exec.h revision 1817 
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 * $Id$
35 */
36
37#ifndef	_EXEC_H_
38#define	_EXEC_H_
39
40#define	__LDPGSZ	4096
41
42/* Valid magic number check. */
43#define	N_BADMAG(ex) \
44	(N_GETMAGIC(ex) != OMAGIC && N_GETMAGIC(ex) != NMAGIC && \
45	 N_GETMAGIC(ex) != ZMAGIC && N_GETMAGIC(ex) != QMAGIC && \
46	 N_GETMAGIC_NET(ex) != OMAGIC && N_GETMAGIC_NET(ex) != NMAGIC && \
47	 N_GETMAGIC_NET(ex) != ZMAGIC && N_GETMAGIC_NET(ex) != QMAGIC)
48
49#define N_ALIGN(ex,x) \
50	(N_GETMAGIC(ex) == ZMAGIC || N_GETMAGIC(ex) == QMAGIC || \
51	 N_GETMAGIC_NET(ex) == ZMAGIC || N_GETMAGIC_NET(ex) == QMAGIC ? \
52	 ((x) + __LDPGSZ - 1) & ~(__LDPGSZ - 1) : (x))
53
54/* Address of the bottom of the text segment. */
55#define N_TXTADDR(ex) \
56	((N_GETMAGIC(ex) == OMAGIC || N_GETMAGIC(ex) == NMAGIC || \
57	N_GETMAGIC(ex) == ZMAGIC) ? 0 : __LDPGSZ)
58
59/* Address of the bottom of the data segment. */
60#define N_DATADDR(ex) \
61	N_ALIGN(ex, N_TXTADDR(ex) + (ex).a_text)
62
63#define N_GETMAGIC(ex) \
64	( (ex).a_midmag & 0xffff )
65#define N_GETMID(ex) \
66	( (N_GETMAGIC_NET(ex) == ZMAGIC) ? N_GETMID_NET(ex) : \
67	((ex).a_midmag >> 16) & 0x03ff )
68#define N_GETFLAG(ex) \
69	( (N_GETMAGIC_NET(ex) == ZMAGIC) ? N_GETFLAG_NET(ex) : \
70	((ex).a_midmag >> 26) & 0x3f )
71#define N_SETMAGIC(ex,mag,mid,flag) \
72	( (ex).a_midmag = (((flag) & 0x3f) <<26) | (((mid) & 0x03ff) << 16) | \
73	((mag) & 0xffff) )
74
75#define N_GETMAGIC_NET(ex) \
76	(ntohl((ex).a_midmag) & 0xffff)
77#define N_GETMID_NET(ex) \
78	((ntohl((ex).a_midmag) >> 16) & 0x03ff)
79#define N_GETFLAG_NET(ex) \
80	((ntohl((ex).a_midmag) >> 26) & 0x3f)
81#define N_SETMAGIC_NET(ex,mag,mid,flag) \
82	( (ex).a_midmag = htonl( (((flag)&0x3f)<<26) | (((mid)&0x03ff)<<16) | \
83	(((mag)&0xffff)) ) )
84
85/* Text segment offset. */
86#define	N_TXTOFF(ex) \
87	(N_GETMAGIC(ex) == ZMAGIC ? __LDPGSZ : (N_GETMAGIC(ex) == QMAGIC || \
88	N_GETMAGIC_NET(ex) == ZMAGIC) ? 0 : sizeof(struct exec))
89
90/* Data segment offset. */
91#define	N_DATOFF(ex) \
92	N_ALIGN(ex, N_TXTOFF(ex) + (ex).a_text)
93
94/* Relocation table offset. */
95#define N_RELOFF(ex) \
96	N_ALIGN(ex, N_DATOFF(ex) + (ex).a_data)
97
98/* Symbol table offset. */
99#define N_SYMOFF(ex) \
100	(N_RELOFF(ex) + (ex).a_trsize + (ex).a_drsize)
101
102/* String table offset. */
103#define	N_STROFF(ex) 	(N_SYMOFF(ex) + (ex).a_syms)
104
105/*
106 * Header prepended to each a.out file.
107 * only manipulate the a_midmag field via the
108 * N_SETMAGIC/N_GET{MAGIC,MID,FLAG} macros in a.out.h
109 */
110
111struct exec {
112unsigned long  a_midmag;   /* htonl(flags<<26 | mid<<16 | magic) */
113unsigned long	a_text;		/* text segment size */
114unsigned long	a_data;		/* initialized data size */
115unsigned long	a_bss;		/* uninitialized data size */
116unsigned long	a_syms;		/* symbol table size */
117unsigned long	a_entry;	/* entry point */
118unsigned long	a_trsize;	/* text relocation size */
119unsigned long	a_drsize;	/* data relocation size */
120};
121#define a_magic a_midmag /* XXX Hack to work with current kern_execve.c */
122
123/* a_magic */
124#define	OMAGIC		0407	/* old impure format */
125#define	NMAGIC		0410	/* read-only text */
126#define	ZMAGIC		0413	/* demand load format */
127#define QMAGIC          0314    /* "compact" demand load format */
128
129#endif /* !_EXEC_H_ */
130