DS game only ov047 general_2d_ui
containers: 2d/selmusicshow.lzs, selectmusic, selmusicshow
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 47 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 + 47 * 0x20, allocates the destination
RAM region at 0x02155a00, decompresses
the body in-place (if compressed), and resolves any external
relocations.
To inspect this overlay outside the running game, decompress
overlay/overlay_047.bin with
ndspy.codeCompression.decompress() (Python ndspy library)
and load the resulting plaintext into Ghidra or
IDA at base address 0x02155a00. The
raw Ghidra auto-analysis dump used to populate this page lives at
notes/overlay_knowledgebase/raw/ov047.json;
the per-overlay descriptive markdown is at
notes/overlay_knowledgebase/ov047.md.
Embedded strings
4 UTF-16 LE strings live inside this overlay's compiled binary. These addresses are absolute (inside the overlay's RAM image after load). The text is stored as little-endian UTF-16 code units, NUL-terminated.
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.
-
selectmusicโdata/selectmusic.lzs -
selmusicshowโdata/2d/selmusicshow.lzs
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/selmusicshow.lzsโ 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.
Show all 31 functions
| # | Address | Size | Calls | Strings | Role hint |
|---|---|---|---|---|---|
| 1 | 0x02155a00 | 176 | 2 | 0 | code |
| 2 | 0x02155ab0 | 88 | 12 | 0 | code |
| 3 | 0x02155f8c | 36 | 4 | 0 | trampoline / small helper |
| 4 | 0x02155fb0 | 574 | 32 | 0 | high-fan-out (likely dispatcher / setup) |
| 5 | 0x021561f8 | 358 | 24 | 0 | high-fan-out (likely dispatcher / setup) |
| 6 | 0x02156374 | 12 | 0 | 0 | trampoline / small helper |
| 7 | 0x02156388 | 44 | 0 | 0 | code |
| 8 | 0x021563b8 | 58 | 2 | 0 | code |
| 9 | 0x021563f4 | 56 | 1 | 0 | code |
| 10 | 0x02156430 | 22 | 1 | 0 | trampoline / small helper |
| 11 | 0x0215644c | 98 | 5 | 0 | code |
| 12 | 0x021564c0 | 40 | 5 | 0 | code |
| 13 | 0x021564ec | 28 | 1 | 0 | trampoline / small helper |
| 14 | 0x0215650c | 28 | 1 | 0 | trampoline / small helper |
| 15 | 0x0215652c | 28 | 1 | 0 | trampoline / small helper |
| 16 | 0x0215654c | 10 | 0 | 0 | trampoline / small helper |
| 17 | 0x02156560 | 312 | 11 | 0 | code |
| 18 | 0x0215669c | 50 | 2 | 0 | code |
| 19 | 0x021566d4 | 68 | 3 | 0 | code |
| 20 | 0x0215671c | 206 | 12 | 0 | code |
| 21 | 0x021567f4 | 428 | 10 | 0 | code |
| 22 | 0x021569a0 | 434 | 24 | 0 | high-fan-out (likely dispatcher / setup) |
| 23 | 0x02156b70 | 458 | 19 | 0 | code |
| 24 | 0x02156d58 | 1,048 | 43 | 14 | refs: selmusicshow \| selmusicshow \| selmusicshow \| selmusicshow \| selmusicshow \| selmusicshow |
| 25 | 0x021571b4 | 106 | 9 | 0 | code |
| 26 | 0x02157224 | 386 | 19 | 0 | code |
| 27 | 0x021573ac | 160 | 9 | 0 | code |
| 28 | 0x02157454 | 194 | 13 | 0 | code |
| 29 | 0x02157524 | 168 | 10 | 0 | code |
| 30 | 0x021575dc | 16 | 1 | 0 | trampoline / small helper |
| 31 | 0x021575f0 | 22 | 2 | 0 | trampoline / small helper |
Open questions & conflicts
Open questions / unknowns
- Auto-analysis identified 31 functions covering 5712 of 7520 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
- Partial overlap: prior-pass had `['selmusicshow']`; Ghidra adds `['2d/selmusicshow.lzs', 'selectmusic']`.
Source
- Per-overlay markdown:
notes/overlay_knowledgebase/ov047.md - Raw Ghidra dump:
notes/overlay_knowledgebase/raw/ov047.json - Overlay-system explainer: overlays system
- Plain-English overlay primer: overlay knowledgebase