[src/trunk]: src/sys/modules/panic add panic.kmod, an easy way to trigger a p...

[jmcneill <jmcneill%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/c125c5056bd9
branches:  trunk
changeset: 762244:c125c5056bd9
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Fri Feb 18 01:07:20 2011 +0000

description:
add panic.kmod, an easy way to trigger a panic. takes a 'how' argument
to specify how to trigger the panic:
 modload -s how=panic panic.kmod   <-- just calls panic()
 modload -s how=nullptr panic.kmod <-- null ptr deref
if how isn't specified, it defaults to 'panic'. feel free to add more.

diffstat:

 sys/modules/panic/Makefile |   8 ++++
 sys/modules/panic/panic.c  |  85 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 93 insertions(+), 0 deletions(-)

diffs (101 lines):

diff -r bf7df1a9f21b -r c125c5056bd9 sys/modules/panic/Makefile
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/modules/panic/Makefile        Fri Feb 18 01:07:20 2011 +0000
@@ -0,0 +1,8 @@
+# $NetBSD: Makefile,v 1.1 2011/02/18 01:07:20 jmcneill Exp $
+
+.include "../Makefile.inc"
+
+KMOD=  panic
+SRCS=  panic.c
+
+.include <bsd.kmodule.mk>
diff -r bf7df1a9f21b -r c125c5056bd9 sys/modules/panic/panic.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/modules/panic/panic.c Fri Feb 18 01:07:20 2011 +0000
@@ -0,0 +1,85 @@
+/* $NetBSD: panic.c,v 1.1 2011/02/18 01:07:20 jmcneill Exp $ */
+
+/*
+ * Copyright (c) 2011 Jared D. McNeill <jmcneill%invisible.ca@localhost>
+ * 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. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__KERNEL_RCSID(0, "$NetBSD: panic.c,v 1.1 2011/02/18 01:07:20 jmcneill Exp $");
+
+#include <sys/module.h>
+
+MODULE(MODULE_CLASS_MISC, panic, NULL);
+
+static void
+panic_dopanic(void)
+{
+       /* just call panic */
+       panic("oops");
+}
+
+static void
+panic_donullptr(void)
+{
+       /* null ptr dereference */
+       *(int *)NULL = 1;
+}
+
+static const struct {
+       const char *name;
+       void (*func)(void);
+} panic_howto[] = {
+       { "panic",      panic_dopanic },
+       { "nullptr",    panic_donullptr },
+};
+
+static int
+panic_modcmd(modcmd_t cmd, void *opaque)
+{
+       if (cmd == MODULE_CMD_INIT) {
+               prop_dictionary_t props = opaque;
+               const char *how = NULL;
+               unsigned int i;
+
+               if (props)
+                       prop_dictionary_get_cstring_nocopy(props, "how", &how);
+               if (how == NULL)
+                       how = "panic";
+
+               for (i = 0; i < __arraycount(panic_howto); i++) {
+                       if (strcmp(how, panic_howto[i].name) == 0) {
+                               panic_howto[i].func();
+                               break;
+                       }
+               }
+               if (i == __arraycount(panic_howto))
+                       printf("%s: no how '%s'\n", __func__, how);
+               else
+                       printf("%s: how '%s' didn't panic?\n", __func__, how);
+
+               return EINVAL;
+       }
+
+       return ENOTTY;
+}