demetriou
     17  *	for the NetBSD Project.
     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 #ifndef lint
     34 static char *rcsid = "$NetBSD: exec_aout.c,v 1.2 1997/09/30 06:20:16 scottr 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 	struct exec *execp;
     57 	int rv;
     58 
     59 	rv = 0;
     60 
     61 	if (check(0, sizeof *execp))
     62 		BAD;
     63 	execp = (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 	struct exec *execp;
     79 	int rv;
     80 
     81 	rv = 0;
     82 	execp = (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 */
    107