1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
8 * to the University of California by American Telephone and Telegraph
9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#ifndef _SYS_NLIST_AOUT_H_
38#define _SYS_NLIST_AOUT_H_
39
40/*
41 * Symbol table entries in a.out files.
42 */
43
44/*
45 * Layout of each symbol. The "#ifdef _AOUT_INCLUDE_" is so that
46 * programs including nlist.h can initialize nlist structures
47 * statically.
48 */
49struct nlist {
50#ifdef _AOUT_INCLUDE_
51 union {
52 const char *n_name; /* symbol name (in memory) */
53 long n_strx; /* file string table offset (on disk) */
54 } n_un;
55#else
56 const char *n_name; /* symbol name (in memory) */
57#endif
58 unsigned char n_type; /* type defines */
59 char n_other; /* ".type" and binding information */
60 short n_desc; /* used by stab entries */
61 unsigned long n_value; /* address/value of the symbol */
62};
63
64#define n_hash n_desc /* used internally by ld(1); XXX */
65
66/*
67 * Defines for n_type.
68 */
69#define N_UNDF 0x00 /* undefined */
70#define N_ABS 0x02 /* absolute address */
71#define N_TEXT 0x04 /* text segment */
72#define N_DATA 0x06 /* data segment */
73#define N_BSS 0x08 /* bss segment */
74#define N_INDR 0x0a /* alias definition */
75#define N_SIZE 0x0c /* pseudo type, defines a symbol's size */
76#define N_COMM 0x12 /* common reference */
77/* GNU extensions */
78#define N_SETA 0x14 /* Absolute set element symbol */
79#define N_SETT 0x16 /* Text set element symbol */
80#define N_SETD 0x18 /* Data set element symbol */
81#define N_SETB 0x1a /* Bss set element symbol */
82#define N_SETV 0x1c /* Pointer to set vector in data area. */
83/* end GNU extensions */
84#define N_FN 0x1e /* file name (N_EXT on) */
85#define N_WARN 0x1e /* warning message (N_EXT off) */
86
87#define N_EXT 0x01 /* external (global) bit, OR'ed in */
88#define N_TYPE 0x1e /* mask for all the type bits */
89#define N_STAB 0xe0 /* mask for debugger symbols -- stab(5) */
90
91/*
92 * Defines for n_other. It contains the ".type" (AUX) field in the least
93 * significant 4 bits, and the binding (for weak symbols) in the most
94 * significant 4 bits.
95 */
96#define N_AUX(p) ((p)->n_other & 0xf)
97#define N_BIND(p) (((unsigned int)(p)->n_other >> 4) & 0xf)
98#define N_OTHER(r, v) (((unsigned int)(r) << 4) | ((v) & 0xf))
99
100#define AUX_OBJECT 1 /* data object */
101#define AUX_FUNC 2 /* function */
102
103/*#define BIND_LOCAL 0 not used */
104/*#define BIND_GLOBAL 1 not used */
105#define BIND_WEAK 2 /* weak binding */
106
107#define N_FORMAT "%08x" /* namelist value format; XXX */
108
109#endif /* !_SYS_NLIST_AOUT_H_ */