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 *	@(#)nlist.h	8.2 (Berkeley) 1/21/94
 37 */
 38
 39#ifndef _SYS_NLIST_AOUT_H_
 40#define	_SYS_NLIST_AOUT_H_
 41
 42/*
 43 * Symbol table entries in a.out files.
 44 */
 45
 46/*
 47 * Layout of each symbol.  The "#ifdef _AOUT_INCLUDE_" is so that
 48 * programs including nlist.h can initialize nlist structures
 49 * statically.
 50 */
 51struct nlist {
 52#ifdef _AOUT_INCLUDE_
 53	union {
 54		const char *n_name; /* symbol name (in memory) */
 55		long n_strx;	/* file string table offset (on disk) */
 56	} n_un;
 57#else
 58	const char *n_name;	/* symbol name (in memory) */
 59#endif
 60	unsigned char n_type;	/* type defines */
 61	char n_other;		/* ".type" and binding information */
 62	short n_desc;		/* used by stab entries */
 63	unsigned long n_value;	/* address/value of the symbol */
 64};
 65
 66#define	n_hash	n_desc		/* used internally by ld(1); XXX */
 67
 68/*
 69 * Defines for n_type.
 70 */
 71#define	N_UNDF	0x00		/* undefined */
 72#define	N_ABS	0x02		/* absolute address */
 73#define	N_TEXT	0x04		/* text segment */
 74#define	N_DATA	0x06		/* data segment */
 75#define	N_BSS	0x08		/* bss segment */
 76#define	N_INDR	0x0a		/* alias definition */
 77#define	N_SIZE	0x0c		/* pseudo type, defines a symbol's size */
 78#define	N_COMM	0x12		/* common reference */
 79/* GNU extensions */
 80#define N_SETA	0x14		/* Absolute set element symbol */
 81#define N_SETT  0x16		/* Text set element symbol */
 82#define N_SETD  0x18		/* Data set element symbol */
 83#define N_SETB  0x1a		/* Bss set element symbol */
 84#define N_SETV  0x1c		/* Pointer to set vector in data area. */
 85/* end GNU extensions */
 86#define	N_FN	0x1e		/* file name (N_EXT on) */
 87#define	N_WARN	0x1e		/* warning message (N_EXT off) */
 88
 89#define	N_EXT	0x01		/* external (global) bit, OR'ed in */
 90#define	N_TYPE	0x1e		/* mask for all the type bits */
 91#define	N_STAB	0xe0		/* mask for debugger symbols -- stab(5) */
 92
 93/*
 94 * Defines for n_other.  It contains the ".type" (AUX) field in the least
 95 * significant 4 bits, and the binding (for weak symbols) in the most
 96 * significant 4 bits.
 97 */
 98#define N_AUX(p)	((p)->n_other & 0xf)
 99#define N_BIND(p)	(((unsigned int)(p)->n_other >> 4) & 0xf)
100#define N_OTHER(r, v)	(((unsigned int)(r) << 4) | ((v) & 0xf))
101
102#define AUX_OBJECT	1	/* data object */
103#define AUX_FUNC	2	/* function */
104
105/*#define BIND_LOCAL	0	not used */
106/*#define BIND_GLOBAL	1	not used */
107#define BIND_WEAK	2	/* weak binding */
108
109#define	N_FORMAT	"%08x"	/* namelist value format; XXX */
110
111#endif /* !_SYS_NLIST_AOUT_H_ */