This is a note to let you know that I've just added the patch titled
powerpc/sstep: Fix darn emulation
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-sstep-fix-darn-emulation.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit c2423cdd0b8bbec3fb4ad55d734707328bfd863b
Author: Sandipan Das <sandipan@xxxxxxxxxxxxx>
Date: Thu Feb 4 13:37:44 2021 +0530
powerpc/sstep: Fix darn emulation
[ Upstream commit 22b89ba178dd0a66a26699ead014a3e73ff8e044 ]
Commit 8813ff49607e ("powerpc/sstep: Check instruction validity
against ISA version before emulation") introduced a proper way to skip
unknown instructions. This makes sure that the same is used for the
darn instruction when the range selection bits have a reserved value.
Fixes: a23987ef267a ("powerpc: sstep: Add support for darn instruction")
Signed-off-by: Sandipan Das <sandipan@xxxxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210204080744.135785-2-sandipan@xxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
index 0f228ee11ca4..a2e067f68dee 100644
--- a/arch/powerpc/lib/sstep.c
+++ b/arch/powerpc/lib/sstep.c
@@ -1853,7 +1853,7 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
goto compute_done;
}
- return -1;
+ goto unknown_opcode;
#ifdef __powerpc64__
case 777: /* modsd */
if (!cpu_has_feature(CPU_FTR_ARCH_300))
