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| author | David Gow <davidgow@google.com> | 2024-06-05 00:40:50 +0200 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2024-07-03 12:22:22 +0200 |
| commit | ab0f4cedc3554f921691ce5b63d59e258154e799 (patch) | |
| tree | fd0cc6080f8c456a3646207d65046c05f69fae59 /arch/um | |
| parent | arch: um: rust: Use the generated target.json again (diff) | |
| download | linux-ab0f4cedc3554f921691ce5b63d59e258154e799.tar.xz linux-ab0f4cedc3554f921691ce5b63d59e258154e799.zip | |
arch: um: rust: Add i386 support for Rust
At present, Rust in the kernel only supports 64-bit x86, so UML has
followed suit. However, it's significantly easier to support 32-bit i386
on UML than on bare metal, as UML does not use the -mregparm option
(which alters the ABI), which is not yet supported by rustc[1].
Add support for CONFIG_RUST on um/i386, by adding a new target config to
generate_rust_target, and replacing various checks on CONFIG_X86_64 to
also support CONFIG_X86_32.
We still use generate_rust_target, rather than a built-in rustc target,
in order to match x86_64, provide a future place for -mregparm, and more
easily disable floating point instructions.
With these changes, the KUnit tests pass with:
kunit.py run --make_options LLVM=1 --kconfig_add CONFIG_RUST=y
--kconfig_add CONFIG_64BIT=n --kconfig_add CONFIG_FORTIFY_SOURCE=n
An earlier version of these changes was proposed on the Rust-for-Linux
github[2].
[1]: https://github.com/rust-lang/rust/issues/116972
[2]: https://github.com/Rust-for-Linux/linux/pull/966
Signed-off-by: David Gow <davidgow@google.com>
Link: https://patch.msgid.link/20240604224052.3138504-1-davidgow@google.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'arch/um')
| -rw-r--r-- | arch/um/Kconfig | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/um/Kconfig b/arch/um/Kconfig index 758016731156..e08a4a1a4bb6 100644 --- a/arch/um/Kconfig +++ b/arch/um/Kconfig @@ -31,7 +31,7 @@ config UML select TRACE_IRQFLAGS_SUPPORT select TTY # Needed for line.c select HAVE_ARCH_VMAP_STACK - select HAVE_RUST if X86_64 + select HAVE_RUST config MMU bool |