From 8a39ee361feb9bf46d728ff1ba4f07ca1d9610b1 Mon Sep 17 00:00:00 2001
From: Michael Stapelberg <stapelberg@debian.org>
Date: Thu, 19 Jun 2014 09:22:53 +0200
Subject: Imported Upstream version 1.3

---
 src/pkg/runtime/atomic_arm.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'src/pkg/runtime/atomic_arm.c')

diff --git a/src/pkg/runtime/atomic_arm.c b/src/pkg/runtime/atomic_arm.c
index b1e97b27d..d914475c7 100644
--- a/src/pkg/runtime/atomic_arm.c
+++ b/src/pkg/runtime/atomic_arm.c
@@ -41,6 +41,19 @@ runtime·xchg(uint32 volatile* addr, uint32 v)
 	}
 }
 
+#pragma textflag NOSPLIT
+void*
+runtime·xchgp(void* volatile* addr, void* v)
+{
+	void *old;
+
+	for(;;) {
+		old = *addr;
+		if(runtime·casp(addr, old, v))
+			return old;
+	}
+}
+
 #pragma textflag NOSPLIT
 void
 runtime·procyield(uint32 cnt)
-- 
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