From 7f6fb9ce1cdd20b4c57dd402154b21587b0eb3c9 Mon Sep 17 00:00:00 2001
From: guoshichao <guoshichao@xiaomi.com>
Date: Mon, 5 Aug 2024 14:20:18 +0800
Subject: [PATCH] greenhills: add the "__sync_synchronize" func impl

we add ghs header file support using to fix the following link error:
[elxr] (error #412) unresolved symbols: 1
 __sync_synchronize 	from libopenamp.a(io.o)

Signed-off-by: guoshichao <guoshichao@xiaomi.com>
---
 libs/libc/machine/arch_atomic.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/libs/libc/machine/arch_atomic.c b/libs/libc/machine/arch_atomic.c
index efb7238888..0db93e79b2 100644
--- a/libs/libc/machine/arch_atomic.c
+++ b/libs/libc/machine/arch_atomic.c
@@ -754,3 +754,16 @@ SYNC_VAL_CMP_SWAP(4, uint32_t)
 SYNC_VAL_CMP_SWAP(8, uint64_t)
 
 #endif /* __clang__ */
+
+#ifdef __ghs__
+
+/****************************************************************************
+ * Name: __sync_synchronize
+ ****************************************************************************/
+
+void weak_function __sync_synchronize(void)
+{
+  asm volatile("" ::: "memory");
+}
+
+#endif