[PARISC] fix crash in flush_icache_page_asm on PA1.1

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 f311847c2fcebd81912e2f0caf8a461dec28db41
    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>
Cc: stable@vger.kernel.org	#2.6.39+
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

diff --git a/arch/parisc/kernel/pacache.S b/arch/parisc/kernel/pacache.S
index 93ff3d9..5d7218a 100644 (file)
--- a/arch/parisc/kernel/pacache.S
+++ b/arch/parisc/kernel/pacache.S
@@ -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