[src/trunk]: src/sys/arch/amd64/amd64 Don't restore segment registers when le...

[maxv <maxv%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/82af609f2560
branches:  trunk
changeset: 829721:82af609f2560
user:      maxv <maxv%NetBSD.org@localhost>
date:      Fri Feb 09 08:54:11 2018 +0000

description:
Don't restore segment registers when leaving NMIs. In nmitrap (and the
functions it later calls), we are not allowing the trap frame to change;
so the segregs don't change since we are running with interrupts disabled
and there is no rescheduling in this case.

diffstat:

 sys/arch/amd64/amd64/amd64_trap.S |  4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)

diffs (18 lines):

diff -r f314bc11a4ab -r 82af609f2560 sys/arch/amd64/amd64/amd64_trap.S
--- a/sys/arch/amd64/amd64/amd64_trap.S Fri Feb 09 08:42:26 2018 +0000
+++ b/sys/arch/amd64/amd64/amd64_trap.S Fri Feb 09 08:54:11 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: amd64_trap.S,v 1.23 2018/01/21 11:21:40 maxv Exp $     */
+/*     $NetBSD: amd64_trap.S,v 1.24 2018/02/09 08:54:11 maxv Exp $     */
 
 /*
  * Copyright (c) 1998, 2007, 2008, 2017 The NetBSD Foundation, Inc.
@@ -162,8 +162,6 @@
        SVS_LEAVE_ALTSTACK
 
 .Lnmileave:
-       movw    TF_ES(%rsp),%es
-       movw    TF_DS(%rsp),%ds
        INTR_RESTORE_GPRS
        addq    $TF_REGSIZE+16,%rsp
        iretq