Subject:
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Re: Perl-based H300 disassembler
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 18 Nov 1998 01:50:42 GMT
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Original-From:
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Bob Wind <rwind@gfn.=spamcake=org>
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Viewed:
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2223 times
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----------
> From: Bob Wind <rwind@gfn.org>
> To: lego-robotics@crynwr.com
> Subject: Re: Perl-based H300 disassembler
> Date: Monday, October 26, 1998 5:39 PM
>
>
>
> ----------
> > From: Gary Kacmarcik <garykac@hotmail.com>
> > I've written a H300 disassembler in Perl for those who are interested.
>
> I was scanning through your Perl code for the disassembler, and I think
> that I saw a bug.
> The last few lines of the file are supposed to define the 6F opcode, but
> the encode =>
> section has the binary code 01101110 which is 6E.
>
> I used this dissembler on my firmware file, and it has been very helpful.
> I just wondered
> if this was a minor error.
>
> Bob Wind
> rwind at gfn dot org
It looks like there is a problem with the 7D opcodes in my diassembly
of the firmware from this disassembler. The disassembly of the
Firm0309.lgo firmware file only has a few locations where the 7D
opcode is used, and they all decode to a bset rhl,@r2 instruction.
For example:
0080FA 7D607070 bset r7h,@r6
0083A4 7D407270 bset r7h,@r4
00864A 7D507100 bset r0h,@r5
0087FE 7D607100 bset r0h,@r6
00889C 7D607100 bset r0h,@r6
008AA6 7D607100 bset r0h,@r6
The encode sections in the PERL disassembler look like the above
lines should be:
0080FA 7D607070 bset #7,@r6
0083A4 7D407270 bclr #7,@r4
00864A 7D507100 bnot #0,@r5
0087FE 7D607100 bnot #0,@r6
00889C 7D607100 bnot #0,@r6
008AA6 7D607100 bnot #0,@r6
Bob Wind
rwind at gfn dot org
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