[src/trunk]: src/sys/arch/aarch64/aarch64 add simple stack overflow checker f...

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

details:   https://anonhg.NetBSD.org/src/rev/178c8dd4780b
branches:  trunk
changeset: 446488:178c8dd4780b
user:      ryo <ryo%NetBSD.org@localhost>
date:      Fri Dec 07 18:46:27 2018 +0000

description:
add simple stack overflow checker for debugging

diffstat:

 sys/arch/aarch64/aarch64/trap.c |  13 +++++++++++--
 1 files changed, 11 insertions(+), 2 deletions(-)

diffs (34 lines):

diff -r 4bc7d56b2fb3 -r 178c8dd4780b sys/arch/aarch64/aarch64/trap.c
--- a/sys/arch/aarch64/aarch64/trap.c   Fri Dec 07 18:45:13 2018 +0000
+++ b/sys/arch/aarch64/aarch64/trap.c   Fri Dec 07 18:46:27 2018 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: trap.c,v 1.11 2018/10/12 01:28:57 ryo Exp $ */
+/* $NetBSD: trap.c,v 1.12 2018/12/07 18:46:27 ryo Exp $ */
 
 /*-
  * Copyright (c) 2014 The NetBSD Foundation, Inc.
@@ -31,7 +31,7 @@
 
 #include <sys/cdefs.h>
 
-__KERNEL_RCSID(1, "$NetBSD: trap.c,v 1.11 2018/10/12 01:28:57 ryo Exp $");
+__KERNEL_RCSID(1, "$NetBSD: trap.c,v 1.12 2018/12/07 18:46:27 ryo Exp $");
 
 #include "opt_arm_intr_impl.h"
 #include "opt_compat_netbsd32.h"
@@ -296,6 +296,15 @@
 {
        struct cpu_info * const ci = curcpu();
 
+#ifdef STACKCHECKS
+       struct lwp *l = curlwp;
+       void *sp = (void *)reg_sp_read();
+       if (l->l_addr >= sp) {
+               panic("lwp/interrupt stack overflow detected."
+                   " lwp=%p, sp=%p, l_addr=%p", l, sp, l->l_addr);
+       }
+#endif
+
        /* enable traps */
        daif_enable(DAIF_D|DAIF_A);