initial import of NetBSD tree

1 files changed, 165 insertions, 0 deletions

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 <string.h>
+#include <sys/param.h>
+#include <sys/reboot.h>
+#ifndef INSECURE
+#include <sys/stat.h>
+#endif
+#include <a.out.h>
+
+#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;
+}