AnyPS5/docs/dev/TechnicalDebt.md

Project technical debt

Build

• Building on Windows requires a specific version of mingw - MinGW-w64 GCC 15.2.0 (winlibs-gcc15, x86_64-ucrt-posix-seh)
• Even compiled prx libraries on Windows require nearby (static linking of these dependencies causes conflicts):
  • libgcc_s_seh-1.dll
  • libstdc++-6.dll
  • libwinpthread-1.dll

Silent stubs

Throughout the project, every function at every stage either does exactly what it's supposed to or throws an exception. Everywhere... except:

• libSceSaveDataDialog.native
• libSceCommonDialog
• The shader recompiler skips baryctric coordinates (is not even passed to SpirvTargetOptions at row 212).

Unknown function info

• zARR5aCmkoY (libSceAgc) - unknown name, signature
• qj7QZpgr9Uw (libSceAgc) - unknown name
• fd5Bp5tGTgo (libSceAgc) - unknown name
• dolOmWH+huQ (libSceAgc) - unknown name
• V++UgBtQhn0 (libSceAgc) - unknown name
• gQkqkLttcpw (libSceAgc) - unknown name, signature
• sceKernelInternalMemoryGetModuleSegmentInfo (libkernel) - unknown signature
• sceLibcInternalBacktraceForGame (libSceLibcInternal, implemented in libc) - unknown signature
• sceLibcInternalHeapErrorReportForGame (libSceLibcInternal, implemented in libc) - unknown signature
• __progname (libkernel) - unknown data export

Functional

• Shader recompilation currently occurs right before it was transferred to Vulkan with caching, but should be moved to the relinker stage. For this purpose, shader/recompiler was written completely independently from libs/prx.
• The executable file that relinker generates opens the console when launched, which is inconvenient for playability.
• libSceJpegEnc encodes 4:2:2 sampling requests with 4:2:0 chroma subsampling: the JPEG encoder (stb) only produces 4:2:0 and 4:4:4.
• Relinker doesn't add an icon to the generated executable. This should be done without adding dependencies (only standard).
• --to-intel does not lower the register form of INSERTQ (F2 0F 79) nor MONITORX/MWAITX/CLZERO/RDPRU/MCOMMIT; the lowering fails the relink instead. SHA-NI is not substituted.
• The length-changing path of the instruction rewriter is not used by the converter: it does not adjust VEX/0F38/0F3A RIP-relative operands, data-to-code references (relocations, FDEs, jump tables) or segment sizes, so every substitution keeps the instruction length.
• The Linux placement of the --to-intel stubs in the ELF patcher is covered only by a synthetic test.
• The libc SSE4a trap emulation on Windows is superseded by --to-intel and remains only until the relinked title has been verified without it.
• --to-intel lowerings that need a stub section are rejected for sce_module guest modules: the guest module builder does not pass stub sites to the guest module writer.
• The game can expect its modified prx from the sce_module/sce_modules folder - this support is not implemented.