mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-05-19 14:28:06 +02:00
Kevin Thomas
83 lines
3.6 KiB
XML
83 lines
3.6 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">Writing to SRAM</text>
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<text x="600" y="88" text-anchor="middle" class="dim">Memory Manipulation</text>
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<!-- Left Panel: Memory View -->
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<rect x="30" y="105" width="540" height="675" class="pnl" rx="8"/>
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<text x="300" y="148" text-anchor="middle" class="sub">SRAM at 0x20040000</text>
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<line x1="50" y1="163" x2="550" y2="163" stroke="#1a1a2e"/>
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<!-- Before -->
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<text x="55" y="205" class="red">Before (empty)</text>
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<rect x="55" y="225" width="490" height="42" rx="4" fill="#0a0a0f" stroke="#1a1a2e"/>
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<text x="70" y="253" class="dim">00 00 00 00 00 00 00 00</text>
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<rect x="55" y="277" width="490" height="42" rx="4" fill="#0a0a0f" stroke="#1a1a2e"/>
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<text x="70" y="305" class="dim">00 00 00 00 00 00 00 00</text>
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<!-- After -->
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<text x="55" y="370" class="grn">After writing</text>
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<rect x="55" y="390" width="490" height="42" rx="4" fill="#0f1a0f" stroke="#00ff41" stroke-width="2"/>
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<text x="70" y="418" class="grn">68 61 63 6b 79 2c 20 77</text>
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<text x="55" y="470" class="dim">h a c k y , w</text>
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<!-- The GDB command -->
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<text x="55" y="530" class="amb">GDB Command:</text>
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<rect x="55" y="548" width="490" height="90" rx="5" fill="#0a0a0f" stroke="#ffaa00" stroke-width="2"/>
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<text x="70" y="580" class="txt">set {char[13]}</text>
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<text x="70" y="612" class="txt">0x20040000 = "hacky, world"</text>
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<!-- Verify -->
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<text x="55" y="680" class="cyn">Verify with:</text>
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<rect x="55" y="698" width="490" height="42" rx="5" fill="#0a0a0f" stroke="#1a1a2e"/>
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<text x="70" y="726" class="txt">x/s 0x20040000</text>
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<!-- Right Panel: Why SRAM -->
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<rect x="600" y="105" width="570" height="675" class="pnl" rx="8"/>
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<text x="885" y="148" text-anchor="middle" class="sub">Why SRAM?</text>
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<line x1="620" y1="163" x2="1150" y2="163" stroke="#1a1a2e"/>
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<text x="625" y="205" class="grn">SRAM = writable</text>
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<text x="625" y="240" class="txt">RAM at 0x20000000</text>
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<text x="625" y="272" class="txt">We can write any</text>
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<text x="625" y="304" class="txt">data here via GDB</text>
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<line x1="620" y1="332" x2="1150" y2="332" stroke="#1a1a2e"/>
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<text x="625" y="372" class="red">Flash = read-only</text>
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<text x="625" y="407" class="txt">XIP at 0x10000000</text>
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<text x="625" y="439" class="txt">Cannot write to it</text>
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<text x="625" y="471" class="txt">during execution</text>
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<text x="625" y="503" class="dim">That's why we use RAM</text>
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<line x1="620" y1="531" x2="1150" y2="531" stroke="#1a1a2e"/>
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<text x="625" y="571" class="amb">Choosing Address</text>
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<text x="625" y="606" class="txt">0x20040000 is safe</text>
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<text x="625" y="638" class="txt">Far from stack</text>
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<text x="625" y="670" class="txt">and heap regions</text>
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<line x1="620" y1="698" x2="1150" y2="698" stroke="#1a1a2e"/>
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<text x="625" y="738" class="cyn">Null terminator</text>
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<text x="625" y="773" class="dim">\0 ends the string</text>
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</svg> |
