1# SPDX-License-Identifier: GPL-2.0 2 3# Where to place rustdoc generated documentation 4rustdoc_output := $(objtree)/Documentation/output/rust/rustdoc 5 6obj-$(CONFIG_RUST) += core.o compiler_builtins.o ffi.o 7always-$(CONFIG_RUST) += exports_core_generated.h 8 9# Missing prototypes are expected in the helpers since these are exported 10# for Rust only, thus there is no header nor prototypes. 11obj-$(CONFIG_RUST) += helpers/helpers.o 12CFLAGS_REMOVE_helpers/helpers.o = -Wmissing-prototypes -Wmissing-declarations 13 14always-$(CONFIG_RUST) += bindings/bindings_generated.rs bindings/bindings_helpers_generated.rs 15obj-$(CONFIG_RUST) += bindings.o pin_init.o kernel.o 16always-$(CONFIG_RUST) += exports_helpers_generated.h \ 17 exports_bindings_generated.h exports_kernel_generated.h 18 19always-$(CONFIG_RUST) += uapi/uapi_generated.rs 20obj-$(CONFIG_RUST) += uapi.o 21 22ifdef CONFIG_RUST_BUILD_ASSERT_ALLOW 23obj-$(CONFIG_RUST) += build_error.o 24else 25always-$(CONFIG_RUST) += build_error.o 26endif 27 28obj-$(CONFIG_RUST) += exports.o 29 30always-$(CONFIG_RUST) += libproc_macro2.rlib libquote.rlib libsyn.rlib 31 32always-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated.rs 33always-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated_kunit.c 34 35obj-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated.o 36obj-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated_kunit.o 37 38always-$(subst y,$(CONFIG_RUST),$(CONFIG_JUMP_LABEL)) += kernel/generated_arch_static_branch_asm.rs 39ifndef CONFIG_UML 40always-$(subst y,$(CONFIG_RUST),$(CONFIG_BUG)) += kernel/generated_arch_warn_asm.rs kernel/generated_arch_reachable_asm.rs 41endif 42 43# Avoids running `$(RUSTC)` when it may not be available. 44ifdef CONFIG_RUST 45 46libmacros_name := $(shell MAKEFLAGS= $(RUSTC) --print file-names --crate-name macros --crate-type proc-macro - </dev/null) 47libmacros_extension := $(patsubst libmacros.%,%,$(libmacros_name)) 48 49libpin_init_internal_name := $(shell MAKEFLAGS= $(RUSTC) --print file-names --crate-name pin_init_internal --crate-type proc-macro - </dev/null) 50libpin_init_internal_extension := $(patsubst libpin_init_internal.%,%,$(libpin_init_internal_name)) 51 52always-$(CONFIG_RUST) += $(libmacros_name) $(libpin_init_internal_name) 53 54# `$(rust_flags)` is passed in case the user added `--sysroot`. 55rustc_sysroot := $(shell MAKEFLAGS= $(RUSTC) $(rust_flags) --print sysroot) 56rustc_host_target := $(shell $(RUSTC) --version --verbose | grep -F 'host: ' | cut -d' ' -f2) 57RUST_LIB_SRC ?= $(rustc_sysroot)/lib/rustlib/src/rust/library 58 59ifneq ($(quiet),) 60rust_test_quiet=-q 61rustdoc_test_quiet=--test-args -q 62rustdoc_test_kernel_quiet=>/dev/null 63endif 64 65cfgs-to-flags = $(patsubst %,--cfg='%',$1) 66 67core-cfgs := \ 68 no_fp_fmt_parse 69 70core-edition := $(if $(call rustc-min-version,108700),2024,2021) 71 72core-skip_flags := \ 73 --edition=2021 \ 74 -Wunreachable_pub \ 75 -Wrustdoc::unescaped_backticks 76 77core-flags := \ 78 --edition=$(core-edition) \ 79 $(call cfgs-to-flags,$(core-cfgs)) 80 81proc_macro2-cfgs := \ 82 feature="proc-macro" \ 83 wrap_proc_macro \ 84 $(if $(call rustc-min-version,108800),proc_macro_span_file proc_macro_span_location) 85 86# Stable since Rust 1.79.0: `feature(proc_macro_byte_character,proc_macro_c_str_literals)`. 87proc_macro2-flags := \ 88 --cap-lints=allow \ 89 -Zcrate-attr='feature(proc_macro_byte_character,proc_macro_c_str_literals)' \ 90 $(call cfgs-to-flags,$(proc_macro2-cfgs)) 91 92quote-cfgs := \ 93 feature="proc-macro" 94 95quote-skip_flags := \ 96 --edition=2021 97 98quote-flags := \ 99 --edition=2018 \ 100 --cap-lints=allow \ 101 --extern proc_macro2 \ 102 $(call cfgs-to-flags,$(quote-cfgs)) 103 104# `extra-traits`, `fold` and `visit` may be enabled if needed. 105syn-cfgs := \ 106 feature="clone-impls" \ 107 feature="derive" \ 108 feature="full" \ 109 feature="parsing" \ 110 feature="printing" \ 111 feature="proc-macro" \ 112 feature="visit-mut" 113 114syn-flags := \ 115 --cap-lints=allow \ 116 --extern proc_macro2 \ 117 --extern quote \ 118 $(call cfgs-to-flags,$(syn-cfgs)) 119 120pin_init_internal-cfgs := \ 121 kernel 122 123pin_init_internal-flags := \ 124 --extern proc_macro2 \ 125 --extern quote \ 126 --extern syn \ 127 $(call cfgs-to-flags,$(pin_init_internal-cfgs)) 128 129pin_init-cfgs := \ 130 kernel 131 132pin_init-flags := \ 133 --extern pin_init_internal \ 134 --extern macros \ 135 $(call cfgs-to-flags,$(pin_init-cfgs)) 136 137# `rustdoc` did not save the target modifiers, thus workaround for 138# the time being (https://github.com/rust-lang/rust/issues/144521). 139rustdoc_modifiers_workaround := $(if $(call rustc-min-version,108800),-Cunsafe-allow-abi-mismatch=fixed-x18) 140 141# Similarly, for doctests (https://github.com/rust-lang/rust/issues/146465). 142doctests_modifiers_workaround := $(rustdoc_modifiers_workaround)$(if $(call rustc-min-version,109100),$(comma)sanitizer) 143 144# `rustc` recognizes `--remap-path-prefix` since 1.26.0, but `rustdoc` only 145# since Rust 1.81.0. Moreover, `rustdoc` ICEs on out-of-tree builds since Rust 146# 1.82.0 (https://github.com/rust-lang/rust/issues/138520). Thus workaround both 147# issues skipping the flag. The former also applies to `RUSTDOC TK`. 148quiet_cmd_rustdoc = RUSTDOC $(if $(rustdoc_host),H, ) $< 149 cmd_rustdoc = \ 150 OBJTREE=$(abspath $(objtree)) \ 151 $(RUSTDOC) $(filter-out $(skip_flags) --remap-path-prefix=%,$(if $(rustdoc_host),$(rust_common_flags),$(rust_flags))) \ 152 $(rustc_target_flags) -L$(objtree)/$(obj) \ 153 -Zunstable-options --generate-link-to-definition \ 154 --output $(rustdoc_output) \ 155 --crate-name $(subst rustdoc-,,$@) \ 156 $(rustdoc_modifiers_workaround) \ 157 $(if $(rustdoc_host),,--sysroot=/dev/null) \ 158 @$(objtree)/include/generated/rustc_cfg $< 159 160# The `html_logo_url` and `html_favicon_url` forms of the `doc` attribute 161# can be used to specify a custom logo. However: 162# - The given value is used as-is, thus it cannot be relative or a local file 163# (unlike the non-custom case) since the generated docs have subfolders. 164# - It requires adding it to every crate. 165# - It requires changing `core` which comes from the sysroot. 166# 167# Using `-Zcrate-attr` would solve the last two points, but not the first. 168# The https://github.com/rust-lang/rfcs/pull/3226 RFC suggests two new 169# command-like flags to solve the issue. Meanwhile, we use the non-custom case 170# and then retouch the generated files. 171rustdoc: rustdoc-core rustdoc-macros rustdoc-compiler_builtins \ 172 rustdoc-kernel rustdoc-pin_init 173 $(Q)grep -Ehro '<a href="srctree/([^"]+)"' $(rustdoc_output) | \ 174 cut -d'"' -f2 | cut -d/ -f2- | while read f; do \ 175 if [ ! -e "$(srctree)/$$f" ]; then \ 176 echo "warning: srctree/ link to $$f does not exist"; \ 177 fi \ 178 done 179 $(Q)cp $(srctree)/Documentation/images/logo.svg $(rustdoc_output)/static.files/ 180 $(Q)cp $(srctree)/Documentation/images/COPYING-logo $(rustdoc_output)/static.files/ 181 $(Q)find $(rustdoc_output) -name '*.html' -type f -print0 | xargs -0 sed -Ei \ 182 -e 's:rust-logo-[0-9a-f]+\.svg:logo.svg:g' \ 183 -e 's:favicon-[0-9a-f]+\.svg:logo.svg:g' \ 184 -e 's:<link rel="alternate icon" type="image/png" href="[/.]+/static\.files/favicon-(16x16|32x32)-[0-9a-f]+\.png">::g' \ 185 -e 's:<a href="srctree/([^"]+)">:<a href="$(realpath $(srctree))/\1">:g' 186 $(Q)for f in $(rustdoc_output)/static.files/rustdoc-*.css; do \ 187 echo ".logo-container > img { object-fit: contain; }" >> $$f; done 188 189rustdoc-proc_macro2: private rustdoc_host = yes 190rustdoc-proc_macro2: private rustc_target_flags = $(proc_macro2-flags) 191rustdoc-proc_macro2: $(src)/proc-macro2/lib.rs rustdoc-clean FORCE 192 +$(call if_changed,rustdoc) 193 194rustdoc-quote: private rustdoc_host = yes 195rustdoc-quote: private rustc_target_flags = $(quote-flags) 196rustdoc-quote: private skip_flags = $(quote-skip_flags) 197rustdoc-quote: $(src)/quote/lib.rs rustdoc-clean rustdoc-proc_macro2 FORCE 198 +$(call if_changed,rustdoc) 199 200rustdoc-syn: private rustdoc_host = yes 201rustdoc-syn: private rustc_target_flags = $(syn-flags) 202rustdoc-syn: $(src)/syn/lib.rs rustdoc-clean rustdoc-quote FORCE 203 +$(call if_changed,rustdoc) 204 205rustdoc-macros: private rustdoc_host = yes 206rustdoc-macros: private rustc_target_flags = --crate-type proc-macro \ 207 --extern proc_macro --extern proc_macro2 --extern quote --extern syn 208rustdoc-macros: $(src)/macros/lib.rs rustdoc-clean rustdoc-proc_macro2 \ 209 rustdoc-quote rustdoc-syn FORCE 210 +$(call if_changed,rustdoc) 211 212# Starting with Rust 1.82.0, skipping `-Wrustdoc::unescaped_backticks` should 213# not be needed -- see https://github.com/rust-lang/rust/pull/128307. 214rustdoc-core: private skip_flags = $(core-skip_flags) 215rustdoc-core: private rustc_target_flags = $(core-flags) 216rustdoc-core: $(RUST_LIB_SRC)/core/src/lib.rs rustdoc-clean FORCE 217 +$(call if_changed,rustdoc) 218 219# Even if `rustdoc` targets are not kernel objects, they should still be 220# treated as such so that we pass the same flags. Otherwise, for instance, 221# `rustdoc` will complain about missing sanitizer flags causing an ABI mismatch. 222rustdoc-compiler_builtins: private is-kernel-object := y 223rustdoc-compiler_builtins: $(src)/compiler_builtins.rs rustdoc-core FORCE 224 +$(call if_changed,rustdoc) 225 226rustdoc-ffi: private is-kernel-object := y 227rustdoc-ffi: $(src)/ffi.rs rustdoc-core FORCE 228 +$(call if_changed,rustdoc) 229 230rustdoc-pin_init_internal: private rustdoc_host = yes 231rustdoc-pin_init_internal: private rustc_target_flags = $(pin_init_internal-flags) \ 232 --extern proc_macro --crate-type proc-macro 233rustdoc-pin_init_internal: $(src)/pin-init/internal/src/lib.rs \ 234 rustdoc-clean rustdoc-proc_macro2 rustdoc-quote rustdoc-syn FORCE 235 +$(call if_changed,rustdoc) 236 237rustdoc-pin_init: private rustdoc_host = yes 238rustdoc-pin_init: private rustc_target_flags = $(pin_init-flags) \ 239 --extern alloc --cfg feature=\"alloc\" 240rustdoc-pin_init: $(src)/pin-init/src/lib.rs rustdoc-pin_init_internal \ 241 rustdoc-macros FORCE 242 +$(call if_changed,rustdoc) 243 244rustdoc-kernel: private is-kernel-object := y 245rustdoc-kernel: private rustc_target_flags = --extern ffi --extern pin_init \ 246 --extern build_error --extern macros \ 247 --extern bindings --extern uapi 248rustdoc-kernel: $(src)/kernel/lib.rs rustdoc-core rustdoc-ffi rustdoc-macros \ 249 rustdoc-pin_init rustdoc-compiler_builtins $(obj)/$(libmacros_name) \ 250 $(obj)/bindings.o FORCE 251 +$(call if_changed,rustdoc) 252 253rustdoc-clean: FORCE 254 $(Q)rm -rf $(rustdoc_output) 255 256quiet_cmd_rustc_test_library = $(RUSTC_OR_CLIPPY_QUIET) TL $< 257 cmd_rustc_test_library = \ 258 OBJTREE=$(abspath $(objtree)) \ 259 $(RUSTC_OR_CLIPPY) $(filter-out $(skip_flags),$(rust_common_flags) $(rustc_target_flags)) \ 260 @$(objtree)/include/generated/rustc_cfg \ 261 --crate-type $(if $(rustc_test_library_proc),proc-macro,rlib) \ 262 --out-dir $(objtree)/$(obj)/test --cfg testlib \ 263 -L$(objtree)/$(obj)/test \ 264 --crate-name $(subst rusttest-,,$(subst rusttestlib-,,$@)) $< 265 266rusttestlib-build_error: $(src)/build_error.rs FORCE 267 +$(call if_changed,rustc_test_library) 268 269rusttestlib-ffi: $(src)/ffi.rs FORCE 270 +$(call if_changed,rustc_test_library) 271 272rusttestlib-proc_macro2: private rustc_target_flags = $(proc_macro2-flags) 273rusttestlib-proc_macro2: $(src)/proc-macro2/lib.rs FORCE 274 +$(call if_changed,rustc_test_library) 275 276rusttestlib-quote: private skip_flags = $(quote-skip_flags) 277rusttestlib-quote: private rustc_target_flags = $(quote-flags) 278rusttestlib-quote: $(src)/quote/lib.rs rusttestlib-proc_macro2 FORCE 279 +$(call if_changed,rustc_test_library) 280 281rusttestlib-syn: private rustc_target_flags = $(syn-flags) 282rusttestlib-syn: $(src)/syn/lib.rs rusttestlib-quote FORCE 283 +$(call if_changed,rustc_test_library) 284 285rusttestlib-macros: private rustc_target_flags = --extern proc_macro \ 286 --extern proc_macro2 --extern quote --extern syn 287rusttestlib-macros: private rustc_test_library_proc = yes 288rusttestlib-macros: $(src)/macros/lib.rs \ 289 rusttestlib-proc_macro2 rusttestlib-quote rusttestlib-syn FORCE 290 +$(call if_changed,rustc_test_library) 291 292rusttestlib-pin_init_internal: private rustc_target_flags = $(pin_init_internal-flags) \ 293 --extern proc_macro 294rusttestlib-pin_init_internal: private rustc_test_library_proc = yes 295rusttestlib-pin_init_internal: $(src)/pin-init/internal/src/lib.rs \ 296 rusttestlib-proc_macro2 rusttestlib-quote rusttestlib-syn FORCE 297 +$(call if_changed,rustc_test_library) 298 299rusttestlib-pin_init: private rustc_target_flags = $(pin_init-flags) 300rusttestlib-pin_init: $(src)/pin-init/src/lib.rs rusttestlib-macros \ 301 rusttestlib-pin_init_internal $(obj)/$(libpin_init_internal_name) FORCE 302 +$(call if_changed,rustc_test_library) 303 304rusttestlib-kernel: private rustc_target_flags = --extern ffi \ 305 --extern build_error --extern macros --extern pin_init \ 306 --extern bindings --extern uapi 307rusttestlib-kernel: $(src)/kernel/lib.rs rusttestlib-bindings rusttestlib-uapi \ 308 rusttestlib-build_error rusttestlib-pin_init $(obj)/$(libmacros_name) \ 309 $(obj)/bindings.o FORCE 310 +$(call if_changed,rustc_test_library) 311 312rusttestlib-bindings: private rustc_target_flags = --extern ffi --extern pin_init 313rusttestlib-bindings: $(src)/bindings/lib.rs rusttestlib-ffi rusttestlib-pin_init FORCE 314 +$(call if_changed,rustc_test_library) 315 316rusttestlib-uapi: private rustc_target_flags = --extern ffi --extern pin_init 317rusttestlib-uapi: $(src)/uapi/lib.rs rusttestlib-ffi rusttestlib-pin_init FORCE 318 +$(call if_changed,rustc_test_library) 319 320quiet_cmd_rustdoc_test = RUSTDOC T $< 321 cmd_rustdoc_test = \ 322 RUST_MODFILE=test.rs \ 323 OBJTREE=$(abspath $(objtree)) \ 324 $(RUSTDOC) --test $(rust_common_flags) \ 325 -Zcrate-attr='feature(used_with_arg)' \ 326 @$(objtree)/include/generated/rustc_cfg \ 327 $(rustc_target_flags) $(rustdoc_test_target_flags) \ 328 $(rustdoc_test_quiet) \ 329 -L$(objtree)/$(obj)/test --output $(rustdoc_output) \ 330 --crate-name $(subst rusttest-,,$@) $< 331 332quiet_cmd_rustdoc_test_kernel = RUSTDOC TK $< 333 cmd_rustdoc_test_kernel = \ 334 rm -rf $(objtree)/$(obj)/test/doctests/kernel; \ 335 mkdir -p $(objtree)/$(obj)/test/doctests/kernel; \ 336 OBJTREE=$(abspath $(objtree)) \ 337 $(RUSTDOC) --test $(filter-out --remap-path-prefix=%,$(rust_flags)) \ 338 -L$(objtree)/$(obj) --extern ffi --extern pin_init \ 339 --extern kernel --extern build_error --extern macros \ 340 --extern bindings --extern uapi \ 341 --no-run --crate-name kernel -Zunstable-options \ 342 --sysroot=/dev/null \ 343 $(doctests_modifiers_workaround) \ 344 --test-builder $(objtree)/scripts/rustdoc_test_builder \ 345 $< $(rustdoc_test_kernel_quiet); \ 346 $(objtree)/scripts/rustdoc_test_gen 347 348%/doctests_kernel_generated.rs %/doctests_kernel_generated_kunit.c: \ 349 $(src)/kernel/lib.rs $(obj)/kernel.o \ 350 $(objtree)/scripts/rustdoc_test_builder \ 351 $(objtree)/scripts/rustdoc_test_gen FORCE 352 +$(call if_changed,rustdoc_test_kernel) 353 354# We cannot use `-Zpanic-abort-tests` because some tests are dynamic, 355# so for the moment we skip `-Cpanic=abort`. 356quiet_cmd_rustc_test = $(RUSTC_OR_CLIPPY_QUIET) T $< 357 cmd_rustc_test = \ 358 OBJTREE=$(abspath $(objtree)) \ 359 $(RUSTC_OR_CLIPPY) --test $(rust_common_flags) \ 360 @$(objtree)/include/generated/rustc_cfg \ 361 $(rustc_target_flags) --out-dir $(objtree)/$(obj)/test \ 362 -L$(objtree)/$(obj)/test \ 363 --crate-name $(subst rusttest-,,$@) $<; \ 364 $(objtree)/$(obj)/test/$(subst rusttest-,,$@) $(rust_test_quiet) \ 365 $(rustc_test_run_flags) 366 367rusttest: rusttest-macros 368 369rusttest-macros: private rustc_target_flags = --extern proc_macro \ 370 --extern macros --extern kernel --extern pin_init \ 371 --extern proc_macro2 --extern quote --extern syn 372rusttest-macros: private rustdoc_test_target_flags = --crate-type proc-macro 373rusttest-macros: $(src)/macros/lib.rs \ 374 rusttestlib-macros rusttestlib-kernel rusttestlib-pin_init FORCE 375 +$(call if_changed,rustc_test) 376 +$(call if_changed,rustdoc_test) 377 378ifdef CONFIG_CC_IS_CLANG 379bindgen_c_flags = $(c_flags) 380else 381# bindgen relies on libclang to parse C. Ideally, bindgen would support a GCC 382# plugin backend and/or the Clang driver would be perfectly compatible with GCC. 383# 384# For the moment, here we are tweaking the flags on the fly. This is a hack, 385# and some kernel configurations may not work (e.g. `GCC_PLUGIN_RANDSTRUCT` 386# if we end up using one of those structs). 387bindgen_skip_c_flags := -mno-fp-ret-in-387 -mpreferred-stack-boundary=% \ 388 -mskip-rax-setup -mgeneral-regs-only -msign-return-address=% \ 389 -mindirect-branch=thunk-extern -mindirect-branch-register \ 390 -mfunction-return=thunk-extern -mrecord-mcount -mabi=lp64 \ 391 -mindirect-branch-cs-prefix -mstack-protector-guard% -mtraceback=no \ 392 -mno-pointers-to-nested-functions -mno-string \ 393 -mno-strict-align -mstrict-align -mdirect-extern-access \ 394 -mexplicit-relocs -mno-check-zero-division \ 395 -fconserve-stack -falign-jumps=% -falign-loops=% \ 396 -femit-struct-debug-baseonly -fno-ipa-cp-clone -fno-ipa-sra \ 397 -fno-partial-inlining -fplugin-arg-arm_ssp_per_task_plugin-% \ 398 -fno-reorder-blocks -fno-allow-store-data-races -fasan-shadow-offset=% \ 399 -fzero-call-used-regs=% -fno-stack-clash-protection \ 400 -fno-inline-functions-called-once -fsanitize=bounds-strict \ 401 -fstrict-flex-arrays=% -fmin-function-alignment=% \ 402 -fzero-init-padding-bits=% -mno-fdpic \ 403 --param=% --param asan-% -fno-isolate-erroneous-paths-dereference 404 405# Derived from `scripts/Makefile.clang`. 406BINDGEN_TARGET_x86 := x86_64-linux-gnu 407BINDGEN_TARGET_arm64 := aarch64-linux-gnu 408BINDGEN_TARGET_arm := arm-linux-gnueabi 409BINDGEN_TARGET_loongarch := loongarch64-linux-gnusf 410BINDGEN_TARGET_um := $(BINDGEN_TARGET_$(SUBARCH)) 411BINDGEN_TARGET := $(BINDGEN_TARGET_$(SRCARCH)) 412 413# All warnings are inhibited since GCC builds are very experimental, 414# many GCC warnings are not supported by Clang, they may only appear in 415# some configurations, with new GCC versions, etc. 416bindgen_extra_c_flags = -w --target=$(BINDGEN_TARGET) 417 418# Auto variable zero-initialization requires an additional special option with 419# clang that is going to be removed sometime in the future (likely in 420# clang-18), so make sure to pass this option only if clang supports it 421# (libclang major version < 16). 422# 423# https://github.com/llvm/llvm-project/issues/44842 424# https://github.com/llvm/llvm-project/blob/llvmorg-16.0.0-rc2/clang/docs/ReleaseNotes.rst#deprecated-compiler-flags 425ifdef CONFIG_INIT_STACK_ALL_ZERO 426libclang_maj_ver=$(shell $(BINDGEN) $(srctree)/scripts/rust_is_available_bindgen_libclang.h 2>&1 | sed -ne 's/.*clang version \([0-9]*\).*/\1/p') 427ifeq ($(shell expr $(libclang_maj_ver) \< 16), 1) 428bindgen_extra_c_flags += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 429endif 430endif 431 432bindgen_c_flags = $(filter-out $(bindgen_skip_c_flags), $(c_flags)) \ 433 $(bindgen_extra_c_flags) 434endif 435 436ifdef CONFIG_LTO 437bindgen_c_flags_lto = $(filter-out $(CC_FLAGS_LTO), $(bindgen_c_flags)) 438else 439bindgen_c_flags_lto = $(bindgen_c_flags) 440endif 441 442# `-fno-builtin` is passed to avoid `bindgen` from using `clang` builtin 443# prototypes for functions like `memcpy` -- if this flag is not passed, 444# `bindgen`-generated prototypes use `c_ulong` or `c_uint` depending on 445# architecture instead of generating `usize`. 446bindgen_c_flags_final = $(bindgen_c_flags_lto) -fno-builtin -D__BINDGEN__ 447 448# Each `bindgen` release may upgrade the list of Rust target versions. By 449# default, the highest stable release in their list is used. Thus we need to set 450# a `--rust-target` to avoid future `bindgen` releases emitting code that 451# `rustc` may not understand. On top of that, `bindgen` does not support passing 452# an unknown Rust target version. 453# 454# Therefore, the Rust target for `bindgen` can be only as high as the minimum 455# Rust version the kernel supports and only as high as the greatest stable Rust 456# target supported by the minimum `bindgen` version the kernel supports (that 457# is, if we do not test the actual `rustc`/`bindgen` versions running). 458# 459# Starting with `bindgen` 0.71.0, we will be able to set any future Rust version 460# instead, i.e. we will be able to set here our minimum supported Rust version. 461quiet_cmd_bindgen = BINDGEN $@ 462 cmd_bindgen = \ 463 $(BINDGEN) $< $(bindgen_target_flags) --rust-target 1.68 \ 464 --use-core --with-derive-default --ctypes-prefix ffi --no-layout-tests \ 465 --no-debug '.*' --enable-function-attribute-detection \ 466 -o $@ -- $(bindgen_c_flags_final) -DMODULE \ 467 $(bindgen_target_cflags) $(bindgen_target_extra) 468 469$(obj)/bindings/bindings_generated.rs: private bindgen_target_flags = \ 470 $(shell grep -Ev '^#|^$$' $(src)/bindgen_parameters) 471$(obj)/bindings/bindings_generated.rs: private bindgen_target_extra = ; \ 472 sed -Ei 's/pub const RUST_CONST_HELPER_([a-zA-Z0-9_]*)/pub const \1/g' $@ 473$(obj)/bindings/bindings_generated.rs: $(src)/bindings/bindings_helper.h \ 474 $(src)/bindgen_parameters FORCE 475 $(call if_changed_dep,bindgen) 476 477$(obj)/uapi/uapi_generated.rs: private bindgen_target_flags = \ 478 $(shell grep -Ev '^#|^$$' $(src)/bindgen_parameters) 479$(obj)/uapi/uapi_generated.rs: $(src)/uapi/uapi_helper.h \ 480 $(src)/bindgen_parameters FORCE 481 $(call if_changed_dep,bindgen) 482 483# See `CFLAGS_REMOVE_helpers.o` above. In addition, Clang on C does not warn 484# with `-Wmissing-declarations` (unlike GCC), so it is not strictly needed here 485# given it is `libclang`; but for consistency, future Clang changes and/or 486# a potential future GCC backend for `bindgen`, we disable it too. 487$(obj)/bindings/bindings_helpers_generated.rs: private bindgen_target_flags = \ 488 --blocklist-type '.*' --allowlist-var '' \ 489 --allowlist-function 'rust_helper_.*' 490$(obj)/bindings/bindings_helpers_generated.rs: private bindgen_target_cflags = \ 491 -I$(objtree)/$(obj) -Wno-missing-prototypes -Wno-missing-declarations 492$(obj)/bindings/bindings_helpers_generated.rs: private bindgen_target_extra = ; \ 493 sed -Ei 's/pub fn rust_helper_([a-zA-Z0-9_]*)/#[link_name="rust_helper_\1"]\n pub fn \1/g' $@ 494$(obj)/bindings/bindings_helpers_generated.rs: $(src)/helpers/helpers.c FORCE 495 $(call if_changed_dep,bindgen) 496 497rust_exports = $(NM) -p --defined-only $(1) | awk '$$2~/(T|R|D|B)/ && $$3!~/__(pfx|cfi|odr_asan)/ { printf $(2),$$3 }' 498 499quiet_cmd_exports = EXPORTS $@ 500 cmd_exports = \ 501 $(call rust_exports,$<,"EXPORT_SYMBOL_RUST_GPL(%s);\n") > $@ 502 503$(obj)/exports_core_generated.h: $(obj)/core.o FORCE 504 $(call if_changed,exports) 505 506# Even though Rust kernel modules should never use the bindings directly, 507# symbols from the `bindings` crate and the C helpers need to be exported 508# because Rust generics and inlined functions may not get their code generated 509# in the crate where they are defined. Other helpers, called from non-inline 510# functions, may not be exported, in principle. However, in general, the Rust 511# compiler does not guarantee codegen will be performed for a non-inline 512# function either. Therefore, we export all symbols from helpers and bindings. 513# In the future, this may be revisited to reduce the number of exports after 514# the compiler is informed about the places codegen is required. 515$(obj)/exports_helpers_generated.h: $(obj)/helpers/helpers.o FORCE 516 $(call if_changed,exports) 517 518$(obj)/exports_bindings_generated.h: $(obj)/bindings.o FORCE 519 $(call if_changed,exports) 520 521$(obj)/exports_kernel_generated.h: $(obj)/kernel.o FORCE 522 $(call if_changed,exports) 523 524quiet_cmd_rustc_procmacrolibrary = $(RUSTC_OR_CLIPPY_QUIET) PL $@ 525 cmd_rustc_procmacrolibrary = \ 526 $(if $(skip_clippy),$(RUSTC),$(RUSTC_OR_CLIPPY)) \ 527 $(filter-out $(skip_flags),$(rust_common_flags) $(rustc_target_flags)) \ 528 --emit=dep-info,link --crate-type rlib -O \ 529 --out-dir $(objtree)/$(obj) -L$(objtree)/$(obj) \ 530 --crate-name $(patsubst lib%.rlib,%,$(notdir $@)) $<; \ 531 mv $(objtree)/$(obj)/$(patsubst lib%.rlib,%,$(notdir $@)).d $(depfile); \ 532 sed -i '/^\#/d' $(depfile) 533 534$(obj)/libproc_macro2.rlib: private skip_clippy = 1 535$(obj)/libproc_macro2.rlib: private rustc_target_flags = $(proc_macro2-flags) 536$(obj)/libproc_macro2.rlib: $(src)/proc-macro2/lib.rs FORCE 537 +$(call if_changed_dep,rustc_procmacrolibrary) 538 539$(obj)/libquote.rlib: private skip_clippy = 1 540$(obj)/libquote.rlib: private skip_flags = $(quote-skip_flags) 541$(obj)/libquote.rlib: private rustc_target_flags = $(quote-flags) 542$(obj)/libquote.rlib: $(src)/quote/lib.rs $(obj)/libproc_macro2.rlib FORCE 543 +$(call if_changed_dep,rustc_procmacrolibrary) 544 545$(obj)/libsyn.rlib: private skip_clippy = 1 546$(obj)/libsyn.rlib: private rustc_target_flags = $(syn-flags) 547$(obj)/libsyn.rlib: $(src)/syn/lib.rs $(obj)/libquote.rlib FORCE 548 +$(call if_changed_dep,rustc_procmacrolibrary) 549 550quiet_cmd_rustc_procmacro = $(RUSTC_OR_CLIPPY_QUIET) P $@ 551 cmd_rustc_procmacro = \ 552 $(RUSTC_OR_CLIPPY) $(rust_common_flags) $(rustc_target_flags) \ 553 -Clinker-flavor=gcc -Clinker=$(HOSTCC) \ 554 -Clink-args='$(call escsq,$(KBUILD_PROCMACROLDFLAGS))' \ 555 --emit=dep-info=$(depfile) --emit=link=$@ --extern proc_macro \ 556 --crate-type proc-macro -L$(objtree)/$(obj) \ 557 --crate-name $(patsubst lib%.$(libmacros_extension),%,$(notdir $@)) \ 558 @$(objtree)/include/generated/rustc_cfg $< 559 560# Procedural macros can only be used with the `rustc` that compiled it. 561$(obj)/$(libmacros_name): private rustc_target_flags = \ 562 --extern proc_macro2 --extern quote --extern syn 563$(obj)/$(libmacros_name): $(src)/macros/lib.rs $(obj)/libproc_macro2.rlib \ 564 $(obj)/libquote.rlib $(obj)/libsyn.rlib FORCE 565 +$(call if_changed_dep,rustc_procmacro) 566 567$(obj)/$(libpin_init_internal_name): private rustc_target_flags = $(pin_init_internal-flags) 568$(obj)/$(libpin_init_internal_name): $(src)/pin-init/internal/src/lib.rs \ 569 $(obj)/libproc_macro2.rlib $(obj)/libquote.rlib $(obj)/libsyn.rlib FORCE 570 +$(call if_changed_dep,rustc_procmacro) 571 572quiet_cmd_rustc_library = $(if $(skip_clippy),RUSTC,$(RUSTC_OR_CLIPPY_QUIET)) L $@ 573 cmd_rustc_library = \ 574 OBJTREE=$(abspath $(objtree)) \ 575 $(if $(skip_clippy),$(RUSTC),$(RUSTC_OR_CLIPPY)) \ 576 $(filter-out $(skip_flags),$(rust_flags)) $(rustc_target_flags) \ 577 --emit=dep-info=$(depfile) --emit=obj=$@ \ 578 --emit=metadata=$(dir $@)$(patsubst %.o,lib%.rmeta,$(notdir $@)) \ 579 --crate-type rlib -L$(objtree)/$(obj) \ 580 --crate-name $(patsubst %.o,%,$(notdir $@)) $< \ 581 --sysroot=/dev/null \ 582 $(if $(rustc_objcopy),;$(OBJCOPY) $(rustc_objcopy) $@) \ 583 $(cmd_objtool) 584 585rust-analyzer: 586 $(Q)MAKEFLAGS= $(srctree)/scripts/generate_rust_analyzer.py \ 587 --cfgs='core=$(core-cfgs)' $(core-edition) \ 588 --cfgs='proc_macro2=$(proc_macro2-cfgs)' \ 589 --cfgs='quote=$(quote-cfgs)' \ 590 --cfgs='syn=$(syn-cfgs)' \ 591 $(realpath $(srctree)) $(realpath $(objtree)) \ 592 $(rustc_sysroot) $(RUST_LIB_SRC) $(if $(KBUILD_EXTMOD),$(srcroot)) \ 593 > rust-project.json 594 595redirect-intrinsics = \ 596 __addsf3 __eqsf2 __extendsfdf2 __gesf2 __lesf2 __ltsf2 __mulsf3 __nesf2 __truncdfsf2 __unordsf2 \ 597 __adddf3 __eqdf2 __ledf2 __ltdf2 __muldf3 __unorddf2 \ 598 __muloti4 __multi3 \ 599 __udivmodti4 __udivti3 __umodti3 600 601ifdef CONFIG_ARM 602 # Add eabi initrinsics for ARM 32-bit 603 redirect-intrinsics += \ 604 __aeabi_fadd __aeabi_fmul __aeabi_fcmpeq __aeabi_fcmple __aeabi_fcmplt __aeabi_fcmpun \ 605 __aeabi_dadd __aeabi_dmul __aeabi_dcmple __aeabi_dcmplt __aeabi_dcmpun \ 606 __aeabi_uldivmod 607endif 608ifneq ($(or $(CONFIG_ARM64),$(and $(CONFIG_RISCV),$(CONFIG_64BIT))),) 609 # These intrinsics are defined for ARM64 and RISCV64 610 redirect-intrinsics += \ 611 __ashrti3 \ 612 __ashlti3 __lshrti3 613endif 614 615ifdef CONFIG_MODVERSIONS 616cmd_gendwarfksyms = $(if $(skip_gendwarfksyms),, \ 617 $(call rust_exports,$@,"%s\n") | \ 618 scripts/gendwarfksyms/gendwarfksyms \ 619 $(if $(KBUILD_GENDWARFKSYMS_STABLE), --stable) \ 620 $(if $(KBUILD_SYMTYPES), --symtypes $(@:.o=.symtypes),) \ 621 $@ >> $(dot-target).cmd) 622endif 623 624define rule_rustc_library 625 $(call cmd_and_fixdep,rustc_library) 626 $(call cmd,gen_objtooldep) 627 $(call cmd,gendwarfksyms) 628endef 629 630define rule_rust_cc_library 631 $(call if_changed_rule,cc_o_c) 632 $(call cmd,force_checksrc) 633 $(call cmd,gendwarfksyms) 634endef 635 636# helpers.o uses the same export mechanism as Rust libraries, so ensure symbol 637# versions are calculated for the helpers too. 638$(obj)/helpers/helpers.o: $(src)/helpers/helpers.c $(recordmcount_source) FORCE 639 +$(call if_changed_rule,rust_cc_library) 640 641# Disable symbol versioning for exports.o to avoid conflicts with the actual 642# symbol versions generated from Rust objects. 643$(obj)/exports.o: private skip_gendwarfksyms = 1 644 645$(obj)/core.o: private skip_clippy = 1 646$(obj)/core.o: private skip_flags = $(core-skip_flags) 647$(obj)/core.o: private rustc_objcopy = $(foreach sym,$(redirect-intrinsics),--redefine-sym $(sym)=__rust$(sym)) 648$(obj)/core.o: private rustc_target_flags = $(core-flags) 649$(obj)/core.o: $(RUST_LIB_SRC)/core/src/lib.rs \ 650 $(wildcard $(objtree)/include/config/RUSTC_VERSION_TEXT) FORCE 651 +$(call if_changed_rule,rustc_library) 652ifneq ($(or $(CONFIG_X86_64),$(CONFIG_X86_32)),) 653$(obj)/core.o: scripts/target.json 654endif 655KCOV_INSTRUMENT_core.o := n 656 657$(obj)/compiler_builtins.o: private skip_gendwarfksyms = 1 658$(obj)/compiler_builtins.o: private rustc_objcopy = -w -W '__*' 659$(obj)/compiler_builtins.o: $(src)/compiler_builtins.rs $(obj)/core.o FORCE 660 +$(call if_changed_rule,rustc_library) 661 662$(obj)/pin_init.o: private skip_gendwarfksyms = 1 663$(obj)/pin_init.o: private rustc_target_flags = $(pin_init-flags) 664$(obj)/pin_init.o: $(src)/pin-init/src/lib.rs $(obj)/compiler_builtins.o \ 665 $(obj)/$(libpin_init_internal_name) $(obj)/$(libmacros_name) FORCE 666 +$(call if_changed_rule,rustc_library) 667 668# Even if normally `build_error` is not a kernel object, it should still be 669# treated as such so that we pass the same flags. Otherwise, for instance, 670# `rustc` will complain about missing sanitizer flags causing an ABI mismatch. 671$(obj)/build_error.o: private is-kernel-object := y 672$(obj)/build_error.o: private skip_gendwarfksyms = 1 673$(obj)/build_error.o: $(src)/build_error.rs $(obj)/compiler_builtins.o FORCE 674 +$(call if_changed_rule,rustc_library) 675 676$(obj)/ffi.o: private skip_gendwarfksyms = 1 677$(obj)/ffi.o: $(src)/ffi.rs $(obj)/compiler_builtins.o FORCE 678 +$(call if_changed_rule,rustc_library) 679 680$(obj)/bindings.o: private rustc_target_flags = --extern ffi --extern pin_init 681$(obj)/bindings.o: $(src)/bindings/lib.rs \ 682 $(obj)/ffi.o \ 683 $(obj)/pin_init.o \ 684 $(obj)/bindings/bindings_generated.rs \ 685 $(obj)/bindings/bindings_helpers_generated.rs FORCE 686 +$(call if_changed_rule,rustc_library) 687 688$(obj)/uapi.o: private rustc_target_flags = --extern ffi --extern pin_init 689$(obj)/uapi.o: private skip_gendwarfksyms = 1 690$(obj)/uapi.o: $(src)/uapi/lib.rs \ 691 $(obj)/ffi.o \ 692 $(obj)/pin_init.o \ 693 $(obj)/uapi/uapi_generated.rs FORCE 694 +$(call if_changed_rule,rustc_library) 695 696$(obj)/kernel.o: private rustc_target_flags = --extern ffi --extern pin_init \ 697 --extern build_error --extern macros --extern bindings --extern uapi 698$(obj)/kernel.o: $(src)/kernel/lib.rs $(obj)/build_error.o $(obj)/pin_init.o \ 699 $(obj)/$(libmacros_name) $(obj)/bindings.o $(obj)/uapi.o FORCE 700 +$(call if_changed_rule,rustc_library) 701 702ifdef CONFIG_JUMP_LABEL 703$(obj)/kernel.o: $(obj)/kernel/generated_arch_static_branch_asm.rs 704endif 705ifndef CONFIG_UML 706ifdef CONFIG_BUG 707$(obj)/kernel.o: $(obj)/kernel/generated_arch_warn_asm.rs $(obj)/kernel/generated_arch_reachable_asm.rs 708endif 709endif 710 711endif # CONFIG_RUST 712
