The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/nlist_aout.h

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    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. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by the University of
   21  *      California, Berkeley and its contributors.
   22  * 4. Neither the name of the University nor the names of its contributors
   23  *    may be used to endorse or promote products derived from this software
   24  *    without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   36  * SUCH DAMAGE.
   37  *
   38  *      @(#)nlist.h     8.2 (Berkeley) 1/21/94
   39  *
   40  * $FreeBSD: src/sys/sys/nlist_aout.h,v 1.7 1999/08/27 23:44:51 peter Exp $
   41  * $DragonFly: src/sys/sys/nlist_aout.h,v 1.3 2003/08/20 07:31:21 rob Exp $
   42  */
   43 
   44 #ifndef _NLIST_H_
   45 #define _NLIST_H_
   46 
   47 /*
   48  * Symbol table entries in a.out files.
   49  */
   50 
   51 /*
   52  * Layout of each symbol.  The "#ifdef _AOUT_INCLUDE_" is so that
   53  * programs including nlist.h can initialize nlist structures
   54  * statically.
   55  */
   56 struct nlist {
   57 #ifdef _AOUT_INCLUDE_
   58         union {
   59                 char *n_name;   /* symbol name (in memory) */
   60                 long n_strx;    /* file string table offset (on disk) */
   61         } n_un;
   62 #else
   63         char *n_name;           /* symbol name (in memory) */
   64 #endif
   65         unsigned char n_type;   /* type defines */
   66         char n_other;           /* ".type" and binding information */
   67         short n_desc;           /* used by stab entries */
   68         unsigned long n_value;  /* address/value of the symbol */
   69 };
   70 
   71 #define n_hash  n_desc          /* used internally by ld(1); XXX */
   72 
   73 /*
   74  * Defines for n_type.
   75  */
   76 #define N_UNDF  0x00            /* undefined */
   77 #define N_ABS   0x02            /* absolute address */
   78 #define N_TEXT  0x04            /* text segment */
   79 #define N_DATA  0x06            /* data segment */
   80 #define N_BSS   0x08            /* bss segment */
   81 #define N_INDR  0x0a            /* alias definition */
   82 #define N_SIZE  0x0c            /* pseudo type, defines a symbol's size */
   83 #define N_COMM  0x12            /* common reference */
   84 /* GNU extensions */
   85 #define N_SETA  0x14            /* Absolute set element symbol */
   86 #define N_SETT  0x16            /* Text set element symbol */
   87 #define N_SETD  0x18            /* Data set element symbol */
   88 #define N_SETB  0x1a            /* Bss set element symbol */
   89 #define N_SETV  0x1c            /* Pointer to set vector in data area. */
   90 /* end GNU extensions */
   91 #define N_FN    0x1e            /* file name (N_EXT on) */
   92 #define N_WARN  0x1e            /* warning message (N_EXT off) */
   93 
   94 #define N_EXT   0x01            /* external (global) bit, OR'ed in */
   95 #define N_TYPE  0x1e            /* mask for all the type bits */
   96 #define N_STAB  0xe0            /* mask for debugger symbols -- stab(5) */
   97 
   98 /*
   99  * Defines for n_other.  It contains the ".type" (AUX) field in the least
  100  * significant 4 bits, and the binding (for weak symbols) in the most
  101  * significant 4 bits.
  102  */
  103 #define N_AUX(p)        ((p)->n_other & 0xf)
  104 #define N_BIND(p)       (((unsigned int)(p)->n_other >> 4) & 0xf)
  105 #define N_OTHER(r, v)   (((unsigned int)(r) << 4) | ((v) & 0xf))
  106 
  107 #define AUX_OBJECT      1       /* data object */
  108 #define AUX_FUNC        2       /* function */
  109 
  110 /*#define BIND_LOCAL    0       not used */
  111 /*#define BIND_GLOBAL   1       not used */
  112 #define BIND_WEAK       2       /* weak binding */
  113 
  114 #define N_FORMAT        "%08x"  /* namelist value format; XXX */
  115 
  116 #include <sys/cdefs.h>
  117 
  118 __BEGIN_DECLS
  119 int nlist (const char *, struct nlist *);
  120 __END_DECLS
  121 
  122 #endif /* !_NLIST_H_ */

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