2021-08-03 21:48:40 +00:00
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<title>Suggestions - SourceGen Tutorial</title>
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6502bench
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//
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<ul>
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<li id="sidenav-index"><a href="./">Introduction</a></li>
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<li id="sidenav-about-disasm"><a href="about-disasm.html">About Disassembly</a></li>
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<li id="sidenav-using-sourcegen"><a href="using-sourcegen.html">Using SourceGen</a>
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<li id="sidenav-moving-around"><a href="moving-around.html">Moving Around</a></li>
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</ul></li>
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<li id="sidenav-suggestions" class="active"><a href="suggestions.html">Suggestions</a></li>
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<div id="main">
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<h2>A Few Suggestions</h2>
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<p>The hardest step in a journey is often the first. Here are a few
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suggestions to help you on your way.</p>
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<ul>
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<li>Start with a small project (< 1KB). If you haven't
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disassembled code before, this is the time to play with different
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conventions, like whether to use MixedCase or underscore_separated
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or SCREAMING_CAPS for labels.</li>
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<li>Use the program thoroughly. Understand all of what it does.</li>
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<li>Begin each project by separating code from data. Identify external
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entry points, format tables of addresses, and find JSRs that are
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followed by inline data. Write an extension script to handle the
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inlines so you won't keep tripping over them. If parts of the program
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are relocated to a different address, set the appropriate address
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overrides. Progress will be easier once you get code, data, and junk
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2021-08-09 23:17:58 +00:00
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identified and arranged in memory.
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<ul>
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<li>Code start tags are rarely needed, and code end tags are almost never
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needed. You shouldn't have to spend a lot of time manually tagging things.
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If a piece of code isn't being found, it's usually best to figure out why
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the code that calls it isn't being found, instead of trying to tag it and
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forge ahead. It might be dead code that's never called, or it might be
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called from a table that you can format to add code entry tags for
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multiple addresses with a single operation.</li>
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</ul></li>
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2021-08-03 21:48:40 +00:00
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<li>Start with easily identifiable pieces. If a chunk of code is reading
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from the keyboard, you can make reasonable guesses about the purpose of
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the code that interacts with it.
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2021-08-09 23:17:58 +00:00
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The start of the program is often the hardest place to begin, because it
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2021-08-03 21:48:40 +00:00
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usually just initializes a bunch of stuff you haven't identified.</li>
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<li>Expect to figure out little pieces. Use what you learn from these
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to figure out other little pieces. It's a jigsaw puzzle, not a book.</li>
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<li>Don't get discouraged if there's a ton of code that you can't make
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sense of. It won't at first. Keep chipping away.</li>
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<li>Read <a href="https://6502disassembly.com/on-disassembly.html">On Disassembly</a>
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for additional thoughts.</li>
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</ul>
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