From: Conor Dooley <conor.dooley@xxxxxxxxxxxxx> I've intentionally not turned on the gcc support, as discussed on v1. I've also switched over to using the target, but it is a bit heavier than the one arm64 seems to be using. RISC-V has fewer targets available and this was the closest. I preserved the redzone disabling, just moved into the Makefile. Any comment from Gary or the LLVM lads on the target would be great I think: https://github.com/rust-lang/rust/blob/master/compiler/rustc_target/src/spec/targets/riscv64imac_unknown_none_elf.rs arm64 is using: https://github.com/rust-lang/rust/blob/master/compiler/rustc_target/src/spec/targets/aarch64_unknown_none.rs I was gonna send this yesterday, but found out last minute I had invalid code in the target generation script. The kernel test robot had given my branch the global all-clear - the rust coverage with all the "depends on !FOO" must really limit the build coverage. I built for x86 with rust enabled locally this time to make sure.. As this as lifted from the state of the Rust-for-Linux tree, the commit messages from there cannot be preserved, so these patches have commit messages that I wrote. I've tested this on Icicle, and the modules seem to work as expected. Unfortunately there appear to be implicit 32-bit divisions (or similar) in core Rust code, so, as in the downstream Rust-for-Linux tree, Rust is only enabled for 64-bit. Thanks, Conor. Changes in v3: - Use a builtin target and modify it in kbuild - Drop the kCFI patch, that's been merged independently Changes in v2: - Rebase, since a good bit of time has passed! - Add the extra patch, disabling when CFI_CLANG is enabled. Changes in v1: - rebase on v6.3-rc1 - resort the `um` entry in the arch-support table while adding RISC-V to it - drop 32-bit bits - have another crack at assigning authorship Changes in RFC-RESEND: - fix the asymmetrical additions in the Makefile bits - add cc-cover to my git send-email command... CC: Miguel Ojeda <ojeda@xxxxxxxxxx> CC: Alex Gaynor <alex.gaynor@xxxxxxxxx> CC: Wedson Almeida Filho <wedsonaf@xxxxxxxxx> CC: Boqun Feng <boqun.feng@xxxxxxxxx> CC: Gary Guo <gary@xxxxxxxxxxx> CC: Björn Roy Baron <bjorn3_gh@xxxxxxxxxxxxxx> CC: Jonathan Corbet <corbet@xxxxxxx> CC: Paul Walmsley <paul.walmsley@xxxxxxxxxx> CC: Palmer Dabbelt <palmer@xxxxxxxxxxx> CC: Nathan Chancellor <nathan@xxxxxxxxxx> CC: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> CC: rust-for-linux@xxxxxxxxxxxxxxx CC: linux-doc@xxxxxxxxxxxxxxx CC: linux-kernel@xxxxxxxxxxxxxxx CC: linux-riscv@xxxxxxxxxxxxxxxxxxx CC: llvm@xxxxxxxxxxxxxxx Miguel Ojeda (1): RISC-V: enable building 64-bit kernels with rust support Documentation/rust/arch-support.rst | 1 + arch/riscv/Kconfig | 1 + arch/riscv/Makefile | 7 +++++++ scripts/generate_rust_target.rs | 6 ++++++ 4 files changed, 15 insertions(+) -- 2.43.0
