PPSA28416 calls it on its existing save at boot (after sceSaveDataDirNameSearch finds it) and aborted on the missing implementation. The call takes one parameter block: user id at +0, the directory name pointer at +8. Host saves have no size limit, so the conversion completes at once: an existing save returns OK, a missing one NOT_FOUND, an invalid name PARAMETER. The title polls sceSaveDataGetEventResult once afterwards and continues on 'no event'.
The search returned saves in host directory order and ignored the condition's key and order. A title that asks for the newest save first (modification time, descending) got whichever directory the host listed first: the alphabetically first on NTFS, an arbitrary one on Linux. Sort by directory name, user parameter or modification time, reverse for a descending order, and reject unknown keys and orders with the parameter error, as shadPS4 does.
Palworld (PPSA23126) imports sceSaveDataCancel (e6y3WMBYbiM) from
libSceSaveData and fails to load because no library exports it. Its
signature is unknown, so it is exported without an implementation and
throws if it is called, like sceSaveDataConvert.
sceSaveDataMount3 with SCE_SAVE_DATA_MOUNT_MODE_CREATE2 opens a save that
already exists, so its mount status is 0 rather than CREATED, as shadPS4's
savedata.cpp reports. A CREATE mount still reports CREATED.
PPSA16064 (Minecraft Dungeons II, Unreal Engine) failed to load because
these imports had no export:
- libkernel: sceCoredumpWriteUserString
- libSceSaveData: sceSaveDataConvert, sceSaveDataGetConvertProgress
- libSceVideoOut: sceVideoOutVrrPegToFixedRate,
sceVideoOutVrrUnpegFromFixedRate
None of them is called during the title's start-up, so they are added
as unimplemented exports that throw with their name if a title calls
them. Their signatures are unknown; TechnicalDebt records them. The
built libraries export the NIDs the title imports.
Mount, unmount, param, icon and mount-info calls read and wrote the
global mount slot table without a lock, so two threads mounting at
once could take the same slot and one would later fail to unmount its
own mount point. Guard the table with a mutex and make the initialization
count atomic.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MBXJqzgohLeVAeHsn4Jpm7
A second sceSaveDataInitialize3 returned SAVE_DATA_ERROR_ALREADY_INITIALIZED.
PPSA12544's executable and its Unity SaveData plugin both initialize, and
the plugin raises Unity.SaveData.PS5.Core.SaveDataException on any error,
so the console must accept the second call. Initializations are now
counted; sceSaveDataTerminate ends the session at the last one and only
then checks for mounted slots.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Rename the two unknown libSceSaveData.native stubs to
sceSaveDataTransferringMountPs4 (RjMlsR8EXrw) and
sceSaveDataDirNameSearchPs4 (X4MYzukPc3g). There is no PS4 save area:
the mount returns NOT_FOUND like sceSaveDataTransferringMount, and the
search reports zero hits.
Co-Authored-By: Claude <noreply@anthropic.com>
sceSaveDataDelete appended the title's directory name to the save root
without any check and passed the result to std::filesystem::remove_all.
"../victim" removed a directory beside the save root, ".." the directory
holding the save root, and an empty name or "." every save. The name
now has to be terminated within its field, non-empty, not "." or "..",
and free of "/", "\" and ":", as sceSaveDataMount3 already requires;
otherwise the call returns SAVE_DATA_ERROR_PARAMETER and deletes nothing.
The native library gains its own CMakeLists.txt, with the same library
definition as the generic one, to register guest_savedata_delete.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01R5WJS4ZdQynAJesCZKH5hb
A .param file of a save directory or of save data memory that exists but cannot
be read, or whose size is not sizeof(SaveDataParam), was silently ignored or
truncated. It now throws, naming the file and, for a size mismatch, both sizes.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
sceSaveDataSetParam dropped the params, and sceSaveDataGetParam and
sceSaveDataDirNameSearch returned zeros, so a title that checks the params of
the save it found took its profile for a new one and rewrote it with defaults
on every boot. The params now live in a <directory>.param sidecar next to the
save directory, written by SetParam (mtime refreshed) and returned by GetParam
and by the directory search, with the directory's write time when no param
was stored yet.
The mount point is /savedata<N>, as on the console: a title read its profile
through /host//_sm/0/Profile when the mount point had another shape, and that
path does not exist.
The module logs the first three calls of each entry point, like the core
module; APS5_SAVEDATA_TRACE lifts the limit.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Rework the local SaveData implementation into a general-purpose, title-agnostic
backend used by both the native library and the standard libSceSaveData path:
- Directory aliasing: long save directory names are hashed into short mount
point aliases (persisted to disk) so they fit the SDK's fixed-size mount
point buffer, with the aliases reversed on directory search.
- Wildcard directory-name search (%/_ patterns) with sorting and optional
reverse order, matching the DirNameSearch contract.
- Save-data "memory" slots: small per-user, per-slot blobs the title can
set up, read and write without mounting a directory, backed by files under
the save root with a companion parameter blob, size and range validation
on every access, and a dirty flag consulted on commit.
- Async-flavored operations (backup, commit, memory sync) that queue
SaveDataEvent records consumed through GetEventResult and can be bound to
kernel event flags, plus transaction-resource and cancel/abort bookkeeping.
- Atomic file writes (temp file + rename) so a mid-write crash never leaves a
torn save on disk, and corrected/duplicated SDK error code constants.
- Local storage app-status get/set/delete and transferring-mount support for
PS4-to-PS5 style save transfers.
The native library keeps its own lighter-weight mount/memory implementation
(short "/_sm/<slot>" mount point aliases via the path-alias table) while
gaining the same per-user memory-slot separation, atomic writes and bounds
checking; the two implementations were merged by hand where upstream had
independently touched the native Export.cpp in the same area (backup/event
queue, short mount points) to keep both sets of improvements.
None of this is game-specific: it is a general local save-data backend that
works for any title and tolerates any user id.
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