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  * 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: src/sys/sys/nlist_aout.h,v 1.11 2004/04/07 04:19:49 imp Exp $
   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                 char *n_name;   /* symbol name (in memory) */
   55                 long n_strx;    /* file string table offset (on disk) */
   56         } n_un;
   57 #else
   58         char *n_name;           /* symbol name (in memory) */
   59         int : 8 * (sizeof(long) > sizeof(char *) ?
   60             sizeof(long) - sizeof(char *) : sizeof(char *) - sizeof(long));
   61 #endif
   62         unsigned char n_type;   /* type defines */
   63         char n_other;           /* ".type" and binding information */
   64         short n_desc;           /* used by stab entries */
   65         unsigned long n_value;  /* address/value of the symbol */
   66 };
   67 
   68 #define n_hash  n_desc          /* used internally by ld(1); XXX */
   69 
   70 /*
   71  * Defines for n_type.
   72  */
   73 #define N_UNDF  0x00            /* undefined */
   74 #define N_ABS   0x02            /* absolute address */
   75 #define N_TEXT  0x04            /* text segment */
   76 #define N_DATA  0x06            /* data segment */
   77 #define N_BSS   0x08            /* bss segment */
   78 #define N_INDR  0x0a            /* alias definition */
   79 #define N_SIZE  0x0c            /* pseudo type, defines a symbol's size */
   80 #define N_COMM  0x12            /* common reference */
   81 /* GNU extensions */
   82 #define N_SETA  0x14            /* Absolute set element symbol */
   83 #define N_SETT  0x16            /* Text set element symbol */
   84 #define N_SETD  0x18            /* Data set element symbol */
   85 #define N_SETB  0x1a            /* Bss set element symbol */
   86 #define N_SETV  0x1c            /* Pointer to set vector in data area. */
   87 /* end GNU extensions */
   88 #define N_FN    0x1e            /* file name (N_EXT on) */
   89 #define N_WARN  0x1e            /* warning message (N_EXT off) */
   90 
   91 #define N_EXT   0x01            /* external (global) bit, OR'ed in */
   92 #define N_TYPE  0x1e            /* mask for all the type bits */
   93 #define N_STAB  0xe0            /* mask for debugger symbols -- stab(5) */
   94 
   95 /*
   96  * Defines for n_other.  It contains the ".type" (AUX) field in the least
   97  * significant 4 bits, and the binding (for weak symbols) in the most
   98  * significant 4 bits.
   99  */
  100 #define N_AUX(p)        ((p)->n_other & 0xf)
  101 #define N_BIND(p)       (((unsigned int)(p)->n_other >> 4) & 0xf)
  102 #define N_OTHER(r, v)   (((unsigned int)(r) << 4) | ((v) & 0xf))
  103 
  104 #define AUX_OBJECT      1       /* data object */
  105 #define AUX_FUNC        2       /* function */
  106 
  107 /*#define BIND_LOCAL    0       not used */
  108 /*#define BIND_GLOBAL   1       not used */
  109 #define BIND_WEAK       2       /* weak binding */
  110 
  111 #define N_FORMAT        "%08x"  /* namelist value format; XXX */
  112 
  113 #endif /* !_SYS_NLIST_AOUT_H_ */

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