From e84ce0802dac6d5a780acc2f54113b55f49f4b07 Mon Sep 17 00:00:00 2001
From: Joel Sing <joel@sing.id.au>
Date: Thu, 17 Nov 2022 12:51:56 +1100
Subject: [PATCH] runtime: change tfork behaviour to unbreak openbsd/mips64

Currently, tfork on openbsd/mips64 returns the thread ID on success and
a negative error number on error. In CL#447175, newosproc was changed
to assume that a non-zero value is an error - return zero on success to
match this expectation.

Change-Id: I955efad49b149146165eba3d05fe40ba75caa098
Reviewed-on: https://go-review.googlesource.com/c/go/+/451257
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Joedian Reid <joedian@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Joel Sing <joel@sing.id.au>
---
 src/runtime/sys_openbsd_mips64.s | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/runtime/sys_openbsd_mips64.s b/src/runtime/sys_openbsd_mips64.s
index cc37e52e16..affd586742 100644
--- a/src/runtime/sys_openbsd_mips64.s
+++ b/src/runtime/sys_openbsd_mips64.s
@@ -277,7 +277,7 @@ TEXT runtime·tfork(SB),NOSPLIT,$0
 
 	// In parent, return.
 	BEQ	R2, 3(PC)
-	MOVW	R2, ret+40(FP)
+	MOVW	$0, ret+40(FP)
 	RET
 
 	// Initialise m, g.
-- 
2.50.0