/* * Copyright (c) 1989 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * Rick Macklem at The University of Guelph. * * 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. */ #ifndef lint char copyright[] = "@(#) Copyright (c) 1989 Regents of the University of California.\n\ All rights reserved.\n"; #endif not lint #ifndef lint static char sccsid[] = "@(#)diskless_offset.c 5.1 (Berkeley) 7/16/89"; #endif /* not lint */ #include <stdio.h> #include <a.out.h> #include <fcntl.h> #include <sys/types.h> #include "param.h" /* * This program looks up the nfs_diskless symbol in a vmunix image and * prints out the byte offset in the file for it. * The trick is that it must be compiled so that it knows how to handle * the target architecture for that vmunix. * (Unfortunately, for the pmax, this also implies knowing about Coff.) * * Define COFF if the vmunix is in Coff format. This will also require * linking to an nlist() that knows Coff. (I just compile it on a RISC/Ultrix * system) nb: Other Coff machines may need different .h files. * * You must compile it with a -I argument that points to the target * architecture's sys/machine/include directory. * Because of the above hassles, it has been kept as a separate program instead * of integrating it into diskless_setup. */ /* * In the bsd a.out.h, there is a different def'n of struct nlist, so we * fiddle about. */ #ifdef COFF #define nl_name n_name #else #define nl_name n_un.n_name #endif #ifndef CLBYTES #define CLBYTES (NBPG * CLSIZE) #endif main(argc, argv) int argc; char *argv[]; { int fd; u_long offset, textsize, dataoff; #ifdef COFF struct filehdr filehdr; struct aouthdr aout; #else struct exec aout; #endif struct nlist nl[2]; if (argc != 2) { fprintf(stderr, "No Exec file!\n"); exit(1); } nl[0].nl_name = "_nfs_diskless"; nl[1].nl_name = ""; if (nlist(argv[1], nl) != 0) { fprintf(stderr, "Can't find nfs_diskless symbol\n"); exit(1); } if ((fd = open(argv[1], O_RDONLY, 0)) < 0) { fprintf(stderr, "Can't open %s\n", argv[1]); exit(1); } #ifdef COFF if (read(fd, &filehdr, sizeof (filehdr)) != sizeof (filehdr)) { fprintf(stderr, "Can't read a.out header\n"); exit(1); } #endif if (read(fd, &aout, sizeof (aout)) != sizeof (aout)) { fprintf(stderr, "Can't read a.out header\n"); exit(1); } close(fd); /* * First, calculate the offset of nfs_diskless within the .data * segment. */ #ifdef COFF dataoff = ((u_long)nl[0].n_value) - aout.data_start; #else /* * Does this work for all bsd ports?? I have only tested vax. */ textsize = ((aout.a_text + CLBYTES - 1) / CLBYTES) * CLBYTES; dataoff = (nl[0].n_value & ~KERNBASE) - textsize; #endif /* * Now, calculate the offset within the object file for that * data offset. */ #ifdef COFF offset = N_TXTOFF(filehdr, aout) + aout.tsize + dataoff; #else offset = N_TXTOFF(aout) + aout.a_text + dataoff; #endif printf("%d\n", offset); }