From: Guoqi Chen <chenguoqi@loongson.cn>
Date: Thu, 5 Jun 2025 11:23:55 +0000 (+0800)
Subject: runtime: check for gsignal in racecall on loong64
X-Git-Tag: go1.25rc1~2^2~2
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=d184f8dc02;p=gostls13.git

runtime: check for gsignal in racecall on loong64

This issue has been fixed for amd64, arm64 and other platforms
in CL 643875, but it was missed when the race support was
submitted for loong64.

Fixes #71395.

Change-Id: I678f381e868214f1b3399be43187db49e1660933
Reviewed-on: https://go-review.googlesource.com/c/go/+/679055
Reviewed-by: Meidan Li <limeidan@loongson.cn>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: sophie zhao <zhaoxiaolin@loongson.cn>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
---

diff --git a/src/runtime/race_loong64.s b/src/runtime/race_loong64.s
index 597e0cc6b9..d731871d44 100644
--- a/src/runtime/race_loong64.s
+++ b/src/runtime/race_loong64.s
@@ -461,8 +461,13 @@ TEXT	racecall<>(SB), NOSPLIT|NOFRAME, $0-0
 	// Switch to g0 stack.
 	MOVV	R3, R23	// callee-saved, preserved across the CALL
 	MOVV	R1, R24	// callee-saved, preserved across the CALL
+
+	// Switch to g0 stack if we aren't already on g0 or gsignal.
+	MOVV	m_gsignal(R12), R13
+	BEQ	R13, g, call
+
 	MOVV	m_g0(R12), R13
-	BEQ	R13, g, call	// already on g0
+	BEQ	R13, g, call
 	MOVV	(g_sched+gobuf_sp)(R13), R3
 call:
 	JAL	(RCALL)