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127 Views 2 Replies Last post: Feb 4, 2010 3:19 PM by BenBreeg RSS
BenBreeg Newbie
BenBreeg
5 posts since
Jan 26, 2010
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Feb 2, 2010 5:37 AM

Does anybody recognise these opcodes?

This is a snippet of code from an unknown Mitsubishi MCU MH8110. I'm having trouble figuring out what the core might be.

 

00006fc0    24 71 00 80 d1 01 48 13 71 7f e7 f5 34 6b 80 20    .q....H.q...4k..
00006fd0    1c 61 00 02 79 ff f8 d3 78 05 ec c5 1c 61 00 02    .a..y...x....a..
00006fe0    1c 8d bc 40 1c ad bc 42 79 ff f8 dd c1 01 00 90    ...@...By.......
00006ff0    20 71 00 04

 

I suspect that 2471 at the start of the function might be pushing a register onto the stack and 2071 at the end would be popping it prior to 0004 rts.

But I can't find any disassembler that will turn this into sensible code. Any ideas?

ckgrier Novice
ckgrier
745 posts since
Mar 16, 2009
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1. Feb 3, 2010 7:24 AM in response to: BenBreeg
Re: Does anybody recognise these opcodes?

Are you trying to reverse engineer undocumented assembly code so you can change it? or are you just curious what core was used on an old chip?

BenBreeg Newbie
BenBreeg
5 posts since
Jan 26, 2010
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2. Feb 4, 2010 3:19 PM in response to: ckgrier
Re: Does anybody recognise these opcodes?

Yes exactly that. I am trying to reverse engineer some undocumented code. I need to figure out what the core is so I can find or write a disassembler for it.

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