From 069aef4067480ab29f5788b31171054954577661 Mon Sep 17 00:00:00 2001
From: Tobias Klauser <tklauser@distanz.ch>
Date: Thu, 1 Oct 2020 10:25:20 +0200
Subject: [PATCH] syscall: use correct cmsg alignment for netbsd/arm64

netbsd/arm64 requires 128-bit alignment for cmsgs.

Re-submit of CL 258437 which was dropped due to #41718.

Change-Id: I898043d79f513bebe1a5eb931e7ebd8e291a5aec
Reviewed-on: https://go-review.googlesource.com/c/go/+/258677
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Trust: Benny Siegert <bsiegert@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Benny Siegert <bsiegert@gmail.com>
---
 src/syscall/sockcmsg_unix_other.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/syscall/sockcmsg_unix_other.go b/src/syscall/sockcmsg_unix_other.go
index 3aaf7c3616..40f03142a6 100644
--- a/src/syscall/sockcmsg_unix_other.go
+++ b/src/syscall/sockcmsg_unix_other.go
@@ -32,6 +32,10 @@ func cmsgAlignOf(salen int) int {
 		if runtime.GOARCH == "arm" {
 			salign = 8
 		}
+		// NetBSD aarch64 requires 128-bit alignment.
+		if runtime.GOOS == "netbsd" && runtime.GOARCH == "arm64" {
+			salign = 16
+		}
 	}
 
 	return (salen + salign - 1) & ^(salign - 1)
-- 
2.48.1