From 85e8977a2c1aceaca8f7701f6fd5133edecf5cc4 Mon Sep 17 00:00:00 2001
From: Andrew Turner <andrew@FreeBSD.org>
Date: Sun, 25 Aug 2013 11:23:38 +0000
Subject: [PATCH] Add the frame information to cpu_switch to allow us to unwind
 out of it, for example when dumping threads in the kernel debugger.

---
 sys/arm/arm/swtch.S | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/sys/arm/arm/swtch.S b/sys/arm/arm/swtch.S
index 92c420b2ca28..95a37cfe6cf7 100644
--- a/sys/arm/arm/swtch.S
+++ b/sys/arm/arm/swtch.S
@@ -218,6 +218,11 @@ END(cpu_throw)
 ENTRY(cpu_switch)
 	stmfd	sp!, {r4-r7, lr}
 	sub	sp, sp, #4;
+#ifdef __ARM_EABI__
+	.save	{r4-r7, lr}
+	.pad	#4
+#endif
+
 	mov	r6, r2 /* Save the mutex */
 
 .Lswitch_resume: