I used "gccLinux64" makefile to create the UASM binary for aarch64 Linux (For use with RaspberryPi) , it works well, but how do I compile a code targeting ARM64 architecture using UASM
You can use that like cross-assembler.
Later: not so clear I think.
You can use UASM in ARM64 to build x86/x64 binaries.
You don't. ARM64 instructions are different. UASM targets only x86 architectures.