RosettaHack x87

Overview

This is an experimental project that modifies Apple's Rosetta technology to use less precise but significantly faster x87 instruction handlers.

⚠️ Warning: This is not ready for end-users. Use at your own risk.

Prerequisites

• macOS 14 or later
• C compiler (clang)
• CMake

Building

Main Project

cmake -B build
cmake --build build

Sample Test Program

clang -v -arch x86_64 -mno-sse -mfpmath=387 ./sample/math.c -o ./build/math

Running

Run the target program from the build folder:

./rosettax87 ./math

You will see a popup asking you to authorize debugging. Once approved, the process granted debug session. Reference: Debugging tool entitlement

Alternatively (Not Recommended), you can disable Debugging Restrictions part of System Integrity Protection (SIP) by running csrutil enable --without debug in macOS Recovery.

Warning: This reduces system security. NOT recommended.

Technical Details

Windows Applications Through Wine

You can use the brew wine@devel cask with RosettaHack x87. It supports launching Windows applications through Wine with an environment variable ROSETTA_X87_PATH.

1. Install wine@devel using Homebrew

brew install --cask wine@devel

2. To permanently set the environment variable, add the following to your ~/.bashrc or ~/.zshrc file:

export ROSETTA_X87_PATH=/Path/To/rosettax87

3. Run the Windows application

wine PATH_TO_BINARY.exe

License

This project is licensed under MIT.