exec_aout.c revision 1.3 
1/*	$NetBSD: exec_aout.c,v 1.3 1997/10/17 10:28:21 lukem 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 1.3 1997/10/17 10:28:21 lukem 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
49extern int	T_flag_specified;
50extern u_long	text_start;
51
52int
53check_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
69out:
70	return (rv);
71}
72
73int
74findoff_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
103out:
104	return (rv);
105}
106
107#endif /* NLIST_AOUT */
108