mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-05-19 22:38:05 +02:00
Kevin Thomas
101 lines
4.5 KiB
XML
101 lines
4.5 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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<!-- Title -->
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<text x="600" y="52" text-anchor="middle" class="title">Program Counter Flow</text>
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<text x="600" y="88" text-anchor="middle" class="dim">Instruction Execution</text>
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<!-- Left Panel: PC stepping through instructions -->
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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">PC Execution</text>
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<line x1="50" y1="163" x2="550" y2="163" stroke="#1a1a2e"/>
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<!-- Instruction list -->
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<text x="55" y="205" class="dim">ADDR</text>
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<text x="220" y="205" class="dim">INSTRUCTION</text>
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<!-- Line 1 -->
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<rect x="55" y="220" width="490" height="45" rx="4" fill="#0f1a0f" stroke="#00ff41" stroke-width="2"/>
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<text x="70" y="250" class="amb">0x1000</text>
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<text x="230" y="250" class="grn">MOV r0, #5</text>
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<text x="490" y="250" text-anchor="end" class="red">PC</text>
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<!-- Line 2 -->
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<rect x="55" y="275" width="490" height="45" rx="4" fill="#0a0a0f" stroke="#1a1a2e"/>
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<text x="70" y="305" class="amb">0x1002</text>
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<text x="230" y="305" class="txt">MOV r1, #3</text>
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<!-- Line 3 -->
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<rect x="55" y="330" width="490" height="45" rx="4" fill="#0a0a0f" stroke="#1a1a2e"/>
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<text x="70" y="360" class="amb">0x1004</text>
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<text x="230" y="360" class="txt">ADD r0, r1</text>
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<!-- Line 4 -->
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<rect x="55" y="385" width="490" height="45" rx="4" fill="#0a0a0f" stroke="#1a1a2e"/>
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<text x="70" y="415" class="amb">0x1006</text>
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<text x="230" y="415" class="txt">BL func</text>
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<!-- Line 5: branch target -->
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<rect x="55" y="440" width="490" height="45" rx="4" fill="#0a0a0f" stroke="#1a1a2e"/>
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<text x="70" y="470" class="amb">0x1010</text>
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<text x="230" y="470" class="txt">func: PUSH {lr}</text>
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<!-- Line 6 -->
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<rect x="55" y="495" width="490" height="45" rx="4" fill="#0a0a0f" stroke="#1a1a2e"/>
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<text x="70" y="525" class="amb">0x1012</text>
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<text x="230" y="525" class="txt">SUB r0, #1</text>
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<!-- Line 7 -->
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<rect x="55" y="550" width="490" height="45" rx="4" fill="#0a0a0f" stroke="#1a1a2e"/>
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<text x="70" y="580" class="amb">0x1014</text>
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<text x="230" y="580" class="txt">POP {pc}</text>
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<!-- Arrow showing jump -->
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<line x1="520" y1="407" x2="520" y2="462" stroke="#ff0040" stroke-width="2" stroke-dasharray="6"/>
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<polygon points="510,462 520,480 530,462" fill="#ff0040"/>
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<text x="340" y="640" text-anchor="middle" class="dim">BL = jump to function target</text>
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<text x="340" y="670" text-anchor="middle" class="dim">POP {pc} = return to caller</text>
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<!-- Right Panel: Key Concepts -->
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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">Key Concepts</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="cyn">r15 = PC</text>
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<text x="625" y="240" class="txt">Points to current</text>
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<text x="625" y="272" class="txt">instruction + 4</text>
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<text x="625" y="304" class="dim">Prefetch pipeline</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="grn">Sequential</text>
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<text x="625" y="407" class="txt">Thumb next = +2 or +4</text>
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<text x="625" y="439" class="dim">depends on instruction encoding</text>
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<text x="625" y="471" class="dim">Cortex-M33 executes Thumb only</text>
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<line x1="620" y1="499" x2="1150" y2="499" stroke="#1a1a2e"/>
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<text x="625" y="539" class="red">Branch</text>
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<text x="625" y="574" class="txt">B = unconditional</text>
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<text x="625" y="606" class="txt">BL = save LR, jump</text>
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<text x="625" y="638" class="txt">BX = branch reg</text>
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<text x="625" y="670" class="txt">BEQ = branch if Z=1</text>
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<text x="900" y="606" class="dim">not linear +2 stepping</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="amb">GDB tip</text>
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<text x="625" y="770" class="dim">stepi = step 1 instr</text>
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</svg> |
