1//===-- sync_synchronize - Implement memory barrier * ----------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is dual licensed under the MIT and the University of Illinois Open
6// Source Licenses. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#include "../assembly.h"
11
12//
13// When compiling a use of the gcc built-in __sync_synchronize() in thumb1 mode
14// the compiler may emit a call to __sync_synchronize.
15// On Darwin the implementation jumps to an OS supplied function named
16// OSMemoryBarrier
17//
18
19	.text
20	.syntax unified
21
22#if __APPLE__
23
24	.align 2
25DEFINE_COMPILERRT_PRIVATE_FUNCTION(__sync_synchronize)
26	stmfd	sp!, {r7, lr}
27	add		r7, sp, #0
28	bl		_OSMemoryBarrier
29	ldmfd	sp!, {r7, pc}
30
31	// tell linker it can break up file at label boundaries
32	.subsections_via_symbols
33
34#endif
35