tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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=% --remap-path-scope=%, \
152 $(if $(rustdoc_host),$(rust_common_flags),$(rust_flags))) \
153 $(rustc_target_flags) -L$(objtree)/$(obj) \
154 -Zunstable-options --generate-link-to-definition \
155 --output $(rustdoc_output) \
156 --crate-name $(subst rustdoc-,,$@) \
157 $(rustdoc_modifiers_workaround) \
158 $(if $(rustdoc_host),,--sysroot=/dev/null) \
159 @$(objtree)/include/generated/rustc_cfg $<
160
161# The `html_logo_url` and `html_favicon_url` forms of the `doc` attribute
162# can be used to specify a custom logo. However:
163# - The given value is used as-is, thus it cannot be relative or a local file
164# (unlike the non-custom case) since the generated docs have subfolders.
165# - It requires adding it to every crate.
166# - It requires changing `core` which comes from the sysroot.
167#
168# Using `-Zcrate-attr` would solve the last two points, but not the first.
169# The https://github.com/rust-lang/rfcs/pull/3226 RFC suggests two new
170# command-like flags to solve the issue. Meanwhile, we use the non-custom case
171# and then retouch the generated files.
172rustdoc: rustdoc-core rustdoc-macros rustdoc-compiler_builtins \
173 rustdoc-kernel rustdoc-pin_init
174 $(Q)grep -Ehro '<a href="srctree/([^"]+)"' $(rustdoc_output) | \
175 cut -d'"' -f2 | cut -d/ -f2- | while read f; do \
176 if [ ! -e "$(srctree)/$$f" ]; then \
177 echo "warning: srctree/ link to $$f does not exist"; \
178 fi \
179 done
180 $(Q)cp $(srctree)/Documentation/images/logo.svg $(rustdoc_output)/static.files/
181 $(Q)cp $(srctree)/Documentation/images/COPYING-logo $(rustdoc_output)/static.files/
182 $(Q)find $(rustdoc_output) -name '*.html' -type f -print0 | xargs -0 sed -Ei \
183 -e 's:rust-logo-[0-9a-f]+\.svg:logo.svg:g' \
184 -e 's:favicon-[0-9a-f]+\.svg:logo.svg:g' \
185 -e 's:<link rel="alternate icon" type="image/png" href="[/.]+/static\.files/favicon-(16x16|32x32)-[0-9a-f]+\.png">::g' \
186 -e 's:<a href="srctree/([^"]+)">:<a href="$(realpath $(srctree))/\1">:g'
187 $(Q)for f in $(rustdoc_output)/static.files/rustdoc-*.css; do \
188 echo ".logo-container > img { object-fit: contain; }" >> $$f; done
189
190rustdoc-proc_macro2: private rustdoc_host = yes
191rustdoc-proc_macro2: private rustc_target_flags = $(proc_macro2-flags)
192rustdoc-proc_macro2: $(src)/proc-macro2/lib.rs rustdoc-clean FORCE
193 +$(call if_changed,rustdoc)
194
195rustdoc-quote: private rustdoc_host = yes
196rustdoc-quote: private rustc_target_flags = $(quote-flags)
197rustdoc-quote: private skip_flags = $(quote-skip_flags)
198rustdoc-quote: $(src)/quote/lib.rs rustdoc-clean rustdoc-proc_macro2 FORCE
199 +$(call if_changed,rustdoc)
200
201rustdoc-syn: private rustdoc_host = yes
202rustdoc-syn: private rustc_target_flags = $(syn-flags)
203rustdoc-syn: $(src)/syn/lib.rs rustdoc-clean rustdoc-quote FORCE
204 +$(call if_changed,rustdoc)
205
206rustdoc-macros: private rustdoc_host = yes
207rustdoc-macros: private rustc_target_flags = --crate-type proc-macro \
208 --extern proc_macro --extern proc_macro2 --extern quote --extern syn
209rustdoc-macros: $(src)/macros/lib.rs rustdoc-clean rustdoc-proc_macro2 \
210 rustdoc-quote rustdoc-syn FORCE
211 +$(call if_changed,rustdoc)
212
213# Starting with Rust 1.82.0, skipping `-Wrustdoc::unescaped_backticks` should
214# not be needed -- see https://github.com/rust-lang/rust/pull/128307.
215rustdoc-core: private skip_flags = $(core-skip_flags)
216rustdoc-core: private rustc_target_flags = $(core-flags)
217rustdoc-core: $(RUST_LIB_SRC)/core/src/lib.rs rustdoc-clean FORCE
218 +$(call if_changed,rustdoc)
219
220# Even if `rustdoc` targets are not kernel objects, they should still be
221# treated as such so that we pass the same flags. Otherwise, for instance,
222# `rustdoc` will complain about missing sanitizer flags causing an ABI mismatch.
223rustdoc-compiler_builtins: private is-kernel-object := y
224rustdoc-compiler_builtins: $(src)/compiler_builtins.rs rustdoc-core FORCE
225 +$(call if_changed,rustdoc)
226
227rustdoc-ffi: private is-kernel-object := y
228rustdoc-ffi: $(src)/ffi.rs rustdoc-core FORCE
229 +$(call if_changed,rustdoc)
230
231rustdoc-pin_init_internal: private rustdoc_host = yes
232rustdoc-pin_init_internal: private rustc_target_flags = $(pin_init_internal-flags) \
233 --extern proc_macro --crate-type proc-macro
234rustdoc-pin_init_internal: $(src)/pin-init/internal/src/lib.rs \
235 rustdoc-clean rustdoc-proc_macro2 rustdoc-quote rustdoc-syn FORCE
236 +$(call if_changed,rustdoc)
237
238rustdoc-pin_init: private rustdoc_host = yes
239rustdoc-pin_init: private rustc_target_flags = $(pin_init-flags) \
240 --extern alloc --cfg feature=\"alloc\"
241rustdoc-pin_init: $(src)/pin-init/src/lib.rs rustdoc-pin_init_internal \
242 rustdoc-macros FORCE
243 +$(call if_changed,rustdoc)
244
245rustdoc-kernel: private is-kernel-object := y
246rustdoc-kernel: private rustc_target_flags = --extern ffi --extern pin_init \
247 --extern build_error --extern macros \
248 --extern bindings --extern uapi
249rustdoc-kernel: $(src)/kernel/lib.rs rustdoc-core rustdoc-ffi rustdoc-macros \
250 rustdoc-pin_init rustdoc-compiler_builtins $(obj)/$(libmacros_name) \
251 $(obj)/bindings.o FORCE
252 +$(call if_changed,rustdoc)
253
254rustdoc-clean: FORCE
255 $(Q)rm -rf $(rustdoc_output)
256
257quiet_cmd_rustc_test_library = $(RUSTC_OR_CLIPPY_QUIET) TL $<
258 cmd_rustc_test_library = \
259 OBJTREE=$(abspath $(objtree)) \
260 $(RUSTC_OR_CLIPPY) $(filter-out $(skip_flags),$(rust_common_flags) $(rustc_target_flags)) \
261 @$(objtree)/include/generated/rustc_cfg \
262 --crate-type $(if $(rustc_test_library_proc),proc-macro,rlib) \
263 --out-dir $(objtree)/$(obj)/test --cfg testlib \
264 -L$(objtree)/$(obj)/test \
265 --crate-name $(subst rusttest-,,$(subst rusttestlib-,,$@)) $<
266
267rusttestlib-build_error: $(src)/build_error.rs FORCE
268 +$(call if_changed,rustc_test_library)
269
270rusttestlib-ffi: $(src)/ffi.rs FORCE
271 +$(call if_changed,rustc_test_library)
272
273rusttestlib-proc_macro2: private rustc_target_flags = $(proc_macro2-flags)
274rusttestlib-proc_macro2: $(src)/proc-macro2/lib.rs FORCE
275 +$(call if_changed,rustc_test_library)
276
277rusttestlib-quote: private skip_flags = $(quote-skip_flags)
278rusttestlib-quote: private rustc_target_flags = $(quote-flags)
279rusttestlib-quote: $(src)/quote/lib.rs rusttestlib-proc_macro2 FORCE
280 +$(call if_changed,rustc_test_library)
281
282rusttestlib-syn: private rustc_target_flags = $(syn-flags)
283rusttestlib-syn: $(src)/syn/lib.rs rusttestlib-quote FORCE
284 +$(call if_changed,rustc_test_library)
285
286rusttestlib-macros: private rustc_target_flags = --extern proc_macro \
287 --extern proc_macro2 --extern quote --extern syn
288rusttestlib-macros: private rustc_test_library_proc = yes
289rusttestlib-macros: $(src)/macros/lib.rs \
290 rusttestlib-proc_macro2 rusttestlib-quote rusttestlib-syn FORCE
291 +$(call if_changed,rustc_test_library)
292
293rusttestlib-pin_init_internal: private rustc_target_flags = $(pin_init_internal-flags) \
294 --extern proc_macro
295rusttestlib-pin_init_internal: private rustc_test_library_proc = yes
296rusttestlib-pin_init_internal: $(src)/pin-init/internal/src/lib.rs \
297 rusttestlib-proc_macro2 rusttestlib-quote rusttestlib-syn FORCE
298 +$(call if_changed,rustc_test_library)
299
300rusttestlib-pin_init: private rustc_target_flags = $(pin_init-flags)
301rusttestlib-pin_init: $(src)/pin-init/src/lib.rs rusttestlib-macros \
302 rusttestlib-pin_init_internal $(obj)/$(libpin_init_internal_name) FORCE
303 +$(call if_changed,rustc_test_library)
304
305rusttestlib-kernel: private rustc_target_flags = --extern ffi \
306 --extern build_error --extern macros --extern pin_init \
307 --extern bindings --extern uapi
308rusttestlib-kernel: $(src)/kernel/lib.rs rusttestlib-bindings rusttestlib-uapi \
309 rusttestlib-build_error rusttestlib-pin_init $(obj)/$(libmacros_name) \
310 $(obj)/bindings.o FORCE
311 +$(call if_changed,rustc_test_library)
312
313rusttestlib-bindings: private rustc_target_flags = --extern ffi --extern pin_init
314rusttestlib-bindings: $(src)/bindings/lib.rs rusttestlib-ffi rusttestlib-pin_init FORCE
315 +$(call if_changed,rustc_test_library)
316
317rusttestlib-uapi: private rustc_target_flags = --extern ffi --extern pin_init
318rusttestlib-uapi: $(src)/uapi/lib.rs rusttestlib-ffi rusttestlib-pin_init FORCE
319 +$(call if_changed,rustc_test_library)
320
321quiet_cmd_rustdoc_test = RUSTDOC T $<
322 cmd_rustdoc_test = \
323 RUST_MODFILE=test.rs \
324 OBJTREE=$(abspath $(objtree)) \
325 $(RUSTDOC) --test $(rust_common_flags) \
326 -Zcrate-attr='feature(used_with_arg)' \
327 @$(objtree)/include/generated/rustc_cfg \
328 $(rustc_target_flags) $(rustdoc_test_target_flags) \
329 $(rustdoc_test_quiet) \
330 -L$(objtree)/$(obj)/test --output $(rustdoc_output) \
331 --crate-name $(subst rusttest-,,$@) $<
332
333quiet_cmd_rustdoc_test_kernel = RUSTDOC TK $<
334 cmd_rustdoc_test_kernel = \
335 rm -rf $(objtree)/$(obj)/test/doctests/kernel; \
336 mkdir -p $(objtree)/$(obj)/test/doctests/kernel; \
337 OBJTREE=$(abspath $(objtree)) \
338 $(RUSTDOC) --test $(filter-out --remap-path-prefix=% --remap-path-scope=%,$(rust_flags)) \
339 -L$(objtree)/$(obj) --extern ffi --extern pin_init \
340 --extern kernel --extern build_error --extern macros \
341 --extern bindings --extern uapi \
342 --no-run --crate-name kernel -Zunstable-options \
343 --sysroot=/dev/null \
344 $(doctests_modifiers_workaround) \
345 --test-builder $(objtree)/scripts/rustdoc_test_builder \
346 $< $(rustdoc_test_kernel_quiet); \
347 $(objtree)/scripts/rustdoc_test_gen
348
349%/doctests_kernel_generated.rs %/doctests_kernel_generated_kunit.c: \
350 $(src)/kernel/lib.rs $(obj)/kernel.o \
351 $(objtree)/scripts/rustdoc_test_builder \
352 $(objtree)/scripts/rustdoc_test_gen FORCE
353 +$(call if_changed,rustdoc_test_kernel)
354
355# We cannot use `-Zpanic-abort-tests` because some tests are dynamic,
356# so for the moment we skip `-Cpanic=abort`.
357quiet_cmd_rustc_test = $(RUSTC_OR_CLIPPY_QUIET) T $<
358 cmd_rustc_test = \
359 OBJTREE=$(abspath $(objtree)) \
360 $(RUSTC_OR_CLIPPY) --test $(rust_common_flags) \
361 @$(objtree)/include/generated/rustc_cfg \
362 $(rustc_target_flags) --out-dir $(objtree)/$(obj)/test \
363 -L$(objtree)/$(obj)/test \
364 --crate-name $(subst rusttest-,,$@) $<; \
365 $(objtree)/$(obj)/test/$(subst rusttest-,,$@) $(rust_test_quiet) \
366 $(rustc_test_run_flags)
367
368rusttest: rusttest-macros
369
370rusttest-macros: private rustc_target_flags = --extern proc_macro \
371 --extern macros --extern kernel --extern pin_init \
372 --extern proc_macro2 --extern quote --extern syn
373rusttest-macros: private rustdoc_test_target_flags = --crate-type proc-macro
374rusttest-macros: $(src)/macros/lib.rs \
375 rusttestlib-macros rusttestlib-kernel rusttestlib-pin_init FORCE
376 +$(call if_changed,rustc_test)
377 +$(call if_changed,rustdoc_test)
378
379ifdef CONFIG_CC_IS_CLANG
380bindgen_c_flags = $(c_flags)
381else
382# bindgen relies on libclang to parse C. Ideally, bindgen would support a GCC
383# plugin backend and/or the Clang driver would be perfectly compatible with GCC.
384#
385# For the moment, here we are tweaking the flags on the fly. This is a hack,
386# and some kernel configurations may not work (e.g. `GCC_PLUGIN_RANDSTRUCT`
387# if we end up using one of those structs).
388bindgen_skip_c_flags := -mno-fp-ret-in-387 -mpreferred-stack-boundary=% \
389 -mskip-rax-setup -mgeneral-regs-only -msign-return-address=% \
390 -mindirect-branch=thunk-extern -mindirect-branch-register \
391 -mfunction-return=thunk-extern -mrecord-mcount -mabi=lp64 \
392 -mindirect-branch-cs-prefix -mstack-protector-guard% -mtraceback=no \
393 -mno-pointers-to-nested-functions -mno-string \
394 -mno-strict-align -mstrict-align -mdirect-extern-access \
395 -mexplicit-relocs -mno-check-zero-division \
396 -fconserve-stack -falign-jumps=% -falign-loops=% \
397 -femit-struct-debug-baseonly -fno-ipa-cp-clone -fno-ipa-sra \
398 -fno-partial-inlining -fplugin-arg-arm_ssp_per_task_plugin-% \
399 -fno-reorder-blocks -fno-allow-store-data-races -fasan-shadow-offset=% \
400 -fzero-call-used-regs=% -fno-stack-clash-protection \
401 -fno-inline-functions-called-once -fsanitize=bounds-strict \
402 -fstrict-flex-arrays=% -fmin-function-alignment=% \
403 -fzero-init-padding-bits=% -mno-fdpic \
404 -fdiagnostics-show-context -fdiagnostics-show-context=% \
405 --param=% --param asan-% -fno-isolate-erroneous-paths-dereference
406
407# Derived from `scripts/Makefile.clang`.
408BINDGEN_TARGET_x86 := x86_64-linux-gnu
409BINDGEN_TARGET_arm64 := aarch64-linux-gnu
410BINDGEN_TARGET_arm := arm-linux-gnueabi
411BINDGEN_TARGET_loongarch := loongarch64-linux-gnusf
412BINDGEN_TARGET_um := $(BINDGEN_TARGET_$(SUBARCH))
413BINDGEN_TARGET := $(BINDGEN_TARGET_$(SRCARCH))
414
415# All warnings are inhibited since GCC builds are very experimental,
416# many GCC warnings are not supported by Clang, they may only appear in
417# some configurations, with new GCC versions, etc.
418bindgen_extra_c_flags = -w --target=$(BINDGEN_TARGET)
419
420# Auto variable zero-initialization requires an additional special option with
421# clang that is going to be removed sometime in the future (likely in
422# clang-18), so make sure to pass this option only if clang supports it
423# (libclang major version < 16).
424#
425# https://github.com/llvm/llvm-project/issues/44842
426# https://github.com/llvm/llvm-project/blob/llvmorg-16.0.0-rc2/clang/docs/ReleaseNotes.rst#deprecated-compiler-flags
427ifdef CONFIG_INIT_STACK_ALL_ZERO
428libclang_maj_ver=$(shell $(BINDGEN) $(srctree)/scripts/rust_is_available_bindgen_libclang.h 2>&1 | sed -ne 's/.*clang version \([0-9]*\).*/\1/p')
429ifeq ($(shell expr $(libclang_maj_ver) \< 16), 1)
430bindgen_extra_c_flags += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
431endif
432endif
433
434bindgen_c_flags = $(filter-out $(bindgen_skip_c_flags), $(c_flags)) \
435 $(bindgen_extra_c_flags)
436endif
437
438ifdef CONFIG_LTO
439bindgen_c_flags_lto = $(filter-out $(CC_FLAGS_LTO), $(bindgen_c_flags))
440else
441bindgen_c_flags_lto = $(bindgen_c_flags)
442endif
443
444# `-fno-builtin` is passed to avoid `bindgen` from using `clang` builtin
445# prototypes for functions like `memcpy` -- if this flag is not passed,
446# `bindgen`-generated prototypes use `c_ulong` or `c_uint` depending on
447# architecture instead of generating `usize`.
448bindgen_c_flags_final = $(bindgen_c_flags_lto) -fno-builtin -D__BINDGEN__
449
450# Each `bindgen` release may upgrade the list of Rust target versions. By
451# default, the highest stable release in their list is used. Thus we need to set
452# a `--rust-target` to avoid future `bindgen` releases emitting code that
453# `rustc` may not understand. On top of that, `bindgen` does not support passing
454# an unknown Rust target version.
455#
456# Therefore, the Rust target for `bindgen` can be only as high as the minimum
457# Rust version the kernel supports and only as high as the greatest stable Rust
458# target supported by the minimum `bindgen` version the kernel supports (that
459# is, if we do not test the actual `rustc`/`bindgen` versions running).
460#
461# Starting with `bindgen` 0.71.0, we will be able to set any future Rust version
462# instead, i.e. we will be able to set here our minimum supported Rust version.
463quiet_cmd_bindgen = BINDGEN $@
464 cmd_bindgen = \
465 $(BINDGEN) $< $(bindgen_target_flags) --rust-target 1.68 \
466 --use-core --with-derive-default --ctypes-prefix ffi --no-layout-tests \
467 --no-debug '.*' --enable-function-attribute-detection \
468 -o $@ -- $(bindgen_c_flags_final) -DMODULE \
469 $(bindgen_target_cflags) $(bindgen_target_extra)
470
471$(obj)/bindings/bindings_generated.rs: private bindgen_target_flags = \
472 $(shell grep -Ev '^#|^$$' $(src)/bindgen_parameters)
473$(obj)/bindings/bindings_generated.rs: private bindgen_target_extra = ; \
474 sed -Ei 's/pub const RUST_CONST_HELPER_([a-zA-Z0-9_]*)/pub const \1/g' $@
475$(obj)/bindings/bindings_generated.rs: $(src)/bindings/bindings_helper.h \
476 $(src)/bindgen_parameters FORCE
477 $(call if_changed_dep,bindgen)
478
479$(obj)/uapi/uapi_generated.rs: private bindgen_target_flags = \
480 $(shell grep -Ev '^#|^$$' $(src)/bindgen_parameters)
481$(obj)/uapi/uapi_generated.rs: $(src)/uapi/uapi_helper.h \
482 $(src)/bindgen_parameters FORCE
483 $(call if_changed_dep,bindgen)
484
485# See `CFLAGS_REMOVE_helpers.o` above. In addition, Clang on C does not warn
486# with `-Wmissing-declarations` (unlike GCC), so it is not strictly needed here
487# given it is `libclang`; but for consistency, future Clang changes and/or
488# a potential future GCC backend for `bindgen`, we disable it too.
489$(obj)/bindings/bindings_helpers_generated.rs: private bindgen_target_flags = \
490 --blocklist-type '.*' --allowlist-var '' \
491 --allowlist-function 'rust_helper_.*'
492$(obj)/bindings/bindings_helpers_generated.rs: private bindgen_target_cflags = \
493 -I$(objtree)/$(obj) -Wno-missing-prototypes -Wno-missing-declarations
494$(obj)/bindings/bindings_helpers_generated.rs: private bindgen_target_extra = ; \
495 sed -Ei 's/pub fn rust_helper_([a-zA-Z0-9_]*)/#[link_name="rust_helper_\1"]\n pub fn \1/g' $@
496$(obj)/bindings/bindings_helpers_generated.rs: $(src)/helpers/helpers.c FORCE
497 $(call if_changed_dep,bindgen)
498
499rust_exports = $(NM) -p --defined-only $(1) | awk '$$2~/(T|R|D|B)/ && $$3!~/__(pfx|cfi|odr_asan)/ { printf $(2),$$3 }'
500
501quiet_cmd_exports = EXPORTS $@
502 cmd_exports = \
503 $(call rust_exports,$<,"EXPORT_SYMBOL_RUST_GPL(%s);\n") > $@
504
505$(obj)/exports_core_generated.h: $(obj)/core.o FORCE
506 $(call if_changed,exports)
507
508# Even though Rust kernel modules should never use the bindings directly,
509# symbols from the `bindings` crate and the C helpers need to be exported
510# because Rust generics and inlined functions may not get their code generated
511# in the crate where they are defined. Other helpers, called from non-inline
512# functions, may not be exported, in principle. However, in general, the Rust
513# compiler does not guarantee codegen will be performed for a non-inline
514# function either. Therefore, we export all symbols from helpers and bindings.
515# In the future, this may be revisited to reduce the number of exports after
516# the compiler is informed about the places codegen is required.
517$(obj)/exports_helpers_generated.h: $(obj)/helpers/helpers.o FORCE
518 $(call if_changed,exports)
519
520$(obj)/exports_bindings_generated.h: $(obj)/bindings.o FORCE
521 $(call if_changed,exports)
522
523$(obj)/exports_kernel_generated.h: $(obj)/kernel.o FORCE
524 $(call if_changed,exports)
525
526quiet_cmd_rustc_procmacrolibrary = $(RUSTC_OR_CLIPPY_QUIET) PL $@
527 cmd_rustc_procmacrolibrary = \
528 $(if $(skip_clippy),$(RUSTC),$(RUSTC_OR_CLIPPY)) \
529 $(filter-out $(skip_flags),$(rust_common_flags) $(rustc_target_flags)) \
530 --emit=dep-info=$(depfile) --emit=link=$@ --crate-type rlib -O \
531 --out-dir $(objtree)/$(obj) -L$(objtree)/$(obj) \
532 --crate-name $(patsubst lib%.rlib,%,$(notdir $@)) $<
533
534$(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
572# `rustc` requires `-Zunstable-options` to use custom target specifications
573# since Rust 1.95.0 (https://github.com/rust-lang/rust/pull/151534).
574quiet_cmd_rustc_library = $(if $(skip_clippy),RUSTC,$(RUSTC_OR_CLIPPY_QUIET)) L $@
575 cmd_rustc_library = \
576 OBJTREE=$(abspath $(objtree)) \
577 $(if $(skip_clippy),$(RUSTC),$(RUSTC_OR_CLIPPY)) \
578 $(filter-out $(skip_flags),$(rust_flags)) $(rustc_target_flags) \
579 --emit=dep-info=$(depfile) --emit=obj=$@ \
580 --emit=metadata=$(dir $@)$(patsubst %.o,lib%.rmeta,$(notdir $@)) \
581 --crate-type rlib -L$(objtree)/$(obj) \
582 --crate-name $(patsubst %.o,%,$(notdir $@)) $< \
583 --sysroot=/dev/null \
584 -Zunstable-options \
585 $(if $(rustc_objcopy),;$(OBJCOPY) $(rustc_objcopy) $@) \
586 $(cmd_objtool)
587
588rust-analyzer:
589 $(Q)MAKEFLAGS= $(srctree)/scripts/generate_rust_analyzer.py \
590 --cfgs='core=$(core-cfgs)' $(core-edition) \
591 --cfgs='proc_macro2=$(proc_macro2-cfgs)' \
592 --cfgs='quote=$(quote-cfgs)' \
593 --cfgs='syn=$(syn-cfgs)' \
594 $(realpath $(srctree)) $(realpath $(objtree)) \
595 $(rustc_sysroot) $(RUST_LIB_SRC) $(if $(KBUILD_EXTMOD),$(srcroot)) \
596 > rust-project.json
597
598redirect-intrinsics = \
599 __addsf3 __eqsf2 __extendsfdf2 __gesf2 __lesf2 __ltsf2 __mulsf3 __nesf2 __truncdfsf2 __unordsf2 \
600 __adddf3 __eqdf2 __ledf2 __ltdf2 __muldf3 __unorddf2 \
601 __muloti4 __multi3 \
602 __udivmodti4 __udivti3 __umodti3
603
604ifdef CONFIG_ARM
605 # Add eabi initrinsics for ARM 32-bit
606 redirect-intrinsics += \
607 __aeabi_fadd __aeabi_fmul __aeabi_fcmpeq __aeabi_fcmple __aeabi_fcmplt __aeabi_fcmpun \
608 __aeabi_dadd __aeabi_dmul __aeabi_dcmple __aeabi_dcmplt __aeabi_dcmpun \
609 __aeabi_uldivmod
610endif
611ifneq ($(or $(CONFIG_ARM64),$(and $(CONFIG_RISCV),$(CONFIG_64BIT))),)
612 # These intrinsics are defined for ARM64 and RISCV64
613 redirect-intrinsics += \
614 __ashrti3 \
615 __ashlti3 __lshrti3
616endif
617
618ifdef CONFIG_MODVERSIONS
619cmd_gendwarfksyms = $(if $(skip_gendwarfksyms),, \
620 $(call rust_exports,$@,"%s\n") | \
621 scripts/gendwarfksyms/gendwarfksyms \
622 $(if $(KBUILD_GENDWARFKSYMS_STABLE), --stable) \
623 $(if $(KBUILD_SYMTYPES), --symtypes $(@:.o=.symtypes),) \
624 $@ >> $(dot-target).cmd)
625endif
626
627define rule_rustc_library
628 $(call cmd_and_fixdep,rustc_library)
629 $(call cmd,gen_objtooldep)
630 $(call cmd,gendwarfksyms)
631endef
632
633define rule_rust_cc_library
634 $(call if_changed_rule,cc_o_c)
635 $(call cmd,force_checksrc)
636 $(call cmd,gendwarfksyms)
637endef
638
639# helpers.o uses the same export mechanism as Rust libraries, so ensure symbol
640# versions are calculated for the helpers too.
641$(obj)/helpers/helpers.o: $(src)/helpers/helpers.c $(recordmcount_source) FORCE
642 +$(call if_changed_rule,rust_cc_library)
643
644# Disable symbol versioning for exports.o to avoid conflicts with the actual
645# symbol versions generated from Rust objects.
646$(obj)/exports.o: private skip_gendwarfksyms = 1
647
648$(obj)/core.o: private skip_clippy = 1
649$(obj)/core.o: private skip_flags = $(core-skip_flags)
650$(obj)/core.o: private rustc_objcopy = $(foreach sym,$(redirect-intrinsics),--redefine-sym $(sym)=__rust$(sym))
651$(obj)/core.o: private rustc_target_flags = $(core-flags)
652$(obj)/core.o: $(RUST_LIB_SRC)/core/src/lib.rs \
653 $(wildcard $(objtree)/include/config/RUSTC_VERSION_TEXT) FORCE
654 +$(call if_changed_rule,rustc_library)
655ifneq ($(or $(CONFIG_X86_64),$(CONFIG_X86_32)),)
656$(obj)/core.o: scripts/target.json
657endif
658KCOV_INSTRUMENT_core.o := n
659
660$(obj)/compiler_builtins.o: private skip_gendwarfksyms = 1
661$(obj)/compiler_builtins.o: private rustc_objcopy = -w -W '__*'
662$(obj)/compiler_builtins.o: $(src)/compiler_builtins.rs $(obj)/core.o FORCE
663 +$(call if_changed_rule,rustc_library)
664
665$(obj)/pin_init.o: private skip_gendwarfksyms = 1
666$(obj)/pin_init.o: private rustc_target_flags = $(pin_init-flags)
667$(obj)/pin_init.o: $(src)/pin-init/src/lib.rs $(obj)/compiler_builtins.o \
668 $(obj)/$(libpin_init_internal_name) $(obj)/$(libmacros_name) FORCE
669 +$(call if_changed_rule,rustc_library)
670
671# Even if normally `build_error` is not a kernel object, it should still be
672# treated as such so that we pass the same flags. Otherwise, for instance,
673# `rustc` will complain about missing sanitizer flags causing an ABI mismatch.
674$(obj)/build_error.o: private is-kernel-object := y
675$(obj)/build_error.o: private skip_gendwarfksyms = 1
676$(obj)/build_error.o: $(src)/build_error.rs $(obj)/compiler_builtins.o FORCE
677 +$(call if_changed_rule,rustc_library)
678
679$(obj)/ffi.o: private skip_gendwarfksyms = 1
680$(obj)/ffi.o: $(src)/ffi.rs $(obj)/compiler_builtins.o FORCE
681 +$(call if_changed_rule,rustc_library)
682
683$(obj)/bindings.o: private rustc_target_flags = --extern ffi --extern pin_init
684$(obj)/bindings.o: $(src)/bindings/lib.rs \
685 $(obj)/ffi.o \
686 $(obj)/pin_init.o \
687 $(obj)/bindings/bindings_generated.rs \
688 $(obj)/bindings/bindings_helpers_generated.rs FORCE
689 +$(call if_changed_rule,rustc_library)
690
691$(obj)/uapi.o: private rustc_target_flags = --extern ffi --extern pin_init
692$(obj)/uapi.o: private skip_gendwarfksyms = 1
693$(obj)/uapi.o: $(src)/uapi/lib.rs \
694 $(obj)/ffi.o \
695 $(obj)/pin_init.o \
696 $(obj)/uapi/uapi_generated.rs FORCE
697 +$(call if_changed_rule,rustc_library)
698
699$(obj)/kernel.o: private rustc_target_flags = --extern ffi --extern pin_init \
700 --extern build_error --extern macros --extern bindings --extern uapi
701$(obj)/kernel.o: $(src)/kernel/lib.rs $(obj)/build_error.o $(obj)/pin_init.o \
702 $(obj)/$(libmacros_name) $(obj)/bindings.o $(obj)/uapi.o FORCE
703 +$(call if_changed_rule,rustc_library)
704
705ifdef CONFIG_JUMP_LABEL
706$(obj)/kernel.o: $(obj)/kernel/generated_arch_static_branch_asm.rs
707endif
708ifndef CONFIG_UML
709ifdef CONFIG_BUG
710$(obj)/kernel.o: $(obj)/kernel/generated_arch_warn_asm.rs $(obj)/kernel/generated_arch_reachable_asm.rs
711endif
712endif
713
714endif # CONFIG_RUST