/* $OpenBSD: exec_aout.c,v 1.7 2003/06/28 04:55:07 deraadt Exp $ */ /* * Copyright (c) 1999 Mats O Jansson. All rights reserved. * * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 static char rcsid[] = "$OpenBSD: exec_aout.c,v 1.7 2003/06/28 04:55:07 deraadt Exp $"; #endif #include <err.h> #include <errno.h> #include <fcntl.h> #include <nlist.h> #include <stdlib.h> #include <stdio.h> #include <unistd.h> #include <sys/exec.h> #include <sys/types.h> #include "ukc.h" caddr_t aout_p, aout_r; unsigned long aout_psz = 0, aout_rsz = 0; struct exec aout_ex; unsigned long aout_adjvalue = 0; unsigned long aout_datashift = 0; void aout_computeadj(void) { aout_adjvalue = (unsigned long)aout_p + N_TXTOFF(aout_ex) - nl[P_KERNEL_TEXT].n_value; /* * On m68k a.out ZMAGIC kernel, kernel_text begins _after_ the a.out * header, so compensate for it. */ if (nl[P_KERNEL_TEXT].n_value & (__LDPGSZ - 1)) aout_adjvalue += sizeof(aout_ex); /* * On NMAGIC kernel, we need an extra relocation for the data area */ aout_datashift = (N_DATADDR(aout_ex) - N_TXTADDR(aout_ex)) - aout_ex.a_text; } /* ``kernel'' vaddr -> in-memory address */ caddr_t aout_adjust(caddr_t x) { if (aout_adjvalue == 0) aout_computeadj(); if (aout_datashift != 0 && (unsigned long)x >= N_DATADDR(aout_ex)) x -= aout_datashift; return (x + aout_adjvalue); } /* in-memory address -> ``kernel'' vaddr */ caddr_t aout_readjust(x) caddr_t x; { caddr_t y; #if 0 /* unnecessary, aout_adjust() is always invoked first */ if (aout_adjvalue == 0) aout_computeadj(); #endif y = x - aout_adjvalue; if (aout_datashift != 0 && (unsigned long)y >= N_TXTADDR(aout_ex) + aout_ex.a_text) y += aout_datashift; return (y); } int aout_check(file) char *file; { int fd, ret = 1; if ((fd = open(file, O_RDONLY | O_EXLOCK, 0)) < 0) return (0); if (read(fd, (char *)&aout_ex, sizeof(aout_ex)) != sizeof(aout_ex)) ret = 0; if (ret) { if (N_BADMAG(aout_ex)) ret = 0; } close(fd); return (ret); } void aout_loadkernel(char *file) { int fd; off_t cur, end; if ((fd = open(file, O_RDONLY | O_EXLOCK, 0)) < 0) err(1, "%s", file); if (read(fd, (char *)&aout_ex, sizeof(aout_ex)) != sizeof(aout_ex)) errx(1, "can't read a.out header"); if (N_BADMAG(aout_ex)) errx(1, "bad a.out magic"); lseek(fd, (off_t)0, SEEK_SET); aout_psz = (int)(aout_ex.a_text + N_TXTOFF(aout_ex) + aout_ex.a_data); aout_p = malloc(aout_psz); if (read(fd, aout_p, aout_psz) != aout_psz) errx(1, "can't read a.out text and data"); cur = lseek(fd, (off_t)0, SEEK_CUR); end = lseek(fd, (off_t)0, SEEK_END); (void)lseek(fd, cur, SEEK_SET); aout_rsz = (int)(end - cur); aout_r = malloc(aout_rsz); if (read(fd, aout_r, aout_rsz) != aout_rsz) errx(1, "can't read rest of file %s", file); close(fd); } void aout_savekernel(char *outfile) { int fd; if ((fd = open(outfile, O_WRONLY | O_CREAT | O_TRUNC, 0755)) < 0) err(1, "%s", outfile); if (write(fd, aout_p, aout_psz) != aout_psz) errx(1, "can't write a.out text and data"); if (write(fd, aout_r, aout_rsz) != aout_rsz) errx(1, "can't write rest of file %s", outfile); close(fd); }