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1/* $OpenBSD: a.out.h,v 1.4 2024/10/16 18:47:48 miod Exp $ */
2/* $NetBSD: a.out.h,v 1.15 1994/10/26 00:55:42 cgd Exp $ */
3
4/*-
5 * Copyright (c) 1993 Theo de Raadt
6 * Copyright (c) 1991 The Regents of the University of California.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. 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 * @(#)a.out.h 5.6 (Berkeley) 4/30/91
34 */
35
36#ifndef _AOUT_H_
37#define _AOUT_H_
38
39/*
40 * Legacy a.out structures and defines.
41 */
42
43/*
44 * Header prepended to each a.out file.
45 * only manipulate the a_midmag field via the
46 * N_SETMAGIC/N_GET{MAGIC,MID,FLAG} macros below.
47 */
48struct exec {
49 u_int32_t a_midmag; /* htonl(flags<<26|mid<<16|magic) */
50 u_int32_t a_text; /* text segment size */
51 u_int32_t a_data; /* initialized data size */
52 u_int32_t a_bss; /* uninitialized data size */
53 u_int32_t a_syms; /* symbol table size */
54 u_int32_t a_entry; /* entry point */
55 u_int32_t a_trsize; /* text relocation size */
56 u_int32_t a_drsize; /* data relocation size */
57};
58
59/* a_magic */
60#define OMAGIC 0407 /* old impure format */
61#define NMAGIC 0410 /* read-only text */
62#define ZMAGIC 0413 /* demand load format */
63#define QMAGIC 0314 /* "compact" demand load format; deprecated */
64
65/*
66 * a_flags
67 */
68#define EX_DYNAMIC 0x20
69#define EX_PIC 0x10
70#define EX_DPMASK 0x30
71/*
72 * Interpretation of the (a_flags & EX_DPMASK) bits:
73 *
74 * 00 traditional executable or object file
75 * 01 object file contains PIC code (set by `as -k')
76 * 10 dynamic executable
77 * 11 position independent executable image
78 * (eg. a shared library)
79 *
80 */
81
82/*
83 * The a.out structure's a_midmag field is a network-byteorder encoding
84 * of this int
85 * FFFFFFmmmmmmmmmmMMMMMMMMMMMMMMMM
86 * Where `F' is 6 bits of flag like EX_DYNAMIC,
87 * `m' is 10 bits of machine-id like MID_I386, and
88 * `M' is 16 bits worth of magic number, ie. ZMAGIC.
89 * The macros below will set/get the needed fields.
90 */
91#define N_GETMAGIC(ex) \
92 ( (((ex).a_midmag)&0xffff0000) ? (ntohl(((ex).a_midmag))&0xffff) : ((ex).a_midmag))
93#define N_GETMAGIC2(ex) \
94 ( (((ex).a_midmag)&0xffff0000) ? (ntohl(((ex).a_midmag))&0xffff) : \
95 (((ex).a_midmag) | 0x10000) )
96#define N_GETMID(ex) \
97 ( (((ex).a_midmag)&0xffff0000) ? ((ntohl(((ex).a_midmag))>>16)&0x03ff) : MID_ZERO )
98#define N_GETFLAG(ex) \
99 ( (((ex).a_midmag)&0xffff0000) ? ((ntohl(((ex).a_midmag))>>26)&0x3f) : 0 )
100#define N_SETMAGIC(ex,mag,mid,flag) \
101 ( (ex).a_midmag = htonl( (((flag)&0x3f)<<26) | (((mid)&0x03ff)<<16) | \
102 (((mag)&0xffff)) ) )
103
104#define N_ALIGN(ex,x) \
105 (N_GETMAGIC(ex) == ZMAGIC || N_GETMAGIC(ex) == QMAGIC ? \
106 ((x) + __LDPGSZ - 1) & ~(__LDPGSZ - 1) : (x))
107
108/* Valid magic number check. */
109#define N_BADMAG(ex) \
110 (N_GETMAGIC(ex) != NMAGIC && N_GETMAGIC(ex) != OMAGIC && \
111 N_GETMAGIC(ex) != ZMAGIC && N_GETMAGIC(ex) != QMAGIC)
112
113/* Address of the bottom of the text segment. */
114#define N_TXTADDR(ex) (N_GETMAGIC2(ex) == (ZMAGIC|0x10000) ? 0 : __LDPGSZ)
115
116/* Address of the bottom of the data segment. */
117#define N_DATADDR(ex) \
118 (N_GETMAGIC(ex) == OMAGIC ? N_TXTADDR(ex) + (ex).a_text : \
119 (N_TXTADDR(ex) + (ex).a_text + __LDPGSZ - 1) & ~(__LDPGSZ - 1))
120
121/* Address of the bottom of the bss segment. */
122#define N_BSSADDR(ex) \
123 (N_DATADDR(ex) + (ex).a_data)
124
125/* Text segment offset. */
126#define N_TXTOFF(ex) \
127 ( N_GETMAGIC2(ex)==ZMAGIC || N_GETMAGIC2(ex)==(QMAGIC|0x10000) ? \
128 0 : (N_GETMAGIC2(ex)==(ZMAGIC|0x10000) ? __LDPGSZ : \
129 sizeof(struct exec)) )
130
131/* Data segment offset. */
132#define N_DATOFF(ex) \
133 N_ALIGN(ex, N_TXTOFF(ex) + (ex).a_text)
134
135/* Text relocation table offset. */
136#define N_TRELOFF(ex) \
137 (N_DATOFF(ex) + (ex).a_data)
138
139/* Data relocation table offset. */
140#define N_DRELOFF(ex) \
141 (N_TRELOFF(ex) + (ex).a_trsize)
142
143/* Symbol table offset. */
144#define N_SYMOFF(ex) \
145 (N_DRELOFF(ex) + (ex).a_drsize)
146
147/* String table offset. */
148#define N_STROFF(ex) \
149 (N_SYMOFF(ex) + (ex).a_syms)
150
151#include <sys/exec.h>
152
153#define _AOUT_INCLUDE_
154#include <nlist.h>
155
156#endif /* !_AOUT_H_ */