58 lines
2.0 KiB
Markdown
58 lines
2.0 KiB
Markdown
# H8/536 ROM Decompiler
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This repo now includes a standalone Python helper for the H8/536 ROM image:
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```powershell
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python h8536_decompiler.py ROM\M27C512@DIP28_1.BIN --out build\rom_decompiled.asm --json build\rom_decompiled.json
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```
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On this machine the Windows `python.exe` entry is a Microsoft Store launcher stub, so validation was run with WSL:
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```powershell
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ubuntu.exe run python3 h8536_decompiler.py --out build/rom_decompiled.asm --json build/rom_decompiled.json
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```
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## What It Does
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- Decodes the H8/500 instruction set used by the H8/536.
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- Reads the H8/536 minimum-mode vector table from the ROM.
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- Recursively traces reachable code from reset, interrupt, and trap vectors.
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- Emits labels for branch and call targets.
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- Annotates H8/536 on-chip register accesses such as `P1DDR`, `SYSCR1`, `WCR`, and timer/SCI/A-D registers.
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- Handles the E-clock transfer instructions `MOVFPE` and `MOVTPE`.
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The generated listing is written to:
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```text
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build/rom_decompiled.asm
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```
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The optional JSON output is useful for scripts or later analysis:
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```text
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build/rom_decompiled.json
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```
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## Useful Options
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```powershell
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python h8536_decompiler.py --help
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```
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- `--mode min|max`: vector format. This ROM appears to be minimum mode; `min` is the default.
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- `--entry H'1234`: add an extra entry point to recursive tracing.
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- `--linear`: linear-sweep the selected range instead of tracing from vectors.
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- `--start H'1000 --end H'D100`: constrain the decode range.
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- `--br H'FE`: resolve short absolute `@aa:8` operands through a known base-register value.
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## Code Layout
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- `h8536_decompiler.py`: compatibility wrapper for the CLI.
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- `h8536/cli.py`: argument parsing and end-to-end orchestration.
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- `h8536/decoder.py`: instruction and effective-address decoding.
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- `h8536/tables.py`: manual-derived opcode/vector/register tables.
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- `h8536/vectors.py`: exception vector parsing.
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- `h8536/analysis.py`: recursive tracing, linear sweep, and labels.
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- `h8536/render.py`: assembly and JSON output.
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- `h8536/model.py`, `h8536/rom.py`, `h8536/formatting.py`: shared data structures and helpers.
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