From d6583bb2a13f329cf0332ef2570eb8bb8fc0e39c Mon Sep 17 00:00:00 2001 From: Theo de Raadt Date: Wed, 18 Oct 1995 08:53:40 +0000 Subject: initial import of NetBSD tree --- sys/lib/libsa/exec.c | 165 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 165 insertions(+) create mode 100644 sys/lib/libsa/exec.c (limited to 'sys/lib/libsa/exec.c') diff --git a/sys/lib/libsa/exec.c b/sys/lib/libsa/exec.c new file mode 100644 index 00000000000..f4588485f66 --- /dev/null +++ b/sys/lib/libsa/exec.c @@ -0,0 +1,165 @@ +/* $NetBSD: exec.c,v 1.10 1995/08/04 07:37:03 thorpej Exp $ */ + +/*- + * Copyright (c) 1982, 1986, 1990, 1993 + * The Regents of the University of California. 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. + * 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. + */ + +#include +#include +#include +#ifndef INSECURE +#include +#endif +#include + +#include "stand.h" + +static char *ssym, *esym; + +extern u_int opendev; + +void +exec(path, loadaddr, howto) + char *path; + char *loadaddr; + int howto; +{ + register int io; +#ifndef INSECURE + struct stat sb; +#endif + struct exec x; + int i; + register char *addr; + + io = open(path, 0); + if (io < 0) + return; + +#ifndef INSECURE + (void) fstat(io, &sb); + if (sb.st_uid || (sb.st_mode & 2)) { + printf("non-secure file, will not load\n"); + close(io); + errno = EPERM; + return; + } +#endif + + i = read(io, (char *)&x, sizeof(x)); + if (i != sizeof(x) || + N_BADMAG(x)) { + errno = EFTYPE; + return; + } + + /* Text */ + printf("%d", x.a_text); + addr = loadaddr; +#ifdef NO_LSEEK + if (N_GETMAGIC(x) == ZMAGIC && read(io, (char *)addr, 0x400) == -1) +#else + if (N_GETMAGIC(x) == ZMAGIC && lseek(io, 0x400, SEEK_SET) == -1) +#endif + goto shread; + if (read(io, (char *)addr, x.a_text) != x.a_text) + goto shread; + addr += x.a_text; + if (N_GETMAGIC(x) == ZMAGIC || N_GETMAGIC(x) == NMAGIC) + while ((int)addr & (N_PAGSIZ(x) - 1)) + *addr++ = 0; + + /* Data */ + printf("+%d", x.a_data); + if (read(io, addr, x.a_data) != x.a_data) + goto shread; + addr += x.a_data; + + /* Bss */ + printf("+%d", x.a_bss); + for (i = 0; i < x.a_bss; i++) + *addr++ = 0; + + /* Symbols */ + ssym = addr; + bcopy(&x.a_syms, addr, sizeof(x.a_syms)); + addr += sizeof(x.a_syms); + printf("+[%d", x.a_syms); + if (read(io, addr, x.a_syms) != x.a_syms) + goto shread; + addr += x.a_syms; + + if (read(io, &i, sizeof(int)) != sizeof(int)) + goto shread; + + bcopy(&i, addr, sizeof(int)); + if (i) { + i -= sizeof(int); + addr += sizeof(int); + if (read(io, addr, i) != i) + goto shread; + addr += i; + } + + /* and that many bytes of (debug symbols?) */ + printf("+%d]", i); + + close(io); + +#define round_to_size(x) \ + (((int)(x) + sizeof(int) - 1) & ~(sizeof(int) - 1)) + esym = (char *)round_to_size(addr - loadaddr); +#undef round_to_size + + /* and note the end address of all this */ + printf(" total=0x%lx", (u_long)addr); + + x.a_entry += (long)loadaddr; + printf(" start=0x%lx\n", x.a_entry); + +#ifdef EXEC_DEBUG + printf("ssym=0x%x esym=0x%x\n", ssym, esym); + printf("\n\nReturn to boot...\n"); + getchar(); +#endif + + machdep_start((char *)x.a_entry, howto, loadaddr, ssym, esym); + + /* exec failed */ + errno = ENOEXEC; + return; + +shread: + close(io); + errno = EIO; + return; +} -- cgit v1.2.3