mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-07-06 12:37:54 +02:00
Kevin Thomas
93 lines
4.2 KiB
XML
93 lines
4.2 KiB
XML
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 800">
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<style>
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.bg{fill:#0a0a0f}.pnl{fill:#12121a;stroke:#1a1a2e}.hdr{fill:#12121a}
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.title{font:bold 42px 'Courier New',monospace;fill:#00ff41}
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.sub{font:bold 28px 'Courier New',monospace;fill:#00d4ff}
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.txt{font:24px 'Courier New',monospace;fill:#c0c0c0}
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.dim{font:20px 'Courier New',monospace;fill:#888}
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.grn{font:bold 24px 'Courier New',monospace;fill:#00ff41}
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.red{font:bold 24px 'Courier New',monospace;fill:#ff0040}
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.cyn{font:bold 24px 'Courier New',monospace;fill:#00d4ff}
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.amb{font:bold 24px 'Courier New',monospace;fill:#ffaa00}
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.badge{stroke:#00ff41;rx:14}
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</style>
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<rect class="bg" width="1200" height="800"/>
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<!-- Title -->
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<text x="600" y="52" text-anchor="middle" class="title">Memory Layout</text>
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<text x="600" y="88" text-anchor="middle" class="dim">Where variables live in RAM</text>
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<!-- Memory Diagram -->
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<rect x="40" y="110" width="540" height="670" rx="8" class="pnl"/>
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<text x="310" y="148" text-anchor="middle" class="sub">RP2350 SRAM Map</text>
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<!-- Stack -->
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<rect x="60" y="170" width="380" height="90" rx="4" fill="#ff0040" stroke="#ff0040" stroke-width="1" opacity="0.15"/>
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<text x="250" y="205" text-anchor="middle" class="red">STACK (grows down)</text>
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<text x="250" y="235" text-anchor="middle" class="dim">Local/auto variables</text>
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<text x="455" y="210" class="dim">0x20082000</text>
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<!-- Free Space -->
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<rect x="60" y="270" width="380" height="100" rx="4" fill="#1a1a2e" stroke="#1a1a2e" stroke-width="1"/>
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<text x="250" y="325" text-anchor="middle" class="dim">(free space)</text>
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<!-- Heap -->
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<rect x="60" y="380" width="380" height="90" rx="4" fill="#ffaa00" stroke="#ffaa00" stroke-width="1" opacity="0.15"/>
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<text x="250" y="415" text-anchor="middle" class="amb">HEAP (grows up)</text>
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<text x="250" y="445" text-anchor="middle" class="dim">malloc / free</text>
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<!-- .bss -->
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<rect x="60" y="480" width="380" height="90" rx="4" fill="#00d4ff" stroke="#00d4ff" stroke-width="1" opacity="0.15"/>
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<text x="250" y="515" text-anchor="middle" class="cyn">.bss section</text>
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<text x="250" y="545" text-anchor="middle" class="dim">Uninit static/global</text>
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<!-- .data -->
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<rect x="60" y="580" width="380" height="90" rx="4" fill="#00ff41" stroke="#00ff41" stroke-width="1" opacity="0.15"/>
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<text x="250" y="615" text-anchor="middle" class="grn">.data section</text>
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<text x="250" y="645" text-anchor="middle" class="dim">Initialized static/global</text>
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<text x="455" y="650" class="dim">0x20000000</text>
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<text x="60" y="730" class="dim">Static vars: .data (init)</text>
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<text x="60" y="755" class="dim">Static vars: .bss (uninit)</text>
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<!-- Variable Types Table -->
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<rect x="620" y="110" width="540" height="390" rx="8" class="pnl"/>
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<text x="890" y="148" text-anchor="middle" class="sub">Variable Storage</text>
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<text x="640" y="188" class="cyn">Type</text>
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<text x="880" y="188" class="cyn">Location</text>
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<line x1="640" y1="198" x2="1140" y2="198" stroke="#1a1a2e" stroke-width="1"/>
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<text x="640" y="228" class="txt">Automatic</text>
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<text x="880" y="228" class="red">Stack</text>
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<text x="640" y="258" class="txt">Static</text>
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<text x="880" y="258" class="grn">.data / .bss</text>
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<text x="640" y="288" class="txt">Global</text>
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<text x="880" y="288" class="grn">.data / .bss</text>
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<text x="640" y="318" class="txt">Dynamic</text>
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<text x="880" y="318" class="amb">Heap</text>
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<text x="640" y="358" class="dim">Static vars are NOT on heap!</text>
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<text x="640" y="383" class="dim">Fixed location, set at compile</text>
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<text x="640" y="408" class="dim">time. Lives entire program.</text>
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<text x="640" y="448" class="grn">Example:</text>
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<text x="640" y="473" class="dim">static_fav_num @ 0x200005A8</text>
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<!-- Key Insight -->
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<rect x="620" y="520" width="540" height="260" rx="8" class="pnl"/>
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<text x="890" y="548" text-anchor="middle" class="sub">Key Insight</text>
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<text x="640" y="588" class="txt">Stack vars:</text>
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<text x="640" y="618" class="red">Created + destroyed</text>
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<text x="640" y="648" class="dim">each function call</text>
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<text x="640" y="693" class="txt">Static vars:</text>
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<text x="640" y="723" class="grn">Fixed RAM address</text>
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<text x="640" y="753" class="dim">persist entire runtime</text>
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</svg> |
