Commit | Line | Data |
---|---|---|
b2441318 | 1 | # SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | # ========================================================================== |
3 | # Building | |
4 | # ========================================================================== | |
5 | ||
6 | src := $(obj) | |
7 | ||
4f193362 | 8 | PHONY := __build |
1da177e4 LT |
9 | __build: |
10 | ||
d72e5edb SR |
11 | # Init all relevant variables used in kbuild files so |
12 | # 1) they have correct type | |
13 | # 2) they do not inherit any value from the environment | |
14 | obj-y := | |
15 | obj-m := | |
16 | lib-y := | |
17 | lib-m := | |
18 | always := | |
19 | targets := | |
20 | subdir-y := | |
21 | subdir-m := | |
22 | EXTRA_AFLAGS := | |
23 | EXTRA_CFLAGS := | |
24 | EXTRA_CPPFLAGS := | |
25 | EXTRA_LDFLAGS := | |
f77bf014 SR |
26 | asflags-y := |
27 | ccflags-y := | |
28 | cppflags-y := | |
29 | ldflags-y := | |
d72e5edb | 30 | |
720097d8 SR |
31 | subdir-asflags-y := |
32 | subdir-ccflags-y := | |
33 | ||
3156fd05 | 34 | # Read auto.conf if it exists, otherwise ignore |
c955ccaf | 35 | -include include/config/auto.conf |
1da177e4 | 36 | |
20a468b5 SR |
37 | include scripts/Kbuild.include |
38 | ||
3156fd05 | 39 | # For backward compatibility check that these variables do not change |
0c53c8e6 SR |
40 | save-cflags := $(CFLAGS) |
41 | ||
2a691470 | 42 | # The filename Kbuild has precedence over Makefile |
db8c1a7b | 43 | kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src)) |
0c53c8e6 SR |
44 | kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile) |
45 | include $(kbuild-file) | |
46 | ||
47 | # If the save-* variables changed error out | |
48 | ifeq ($(KBUILD_NOPEDANTIC),) | |
49 | ifneq ("$(save-cflags)","$(CFLAGS)") | |
49c57d25 | 50 | $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use ccflags-y) |
0c53c8e6 SR |
51 | endif |
52 | endif | |
4a5838ad | 53 | |
1da177e4 LT |
54 | include scripts/Makefile.lib |
55 | ||
56 | ifdef host-progs | |
57 | ifneq ($(hostprogs-y),$(host-progs)) | |
58 | $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!) | |
59 | hostprogs-y += $(host-progs) | |
60 | endif | |
61 | endif | |
62 | ||
3156fd05 | 63 | # Do not include host rules unless needed |
24403874 | 64 | ifneq ($(hostprogs-y)$(hostprogs-m)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-m),) |
1da177e4 LT |
65 | include scripts/Makefile.host |
66 | endif | |
67 | ||
68 | ifneq ($(KBUILD_SRC),) | |
69 | # Create output directory if not already present | |
70 | _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj)) | |
71 | ||
72 | # Create directories for object files if directory does not exist | |
73 | # Needed when obj-y := dir/file.o syntax is used | |
74 | _dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d))) | |
75 | endif | |
76 | ||
1da177e4 LT |
77 | ifndef obj |
78 | $(warning kbuild: Makefile.build is included improperly) | |
79 | endif | |
80 | ||
81 | # =========================================================================== | |
82 | ||
a4954fd7 | 83 | ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),) |
1da177e4 | 84 | lib-target := $(obj)/lib.a |
7f2084fa | 85 | obj-y += $(obj)/lib-ksyms.o |
1da177e4 LT |
86 | endif |
87 | ||
a4954fd7 | 88 | ifneq ($(strip $(obj-y) $(obj-m) $(obj-) $(subdir-m) $(lib-target)),) |
1da177e4 LT |
89 | builtin-target := $(obj)/built-in.o |
90 | endif | |
91 | ||
551559e1 TH |
92 | modorder-target := $(obj)/modules.order |
93 | ||
1da177e4 LT |
94 | # We keep a list of all modules in $(MODVERDIR) |
95 | ||
96 | __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \ | |
551559e1 | 97 | $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \ |
1da177e4 LT |
98 | $(subdir-ym) $(always) |
99 | @: | |
100 | ||
101 | # Linus' kernel sanity checking tool | |
102 | ifneq ($(KBUILD_CHECKSRC),0) | |
103 | ifeq ($(KBUILD_CHECKSRC),2) | |
104 | quiet_cmd_force_checksrc = CHECK $< | |
105 | cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; | |
106 | else | |
107 | quiet_cmd_checksrc = CHECK $< | |
108 | cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; | |
109 | endif | |
110 | endif | |
111 | ||
91341d4b SR |
112 | # Do section mismatch analysis for each module/built-in.o |
113 | ifdef CONFIG_DEBUG_SECTION_MISMATCH | |
114 | cmd_secanalysis = ; scripts/mod/modpost $@ | |
115 | endif | |
1da177e4 LT |
116 | |
117 | # Compile C sources (.c) | |
118 | # --------------------------------------------------------------------------- | |
119 | ||
120 | # Default is built-in, unless we know otherwise | |
6588169d SR |
121 | modkern_cflags = \ |
122 | $(if $(part-of-module), \ | |
123 | $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \ | |
80c00ba9 | 124 | $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL)) |
1da177e4 LT |
125 | quiet_modtag := $(empty) $(empty) |
126 | ||
18c167fd SL |
127 | $(real-objs-m) : part-of-module := y |
128 | $(real-objs-m:.o=.i) : part-of-module := y | |
129 | $(real-objs-m:.o=.s) : part-of-module := y | |
130 | $(real-objs-m:.o=.lst): part-of-module := y | |
1da177e4 LT |
131 | |
132 | $(real-objs-m) : quiet_modtag := [M] | |
133 | $(real-objs-m:.o=.i) : quiet_modtag := [M] | |
134 | $(real-objs-m:.o=.s) : quiet_modtag := [M] | |
135 | $(real-objs-m:.o=.lst): quiet_modtag := [M] | |
136 | ||
137 | $(obj-m) : quiet_modtag := [M] | |
138 | ||
139 | # Default for not multi-part modules | |
5e8d780d | 140 | modname = $(basetarget) |
1da177e4 LT |
141 | |
142 | $(multi-objs-m) : modname = $(modname-multi) | |
143 | $(multi-objs-m:.o=.i) : modname = $(modname-multi) | |
144 | $(multi-objs-m:.o=.s) : modname = $(modname-multi) | |
145 | $(multi-objs-m:.o=.lst) : modname = $(modname-multi) | |
146 | $(multi-objs-y) : modname = $(modname-multi) | |
147 | $(multi-objs-y:.o=.i) : modname = $(modname-multi) | |
148 | $(multi-objs-y:.o=.s) : modname = $(modname-multi) | |
149 | $(multi-objs-y:.o=.lst) : modname = $(modname-multi) | |
150 | ||
151 | quiet_cmd_cc_s_c = CC $(quiet_modtag) $@ | |
1e64ff42 | 152 | cmd_cc_s_c = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $< |
1da177e4 | 153 | |
767e581d | 154 | $(obj)/%.s: $(src)/%.c FORCE |
1da177e4 LT |
155 | $(call if_changed_dep,cc_s_c) |
156 | ||
23d43848 MY |
157 | quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@ |
158 | cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $< | |
1da177e4 | 159 | |
767e581d | 160 | $(obj)/%.i: $(src)/%.c FORCE |
23d43848 | 161 | $(call if_changed_dep,cpp_i_c) |
1da177e4 | 162 | |
4efca4ed NP |
163 | # These mirror gensymtypes_S and co below, keep them in synch. |
164 | cmd_gensymtypes_c = \ | |
37a8d9f6 | 165 | $(CPP) -D__GENKSYMS__ $(c_flags) $< | \ |
d70f82ac JH |
166 | $(GENKSYMS) $(if $(1), -T $(2)) \ |
167 | $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \ | |
56067812 | 168 | $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \ |
37a8d9f6 | 169 | $(if $(KBUILD_PRESERVE),-p) \ |
e26d6b83 | 170 | -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null)) |
37a8d9f6 | 171 | |
15fde675 | 172 | quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@ |
37a8d9f6 SR |
173 | cmd_cc_symtypes_c = \ |
174 | set -e; \ | |
4efca4ed | 175 | $(call cmd_gensymtypes_c,true,$@) >/dev/null; \ |
37a8d9f6 | 176 | test -s $@ || rm -f $@ |
15fde675 | 177 | |
767e581d | 178 | $(obj)/%.symtypes : $(src)/%.c FORCE |
64e6c1e1 | 179 | $(call cmd,cc_symtypes_c) |
15fde675 | 180 | |
433db3e2 VT |
181 | # LLVM assembly |
182 | # Generate .ll files from .c | |
183 | quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@ | |
184 | cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $< | |
185 | ||
186 | $(obj)/%.ll: $(src)/%.c FORCE | |
187 | $(call if_changed_dep,cc_ll_c) | |
188 | ||
1da177e4 LT |
189 | # C (.c) files |
190 | # The C file is compiled and updated dependency information is generated. | |
191 | # (See cmd_cc_o_c + relevant part of rule_cc_o_c) | |
192 | ||
193 | quiet_cmd_cc_o_c = CC $(quiet_modtag) $@ | |
194 | ||
195 | ifndef CONFIG_MODVERSIONS | |
196 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< | |
197 | ||
198 | else | |
199 | # When module versioning is enabled the following steps are executed: | |
2ea03891 SR |
200 | # o compile a .tmp_<file>.o from <file>.c |
201 | # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does | |
202 | # not export symbols, we just rename .tmp_<file>.o to <file>.o and | |
1da177e4 LT |
203 | # are done. |
204 | # o otherwise, we calculate symbol versions using the good old | |
205 | # genksyms on the preprocessed source and postprocess them in a way | |
2ea03891 SR |
206 | # that they are usable as a linker script |
207 | # o generate <file>.o from .tmp_<file>.o using the linker to | |
208 | # replace the unresolved symbols __crc_exported_symbol with | |
209 | # the actual value of the checksum generated by genksyms | |
1da177e4 | 210 | |
2ea03891 | 211 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $< |
4efca4ed | 212 | |
af1f94d0 ST |
213 | ifdef CONFIG_LTO_CLANG |
214 | # Generate .o.symversions files for each .o with exported symbols, and link these | |
215 | # to the kernel and/or modules at the end. | |
216 | cmd_modversions_c = \ | |
217 | if $(OBJDUMP) -h $(@D)/.tmp_$(@F) >/dev/null 2>/dev/null; then \ | |
218 | if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \ | |
219 | $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ | |
220 | > $(@D)/$(@F).symversions; \ | |
221 | fi; \ | |
222 | else \ | |
223 | if $(LLVM_DIS) -o=- $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \ | |
224 | $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ | |
225 | > $(@D)/$(@F).symversions; \ | |
226 | fi; \ | |
227 | fi; \ | |
228 | mv -f $(@D)/.tmp_$(@F) $@; | |
229 | else | |
4efca4ed | 230 | cmd_modversions_c = \ |
e26d6b83 | 231 | if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \ |
4efca4ed | 232 | $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ |
e26d6b83 DZ |
233 | > $(@D)/.tmp_$(@F:.o=.ver); \ |
234 | \ | |
235 | $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \ | |
236 | -T $(@D)/.tmp_$(@F:.o=.ver); \ | |
237 | rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \ | |
238 | else \ | |
239 | mv -f $(@D)/.tmp_$(@F) $@; \ | |
1da177e4 LT |
240 | fi; |
241 | endif | |
af1f94d0 | 242 | endif |
1da177e4 | 243 | |
8da3821b | 244 | ifdef CONFIG_FTRACE_MCOUNT_RECORD |
72441cb1 | 245 | ifdef BUILD_C_RECORDMCOUNT |
85356f80 SR |
246 | ifeq ("$(origin RECORDMCOUNT_WARN)", "command line") |
247 | RECORDMCOUNT_FLAGS = -w | |
248 | endif | |
9abcee51 ST |
249 | |
250 | ifdef CONFIG_LTO_CLANG | |
251 | # With LTO, we postpone running recordmcount until after the LTO link step, so | |
252 | # let's export the parameters for the link script. | |
253 | export RECORDMCOUNT_FLAGS | |
254 | else | |
d7b4d6de SR |
255 | # Due to recursion, we must skip empty.o. |
256 | # The empty.o file is created in the make process in order to determine | |
312a3d09 C |
257 | # the target endianness and word size. It is made before all other C |
258 | # files, including recordmcount. | |
45677454 WZ |
259 | sub_cmd_record_mcount = \ |
260 | if [ $(@) != "scripts/mod/empty.o" ]; then \ | |
85356f80 | 261 | $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \ |
45677454 | 262 | fi; |
9abcee51 ST |
263 | endif |
264 | ||
d6971822 MM |
265 | recordmcount_source := $(srctree)/scripts/recordmcount.c \ |
266 | $(srctree)/scripts/recordmcount.h | |
9abcee51 | 267 | else # !BUILD_C_RECORDMCOUNT |
45677454 | 268 | sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \ |
e6299d26 | 269 | "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \ |
b3acf29a | 270 | "$(if $(CONFIG_64BIT),64,32)" \ |
487467e7 | 271 | "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)" \ |
f9810a82 | 272 | "$(LD)" "$(NM)" "$(RM)" "$(MV)" \ |
18c167fd | 273 | "$(if $(part-of-module),1,0)" "$(@)"; |
9abcee51 | 274 | |
d6971822 | 275 | recordmcount_source := $(srctree)/scripts/recordmcount.pl |
312a3d09 | 276 | endif # BUILD_C_RECORDMCOUNT |
9abcee51 ST |
277 | |
278 | ifndef CONFIG_LTO_CLANG | |
c0a80c0c HC |
279 | cmd_record_mcount = \ |
280 | if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" = \ | |
281 | "$(CC_FLAGS_FTRACE)" ]; then \ | |
45677454 WZ |
282 | $(sub_cmd_record_mcount) \ |
283 | fi; | |
9abcee51 | 284 | endif |
312a3d09 | 285 | endif # CONFIG_FTRACE_MCOUNT_RECORD |
8da3821b | 286 | |
b9ab5ebb | 287 | ifdef CONFIG_STACK_VALIDATION |
3b27a0c8 | 288 | ifneq ($(SKIP_STACK_VALIDATION),1) |
b9ab5ebb JP |
289 | |
290 | __objtool_obj := $(objtree)/tools/objtool/objtool | |
291 | ||
8af220c9 | 292 | objtool_args = $(if $(CONFIG_UNWINDER_ORC),orc generate,check) |
ee9f8fce | 293 | |
a69898c9 PZ |
294 | objtool_args += $(if $(part-of-module), --module,) |
295 | ||
b9ab5ebb JP |
296 | ifndef CONFIG_FRAME_POINTER |
297 | objtool_args += --no-fp | |
298 | endif | |
867ac9d7 JP |
299 | ifdef CONFIG_GCOV_KERNEL |
300 | objtool_args += --no-unreachable | |
da541b20 JP |
301 | else |
302 | objtool_args += $(call cc-ifversion, -lt, 0405, --no-unreachable) | |
867ac9d7 | 303 | endif |
e6993149 PZ |
304 | ifdef CONFIG_RETPOLINE |
305 | objtool_args += --retpoline | |
306 | endif | |
307 | ||
b9ab5ebb | 308 | |
f41b2d7e JP |
309 | ifdef CONFIG_MODVERSIONS |
310 | objtool_o = $(@D)/.tmp_$(@F) | |
311 | else | |
312 | objtool_o = $(@) | |
313 | endif | |
314 | ||
b9ab5ebb JP |
315 | # 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory |
316 | # 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file | |
317 | # 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file | |
318 | cmd_objtool = $(if $(patsubst y%,, \ | |
319 | $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \ | |
f41b2d7e | 320 | $(__objtool_obj) $(objtool_args) "$(objtool_o)";) |
b9ab5ebb JP |
321 | objtool_obj = $(if $(patsubst y%,, \ |
322 | $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \ | |
323 | $(__objtool_obj)) | |
324 | ||
3b27a0c8 | 325 | endif # SKIP_STACK_VALIDATION |
b9ab5ebb JP |
326 | endif # CONFIG_STACK_VALIDATION |
327 | ||
ee9f8fce JP |
328 | # Rebuild all objects when objtool changes, or is enabled/disabled. |
329 | objtool_dep = $(objtool_obj) \ | |
330 | $(wildcard include/config/orc/unwinder.h \ | |
331 | include/config/stack/validation.h) | |
332 | ||
1da177e4 | 333 | define rule_cc_o_c |
6176aa9a | 334 | $(call echo-cmd,checksrc) $(cmd_checksrc) \ |
e4aca459 | 335 | $(call cmd_and_fixdep,cc_o_c) \ |
e8a3118e | 336 | $(call echo-cmd,objtool) $(cmd_objtool) \ |
f41b2d7e | 337 | $(cmd_modversions_c) \ |
e4aca459 | 338 | $(call echo-cmd,record_mcount) $(cmd_record_mcount) |
1da177e4 LT |
339 | endef |
340 | ||
b9ab5ebb | 341 | define rule_as_o_S |
e4aca459 | 342 | $(call cmd_and_fixdep,as_o_S) \ |
f41b2d7e JP |
343 | $(call echo-cmd,objtool) $(cmd_objtool) \ |
344 | $(cmd_modversions_S) | |
b9ab5ebb JP |
345 | endef |
346 | ||
9895c03d NP |
347 | # List module undefined symbols (or empty line if not enabled) |
348 | ifdef CONFIG_TRIM_UNUSED_KSYMS | |
349 | cmd_undef_syms = $(NM) $@ | sed -n 's/^ \+U //p' | xargs echo | |
350 | else | |
351 | cmd_undef_syms = echo | |
352 | endif | |
353 | ||
1da177e4 | 354 | # Built-in and composite module parts |
ee9f8fce | 355 | $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE |
1da177e4 LT |
356 | $(call cmd,force_checksrc) |
357 | $(call if_changed_rule,cc_o_c) | |
358 | ||
359 | # Single-part modules are special since we need to mark them in $(MODVERDIR) | |
360 | ||
ee9f8fce | 361 | $(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE |
1da177e4 LT |
362 | $(call cmd,force_checksrc) |
363 | $(call if_changed_rule,cc_o_c) | |
9895c03d NP |
364 | @{ echo $(@:.o=.ko); echo $@; \ |
365 | $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod) | |
1da177e4 LT |
366 | |
367 | quiet_cmd_cc_lst_c = MKLST $@ | |
368 | cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \ | |
369 | $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \ | |
370 | System.map $(OBJDUMP) > $@ | |
371 | ||
767e581d | 372 | $(obj)/%.lst: $(src)/%.c FORCE |
1da177e4 LT |
373 | $(call if_changed_dep,cc_lst_c) |
374 | ||
375 | # Compile assembler sources (.S) | |
376 | # --------------------------------------------------------------------------- | |
377 | ||
80c00ba9 | 378 | modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL) |
1da177e4 | 379 | |
6588169d SR |
380 | $(real-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE) |
381 | $(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE) | |
1da177e4 | 382 | |
4efca4ed NP |
383 | # .S file exports must have their C prototypes defined in asm/asm-prototypes.h |
384 | # or a file that it includes, in order to get versioned symbols. We build a | |
385 | # dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from | |
386 | # the .S file (with trailing ';'), and run genksyms on that, to extract vers. | |
387 | # | |
388 | # This is convoluted. The .S file must first be preprocessed to run guards and | |
389 | # expand names, then the resulting exports must be constructed into plain | |
390 | # EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed | |
391 | # to make the genksyms input. | |
392 | # | |
393 | # These mirror gensymtypes_c and co above, keep them in synch. | |
394 | cmd_gensymtypes_S = \ | |
395 | (echo "\#include <linux/kernel.h>" ; \ | |
396 | echo "\#include <asm/asm-prototypes.h>" ; \ | |
397 | $(CPP) $(a_flags) $< | \ | |
cc6acc11 NP |
398 | grep "\<___EXPORT_SYMBOL\>" | \ |
399 | sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ) | \ | |
4efca4ed NP |
400 | $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | \ |
401 | $(GENKSYMS) $(if $(1), -T $(2)) \ | |
402 | $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \ | |
56067812 | 403 | $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \ |
4efca4ed NP |
404 | $(if $(KBUILD_PRESERVE),-p) \ |
405 | -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null)) | |
406 | ||
407 | quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@ | |
408 | cmd_cc_symtypes_S = \ | |
409 | set -e; \ | |
410 | $(call cmd_gensymtypes_S,true,$@) >/dev/null; \ | |
411 | test -s $@ || rm -f $@ | |
412 | ||
413 | $(obj)/%.symtypes : $(src)/%.S FORCE | |
414 | $(call cmd,cc_symtypes_S) | |
415 | ||
416 | ||
e0f41e52 MY |
417 | quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@ |
418 | cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $< | |
1da177e4 | 419 | |
767e581d | 420 | $(obj)/%.s: $(src)/%.S FORCE |
e0f41e52 | 421 | $(call if_changed_dep,cpp_s_S) |
1da177e4 LT |
422 | |
423 | quiet_cmd_as_o_S = AS $(quiet_modtag) $@ | |
4efca4ed NP |
424 | |
425 | ifndef CONFIG_MODVERSIONS | |
426 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< | |
427 | ||
428 | else | |
429 | ||
430 | ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h) | |
431 | ||
432 | ifeq ($(ASM_PROTOTYPES),) | |
433 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< | |
434 | ||
435 | else | |
436 | ||
437 | # versioning matches the C process described above, with difference that | |
438 | # we parse asm-prototypes.h C header to get function definitions. | |
439 | ||
440 | cmd_as_o_S = $(CC) $(a_flags) -c -o $(@D)/.tmp_$(@F) $< | |
441 | ||
442 | cmd_modversions_S = \ | |
443 | if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \ | |
444 | $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ | |
445 | > $(@D)/.tmp_$(@F:.o=.ver); \ | |
446 | \ | |
447 | $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \ | |
448 | -T $(@D)/.tmp_$(@F:.o=.ver); \ | |
449 | rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \ | |
450 | else \ | |
451 | mv -f $(@D)/.tmp_$(@F) $@; \ | |
452 | fi; | |
453 | endif | |
454 | endif | |
1da177e4 | 455 | |
ee9f8fce | 456 | $(obj)/%.o: $(src)/%.S $(objtool_dep) FORCE |
b9ab5ebb | 457 | $(call if_changed_rule,as_o_S) |
1da177e4 LT |
458 | |
459 | targets += $(real-objs-y) $(real-objs-m) $(lib-y) | |
460 | targets += $(extra-y) $(MAKECMDGOALS) $(always) | |
461 | ||
462 | # Linker scripts preprocessor (.lds.S -> .lds) | |
463 | # --------------------------------------------------------------------------- | |
464 | quiet_cmd_cpp_lds_S = LDS $@ | |
5cb0512c | 465 | cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \ |
42f29a25 | 466 | -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $< |
1da177e4 | 467 | |
767e581d | 468 | $(obj)/%.lds: $(src)/%.lds.S FORCE |
1da177e4 LT |
469 | $(call if_changed_dep,cpp_lds_S) |
470 | ||
4520c6a4 DH |
471 | # ASN.1 grammar |
472 | # --------------------------------------------------------------------------- | |
473 | quiet_cmd_asn1_compiler = ASN.1 $@ | |
474 | cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \ | |
475 | $(subst .h,.c,$@) $(subst .c,.h,$@) | |
476 | ||
477 | .PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h | |
478 | ||
479 | $(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler | |
480 | $(call cmd,asn1_compiler) | |
481 | ||
1da177e4 LT |
482 | # Build the compiled-in targets |
483 | # --------------------------------------------------------------------------- | |
484 | ||
485 | # To build objects in subdirs, we need to descend into the directories | |
486 | $(sort $(subdir-obj-y)): $(subdir-ym) ; | |
487 | ||
488 | # | |
489 | # Rule to compile a set of .o files into one .o file | |
490 | # | |
491 | ifdef builtin-target | |
a5967db9 | 492 | |
af1f94d0 ST |
493 | ifdef CONFIG_LTO_CLANG |
494 | ifdef CONFIG_MODVERSIONS | |
495 | # combine symversions for later processing | |
496 | update_lto_symversions = \ | |
497 | rm -f $@.symversions; \ | |
498 | for i in $(filter-out FORCE,$^); do \ | |
499 | if [ -f $$i.symversions ]; then \ | |
500 | cat $$i.symversions \ | |
501 | >> $@.symversions; \ | |
502 | fi; \ | |
503 | done; | |
504 | endif | |
505 | # rebuild the symbol table with llvm-ar to include IR files | |
506 | update_lto_symtable = ; \ | |
507 | mv -f $@ $@.tmp; \ | |
508 | $(LLVM_AR) rcsT$(KBUILD_ARFLAGS) $@ \ | |
509 | $$($(AR) t $@.tmp); \ | |
510 | rm -f $@.tmp | |
511 | endif | |
512 | ||
a5967db9 | 513 | ifdef CONFIG_THIN_ARCHIVES |
af1f94d0 ST |
514 | cmd_make_builtin = $(update_lto_symversions) \ |
515 | rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) | |
9a6cfca4 | 516 | cmd_make_empty_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) |
a5967db9 SR |
517 | quiet_cmd_link_o_target = AR $@ |
518 | else | |
519 | cmd_make_builtin = $(LD) $(ld_flags) -r -o | |
520 | cmd_make_empty_builtin = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) | |
521 | quiet_cmd_link_o_target = LD $@ | |
522 | endif | |
523 | ||
1da177e4 LT |
524 | # If the list of objects to link is empty, just create an empty built-in.o |
525 | cmd_link_o_target = $(if $(strip $(obj-y)),\ | |
a5967db9 | 526 | $(cmd_make_builtin) $@ $(filter $(obj-y), $^) \ |
91341d4b | 527 | $(cmd_secanalysis),\ |
a5967db9 | 528 | $(cmd_make_empty_builtin) $@) |
1da177e4 LT |
529 | |
530 | $(builtin-target): $(obj-y) FORCE | |
531 | $(call if_changed,link_o_target) | |
532 | ||
533 | targets += $(builtin-target) | |
534 | endif # builtin-target | |
535 | ||
551559e1 TH |
536 | # |
537 | # Rule to create modules.order file | |
538 | # | |
539 | # Create commands to either record .ko file or cat modules.order from | |
540 | # a subdirectory | |
541 | modorder-cmds = \ | |
542 | $(foreach m, $(modorder), \ | |
543 | $(if $(filter %/modules.order, $m), \ | |
544 | cat $m;, echo kernel/$m;)) | |
545 | ||
546 | $(modorder-target): $(subdir-ym) FORCE | |
547 | $(Q)(cat /dev/null; $(modorder-cmds)) > $@ | |
548 | ||
1da177e4 LT |
549 | # |
550 | # Rule to compile a set of .o files into one .a file | |
551 | # | |
552 | ifdef lib-target | |
553 | quiet_cmd_link_l_target = AR $@ | |
a5967db9 SR |
554 | |
555 | ifdef CONFIG_THIN_ARCHIVES | |
af1f94d0 ST |
556 | cmd_link_l_target = \ |
557 | $(update_lto_symversions) \ | |
558 | rm -f $@; \ | |
559 | $(AR) rcsTP$(KBUILD_ARFLAGS) $@ $(lib-y) \ | |
560 | $(update_lto_symtable) | |
a5967db9 SR |
561 | else |
562 | cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y) | |
563 | endif | |
1da177e4 LT |
564 | |
565 | $(lib-target): $(lib-y) FORCE | |
566 | $(call if_changed,link_l_target) | |
567 | ||
568 | targets += $(lib-target) | |
7f2084fa AV |
569 | |
570 | dummy-object = $(obj)/.lib_exports.o | |
571 | ksyms-lds = $(dot-target).lds | |
572 | ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX | |
573 | ref_prefix = EXTERN(_ | |
574 | else | |
575 | ref_prefix = EXTERN( | |
576 | endif | |
577 | ||
af1f94d0 ST |
578 | filter_export_list = sed -ne '/___ksymtab/s/.*+\([^ "]*\).*/$(ref_prefix)\1)/p' |
579 | link_export_list = rm -f $(dummy-object);\ | |
9da2f584 | 580 | echo | $(CC) $(a_flags) -c -o $(dummy-object) -x assembler -;\ |
7f2084fa AV |
581 | $(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\ |
582 | rm $(dummy-object) $(ksyms-lds) | |
583 | ||
af1f94d0 ST |
584 | quiet_cmd_export_list = EXPORTS $@ |
585 | ||
586 | ifdef CONFIG_LTO_CLANG | |
587 | # objdump doesn't understand IR files and llvm-dis doesn't support archives, | |
588 | # so we'll walk through each file in the archive separately | |
589 | cmd_export_list = \ | |
590 | rm -f $(ksyms-lds); \ | |
591 | for o in $$($(AR) t $<); do \ | |
592 | if $(OBJDUMP) -h $$o >/dev/null 2>/dev/null; then \ | |
593 | $(OBJDUMP) -h $$o | \ | |
594 | $(filter_export_list) \ | |
595 | >>$(ksyms-lds); \ | |
596 | else \ | |
597 | $(LLVM_DIS) -o=- $$o | \ | |
598 | $(filter_export_list) \ | |
599 | >>$(ksyms-lds); \ | |
600 | fi; \ | |
601 | done; \ | |
602 | $(link_export_list) | |
603 | else | |
604 | cmd_export_list = $(OBJDUMP) -h $< | $(filter_export_list) >$(ksyms-lds); \ | |
605 | $(link_export_list) | |
606 | endif | |
607 | ||
7f2084fa AV |
608 | $(obj)/lib-ksyms.o: $(lib-target) FORCE |
609 | $(call if_changed,export_list) | |
989cea5c NP |
610 | |
611 | targets += $(obj)/lib-ksyms.o | |
612 | ||
1da177e4 LT |
613 | endif |
614 | ||
615 | # | |
616 | # Rule to link composite objects | |
617 | # | |
618 | # Composite objects are specified in kbuild makefile as follows: | |
619 | # <composite-object>-objs := <list of .o files> | |
620 | # or | |
621 | # <composite-object>-y := <list of .o files> | |
cf4f2193 MM |
622 | # or |
623 | # <composite-object>-m := <list of .o files> | |
624 | # The -m syntax only works if <composite object> is a module | |
1da177e4 LT |
625 | link_multi_deps = \ |
626 | $(filter $(addprefix $(obj)/, \ | |
627 | $($(subst $(obj)/,,$(@:.o=-objs))) \ | |
cf4f2193 MM |
628 | $($(subst $(obj)/,,$(@:.o=-y))) \ |
629 | $($(subst $(obj)/,,$(@:.o=-m)))), $^) | |
38385f8f | 630 | |
fe026a85 NP |
631 | cmd_link_multi-link = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis) |
632 | ||
633 | ifdef CONFIG_THIN_ARCHIVES | |
634 | quiet_cmd_link_multi-y = AR $@ | |
af1f94d0 ST |
635 | cmd_link_multi-y = $(update_lto_symversions) \ |
636 | rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) $@ $(link_multi_deps) \ | |
637 | $(update_lto_symtable) | |
fe026a85 NP |
638 | else |
639 | quiet_cmd_link_multi-y = LD $@ | |
640 | cmd_link_multi-y = $(cmd_link_multi-link) | |
641 | endif | |
1da177e4 LT |
642 | |
643 | quiet_cmd_link_multi-m = LD [M] $@ | |
af1f94d0 ST |
644 | |
645 | ifdef CONFIG_LTO_CLANG | |
646 | # don't compile IR until needed | |
647 | cmd_link_multi-m = $(cmd_link_multi-y) | |
648 | else | |
649 | cmd_link_multi-m = $(cmd_link_multi-link) | |
650 | endif | |
1da177e4 | 651 | |
c8589d1e | 652 | $(multi-used-y): FORCE |
1da177e4 LT |
653 | $(call if_changed,link_multi-y) |
654 | ||
c8589d1e | 655 | $(multi-used-m): FORCE |
1da177e4 | 656 | $(call if_changed,link_multi-m) |
9895c03d NP |
657 | @{ echo $(@:.o=.ko); echo $(link_multi_deps); \ |
658 | $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod) | |
af1f94d0 ST |
659 | |
660 | $(call multi_depend, $(multi-used-y), .o, -objs -y) | |
cf4f2193 | 661 | $(call multi_depend, $(multi-used-m), .o, -objs -y -m) |
1da177e4 LT |
662 | |
663 | targets += $(multi-used-y) $(multi-used-m) | |
664 | ||
665 | ||
666 | # Descending | |
667 | # --------------------------------------------------------------------------- | |
668 | ||
4f193362 | 669 | PHONY += $(subdir-ym) |
1da177e4 LT |
670 | $(subdir-ym): |
671 | $(Q)$(MAKE) $(build)=$@ | |
672 | ||
673 | # Add FORCE to the prequisites of a target to force it to be always rebuilt. | |
674 | # --------------------------------------------------------------------------- | |
675 | ||
4f193362 | 676 | PHONY += FORCE |
1da177e4 LT |
677 | |
678 | FORCE: | |
679 | ||
680 | # Read all saved command lines and dependencies for the $(targets) we | |
681 | # may be building above, using $(if_changed{,_dep}). As an | |
682 | # optimization, we don't need to read them if the target does not | |
683 | # exist, we will rebuild anyway in that case. | |
684 | ||
685 | targets := $(wildcard $(sort $(targets))) | |
686 | cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) | |
687 | ||
688 | ifneq ($(cmd_files),) | |
689 | include $(cmd_files) | |
690 | endif | |
4f193362 | 691 | |
4f193362 PS |
692 | # Declare the contents of the .PHONY variable as phony. We keep that |
693 | # information in a variable se we can use it in if_changed and friends. | |
694 | ||
695 | .PHONY: $(PHONY) |