From 729ac0ee8cd058899e8a95278d494e05d42de601 Mon Sep 17 00:00:00 2001
From: Andrew Turner <andrew@FreeBSD.org>
Date: Wed, 3 Feb 2016 17:00:19 +0000
Subject: [PATCH] Handle a misaligned stack pointer exception from userspace.
 The exception still needs to be enabled, but this will help with testing.

Sponsored by:	ABT Systems Ltd
---
 sys/arm64/arm64/trap.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sys/arm64/arm64/trap.c b/sys/arm64/arm64/trap.c
index 89d6d0c89f84..10e3f416c2a1 100644
--- a/sys/arm64/arm64/trap.c
+++ b/sys/arm64/arm64/trap.c
@@ -374,6 +374,10 @@ do_el0_sync(struct trapframe *frame)
 	case EXCP_UNKNOWN:
 		el0_excp_unknown(frame);
 		break;
+	case EXCP_SP_ALIGN:
+		call_trapsignal(td, SIGBUS, BUS_ADRALN, (void *)frame->tf_sp);
+		userret(td, frame);
+		break;
 	case EXCP_PC_ALIGN:
 		call_trapsignal(td, SIGBUS, BUS_ADRALN, (void *)frame->tf_elr);
 		userret(td, frame);