This might be relevant A Retargetable C Compiler: Design and Implementation by David Hanson and Chritopher Fraser https://www.amazon.com/Retargetable-Compiler

This might be relevant A Retargetable C Compiler: Design and Implementation by David Hanson and Chritopher Fraser https://www.amazon.com/Retargetable-Compiler-Design-Implementation/dp/0805316701 https://www.amazon.com/Retargetable-Compiler-Design-Implemen... Written in a literate programming style.