mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-05-20 23:04:55 +02:00
Kevin Thomas
79 lines
3.7 KiB
XML
79 lines
3.7 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">LDR Instruction</text>
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<text x="600" y="88" text-anchor="middle" class="dim">ARM Load Instructions</text>
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<!-- Left Panel: LDR Flow -->
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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">How LDR Works</text>
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<line x1="50" y1="163" x2="550" y2="163" stroke="#1a1a2e"/>
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<!-- The instruction -->
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<text x="55" y="205" class="dim">Instruction:</text>
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<rect x="55" y="220" width="490" height="50" rx="5" fill="#0f1a0f" stroke="#00ff41" stroke-width="2"/>
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<text x="300" y="252" text-anchor="middle" class="grn">LDR r0, [pc, #12]</text>
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<!-- Step 1 -->
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<text x="55" y="315" class="amb">Step 1: Calculate addr</text>
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<rect x="55" y="335" width="490" height="50" rx="5" fill="#0a0a0f" stroke="#1a1a2e"/>
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<text x="300" y="367" text-anchor="middle" class="txt">addr = PC + 12</text>
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<!-- Step 2 -->
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<text x="55" y="430" class="amb">Step 2: Read memory</text>
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<rect x="55" y="450" width="490" height="50" rx="5" fill="#0a0a0f" stroke="#1a1a2e"/>
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<text x="300" y="482" text-anchor="middle" class="txt">value = *(addr)</text>
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<!-- Step 3 -->
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<text x="55" y="545" class="amb">Step 3: Load into reg</text>
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<rect x="55" y="565" width="490" height="50" rx="5" fill="#0f0f1a" stroke="#00d4ff" stroke-width="2"/>
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<text x="300" y="597" text-anchor="middle" class="cyn">r0 = value</text>
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<!-- Result -->
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<text x="300" y="670" text-anchor="middle" class="txt">r0 now holds the</text>
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<text x="300" y="702" text-anchor="middle" class="txt">address of our</text>
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<text x="300" y="734" text-anchor="middle" class="grn">"hello, world" string</text>
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<!-- Right Panel: Why It Matters -->
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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 It Matters</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">String Loading</text>
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<text x="625" y="240" class="txt">printf needs addr</text>
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<text x="625" y="272" class="txt">of string in r0</text>
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<text x="625" y="304" class="dim">r0 = first argument</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="cyn">PC-Relative</text>
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<text x="625" y="407" class="txt">Address computed</text>
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<text x="625" y="439" class="txt">relative to current</text>
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<text x="625" y="471" class="txt">PC position</text>
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<text x="625" y="503" class="dim">Works from any addr</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="red">The Attack Point</text>
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<text x="625" y="606" class="txt">If we change r0</text>
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<text x="625" y="638" class="txt">AFTER the LDR</text>
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<text x="625" y="670" class="txt">printf prints OUR</text>
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<text x="625" y="702" class="txt">string instead!</text>
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<line x1="620" y1="730" x2="1150" y2="730" stroke="#1a1a2e"/>
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<text x="625" y="765" class="amb">This is the hack!</text>
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</svg> |
