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