FEX 2201 Tagged!

Another release with a lot changes this month!

• We now support BMI2, RDTSCP, CLZero.
• We tell the guest what ARM CPU name we are running on.
• We expose the hybrid CPU flag flag on big.LITTLE ARM SoCs.
• Bunches of syscall fixes, JIT compile time speed increases, usability improvements.
• Tons more.
• A new FEXRootFSFetcher tool for downloading prebuilt RootFS images.
• A Python script for automatically setting up an Ubuntu PPA and RootFS.
  • See our quick start guide to see how here
  • Or see the Ubuntu PPA here

FEXCore

Arm64

• Fixes vixl assertions around ubfm usage (5654f9a0)
• Fixes MapSelectCC FGT flag (13087f84)

CPUID

• Fixes another memory overflow issue (0e45b98f)
• Fixes crash on unknown CPU (be3e3a35)
• CPUID Expose Hybrid flag and CPU names (9394e49c)

Context

• Take some arguments as pointer-to-const (9d439047)

Dispatcher

• Disables unsync context message (154468c1)
• Adds more state reconstruction to state restore (fa6f1b1d)

OpcodeDispatcher

• Handle PDEP (0a3a270a)
• Handle PEXT (91984003)
• Implements RDTSCP (ee821b9c)
• Implements CLZero instruction (5f0dfcd7)

X86Tables

• Build Unknown op definition tables at compile time (e8670bba)
• Speed up initialization of X86Tables (e99a23cf)

HostFeatures

• Detect if the host CPU suports float exceptions (117cbde2)
• Consolidates HostFeatures flags (e24eb7a7)

IR

• Fixes sized constant mask (565d1e27)

  Misc

• Don’t use Run() inside RunUntilExit() (0bf57765)
• Fixes a memcpy overflow in processor brand (340699ca)
• Fixes FEXCore_Base config dependency (95bd309d)
• Implements recoverable INTO instruction (cd4269f4)
• Reorganizes some AOT related code (d4655fbb)

Linux Emulation/Syscalls

• Fixes pidfd_send_signal for 32-bit (ac63a2ba)
• Finish 32-bit msqid_ds usage (98210fdf)
• Implements the remaining 32-bit syscalls (bc120b9f)
• Fixes semid_ds_64 definition (f2fd9d9e)
• Fixes 32-bit shmctl (45430e95)
• Adds the safe syscall unimplemented gap for x86-64 (e05d116b)
• Enable warnings (75e5df54)
• Socket
• Resolve sign comparison mismatch cases (097f48f3)

Misc

CMake

• Adds an OVERRIDE_VERSION option (08085998)
• Adds a TUNE_CPU option (51466519)
• Adds experimental libc++ option (f3a27a57)

Build fixes

• Fixes build on Ubuntu 20.04 take 3 (8f835678)
• Fixes build on Ubuntu 20.04 take 2 (059e8a90)
• Fixes build on Ubuntu 20.04 (02005e71)
• Fixes Ubuntu 20.04 compilation on AArch64 (47bd4795)

Config

• Enables all host threads by default (edce9818)
• Sanitize Core option (9bffaeea)

Docs

• Adds documentation about the FEX monthly release process (a65e7a09)

GDBServer

• Fixes long string packet encodings (88ce9b5c)

Misc

• Stop hardcoding /usr/bin paths (1d5bd152)
• Improves compile ability for older libraries (c691d709)
• More AOT code movement (43dc232e)
• FEXMountDaemon squashfs fixes. (ea73c9d7)
• Update jemalloc for fixed libc overrides (c43af0e1)
• Implement thunk library generation using libclang (425d9323)
• {x32, x64}/Thread: Make use of .data() instead of .at(0) (b6499ac7)
• Adds a new ReentrantMutex to use for FEXCore (b9c49027)
• NetStream: Move NetBuf definition into cpp file (9860e8b7)

Tests

gvisor

• Disables flaky test (e62cb417)

  unittests

• Fixes a missing dependency on ASM tests (b078f511)
• Enables remaining unaligned atomic tests on ARMv8.0 (fd042476)
• Fixes known failures (5c4112f1)

RootFS

• Stop trying to retry rootfs after five times (a45bc759)
• Be more robust against stale lock files (d4b31cd4)

Tools

FEXConfig

• Removes jemalloc usage (c65be9f5)

FEXRootFSFetcher

• Remove 0x prefix on hash (b72245a2)
• Adds a new tool to help set up a new RootFS (72e8a997)

Scripts

• Adds a python script that can hand hold a user through FEX install (b276750c)

See the 2201 Release Notes or the detailed change log in Github.