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6502bench/docs/sgtutorial/digging-deeper.html

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Execute scripts This change applies the substitution scripts on the HTML files, replacing away the jQuery load() calls with the actual file contents, and setting the correct URLs to the prev/next buttons.
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<!DOCTYPE html>
<html lang="en">
<head>
Add ${ROOT} substitution Doesn't really affect the pages on the web, but it's easier to preview them in the filesystem when linked to "../main.css" rather than "/main.css". The common portion of the <head> section is now in a separate "include" file. Added some indentation to masthead/topnav/sidenav so it looks nicer in the merged source listing.
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<!-- START: /head-incl.html -->
<!-- common head elements -->
Execute scripts This change applies the substitution scripts on the HTML files, replacing away the jQuery load() calls with the actual file contents, and setting the correct URLs to the prev/next buttons.
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<meta charset="utf-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"
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<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css"/>
Add ${ROOT} substitution Doesn't really affect the pages on the web, but it's easier to preview them in the filesystem when linked to "../main.css" rather than "/main.css". The common portion of the <head> section is now in a separate "include" file. Added some indentation to masthead/topnav/sidenav so it looks nicer in the merged source listing.
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<link rel="stylesheet" href="../main.css"/>
<!-- END: /head-incl.html -->
Execute scripts This change applies the substitution scripts on the HTML files, replacing away the jQuery load() calls with the actual file contents, and setting the correct URLs to the prev/next buttons.
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<title>Digging Deeper - SourceGen Tutorial</title>
</head>
<body>
<div id="masthead">
<!-- START: /masthead-incl.html -->
Add ${ROOT} substitution Doesn't really affect the pages on the web, but it's easier to preview them in the filesystem when linked to "../main.css" rather than "/main.css". The common portion of the <head> section is now in a separate "include" file. Added some indentation to masthead/topnav/sidenav so it looks nicer in the merged source listing.
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<!--<div class="masthead-title" style="background-image: url('images/screenshot-mainwin.png');">-->
<div class="masthead-title">
6502bench
</div>
Execute scripts This change applies the substitution scripts on the HTML files, replacing away the jQuery load() calls with the actual file contents, and setting the correct URLs to the prev/next buttons.
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<!-- END: /masthead-incl.html -->
</div>
<div id="topnav">
<!-- START: /topnav-incl.html active:#topnav-sgtutorial -->
Add ${ROOT} substitution Doesn't really affect the pages on the web, but it's easier to preview them in the filesystem when linked to "../main.css" rather than "/main.css". The common portion of the <head> section is now in a separate "include" file. Added some indentation to masthead/topnav/sidenav so it looks nicer in the merged source listing.
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<!-- top navigation bar contents -->
<nav>
<a id="topnav-home" href=".././">HOME</a>
<a id="topnav-sgtutorial" class="active" href="../sgtutorial">SourceGen Tutorial</a>
<a id="topnav-menuicon" href="javascript:void(0);" class="icon" onclick="toggleSidenav()">
<i class="fa fa-bars"></i>
</a>
</nav>
<script>
// Sidenav toggle function.
//
// Use a jQuery function to toggle the sidenav bar. The initial state
// is undefined / inherited, so it will pop in and out as the screen
// resizes around the "large" breakpoint.
function toggleSidenav() {
$("#sidenav").toggle("fast");
}
</script>
Execute scripts This change applies the substitution scripts on the HTML files, replacing away the jQuery load() calls with the actual file contents, and setting the correct URLs to the prev/next buttons.
2021-06-08 00:14:16 +00:00
<!-- END: /topnav-incl.html -->
</div>
<div id="sidenav">
<!-- START: sidenav-incl.html active:#sidenav-digging-deeper -->
Add ${ROOT} substitution Doesn't really affect the pages on the web, but it's easier to preview them in the filesystem when linked to "../main.css" rather than "/main.css". The common portion of the <head> section is now in a separate "include" file. Added some indentation to masthead/topnav/sidenav so it looks nicer in the merged source listing.
2021-06-28 20:37:26 +00:00
<!-- side navigation bar contents -->
Execute scripts This change applies the substitution scripts on the HTML files, replacing away the jQuery load() calls with the actual file contents, and setting the correct URLs to the prev/next buttons.
2021-06-08 00:14:16 +00:00
<ul>
Add ${ROOT} substitution Doesn't really affect the pages on the web, but it's easier to preview them in the filesystem when linked to "../main.css" rather than "/main.css". The common portion of the <head> section is now in a separate "include" file. Added some indentation to masthead/topnav/sidenav so it looks nicer in the merged source listing.
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<li id="sidenav-index"><a href="./">Introduction</a></li>
<li id="sidenav-about-disasm"><a href="about-disasm.html">About Disassembly</a></li>
<li id="sidenav-using-sourcegen"><a href="using-sourcegen.html">Using SourceGen</a>
<ul>
<li id="sidenav-moving-around"><a href="moving-around.html">Moving Around</a></li>
<li id="sidenav-simple-edits"><a href="simple-edits.html">Simple Edits</a></li>
<li id="sidenav-labels-symbols"><a href="labels-symbols.html">Labels &amp; Symbols</a></li>
<li id="sidenav-editing-data"><a href="editing-data.html">Editing Data Operands</a></li>
<li id="sidenav-generating-code"><a href="generating-code.html">Generating Code</a></li>
</ul></li>
<li id="sidenav-digging-deeper" class="active"><a href="digging-deeper.html">Digging Deeper</a>
<ul>
<li id="sidenav-string-formatting"><a href="string-formatting.html">String Formatting</a></li>
<li id="sidenav-local-variables"><a href="local-variables.html">Local Variables</a></li>
<li id="sidenav-inline-data"><a href="inline-data.html">Inline Data</a></li>
<li id="sidenav-odds-ends"><a href="odds-ends.html">Odds &amp; Ends</a></li>
</ul></li>
<li id="sidenav-advanced-topics"><a href="advanced-topics.html">Advanced Topics</a>
<ul>
<li id="sidenav-address-tables"><a href="address-tables.html">Address Tables</a></li>
<li id="sidenav-extension-scripts"><a href="extension-scripts.html">Extension Scripts</a></li>
<li id="sidenav-visualizations"><a href="visualizations.html">Visualizations</a></li>
</ul></li>
</ul>
Execute scripts This change applies the substitution scripts on the HTML files, replacing away the jQuery load() calls with the actual file contents, and setting the correct URLs to the prev/next buttons.
2021-06-08 00:14:16 +00:00
<!-- END: sidenav-incl.html -->
</div>
<div id="main">
<h2>Digging Deeper</h2>
<div class="grid-container">
<div class="grid-item-text">
<p>This tutorial will walk you through some of the fancier things SourceGen
can do. We assume you've already finished the basic features tutorial,
and know how to create projects and move around in them.</p>
<p>Start a new project. Select <samp>Generic 6502</samp>. For the
data file, navigate to the Examples directory, then from the Tutorial
directory select "Tutorial2".</p>
</div>
</div>
<div class="grid-container">
<div class="grid-item-image">
<img src="images/t2-tutorial-top.png" alt="t2-tutorial-top"/>
</div>
<div class="grid-item-text">
<p>Looking at the code list, the first thing you'll notice is that we
immediately ran into a
<code>BRK</code>, which is a pretty reliable sign that we're not in
a code section. This particular file begins with <code>00 20</code>, which
could be a load address (e.g. some C64 binaries look like this). So let's start
with that assumption.</p>
</div>
</div>
<div class="grid-container">
<div class="grid-item-text">
<p>As discussed in the introductory material, SourceGen separates code
from data by tracing all possible execution paths from declared entry
points. The generic profiles mark the first byte of the file as an entry
point, but that's wrong here. We want to change the entry point to
be after the 16-bit load address, at offset +000002.</p>
</div>
</div>
<div class="grid-container">
<div class="grid-item-image">
<img src="images/t2-1000-edit1.png" alt="t2-1000-edit1"/>
</div>
<div class="grid-item-text">
<p>Click on the first line of code at address $1000, and select
<samp>Actions &gt; Remove Analyzer Tags</samp>
(<kbd class="key">Ctrl+H</kbd> <kbd class="key">Ctrl+R</kbd>).
This removes the "code entry point" tag.
Unfortunately the $20 is still auto-detected as being part of a string
directive.</p>
</div>
</div>
<div class="grid-container">
<div class="grid-item-image">
<img src="images/t2-1000-edit2.png" alt="t2-1000-edit2"/>
</div>
<div class="grid-item-text">
<p>The string is making it hard to manipulate the next few bytes,
so let's fix that by selecting <samp>Edit &gt; Toggle Data Scan</samp>
(<kbd class="key">Ctrl+D</kbd>). This turns off the feature that
automatically generates string and <code>.FILL</code> directives,
so now each uncategorized byte is on its own line.</p>
</div>
</div>
<div class="grid-container">
<div class="grid-item-image">
<img src="images/t2-1000-fmt-word.png" alt="t2-1000-fmt-word"/>
</div>
<div class="grid-item-text">
<p>You could select the first two lines and use
<samp>Actions &gt; Edit Operand</samp> to format them as a 16-bit
little-endian hex value, but there's a shortcut: select the first
line with data (address $1000), then <samp>Actions &gt; Format As Word</samp>
(<kbd class="key">Ctrl+W</kbd>).
It automatically grabbed the following byte and combined them.</p>
</div>
</div>
<div class="grid-container">
<div class="grid-item-image">
<img src="images/t2-1000-setcode.png" alt="t2-1000-setcode"/>
</div>
<div class="grid-item-text">
<p>Since we believe $2000 is the load address for everything that follows,
click on the line with address $1002, select
<samp>Actions &gt; Set Address</samp>, and enter "2000". With that line
still selected, use <samp>Actions &gt; Tag Address As Code Start Point</samp>
(<kbd class="key">Ctrl+H</kbd> <kbd class="key">Ctrl+C</kbd>) to
tell the analyzer to start looking for code there.</p>
</div>
</div>
<div class="grid-container">
<div class="grid-item-image">
<img src="images/t2-1000-ready.png" alt="t2-1000-ready"/>
</div>
<div class="grid-item-text">
<p>That looks better, but the branch destination ($203D) is off the bottom of the
screen (unless you have a really tall screen or small fonts) because of
all the intervening data. Use <samp>Edit &gt; Toggle Data Scan</samp>
(<kbd class="key">Ctrl+D</kbd>)
to turn the string-finder back on. Now it's easier to read.</p>
</div>
</div>
</div> <!-- #main -->
<div id="prevnext">
<a href="generating-code.html" class="btn-previous">&laquo; Previous</a>
<a href="string-formatting.html" class="btn-next">Next &raquo;</a>
</div>
<div id="footer">
<!-- START: /footer-incl.html -->
Add ${ROOT} substitution Doesn't really affect the pages on the web, but it's easier to preview them in the filesystem when linked to "../main.css" rather than "/main.css". The common portion of the <head> section is now in a separate "include" file. Added some indentation to masthead/topnav/sidenav so it looks nicer in the merged source listing.
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<hr/>
<p>Copyright 2021 faddenSoft</p>
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Execute scripts This change applies the substitution scripts on the HTML files, replacing away the jQuery load() calls with the actual file contents, and setting the correct URLs to the prev/next buttons.
2021-06-08 00:14:16 +00:00
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</div>
</body>
</html>
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