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Re: [Qemu-devel] [PATCH 00/52] 680x0 instructions emulation

From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH 00/52] 680x0 instructions emulation
Date: Fri, 6 May 2016 13:03:14 +0100

On 6 May 2016 at 12:57, Laurent Vivier <address@hidden> wrote:
> Le 06/05/2016 à 13:45, Alexander Graf a écrit :
>> Awesome, do you think you could port risu to 68k?
>>   https://git.linaro.org/people/peter.maydell/risu.git/
>> I was amazed by the quality the aarch64 emulation received once it was
>> properly testable.
> I've already had a look at risu for that.
> But risu uses a perl scripts to generate the instruction from the .risu
> file, and it is very ARM specific (and I don't like perl :) )

Yeah, the risugen script is the most awkward part for porting to
a new architecture. It needs restructuring to make it properly
architecture-independent (with a subclass per architecture, and
some kind of architecture specification directive in the input file.)

This is one of those awkward step-points where the first person to
need to add a different architecture has the pain of doing the
restructuring but then everybody else gets a much easier job later.

The rest of risu (the C code) is much better factored out to
allow new architectures to be slotted in.

-- PMM

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