Good afternoon folks, As part of a research project I have been trying to setup a Gem5 simulation with a RISC-V ISA while adding in a custom operation. I found a handful of old articles <https://nitish2112.github.io/post/adding-instruction-riscv/> [2 <https://stackoverflow.com/questions/32953911/how-to-add-a-new-custom-instruction-in-the-riscv-instruction-set>] and videos <https://youtu.be/Z5B02jkNpck> on how to accomplish this but appear to be out of date. I noticed there is a gem5 doc on ISA Parsing <https://www.gem5.org/documentation/general_docs/architecture_support/isa_parser/> that has a few unfinished sections. I tried following the tutorial but have run into some issues getting the RISC-V tools to compile. After spending a lot of time trying to build things, I've found myself stuck on this error when trying to build the riscv-pk project: gcc: error: unrecognized argument in option '-mcmodel=medany' gcc: note: valid arguments to '-mcmodel=' are: 32 kernel large medium small make: *** [Makefile:319: file.o] Error 1 Does anyone know if I'm going down the wrong path here? Is there a good tutorial that you recommend? Thanks all, Nick Felker

Hi Nick, One of the common reasons you might see the error you are noticing is if you somehow end up using the host compiler instead of the RISC-V compiler. I will recommend that you verify that riscv toolchain directory is added to your $PATH. See this for reference: https://github.com/riscv-software-src/riscv-tools/issues/292 -Ayaz On Sat, Jun 3, 2023 at 9:36 AM Nick F via gem5-users <gem5-users@gem5.org> wrote: > Good afternoon folks, > > As part of a research project I have been trying to setup a Gem5 > simulation with a RISC-V ISA while adding in a custom operation. I found a > handful of old articles > <https://nitish2112.github.io/post/adding-instruction-riscv/> [2 > <https://stackoverflow.com/questions/32953911/how-to-add-a-new-custom-instruction-in-the-riscv-instruction-set>] > and videos <https://youtu.be/Z5B02jkNpck> on how to accomplish this but > appear to be out of date. I noticed there is a gem5 doc on ISA Parsing > <https://www.gem5.org/documentation/general_docs/architecture_support/isa_parser/> > that has a few unfinished sections. > > I tried following the tutorial but have run into some issues getting the > RISC-V tools to compile. > > After spending a lot of time trying to build things, I've found myself > stuck on this error when trying to build the riscv-pk project: > > > gcc: error: unrecognized argument in option '-mcmodel=medany' > > gcc: note: valid arguments to '-mcmodel=' are: 32 kernel large medium small > make: *** [Makefile:319: file.o] Error 1 > > Does anyone know if I'm going down the wrong path here? Is there a good > tutorial that you recommend? > > Thanks all, > > Nick Felker > _______________________________________________ > gem5-users mailing list -- gem5-users@gem5.org > To unsubscribe send an email to gem5-users-leave@gem5.org >