Monthly archives: October 2020

Adding an Instruction to the GNU Assembler

Binutils is a huge piece of code and new users can often feel lost and out of their depth when navigating it alone. To help ease the shock, in this post we’ll look at the very simplest step of adding a new basic instruction to an already defined extension and how to add a corresponding GNU Assembler (GAS) test.

While the examples and files given are all RISC-V specific, the information is transferable to other architecture ports, however tables and structures may differ. More information can be found through the binutils project page.