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target-mips: add mips16 instruction decoding
There's no good way to add this incrementally, so we do it all at once. The only changes to shared code are in handle_delay_slot. We need to flip ISAMode when doing a jump-and-exchange. We also need to set ISAMode the low bit of the target address for jump-to-register. Also, since we're now adding bits that can be in MIPS_HFLAG_BMASK_EXT, make sure we use MIPS_HFLAG_BMASK_BASE in the places where we just want basic information about a branch. Signed-off-by: Nathan Froyd <froydnj@codesourcery.com> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
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