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 597e0cc6b90ed35d5ce3a9ebc6a2a526711bd7d3..d731871d4494fe85c093cebae0159e7a10e61bd3 100644 (file)
--- 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)