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exec_aout.c revision 1.4 
      1 /* $NetBSD: exec_aout.c,v 1.4 2000/06/14 06:49:26 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 #include <sys/cdefs.h>
     34 #ifndef lint
     35 __RCSID("$NetBSD: exec_aout.c,v 1.4 2000/06/14 06:49:26 cgd Exp $");
     36 #endif /* not lint */
     37 
     38 #include <sys/types.h>
     39 #include <stdio.h>
     40 #include <string.h>
     41 #include "extern.h"
     42 
     43 #if defined(NLIST_AOUT)
     44 #include <a.out.h>
     45 
     46 #define	check(off, size)	((off < 0) || (off + size > mappedsize))
     47 #define	BAD			do { rv = -1; goto out; } while (0)
     48 
     49 extern int	T_flag_specified;
     50 extern u_long	text_start;
     51 
     52 int
     53 check_aout(mappedfile, mappedsize)
     54 	const char *mappedfile;
     55 	size_t mappedsize;
     56 {
     57 	struct exec *execp;
     58 	int rv;
     59 
     60 	rv = 0;
     61 
     62 	if (check(0, sizeof *execp))
     63 		BAD;
     64 	execp = (struct exec *)&mappedfile[0];
     65 
     66 	if (N_BADMAG(*execp))
     67 		BAD;
     68 
     69 out:
     70 	return (rv);
     71 }
     72 
     73 int
     74 findoff_aout(mappedfile, mappedsize, vmaddr, fileoffp)
     75 	const char *mappedfile;
     76 	size_t mappedsize, *fileoffp;
     77 	u_long vmaddr;
     78 {
     79 	struct exec *execp;
     80 	int rv;
     81 
     82 	rv = 0;
     83 	execp = (struct exec *)&mappedfile[0];
     84 
     85 	if (N_TXTADDR(*execp) + (execp->a_entry & (N_PAGSIZ(*execp)-1)) !=
     86 	    execp->a_entry)
     87 		vmaddr += N_TXTADDR(*execp) +
     88 		    (execp->a_entry & (N_PAGSIZ(*execp)-1)) - execp->a_entry;
     89 
     90 	/* apply correction based on the supplied text start address, if any */
     91 	if (T_flag_specified)
     92 		vmaddr += N_TXTADDR(*execp) - text_start;
     93 
     94 	if (N_TXTADDR(*execp) <= vmaddr &&
     95 	    vmaddr < (N_TXTADDR(*execp) + execp->a_text))
     96 		*fileoffp = vmaddr - N_TXTADDR(*execp) + N_TXTOFF(*execp);
     97 	else if (N_DATADDR(*execp) <= vmaddr &&
     98 	    vmaddr < (N_DATADDR(*execp) + execp->a_data))
     99 		*fileoffp = vmaddr - N_DATADDR(*execp) + N_DATOFF(*execp);
    100 	else
    101 		BAD;
    102 
    103 out:
    104 	return (rv);
    105 }
    106 
    107 #endif /* NLIST_AOUT */
    108