LIMBO (CUSA01664)

[Get-fix]

Existing thread

• I searched this category for the title ID and no thread exists for this title on any platform.

Title

LIMBO (CUSA01664)

Content version tested

01.01

AnyPS5 commit

main e751dd2 with #6977 on top (that PR merges its dependencies #5138 #6354 #6357 #6381 #6684 #6527 #6702 #5991 #5992 #5993 #5994 #6519 #6618 #6619).

System tested

Windows 11 Pro 10.0.26200, WinLibs GCC 15.2, NVIDIA GeForce RTX 5060 Ti (driver 610.88)

Furthest point

In game

What is shown

The first retail PS4 game in game on AnyPS5, at full speed.

• Title screen, main menu and the opening forest, rendered correctly (fog, film grain, depth, silhouettes).
• 60 fps (600 presents per 10 s, 59.94 Hz vblank) in menu and in game; GPU 2.3-2.5 ms per frame on an RTX 5060 Ti; no storage write-backs.
• Sound plays: one AudioOut port, 48 kHz stereo float, consumed in real time.
• Input works: the menu responds and the boy walks, with the keyboard and with APS5_PAD_INPUT_FILE.
• Not tried yet: a full playthrough, saving and loading across sessions, Linux, macOS, AMD and Intel GPUs.

How it got here, for anyone bringing up the next PS4 title:

1. Convert: two relinker fixes for the eboot (fix(relinker): skip jump tables placed after a function's code #6618 jump tables after a function, fix(relinker): ignore unwind records that cover no code #6619 zero-length unwind records), plus the bundled libc.prx and libSceFios2.prx (fix(relinker): find the PLT before the code in PS4 modules #6354, fix(relinker): accept matching defined relative symbols #6357, fix(relinker): read the PS4 needed-module tag in guest modules #6381, fix(relinker): run a guest DT_INIT of 0 as the module initializer #6684, fix(relinker): leave weak imports of bundled modules unbound on Windows #6702 and a TLS relocation fix in feat: run PS4 games on the AGC driver — Limbo (CUSA01664) plays at 60 fps #6977).
2. GPU without a second recompiler: each GCN instruction is re-encoded to RDNA and decoded by the existing recompiler; a new libSceGnmDriver writes real PS4 packets and submits them to the AGC executor.
3. PS4 memory layouts: V# and T# descriptors converted to the PS5 layout, and the PS4 tile modes (thin, display, depth tile split, PRT) added to the GPU detiler as XOR equations, checked against addrlib's formulas.
4. The bugs that took longest: a GCN V# base is 44 bits (Limbo leaves 0x7 in bits 47:44, which made gameplay white), and a 1920x1080 render target is really 1920x1088, which cost a round trip through guest memory every frame (42 fps, slow motion) until it became a GPU copy.

Current blocker

None for the parts tested. Every piece Limbo needs is in open pull requests: #6977 and the dependencies listed above. Paths Limbo does not use still throw NotImplemented (3D and thick tile modes, interrupt flips, the PSN calls that need a signed-in user).

How it was run

relinker --windows --windows-gui --registry eboot.elf <out>/limbo.exe

run from a folder holding eboot.elf (the dump's decrypted eboot.bin without its SELF wrapper) and the dump's sce_module/, then the usage-guide layout with the game's files in app0/. Beyond the usage guide, libs/ needs three copies: libSceGnmDriver.prx as libSceGnmDriver_padebug.prx (the name Limbo imports), and libSceSaveData.native.prx and libSceSaveDataDialog.native.prx as libSceSaveData.prx and libSceSaveDataDialog.prx. No environment variables are needed; APS5_PROFILE_DRAW=1 prints the frame rate and GPU time every 10 s.

AI-assisted: yes (Claude Code)

🤖 Generated with Claude Code