This lets system calls accept arguments by putting them in their signatures. Jira Issue: https://gem5.atlassian.net/browse/GEM5-187 Change-Id: Ieb32b8b5592d894e493466717613ff16e2a03768 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/23191 Reviewed-by: Gabe Black <gabeblack@google.com> Maintainer: Gabe Black <gabeblack@google.com> Tested-by: kokoro <noreply+kokoro@google.com>