| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.11 425/775] powerpc/sstep: Fix darn emulation | Date | Mon, 1 Mar 2021 17:09:53 +0100 |
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From: Sandipan Das <sandipan@linux.ibm.com>
[ 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@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210204080744.135785-2-sandipan@linux.ibm.com Signed-off-by: Sasha Levin <sashal@kernel.org> --- arch/powerpc/lib/sstep.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c index 25cfa9c622c58..bb5c20d4ca91c 100644 --- a/arch/powerpc/lib/sstep.c +++ b/arch/powerpc/lib/sstep.c @@ -1918,7 +1918,7 @@ 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)) -- 2.27.0
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