exec.h revision 1549 
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#ifndef	_EXEC_H_
37#define	_EXEC_H_
38
39#define	__LDPGSZ	4096
40
41/* Valid magic number check. */
42#define	N_BADMAG(ex) \
43	(N_GETMAGIC(ex) != OMAGIC && N_GETMAGIC(ex) != NMAGIC && \
44	 N_GETMAGIC(ex) != ZMAGIC && N_GETMAGIC(ex) != QMAGIC && \
45	 N_GETMAGIC_NET(ex) != OMAGIC && N_GETMAGIC_NET(ex) != NMAGIC && \
46	 N_GETMAGIC_NET(ex) != ZMAGIC && N_GETMAGIC_NET(ex) != QMAGIC)
47
48#define N_ALIGN(ex,x) \
49	(N_GETMAGIC(ex) == ZMAGIC || N_GETMAGIC(ex) == QMAGIC || \
50	 N_GETMAGIC_NET(ex) == ZMAGIC || N_GETMAGIC_NET(ex) == QMAGIC ? \
51	 ((x) + __LDPGSZ - 1) & ~(__LDPGSZ - 1) : (x))
52
53/* Address of the bottom of the text segment. */
54#define N_TXTADDR(ex) \
55	((N_GETMAGIC(ex) == OMAGIC || N_GETMAGIC(ex) == NMAGIC || \
56	N_GETMAGIC(ex) == ZMAGIC) ? 0 : __LDPGSZ)
57
58/* Address of the bottom of the data segment. */
59#define N_DATADDR(ex) \
60	N_ALIGN(ex, N_TXTADDR(ex) + (ex).a_text)
61
62#define N_GETMAGIC(ex) \
63	( (ex).a_midmag & 0xffff )
64#define N_GETMID(ex) \
65	( (N_GETMAGIC_NET(ex) == ZMAGIC) ? N_GETMID_NET(ex) : \
66	((ex).a_midmag >> 16) & 0x03ff )
67#define N_GETFLAG(ex) \
68	( (N_GETMAGIC_NET(ex) == ZMAGIC) ? N_GETFLAG_NET(ex) : \
69	((ex).a_midmag >> 26) & 0x3f )
70#define N_SETMAGIC(ex,mag,mid,flag) \
71	( (ex).a_midmag = (((flag) & 0x3f) <<26) | (((mid) & 0x03ff) << 16) | \
72	((mag) & 0xffff) )
73
74#define N_GETMAGIC_NET(ex) \
75	(ntohl((ex).a_midmag) & 0xffff)
76#define N_GETMID_NET(ex) \
77	((ntohl((ex).a_midmag) >> 16) & 0x03ff)
78#define N_GETFLAG_NET(ex) \
79	((ntohl((ex).a_midmag) >> 26) & 0x3f)
80#define N_SETMAGIC_NET(ex,mag,mid,flag) \
81	( (ex).a_midmag = htonl( (((flag)&0x3f)<<26) | (((mid)&0x03ff)<<16) | \
82	(((mag)&0xffff)) ) )
83
84/* Text segment offset. */
85#define	N_TXTOFF(ex) \
86	(N_GETMAGIC(ex) == ZMAGIC ? __LDPGSZ : (N_GETMAGIC(ex) == QMAGIC || \
87	N_GETMAGIC_NET(ex) == ZMAGIC) ? 0 : sizeof(struct exec))
88
89/* Data segment offset. */
90#define	N_DATOFF(ex) \
91	N_ALIGN(ex, N_TXTOFF(ex) + (ex).a_text)
92
93/* Relocation table offset. */
94#define N_RELOFF(ex) \
95	N_ALIGN(ex, N_DATOFF(ex) + (ex).a_data)
96
97/* Symbol table offset. */
98#define N_SYMOFF(ex) \
99	(N_RELOFF(ex) + (ex).a_trsize + (ex).a_drsize)
100
101/* String table offset. */
102#define	N_STROFF(ex) 	(N_SYMOFF(ex) + (ex).a_syms)
103
104/*
105 * Header prepended to each a.out file.
106 * only manipulate the a_midmag field via the
107 * N_SETMAGIC/N_GET{MAGIC,MID,FLAG} macros in a.out.h
108 */
109
110struct exec {
111unsigned long  a_midmag;   /* htonl(flags<<26 | mid<<16 | magic) */
112unsigned long	a_text;		/* text segment size */
113unsigned long	a_data;		/* initialized data size */
114unsigned long	a_bss;		/* uninitialized data size */
115unsigned long	a_syms;		/* symbol table size */
116unsigned long	a_entry;	/* entry point */
117unsigned long	a_trsize;	/* text relocation size */
118unsigned long	a_drsize;	/* data relocation size */
119};
120#define a_magic a_midmag /* XXX Hack to work with current kern_execve.c */
121
122/* a_magic */
123#define	OMAGIC		0407	/* old impure format */
124#define	NMAGIC		0410	/* read-only text */
125#define	ZMAGIC		0413	/* demand load format */
126#define QMAGIC          0314    /* "compact" demand load format */
127
128#endif /* !_EXEC_H_ */
129