ov083 — overlay detail

Header

Numeric metadata for this overlay as read from the overlay table at ROM offset 0x8DE00 (per-entry stride 32 bytes). Function counts, data-item counts, and the call-graph fan-out are from a Ghidra 11.3.1 headless auto-analysis pass.

Reading the binary

The overlay ships on the cart at file ID 83 under the BLZ code-LZ compression wrapper (the same backward-LZ scheme Nintendo uses for executable ARM9 code). At load time the engine reads the overlay table entry at ROM offset 0x8DE00 + 83 * 0x20, allocates the destination RAM region at 0x021597a0, decompresses the body in-place (if compressed), and resolves any external relocations.

To inspect this overlay outside the running game, decompress overlay/overlay_083.bin with ndspy.codeCompression.decompress() (Python ndspy library) and load the resulting plaintext into Ghidra or IDA at base address 0x021597a0. The raw Ghidra auto-analysis dump used to populate this page lives at notes/overlay_knowledgebase/raw/ov083.json; the per-overlay descriptive markdown is at notes/overlay_knowledgebase/ov083.md.

Embedded strings

No UTF-16 LE strings are embedded directly in this overlay's binary. Any text it displays at runtime comes from a container file loaded via the content cache.

Container references

Distinct container basenames referenced by this overlay. Each is loaded via the content cache by passing the basename string to a lookup that resolves it to a file ID in the ROM's FAT. The path column shows the file's location in the clean extract, where resolved.

• magic → data/2d/status/magic.lzs
• mgc80 → data/2d/inputmagic/mgc80.ofs
• mgcall → data/2d/inputmagic/mgcall.ofs
• order → data/2d/inputmagic/order.ofs

Unresolved

These container basenames appeared in the overlay's string table but no file of that name was found in the clean extract. Most are false-positive ASCII matches (function names, register maps, fragments of other strings); a few may be containers that the overlay names but never actually opens. Listed for completeness.

• 2d/inputmagic/mgc80.ofs — no matching container found in clean extract
• 2d/inputmagic/mgcall.ofs — no matching container found in clean extract
• 2d/inputmagic/order.ofs — no matching container found in clean extract
• 2d/status/magic.lzs — no matching container found in clean extract

Function list

Functions Ghidra auto-identified inside this overlay's RAM range. Names prefixed FUN_ are auto-generated from the function's entry address; size is in bytes; the "calls" column counts both intra-overlay branches and external ARM9 call targets. The "strings" column counts how many UTF-16 LE strings each function references.

Open questions & conflicts

Open questions / unknowns

• Auto-analysis identified 30 functions covering 2490 of 4320 overlay bytes.
• Function names are auto-generated `FUN_<addr>`. Manual renaming based on call-graph + string-ref analysis is a follow-up.
• BSS size is 0 bytes; Ghidra-imported overlay does not include BSS so any references into the BSS range appear as unresolved.

Conflicts with the prior shallow pass

• **Mismatch:** prior-pass `controls_containers` = `['inputmagic', 'status']`; Ghidra-extracted containers = `['2d/inputmagic/mgc80.ofs', '2d/inputmagic/mgcall.ofs', '2d/inputmagic/order.ofs', '2d/status/magic.lzs', 'magic', 'mgc80', 'mgcall', 'order']`. Ghidra wins.

Source

• Per-overlay markdown: notes/overlay_knowledgebase/ov083.md
• Raw Ghidra dump: notes/overlay_knowledgebase/raw/ov083.json
• Overlay-system explainer: overlays system
• Plain-English overlay primer: overlay knowledgebase