5  Android

Rizin can be cross-compiled for other architectures/systems as well, like Android.

5.0.1 Prerequisites

• Python 3
• Meson
• Ninja
• Git
• Android NDK

5.0.2 Step-by-step

5.0.2.1 Download and extract the Android NDK

Download the Android NDK from the official site and extract it somewhere on your system (e.g. /tmp/android-ndk)

5.0.2.2 Meson

See also BUILDING.md.

5.0.2.2.1 Create a cross-file for meson

Meson needs a configuration file that describes the cross compilation environment (e.g. meson-android.ini). You can adjust it as necessary, but something like the following should be a good starting point:

[binaries]
c       = '/tmp/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android28-clang'
cpp     = '/tmp/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android28-clang++'
ar      = '/tmp/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android-ar'
as      = '/tmp/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android-as'
ranlib  = '/tmp/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android-ranlib'
ld      = '/tmp/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android-ld'
strip   = '/tmp/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android-strip'
pkgconfig = 'false'

[properties]
sys_root = '/tmp/android-ndk/sysroot'

[host_machine]
system = 'android'
cpu_family = 'arm'
cpu = 'aarch64'
endian = 'little'

5.0.2.2.2 Compile with meson + ninja

Now setup the build directory with meson as usual:

$ meson --default-library static -Dstatic_runtime=true --prefix=/tmp/android-dir -Dblob=true build --cross-file ./meson-android.ini

A bit of explanation about all the options: * --default-library static -Dstatic_runtime=true: this ensure that libraries and binaries are statically compiled, so you do not need to properly set LD_ environment variables in your Android environment to make it find the right libraries. Binaries have everything they need inside. -Dblob=true: it tells meson to compile just one binary with all the needed code for running rizin, rz-bin, rz-asm, etc. and creates symbolic links to those names. This avoids creating many statically compiled large binaries and just create one that provides all features. You will still have rz-bin, rz-asm, rz-ax, etc. but they are just symlinks to rizin. * --cross-file ./meson-android.ini: it describes how to compile rizin for Android

Then compile and install the project:

$ ninja -C build
$ ninja -C build install

5.0.2.2.3 Move files to your android device and enjoy

At this point you can copy the generated files in /tmp/android-dir to your Android device and running rizin from it. For example:

$ cd /tmp && tar -cvf rizin-android.tar.gz android-dir
$ adb push rizin-android.tar.gz /data/local/tmp
$ adb shell
DEVICE:/ $ cd /data/local/tmp
DEVICE:/data/local/tmp $ tar xvf rizin-android.tar.gz
DEVICE:/data/local/tmp $ ./android-dir/bin/rizin
Usage: rizin [-ACdfLMnNqStuvwzX] [-P patch] [-p prj] [-a arch] [-b bits] [-i file]
          [-s addr] [-B baddr] [-m maddr] [-c cmd] [-e k=v] file|pid|-|--|=