251 lines
6.5 KiB
C
251 lines
6.5 KiB
C
/* $NetBSD: nlist_aout.c,v 1.7 2000/06/14 06:49:25 cgd Exp $ */
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/*-
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* Copyright (c) 1996 Christopher G. Demetriou. All rights reserved.
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "from: @(#)nlist.c 8.1 (Berkeley) 6/6/93";
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#else
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__RCSID("$NetBSD: nlist_aout.c,v 1.7 2000/06/14 06:49:25 cgd Exp $");
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#endif
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#endif /* not lint */
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#include <sys/param.h>
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#include <a.out.h>
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#include <db.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <kvm.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "extern.h"
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#ifdef NLIST_AOUT
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typedef struct nlist NLIST;
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#define _strx n_un.n_strx
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#define _name n_un.n_name
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#define badfmt(str) \
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do { \
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warnx("%s: %s: %s", kfile, str, strerror(EFTYPE)); \
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punt(); \
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} while (0)
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static void badread __P((int, char *));
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static u_long get_kerntext __P((const char *kfn));
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static const char *kfile;
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int
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create_knlist_aout(name, db)
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const char *name;
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DB *db;
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{
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int nsyms;
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struct exec ebuf;
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FILE *fp;
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NLIST nbuf;
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DBT data, key;
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int fd, nr, strsize;
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u_long kerntextoff;
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char *strtab, buf[1024];
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kfile = name;
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if ((fd = open(name, O_RDONLY, 0)) < 0) {
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warn("%s", kfile);
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punt();
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}
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/* Read in exec structure. */
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nr = read(fd, &ebuf, sizeof(struct exec));
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if (nr != sizeof(struct exec))
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return (-1);
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/* Check magic number. */
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if (N_BADMAG(ebuf))
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return (-1);
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/*
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* We've recognized it as an a.out binary. From here
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* on out, all errors are fatal.
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*/
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/* Check symbol count. */
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if (!ebuf.a_syms)
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badfmt("stripped");
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/* Seek to string table. */
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if (lseek(fd, N_STROFF(ebuf), SEEK_SET) == -1)
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badfmt("corrupted string table");
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/* Read in the size of the symbol table. */
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nr = read(fd, (char *)&strsize, sizeof(strsize));
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if (nr != sizeof(strsize))
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badread(nr, "no symbol table");
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/* Read in the string table. */
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strsize -= sizeof(strsize);
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if (!(strtab = malloc(strsize))) {
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warn("malloc");
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punt();
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}
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if ((nr = read(fd, strtab, strsize)) != strsize)
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badread(nr, "corrupted symbol table");
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/* Seek to symbol table. */
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if (!(fp = fdopen(fd, "r"))) {
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warn("%s", name);
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punt();
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}
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if (fseek(fp, N_SYMOFF(ebuf), SEEK_SET) == -1) {
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warn("%s", name);
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punt();
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}
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data.data = (u_char *)&nbuf;
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data.size = sizeof(NLIST);
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kerntextoff = get_kerntext(name);
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/* Read each symbol and enter it into the database. */
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nsyms = ebuf.a_syms / sizeof(struct nlist);
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while (nsyms--) {
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if (fread((char *)&nbuf, sizeof (NLIST), 1, fp) != 1) {
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if (feof(fp))
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badfmt("corrupted symbol table");
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warn("%s", name);
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punt();
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}
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if (!nbuf._strx || nbuf.n_type&N_STAB)
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continue;
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key.data = (u_char *)strtab + nbuf._strx - sizeof(long);
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key.size = strlen((char *)key.data);
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if (db->put(db, &key, &data, 0)) {
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warn("record enter");
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punt();
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}
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if (strcmp((char *)key.data, VRS_SYM) == 0) {
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long cur_off, voff;
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/*
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* Calculate offset relative to a normal (non-kernel)
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* a.out. Kerntextoff is where the kernel is really
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* loaded; N_TXTADDR is where a normal file is loaded.
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* From there, locate file offset in text or data.
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*/
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voff = nbuf.n_value - kerntextoff + N_TXTADDR(ebuf);
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if ((nbuf.n_type & N_TYPE) == N_TEXT)
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voff += N_TXTOFF(ebuf) - N_TXTADDR(ebuf);
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else
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voff += N_DATOFF(ebuf) - N_DATADDR(ebuf);
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cur_off = ftell(fp);
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if (fseek(fp, voff, SEEK_SET) == -1)
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badfmt("corrupted string table");
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/*
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* Read version string up to, and including newline.
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* This code assumes that a newline terminates the
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* version line.
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*/
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if (fgets(buf, sizeof(buf), fp) == NULL)
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badfmt("corrupted string table");
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key.data = (u_char *)VRS_KEY;
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key.size = sizeof(VRS_KEY) - 1;
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data.data = (u_char *)buf;
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data.size = strlen(buf);
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if (db->put(db, &key, &data, 0)) {
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warn("record enter");
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punt();
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}
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/* Restore to original values. */
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data.data = (u_char *)&nbuf;
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data.size = sizeof(NLIST);
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if (fseek(fp, cur_off, SEEK_SET) == -1)
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badfmt("corrupted string table");
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}
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}
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(void)fclose(fp);
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return (0);
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}
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static void
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badread(nr, p)
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int nr;
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char *p;
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{
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if (nr < 0) {
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warn("%s", kfile);
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punt();
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}
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badfmt(p);
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}
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/*
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* Instead of compiling in KERNTEXTOFF or KERNBASE, try to
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* determine the text start address from a standard symbol.
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* For backward compatibility, use the old compiled-in way
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* when the standard symbol name is not found.
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*/
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static u_long
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get_kerntext(name)
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const char *name;
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{
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struct nlist nl[2];
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memset((caddr_t)nl, 0, sizeof(nl));
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nl[0].n_un.n_name = "_kernel_text";
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if (nlist(name, nl) != 0) {
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warnx("%s: %s symbol missing",
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name, nl[0].n_un.n_name);
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punt();
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}
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return (nl[0].n_value);
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}
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#endif /* NLIST_AOUT */
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