include/nlist.h

   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  * 3. 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: src/include/nlist.h,v 1.7 1999/08/27 23:44:51 peter Exp $
  37  * $DragonFly: src/include/nlist.h,v 1.4 2004/11/18 12:38:43 joerg Exp $
  38  */
  39
  40 #ifndef _NLIST_H_
  41 #define _NLIST_H_
  42
  43 /*
  44  * Symbol table entries in a.out files.
  45  */
  46
  47 /*
  48  * Layout of each symbol.  The "#ifdef _AOUT_INCLUDE_" is so that
  49  * programs including nlist.h can initialize nlist structures
  50  * statically.
  51  */
  52 struct nlist {
  53 #ifdef _AOUT_INCLUDE_
  54         union {
  55                 const char *n_name;     /* symbol name (in memory) */
  56                 long n_strx;            /* file string table offset (on disk) */
  57         } n_un;
  58 #else
  59         const char *n_name;     /* symbol name (in memory) */
  60 #endif
  61         unsigned char n_type;   /* type defines */
  62         char n_other;           /* ".type" and binding information */
  63         short n_desc;           /* used by stab entries */
  64         unsigned long n_value;  /* address/value of the symbol */
  65 };
  66
  67 #define n_hash  n_desc          /* used internally by ld(1); XXX */
  68
  69 /*
  70  * Defines for n_type.
  71  */
  72 #define N_UNDF  0x00            /* undefined */
  73 #define N_ABS   0x02            /* absolute address */
  74 #define N_TEXT  0x04            /* text segment */
  75 #define N_DATA  0x06            /* data segment */
  76 #define N_BSS   0x08            /* bss segment */
  77 #define N_INDR  0x0a            /* alias definition */
  78 #define N_SIZE  0x0c            /* pseudo type, defines a symbol's size */
  79 #define N_COMM  0x12            /* common reference */
  80 /* GNU extensions */
  81 #define N_SETA  0x14            /* Absolute set element symbol */
  82 #define N_SETT  0x16            /* Text set element symbol */
  83 #define N_SETD  0x18            /* Data set element symbol */
  84 #define N_SETB  0x1a            /* Bss set element symbol */
  85 #define N_SETV  0x1c            /* Pointer to set vector in data area. */
  86 /* end GNU extensions */
  87 #define N_FN    0x1e            /* file name (N_EXT on) */
  88 #define N_WARN  0x1e            /* warning message (N_EXT off) */
  89
  90 #define N_EXT   0x01            /* external (global) bit, OR'ed in */
  91 #define N_TYPE  0x1e            /* mask for all the type bits */
  92 #define N_STAB  0xe0            /* mask for debugger symbols -- stab(5) */
  93
  94 /*
  95  * Defines for n_other.  It contains the ".type" (AUX) field in the least
  96  * significant 4 bits, and the binding (for weak symbols) in the most
  97  * significant 4 bits.
  98  */
  99 #define N_AUX(p)        ((p)->n_other & 0xf)
 100 #define N_BIND(p)       (((unsigned int)(p)->n_other >> 4) & 0xf)
 101 #define N_OTHER(r, v)   (((unsigned int)(r) << 4) | ((v) & 0xf))
 102
 103 #define AUX_OBJECT      1       /* data object */
 104 #define AUX_FUNC        2       /* function */
 105
 106 /*#define BIND_LOCAL    0       not used */
 107 /*#define BIND_GLOBAL   1       not used */
 108 #define BIND_WEAK       2       /* weak binding */
 109
 110 #define N_FORMAT        "%08x"  /* namelist value format; XXX */
 111
 112 #include <sys/cdefs.h>
 113
 114 __BEGIN_DECLS
 115 int nlist (const char *, struct nlist *);
 116 __END_DECLS
 117
 118 #endif /* !_NLIST_H_ */