[src/trunk]: src/sys/arch/macppc/macppc Explicitly zero SPRG0 before doing an...

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

details:   https://anonhg.NetBSD.org/src/rev/d6ea38a9704a
branches:  trunk
changeset: 372636:d6ea38a9704a
user:      macallan <macallan%NetBSD.org@localhost>
date:      Wed Dec 14 13:04:24 2022 +0000

description:
Explicitly zero SPRG0 before doing anything else - it's used to store a pointer
to struct cpuinfo, this way we can catch attempts to use it before it's set
up properly

diffstat:

 sys/arch/macppc/macppc/locore.S |  5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diffs (19 lines):

diff -r 0af3bb63bd47 -r d6ea38a9704a sys/arch/macppc/macppc/locore.S
--- a/sys/arch/macppc/macppc/locore.S   Wed Dec 14 12:31:15 2022 +0000
+++ b/sys/arch/macppc/macppc/locore.S   Wed Dec 14 13:04:24 2022 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: locore.S,v 1.79 2021/02/26 02:18:56 thorpej Exp $      */
+/*     $NetBSD: locore.S,v 1.80 2022/12/14 13:04:24 macallan Exp $     */
 
 /*
  * Copyright (C) 1995, 1996 Wolfgang Solfrank.
@@ -92,6 +92,9 @@
        mr      %r13,%r6
        mr      %r14,%r7
 
+       li      %r0,0
+       mtsprg0 %r0
+
        bl      _C_LABEL(ofwinit)               /* init OF */
 
        li      %r0,0