Re: cgen -> opcodes problem

[Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>]

On Mon, Dec 28, 2009 at 10:04 PM, Doug Evans <dje@sebabeach.org> wrote:
> Dmitry Eremin-Solenikov wrote:
>>
>> Hello all,
>>
>> I'm back to my m68hc08 binutils port done via cgen.
>> Recently I've again stumbled upon a problem with instructions,
>> whose base? length != ISA base length.
>>
>> E.g. in the attached stripped test case, the 'ttt' instruction either
>> (should be assembled as 0x9E 0xF1) is misencoded as 0xsmth 0x00.
>> Is this my fault? Or is this the expected behaviour and I should define
>> f-seccode in some other way?
>>
>> Could you please help me?
>>
>>
>
> Hi.  cgen currently doesn't handle instructions with opcode bits beyond the
> base insn size very well.  I have a sandbox with this fixed, but it'll be
> awhile (month or more?) before it all gets checked in.
>
> In the meantime, setting base-insn-bitsize to 16 may work.  [It *should*
> work, but there may be attributes of your port I haven't taken into
> account.]

I haven't dig into that, but setting base-insn-bitsize to 16 broke
disassembler badly.


-- 
With best wishes
Dmitry