From: Guoqi Chen <chenguoqi@loongson.cn>
Date: Tue, 26 Nov 2024 09:10:32 +0000 (+0800)
Subject: runtime: use correct memory barrier in exitThread function on loong64
X-Git-Tag: go1.25rc1~888
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=11c847e536bff955eab65cc0a3008557362dda22;p=gostls13.git

runtime: use correct memory barrier in exitThread function on loong64

In the runtime.exitThread function, a storeRelease barrier
is required instead of a full barrier.

Change-Id: I2815ddb03e4984c891d71811ccf650a82325e10d
Reviewed-on: https://go-review.googlesource.com/c/go/+/631915
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Meidan Li <limeidan@loongson.cn>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: sophie zhao <zhaoxiaolin@loongson.cn>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
---

diff --git a/src/runtime/sys_linux_loong64.s b/src/runtime/sys_linux_loong64.s
index 57cee99da7..914da6c043 100644
--- a/src/runtime/sys_linux_loong64.s
+++ b/src/runtime/sys_linux_loong64.s
@@ -57,10 +57,8 @@ TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0-4
 TEXT runtime·exitThread(SB),NOSPLIT|NOFRAME,$0-8
 	MOVV	wait+0(FP), R19
 	// We're done using the stack.
-	MOVW	$0, R11
-	DBAR
-	MOVW	R11, (R19)
-	DBAR
+	DBAR	$0x12	// StoreRelease barrier
+	MOVW	R0, (R19)
 	MOVW	$0, R4	// exit code
 	MOVV	$SYS_exit, R11
 	SYSCALL