linux-kernel - [PATCH 5.18 015/102] parisc/unaligned: Fix emulate

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Date:   Tue,  5 Jul 2022 13:57:41 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Helge Deller <deller@....de>
Subject: [PATCH 5.18 015/102] parisc/unaligned: Fix emulate_ldw() breakage

From: Helge Deller <deller@....de>

commit 96b80fcd2705fc50ebe1f7f3ce204e861b3099ab upstream.

The commit e8aa7b17fe41 broke the 32-bit load-word unalignment exception
handler because it calculated the wrong amount of bits by which the value
should be shifted. This patch fixes it.

Signed-off-by: Helge Deller <deller@....de>
Fixes: e8aa7b17fe41 ("parisc/unaligned: Rewrite inline assembly of emulate_ldw()")
Cc: stable@...r.kernel.org   # v5.18
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/parisc/kernel/unaligned.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/parisc/kernel/unaligned.c b/arch/parisc/kernel/unaligned.c
index ed1e88a74dc4..bac581b5ecfc 100644
--- a/arch/parisc/kernel/unaligned.c
+++ b/arch/parisc/kernel/unaligned.c
@@ -146,7 +146,7 @@ static int emulate_ldw(struct pt_regs *regs, int toreg, int flop)
 "	depw	%%r0,31,2,%4\n"
 "1:	ldw	0(%%sr1,%4),%0\n"
 "2:	ldw	4(%%sr1,%4),%3\n"
-"	subi	32,%4,%2\n"
+"	subi	32,%2,%2\n"
 "	mtctl	%2,11\n"
 "	vshd	%0,%3,%0\n"
 "3:	\n"
-- 
2.37.0