DS game only ov031 general_2d_ui
containers: 2d/charmake/scr_top.lzs, 2d/charmake/scr_under_%d.lzs, scr_top
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 31 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 + 31 * 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_031.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/ov031.json;
the per-overlay descriptive markdown is at
notes/overlay_knowledgebase/ov031.md.
Embedded strings
2 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.
-
scr_topβdata/2d/charmake/scr_top.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/charmake/scr_top.lzsβ no matching container found in clean extract -
2d/charmake/scr_under_%d.lzsβ 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 38 functions
| # | Address | Size | Calls | Strings | Role hint |
|---|---|---|---|---|---|
| 1 | 0x02155b60 | 6 | 0 | 0 | trampoline / small helper |
| 2 | 0x02155b68 | 48 | 4 | 0 | code |
| 3 | 0x02155b9c | 28 | 3 | 0 | trampoline / small helper |
| 4 | 0x02155bb8 | 272 | 14 | 0 | code |
| 5 | 0x02155ce4 | 184 | 11 | 0 | code |
| 6 | 0x02155dac | 66 | 3 | 0 | code |
| 7 | 0x02155df0 | 72 | 4 | 0 | code |
| 8 | 0x02155e3c | 180 | 8 | 3 | refs: 2d/charmake/scr_top.lzs \| 2d/charmake/scr_under_%d.lzs \| scr_under_%d |
| 9 | 0x02155f04 | 38 | 5 | 0 | trampoline / small helper |
| 10 | 0x02155f2c | 38 | 5 | 0 | trampoline / small helper |
| 11 | 0x02155f54 | 68 | 4 | 1 | refs: scr_top |
| 12 | 0x02155f9c | 30 | 3 | 0 | trampoline / small helper |
| 13 | 0x02155fbc | 76 | 5 | 0 | code |
| 14 | 0x02156008 | 40 | 4 | 0 | code |
| 15 | 0x02156030 | 192 | 6 | 1 | refs: scr_top |
| 16 | 0x021560fc | 28 | 1 | 0 | trampoline / small helper |
| 17 | 0x02156118 | 384 | 11 | 0 | code |
| 18 | 0x021562ac | 34 | 1 | 0 | trampoline / small helper |
| 19 | 0x021562d0 | 80 | 6 | 0 | code |
| 20 | 0x02156324 | 368 | 12 | 0 | code |
| 21 | 0x021564b8 | 70 | 4 | 0 | code |
| 22 | 0x02156504 | 30 | 3 | 0 | trampoline / small helper |
| 23 | 0x02156528 | 26 | 2 | 0 | trampoline / small helper |
| 24 | 0x02156548 | 26 | 2 | 0 | trampoline / small helper |
| 25 | 0x02156568 | 128 | 7 | 0 | code |
| 26 | 0x021565f0 | 204 | 2 | 0 | code |
| 27 | 0x021566cc | 56 | 1 | 0 | code |
| 28 | 0x02156708 | 22 | 1 | 0 | trampoline / small helper |
| 29 | 0x02156724 | 238 | 9 | 0 | code |
| 30 | 0x02156818 | 958 | 26 | 0 | high-fan-out (likely dispatcher / setup) |
| 31 | 0x02156bf4 | 44 | 1 | 0 | code |
| 32 | 0x02156c24 | 394 | 16 | 0 | code |
| 33 | 0x02156ddc | 6 | 0 | 0 | trampoline / small helper |
| 34 | 0x02156de4 | 6 | 0 | 0 | trampoline / small helper |
| 35 | 0x02156dec | 172 | 9 | 0 | code |
| 36 | 0x02156ea8 | 30 | 1 | 0 | trampoline / small helper |
| 37 | 0x02156ecc | 314 | 7 | 0 | code |
| 38 | 0x02157028 | 12 | 1 | 0 | trampoline / small helper |
Open questions & conflicts
Open questions / unknowns
- Auto-analysis identified 38 functions covering 4968 of 6112 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` = `['charmake']`; Ghidra-extracted containers = `['2d/charmake/scr_top.lzs', '2d/charmake/scr_under_%d.lzs', 'scr_top']`. Ghidra wins.
Source
- Per-overlay markdown:
notes/overlay_knowledgebase/ov031.md - Raw Ghidra dump:
notes/overlay_knowledgebase/raw/ov031.json - Overlay-system explainer: overlays system
- Plain-English overlay primer: overlay knowledgebase