mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-07-06 20:47:55 +02:00
Kevin Thomas
71 lines
3.5 KiB
XML
71 lines
3.5 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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<rect class="hdr" x="0" y="0" width="1200" height="100" rx="0"/>
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<text class="title" x="600" y="52" text-anchor="middle">Instruction Encoding</text>
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<text class="dim" x="600" y="88" text-anchor="middle">movs (16-bit Thumb) vs movw (32-bit Thumb-2)</text>
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<!-- Top Left: movs encoding -->
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<rect class="pnl" x="30" y="110" width="555" height="310" rx="8"/>
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<text class="sub" x="50" y="145">movs r1, #42 (FAV_NUM)</text>
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<text class="dim" x="50" y="175">At address 0x1000028E</text>
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<rect x="50" y="195" width="515" height="55" rx="6" fill="#0a0a0f" stroke="#00ff41" stroke-width="1"/>
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<text class="grn" x="70" y="228">Bytes: 2A 21</text>
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<text class="dim" x="50" y="270">2A = immediate value (42)</text>
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<text class="dim" x="50" y="295">21 = opcode (movs r1)</text>
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<text class="amb" x="50" y="325">16-bit Thumb instruction</text>
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<text class="dim" x="50" y="355">Fits values 0-255 in 8 bits</text>
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<text class="dim" x="50" y="380">File offset: 0x28E</text>
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<!-- Top Right: movw encoding -->
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<rect class="pnl" x="615" y="110" width="555" height="310" rx="8"/>
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<text class="sub" x="635" y="145">movw r1, #1337 (OTHER_FAV)</text>
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<text class="dim" x="635" y="175">At address 0x10000296</text>
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<rect x="635" y="195" width="515" height="55" rx="6" fill="#0a0a0f" stroke="#00d4ff" stroke-width="1"/>
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<text class="cyn" x="655" y="228">Bytes: 40 F2 39 51</text>
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<text class="dim" x="635" y="270">40 F2 = opcode (first halfword)</text>
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<text class="dim" x="635" y="295">39 = imm8 (lower 8 bits)</text>
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<text class="dim" x="635" y="320">51 = dest reg + upper imm</text>
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<text class="amb" x="635" y="350">32-bit Thumb-2 instruction</text>
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<text class="dim" x="635" y="380">File offset: 0x296</text>
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<!-- Bottom: Byte Layout Diagram -->
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<rect class="pnl" x="30" y="435" width="1140" height="170" rx="8"/>
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<text class="sub" x="50" y="470">movw Byte Layout (40 F2 39 51)</text>
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<rect x="50" y="485" width="260" height="50" rx="4" fill="#12121a" stroke="#ffaa00"/>
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<text class="amb" x="90" y="516">40 F2</text>
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<text class="dim" x="50" y="555">Opcode + upper imm</text>
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<rect x="330" y="485" width="260" height="50" rx="4" fill="#12121a" stroke="#00ff41"/>
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<text class="grn" x="400" y="516">39</text>
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<text class="dim" x="330" y="555">imm8 (lower 8 bits)</text>
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<rect x="610" y="485" width="260" height="50" rx="4" fill="#12121a" stroke="#00d4ff"/>
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<text class="cyn" x="690" y="516">51</text>
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<text class="dim" x="610" y="555">Dest reg (r1) + bits</text>
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<text class="dim" x="900" y="516">imm16 = 0x539</text>
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<text class="dim" x="900" y="555">= 1337 decimal</text>
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<!-- Bottom: Why movw -->
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<rect class="pnl" x="30" y="620" width="1140" height="130" rx="8"/>
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<text class="red" x="50" y="655">Why movw instead of movs?</text>
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<text class="txt" x="50" y="690">1337 > 255 -- does not fit in 8-bit movs immediate</text>
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<text class="dim" x="50" y="725">movw encodes 0-65535 in 32-bit instruction</text>
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</svg> |
