[PATCH 4.19 04/34] parisc/unaligned: Fix ldw() and stw() unalignment handlers

Greg Kroah-Hartman
2022-02-28T17:33:22Z

From: Helge Deller <deller@gmx.de>

commit a97279836867b1cb50a3d4f0b1bf60e0abe6d46c upstream.

Fix 3 bugs:

a) emulate_stw() doesn't return the error code value, so faulting
instructions are not reported and aborted.

b) Tell emulate_ldw() to handle fldw_l as floating point instruction

c) Tell emulate_ldw() to handle ldw_m as integer instruction

Signed-off-by: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/parisc/kernel/unaligned.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

--- a/arch/parisc/kernel/unaligned.c
+++ b/arch/parisc/kernel/unaligned.c
@@ -354,7 +354,7 @@ static int emulate_stw(struct pt_regs *r
: "r" (val), "r" (regs->ior), "r" (regs->isr)
: "r19", "r20", "r21", "r22", "r1", FIXUP_BRANCH_CLOBBER );

- return 0;
+ return ret;
}
static int emulate_std(struct pt_regs *regs, int frreg, int flop)
{
@@ -633,10 +633,10 @@ void handle_unaligned(struct pt_regs *re
{
case OPCODE_FLDW_L:
flop=1;
- ret = emulate_ldw(regs, R2(regs->iir),0);
+ ret = emulate_ldw(regs, R2(regs->iir), 1);
break;
case OPCODE_LDW_M:
- ret = emulate_ldw(regs, R2(regs->iir),1);
+ ret = emulate_ldw(regs, R2(regs->iir), 0);
break;