FEX-Emu/FEX

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A fast usermode x86 and x86-64 emulator for Arm64 Linux

Stars: 8k
Forks: 351
Open beginner issues: 0
Indexed issues: 233
Avg merge: 12h 31m
Merged PRs (30d): 102

Dominant language: C++
License: MIT
Last GitHub push: Sep 15, 2026
Latest indexed: Sep 16, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: good first issue

Open All

233 open issues indexed

Resolve paths passed to VFS/HLE to canonical Open

FEX-Emu/FEX#168 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Libraries we need to Thunk Open

FEX-Emu/FEX#267 · 8 comments · 0 reactions · 2 assignees · Indexed Sep 16, 2026
Simple applications for unit testing thunks Open

FEX-Emu/FEX#325 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
BTR is not tested sufficiently, doesn't implement fs/gs either Open

FEX-Emu/FEX#328 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Float to integer overflow doesn't match behaviour Open

FEX-Emu/FEX#413 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Performance CI Load testing Open

FEX-Emu/FEX#455 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Buildbot LoadCI integration Open

FEX-Emu/FEX#494 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Offline Debugging & Performance Analysis tools Open

FEX-Emu/FEX#495 · 2 comments · 0 reactions · 1 assignee · Indexed Sep 16, 2026
Support guest long jump from signal handler Open

FEX-Emu/FEX#518 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 16, 2026
If full visibility of x87 ops convert to 64bit with unsafe flags Open

FEX-Emu/FEX#676 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
cmake: Externals shouldn't leak their include paths into global space Open

FEX-Emu/FEX#720 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
x87: Correctly implement FREM Open

FEX-Emu/FEX#782 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Expand sar tests Open

good first issue Unittests

FEX-Emu/FEX#786 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
aotir: Hash function chunks, not min-max Open

FEX-Emu/FEX#798 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 16, 2026
Syscalls: Forked process shouldn't join thread that started before the fork Open

FEX-Emu/FEX#800 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 16, 2026
Code Flushing: Remove stale code from all theards Open

FEX-Emu/FEX#806 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 16, 2026
Code Flushing: Improve tracking data structures Open

FEX-Emu/FEX#807 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 16, 2026
Code Invalidation: RemoveCode shouldn't free IRLists, as that breaks self-invalidation in interpreter Open

FEX-Emu/FEX#808 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 16, 2026
Support mixture of guest and host robust futexes Open

FEX-Emu/FEX#809 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
AOT & IR Cache Planning Open

documentation

FEX-Emu/FEX#828 · 2 comments · 0 reactions · 1 assignee · Indexed Sep 16, 2026
Add error handling for memory allocation in TestHarnessRunner Open

good first issue

FEX-Emu/FEX#854 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Ensure all systemcalls auxiliary structures are multi threading safe Open

good first issue

FEX-Emu/FEX#866 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
ELF loading cleanups Open

FEX-Emu/FEX#908 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 16, 2026
LookupCache::Erase does not remove CodePages entry Open

FEX-Emu/FEX#1035 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 16, 2026
Walk through personality flags on 32-bit and 64-bit and ensure correct behaviour Open

FEX-Emu/FEX#1119 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Generate unit tests for LOCK ops that touch flags Open

FEX-Emu/FEX#1164 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Support thunking of vtables and function pointer members Open

FEX-Emu/FEX#1203 · 2 comments · 0 reactions · 1 assignee · Indexed Sep 16, 2026
Add stack guards on both ends of the thread stacks Open

FEX-Emu/FEX#1207 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Reasons to fork glibc Open

proposal

FEX-Emu/FEX#1208 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Serious Sam: The First Encounter crashes early in engine code Open

32bit Guest bug CPU emulation Game related Investigation

FEX-Emu/FEX#1214 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
CI for thunks Open

FEX-Emu/FEX#1280 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 16, 2026
Add wayland thunking Open

FEX-Emu/FEX#1299 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Add support for long jumps using veneer pools Open

FEX-Emu/FEX#1332 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 16, 2026
Some wine games might need ptrace Open

FEX-Emu/FEX#1335 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Implement libc thunk library Open

FEX-Emu/FEX#1505 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 16, 2026
IREmitter can't fail gracefully on large code blocks Open

FEX-Emu/FEX#1511 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 16, 2026
32-bit socket ioctls aren't interpreted correctly. Open

FEX-Emu/FEX#1532 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
FREM/FREM1: Support partial remainder Open

FEX-Emu/FEX#1537 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Forcing color output breaks VSCode Linux integration Open

FEX-Emu/FEX#1583 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
What is the extra slot used for? (I.e. why not just `MAX_SIGNALS` elements?) Open

FEX-Emu/FEX#1615 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 16, 2026
SMC/Mtrack: Add shm, mremap, madvise support Open

FEX-Emu/FEX#1638 · 6 comments · 0 reactions · 1 assignee · Indexed Sep 16, 2026
SMC/Mtrack: Add mirrored memory support Open

FEX-Emu/FEX#1639 · 3 comments · 0 reactions · 1 assignee · Indexed Sep 16, 2026
Inconsistency in RootFS handling between bare ELFs and shebangs Open

FEX-Emu/FEX#1647 · 3 comments · 1 reaction · 0 assignees · Indexed Sep 16, 2026
FEXDriver --aotircapture hangs during IR writing Open

FEX-Emu/FEX#1651 · 5 comments · 0 reactions · 1 assignee · Indexed Sep 16, 2026
AOTIR: Deleting the RAData inappropriately Open

FEX-Emu/FEX#1654 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 16, 2026
F64: MXCSR and FCW round modes mixed Open

FEX-Emu/FEX#1665 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 16, 2026
Deferred signals investigation Open

FEX-Emu/FEX#1666 · 5 comments · 0 reactions · 1 assignee · Indexed Sep 16, 2026
Expose HT for SMT ARM CPUs Open

FEX-Emu/FEX#1667 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Add tests for Context-wide code invalidations Open

FEX-Emu/FEX#1676 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 16, 2026
Make object ownership, lifetime and non-nullable pointers more obvious Open

FEX-Emu/FEX#1678 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 16, 2026

FEX-Emu/FEX

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