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nlist.c revision 1.14 
      1 /*	$NetBSD: nlist.c,v 1.14 1996/09/30 18:27:02 thorpej Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1996 Christopher G. Demetriou.  All rights reserved.
      5  * Copyright (c) 1990, 1993
      6  *	The Regents of the University of California.  All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by the University of
     19  *	California, Berkeley and its contributors.
     20  * 4. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  */
     36 
     37 #ifndef lint
     38 #if 0
     39 static char sccsid[] = "from: @(#)nlist.c	8.1 (Berkeley) 6/6/93";
     40 #else
     41 static char *rcsid = "$NetBSD: nlist.c,v 1.14 1996/09/30 18:27:02 thorpej Exp $";
     42 #endif
     43 #endif /* not lint */
     44 
     45 #include <sys/param.h>
     46 
     47 #include <a.out.h>
     48 #include <db.h>
     49 #include <err.h>
     50 #include <errno.h>
     51 #include <fcntl.h>
     52 #include <kvm.h>
     53 #include <limits.h>
     54 #include <stdio.h>
     55 #include <stdlib.h>
     56 #include <string.h>
     57 #include <unistd.h>
     58 
     59 #include "extern.h"
     60 
     61 static struct {
     62         int     (*knlist) __P((const char *, DB *));
     63 } knlist_fmts[] = {
     64 #ifdef NLIST_AOUT
     65         {       create_knlist_aout          },
     66 #endif
     67 #ifdef NLIST_ECOFF
     68         {       create_knlist_ecoff         },
     69 #endif
     70 #ifdef NLIST_ELF32
     71         {       create_knlist_elf32         },
     72 #endif
     73 #ifdef NLIST_ELF64
     74         {       create_knlist_elf64         },
     75 #endif
     76 };
     77 
     78 void
     79 create_knlist(name, db)
     80 	const char *name;
     81 	DB *db;
     82 {
     83 	int i;
     84 
     85         for (i = 0; i < sizeof(knlist_fmts) / sizeof(knlist_fmts[0]); i++)
     86                 if ((*knlist_fmts[i].knlist)(name, db) != -1)
     87                         return;
     88 	warnx("%s: file format not recognized", name);
     89 	punt();
     90 }
     91 
     92 /*
     93  * XXX: Using this value from machine/param.h introduces a
     94  * XXX: machine dependency on this program, so /usr can not
     95  * XXX: be shared between (i.e.) several m68k machines.
     96  * Instead of compiling in KERNTEXTOFF or KERNBASE, try to
     97  * determine the text start address from a standard symbol.
     98  * For backward compatibility, use the old compiled-in way
     99  * when the standard symbol name is not found.
    100  */
    101 #ifndef KERNTEXTOFF
    102 #define KERNTEXTOFF KERNBASE
    103 #endif
    104 
    105 u_long
    106 get_kerntext(name)
    107 	const char *name;
    108 {
    109 	struct nlist nl[2];
    110 
    111 	bzero((caddr_t)nl, sizeof(nl));
    112 	nl[0].n_un.n_name = "_kernel_text";
    113 
    114 	if (nlist(name, nl) != 0)
    115 		return (KERNTEXTOFF);
    116 
    117 	return (nl[0].n_value);
    118 }
    119