1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 2
3 # Where to place rustdoc generated documentati <<
4 rustdoc_output := $(objtree)/Documentation/out <<
5 <<
6 obj-$(CONFIG_RUST) += core.o compiler_builtins 3 obj-$(CONFIG_RUST) += core.o compiler_builtins.o
7 always-$(CONFIG_RUST) += exports_core_generate 4 always-$(CONFIG_RUST) += exports_core_generated.h
8 5
9 # Missing prototypes are expected in the helpe 6 # Missing prototypes are expected in the helpers since these are exported
10 # for Rust only, thus there is no header nor p 7 # for Rust only, thus there is no header nor prototypes.
11 obj-$(CONFIG_RUST) += helpers/helpers.o !! 8 obj-$(CONFIG_RUST) += helpers.o
12 CFLAGS_REMOVE_helpers/helpers.o = -Wmissing-pr !! 9 CFLAGS_REMOVE_helpers.o = -Wmissing-prototypes -Wmissing-declarations
13 10
14 always-$(CONFIG_RUST) += libmacros.so 11 always-$(CONFIG_RUST) += libmacros.so
15 no-clean-files += libmacros.so 12 no-clean-files += libmacros.so
16 13
17 always-$(CONFIG_RUST) += bindings/bindings_gen 14 always-$(CONFIG_RUST) += bindings/bindings_generated.rs bindings/bindings_helpers_generated.rs
18 obj-$(CONFIG_RUST) += alloc.o bindings.o kerne 15 obj-$(CONFIG_RUST) += alloc.o bindings.o kernel.o
19 always-$(CONFIG_RUST) += exports_alloc_generat !! 16 always-$(CONFIG_RUST) += exports_alloc_generated.h exports_bindings_generated.h \
20 exports_bindings_generated.h exports_kerne !! 17 exports_kernel_generated.h
21 18
22 always-$(CONFIG_RUST) += uapi/uapi_generated.r 19 always-$(CONFIG_RUST) += uapi/uapi_generated.rs
23 obj-$(CONFIG_RUST) += uapi.o 20 obj-$(CONFIG_RUST) += uapi.o
24 21
25 ifdef CONFIG_RUST_BUILD_ASSERT_ALLOW 22 ifdef CONFIG_RUST_BUILD_ASSERT_ALLOW
26 obj-$(CONFIG_RUST) += build_error.o 23 obj-$(CONFIG_RUST) += build_error.o
27 else 24 else
28 always-$(CONFIG_RUST) += build_error.o 25 always-$(CONFIG_RUST) += build_error.o
29 endif 26 endif
30 27
31 obj-$(CONFIG_RUST) += exports.o 28 obj-$(CONFIG_RUST) += exports.o
32 29
33 always-$(CONFIG_RUST_KERNEL_DOCTESTS) += docte <<
34 always-$(CONFIG_RUST_KERNEL_DOCTESTS) += docte <<
35 <<
36 obj-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests <<
37 obj-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests <<
38 <<
39 # Avoids running `$(RUSTC)` for the sysroot wh 30 # Avoids running `$(RUSTC)` for the sysroot when it may not be available.
40 ifdef CONFIG_RUST 31 ifdef CONFIG_RUST
41 32
42 # `$(rust_flags)` is passed in case the user a 33 # `$(rust_flags)` is passed in case the user added `--sysroot`.
43 rustc_sysroot := $(shell MAKEFLAGS= $(RUSTC) $ !! 34 rustc_sysroot := $(shell $(RUSTC) $(rust_flags) --print sysroot)
44 rustc_host_target := $(shell $(RUSTC) --versio 35 rustc_host_target := $(shell $(RUSTC) --version --verbose | grep -F 'host: ' | cut -d' ' -f2)
45 RUST_LIB_SRC ?= $(rustc_sysroot)/lib/rustlib/s 36 RUST_LIB_SRC ?= $(rustc_sysroot)/lib/rustlib/src/rust/library
46 37
47 ifneq ($(quiet),) !! 38 ifeq ($(quiet),silent_)
>> 39 cargo_quiet=-q
>> 40 rust_test_quiet=-q
>> 41 rustdoc_test_quiet=--test-args -q
>> 42 else ifeq ($(quiet),quiet_)
48 rust_test_quiet=-q 43 rust_test_quiet=-q
49 rustdoc_test_quiet=--test-args -q 44 rustdoc_test_quiet=--test-args -q
50 rustdoc_test_kernel_quiet=>/dev/null !! 45 else
>> 46 cargo_quiet=--verbose
51 endif 47 endif
52 48
53 core-cfgs = \ 49 core-cfgs = \
54 --cfg no_fp_fmt_parse 50 --cfg no_fp_fmt_parse
55 51
56 alloc-cfgs = \ 52 alloc-cfgs = \
>> 53 --cfg no_borrow \
>> 54 --cfg no_fmt \
57 --cfg no_global_oom_handling \ 55 --cfg no_global_oom_handling \
>> 56 --cfg no_macros \
58 --cfg no_rc \ 57 --cfg no_rc \
59 --cfg no_sync !! 58 --cfg no_str \
>> 59 --cfg no_string \
>> 60 --cfg no_sync \
>> 61 --cfg no_thin
60 62
61 quiet_cmd_rustdoc = RUSTDOC $(if $(rustdoc_hos 63 quiet_cmd_rustdoc = RUSTDOC $(if $(rustdoc_host),H, ) $<
62 cmd_rustdoc = \ 64 cmd_rustdoc = \
63 OBJTREE=$(abspath $(objtree)) \ 65 OBJTREE=$(abspath $(objtree)) \
64 $(RUSTDOC) $(if $(rustdoc_host),$(rust 66 $(RUSTDOC) $(if $(rustdoc_host),$(rust_common_flags),$(rust_flags)) \
65 $(rustc_target_flags) -L$(objt 67 $(rustc_target_flags) -L$(objtree)/$(obj) \
66 -Zunstable-options --generate- !! 68 --output $(objtree)/$(obj)/doc \
67 --output $(rustdoc_output) \ <<
68 --crate-name $(subst rustdoc-, 69 --crate-name $(subst rustdoc-,,$@) \
69 $(if $(rustdoc_host),,--sysroo <<
70 @$(objtree)/include/generated/ 70 @$(objtree)/include/generated/rustc_cfg $<
71 71
72 # The `html_logo_url` and `html_favicon_url` f 72 # The `html_logo_url` and `html_favicon_url` forms of the `doc` attribute
73 # can be used to specify a custom logo. Howeve 73 # can be used to specify a custom logo. However:
74 # - The given value is used as-is, thus it c 74 # - The given value is used as-is, thus it cannot be relative or a local file
75 # (unlike the non-custom case) since the g 75 # (unlike the non-custom case) since the generated docs have subfolders.
76 # - It requires adding it to every crate. 76 # - It requires adding it to every crate.
77 # - It requires changing `core` which comes 77 # - It requires changing `core` which comes from the sysroot.
78 # 78 #
79 # Using `-Zcrate-attr` would solve the last tw 79 # Using `-Zcrate-attr` would solve the last two points, but not the first.
80 # The https://github.com/rust-lang/rfcs/pull/3 80 # The https://github.com/rust-lang/rfcs/pull/3226 RFC suggests two new
81 # command-like flags to solve the issue. Meanw 81 # command-like flags to solve the issue. Meanwhile, we use the non-custom case
82 # and then retouch the generated files. 82 # and then retouch the generated files.
83 rustdoc: rustdoc-core rustdoc-macros rustdoc-c 83 rustdoc: rustdoc-core rustdoc-macros rustdoc-compiler_builtins \
84 rustdoc-alloc rustdoc-kernel 84 rustdoc-alloc rustdoc-kernel
85 $(Q)cp $(srctree)/Documentation/images !! 85 $(Q)cp $(srctree)/Documentation/images/logo.svg $(objtree)/$(obj)/doc
86 $(Q)cp $(srctree)/Documentation/images !! 86 $(Q)cp $(srctree)/Documentation/images/COPYING-logo $(objtree)/$(obj)/doc
87 $(Q)find $(rustdoc_output) -name '*.ht !! 87 $(Q)find $(objtree)/$(obj)/doc -name '*.html' -type f -print0 | xargs -0 sed -Ei \
88 -e 's:rust-logo-[0-9a-f]+\.svg !! 88 -e 's:rust-logo\.svg:logo.svg:g' \
89 -e 's:favicon-[0-9a-f]+\.svg:l !! 89 -e 's:rust-logo\.png:logo.svg:g' \
90 -e 's:<link rel="alternate ico !! 90 -e 's:favicon\.svg:logo.svg:g' \
91 -e 's:<a href="srctree/([^"]+) !! 91 -e 's:<link rel="alternate icon" type="image/png" href="[./]*favicon-(16x16|32x32)\.png">::g'
92 $(Q)for f in $(rustdoc_output)/static. !! 92 $(Q)echo '.logo-container > img { object-fit: contain; }' \
93 echo ".logo-container > img { !! 93 >> $(objtree)/$(obj)/doc/rustdoc.css
94 94
95 rustdoc-macros: private rustdoc_host = yes 95 rustdoc-macros: private rustdoc_host = yes
96 rustdoc-macros: private rustc_target_flags = - 96 rustdoc-macros: private rustc_target_flags = --crate-type proc-macro \
97 --extern proc_macro 97 --extern proc_macro
98 rustdoc-macros: $(src)/macros/lib.rs FORCE 98 rustdoc-macros: $(src)/macros/lib.rs FORCE
99 +$(call if_changed,rustdoc) !! 99 $(call if_changed,rustdoc)
100 100
101 rustdoc-core: private rustc_target_flags = $(c 101 rustdoc-core: private rustc_target_flags = $(core-cfgs)
102 rustdoc-core: $(RUST_LIB_SRC)/core/src/lib.rs 102 rustdoc-core: $(RUST_LIB_SRC)/core/src/lib.rs FORCE
103 +$(call if_changed,rustdoc) !! 103 $(call if_changed,rustdoc)
104 104
105 rustdoc-compiler_builtins: $(src)/compiler_bui 105 rustdoc-compiler_builtins: $(src)/compiler_builtins.rs rustdoc-core FORCE
106 +$(call if_changed,rustdoc) !! 106 $(call if_changed,rustdoc)
107 107
108 # We need to allow `rustdoc::broken_intra_doc_ 108 # We need to allow `rustdoc::broken_intra_doc_links` because some
109 # `no_global_oom_handling` functions refer to 109 # `no_global_oom_handling` functions refer to non-`no_global_oom_handling`
110 # functions. Ideally `rustdoc` would have a wa 110 # functions. Ideally `rustdoc` would have a way to distinguish broken links
111 # due to things that are "configured out" vs. 111 # due to things that are "configured out" vs. entirely non-existing ones.
112 rustdoc-alloc: private rustc_target_flags = $( 112 rustdoc-alloc: private rustc_target_flags = $(alloc-cfgs) \
113 -Arustdoc::broken_intra_doc_links 113 -Arustdoc::broken_intra_doc_links
114 rustdoc-alloc: $(RUST_LIB_SRC)/alloc/src/lib.r !! 114 rustdoc-alloc: $(src)/alloc/lib.rs rustdoc-core rustdoc-compiler_builtins FORCE
115 +$(call if_changed,rustdoc) !! 115 $(call if_changed,rustdoc)
116 116
117 rustdoc-kernel: private rustc_target_flags = - 117 rustdoc-kernel: private rustc_target_flags = --extern alloc \
118 --extern build_error --extern macros=$(obj 118 --extern build_error --extern macros=$(objtree)/$(obj)/libmacros.so \
119 --extern bindings --extern uapi 119 --extern bindings --extern uapi
120 rustdoc-kernel: $(src)/kernel/lib.rs rustdoc-c 120 rustdoc-kernel: $(src)/kernel/lib.rs rustdoc-core rustdoc-macros \
121 rustdoc-compiler_builtins rustdoc-alloc $( 121 rustdoc-compiler_builtins rustdoc-alloc $(obj)/libmacros.so \
122 $(obj)/bindings.o FORCE 122 $(obj)/bindings.o FORCE
123 +$(call if_changed,rustdoc) !! 123 $(call if_changed,rustdoc)
124 124
125 quiet_cmd_rustc_test_library = RUSTC TL $< 125 quiet_cmd_rustc_test_library = RUSTC TL $<
126 cmd_rustc_test_library = \ 126 cmd_rustc_test_library = \
127 OBJTREE=$(abspath $(objtree)) \ 127 OBJTREE=$(abspath $(objtree)) \
128 $(RUSTC) $(rust_common_flags) \ 128 $(RUSTC) $(rust_common_flags) \
129 @$(objtree)/include/generated/ 129 @$(objtree)/include/generated/rustc_cfg $(rustc_target_flags) \
130 --crate-type $(if $(rustc_test 130 --crate-type $(if $(rustc_test_library_proc),proc-macro,rlib) \
131 --out-dir $(objtree)/$(obj)/te 131 --out-dir $(objtree)/$(obj)/test --cfg testlib \
>> 132 --sysroot $(objtree)/$(obj)/test/sysroot \
132 -L$(objtree)/$(obj)/test \ 133 -L$(objtree)/$(obj)/test \
133 --crate-name $(subst rusttest- 134 --crate-name $(subst rusttest-,,$(subst rusttestlib-,,$@)) $<
134 135
135 rusttestlib-build_error: $(src)/build_error.rs !! 136 rusttestlib-build_error: $(src)/build_error.rs rusttest-prepare FORCE
136 +$(call if_changed,rustc_test_library) !! 137 $(call if_changed,rustc_test_library)
137 138
138 rusttestlib-macros: private rustc_target_flags 139 rusttestlib-macros: private rustc_target_flags = --extern proc_macro
139 rusttestlib-macros: private rustc_test_library 140 rusttestlib-macros: private rustc_test_library_proc = yes
140 rusttestlib-macros: $(src)/macros/lib.rs FORCE !! 141 rusttestlib-macros: $(src)/macros/lib.rs rusttest-prepare FORCE
141 +$(call if_changed,rustc_test_library) !! 142 $(call if_changed,rustc_test_library)
142 143
143 rusttestlib-bindings: $(src)/bindings/lib.rs F !! 144 rusttestlib-bindings: $(src)/bindings/lib.rs rusttest-prepare FORCE
144 +$(call if_changed,rustc_test_library) !! 145 $(call if_changed,rustc_test_library)
145 146
146 rusttestlib-uapi: $(src)/uapi/lib.rs FORCE !! 147 rusttestlib-uapi: $(src)/uapi/lib.rs rusttest-prepare FORCE
147 +$(call if_changed,rustc_test_library) !! 148 $(call if_changed,rustc_test_library)
148 149
149 quiet_cmd_rustdoc_test = RUSTDOC T $< 150 quiet_cmd_rustdoc_test = RUSTDOC T $<
150 cmd_rustdoc_test = \ 151 cmd_rustdoc_test = \
151 OBJTREE=$(abspath $(objtree)) \ 152 OBJTREE=$(abspath $(objtree)) \
152 $(RUSTDOC) --test $(rust_common_flags) 153 $(RUSTDOC) --test $(rust_common_flags) \
153 @$(objtree)/include/generated/ 154 @$(objtree)/include/generated/rustc_cfg \
154 $(rustc_target_flags) $(rustdo 155 $(rustc_target_flags) $(rustdoc_test_target_flags) \
155 $(rustdoc_test_quiet) \ !! 156 --sysroot $(objtree)/$(obj)/test/sysroot $(rustdoc_test_quiet) \
156 -L$(objtree)/$(obj)/test --out !! 157 -L$(objtree)/$(obj)/test --output $(objtree)/$(obj)/doc \
157 --crate-name $(subst rusttest- 158 --crate-name $(subst rusttest-,,$@) $<
158 159
159 quiet_cmd_rustdoc_test_kernel = RUSTDOC TK $< <<
160 cmd_rustdoc_test_kernel = \ <<
161 rm -rf $(objtree)/$(obj)/test/doctests <<
162 mkdir -p $(objtree)/$(obj)/test/doctes <<
163 OBJTREE=$(abspath $(objtree)) \ <<
164 $(RUSTDOC) --test $(rust_flags) \ <<
165 -L$(objtree)/$(obj) --extern a <<
166 --extern build_error --extern <<
167 --extern bindings --extern uap <<
168 --no-run --crate-name kernel - <<
169 --sysroot=/dev/null \ <<
170 --test-builder $(objtree)/scri <<
171 $< $(rustdoc_test_kernel_quiet <<
172 $(objtree)/scripts/rustdoc_test_gen <<
173 <<
174 %/doctests_kernel_generated.rs %/doctests_kern <<
175 $(src)/kernel/lib.rs $(obj)/kernel.o \ <<
176 $(objtree)/scripts/rustdoc_test_builder \ <<
177 $(objtree)/scripts/rustdoc_test_gen FORCE <<
178 +$(call if_changed,rustdoc_test_kernel <<
179 <<
180 # We cannot use `-Zpanic-abort-tests` because 160 # We cannot use `-Zpanic-abort-tests` because some tests are dynamic,
181 # so for the moment we skip `-Cpanic=abort`. 161 # so for the moment we skip `-Cpanic=abort`.
182 quiet_cmd_rustc_test = RUSTC T $< 162 quiet_cmd_rustc_test = RUSTC T $<
183 cmd_rustc_test = \ 163 cmd_rustc_test = \
184 OBJTREE=$(abspath $(objtree)) \ 164 OBJTREE=$(abspath $(objtree)) \
185 $(RUSTC) --test $(rust_common_flags) \ 165 $(RUSTC) --test $(rust_common_flags) \
186 @$(objtree)/include/generated/ 166 @$(objtree)/include/generated/rustc_cfg \
187 $(rustc_target_flags) --out-di 167 $(rustc_target_flags) --out-dir $(objtree)/$(obj)/test \
>> 168 --sysroot $(objtree)/$(obj)/test/sysroot \
188 -L$(objtree)/$(obj)/test \ 169 -L$(objtree)/$(obj)/test \
189 --crate-name $(subst rusttest- 170 --crate-name $(subst rusttest-,,$@) $<; \
190 $(objtree)/$(obj)/test/$(subst rusttes 171 $(objtree)/$(obj)/test/$(subst rusttest-,,$@) $(rust_test_quiet) \
191 $(rustc_test_run_flags) 172 $(rustc_test_run_flags)
192 173
193 rusttest: rusttest-macros rusttest-kernel 174 rusttest: rusttest-macros rusttest-kernel
194 175
>> 176 # This prepares a custom sysroot with our custom `alloc` instead of
>> 177 # the standard one.
>> 178 #
>> 179 # This requires several hacks:
>> 180 # - Unlike `core` and `alloc`, `std` depends on more than a dozen crates,
>> 181 # including third-party crates that need to be downloaded, plus custom
>> 182 # `build.rs` steps. Thus hardcoding things here is not maintainable.
>> 183 # - `cargo` knows how to build the standard library, but it is an unstable
>> 184 # feature so far (`-Zbuild-std`).
>> 185 # - `cargo` only considers the use case of building the standard library
>> 186 # to use it in a given package. Thus we need to create a dummy package
>> 187 # and pick the generated libraries from there.
>> 188 # - Since we only keep a subset of upstream `alloc` in-tree, we need
>> 189 # to recreate it on the fly by putting our sources on top.
>> 190 # - The usual ways of modifying the dependency graph in `cargo` do not seem
>> 191 # to apply for the `-Zbuild-std` steps, thus we have to mislead it
>> 192 # by modifying the sources in the sysroot.
>> 193 # - To avoid messing with the user's Rust installation, we create a clone
>> 194 # of the sysroot. However, `cargo` ignores `RUSTFLAGS` in the `-Zbuild-std`
>> 195 # steps, thus we use a wrapper binary passed via `RUSTC` to pass the flag.
>> 196 #
>> 197 # In the future, we hope to avoid the whole ordeal by either:
>> 198 # - Making the `test` crate not depend on `std` (either improving upstream
>> 199 # or having our own custom crate).
>> 200 # - Making the tests run in kernel space (requires the previous point).
>> 201 # - Making `std` and friends be more like a "normal" crate, so that
>> 202 # `-Zbuild-std` and related hacks are not needed.
>> 203 quiet_cmd_rustsysroot = RUSTSYSROOT
>> 204 cmd_rustsysroot = \
>> 205 rm -rf $(objtree)/$(obj)/test; \
>> 206 mkdir -p $(objtree)/$(obj)/test; \
>> 207 cp -a $(rustc_sysroot) $(objtree)/$(obj)/test/sysroot; \
>> 208 cp -r $(srctree)/$(src)/alloc/* \
>> 209 $(objtree)/$(obj)/test/sysroot/lib/rustlib/src/rust/library/alloc/src; \
>> 210 echo '\#!/bin/sh' > $(objtree)/$(obj)/test/rustc_sysroot; \
>> 211 echo "$(RUSTC) --sysroot=$(abspath $(objtree)/$(obj)/test/sysroot) \"\$$@\"" \
>> 212 >> $(objtree)/$(obj)/test/rustc_sysroot; \
>> 213 chmod u+x $(objtree)/$(obj)/test/rustc_sysroot; \
>> 214 $(CARGO) -q new $(objtree)/$(obj)/test/dummy; \
>> 215 RUSTC=$(objtree)/$(obj)/test/rustc_sysroot $(CARGO) $(cargo_quiet) \
>> 216 test -Zbuild-std --target $(rustc_host_target) \
>> 217 --manifest-path $(objtree)/$(obj)/test/dummy/Cargo.toml; \
>> 218 rm $(objtree)/$(obj)/test/sysroot/lib/rustlib/$(rustc_host_target)/lib/*; \
>> 219 cp $(objtree)/$(obj)/test/dummy/target/$(rustc_host_target)/debug/deps/* \
>> 220 $(objtree)/$(obj)/test/sysroot/lib/rustlib/$(rustc_host_target)/lib
>> 221
>> 222 rusttest-prepare: FORCE
>> 223 $(call if_changed,rustsysroot)
>> 224
195 rusttest-macros: private rustc_target_flags = 225 rusttest-macros: private rustc_target_flags = --extern proc_macro
196 rusttest-macros: private rustdoc_test_target_f 226 rusttest-macros: private rustdoc_test_target_flags = --crate-type proc-macro
197 rusttest-macros: $(src)/macros/lib.rs FORCE !! 227 rusttest-macros: $(src)/macros/lib.rs rusttest-prepare FORCE
198 +$(call if_changed,rustc_test) !! 228 $(call if_changed,rustc_test)
199 +$(call if_changed,rustdoc_test) !! 229 $(call if_changed,rustdoc_test)
200 230
201 rusttest-kernel: private rustc_target_flags = 231 rusttest-kernel: private rustc_target_flags = --extern alloc \
202 --extern build_error --extern macros --ext 232 --extern build_error --extern macros --extern bindings --extern uapi
203 rusttest-kernel: $(src)/kernel/lib.rs \ !! 233 rusttest-kernel: $(src)/kernel/lib.rs rusttest-prepare \
204 rusttestlib-build_error rusttestlib-macros 234 rusttestlib-build_error rusttestlib-macros rusttestlib-bindings \
205 rusttestlib-uapi FORCE 235 rusttestlib-uapi FORCE
206 +$(call if_changed,rustc_test) !! 236 $(call if_changed,rustc_test)
207 +$(call if_changed,rustc_test_library) !! 237 $(call if_changed,rustc_test_library)
208 238
209 ifdef CONFIG_CC_IS_CLANG 239 ifdef CONFIG_CC_IS_CLANG
210 bindgen_c_flags = $(c_flags) 240 bindgen_c_flags = $(c_flags)
211 else 241 else
212 # bindgen relies on libclang to parse C. Ideal 242 # bindgen relies on libclang to parse C. Ideally, bindgen would support a GCC
213 # plugin backend and/or the Clang driver would 243 # plugin backend and/or the Clang driver would be perfectly compatible with GCC.
214 # 244 #
215 # For the moment, here we are tweaking the fla 245 # For the moment, here we are tweaking the flags on the fly. This is a hack,
216 # and some kernel configurations may not work 246 # and some kernel configurations may not work (e.g. `GCC_PLUGIN_RANDSTRUCT`
217 # if we end up using one of those structs). 247 # if we end up using one of those structs).
218 bindgen_skip_c_flags := -mno-fp-ret-in-387 -mp 248 bindgen_skip_c_flags := -mno-fp-ret-in-387 -mpreferred-stack-boundary=% \
219 -mskip-rax-setup -mgeneral-regs-only - 249 -mskip-rax-setup -mgeneral-regs-only -msign-return-address=% \
220 -mindirect-branch=thunk-extern -mindir 250 -mindirect-branch=thunk-extern -mindirect-branch-register \
221 -mfunction-return=thunk-extern -mrecor 251 -mfunction-return=thunk-extern -mrecord-mcount -mabi=lp64 \
222 -mindirect-branch-cs-prefix -mstack-pr 252 -mindirect-branch-cs-prefix -mstack-protector-guard% -mtraceback=no \
223 -mno-pointers-to-nested-functions -mno 253 -mno-pointers-to-nested-functions -mno-string \
224 -mno-strict-align -mstrict-align \ 254 -mno-strict-align -mstrict-align \
225 -fconserve-stack -falign-jumps=% -fali 255 -fconserve-stack -falign-jumps=% -falign-loops=% \
226 -femit-struct-debug-baseonly -fno-ipa- 256 -femit-struct-debug-baseonly -fno-ipa-cp-clone -fno-ipa-sra \
227 -fno-partial-inlining -fplugin-arg-arm 257 -fno-partial-inlining -fplugin-arg-arm_ssp_per_task_plugin-% \
228 -fno-reorder-blocks -fno-allow-store-d 258 -fno-reorder-blocks -fno-allow-store-data-races -fasan-shadow-offset=% \
229 -fzero-call-used-regs=% -fno-stack-cla 259 -fzero-call-used-regs=% -fno-stack-clash-protection \
230 -fno-inline-functions-called-once -fsa !! 260 -fno-inline-functions-called-once \
231 -fstrict-flex-arrays=% -fmin-function- <<
232 --param=% --param asan-% 261 --param=% --param asan-%
233 262
234 # Derived from `scripts/Makefile.clang`. 263 # Derived from `scripts/Makefile.clang`.
235 BINDGEN_TARGET_x86 := x86_64-linux-gnu 264 BINDGEN_TARGET_x86 := x86_64-linux-gnu
236 BINDGEN_TARGET_arm64 := aarch64-linux-gnu <<
237 BINDGEN_TARGET := $(BINDGEN_TARGET_$( 265 BINDGEN_TARGET := $(BINDGEN_TARGET_$(SRCARCH))
238 266
239 # All warnings are inhibited since GCC builds 267 # All warnings are inhibited since GCC builds are very experimental,
240 # many GCC warnings are not supported by Clang 268 # many GCC warnings are not supported by Clang, they may only appear in
241 # some configurations, with new GCC versions, 269 # some configurations, with new GCC versions, etc.
242 bindgen_extra_c_flags = -w --target=$(BINDGEN_ 270 bindgen_extra_c_flags = -w --target=$(BINDGEN_TARGET)
243 271
244 # Auto variable zero-initialization requires a 272 # Auto variable zero-initialization requires an additional special option with
245 # clang that is going to be removed sometime i 273 # clang that is going to be removed sometime in the future (likely in
246 # clang-18), so make sure to pass this option 274 # clang-18), so make sure to pass this option only if clang supports it
247 # (libclang major version < 16). 275 # (libclang major version < 16).
248 # 276 #
249 # https://github.com/llvm/llvm-project/issues/ 277 # https://github.com/llvm/llvm-project/issues/44842
250 # https://github.com/llvm/llvm-project/blob/ll 278 # https://github.com/llvm/llvm-project/blob/llvmorg-16.0.0-rc2/clang/docs/ReleaseNotes.rst#deprecated-compiler-flags
251 ifdef CONFIG_INIT_STACK_ALL_ZERO 279 ifdef CONFIG_INIT_STACK_ALL_ZERO
252 libclang_maj_ver=$(shell $(BINDGEN) $(srctree) 280 libclang_maj_ver=$(shell $(BINDGEN) $(srctree)/scripts/rust_is_available_bindgen_libclang.h 2>&1 | sed -ne 's/.*clang version \([0-9]*\).*/\1/p')
253 ifeq ($(shell expr $(libclang_maj_ver) \< 16), 281 ifeq ($(shell expr $(libclang_maj_ver) \< 16), 1)
254 bindgen_extra_c_flags += -enable-trivial-auto- 282 bindgen_extra_c_flags += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
255 endif 283 endif
256 endif 284 endif
257 285
258 bindgen_c_flags = $(filter-out $(bindgen_skip_ 286 bindgen_c_flags = $(filter-out $(bindgen_skip_c_flags), $(c_flags)) \
259 $(bindgen_extra_c_flags) 287 $(bindgen_extra_c_flags)
260 endif 288 endif
261 289
262 ifdef CONFIG_LTO 290 ifdef CONFIG_LTO
263 bindgen_c_flags_lto = $(filter-out $(CC_FLAGS_ 291 bindgen_c_flags_lto = $(filter-out $(CC_FLAGS_LTO), $(bindgen_c_flags))
264 else 292 else
265 bindgen_c_flags_lto = $(bindgen_c_flags) 293 bindgen_c_flags_lto = $(bindgen_c_flags)
266 endif 294 endif
267 295
268 bindgen_c_flags_final = $(bindgen_c_flags_lto) 296 bindgen_c_flags_final = $(bindgen_c_flags_lto) -D__BINDGEN__
269 297
270 quiet_cmd_bindgen = BINDGEN $@ 298 quiet_cmd_bindgen = BINDGEN $@
271 cmd_bindgen = \ 299 cmd_bindgen = \
272 $(BINDGEN) $< $(bindgen_target_flags) 300 $(BINDGEN) $< $(bindgen_target_flags) \
273 --use-core --with-derive-defau 301 --use-core --with-derive-default --ctypes-prefix core::ffi --no-layout-tests \
274 --no-debug '.*' --enable-funct !! 302 --no-debug '.*' \
275 -o $@ -- $(bindgen_c_flags_fin !! 303 --size_t-is-usize -o $@ -- $(bindgen_c_flags_final) -DMODULE \
276 $(bindgen_target_cflags) $(bin 304 $(bindgen_target_cflags) $(bindgen_target_extra)
277 305
278 $(obj)/bindings/bindings_generated.rs: private 306 $(obj)/bindings/bindings_generated.rs: private bindgen_target_flags = \
279 $(shell grep -Ev '^#|^$$' $(src)/bindgen_p !! 307 $(shell grep -v '^#\|^$$' $(srctree)/$(src)/bindgen_parameters)
280 $(obj)/bindings/bindings_generated.rs: private <<
281 sed -Ei 's/pub const RUST_CONST_HELPER_([a <<
282 $(obj)/bindings/bindings_generated.rs: $(src)/ 308 $(obj)/bindings/bindings_generated.rs: $(src)/bindings/bindings_helper.h \
283 $(src)/bindgen_parameters FORCE 309 $(src)/bindgen_parameters FORCE
284 $(call if_changed_dep,bindgen) 310 $(call if_changed_dep,bindgen)
285 311
286 $(obj)/uapi/uapi_generated.rs: private bindgen 312 $(obj)/uapi/uapi_generated.rs: private bindgen_target_flags = \
287 $(shell grep -Ev '^#|^$$' $(src)/bindgen_p !! 313 $(shell grep -v '^#\|^$$' $(srctree)/$(src)/bindgen_parameters)
288 $(obj)/uapi/uapi_generated.rs: $(src)/uapi/uap 314 $(obj)/uapi/uapi_generated.rs: $(src)/uapi/uapi_helper.h \
289 $(src)/bindgen_parameters FORCE 315 $(src)/bindgen_parameters FORCE
290 $(call if_changed_dep,bindgen) 316 $(call if_changed_dep,bindgen)
291 317
292 # See `CFLAGS_REMOVE_helpers.o` above. In addi 318 # See `CFLAGS_REMOVE_helpers.o` above. In addition, Clang on C does not warn
293 # with `-Wmissing-declarations` (unlike GCC), 319 # with `-Wmissing-declarations` (unlike GCC), so it is not strictly needed here
294 # given it is `libclang`; but for consistency, 320 # given it is `libclang`; but for consistency, future Clang changes and/or
295 # a potential future GCC backend for `bindgen` 321 # a potential future GCC backend for `bindgen`, we disable it too.
296 $(obj)/bindings/bindings_helpers_generated.rs: 322 $(obj)/bindings/bindings_helpers_generated.rs: private bindgen_target_flags = \
297 --blocklist-type '.*' --allowlist-var '' \ !! 323 --blacklist-type '.*' --whitelist-var '' \
298 --allowlist-function 'rust_helper_.*' !! 324 --whitelist-function 'rust_helper_.*'
299 $(obj)/bindings/bindings_helpers_generated.rs: 325 $(obj)/bindings/bindings_helpers_generated.rs: private bindgen_target_cflags = \
300 -I$(objtree)/$(obj) -Wno-missing-prototype 326 -I$(objtree)/$(obj) -Wno-missing-prototypes -Wno-missing-declarations
301 $(obj)/bindings/bindings_helpers_generated.rs: 327 $(obj)/bindings/bindings_helpers_generated.rs: private bindgen_target_extra = ; \
302 sed -Ei 's/pub fn rust_helper_([a-zA-Z0-9_ 328 sed -Ei 's/pub fn rust_helper_([a-zA-Z0-9_]*)/#[link_name="rust_helper_\1"]\n pub fn \1/g' $@
303 $(obj)/bindings/bindings_helpers_generated.rs: !! 329 $(obj)/bindings/bindings_helpers_generated.rs: $(src)/helpers.c FORCE
304 $(call if_changed_dep,bindgen) 330 $(call if_changed_dep,bindgen)
305 331
306 quiet_cmd_exports = EXPORTS $@ 332 quiet_cmd_exports = EXPORTS $@
307 cmd_exports = \ 333 cmd_exports = \
308 $(NM) -p --defined-only $< \ 334 $(NM) -p --defined-only $< \
309 | awk '$$2~/(T|R|D|B)/ && $$3! !! 335 | grep -E ' (T|R|D) ' | cut -d ' ' -f 3 \
>> 336 | xargs -Isymbol \
>> 337 echo 'EXPORT_SYMBOL_RUST_GPL(symbol);' > $@
310 338
311 $(obj)/exports_core_generated.h: $(obj)/core.o 339 $(obj)/exports_core_generated.h: $(obj)/core.o FORCE
312 $(call if_changed,exports) 340 $(call if_changed,exports)
313 341
314 $(obj)/exports_alloc_generated.h: $(obj)/alloc 342 $(obj)/exports_alloc_generated.h: $(obj)/alloc.o FORCE
315 $(call if_changed,exports) 343 $(call if_changed,exports)
316 344
317 # Even though Rust kernel modules should never <<
318 # symbols from the `bindings` crate and the C <<
319 # because Rust generics and inlined functions <<
320 # in the crate where they are defined. Other h <<
321 # functions, may not be exported, in principle <<
322 # compiler does not guarantee codegen will be <<
323 # function either. Therefore, we export all sy <<
324 # In the future, this may be revisited to redu <<
325 # the compiler is informed about the places co <<
326 $(obj)/exports_helpers_generated.h: $(obj)/hel <<
327 $(call if_changed,exports) <<
328 <<
329 $(obj)/exports_bindings_generated.h: $(obj)/bi 345 $(obj)/exports_bindings_generated.h: $(obj)/bindings.o FORCE
330 $(call if_changed,exports) 346 $(call if_changed,exports)
331 347
332 $(obj)/exports_kernel_generated.h: $(obj)/kern 348 $(obj)/exports_kernel_generated.h: $(obj)/kernel.o FORCE
333 $(call if_changed,exports) 349 $(call if_changed,exports)
334 350
335 quiet_cmd_rustc_procmacro = $(RUSTC_OR_CLIPPY_ 351 quiet_cmd_rustc_procmacro = $(RUSTC_OR_CLIPPY_QUIET) P $@
336 cmd_rustc_procmacro = \ 352 cmd_rustc_procmacro = \
337 $(RUSTC_OR_CLIPPY) $(rust_common_flags 353 $(RUSTC_OR_CLIPPY) $(rust_common_flags) \
338 -Clinker-flavor=gcc -Clinker=$ <<
339 -Clink-args='$(call escsq,$(KB <<
340 --emit=dep-info=$(depfile) --e 354 --emit=dep-info=$(depfile) --emit=link=$@ --extern proc_macro \
341 --crate-type proc-macro \ 355 --crate-type proc-macro \
342 --crate-name $(patsubst lib%.s 356 --crate-name $(patsubst lib%.so,%,$(notdir $@)) $<
343 357
344 # Procedural macros can only be used with the 358 # Procedural macros can only be used with the `rustc` that compiled it.
345 $(obj)/libmacros.so: $(src)/macros/lib.rs FORC !! 359 # Therefore, to get `libmacros.so` automatically recompiled when the compiler
346 +$(call if_changed_dep,rustc_procmacro !! 360 # version changes, we add `core.o` as a dependency (even if it is not needed).
>> 361 $(obj)/libmacros.so: $(src)/macros/lib.rs $(obj)/core.o FORCE
>> 362 $(call if_changed_dep,rustc_procmacro)
347 363
348 quiet_cmd_rustc_library = $(if $(skip_clippy), 364 quiet_cmd_rustc_library = $(if $(skip_clippy),RUSTC,$(RUSTC_OR_CLIPPY_QUIET)) L $@
349 cmd_rustc_library = \ 365 cmd_rustc_library = \
350 OBJTREE=$(abspath $(objtree)) \ 366 OBJTREE=$(abspath $(objtree)) \
351 $(if $(skip_clippy),$(RUSTC),$(RUSTC_O 367 $(if $(skip_clippy),$(RUSTC),$(RUSTC_OR_CLIPPY)) \
352 $(filter-out $(skip_flags),$(r 368 $(filter-out $(skip_flags),$(rust_flags) $(rustc_target_flags)) \
353 --emit=dep-info=$(depfile) --e 369 --emit=dep-info=$(depfile) --emit=obj=$@ \
354 --emit=metadata=$(dir $@)$(pat 370 --emit=metadata=$(dir $@)$(patsubst %.o,lib%.rmeta,$(notdir $@)) \
355 --crate-type rlib -L$(objtree) 371 --crate-type rlib -L$(objtree)/$(obj) \
356 --crate-name $(patsubst %.o,%, 372 --crate-name $(patsubst %.o,%,$(notdir $@)) $< \
357 --sysroot=/dev/null \ !! 373 $(if $(rustc_objcopy),;$(OBJCOPY) $(rustc_objcopy) $@)
358 $(if $(rustc_objcopy),;$(OBJCOPY) $(ru <<
359 $(cmd_objtool) <<
360 374
361 rust-analyzer: 375 rust-analyzer:
362 $(Q)$(srctree)/scripts/generate_rust_a !! 376 $(Q)$(srctree)/scripts/generate_rust_analyzer.py $(srctree) $(objtree) \
363 --cfgs='core=$(core-cfgs)' --c !! 377 $(RUST_LIB_SRC) > $(objtree)/rust-project.json
364 $(realpath $(srctree)) $(realp <<
365 $(rustc_sysroot) $(RUST_LIB_SR <<
366 $(if $(KBUILD_EXTMOD),$(extmod <<
367 378
368 redirect-intrinsics = \ 379 redirect-intrinsics = \
369 __addsf3 __eqsf2 __extendsfdf2 __gesf2 !! 380 __eqsf2 __gesf2 __lesf2 __nesf2 __unordsf2 \
370 __adddf3 __eqdf2 __ledf2 __ltdf2 __mul !! 381 __unorddf2 \
371 __muloti4 __multi3 \ 382 __muloti4 __multi3 \
372 __udivmodti4 __udivti3 __umodti3 383 __udivmodti4 __udivti3 __umodti3
373 384
374 ifneq ($(or $(CONFIG_ARM64),$(and $(CONFIG_RIS 385 ifneq ($(or $(CONFIG_ARM64),$(and $(CONFIG_RISCV),$(CONFIG_64BIT))),)
375 # These intrinsics are defined for ARM 386 # These intrinsics are defined for ARM64 and RISCV64
376 redirect-intrinsics += \ 387 redirect-intrinsics += \
377 __ashrti3 \ 388 __ashrti3 \
378 __ashlti3 __lshrti3 389 __ashlti3 __lshrti3
379 endif 390 endif
380 391
381 define rule_rustc_library <<
382 $(call cmd_and_fixdep,rustc_library) <<
383 $(call cmd,gen_objtooldep) <<
384 endef <<
385 <<
386 $(obj)/core.o: private skip_clippy = 1 392 $(obj)/core.o: private skip_clippy = 1
387 $(obj)/core.o: private skip_flags = -Wunreacha !! 393 $(obj)/core.o: private skip_flags = -Dunreachable_pub
388 $(obj)/core.o: private rustc_objcopy = $(forea 394 $(obj)/core.o: private rustc_objcopy = $(foreach sym,$(redirect-intrinsics),--redefine-sym $(sym)=__rust$(sym))
389 $(obj)/core.o: private rustc_target_flags = $( 395 $(obj)/core.o: private rustc_target_flags = $(core-cfgs)
390 $(obj)/core.o: $(RUST_LIB_SRC)/core/src/lib.rs !! 396 $(obj)/core.o: $(RUST_LIB_SRC)/core/src/lib.rs scripts/target.json FORCE
391 $(wildcard $(objtree)/include/config/RUSTC !! 397 $(call if_changed_dep,rustc_library)
392 +$(call if_changed_rule,rustc_library) <<
393 ifneq ($(or $(CONFIG_X86_64),$(CONFIG_X86_32)) <<
394 $(obj)/core.o: scripts/target.json <<
395 endif <<
396 398
397 $(obj)/compiler_builtins.o: private rustc_objc 399 $(obj)/compiler_builtins.o: private rustc_objcopy = -w -W '__*'
398 $(obj)/compiler_builtins.o: $(src)/compiler_bu 400 $(obj)/compiler_builtins.o: $(src)/compiler_builtins.rs $(obj)/core.o FORCE
399 +$(call if_changed_rule,rustc_library) !! 401 $(call if_changed_dep,rustc_library)
400 402
401 $(obj)/alloc.o: private skip_clippy = 1 403 $(obj)/alloc.o: private skip_clippy = 1
402 $(obj)/alloc.o: private skip_flags = -Wunreach !! 404 $(obj)/alloc.o: private skip_flags = -Dunreachable_pub
403 $(obj)/alloc.o: private rustc_target_flags = $ 405 $(obj)/alloc.o: private rustc_target_flags = $(alloc-cfgs)
404 $(obj)/alloc.o: $(RUST_LIB_SRC)/alloc/src/lib. !! 406 $(obj)/alloc.o: $(src)/alloc/lib.rs $(obj)/compiler_builtins.o FORCE
405 +$(call if_changed_rule,rustc_library) !! 407 $(call if_changed_dep,rustc_library)
406 408
407 $(obj)/build_error.o: $(src)/build_error.rs $( 409 $(obj)/build_error.o: $(src)/build_error.rs $(obj)/compiler_builtins.o FORCE
408 +$(call if_changed_rule,rustc_library) !! 410 $(call if_changed_dep,rustc_library)
409 411
410 $(obj)/bindings.o: $(src)/bindings/lib.rs \ 412 $(obj)/bindings.o: $(src)/bindings/lib.rs \
411 $(obj)/compiler_builtins.o \ 413 $(obj)/compiler_builtins.o \
412 $(obj)/bindings/bindings_generated.rs \ 414 $(obj)/bindings/bindings_generated.rs \
413 $(obj)/bindings/bindings_helpers_generated 415 $(obj)/bindings/bindings_helpers_generated.rs FORCE
414 +$(call if_changed_rule,rustc_library) !! 416 $(call if_changed_dep,rustc_library)
415 417
416 $(obj)/uapi.o: $(src)/uapi/lib.rs \ 418 $(obj)/uapi.o: $(src)/uapi/lib.rs \
417 $(obj)/compiler_builtins.o \ 419 $(obj)/compiler_builtins.o \
418 $(obj)/uapi/uapi_generated.rs FORCE 420 $(obj)/uapi/uapi_generated.rs FORCE
419 +$(call if_changed_rule,rustc_library) !! 421 $(call if_changed_dep,rustc_library)
420 422
421 $(obj)/kernel.o: private rustc_target_flags = 423 $(obj)/kernel.o: private rustc_target_flags = --extern alloc \
422 --extern build_error --extern macros --ext 424 --extern build_error --extern macros --extern bindings --extern uapi
423 $(obj)/kernel.o: $(src)/kernel/lib.rs $(obj)/a 425 $(obj)/kernel.o: $(src)/kernel/lib.rs $(obj)/alloc.o $(obj)/build_error.o \
424 $(obj)/libmacros.so $(obj)/bindings.o $(ob 426 $(obj)/libmacros.so $(obj)/bindings.o $(obj)/uapi.o FORCE
425 +$(call if_changed_rule,rustc_library) !! 427 $(call if_changed_dep,rustc_library)
426 428
427 endif # CONFIG_RUST 429 endif # CONFIG_RUST
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