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https://github.com/torvalds/linux
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ab0f4cedc3
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>
60 lines
2 KiB
Makefile
60 lines
2 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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###
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# scripts contains sources for various helper programs used throughout
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# the kernel for the build process.
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hostprogs-always-$(CONFIG_KALLSYMS) += kallsyms
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hostprogs-always-$(BUILD_C_RECORDMCOUNT) += recordmcount
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hostprogs-always-$(CONFIG_BUILDTIME_TABLE_SORT) += sorttable
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hostprogs-always-$(CONFIG_ASN1) += asn1_compiler
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hostprogs-always-$(CONFIG_MODULE_SIG_FORMAT) += sign-file
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hostprogs-always-$(CONFIG_SYSTEM_EXTRA_CERTIFICATE) += insert-sys-cert
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hostprogs-always-$(CONFIG_RUST_KERNEL_DOCTESTS) += rustdoc_test_builder
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hostprogs-always-$(CONFIG_RUST_KERNEL_DOCTESTS) += rustdoc_test_gen
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ifneq ($(or $(CONFIG_X86_64),$(CONFIG_X86_32)),)
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always-$(CONFIG_RUST) += target.json
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filechk_rust_target = $< < include/config/auto.conf
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$(obj)/target.json: scripts/generate_rust_target include/config/auto.conf FORCE
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$(call filechk,rust_target)
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endif
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hostprogs += generate_rust_target
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generate_rust_target-rust := y
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rustdoc_test_builder-rust := y
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rustdoc_test_gen-rust := y
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HOSTCFLAGS_sorttable.o = -I$(srctree)/tools/include
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HOSTLDLIBS_sorttable = -lpthread
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HOSTCFLAGS_asn1_compiler.o = -I$(srctree)/include
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HOSTCFLAGS_sign-file.o = $(shell $(HOSTPKG_CONFIG) --cflags libcrypto 2> /dev/null)
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HOSTLDLIBS_sign-file = $(shell $(HOSTPKG_CONFIG) --libs libcrypto 2> /dev/null || echo -lcrypto)
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ifdef CONFIG_UNWINDER_ORC
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ifeq ($(ARCH),x86_64)
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SRCARCH := x86
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endif
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ifeq ($(ARCH),loongarch)
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SRCARCH := loongarch
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endif
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HOSTCFLAGS_sorttable.o += -I$(srctree)/tools/arch/$(SRCARCH)/include
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HOSTCFLAGS_sorttable.o += -DUNWINDER_ORC_ENABLED
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endif
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ifdef CONFIG_BUILDTIME_MCOUNT_SORT
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HOSTCFLAGS_sorttable.o += -DMCOUNT_SORT_ENABLED
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endif
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# The following programs are only built on demand
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hostprogs += unifdef
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# The module linker script is preprocessed on demand
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targets += module.lds
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subdir-$(CONFIG_GCC_PLUGINS) += gcc-plugins
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subdir-$(CONFIG_MODVERSIONS) += genksyms
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subdir-$(CONFIG_SECURITY_SELINUX) += selinux
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# Let clean descend into subdirs
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subdir- += basic dtc gdb kconfig mod
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