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PARISC: fix crash in flush_icache_page_asm on PA1.1

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commit 207f583d71 upstream.

As pointed out by serveral people, PA1.1 only has a type 26 instruction
meaning that the space register must be explicitly encoded.  Not giving an
explicit space means that the compiler uses the type 24 version which is PA2.0
only resulting in an illegal instruction crash.

This regression was caused by

    commit f311847c2f
    Author: James Bottomley <James.Bottomley@HansenPartnership.com>
    Date:   Wed Dec 22 10:22:11 2010 -0600

        parisc: flush pages through tmpalias space

Reported-by: Helge Deller <deller@gmx.de>
Signed-off-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
John David Anglin 2012-05-16 10:14:52 +01:00 committed by Greg Kroah-Hartman
parent 31df6ef255
commit 0e963bc00d
1 changed files with 20 additions and 18 deletions
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38
arch/parisc/kernel/pacache.S
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@ -692,7 +692,7 @@ ENTRY(flush_icache_page_asm)
/* Purge any old translation */
pitlb (%sr0,%r28)
pitlb (%sr4,%r28)
ldil L%icache_stride, %r1
ldw R%icache_stride(%r1), %r1
@ -706,27 +706,29 @@ ENTRY(flush_icache_page_asm)
sub %r25, %r1, %r25
1: fic,m %r1(%r28)
fic,m %r1(%r28)
fic,m %r1(%r28)
fic,m %r1(%r28)
fic,m %r1(%r28)
fic,m %r1(%r28)
fic,m %r1(%r28)
fic,m %r1(%r28)
fic,m %r1(%r28)
fic,m %r1(%r28)
fic,m %r1(%r28)
fic,m %r1(%r28)
fic,m %r1(%r28)
fic,m %r1(%r28)
fic,m %r1(%r28)
/* fic only has the type 26 form on PA1.1, requiring an
* explicit space specification, so use %sr4 */
1: fic,m %r1(%sr4,%r28)
fic,m %r1(%sr4,%r28)
fic,m %r1(%sr4,%r28)
fic,m %r1(%sr4,%r28)
fic,m %r1(%sr4,%r28)
fic,m %r1(%sr4,%r28)
fic,m %r1(%sr4,%r28)
fic,m %r1(%sr4,%r28)
fic,m %r1(%sr4,%r28)
fic,m %r1(%sr4,%r28)
fic,m %r1(%sr4,%r28)
fic,m %r1(%sr4,%r28)
fic,m %r1(%sr4,%r28)
fic,m %r1(%sr4,%r28)
fic,m %r1(%sr4,%r28)
cmpb,COND(<<) %r28, %r25,1b
fic,m %r1(%r28)
fic,m %r1(%sr4,%r28)
sync
bv %r0(%r2)
pitlb (%sr0,%r25)
pitlb (%sr4,%r25)
.exit
.procend