kernel/common.git - Unnamed repository; edit this file 'description' to name the repository.

1 # Backward compatibility
2 asflags-y  += $(EXTRA_AFLAGS)
3 ccflags-y  += $(EXTRA_CFLAGS)
4 cppflags-y += $(EXTRA_CPPFLAGS)
5 ldflags-y  += $(EXTRA_LDFLAGS)
6
7 #
8 # flags that take effect in sub directories
9 export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y)
10 export KBUILD_SUBDIR_CCFLAGS := $(KBUILD_SUBDIR_CCFLAGS) $(subdir-ccflags-y)
11
12 # Figure out what we need to build from the various variables
13 # ===========================================================================
14
15 # When an object is listed to be built compiled-in and modular,
16 # only build the compiled-in version
17
18 obj-m := $(filter-out $(obj-y),$(obj-m))
19
20 # Libraries are always collected in one lib file.
21 # Filter out objects already built-in
22
23 lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
24
25
26 # Handle objects in subdirs
27 # ---------------------------------------------------------------------------
28 # o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o
29 #   and add the directory to the list of dirs to descend into: $(subdir-y)
30 # o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
31 #   and add the directory to the list of dirs to descend into: $(subdir-m)
32
33 # Determine modorder.
34 # Unfortunately, we don't have information about ordering between -y
35 # and -m subdirs.  Just put -y's first.
36 modorder	:= $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
37
38 __subdir-y	:= $(patsubst %/,%,$(filter %/, $(obj-y)))
39 subdir-y	+= $(__subdir-y)
40 __subdir-m	:= $(patsubst %/,%,$(filter %/, $(obj-m)))
41 subdir-m	+= $(__subdir-m)
42 obj-y		:= $(patsubst %/, %/built-in.o, $(obj-y))
43 obj-m		:= $(filter-out %/, $(obj-m))
44
45 # Subdirectories we need to descend into
46
47 subdir-ym	:= $(sort $(subdir-y) $(subdir-m))
48
49 # if $(foo-objs) exists, foo.o is a composite object
50 multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
51 multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))), $(m))))
52 multi-used   := $(multi-used-y) $(multi-used-m)
53 single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
54
55 # Build list of the parts of our composite objects, our composite
56 # objects depend on those (obviously)
57 multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
58 multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
59 multi-objs   := $(multi-objs-y) $(multi-objs-m)
60
61 # $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
62 # tell kbuild to descend
63 subdir-obj-y := $(filter %/built-in.o, $(obj-y))
64
65 # $(obj-dirs) is a list of directories that contain object files
66 obj-dirs := $(dir $(multi-objs) $(obj-y))
67
68 # Replace multi-part objects by their individual parts, look at local dir only
69 real-objs-y := $(foreach m, $(filter-out $(subdir-obj-y), $(obj-y)), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) $(extra-y)
70 real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)),$(m)))
71
72 # Add subdir path
73
74 extra-y		:= $(addprefix $(obj)/,$(extra-y))
75 always		:= $(addprefix $(obj)/,$(always))
76 targets		:= $(addprefix $(obj)/,$(targets))
77 modorder	:= $(addprefix $(obj)/,$(modorder))
78 obj-y		:= $(addprefix $(obj)/,$(obj-y))
79 obj-m		:= $(addprefix $(obj)/,$(obj-m))
80 lib-y		:= $(addprefix $(obj)/,$(lib-y))
81 subdir-obj-y	:= $(addprefix $(obj)/,$(subdir-obj-y))
82 real-objs-y	:= $(addprefix $(obj)/,$(real-objs-y))
83 real-objs-m	:= $(addprefix $(obj)/,$(real-objs-m))
84 single-used-m	:= $(addprefix $(obj)/,$(single-used-m))
85 multi-used-y	:= $(addprefix $(obj)/,$(multi-used-y))
86 multi-used-m	:= $(addprefix $(obj)/,$(multi-used-m))
87 multi-objs-y	:= $(addprefix $(obj)/,$(multi-objs-y))
88 multi-objs-m	:= $(addprefix $(obj)/,$(multi-objs-m))
89 subdir-ym	:= $(addprefix $(obj)/,$(subdir-ym))
90 obj-dirs	:= $(addprefix $(obj)/,$(obj-dirs))
91
92 # These flags are needed for modversions and compiling, so we define them here
93 # already
94 # $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will
95 # end up in (or would, if it gets compiled in)
96 # Note: Files that end up in two or more modules are compiled without the
97 #       KBUILD_MODNAME definition. The reason is that any made-up name would
98 #       differ in different configs.
99 name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote)
100 basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
101 modname_flags  = $(if $(filter 1,$(words $(modname))),\
102                  -DKBUILD_MODNAME=$(call name-fix,$(modname)))
103
104 orig_c_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \
105                  $(ccflags-y) $(CFLAGS_$(basetarget).o)
106 _c_flags       = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
107 orig_a_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \
108                  $(asflags-y) $(AFLAGS_$(basetarget).o)
109 _a_flags       = $(filter-out $(AFLAGS_REMOVE_$(basetarget).o), $(orig_a_flags))
110 _cpp_flags     = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
111
112 #
113 # Enable gcov profiling flags for a file, directory or for all files depending
114 # on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
115 # (in this order)
116 #
117 ifeq ($(CONFIG_GCOV_KERNEL),y)
118 _c_flags += $(if $(patsubst n%,, \
119 		$(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
120 		$(CFLAGS_GCOV))
121 endif
122
123 #
124 # Enable address sanitizer flags for kernel except some files or directories
125 # we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
126 #
127 ifeq ($(CONFIG_KASAN),y)
128 _c_flags += $(if $(patsubst n%,, \
129 		$(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
130 		$(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
131 endif
132
133 ifeq ($(CONFIG_UBSAN),y)
134 _c_flags += $(if $(patsubst n%,, \
135 		$(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
136 		$(CFLAGS_UBSAN))
137 endif
138
139 ifeq ($(CONFIG_KCOV),y)
140 _c_flags += $(if $(patsubst n%,, \
141 	$(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
142 	$(CFLAGS_KCOV))
143 endif
144
145 # If building the kernel in a separate objtree expand all occurrences
146 # of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
147
148 ifeq ($(KBUILD_SRC),)
149 __c_flags	= $(_c_flags)
150 __a_flags	= $(_a_flags)
151 __cpp_flags     = $(_cpp_flags)
152 else
153
154 # -I$(obj) locates generated .h files
155 # $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
156 #   and locates generated .h files
157 # FIXME: Replace both with specific CFLAGS* statements in the makefiles
158 __c_flags	= $(if $(obj),-I$(srctree)/$(src) -I$(obj)) \
159 		  $(call flags,_c_flags)
160 __a_flags	= $(call flags,_a_flags)
161 __cpp_flags     = $(call flags,_cpp_flags)
162 endif
163
164 c_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
165 		 $(__c_flags) $(modkern_cflags)                           \
166 		 $(basename_flags) $(modname_flags)
167
168 a_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
169 		 $(__a_flags) $(modkern_aflags)
170
171 cpp_flags      = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
172 		 $(__cpp_flags)
173
174 ld_flags       = $(LDFLAGS) $(ldflags-y)
175
176 dtc_cpp_flags  = -Wp,-MD,$(depfile).pre.tmp -nostdinc                    \
177 		 -I$(srctree)/arch/$(SRCARCH)/boot/dts                   \
178 		 -I$(srctree)/arch/$(SRCARCH)/boot/dts/include           \
179 		 -I$(srctree)/drivers/of/testcase-data                   \
180 		 -undef -D__DTS__
181
182 # Finds the multi-part object the current object will be linked into
183 modname-multi = $(sort $(foreach m,$(multi-used),\
184 		$(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
185
186 # Useful for describing the dependency of composite objects
187 # Usage:
188 #   $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
189 define multi_depend
190 $(foreach m, $(notdir $1), \
191 	$(eval $(obj)/$m: \
192 	$(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
193 endef
194
195 ifdef REGENERATE_PARSERS
196
197 # GPERF
198 # ---------------------------------------------------------------------------
199 quiet_cmd_gperf = GPERF $@
200       cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $<
201
202 .PRECIOUS: $(src)/%.hash.c_shipped
203 $(src)/%.hash.c_shipped: $(src)/%.gperf
204 	$(call cmd,gperf)
205
206 # LEX
207 # ---------------------------------------------------------------------------
208 LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)
209
210 quiet_cmd_flex = LEX     $@
211       cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $<
212
213 .PRECIOUS: $(src)/%.lex.c_shipped
214 $(src)/%.lex.c_shipped: $(src)/%.l
215 	$(call cmd,flex)
216
217 # YACC
218 # ---------------------------------------------------------------------------
219 YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy)
220
221 quiet_cmd_bison = YACC    $@
222       cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $<
223
224 .PRECIOUS: $(src)/%.tab.c_shipped
225 $(src)/%.tab.c_shipped: $(src)/%.y
226 	$(call cmd,bison)
227
228 quiet_cmd_bison_h = YACC    $@
229       cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $<
230
231 .PRECIOUS: $(src)/%.tab.h_shipped
232 $(src)/%.tab.h_shipped: $(src)/%.y
233 	$(call cmd,bison_h)
234
235 endif
236
237 # Shipped files
238 # ===========================================================================
239
240 quiet_cmd_shipped = SHIPPED $@
241 cmd_shipped = cat $< > $@
242
243 $(obj)/%: $(src)/%_shipped
244 	$(call cmd,shipped)
245
246 # Commands useful for building a boot image
247 # ===========================================================================
248 #
249 #	Use as following:
250 #
251 #	target: source(s) FORCE
252 #		$(if_changed,ld/objcopy/gzip)
253 #
254 #	and add target to extra-y so that we know we have to
255 #	read in the saved command line
256
257 # Linking
258 # ---------------------------------------------------------------------------
259
260 quiet_cmd_ld = LD      $@
261 cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
262 	       $(filter-out FORCE,$^) -o $@
263
264 # Objcopy
265 # ---------------------------------------------------------------------------
266
267 quiet_cmd_objcopy = OBJCOPY $@
268 cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
269
270 # Gzip
271 # ---------------------------------------------------------------------------
272
273 quiet_cmd_gzip = GZIP    $@
274 cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \
275 	(rm -f $@ ; false)
276
277 # DTC
278 # ---------------------------------------------------------------------------
279 DTC ?= $(objtree)/scripts/dtc/dtc
280
281 # Disable noisy checks by default
282 ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),)
283 DTC_FLAGS += -Wno-unit_address_vs_reg \
284 	-Wno-simple_bus_reg \
285 	-Wno-unit_address_format \
286 	-Wno-pci_bridge \
287 	-Wno-pci_device_bus_num \
288 	-Wno-pci_device_reg
289 endif
290
291 ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),2)
292 DTC_FLAGS += -Wnode_name_chars_strict \
293 	-Wproperty_name_chars_strict
294 endif
295
296 # Generate an assembly file to wrap the output of the device tree compiler
297 quiet_cmd_dt_S_dtb= DTB     $@
298 cmd_dt_S_dtb=						\
299 (							\
300 	echo '\#include <asm-generic/vmlinux.lds.h>'; 	\
301 	echo '.section .dtb.init.rodata,"a"';		\
302 	echo '.balign STRUCT_ALIGNMENT';		\
303 	echo '.global __dtb_$(subst -,_,$(*F))_begin';	\
304 	echo '__dtb_$(subst -,_,$(*F))_begin:';		\
305 	echo '.incbin "$<" ';				\
306 	echo '__dtb_$(subst -,_,$(*F))_end:';		\
307 	echo '.global __dtb_$(subst -,_,$(*F))_end';	\
308 	echo '.balign STRUCT_ALIGNMENT'; 		\
309 ) > $@
310
311 $(obj)/%.dtb.S: $(obj)/%.dtb
312 	$(call cmd,dt_S_dtb)
313
314 quiet_cmd_dtc = DTC     $@
315 cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
316 	$(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
317 	$(DTC) -@ -O dtb -o $@ -b 0 \
318 		-i $(dir $<) $(DTC_FLAGS) \
319 		-d $(depfile).dtc.tmp $(dtc-tmp) ; \
320 	cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
321
322 $(obj)/%.dtb: $(src)/%.dts FORCE
323 	$(call if_changed_dep,dtc)
324
325 ifeq ($(CONFIG_AMLOGIC_MODIFY),y)
326 $(obj)/%.dtbo: $(src)/%.dts FORCE
327 	$(call if_changed_dep,dtc)
328 endif
329
330 dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
331
332 # cat
333 # ---------------------------------------------------------------------------
334 # Concatentate multiple files together
335 quiet_cmd_cat = CAT     $@
336 cmd_cat = (cat $(filter-out FORCE,$^) > $@) || (rm -f $@; false)
337
338 # Bzip2
339 # ---------------------------------------------------------------------------
340
341 # Bzip2 and LZMA do not include size in file... so we have to fake that;
342 # append the size as a 32-bit littleendian number as gzip does.
343 size_append = printf $(shell						\
344 dec_size=0;								\
345 for F in $1; do								\
346 	fsize=$$(stat -c "%s" $$F);					\
347 	dec_size=$$(expr $$dec_size + $$fsize);				\
348 done;									\
349 printf "%08x\n" $$dec_size |						\
350 	sed 's/\(..\)/\1 /g' | {					\
351 		read ch0 ch1 ch2 ch3;					\
352 		for ch in $$ch3 $$ch2 $$ch1 $$ch0; do			\
353 			printf '%s%03o' '\\' $$((0x$$ch)); 		\
354 		done;							\
355 	}								\
356 )
357
358 quiet_cmd_bzip2 = BZIP2   $@
359 cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
360 	bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
361 	(rm -f $@ ; false)
362
363 # Lzma
364 # ---------------------------------------------------------------------------
365
366 quiet_cmd_lzma = LZMA    $@
367 cmd_lzma = (cat $(filter-out FORCE,$^) | \
368 	lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
369 	(rm -f $@ ; false)
370
371 quiet_cmd_lzo = LZO     $@
372 cmd_lzo = (cat $(filter-out FORCE,$^) | \
373 	lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
374 	(rm -f $@ ; false)
375
376 quiet_cmd_lz4 = LZ4     $@
377 cmd_lz4 = (cat $(filter-out FORCE,$^) | \
378 	lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
379 	(rm -f $@ ; false)
380
381 # U-Boot mkimage
382 # ---------------------------------------------------------------------------
383
384 MKIMAGE := $(srctree)/scripts/mkuboot.sh
385
386 # SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
387 # the number of overrides in arch makefiles
388 UIMAGE_ARCH ?= $(SRCARCH)
389 UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
390 UIMAGE_OPTS-y ?=
391 UIMAGE_TYPE ?= kernel
392 UIMAGE_LOADADDR ?= arch_must_set_this
393 UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
394 UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
395 UIMAGE_IN ?= $<
396 UIMAGE_OUT ?= $@
397
398 quiet_cmd_uimage = UIMAGE  $(UIMAGE_OUT)
399       cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
400 			-C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
401 			-T $(UIMAGE_TYPE) \
402 			-a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
403 			-n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT)
404
405 # XZ
406 # ---------------------------------------------------------------------------
407 # Use xzkern to compress the kernel image and xzmisc to compress other things.
408 #
409 # xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
410 # of the kernel decompressor. A BCJ filter is used if it is available for
411 # the target architecture. xzkern also appends uncompressed size of the data
412 # using size_append. The .xz format has the size information available at
413 # the end of the file too, but it's in more complex format and it's good to
414 # avoid changing the part of the boot code that reads the uncompressed size.
415 # Note that the bytes added by size_append will make the xz tool think that
416 # the file is corrupt. This is expected.
417 #
418 # xzmisc doesn't use size_append, so it can be used to create normal .xz
419 # files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
420 # big dictionary would increase the memory usage too much in the multi-call
421 # decompression mode. A BCJ filter isn't used either.
422 quiet_cmd_xzkern = XZKERN  $@
423 cmd_xzkern = (cat $(filter-out FORCE,$^) | \
424 	sh $(srctree)/scripts/xz_wrap.sh && \
425 	$(call size_append, $(filter-out FORCE,$^))) > $@ || \
426 	(rm -f $@ ; false)
427
428 quiet_cmd_xzmisc = XZMISC  $@
429 cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
430 	xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
431 	(rm -f $@ ; false)
432
433 # ASM offsets
434 # ---------------------------------------------------------------------------
435
436 # Default sed regexp - multiline due to syntax constraints
437 #
438 # Use [:space:] because LLVM's integrated assembler inserts <tab> around
439 # the .ascii directive whereas GCC keeps the <space> as-is.
440 define sed-offsets
441 	's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \
442 	/^->/{s:->#\(.*\):/* \1 */:; \
443 	s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
444 	s:->::; p;}'
445 endef
446
447 # Use filechk to avoid rebuilds when a header changes, but the resulting file
448 # does not
449 define filechk_offsets
450 	(set -e; \
451 	 echo "#ifndef $2"; \
452 	 echo "#define $2"; \
453 	 echo "/*"; \
454 	 echo " * DO NOT MODIFY."; \
455 	 echo " *"; \
456 	 echo " * This file was generated by Kbuild"; \
457 	 echo " */"; \
458 	 echo ""; \
459 	 sed -ne $(sed-offsets); \
460 	 echo ""; \
461 	 echo "#endif" )
462 endef
463
1	# Backward compatibility
2	asflags-y += $(EXTRA_AFLAGS)
3	ccflags-y += $(EXTRA_CFLAGS)
4	cppflags-y += $(EXTRA_CPPFLAGS)
5	ldflags-y += $(EXTRA_LDFLAGS)
6
7	#
8	# flags that take effect in sub directories
9	export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y)
10	export KBUILD_SUBDIR_CCFLAGS := $(KBUILD_SUBDIR_CCFLAGS) $(subdir-ccflags-y)
11
12	# Figure out what we need to build from the various variables
13	# ===========================================================================
14
15	# When an object is listed to be built compiled-in and modular,
16	# only build the compiled-in version
17
18	obj-m := $(filter-out $(obj-y),$(obj-m))
19
20	# Libraries are always collected in one lib file.
21	# Filter out objects already built-in
22
23	lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
24
25
26	# Handle objects in subdirs
27	# ---------------------------------------------------------------------------
28	# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o
29	# and add the directory to the list of dirs to descend into: $(subdir-y)
30	# o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
31	# and add the directory to the list of dirs to descend into: $(subdir-m)
32
33	# Determine modorder.
34	# Unfortunately, we don't have information about ordering between -y
35	# and -m subdirs. Just put -y's first.
36	modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
37
38	__subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
39	subdir-y += $(__subdir-y)
40	__subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
41	subdir-m += $(__subdir-m)
42	obj-y := $(patsubst %/, %/built-in.o, $(obj-y))
43	obj-m := $(filter-out %/, $(obj-m))
44
45	# Subdirectories we need to descend into
46
47	subdir-ym := $(sort $(subdir-y) $(subdir-m))
48
49	# if $(foo-objs) exists, foo.o is a composite object
50	multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
51	multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))), $(m))))
52	multi-used := $(multi-used-y) $(multi-used-m)
53	single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
54
55	# Build list of the parts of our composite objects, our composite
56	# objects depend on those (obviously)
57	multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
58	multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
59	multi-objs := $(multi-objs-y) $(multi-objs-m)
60
61	# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
62	# tell kbuild to descend
63	subdir-obj-y := $(filter %/built-in.o, $(obj-y))
64
65	# $(obj-dirs) is a list of directories that contain object files
66	obj-dirs := $(dir $(multi-objs) $(obj-y))
67
68	# Replace multi-part objects by their individual parts, look at local dir only
69	real-objs-y := $(foreach m, $(filter-out $(subdir-obj-y), $(obj-y)), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) $(extra-y)
70	real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)),$(m)))
71
72	# Add subdir path
73
74	extra-y := $(addprefix $(obj)/,$(extra-y))
75	always := $(addprefix $(obj)/,$(always))
76	targets := $(addprefix $(obj)/,$(targets))
77	modorder := $(addprefix $(obj)/,$(modorder))
78	obj-y := $(addprefix $(obj)/,$(obj-y))
79	obj-m := $(addprefix $(obj)/,$(obj-m))
80	lib-y := $(addprefix $(obj)/,$(lib-y))
81	subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
82	real-objs-y := $(addprefix $(obj)/,$(real-objs-y))
83	real-objs-m := $(addprefix $(obj)/,$(real-objs-m))
84	single-used-m := $(addprefix $(obj)/,$(single-used-m))
85	multi-used-y := $(addprefix $(obj)/,$(multi-used-y))
86	multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
87	multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y))
88	multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m))
89	subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
90	obj-dirs := $(addprefix $(obj)/,$(obj-dirs))
91
92	# These flags are needed for modversions and compiling, so we define them here
93	# already
94	# $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will
95	# end up in (or would, if it gets compiled in)
96	# Note: Files that end up in two or more modules are compiled without the
97	# KBUILD_MODNAME definition. The reason is that any made-up name would
98	# differ in different configs.
99	name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote)
100	basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
101	modname_flags = $(if $(filter 1,$(words $(modname))),\
102	-DKBUILD_MODNAME=$(call name-fix,$(modname)))
103
104	orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \
105	$(ccflags-y) $(CFLAGS_$(basetarget).o)
106	_c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
107	orig_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \
108	$(asflags-y) $(AFLAGS_$(basetarget).o)
109	_a_flags = $(filter-out $(AFLAGS_REMOVE_$(basetarget).o), $(orig_a_flags))
110	_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
111
112	#
113	# Enable gcov profiling flags for a file, directory or for all files depending
114	# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
115	# (in this order)
116	#
117	ifeq ($(CONFIG_GCOV_KERNEL),y)
118	_c_flags += $(if $(patsubst n%,, \
119	$(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
120	$(CFLAGS_GCOV))
121	endif
122
123	#
124	# Enable address sanitizer flags for kernel except some files or directories
125	# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
126	#
127	ifeq ($(CONFIG_KASAN),y)
128	_c_flags += $(if $(patsubst n%,, \
129	$(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
130	$(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
131	endif
132
133	ifeq ($(CONFIG_UBSAN),y)
134	_c_flags += $(if $(patsubst n%,, \
135	$(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
136	$(CFLAGS_UBSAN))
137	endif
138
139	ifeq ($(CONFIG_KCOV),y)
140	_c_flags += $(if $(patsubst n%,, \
141	$(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
142	$(CFLAGS_KCOV))
143	endif
144
145	# If building the kernel in a separate objtree expand all occurrences
146	# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
147
148	ifeq ($(KBUILD_SRC),)
149	__c_flags = $(_c_flags)
150	__a_flags = $(_a_flags)
151	__cpp_flags = $(_cpp_flags)
152	else
153
154	# -I$(obj) locates generated .h files
155	# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
156	# and locates generated .h files
157	# FIXME: Replace both with specific CFLAGS* statements in the makefiles
158	__c_flags = $(if $(obj),-I$(srctree)/$(src) -I$(obj)) \
159	$(call flags,_c_flags)
160	__a_flags = $(call flags,_a_flags)
161	__cpp_flags = $(call flags,_cpp_flags)
162	endif
163
164	c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
165	$(__c_flags) $(modkern_cflags) \
166	$(basename_flags) $(modname_flags)
167
168	a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
169	$(__a_flags) $(modkern_aflags)
170
171	cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
172	$(__cpp_flags)
173
174	ld_flags = $(LDFLAGS) $(ldflags-y)
175
176	dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \
177	-I$(srctree)/arch/$(SRCARCH)/boot/dts \
178	-I$(srctree)/arch/$(SRCARCH)/boot/dts/include \
179	-I$(srctree)/drivers/of/testcase-data \
180	-undef -D__DTS__
181
182	# Finds the multi-part object the current object will be linked into
183	modname-multi = $(sort $(foreach m,$(multi-used),\
184	$(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
185
186	# Useful for describing the dependency of composite objects
187	# Usage:
188	# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
189	define multi_depend
190	$(foreach m, $(notdir $1), \
191	$(eval $(obj)/$m: \
192	$(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
193	endef
194
195	ifdef REGENERATE_PARSERS
196
197	# GPERF
198	# ---------------------------------------------------------------------------
199	quiet_cmd_gperf = GPERF $@
200	cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $<
201
202	.PRECIOUS: $(src)/%.hash.c_shipped
203	$(src)/%.hash.c_shipped: $(src)/%.gperf
204	$(call cmd,gperf)
205
206	# LEX
207	# ---------------------------------------------------------------------------
208	LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)
209
210	quiet_cmd_flex = LEX $@
211	cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $<
212
213	.PRECIOUS: $(src)/%.lex.c_shipped
214	$(src)/%.lex.c_shipped: $(src)/%.l
215	$(call cmd,flex)
216
217	# YACC
218	# ---------------------------------------------------------------------------
219	YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy)
220
221	quiet_cmd_bison = YACC $@
222	cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $<
223
224	.PRECIOUS: $(src)/%.tab.c_shipped
225	$(src)/%.tab.c_shipped: $(src)/%.y
226	$(call cmd,bison)
227
228	quiet_cmd_bison_h = YACC $@
229	cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $<
230
231	.PRECIOUS: $(src)/%.tab.h_shipped
232	$(src)/%.tab.h_shipped: $(src)/%.y
233	$(call cmd,bison_h)
234
235	endif
236
237	# Shipped files
238	# ===========================================================================
239
240	quiet_cmd_shipped = SHIPPED $@
241	cmd_shipped = cat $< > $@
242
243	$(obj)/%: $(src)/%_shipped
244	$(call cmd,shipped)
245
246	# Commands useful for building a boot image
247	# ===========================================================================
248	#
249	# Use as following:
250	#
251	# target: source(s) FORCE
252	# $(if_changed,ld/objcopy/gzip)
253	#
254	# and add target to extra-y so that we know we have to
255	# read in the saved command line
256
257	# Linking
258	# ---------------------------------------------------------------------------
259
260	quiet_cmd_ld = LD $@
261	cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
262	$(filter-out FORCE,$^) -o $@
263
264	# Objcopy
265	# ---------------------------------------------------------------------------
266
267	quiet_cmd_objcopy = OBJCOPY $@
268	cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
269
270	# Gzip
271	# ---------------------------------------------------------------------------
272
273	quiet_cmd_gzip = GZIP $@
274	cmd_gzip = (cat $(filter-out FORCE,$^) \| gzip -n -f -9 > $@) \|\| \
275	(rm -f $@ ; false)
276
277	# DTC
278	# ---------------------------------------------------------------------------
279	DTC ?= $(objtree)/scripts/dtc/dtc
280
281	# Disable noisy checks by default
282	ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),)
283	DTC_FLAGS += -Wno-unit_address_vs_reg \
284	-Wno-simple_bus_reg \
285	-Wno-unit_address_format \
286	-Wno-pci_bridge \
287	-Wno-pci_device_bus_num \
288	-Wno-pci_device_reg
289	endif
290
291	ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),2)
292	DTC_FLAGS += -Wnode_name_chars_strict \
293	-Wproperty_name_chars_strict
294	endif
295
296	# Generate an assembly file to wrap the output of the device tree compiler
297	quiet_cmd_dt_S_dtb= DTB $@
298	cmd_dt_S_dtb= \
299	( \
300	echo '\#include <asm-generic/vmlinux.lds.h>'; \
301	echo '.section .dtb.init.rodata,"a"'; \
302	echo '.balign STRUCT_ALIGNMENT'; \
303	echo '.global __dtb_$(subst -,_,$(*F))_begin'; \
304	echo '__dtb_$(subst -,_,$(*F))_begin:'; \
305	echo '.incbin "$<" '; \
306	echo '__dtb_$(subst -,_,$(*F))_end:'; \
307	echo '.global __dtb_$(subst -,_,$(*F))_end'; \
308	echo '.balign STRUCT_ALIGNMENT'; \
309	) > $@
310
311	$(obj)/%.dtb.S: $(obj)/%.dtb
312	$(call cmd,dt_S_dtb)
313
314	quiet_cmd_dtc = DTC $@
315	cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
316	$(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
317	$(DTC) -@ -O dtb -o $@ -b 0 \
318	-i $(dir $<) $(DTC_FLAGS) \
319	-d $(depfile).dtc.tmp $(dtc-tmp) ; \
320	cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
321
322	$(obj)/%.dtb: $(src)/%.dts FORCE
323	$(call if_changed_dep,dtc)
324
325	ifeq ($(CONFIG_AMLOGIC_MODIFY),y)
326	$(obj)/%.dtbo: $(src)/%.dts FORCE
327	$(call if_changed_dep,dtc)
328	endif
329
330	dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
331
332	# cat
333	# ---------------------------------------------------------------------------
334	# Concatentate multiple files together
335	quiet_cmd_cat = CAT $@
336	cmd_cat = (cat $(filter-out FORCE,$^) > $@) \|\| (rm -f $@; false)
337
338	# Bzip2
339	# ---------------------------------------------------------------------------
340
341	# Bzip2 and LZMA do not include size in file... so we have to fake that;
342	# append the size as a 32-bit littleendian number as gzip does.
343	size_append = printf $(shell \
344	dec_size=0; \
345	for F in $1; do \
346	fsize=$$(stat -c "%s" $$F); \
347	dec_size=$$(expr $$dec_size + $$fsize); \
348	done; \
349	printf "%08x\n" $$dec_size \| \
350	sed 's/\(..\)/\1 /g' \| { \
351	read ch0 ch1 ch2 ch3; \
352	for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
353	printf '%s%03o' '\\' $$((0x$$ch)); \
354	done; \
355	} \
356	)
357
358	quiet_cmd_bzip2 = BZIP2 $@
359	cmd_bzip2 = (cat $(filter-out FORCE,$^) \| \
360	bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ \|\| \
361	(rm -f $@ ; false)
362
363	# Lzma
364	# ---------------------------------------------------------------------------
365
366	quiet_cmd_lzma = LZMA $@
367	cmd_lzma = (cat $(filter-out FORCE,$^) \| \
368	lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ \|\| \
369	(rm -f $@ ; false)
370
371	quiet_cmd_lzo = LZO $@
372	cmd_lzo = (cat $(filter-out FORCE,$^) \| \
373	lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ \|\| \
374	(rm -f $@ ; false)
375
376	quiet_cmd_lz4 = LZ4 $@
377	cmd_lz4 = (cat $(filter-out FORCE,$^) \| \
378	lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ \|\| \
379	(rm -f $@ ; false)
380
381	# U-Boot mkimage
382	# ---------------------------------------------------------------------------
383
384	MKIMAGE := $(srctree)/scripts/mkuboot.sh
385
386	# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
387	# the number of overrides in arch makefiles
388	UIMAGE_ARCH ?= $(SRCARCH)
389	UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
390	UIMAGE_OPTS-y ?=
391	UIMAGE_TYPE ?= kernel
392	UIMAGE_LOADADDR ?= arch_must_set_this
393	UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
394	UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
395	UIMAGE_IN ?= $<
396	UIMAGE_OUT ?= $@
397
398	quiet_cmd_uimage = UIMAGE $(UIMAGE_OUT)
399	cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
400	-C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
401	-T $(UIMAGE_TYPE) \
402	-a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
403	-n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT)
404
405	# XZ
406	# ---------------------------------------------------------------------------
407	# Use xzkern to compress the kernel image and xzmisc to compress other things.
408	#
409	# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
410	# of the kernel decompressor. A BCJ filter is used if it is available for
411	# the target architecture. xzkern also appends uncompressed size of the data
412	# using size_append. The .xz format has the size information available at
413	# the end of the file too, but it's in more complex format and it's good to
414	# avoid changing the part of the boot code that reads the uncompressed size.
415	# Note that the bytes added by size_append will make the xz tool think that
416	# the file is corrupt. This is expected.
417	#
418	# xzmisc doesn't use size_append, so it can be used to create normal .xz
419	# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
420	# big dictionary would increase the memory usage too much in the multi-call
421	# decompression mode. A BCJ filter isn't used either.
422	quiet_cmd_xzkern = XZKERN $@
423	cmd_xzkern = (cat $(filter-out FORCE,$^) \| \
424	sh $(srctree)/scripts/xz_wrap.sh && \
425	$(call size_append, $(filter-out FORCE,$^))) > $@ \|\| \
426	(rm -f $@ ; false)
427
428	quiet_cmd_xzmisc = XZMISC $@
429	cmd_xzmisc = (cat $(filter-out FORCE,$^) \| \
430	xz --check=crc32 --lzma2=dict=1MiB) > $@ \|\| \
431	(rm -f $@ ; false)
432
433	# ASM offsets
434	# ---------------------------------------------------------------------------
435
436	# Default sed regexp - multiline due to syntax constraints
437	#
438	# Use [:space:] because LLVM's integrated assembler inserts <tab> around
439	# the .ascii directive whereas GCC keeps the <space> as-is.
440	define sed-offsets
441	's:^[[:space:]]\.ascii[[:space:]]"\(.\)".:\1:; \
442	/^->/{s:->#\(.\):/ \1 */:; \
443	s:^->\([^ ]\) [\$$#]\([^ ]\) \(.\):#define \1 \2 /* \3 */:; \
444	s:->::; p;}'
445	endef
446
447	# Use filechk to avoid rebuilds when a header changes, but the resulting file
448	# does not
449	define filechk_offsets
450	(set -e; \
451	echo "#ifndef $2"; \
452	echo "#define $2"; \
453	echo "/*"; \
454	echo " * DO NOT MODIFY."; \
455	echo " *"; \
456	echo " * This file was generated by Kbuild"; \
457	echo " */"; \
458	echo ""; \
459	sed -ne $(sed-offsets); \
460	echo ""; \
461	echo "#endif" )
462	endef
463