rust/Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2
   3 # Where to place rustdoc generated documentation
   4 rustdoc_output := $(objtree)/Documentation/output/rust/rustdoc
   5
   6 obj-$(CONFIG_RUST) += core.o compiler_builtins.o ffi.o
   7 always-$(CONFIG_RUST) += exports_core_generated.h
   8
   9 # Missing prototypes are expected in the helpers since these are exported
  10 # for Rust only, thus there is no header nor prototypes.
  11 obj-$(CONFIG_RUST) += helpers/helpers.o
  12 CFLAGS_REMOVE_helpers/helpers.o = -Wmissing-prototypes -Wmissing-declarations
  13
  14 always-$(CONFIG_RUST) += libmacros.so
  15 no-clean-files += libmacros.so
  16
  17 always-$(CONFIG_RUST) += bindings/bindings_generated.rs bindings/bindings_helpers_generated.rs
  18 obj-$(CONFIG_RUST) += bindings.o kernel.o
  19 always-$(CONFIG_RUST) += exports_helpers_generated.h \
  20     exports_bindings_generated.h exports_kernel_generated.h
  21
  22 always-$(CONFIG_RUST) += uapi/uapi_generated.rs
  23 obj-$(CONFIG_RUST) += uapi.o
  24
  25 ifdef CONFIG_RUST_BUILD_ASSERT_ALLOW
  26 obj-$(CONFIG_RUST) += build_error.o
  27 else
  28 always-$(CONFIG_RUST) += build_error.o
  29 endif
  30
  31 obj-$(CONFIG_RUST) += exports.o
  32
  33 always-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated.rs
  34 always-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated_kunit.c
  35
  36 obj-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated.o
  37 obj-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated_kunit.o
  38
  39 always-$(subst y,$(CONFIG_RUST),$(CONFIG_JUMP_LABEL)) += kernel/generated_arch_static_branch_asm.rs
  40
  41 # Avoids running `$(RUSTC)` for the sysroot when it may not be available.
  42 ifdef CONFIG_RUST
  43
  44 # `$(rust_flags)` is passed in case the user added `--sysroot`.
  45 rustc_sysroot := $(shell MAKEFLAGS= $(RUSTC) $(rust_flags) --print sysroot)
  46 rustc_host_target := $(shell $(RUSTC) --version --verbose | grep -F 'host: ' | cut -d' ' -f2)
  47 RUST_LIB_SRC ?= $(rustc_sysroot)/lib/rustlib/src/rust/library
  48
  49 ifneq ($(quiet),)
  50 rust_test_quiet=-q
  51 rustdoc_test_quiet=--test-args -q
  52 rustdoc_test_kernel_quiet=>/dev/null
  53 endif
  54
  55 core-cfgs = \
  56     --cfg no_fp_fmt_parse
  57
  58 quiet_cmd_rustdoc = RUSTDOC $(if $(rustdoc_host),H, ) $<
  59       cmd_rustdoc = \
  60         OBJTREE=$(abspath $(objtree)) \
  61         $(RUSTDOC) $(filter-out $(skip_flags),$(if $(rustdoc_host),$(rust_common_flags),$(rust_flags))) \
  62                 $(rustc_target_flags) -L$(objtree)/$(obj) \
  63                 -Zunstable-options --generate-link-to-definition \
  64                 --output $(rustdoc_output) \
  65                 --crate-name $(subst rustdoc-,,$@) \
  66                 $(if $(rustdoc_host),,--sysroot=/dev/null) \
  67                 @$(objtree)/include/generated/rustc_cfg $<
  68
  69 # The `html_logo_url` and `html_favicon_url` forms of the `doc` attribute
  70 # can be used to specify a custom logo. However:
  71 #   - The given value is used as-is, thus it cannot be relative or a local file
  72 #     (unlike the non-custom case) since the generated docs have subfolders.
  73 #   - It requires adding it to every crate.
  74 #   - It requires changing `core` which comes from the sysroot.
  75 #
  76 # Using `-Zcrate-attr` would solve the last two points, but not the first.
  77 # The https://github.com/rust-lang/rfcs/pull/3226 RFC suggests two new
  78 # command-like flags to solve the issue. Meanwhile, we use the non-custom case
  79 # and then retouch the generated files.
  80 rustdoc: rustdoc-core rustdoc-macros rustdoc-compiler_builtins \
  81     rustdoc-kernel
  82         $(Q)cp $(srctree)/Documentation/images/logo.svg $(rustdoc_output)/static.files/
  83         $(Q)cp $(srctree)/Documentation/images/COPYING-logo $(rustdoc_output)/static.files/
  84         $(Q)find $(rustdoc_output) -name '*.html' -type f -print0 | xargs -0 sed -Ei \
  85                 -e 's:rust-logo-[0-9a-f]+\.svg:logo.svg:g' \
  86                 -e 's:favicon-[0-9a-f]+\.svg:logo.svg:g' \
  87                 -e 's:<link rel="alternate icon" type="image/png" href="[/.]+/static\.files/favicon-(16x16|32x32)-[0-9a-f]+\.png">::g' \
  88                 -e 's:<a href="srctree/([^"]+)">:<a href="$(realpath $(srctree))/\1">:g'
  89         $(Q)for f in $(rustdoc_output)/static.files/rustdoc-*.css; do \
  90                 echo ".logo-container > img { object-fit: contain; }" >> $$f; done
  91
  92 rustdoc-macros: private rustdoc_host = yes
  93 rustdoc-macros: private rustc_target_flags = --crate-type proc-macro \
  94     --extern proc_macro
  95 rustdoc-macros: $(src)/macros/lib.rs FORCE
  96         +$(call if_changed,rustdoc)
  97
  98 # Starting with Rust 1.82.0, skipping `-Wrustdoc::unescaped_backticks` should
  99 # not be needed -- see https://github.com/rust-lang/rust/pull/128307.
 100 rustdoc-core: private skip_flags = -Wrustdoc::unescaped_backticks
 101 rustdoc-core: private rustc_target_flags = $(core-cfgs)
 102 rustdoc-core: $(RUST_LIB_SRC)/core/src/lib.rs FORCE
 103         +$(call if_changed,rustdoc)
 104
 105 rustdoc-compiler_builtins: $(src)/compiler_builtins.rs rustdoc-core FORCE
 106         +$(call if_changed,rustdoc)
 107
 108 rustdoc-ffi: $(src)/ffi.rs rustdoc-core FORCE
 109         +$(call if_changed,rustdoc)
 110
 111 rustdoc-kernel: private rustc_target_flags = --extern ffi \
 112     --extern build_error --extern macros=$(objtree)/$(obj)/libmacros.so \
 113     --extern bindings --extern uapi
 114 rustdoc-kernel: $(src)/kernel/lib.rs rustdoc-core rustdoc-ffi rustdoc-macros \
 115     rustdoc-compiler_builtins $(obj)/libmacros.so \
 116     $(obj)/bindings.o FORCE
 117         +$(call if_changed,rustdoc)
 118
 119 quiet_cmd_rustc_test_library = RUSTC TL $<
 120       cmd_rustc_test_library = \
 121         OBJTREE=$(abspath $(objtree)) \
 122         $(RUSTC) $(rust_common_flags) \
 123                 @$(objtree)/include/generated/rustc_cfg $(rustc_target_flags) \
 124                 --crate-type $(if $(rustc_test_library_proc),proc-macro,rlib) \
 125                 --out-dir $(objtree)/$(obj)/test --cfg testlib \
 126                 -L$(objtree)/$(obj)/test \
 127                 --crate-name $(subst rusttest-,,$(subst rusttestlib-,,$@)) $<
 128
 129 rusttestlib-build_error: $(src)/build_error.rs FORCE
 130         +$(call if_changed,rustc_test_library)
 131
 132 rusttestlib-ffi: $(src)/ffi.rs FORCE
 133         +$(call if_changed,rustc_test_library)
 134
 135 rusttestlib-macros: private rustc_target_flags = --extern proc_macro
 136 rusttestlib-macros: private rustc_test_library_proc = yes
 137 rusttestlib-macros: $(src)/macros/lib.rs FORCE
 138         +$(call if_changed,rustc_test_library)
 139
 140 rusttestlib-kernel: private rustc_target_flags = --extern ffi \
 141     --extern build_error --extern macros \
 142     --extern bindings --extern uapi
 143 rusttestlib-kernel: $(src)/kernel/lib.rs \
 144     rusttestlib-bindings rusttestlib-uapi rusttestlib-build_error \
 145     $(obj)/libmacros.so $(obj)/bindings.o FORCE
 146         +$(call if_changed,rustc_test_library)
 147
 148 rusttestlib-bindings: private rustc_target_flags = --extern ffi
 149 rusttestlib-bindings: $(src)/bindings/lib.rs rusttestlib-ffi FORCE
 150         +$(call if_changed,rustc_test_library)
 151
 152 rusttestlib-uapi: private rustc_target_flags = --extern ffi
 153 rusttestlib-uapi: $(src)/uapi/lib.rs rusttestlib-ffi FORCE
 154         +$(call if_changed,rustc_test_library)
 155
 156 quiet_cmd_rustdoc_test = RUSTDOC T $<
 157       cmd_rustdoc_test = \
 158         RUST_MODFILE=test.rs \
 159         OBJTREE=$(abspath $(objtree)) \
 160         $(RUSTDOC) --test $(rust_common_flags) \
 161                 @$(objtree)/include/generated/rustc_cfg \
 162                 $(rustc_target_flags) $(rustdoc_test_target_flags) \
 163                 $(rustdoc_test_quiet) \
 164                 -L$(objtree)/$(obj)/test --output $(rustdoc_output) \
 165                 --crate-name $(subst rusttest-,,$@) $<
 166
 167 quiet_cmd_rustdoc_test_kernel = RUSTDOC TK $<
 168       cmd_rustdoc_test_kernel = \
 169         rm -rf $(objtree)/$(obj)/test/doctests/kernel; \
 170         mkdir -p $(objtree)/$(obj)/test/doctests/kernel; \
 171         OBJTREE=$(abspath $(objtree)) \
 172         $(RUSTDOC) --test $(rust_flags) \
 173                 -L$(objtree)/$(obj) --extern ffi --extern kernel \
 174                 --extern build_error --extern macros \
 175                 --extern bindings --extern uapi \
 176                 --no-run --crate-name kernel -Zunstable-options \
 177                 --sysroot=/dev/null \
 178                 --test-builder $(objtree)/scripts/rustdoc_test_builder \
 179                 $< $(rustdoc_test_kernel_quiet); \
 180         $(objtree)/scripts/rustdoc_test_gen
 181
 182 %/doctests_kernel_generated.rs %/doctests_kernel_generated_kunit.c: \
 183     $(src)/kernel/lib.rs $(obj)/kernel.o \
 184     $(objtree)/scripts/rustdoc_test_builder \
 185     $(objtree)/scripts/rustdoc_test_gen FORCE
 186         +$(call if_changed,rustdoc_test_kernel)
 187
 188 # We cannot use `-Zpanic-abort-tests` because some tests are dynamic,
 189 # so for the moment we skip `-Cpanic=abort`.
 190 quiet_cmd_rustc_test = RUSTC T  $<
 191       cmd_rustc_test = \
 192         OBJTREE=$(abspath $(objtree)) \
 193         $(RUSTC) --test $(rust_common_flags) \
 194                 @$(objtree)/include/generated/rustc_cfg \
 195                 $(rustc_target_flags) --out-dir $(objtree)/$(obj)/test \
 196                 -L$(objtree)/$(obj)/test \
 197                 --crate-name $(subst rusttest-,,$@) $<; \
 198         $(objtree)/$(obj)/test/$(subst rusttest-,,$@) $(rust_test_quiet) \
 199                 $(rustc_test_run_flags)
 200
 201 rusttest: rusttest-macros rusttest-kernel
 202
 203 rusttest-macros: private rustc_target_flags = --extern proc_macro \
 204         --extern macros --extern kernel
 205 rusttest-macros: private rustdoc_test_target_flags = --crate-type proc-macro
 206 rusttest-macros: $(src)/macros/lib.rs \
 207     rusttestlib-macros rusttestlib-kernel FORCE
 208         +$(call if_changed,rustc_test)
 209         +$(call if_changed,rustdoc_test)
 210
 211 rusttest-kernel: private rustc_target_flags = --extern ffi \
 212     --extern build_error --extern macros --extern bindings --extern uapi
 213 rusttest-kernel: $(src)/kernel/lib.rs rusttestlib-ffi rusttestlib-kernel \
 214     rusttestlib-build_error rusttestlib-macros rusttestlib-bindings \
 215     rusttestlib-uapi FORCE
 216         +$(call if_changed,rustc_test)
 217
 218 ifdef CONFIG_CC_IS_CLANG
 219 bindgen_c_flags = $(c_flags)
 220 else
 221 # bindgen relies on libclang to parse C. Ideally, bindgen would support a GCC
 222 # plugin backend and/or the Clang driver would be perfectly compatible with GCC.
 223 #
 224 # For the moment, here we are tweaking the flags on the fly. This is a hack,
 225 # and some kernel configurations may not work (e.g. `GCC_PLUGIN_RANDSTRUCT`
 226 # if we end up using one of those structs).
 227 bindgen_skip_c_flags := -mno-fp-ret-in-387 -mpreferred-stack-boundary=% \
 228         -mskip-rax-setup -mgeneral-regs-only -msign-return-address=% \
 229         -mindirect-branch=thunk-extern -mindirect-branch-register \
 230         -mfunction-return=thunk-extern -mrecord-mcount -mabi=lp64 \
 231         -mindirect-branch-cs-prefix -mstack-protector-guard% -mtraceback=no \
 232         -mno-pointers-to-nested-functions -mno-string \
 233         -mno-strict-align -mstrict-align \
 234         -fconserve-stack -falign-jumps=% -falign-loops=% \
 235         -femit-struct-debug-baseonly -fno-ipa-cp-clone -fno-ipa-sra \
 236         -fno-partial-inlining -fplugin-arg-arm_ssp_per_task_plugin-% \
 237         -fno-reorder-blocks -fno-allow-store-data-races -fasan-shadow-offset=% \
 238         -fzero-call-used-regs=% -fno-stack-clash-protection \
 239         -fno-inline-functions-called-once -fsanitize=bounds-strict \
 240         -fstrict-flex-arrays=% -fmin-function-alignment=% \
 241         --param=% --param asan-%
 242
 243 # Derived from `scripts/Makefile.clang`.
 244 BINDGEN_TARGET_x86      := x86_64-linux-gnu
 245 BINDGEN_TARGET_arm64    := aarch64-linux-gnu
 246 BINDGEN_TARGET          := $(BINDGEN_TARGET_$(SRCARCH))
 247
 248 # All warnings are inhibited since GCC builds are very experimental,
 249 # many GCC warnings are not supported by Clang, they may only appear in
 250 # some configurations, with new GCC versions, etc.
 251 bindgen_extra_c_flags = -w --target=$(BINDGEN_TARGET)
 252
 253 # Auto variable zero-initialization requires an additional special option with
 254 # clang that is going to be removed sometime in the future (likely in
 255 # clang-18), so make sure to pass this option only if clang supports it
 256 # (libclang major version < 16).
 257 #
 258 # https://github.com/llvm/llvm-project/issues/44842
 259 # https://github.com/llvm/llvm-project/blob/llvmorg-16.0.0-rc2/clang/docs/ReleaseNotes.rst#deprecated-compiler-flags
 260 ifdef CONFIG_INIT_STACK_ALL_ZERO
 261 libclang_maj_ver=$(shell $(BINDGEN) $(srctree)/scripts/rust_is_available_bindgen_libclang.h 2>&1 | sed -ne 's/.*clang version \([0-9]*\).*/\1/p')
 262 ifeq ($(shell expr $(libclang_maj_ver) \< 16), 1)
 263 bindgen_extra_c_flags += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
 264 endif
 265 endif
 266
 267 bindgen_c_flags = $(filter-out $(bindgen_skip_c_flags), $(c_flags)) \
 268         $(bindgen_extra_c_flags)
 269 endif
 270
 271 ifdef CONFIG_LTO
 272 bindgen_c_flags_lto = $(filter-out $(CC_FLAGS_LTO), $(bindgen_c_flags))
 273 else
 274 bindgen_c_flags_lto = $(bindgen_c_flags)
 275 endif
 276
 277 # `-fno-builtin` is passed to avoid `bindgen` from using `clang` builtin
 278 # prototypes for functions like `memcpy` -- if this flag is not passed,
 279 # `bindgen`-generated prototypes use `c_ulong` or `c_uint` depending on
 280 # architecture instead of generating `usize`.
 281 bindgen_c_flags_final = $(bindgen_c_flags_lto) -fno-builtin -D__BINDGEN__
 282
 283 # Each `bindgen` release may upgrade the list of Rust target versions. By
 284 # default, the highest stable release in their list is used. Thus we need to set
 285 # a `--rust-target` to avoid future `bindgen` releases emitting code that
 286 # `rustc` may not understand. On top of that, `bindgen` does not support passing
 287 # an unknown Rust target version.
 288 #
 289 # Therefore, the Rust target for `bindgen` can be only as high as the minimum
 290 # Rust version the kernel supports and only as high as the greatest stable Rust
 291 # target supported by the minimum `bindgen` version the kernel supports (that
 292 # is, if we do not test the actual `rustc`/`bindgen` versions running).
 293 #
 294 # Starting with `bindgen` 0.71.0, we will be able to set any future Rust version
 295 # instead, i.e. we will be able to set here our minimum supported Rust version.
 296 quiet_cmd_bindgen = BINDGEN $@
 297       cmd_bindgen = \
 298         $(BINDGEN) $< $(bindgen_target_flags) --rust-target 1.68 \
 299                 --use-core --with-derive-default --ctypes-prefix ffi --no-layout-tests \
 300                 --no-debug '.*' --enable-function-attribute-detection \
 301                 -o $@ -- $(bindgen_c_flags_final) -DMODULE \
 302                 $(bindgen_target_cflags) $(bindgen_target_extra)
 303
 304 $(obj)/bindings/bindings_generated.rs: private bindgen_target_flags = \
 305     $(shell grep -Ev '^#|^$$' $(src)/bindgen_parameters)
 306 $(obj)/bindings/bindings_generated.rs: private bindgen_target_extra = ; \
 307     sed -Ei 's/pub const RUST_CONST_HELPER_([a-zA-Z0-9_]*)/pub const \1/g' $@
 308 $(obj)/bindings/bindings_generated.rs: $(src)/bindings/bindings_helper.h \
 309     $(src)/bindgen_parameters FORCE
 310         $(call if_changed_dep,bindgen)
 311
 312 $(obj)/uapi/uapi_generated.rs: private bindgen_target_flags = \
 313     $(shell grep -Ev '^#|^$$' $(src)/bindgen_parameters)
 314 $(obj)/uapi/uapi_generated.rs: $(src)/uapi/uapi_helper.h \
 315     $(src)/bindgen_parameters FORCE
 316         $(call if_changed_dep,bindgen)
 317
 318 # See `CFLAGS_REMOVE_helpers.o` above. In addition, Clang on C does not warn
 319 # with `-Wmissing-declarations` (unlike GCC), so it is not strictly needed here
 320 # given it is `libclang`; but for consistency, future Clang changes and/or
 321 # a potential future GCC backend for `bindgen`, we disable it too.
 322 $(obj)/bindings/bindings_helpers_generated.rs: private bindgen_target_flags = \
 323     --blocklist-type '.*' --allowlist-var '' \
 324     --allowlist-function 'rust_helper_.*'
 325 $(obj)/bindings/bindings_helpers_generated.rs: private bindgen_target_cflags = \
 326     -I$(objtree)/$(obj) -Wno-missing-prototypes -Wno-missing-declarations
 327 $(obj)/bindings/bindings_helpers_generated.rs: private bindgen_target_extra = ; \
 328     sed -Ei 's/pub fn rust_helper_([a-zA-Z0-9_]*)/#[link_name="rust_helper_\1"]\n    pub fn \1/g' $@
 329 $(obj)/bindings/bindings_helpers_generated.rs: $(src)/helpers/helpers.c FORCE
 330         $(call if_changed_dep,bindgen)
 331
 332 quiet_cmd_exports = EXPORTS $@
 333       cmd_exports = \
 334         $(NM) -p --defined-only $< \
 335                 | awk '$$2~/(T|R|D|B)/ && $$3!~/__cfi/ {printf "EXPORT_SYMBOL_RUST_GPL(%s);\n",$$3}' > $@
 336
 337 $(obj)/exports_core_generated.h: $(obj)/core.o FORCE
 338         $(call if_changed,exports)
 339
 340 # Even though Rust kernel modules should never use the bindings directly,
 341 # symbols from the `bindings` crate and the C helpers need to be exported
 342 # because Rust generics and inlined functions may not get their code generated
 343 # in the crate where they are defined. Other helpers, called from non-inline
 344 # functions, may not be exported, in principle. However, in general, the Rust
 345 # compiler does not guarantee codegen will be performed for a non-inline
 346 # function either. Therefore, we export all symbols from helpers and bindings.
 347 # In the future, this may be revisited to reduce the number of exports after
 348 # the compiler is informed about the places codegen is required.
 349 $(obj)/exports_helpers_generated.h: $(obj)/helpers/helpers.o FORCE
 350         $(call if_changed,exports)
 351
 352 $(obj)/exports_bindings_generated.h: $(obj)/bindings.o FORCE
 353         $(call if_changed,exports)
 354
 355 $(obj)/exports_kernel_generated.h: $(obj)/kernel.o FORCE
 356         $(call if_changed,exports)
 357
 358 quiet_cmd_rustc_procmacro = $(RUSTC_OR_CLIPPY_QUIET) P $@
 359       cmd_rustc_procmacro = \
 360         $(RUSTC_OR_CLIPPY) $(rust_common_flags) \
 361                 -Clinker-flavor=gcc -Clinker=$(HOSTCC) \
 362                 -Clink-args='$(call escsq,$(KBUILD_HOSTLDFLAGS))' \
 363                 --emit=dep-info=$(depfile) --emit=link=$@ --extern proc_macro \
 364                 --crate-type proc-macro \
 365                 --crate-name $(patsubst lib%.so,%,$(notdir $@)) $<
 366
 367 # Procedural macros can only be used with the `rustc` that compiled it.
 368 $(obj)/libmacros.so: $(src)/macros/lib.rs FORCE
 369         +$(call if_changed_dep,rustc_procmacro)
 370
 371 quiet_cmd_rustc_library = $(if $(skip_clippy),RUSTC,$(RUSTC_OR_CLIPPY_QUIET)) L $@
 372       cmd_rustc_library = \
 373         OBJTREE=$(abspath $(objtree)) \
 374         $(if $(skip_clippy),$(RUSTC),$(RUSTC_OR_CLIPPY)) \
 375                 $(filter-out $(skip_flags),$(rust_flags) $(rustc_target_flags)) \
 376                 --emit=dep-info=$(depfile) --emit=obj=$@ \
 377                 --emit=metadata=$(dir $@)$(patsubst %.o,lib%.rmeta,$(notdir $@)) \
 378                 --crate-type rlib -L$(objtree)/$(obj) \
 379                 --crate-name $(patsubst %.o,%,$(notdir $@)) $< \
 380                 --sysroot=/dev/null \
 381         $(if $(rustc_objcopy),;$(OBJCOPY) $(rustc_objcopy) $@) \
 382         $(cmd_objtool)
 383
 384 rust-analyzer:
 385         $(Q)$(srctree)/scripts/generate_rust_analyzer.py \
 386                 --cfgs='core=$(core-cfgs)' \
 387                 $(realpath $(srctree)) $(realpath $(objtree)) \
 388                 $(rustc_sysroot) $(RUST_LIB_SRC) $(if $(KBUILD_EXTMOD),$(srcroot)) \
 389                 > rust-project.json
 390
 391 redirect-intrinsics = \
 392         __addsf3 __eqsf2 __extendsfdf2 __gesf2 __lesf2 __ltsf2 __mulsf3 __nesf2 __truncdfsf2 __unordsf2 \
 393         __adddf3 __eqdf2 __ledf2 __ltdf2 __muldf3 __unorddf2 \
 394         __muloti4 __multi3 \
 395         __udivmodti4 __udivti3 __umodti3
 396
 397 ifneq ($(or $(CONFIG_ARM64),$(and $(CONFIG_RISCV),$(CONFIG_64BIT))),)
 398         # These intrinsics are defined for ARM64 and RISCV64
 399         redirect-intrinsics += \
 400                 __ashrti3 \
 401                 __ashlti3 __lshrti3
 402 endif
 403
 404 define rule_rustc_library
 405         $(call cmd_and_fixdep,rustc_library)
 406         $(call cmd,gen_objtooldep)
 407 endef
 408
 409 $(obj)/core.o: private skip_clippy = 1
 410 $(obj)/core.o: private skip_flags = -Wunreachable_pub
 411 $(obj)/core.o: private rustc_objcopy = $(foreach sym,$(redirect-intrinsics),--redefine-sym $(sym)=__rust$(sym))
 412 $(obj)/core.o: private rustc_target_flags = $(core-cfgs)
 413 $(obj)/core.o: $(RUST_LIB_SRC)/core/src/lib.rs \
 414     $(wildcard $(objtree)/include/config/RUSTC_VERSION_TEXT) FORCE
 415         +$(call if_changed_rule,rustc_library)
 416 ifneq ($(or $(CONFIG_X86_64),$(CONFIG_X86_32)),)
 417 $(obj)/core.o: scripts/target.json
 418 endif
 419
 420 $(obj)/compiler_builtins.o: private rustc_objcopy = -w -W '__*'
 421 $(obj)/compiler_builtins.o: $(src)/compiler_builtins.rs $(obj)/core.o FORCE
 422         +$(call if_changed_rule,rustc_library)
 423
 424 $(obj)/build_error.o: $(src)/build_error.rs $(obj)/compiler_builtins.o FORCE
 425         +$(call if_changed_rule,rustc_library)
 426
 427 $(obj)/ffi.o: $(src)/ffi.rs $(obj)/compiler_builtins.o FORCE
 428         +$(call if_changed_rule,rustc_library)
 429
 430 $(obj)/bindings.o: private rustc_target_flags = --extern ffi
 431 $(obj)/bindings.o: $(src)/bindings/lib.rs \
 432     $(obj)/ffi.o \
 433     $(obj)/bindings/bindings_generated.rs \
 434     $(obj)/bindings/bindings_helpers_generated.rs FORCE
 435         +$(call if_changed_rule,rustc_library)
 436
 437 $(obj)/uapi.o: private rustc_target_flags = --extern ffi
 438 $(obj)/uapi.o: $(src)/uapi/lib.rs \
 439     $(obj)/ffi.o \
 440     $(obj)/uapi/uapi_generated.rs FORCE
 441         +$(call if_changed_rule,rustc_library)
 442
 443 $(obj)/kernel.o: private rustc_target_flags = --extern ffi \
 444     --extern build_error --extern macros --extern bindings --extern uapi
 445 $(obj)/kernel.o: $(src)/kernel/lib.rs $(obj)/build_error.o \
 446     $(obj)/libmacros.so $(obj)/bindings.o $(obj)/uapi.o FORCE
 447         +$(call if_changed_rule,rustc_library)
 448
 449 ifdef CONFIG_JUMP_LABEL
 450 $(obj)/kernel.o: $(obj)/kernel/generated_arch_static_branch_asm.rs
 451 endif
 452
 453 endif # CONFIG_RUST