atrosinenko / qemujs-builder

Build scripts for Qemu.js

This repo is not required anymore for the new version of QEMU.js (which is still even more work-in-progress, though).

This repository contains scripts for building Qemu.js (please see description for details). To build Qemu.js, clone this repository, navigate to its directory and run

git submodule update --init
cd qemu
mkdir build-emscripten
git submodule update --init dtc

Now you can start building:

1. Install the incoming version of Emscripten through the Emscripten SDK.

2. Until Emterpreter can run coroutines, one have to use the deprecated Asyncify. To use it with Qemu.js you need too apply two patches:

   • set new remote https://github.com/atrosinenko/emscripten.git up for the ./emscripten/incoming repository inside the SDK directory and merge the asyncify-qemu from there into incoming
   • in the ./clang/fastcomp/src/ repository merge the commit 19435d6 into incoming, then rebuild (cd ../build_incoming_64 && make) -- see this bug report for details

3. Navigate to stub, adjust opts.sh and run ./build-deps.sh inside it. Warning: it will download and build some libraries via plain http

4. Adjust guest architecture list in configure-cmd.sh

5. Navigate to qemu/build-emscripten and run

    emconfigure ../../configure-cmd.sh
    emmake make && ../../qemu-link.sh
   

6. Now you have files qemu-system-*.{js,html.mem,data} in your build directory -- it is Qemu.js. You also need the shell.html file from parent directory to run it. Running directly from the file system may not work, so use some HTTP server (the emrun tool from SDK is even capable of showing the console output of Emscripten-compiled code).