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

     /*-
      * Copyright (c) 1991, 1993
      *      The Regents of the University of California.  All rights reserved.
      * (c) UNIX System Laboratories, Inc.
      * All or some portions of this file are derived from material licensed
      * to the University of California by American Telephone and Telegraph
      * Co. or Unix System Laboratories, Inc. and are reproduced herein with
      * the permission of UNIX System Laboratories, Inc.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)nlist.h     8.2 (Berkeley) 1/21/94
     *
     * $FreeBSD: src/sys/sys/nlist_aout.h,v 1.7 1999/08/27 23:44:51 peter Exp $
     * $DragonFly: src/sys/sys/nlist_aout.h,v 1.3 2003/08/20 07:31:21 rob Exp $
     */
    
    #ifndef _NLIST_H_
    #define _NLIST_H_
    
    /*
     * Symbol table entries in a.out files.
     */
    
    /*
     * Layout of each symbol.  The "#ifdef _AOUT_INCLUDE_" is so that
     * programs including nlist.h can initialize nlist structures
     * statically.
     */
    struct nlist {
    #ifdef _AOUT_INCLUDE_
            union {
                    char *n_name;   /* symbol name (in memory) */
                    long n_strx;    /* file string table offset (on disk) */
            } n_un;
    #else
            char *n_name;           /* symbol name (in memory) */
    #endif
            unsigned char n_type;   /* type defines */
            char n_other;           /* ".type" and binding information */
            short n_desc;           /* used by stab entries */
            unsigned long n_value;  /* address/value of the symbol */
    };
    
    #define n_hash  n_desc          /* used internally by ld(1); XXX */
    
    /*
     * Defines for n_type.
     */
    #define N_UNDF  0x00            /* undefined */
    #define N_ABS   0x02            /* absolute address */
    #define N_TEXT  0x04            /* text segment */
    #define N_DATA  0x06            /* data segment */
    #define N_BSS   0x08            /* bss segment */
    #define N_INDR  0x0a            /* alias definition */
    #define N_SIZE  0x0c            /* pseudo type, defines a symbol's size */
    #define N_COMM  0x12            /* common reference */
    /* GNU extensions */
    #define N_SETA  0x14            /* Absolute set element symbol */
    #define N_SETT  0x16            /* Text set element symbol */
    #define N_SETD  0x18            /* Data set element symbol */
    #define N_SETB  0x1a            /* Bss set element symbol */
    #define N_SETV  0x1c            /* Pointer to set vector in data area. */
    /* end GNU extensions */
    #define N_FN    0x1e            /* file name (N_EXT on) */
    #define N_WARN  0x1e            /* warning message (N_EXT off) */
    
    #define N_EXT   0x01            /* external (global) bit, OR'ed in */
    #define N_TYPE  0x1e            /* mask for all the type bits */
    #define N_STAB  0xe0            /* mask for debugger symbols -- stab(5) */
    
    /*
     * Defines for n_other.  It contains the ".type" (AUX) field in the least
    * significant 4 bits, and the binding (for weak symbols) in the most
    * significant 4 bits.
    */
   #define N_AUX(p)        ((p)->n_other & 0xf)
   #define N_BIND(p)       (((unsigned int)(p)->n_other >> 4) & 0xf)
   #define N_OTHER(r, v)   (((unsigned int)(r) << 4) | ((v) & 0xf))
   
   #define AUX_OBJECT      1       /* data object */
   #define AUX_FUNC        2       /* function */
   
   /*#define BIND_LOCAL    0       not used */
   /*#define BIND_GLOBAL   1       not used */
   #define BIND_WEAK       2       /* weak binding */
   
   #define N_FORMAT        "%08x"  /* namelist value format; XXX */
   
   #include <sys/cdefs.h>
   
   __BEGIN_DECLS
   int nlist (const char *, struct nlist *);
   __END_DECLS
   
   #endif /* !_NLIST_H_ */

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