exec.h revision 1543 
1/*-
2 * Copyright (c) 1992, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 *	@(#)exec.h	8.1 (Berkeley) 6/11/93
34 */
35
36/* Size of a page in an object file. */
37#define	__LDPGSZ	4096
38
39/* Valid magic number check. */
40#define	N_BADMAG(ex) \
41	((ex).a_magic != NMAGIC && (ex).a_magic != OMAGIC && \
42	    (ex).a_magic != ZMAGIC)
43
44/* Address of the bottom of the text segment. */
45#define N_TXTADDR(X)	0
46
47/* Address of the bottom of the data segment. */
48#define N_DATADDR(ex) \
49	(N_TXTADDR(ex) + ((ex).a_magic == OMAGIC ? (ex).a_text \
50	: __LDPGSZ + ((ex).a_text - 1 & ~(__LDPGSZ - 1))))
51
52/* Text segment offset. */
53#define	N_TXTOFF(ex) \
54	((ex).a_magic == ZMAGIC ? __LDPGSZ : sizeof(struct exec))
55
56/* Data segment offset. */
57#define	N_DATOFF(ex) \
58	(N_TXTOFF(ex) + ((ex).a_magic != ZMAGIC ? (ex).a_text : \
59	__LDPGSZ + ((ex).a_text - 1 & ~(__LDPGSZ - 1))))
60
61/* Symbol table offset. */
62#define N_SYMOFF(ex) \
63	(N_TXTOFF(ex) + (ex).a_text + (ex).a_data + (ex).a_trsize + \
64	    (ex).a_drsize)
65
66/* String table offset. */
67#define	N_STROFF(ex) 	(N_SYMOFF(ex) + (ex).a_syms)
68
69/* Description of the object file header (a.out format). */
70struct exec {
71#define	OMAGIC	0407		/* old impure format */
72#define	NMAGIC	0410		/* read-only text */
73#define	ZMAGIC	0413		/* demand load format */
74	long	a_magic;	/* magic number */
75
76	u_long	a_text;		/* text segment size */
77	u_long	a_data;		/* initialized data size */
78	u_long	a_bss;		/* uninitialized data size */
79	u_long	a_syms;		/* symbol table size */
80	u_long	a_entry;	/* entry point */
81	u_long	a_trsize;	/* text relocation size */
82	u_long	a_drsize;	/* data relocation size */
83};
84