![]() ![]() ![]() This was probably a good decision with regards to performance (though I’ll never know for sure), but a horrible decision with regards to readability, maintainability, and my sanity. ![]() Unfortunately, I made the decision to write nearly all of the gadgets in assembly language. The result is a speedup of roughly 3-5x compared to pure emulation. Instead it generates an array of pointers to functions called gadgets, and each gadget ends with a tailcall to the next function like the threaded code technique used by some Forth interpreters. It’s not actually a JIT since it doesn’t target machine code. Possibly the most interesting thing I wrote as part of iSH is the JIT. Grep for DEFAULT_CHANNEL to see if more log channels have been added since this list was updated.verbose: Debug logs that don’t fit into another category.instr: Logs every instruction executed by the emulator.strace: The most useful channel, logs the parameters and return value of almost every system call.With Meson (command line tool for testing): Run meson configure -Dlog=".In Xcode: Set the ISH_LOG setting in iSH.xcconfig to a space-separated list of log channels.ISH has several logging channels which can be enabled at build time. You can replace ish with tools/ptraceomatic to run the program in a real process and single step and compare the registers at each step. If tools/fakefsify doesn’t exist for you in your build directory, that might be because it couldn’t find libarchive on your system (see above for ways to install it.) ish -f alpine /bin/login -f root, assuming the output directory is called alpine. Then you can run things inside the Alpine filesystem with. tools/fakefsify, with the minirootfs tarball as the first argument and the name of the output directory as the second argument. To set up a self-contained Alpine linux filesystem, download the Alpine minirootfs tarball for i386 from the Alpine website and run. Then cd to the build directory and run ninja. To set up your environment, cd to the project and run meson build to create a build directory in build. If you run into any problems, open an issue and I’ll try to help. There are scripts that should do everything else automatically. ![]() Open the project in Xcode, open iSH.xcconfig, and change ROOT_BUNDLE_IDENTIFIER to something unique. libarchive ( brew install libarchive, sudo port install libarchive, sudo apt install libarchive-dev) TODO: bundle this dependency.if not, do something like sudo apt install libsqlite3-dev) sqlite3 (this is so common it may already be installed on linux and is definitely already installed on mac.Clang and LLD (on mac, brew install llvm, on linux, sudo apt install clang lldor sudo pacman -S clang lld or whatever).You’ll need these things to build the project: Nevertheless, this is a watershed moment for the jailbreak community! It will be interesting to see what the future holds for Linux on the iPhone.This project has a git submodule, make sure to clone with -recurse-submodules or run git submodule update -initafter cloning. The iOS operating system does not have access to it since the DFU mode is implemented at the hardware level. The reason being that checkra1n exploits a vulnerability in the DFU mode of an iPhone. Rodriguez also posted a video of booting Ubuntu to the GUI with a full desktop running on an iPhone.Ĭontrary to popular belief, simply booting into Linux will not let you run checkra1n jailbreak without connecting to a computer. You might think of it as a powerful Raspberry Pi at this point. The mobile device gets an IP address on your network as a computer. The USB ethernet gadget driver takes over the endpoint. You’re essentially using a Linux mobile device. When you boot into Ubuntu/Linux on an iPhone, your mobile device is not an iPhone anymore. For the uninitiated, Project Sandcastle lets you install Android and Linux on your iPhone as a secondary firmware on top of the stock iOS operating system. This port is based on the infamous Sandcastle project. Currently, Ubuntu relies on the generic frame buffer provided by the device’s operating system as a fallback measure. There’s no GPU support for Ubuntu at the moment. Coding the drivers from scratch, however, proved to be too difficult of a task. As surprising as it may sound, this is not the first time a Linux distro has been ported to the Apple iPhone.īack in the golden days of jailbreaking, David Wang aka planetbeing tried porting Linux to the iPhone. ![]()
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