xref: /illumos-gate/usr/src/boot/sys/sys/nlist_aout.h (revision 20a7641f9918de8574b8b3b47dbe35c4bfc78df1)
1 /*-
2  * Copyright (c) 1991, 1993
3  *	The Regents of the University of California.  All rights reserved.
4  * (c) UNIX System Laboratories, Inc.
5  * All or some portions of this file are derived from material licensed
6  * to the University of California by American Telephone and Telegraph
7  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8  * the permission of UNIX System Laboratories, Inc.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  * 4. Neither the name of the University nor the names of its contributors
19  *    may be used to endorse or promote products derived from this software
20  *    without specific prior written permission.
21  *
22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32  * SUCH DAMAGE.
33  *
34  *	@(#)nlist.h	8.2 (Berkeley) 1/21/94
35  *
36  * $FreeBSD$
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  */
51 struct 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_ */
112