From 22011f8b6c06eb63ffd5f2c01d2da89ff57fa4bc Mon Sep 17 00:00:00 2001
From: Adrien Destugues <pulkomandy@pulkomandy.tk>
Date: Sun, 23 Feb 2014 16:25:34 +0100
Subject: [PATCH] ARM Atomics: implement __sync_syncronize

GCC doesn't provide an ARM implementation of it. It's easy to write one
for ARMv6 and above, while older archs will need this implemented as a
syscall just like other atomics.
---
 src/system/libroot/os/arch/arm/atomic.S | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/system/libroot/os/arch/arm/atomic.S b/src/system/libroot/os/arch/arm/atomic.S
index 56bddd9875..31068b2802 100644
--- a/src/system/libroot/os/arch/arm/atomic.S
+++ b/src/system/libroot/os/arch/arm/atomic.S
@@ -88,6 +88,13 @@ FUNCTION(atomic_get):
         bx	lr
 FUNCTION_END(atomic_get)
 
+/* void __sync_synchronize(void)
+ */
+FUNCTION(__sync_synchronize):
+	dmb
+	bx lr
+FUNCTION_END(__sync_synchronize)
+
 #endif /* ATOMIC_FUNCS_ARE_SYSCALLS */
 
 #ifndef ATOMIC64_FUNCS_ARE_SYSCALLS