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nlist.c revision 1.13 
      1 /*-
      2  * Copyright (c) 1996 Christopher G. Demetriou.  All rights reserved.
      3  * Copyright (c) 1990, 1993
      4  *	The Regents of the University of California.  All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. All advertising materials mentioning features or use of this software
     15  *    must display the following acknowledgement:
     16  *	This product includes software developed by the University of
     17  *	California, Berkeley and its contributors.
     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 
     35 #ifndef lint
     36 /*static char sccsid[] = "from: @(#)nlist.c	8.1 (Berkeley) 6/6/93";*/
     37 static char *rcsid = "$Id: nlist.c,v 1.13 1996/09/29 02:19:57 cgd Exp $";
     38 #endif /* not lint */
     39 
     40 #include <sys/param.h>
     41 
     42 #include <a.out.h>
     43 #include <db.h>
     44 #include <err.h>
     45 #include <errno.h>
     46 #include <fcntl.h>
     47 #include <kvm.h>
     48 #include <limits.h>
     49 #include <stdio.h>
     50 #include <stdlib.h>
     51 #include <string.h>
     52 #include <unistd.h>
     53 
     54 #include "extern.h"
     55 
     56 static struct {
     57         int     (*knlist) __P((const char *, DB *));
     58 } knlist_fmts[] = {
     59 #ifdef NLIST_AOUT
     60         {       create_knlist_aout          },
     61 #endif
     62 #ifdef NLIST_ECOFF
     63         {       create_knlist_ecoff         },
     64 #endif
     65 #ifdef NLIST_ELF32
     66         {       create_knlist_elf32         },
     67 #endif
     68 #ifdef NLIST_ELF64
     69         {       create_knlist_elf64         },
     70 #endif
     71 };
     72 
     73 void
     74 create_knlist(name, db)
     75 	const char *name;
     76 	DB *db;
     77 {
     78 	int i;
     79 
     80         for (i = 0; i < sizeof(knlist_fmts) / sizeof(knlist_fmts[0]); i++)
     81                 if ((*knlist_fmts[i].knlist)(name, db) != -1)
     82                         return;
     83 	warnx("%s: file format not recognized", name);
     84 	punt();
     85 }
     86 
     87 /*
     88  * XXX: Using this value from machine/param.h introduces a
     89  * XXX: machine dependency on this program, so /usr can not
     90  * XXX: be shared between (i.e.) several m68k machines.
     91  * Instead of compiling in KERNTEXTOFF or KERNBASE, try to
     92  * determine the text start address from a standard symbol.
     93  * For backward compatibility, use the old compiled-in way
     94  * when the standard symbol name is not found.
     95  */
     96 #ifndef KERNTEXTOFF
     97 #define KERNTEXTOFF KERNBASE
     98 #endif
     99 
    100 u_long
    101 get_kerntext(name)
    102 	const char *name;
    103 {
    104 	struct nlist nl[2];
    105 
    106 	bzero((caddr_t)nl, sizeof(nl));
    107 	nl[0].n_un.n_name = "_kernel_text";
    108 
    109 	if (nlist(name, nl) != 0)
    110 		return (KERNTEXTOFF);
    111 
    112 	return (nl[0].n_value);
    113 }
    114