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exec_aout.c revision 1.1 
      1 /*	$NetBSD: exec_aout.c,v 1.1 1996/10/04 00:18:55 cgd 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 1.1 1996/10/04 00:18:55 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 int
     49 check_aout(mappedfile, mappedsize)
     50 	const char *mappedfile;
     51 	size_t mappedsize;
     52 {
     53 	struct exec *execp;
     54 	int rv;
     55 
     56 	rv = 0;
     57 
     58 	if (check(0, sizeof *execp))
     59 		BAD;
     60 	execp = (struct exec *)&mappedfile[0];
     61 
     62 	if (N_BADMAG(*execp))
     63 		BAD;
     64 
     65 out:
     66 	return (rv);
     67 }
     68 
     69 int
     70 findoff_aout(mappedfile, mappedsize, vmaddr, fileoffp)
     71 	const char *mappedfile;
     72 	size_t mappedsize, *fileoffp;
     73 	u_long vmaddr;
     74 {
     75 	struct exec *execp;
     76 	int rv;
     77 
     78 	rv = 0;
     79 	execp = (struct exec *)&mappedfile[0];
     80 
     81 	if (N_TXTADDR(*execp) + (execp->a_entry & (N_PAGSIZ(*execp)-1)) !=
     82 	    execp->a_entry)
     83 		vmaddr += N_TXTADDR(*execp) +
     84 		    (execp->a_entry & (N_PAGSIZ(*execp)-1)) - execp->a_entry;
     85 
     86 	if (N_TXTADDR(*execp) <= vmaddr &&
     87 	    vmaddr < (N_TXTADDR(*execp) + execp->a_text))
     88 		*fileoffp = vmaddr - N_TXTADDR(*execp) + N_TXTOFF(*execp);
     89 	else if (N_DATADDR(*execp) <= vmaddr &&
     90 	    vmaddr < (N_DATADDR(*execp) + execp->a_data))
     91 		*fileoffp = vmaddr - N_DATADDR(*execp) + N_DATOFF(*execp);
     92 	else
     93 		BAD;
     94 
     95 out:
     96 	return (rv);
     97 }
     98 
     99 #endif /* NLIST_AOUT */
    100