[src/trunk]: src/sys/arch/arm/arm32 Make sure SPSR[23:8] is set to a known va...

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

details:   https://anonhg.NetBSD.org/src/rev/5da098c43fbb
branches:  trunk
changeset: 781756:5da098c43fbb
user:      matt <matt%NetBSD.org@localhost>
date:      Thu Sep 27 21:28:13 2012 +0000

description:
Make sure SPSR[23:8] is set to a known valid value (taken from CPSR).

diffstat:

 sys/arch/arm/arm32/locore.S |  7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diffs (28 lines):

diff -r df88e7e4491c -r 5da098c43fbb sys/arch/arm/arm32/locore.S
--- a/sys/arch/arm/arm32/locore.S       Thu Sep 27 20:43:15 2012 +0000
+++ b/sys/arch/arm/arm32/locore.S       Thu Sep 27 21:28:13 2012 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: locore.S,v 1.28 2012/09/03 22:49:54 matt Exp $ */
+/*     $NetBSD: locore.S,v 1.29 2012/09/27 21:28:13 matt Exp $ */
 
 /*
  * Copyright (C) 1994-1997 Mark Brinicombe
@@ -42,7 +42,7 @@
 /* What size should this really be ? It is only used by init_arm() */
 #define INIT_ARM_STACK_SIZE    2048
 
-       RCSID("$NetBSD: locore.S,v 1.28 2012/09/03 22:49:54 matt Exp $")
+       RCSID("$NetBSD: locore.S,v 1.29 2012/09/27 21:28:13 matt Exp $")
 
 /*
  * This is for kvm_mkdb, and should be the address of the beginning
@@ -55,6 +55,9 @@
 ENTRY_NP(kernel_text)
 
 ASENTRY_NP(start)
+       mrs     r1, cpsr                /* fetch CPSR value */
+       msr     spsr_sx, r1             /* set SPSR[23:8] to known value */
+
        adr     r1, .Lstart
        ldmia   r1, {r1, r2, r8, sp}    /* Set initial stack and */
        sub     r2, r2, r1              /* get zero init data and cpu_info_store */