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The overlap audit against origin/main and the open pull requests found 39 of the 193 declared exports that must not be declared here: - 14 that origin/main already exports. The nid_patcher computes the NID of a symbol from its name, and a name ending in _nid_postfix exports the NID of the base name, so scePadOpen, sceNetInit and the rest are already there. - 23 that an open pull request provides: #6832, #6847, #6852, #7846, #7881, #7889, #7890, #6977 and #7690. - 2 whose technical-debt file an open pull request creates: #7463 and #8094. The scope is now 30 libraries and 154 exports.
13 lines
3.2 KiB
Markdown
13 lines
3.2 KiB
Markdown
# libSceFiber technical debt
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### Functional
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- [sceFiberGetInfo](../../../core/libs/prx/libSceFiber/Export.cpp) reports the requested-size window at the top of the host stack used for execution, rather than the original caller buffer, which is retained and pinned. The additional 1 MiB host-call margin below that window is not included in `size_context`. Planet Coaster (PPSA01736 v01.017) uses this range for ChakraCore garbage-collector stack scans; reporting the unused caller buffer makes the scan cross unmapped memory. The range is covered by a regression test while running, switching and migrating a fiber between threads. Console behavior for substituted host stacks has no direct equivalent and is not measured.
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### Unknown function info
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- [_sceFiberInitializeWithInternalOptionImpl](../../../core/libs/prx/libSceFiber/Export.cpp) (libSceFiber) - its signature follows shadPS4's [initialize implementations](https://github.com/shadps4-emu/shadPS4/blob/f68923fe807f657348e6719ce658bcbd0a2b1c72/src/core/libraries/fiber/fiber.cpp#L150-L153); its export alias is mapped at [RegisterLib](https://github.com/shadps4-emu/shadPS4/blob/f68923fe807f657348e6719ce658bcbd0a2b1c72/src/core/libraries/fiber/fiber.cpp#L548-L551). Not measured on a console; the throwing declaration only resolves the import.
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- [_sceFiberAttachContextAndRun, _sceFiberAttachContextAndSwitch](../../../core/libs/prx/libSceFiber/Export.cpp) (libSceFiber) - signatures follow shadPS4's [run implementation](https://github.com/shadps4-emu/shadPS4/blob/f68923fe807f657348e6719ce658bcbd0a2b1c72/src/core/libraries/fiber/fiber.cpp#L260-L261) and [switch implementation](https://github.com/shadps4-emu/shadPS4/blob/f68923fe807f657348e6719ce658bcbd0a2b1c72/src/core/libraries/fiber/fiber.cpp#L336-L337); their export aliases are mapped at [RegisterLib](https://github.com/shadps4-emu/shadPS4/blob/f68923fe807f657348e6719ce658bcbd0a2b1c72/src/core/libraries/fiber/fiber.cpp#L555-L563). Not measured on a console; the throwing declarations only resolve imports.
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- [_sceFiberGetThreadFramePointerAddress](../../../core/libs/prx/libSceFiber/Export.cpp) (libSceFiber, NID `0dy4JtMUcMQ`) forwards to `sceFiberGetThreadFramePointerAddress`; that the argument list matches is inferred from the export without the underscore, as for the underscore Ult exports, not measured
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- [Fiber stacks](../../../core/libs/prx/libSceFiber/Export.cpp) (libSceFiber) - a fiber whose context is smaller than 64 KiB runs on an mmap'd host stack of its context size plus 1 MiB, so host calls made from it (21 KiB deep when PPSA01341 reaches SPIRV-Tools from a 16 KiB context) do not overwrite the contexts packed next to it; a larger context is the stack, as on the console. PPSA05684 needs the second: its job fibers have 64 KiB and 512 KiB contexts, the 512 KiB ones at 1 MiB-aligned addresses, and find their job record by masking the stack pointer (`~0xfffff` for the 512 KiB ones), which a host stack breaks (the game waits forever in GameInit, or faults later in a 64 KiB fiber). The 64 KiB limit is chosen between these two titles, not measured: a title with small contexts that also derives state from the stack pointer, or one whose host calls exceed what is left of a large context, is not covered
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