Re-compiling code

[Programmer]

You really make this sound easy...
Lyndon.
----- Original Message -----
From: Scot Sealander <Sealand at clarityconnect.com>
To: <gmecm at diy-efi.org>
Sent: Thursday, January 25, 2001 4:19 PM
Subject: Re: Re-compiling code


> Shannen Durphey wrote:
>
> > I have a binary and uncommented disassembly of an ecm's code.
>
> The original binary?  Save it for comparison.  Commented or uncommented
> will make no difference to the assembler. (Assuming properly commented!)
>
>
> > I need to add four lines of code in one area, and I have another
> > area where I can remove up to 6 lines of code.
>
> > How can I make these changes a little less painful?
>
> Where to start.....  Use the assembler written by the guy who wrote
> the disassembler.  Ensures the best compatibility.  Does the disassembly
> re-assemble without error back to the original binary?  That is the
> next rule after the first.  If this does not happen, find out what
> the error is first, before going any farther.  Your added code won't
> do any good if you can't get a good original re-assembly.
>
> Now, once you get it to re-assemble back to original, start looking
> for absolute addresses in the listing.  These addresses are pointing
> to something, and if your code moves things, these will end up pointing
> at something other than what you wanted.  Now, replace those absolute
> addresses with labels.  Make sure it re-assembles to original (yes
> again.)
>
> Now you are probably in good enough shape to add code or delete code.
> Careful if adding code, you may move some branches out of range, if you
> add too much.  Above all, keep calm, you can always start over again.
> :-)
>
> Scot Sealander
>
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