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Commit | Line | Data |
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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 | ||
1da177e4 LT |
68 | ifndef obj |
69 | $(warning kbuild: Makefile.build is included improperly) | |
70 | endif | |
71 | ||
72 | # =========================================================================== | |
73 | ||
a4954fd7 | 74 | ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),) |
1da177e4 | 75 | lib-target := $(obj)/lib.a |
7f2084fa | 76 | obj-y += $(obj)/lib-ksyms.o |
1da177e4 LT |
77 | endif |
78 | ||
f7adc312 | 79 | ifneq ($(strip $(obj-y) $(need-builtin)),) |
1da177e4 LT |
80 | builtin-target := $(obj)/built-in.o |
81 | endif | |
82 | ||
551559e1 TH |
83 | modorder-target := $(obj)/modules.order |
84 | ||
1da177e4 LT |
85 | # We keep a list of all modules in $(MODVERDIR) |
86 | ||
87 | __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \ | |
551559e1 | 88 | $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \ |
1da177e4 LT |
89 | $(subdir-ym) $(always) |
90 | @: | |
91 | ||
92 | # Linus' kernel sanity checking tool | |
93 | ifneq ($(KBUILD_CHECKSRC),0) | |
94 | ifeq ($(KBUILD_CHECKSRC),2) | |
95 | quiet_cmd_force_checksrc = CHECK $< | |
96 | cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; | |
97 | else | |
98 | quiet_cmd_checksrc = CHECK $< | |
99 | cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; | |
100 | endif | |
101 | endif | |
102 | ||
3a025e1d MW |
103 | ifneq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),) |
104 | cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $< ; | |
105 | endif | |
106 | ||
91341d4b SR |
107 | # Do section mismatch analysis for each module/built-in.o |
108 | ifdef CONFIG_DEBUG_SECTION_MISMATCH | |
109 | cmd_secanalysis = ; scripts/mod/modpost $@ | |
110 | endif | |
1da177e4 LT |
111 | |
112 | # Compile C sources (.c) | |
113 | # --------------------------------------------------------------------------- | |
114 | ||
115 | # Default is built-in, unless we know otherwise | |
6588169d SR |
116 | modkern_cflags = \ |
117 | $(if $(part-of-module), \ | |
118 | $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \ | |
80c00ba9 | 119 | $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL)) |
1da177e4 LT |
120 | quiet_modtag := $(empty) $(empty) |
121 | ||
18c167fd SL |
122 | $(real-objs-m) : part-of-module := y |
123 | $(real-objs-m:.o=.i) : part-of-module := y | |
124 | $(real-objs-m:.o=.s) : part-of-module := y | |
125 | $(real-objs-m:.o=.lst): part-of-module := y | |
1da177e4 LT |
126 | |
127 | $(real-objs-m) : quiet_modtag := [M] | |
128 | $(real-objs-m:.o=.i) : quiet_modtag := [M] | |
129 | $(real-objs-m:.o=.s) : quiet_modtag := [M] | |
130 | $(real-objs-m:.o=.lst): quiet_modtag := [M] | |
131 | ||
132 | $(obj-m) : quiet_modtag := [M] | |
133 | ||
134 | # Default for not multi-part modules | |
5e8d780d | 135 | modname = $(basetarget) |
1da177e4 LT |
136 | |
137 | $(multi-objs-m) : modname = $(modname-multi) | |
138 | $(multi-objs-m:.o=.i) : modname = $(modname-multi) | |
139 | $(multi-objs-m:.o=.s) : modname = $(modname-multi) | |
140 | $(multi-objs-m:.o=.lst) : modname = $(modname-multi) | |
141 | $(multi-objs-y) : modname = $(modname-multi) | |
142 | $(multi-objs-y:.o=.i) : modname = $(modname-multi) | |
143 | $(multi-objs-y:.o=.s) : modname = $(modname-multi) | |
144 | $(multi-objs-y:.o=.lst) : modname = $(modname-multi) | |
145 | ||
146 | quiet_cmd_cc_s_c = CC $(quiet_modtag) $@ | |
1e64ff42 | 147 | cmd_cc_s_c = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $< |
1da177e4 | 148 | |
767e581d | 149 | $(obj)/%.s: $(src)/%.c FORCE |
1da177e4 LT |
150 | $(call if_changed_dep,cc_s_c) |
151 | ||
23d43848 MY |
152 | quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@ |
153 | cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $< | |
1da177e4 | 154 | |
767e581d | 155 | $(obj)/%.i: $(src)/%.c FORCE |
23d43848 | 156 | $(call if_changed_dep,cpp_i_c) |
1da177e4 | 157 | |
4efca4ed NP |
158 | # These mirror gensymtypes_S and co below, keep them in synch. |
159 | cmd_gensymtypes_c = \ | |
37a8d9f6 | 160 | $(CPP) -D__GENKSYMS__ $(c_flags) $< | \ |
d70f82ac JH |
161 | $(GENKSYMS) $(if $(1), -T $(2)) \ |
162 | $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \ | |
56067812 | 163 | $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \ |
37a8d9f6 | 164 | $(if $(KBUILD_PRESERVE),-p) \ |
e26d6b83 | 165 | -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null)) |
37a8d9f6 | 166 | |
15fde675 | 167 | quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@ |
37a8d9f6 SR |
168 | cmd_cc_symtypes_c = \ |
169 | set -e; \ | |
4efca4ed | 170 | $(call cmd_gensymtypes_c,true,$@) >/dev/null; \ |
37a8d9f6 | 171 | test -s $@ || rm -f $@ |
15fde675 | 172 | |
767e581d | 173 | $(obj)/%.symtypes : $(src)/%.c FORCE |
64e6c1e1 | 174 | $(call cmd,cc_symtypes_c) |
15fde675 | 175 | |
433db3e2 VT |
176 | # LLVM assembly |
177 | # Generate .ll files from .c | |
178 | quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@ | |
179 | cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $< | |
180 | ||
181 | $(obj)/%.ll: $(src)/%.c FORCE | |
182 | $(call if_changed_dep,cc_ll_c) | |
183 | ||
1da177e4 LT |
184 | # C (.c) files |
185 | # The C file is compiled and updated dependency information is generated. | |
186 | # (See cmd_cc_o_c + relevant part of rule_cc_o_c) | |
187 | ||
188 | quiet_cmd_cc_o_c = CC $(quiet_modtag) $@ | |
189 | ||
190 | ifndef CONFIG_MODVERSIONS | |
191 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< | |
192 | ||
193 | else | |
194 | # When module versioning is enabled the following steps are executed: | |
2ea03891 SR |
195 | # o compile a .tmp_<file>.o from <file>.c |
196 | # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does | |
197 | # not export symbols, we just rename .tmp_<file>.o to <file>.o and | |
1da177e4 LT |
198 | # are done. |
199 | # o otherwise, we calculate symbol versions using the good old | |
200 | # genksyms on the preprocessed source and postprocess them in a way | |
2ea03891 SR |
201 | # that they are usable as a linker script |
202 | # o generate <file>.o from .tmp_<file>.o using the linker to | |
203 | # replace the unresolved symbols __crc_exported_symbol with | |
204 | # the actual value of the checksum generated by genksyms | |
1da177e4 | 205 | |
2ea03891 | 206 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $< |
4efca4ed NP |
207 | |
208 | cmd_modversions_c = \ | |
e26d6b83 | 209 | if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \ |
4efca4ed | 210 | $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ |
e26d6b83 DZ |
211 | > $(@D)/.tmp_$(@F:.o=.ver); \ |
212 | \ | |
213 | $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \ | |
214 | -T $(@D)/.tmp_$(@F:.o=.ver); \ | |
215 | rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \ | |
216 | else \ | |
217 | mv -f $(@D)/.tmp_$(@F) $@; \ | |
1da177e4 LT |
218 | fi; |
219 | endif | |
220 | ||
8da3821b | 221 | ifdef CONFIG_FTRACE_MCOUNT_RECORD |
72441cb1 | 222 | ifdef BUILD_C_RECORDMCOUNT |
85356f80 SR |
223 | ifeq ("$(origin RECORDMCOUNT_WARN)", "command line") |
224 | RECORDMCOUNT_FLAGS = -w | |
225 | endif | |
d7b4d6de SR |
226 | # Due to recursion, we must skip empty.o. |
227 | # The empty.o file is created in the make process in order to determine | |
312a3d09 C |
228 | # the target endianness and word size. It is made before all other C |
229 | # files, including recordmcount. | |
45677454 WZ |
230 | sub_cmd_record_mcount = \ |
231 | if [ $(@) != "scripts/mod/empty.o" ]; then \ | |
85356f80 | 232 | $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \ |
45677454 | 233 | fi; |
d6971822 MM |
234 | recordmcount_source := $(srctree)/scripts/recordmcount.c \ |
235 | $(srctree)/scripts/recordmcount.h | |
72441cb1 | 236 | else |
45677454 | 237 | sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \ |
e6299d26 | 238 | "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \ |
b3acf29a | 239 | "$(if $(CONFIG_64BIT),64,32)" \ |
f9810a82 RV |
240 | "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \ |
241 | "$(LD)" "$(NM)" "$(RM)" "$(MV)" \ | |
18c167fd | 242 | "$(if $(part-of-module),1,0)" "$(@)"; |
d6971822 | 243 | recordmcount_source := $(srctree)/scripts/recordmcount.pl |
312a3d09 | 244 | endif # BUILD_C_RECORDMCOUNT |
c0a80c0c HC |
245 | cmd_record_mcount = \ |
246 | if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" = \ | |
247 | "$(CC_FLAGS_FTRACE)" ]; then \ | |
45677454 WZ |
248 | $(sub_cmd_record_mcount) \ |
249 | fi; | |
312a3d09 | 250 | endif # CONFIG_FTRACE_MCOUNT_RECORD |
8da3821b | 251 | |
b9ab5ebb | 252 | ifdef CONFIG_STACK_VALIDATION |
3b27a0c8 | 253 | ifneq ($(SKIP_STACK_VALIDATION),1) |
b9ab5ebb JP |
254 | |
255 | __objtool_obj := $(objtree)/tools/objtool/objtool | |
256 | ||
11af8474 | 257 | objtool_args = $(if $(CONFIG_UNWINDER_ORC),orc generate,check) |
ee9f8fce | 258 | |
1826c640 PZ |
259 | objtool_args += $(if $(part-of-module), --module,) |
260 | ||
b9ab5ebb JP |
261 | ifndef CONFIG_FRAME_POINTER |
262 | objtool_args += --no-fp | |
263 | endif | |
867ac9d7 JP |
264 | ifdef CONFIG_GCOV_KERNEL |
265 | objtool_args += --no-unreachable | |
da541b20 JP |
266 | else |
267 | objtool_args += $(call cc-ifversion, -lt, 0405, --no-unreachable) | |
867ac9d7 | 268 | endif |
cb83ad28 PZ |
269 | ifdef CONFIG_RETPOLINE |
270 | objtool_args += --retpoline | |
271 | endif | |
272 | ||
b9ab5ebb | 273 | |
2a0098d7 JP |
274 | ifdef CONFIG_MODVERSIONS |
275 | objtool_o = $(@D)/.tmp_$(@F) | |
276 | else | |
277 | objtool_o = $(@) | |
278 | endif | |
279 | ||
b9ab5ebb JP |
280 | # 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory |
281 | # 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file | |
282 | # 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file | |
283 | cmd_objtool = $(if $(patsubst y%,, \ | |
284 | $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \ | |
2a0098d7 | 285 | $(__objtool_obj) $(objtool_args) "$(objtool_o)";) |
b9ab5ebb JP |
286 | objtool_obj = $(if $(patsubst y%,, \ |
287 | $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \ | |
288 | $(__objtool_obj)) | |
289 | ||
3b27a0c8 | 290 | endif # SKIP_STACK_VALIDATION |
b9ab5ebb JP |
291 | endif # CONFIG_STACK_VALIDATION |
292 | ||
ee9f8fce JP |
293 | # Rebuild all objects when objtool changes, or is enabled/disabled. |
294 | objtool_dep = $(objtool_obj) \ | |
295 | $(wildcard include/config/orc/unwinder.h \ | |
296 | include/config/stack/validation.h) | |
297 | ||
1e390209 | 298 | ifdef CONFIG_RETPOLINE |
527d1e11 | 299 | cmd_ubuntu_retpoline = $(CONFIG_SHELL) $(srctree)/scripts/ubuntu-retpoline-extract-one $(@) $(<) "$(filter -m16 %code16gcc.h,$(a_flags))"; |
1e390209 AW |
300 | else |
301 | cmd_ubuntu_retpoline = | |
302 | endif | |
303 | ||
1da177e4 | 304 | define rule_cc_o_c |
6176aa9a | 305 | $(call echo-cmd,checksrc) $(cmd_checksrc) \ |
e4aca459 | 306 | $(call cmd_and_fixdep,cc_o_c) \ |
3a025e1d | 307 | $(cmd_checkdoc) \ |
e8a3118e | 308 | $(call echo-cmd,objtool) $(cmd_objtool) \ |
2a0098d7 | 309 | $(cmd_modversions_c) \ |
1e390209 | 310 | $(call echo-cmd,ubuntu-retpoline) $(cmd_ubuntu_retpoline) \ |
e4aca459 | 311 | $(call echo-cmd,record_mcount) $(cmd_record_mcount) |
1da177e4 LT |
312 | endef |
313 | ||
b9ab5ebb | 314 | define rule_as_o_S |
e4aca459 | 315 | $(call cmd_and_fixdep,as_o_S) \ |
2a0098d7 | 316 | $(call echo-cmd,objtool) $(cmd_objtool) \ |
1e390209 AW |
317 | $(cmd_modversions_S) \ |
318 | $(call echo-cmd,ubuntu-retpoline) $(cmd_ubuntu_retpoline) | |
b9ab5ebb JP |
319 | endef |
320 | ||
9895c03d NP |
321 | # List module undefined symbols (or empty line if not enabled) |
322 | ifdef CONFIG_TRIM_UNUSED_KSYMS | |
323 | cmd_undef_syms = $(NM) $@ | sed -n 's/^ \+U //p' | xargs echo | |
324 | else | |
325 | cmd_undef_syms = echo | |
326 | endif | |
327 | ||
1da177e4 | 328 | # Built-in and composite module parts |
ee9f8fce | 329 | $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE |
1da177e4 | 330 | $(call cmd,force_checksrc) |
c7664ddc | 331 | $(call cmd,force_check_kmsg) |
1da177e4 LT |
332 | $(call if_changed_rule,cc_o_c) |
333 | ||
334 | # Single-part modules are special since we need to mark them in $(MODVERDIR) | |
335 | ||
ee9f8fce | 336 | $(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE |
1da177e4 | 337 | $(call cmd,force_checksrc) |
c7664ddc | 338 | $(call cmd,force_check_kmsg) |
1da177e4 | 339 | $(call if_changed_rule,cc_o_c) |
9895c03d NP |
340 | @{ echo $(@:.o=.ko); echo $@; \ |
341 | $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod) | |
1da177e4 LT |
342 | |
343 | quiet_cmd_cc_lst_c = MKLST $@ | |
344 | cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \ | |
345 | $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \ | |
346 | System.map $(OBJDUMP) > $@ | |
347 | ||
767e581d | 348 | $(obj)/%.lst: $(src)/%.c FORCE |
1da177e4 LT |
349 | $(call if_changed_dep,cc_lst_c) |
350 | ||
351 | # Compile assembler sources (.S) | |
352 | # --------------------------------------------------------------------------- | |
353 | ||
80c00ba9 | 354 | modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL) |
1da177e4 | 355 | |
6588169d SR |
356 | $(real-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE) |
357 | $(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE) | |
1da177e4 | 358 | |
4efca4ed NP |
359 | # .S file exports must have their C prototypes defined in asm/asm-prototypes.h |
360 | # or a file that it includes, in order to get versioned symbols. We build a | |
361 | # dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from | |
362 | # the .S file (with trailing ';'), and run genksyms on that, to extract vers. | |
363 | # | |
364 | # This is convoluted. The .S file must first be preprocessed to run guards and | |
365 | # expand names, then the resulting exports must be constructed into plain | |
366 | # EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed | |
367 | # to make the genksyms input. | |
368 | # | |
369 | # These mirror gensymtypes_c and co above, keep them in synch. | |
370 | cmd_gensymtypes_S = \ | |
371 | (echo "\#include <linux/kernel.h>" ; \ | |
372 | echo "\#include <asm/asm-prototypes.h>" ; \ | |
373 | $(CPP) $(a_flags) $< | \ | |
cc6acc11 NP |
374 | grep "\<___EXPORT_SYMBOL\>" | \ |
375 | sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ) | \ | |
4efca4ed NP |
376 | $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | \ |
377 | $(GENKSYMS) $(if $(1), -T $(2)) \ | |
378 | $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \ | |
56067812 | 379 | $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \ |
4efca4ed NP |
380 | $(if $(KBUILD_PRESERVE),-p) \ |
381 | -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null)) | |
382 | ||
383 | quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@ | |
384 | cmd_cc_symtypes_S = \ | |
385 | set -e; \ | |
386 | $(call cmd_gensymtypes_S,true,$@) >/dev/null; \ | |
387 | test -s $@ || rm -f $@ | |
388 | ||
389 | $(obj)/%.symtypes : $(src)/%.S FORCE | |
390 | $(call cmd,cc_symtypes_S) | |
391 | ||
392 | ||
e0f41e52 MY |
393 | quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@ |
394 | cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $< | |
1da177e4 | 395 | |
767e581d | 396 | $(obj)/%.s: $(src)/%.S FORCE |
e0f41e52 | 397 | $(call if_changed_dep,cpp_s_S) |
1da177e4 LT |
398 | |
399 | quiet_cmd_as_o_S = AS $(quiet_modtag) $@ | |
4efca4ed NP |
400 | |
401 | ifndef CONFIG_MODVERSIONS | |
402 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< | |
403 | ||
404 | else | |
405 | ||
406 | ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h) | |
407 | ||
408 | ifeq ($(ASM_PROTOTYPES),) | |
409 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< | |
410 | ||
411 | else | |
412 | ||
413 | # versioning matches the C process described above, with difference that | |
414 | # we parse asm-prototypes.h C header to get function definitions. | |
415 | ||
416 | cmd_as_o_S = $(CC) $(a_flags) -c -o $(@D)/.tmp_$(@F) $< | |
417 | ||
418 | cmd_modversions_S = \ | |
419 | if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \ | |
420 | $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ | |
421 | > $(@D)/.tmp_$(@F:.o=.ver); \ | |
422 | \ | |
423 | $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \ | |
424 | -T $(@D)/.tmp_$(@F:.o=.ver); \ | |
425 | rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \ | |
426 | else \ | |
427 | mv -f $(@D)/.tmp_$(@F) $@; \ | |
428 | fi; | |
429 | endif | |
430 | endif | |
1da177e4 | 431 | |
ee9f8fce | 432 | $(obj)/%.o: $(src)/%.S $(objtool_dep) FORCE |
b9ab5ebb | 433 | $(call if_changed_rule,as_o_S) |
1da177e4 LT |
434 | |
435 | targets += $(real-objs-y) $(real-objs-m) $(lib-y) | |
436 | targets += $(extra-y) $(MAKECMDGOALS) $(always) | |
437 | ||
438 | # Linker scripts preprocessor (.lds.S -> .lds) | |
439 | # --------------------------------------------------------------------------- | |
440 | quiet_cmd_cpp_lds_S = LDS $@ | |
5cb0512c | 441 | cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \ |
42f29a25 | 442 | -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $< |
1da177e4 | 443 | |
767e581d | 444 | $(obj)/%.lds: $(src)/%.lds.S FORCE |
1da177e4 LT |
445 | $(call if_changed_dep,cpp_lds_S) |
446 | ||
4520c6a4 DH |
447 | # ASN.1 grammar |
448 | # --------------------------------------------------------------------------- | |
449 | quiet_cmd_asn1_compiler = ASN.1 $@ | |
450 | cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \ | |
451 | $(subst .h,.c,$@) $(subst .c,.h,$@) | |
452 | ||
453 | .PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h | |
454 | ||
455 | $(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler | |
456 | $(call cmd,asn1_compiler) | |
457 | ||
1da177e4 LT |
458 | # Build the compiled-in targets |
459 | # --------------------------------------------------------------------------- | |
460 | ||
461 | # To build objects in subdirs, we need to descend into the directories | |
462 | $(sort $(subdir-obj-y)): $(subdir-ym) ; | |
463 | ||
464 | # | |
465 | # Rule to compile a set of .o files into one .o file | |
466 | # | |
467 | ifdef builtin-target | |
a5967db9 SR |
468 | |
469 | ifdef CONFIG_THIN_ARCHIVES | |
9a6cfca4 NP |
470 | cmd_make_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) |
471 | cmd_make_empty_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) | |
a5967db9 SR |
472 | quiet_cmd_link_o_target = AR $@ |
473 | else | |
474 | cmd_make_builtin = $(LD) $(ld_flags) -r -o | |
475 | cmd_make_empty_builtin = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) | |
476 | quiet_cmd_link_o_target = LD $@ | |
477 | endif | |
478 | ||
1da177e4 LT |
479 | # If the list of objects to link is empty, just create an empty built-in.o |
480 | cmd_link_o_target = $(if $(strip $(obj-y)),\ | |
a5967db9 | 481 | $(cmd_make_builtin) $@ $(filter $(obj-y), $^) \ |
91341d4b | 482 | $(cmd_secanalysis),\ |
a5967db9 | 483 | $(cmd_make_empty_builtin) $@) |
1da177e4 LT |
484 | |
485 | $(builtin-target): $(obj-y) FORCE | |
486 | $(call if_changed,link_o_target) | |
487 | ||
488 | targets += $(builtin-target) | |
489 | endif # builtin-target | |
490 | ||
551559e1 TH |
491 | # |
492 | # Rule to create modules.order file | |
493 | # | |
494 | # Create commands to either record .ko file or cat modules.order from | |
495 | # a subdirectory | |
496 | modorder-cmds = \ | |
497 | $(foreach m, $(modorder), \ | |
498 | $(if $(filter %/modules.order, $m), \ | |
499 | cat $m;, echo kernel/$m;)) | |
500 | ||
501 | $(modorder-target): $(subdir-ym) FORCE | |
502 | $(Q)(cat /dev/null; $(modorder-cmds)) > $@ | |
503 | ||
1da177e4 LT |
504 | # |
505 | # Rule to compile a set of .o files into one .a file | |
506 | # | |
507 | ifdef lib-target | |
508 | quiet_cmd_link_l_target = AR $@ | |
a5967db9 SR |
509 | |
510 | ifdef CONFIG_THIN_ARCHIVES | |
9a6cfca4 | 511 | cmd_link_l_target = rm -f $@; $(AR) rcsTP$(KBUILD_ARFLAGS) $@ $(lib-y) |
a5967db9 SR |
512 | else |
513 | cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y) | |
514 | endif | |
1da177e4 LT |
515 | |
516 | $(lib-target): $(lib-y) FORCE | |
517 | $(call if_changed,link_l_target) | |
518 | ||
519 | targets += $(lib-target) | |
7f2084fa AV |
520 | |
521 | dummy-object = $(obj)/.lib_exports.o | |
522 | ksyms-lds = $(dot-target).lds | |
523 | ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX | |
524 | ref_prefix = EXTERN(_ | |
525 | else | |
526 | ref_prefix = EXTERN( | |
527 | endif | |
528 | ||
529 | quiet_cmd_export_list = EXPORTS $@ | |
530 | cmd_export_list = $(OBJDUMP) -h $< | \ | |
76bee234 | 531 | sed -ne '/___ksymtab/s/.*+\([^ ]*\).*/$(ref_prefix)\1)/p' >$(ksyms-lds);\ |
7f2084fa | 532 | rm -f $(dummy-object);\ |
9da2f584 | 533 | echo | $(CC) $(a_flags) -c -o $(dummy-object) -x assembler -;\ |
7f2084fa AV |
534 | $(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\ |
535 | rm $(dummy-object) $(ksyms-lds) | |
536 | ||
537 | $(obj)/lib-ksyms.o: $(lib-target) FORCE | |
538 | $(call if_changed,export_list) | |
989cea5c NP |
539 | |
540 | targets += $(obj)/lib-ksyms.o | |
541 | ||
1da177e4 LT |
542 | endif |
543 | ||
544 | # | |
545 | # Rule to link composite objects | |
546 | # | |
547 | # Composite objects are specified in kbuild makefile as follows: | |
548 | # <composite-object>-objs := <list of .o files> | |
549 | # or | |
550 | # <composite-object>-y := <list of .o files> | |
cf4f2193 MM |
551 | # or |
552 | # <composite-object>-m := <list of .o files> | |
553 | # The -m syntax only works if <composite object> is a module | |
1da177e4 LT |
554 | link_multi_deps = \ |
555 | $(filter $(addprefix $(obj)/, \ | |
556 | $($(subst $(obj)/,,$(@:.o=-objs))) \ | |
cf4f2193 MM |
557 | $($(subst $(obj)/,,$(@:.o=-y))) \ |
558 | $($(subst $(obj)/,,$(@:.o=-m)))), $^) | |
38385f8f | 559 | |
fe026a85 NP |
560 | cmd_link_multi-link = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis) |
561 | ||
562 | ifdef CONFIG_THIN_ARCHIVES | |
563 | quiet_cmd_link_multi-y = AR $@ | |
9a6cfca4 | 564 | cmd_link_multi-y = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) $@ $(link_multi_deps) |
fe026a85 NP |
565 | else |
566 | quiet_cmd_link_multi-y = LD $@ | |
567 | cmd_link_multi-y = $(cmd_link_multi-link) | |
568 | endif | |
1da177e4 LT |
569 | |
570 | quiet_cmd_link_multi-m = LD [M] $@ | |
fe026a85 | 571 | cmd_link_multi-m = $(cmd_link_multi-link) |
1da177e4 | 572 | |
c8589d1e | 573 | $(multi-used-y): FORCE |
1da177e4 | 574 | $(call if_changed,link_multi-y) |
c8589d1e | 575 | $(call multi_depend, $(multi-used-y), .o, -objs -y) |
1da177e4 | 576 | |
c8589d1e | 577 | $(multi-used-m): FORCE |
1da177e4 | 578 | $(call if_changed,link_multi-m) |
9895c03d NP |
579 | @{ echo $(@:.o=.ko); echo $(link_multi_deps); \ |
580 | $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod) | |
cf4f2193 | 581 | $(call multi_depend, $(multi-used-m), .o, -objs -y -m) |
1da177e4 LT |
582 | |
583 | targets += $(multi-used-y) $(multi-used-m) | |
591f6689 | 584 | targets := $(filter-out $(PHONY), $(targets)) |
1da177e4 | 585 | |
c7664ddc MS |
586 | # kmsg check tool |
587 | ifneq ($(KBUILD_KMSG_CHECK),0) | |
588 | ifeq ($(KBUILD_KMSG_CHECK),2) | |
589 | kmsg_cmd := print | |
590 | quiet_cmd_force_check_kmsg = KMSG_PRINT $< | |
591 | $(shell [ -d $(objtree)/man ] || mkdir -p $(objtree)/man) | |
592 | else | |
593 | kmsg_cmd := check | |
594 | quiet_cmd_force_check_kmsg = KMSG_CHECK $< | |
595 | endif | |
596 | cmd_force_check_kmsg = $(KMSG_CHECK) $(kmsg_cmd) $(CC) $(c_flags) $< ; | |
597 | endif | |
598 | ||
1da177e4 LT |
599 | # Descending |
600 | # --------------------------------------------------------------------------- | |
601 | ||
4f193362 | 602 | PHONY += $(subdir-ym) |
1da177e4 | 603 | $(subdir-ym): |
f7adc312 | 604 | $(Q)$(MAKE) $(build)=$@ need-builtin=$(if $(findstring $@,$(subdir-obj-y)),1) |
1da177e4 LT |
605 | |
606 | # Add FORCE to the prequisites of a target to force it to be always rebuilt. | |
607 | # --------------------------------------------------------------------------- | |
608 | ||
4f193362 | 609 | PHONY += FORCE |
1da177e4 LT |
610 | |
611 | FORCE: | |
612 | ||
613 | # Read all saved command lines and dependencies for the $(targets) we | |
614 | # may be building above, using $(if_changed{,_dep}). As an | |
615 | # optimization, we don't need to read them if the target does not | |
616 | # exist, we will rebuild anyway in that case. | |
617 | ||
2982c953 | 618 | cmd_files := $(wildcard $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd)) |
1da177e4 LT |
619 | |
620 | ifneq ($(cmd_files),) | |
621 | include $(cmd_files) | |
622 | endif | |
4f193362 | 623 | |
8a78756e MY |
624 | ifneq ($(KBUILD_SRC),) |
625 | # Create directories for object files if they do not exist | |
626 | obj-dirs := $(sort $(obj) $(patsubst %/,%, $(dir $(targets)))) | |
c4da7ed0 MY |
627 | # If cmd_files exist, their directories apparently exist. Skip mkdir. |
628 | exist-dirs := $(sort $(patsubst %/,%, $(dir $(cmd_files)))) | |
629 | obj-dirs := $(strip $(filter-out $(exist-dirs), $(obj-dirs))) | |
630 | ifneq ($(obj-dirs),) | |
8a78756e MY |
631 | $(shell mkdir -p $(obj-dirs)) |
632 | endif | |
c4da7ed0 | 633 | endif |
8a78756e | 634 | |
4f193362 PS |
635 | # Declare the contents of the .PHONY variable as phony. We keep that |
636 | # information in a variable se we can use it in if_changed and friends. | |
637 | ||
638 | .PHONY: $(PHONY) |