From c8402cd33046e54c7e6530b458dfc21111d7ce64 Mon Sep 17 00:00:00 2001
From: Guoqi Chen <chenguoqi@loongson.cn>
Date: Mon, 4 Jul 2022 14:29:52 +0800
Subject: [PATCH] runtime: remove the fake mstart caller in systemstack on
 linux/loong64

The backtrace knows to stop in the system stack due to writing to the SP,
so here the fake mstart caller in the system stack is no longer needed and
can be removed

ref. CL 288799

Change-Id: I0841e75fd515cf6a0d98abe4cffc3f63fc275e0e
Reviewed-on: https://go-review.googlesource.com/c/go/+/416035
Auto-Submit: Wayne Zuo <wdvxdr@golangcn.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: WANG Xuerui <git@xen0n.name>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Wayne Zuo <wdvxdr@golangcn.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
---
 src/runtime/asm_loong64.s | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/src/runtime/asm_loong64.s b/src/runtime/asm_loong64.s
index a64b0adf9c..e226bda36f 100644
--- a/src/runtime/asm_loong64.s
+++ b/src/runtime/asm_loong64.s
@@ -186,10 +186,6 @@ switch:
 	MOVV	R5, g
 	JAL	runtime·save_g(SB)
 	MOVV	(g_sched+gobuf_sp)(g), R19
-	// make it look like mstart called systemstack on g0, to stop traceback
-	ADDV	$-8, R19
-	MOVV	$runtime·mstart(SB), R6
-	MOVV	R6, 0(R19)
 	MOVV	R19, R3
 
 	// call target function
-- 
2.50.0