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If you appreciate this project, you can support me on Patreon ! Patreon !

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About

This example demonstrates how to :

  • assemble a library written with the ARMv8-A 64 bits GNU ASsembly syntax
  • call a native procedure, included in this library, from an Android app using the JNI.

The called procedure will then call back a Java method, defined in the Android Application, using the JNI helpers.

Building

Building using GNU Make

Requirements

  • GNU AS (aarch64)
  • Gold linker (aarch64)
  • An ARMv8-A 64 bits Android phone/emulator on which you have installation privileges

Build

Run make from this folder

Manually

Run the following commands :

# cross compiler prefix. Remove if you're assembling from an ARM machine
export PREFIX="aarch64-linux-gnu"
export APP_DIR="./apk"
export LIBNAME="libarcane.so"
${PREFIX}-as -o decypherArcane.o decypherArcane.s
${PREFIX}-ld.gold -shared --dynamic-linker=/system/bin/linker -shared --hash-style=sysv -o $LIBNAME decypherArcane.o
mkdir -p $APP_DIR/app/src/main/jniLibs/arm64-v8a
cp $LIBNAME $APP_DIR/app/src/main/jniLibs/arm64-v8a

Building using Android ndk-build

Requirements

  • The Android NDK path in your system's PATH directory

Build

  • On Windows, run 'mkbuild.bat'
  • On Linux, run 'mkbuild.sh'

Installing the prepared APK

  • Connect your ARMv8-A 64 bits Android phone/emulator
  • open a shell or a "command window"
  • cd to the apk folder

Then :

  • On Windows run gradlew installDebug.
  • On Linux run ./gradlew installDebug