Compiler

This is the main nu+ compiler documentation page

How to compile a kernel for the NuPlus architecture

Some kernels are provided with the standard release of the NuPlus toolchain. We provide makefile to compile these kernels for NuPlus. In case you want to add a new kernel, it is suggested to copy a kernel folder and replace C/CPP files with your own source code. Then, remember to modify the makefile updating the SRCS variable with the current main C/CPP filename. When using these makefiles, different tools are called:

• Clang to emit the LLVM IR and the object files
• LLD/MCLINKER to handle the job of linking
• elf2hex to generate the HEX file from the ELF file
• llvm-objdump to generate the dump from the elf file

In order to change the optimization level of the compiler or any other flag, it is possible to modify the /misc/NuPlus.mk file.

Backend for a custom target architecture

Adding a new target architecture, i.e. nu+, to llvm requires four steps:

• write all backend files and place them into the lib/Target/NuPlus folder
• modify the Clang frontend
• register and add the new backend to llvm
• modify and/or add all the external tools that are used by llvm, i.e. linker, disassembler, etc..