[v2] powerpc/sstep.c - Fix emulation fall-through

[Michael Ellerman]

On Tue, 2016-16-02 at 06:31:53 UTC, Oliver O'Halloran wrote:
> There is a switch fallthough in instr_analyze() which can cause
> an invalid instruction to be emulated as a different, valid,
> instruction. The rld* (opcode 30) case extracts a sub-opcode from
> bits 3:1 of the instruction word. However, the only valid values
> of this field a 001 and 000. These cases are correctly handled,
> but the others are not which causes execution to fall through
> into case 31.
> 
> Breaking out of the switch causes the instruction to be marked as
> unknown and allows the caller to deal with the invalid instruction
> in a manner consistent with other invalid instructions.
> 
> Signed-off-by: Oliver O'Halloran <oohall at gmail.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/ab66c8ca52f790d816e421d3b1

cheers