Used to monitor svc calls of running android apps
SET PATH=%PATH%;D:\ProgramFiles\Android\Sdk\ndk\21.1.6352462\toolchains\llvm\prebuilt\windows-x86_64\bin
clang -target armv7a-linux-androideabi21 attach.c -o monitorSVC
adb push monitorSVC /data/local/tmp
adb shell chmod 777 /data/local/tmp/monitorSVC
adb shell
./data/local/tmp/monitorSVC -p $pid <pid to be traced>
[-L] <list sysCallTable>
[-v sysCallNo]* <ignore sysCallNo>
[-e sysCallNo]* <filter sysCallNo>