Ryan Houdek
4cff3e5f1f
Suggested by Alyssa. Adding an IR operation can be a little tedious
since you need to add the definition to JIT.cpp for the dispatch switch,
JITClass.h for the function declared, and then actually defining the
implementation in the correct file.
Instead support the common case where an IR operation just gets
dispatched through to the regular handler. This lets the developer just
put the function definition in to the json and the relevent cpp file and
it just gets picked up.
Some minor things:
- Needs to support dynamic dispatch for {Load,Store}Register and
{Load,Store}Mem
- This is just a bool in the json
- It needs to not output JIT dispatch for some IR operations
- SSE4.2 string instructions and x87 operations
- These go down the "Unhandled" path
- Needs to support a Dispatcher function override
- This is just for handling NoOp IR operations that get used for
other reasons.
- Finally removes VSMul and VUMul, consolidating to VMul
- Unlike V{U,S}Mull, signed or unsigned doesn't change behaviour here
- Fixed a couple random handler names not matching the IR operation
name.
FEX - Fast x86 emulation frontend
FEX allows you to run x86 and x86-64 binaries on an AArch64 host, similar to qemu-user and box86. It has native support for a rootfs overlay, so you don't need to chroot, as well as some thunklibs so it can forward things like GL to the host. FEX presents a Linux 5.0 interface to the guest, and supports both AArch64 and x86-64 as hosts. FEX is very much work in progress, so expect things to change.
Quick start guide
For Ubuntu 20.04, 21.04, 21.10, 22.04
Execute the following command in the terminal to install FEX through a PPA.
curl --silent https://raw.githubusercontent.com/FEX-Emu/FEX/main/Scripts/InstallFEX.py --output /tmp/InstallFEX.py && python3 /tmp/InstallFEX.py && rm /tmp/InstallFEX.py
This command will walk you through installing FEX through a PPA, and downloading a RootFS for use with FEX.
Ubuntu PPA is updated with our monthly releases.
For everyone else
Please see Building FEX.
Getting Started
FEX has been tested to build and run on ARMv8.0, ARMv8.1+, and x86-64(AVX or newer) hardware. ARMv7 and older x86 hardware will not work. Expected operating system usage is Linux. FEX has been tested with Ubuntu 20.04, 20.10, and 21.04. Also Arch Linux.
On AArch64 hosts the user MUST have an x86-64 RootFS Creating a RootFS.
Navigating the Source
See the Source Outline for more information.
Building FEX
Follow the guide on the official FEX-Emu Wiki here.
RootFS generation
AArch64 hosts require a rootfs for running applications. Follow the guide on the wiki page for seeing how to set up the rootfs from scratch https://wiki.fex-emu.com/index.php/Development:Setting_up_RootFS
