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1# Backward compatibility
2asflags-y += $(EXTRA_AFLAGS)
3ccflags-y += $(EXTRA_CFLAGS)
4cppflags-y += $(EXTRA_CPPFLAGS)
5ldflags-y += $(EXTRA_LDFLAGS)
6
7#
8# flags that take effect in sub directories
9export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y)
10export 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
18obj-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
23lib-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.
36modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
37
38__subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
39subdir-y += $(__subdir-y)
40__subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
41subdir-m += $(__subdir-m)
42obj-y := $(patsubst %/, %/built-in.o, $(obj-y))
43obj-m := $(filter-out %/, $(obj-m))
44
45# Subdirectories we need to descend into
46
47subdir-ym := $(sort $(subdir-y) $(subdir-m))
48
49# if $(foo-objs) exists, foo.o is a composite object
50multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
51multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))), $(m))))
52multi-used := $(multi-used-y) $(multi-used-m)
53single-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)
57multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
58multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
59multi-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
63subdir-obj-y := $(filter %/built-in.o, $(obj-y))
64
65# $(obj-dirs) is a list of directories that contain object files
66obj-dirs := $(dir $(multi-objs) $(obj-y))
67
68# Replace multi-part objects by their individual parts, look at local dir only
69real-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)
70real-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
74extra-y := $(addprefix $(obj)/,$(extra-y))
75always := $(addprefix $(obj)/,$(always))
76targets := $(addprefix $(obj)/,$(targets))
77modorder := $(addprefix $(obj)/,$(modorder))
78obj-y := $(addprefix $(obj)/,$(obj-y))
79obj-m := $(addprefix $(obj)/,$(obj-m))
80lib-y := $(addprefix $(obj)/,$(lib-y))
81subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
82real-objs-y := $(addprefix $(obj)/,$(real-objs-y))
83real-objs-m := $(addprefix $(obj)/,$(real-objs-m))
84single-used-m := $(addprefix $(obj)/,$(single-used-m))
85multi-used-y := $(addprefix $(obj)/,$(multi-used-y))
86multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
87multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y))
88multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m))
89subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
90obj-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.
99name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote)
100basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
101modname_flags = $(if $(filter 1,$(words $(modname))),\
102 -DKBUILD_MODNAME=$(call name-fix,$(modname)))
103
104orig_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))
107orig_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#
117ifeq ($(CONFIG_GCOV_KERNEL),y)
118_c_flags += $(if $(patsubst n%,, \
119 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
120 $(CFLAGS_GCOV))
121endif
122
123#
124# Enable address sanitizer flags for kernel except some files or directories
125# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
126#
127ifeq ($(CONFIG_KASAN),y)
128_c_flags += $(if $(patsubst n%,, \
129 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
130 $(CFLAGS_KASAN))
131endif
132
133ifeq ($(CONFIG_UBSAN),y)
134_c_flags += $(if $(patsubst n%,, \
135 $(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
136 $(CFLAGS_UBSAN))
137endif
138
139ifeq ($(CONFIG_KCOV),y)
140_c_flags += $(if $(patsubst n%,, \
141 $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
142 $(CFLAGS_KCOV))
143endif
144
145# If building the kernel in a separate objtree expand all occurrences
146# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
147
148ifeq ($(KBUILD_SRC),)
149__c_flags = $(_c_flags)
150__a_flags = $(_a_flags)
151__cpp_flags = $(_cpp_flags)
152else
153
154# -I$(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 = $(call flags,_cpp_flags)
162endif
163
164c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
165 $(__c_flags) $(modkern_cflags) \
166 $(basename_flags) $(modname_flags)
167
168a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
169 $(__a_flags) $(modkern_aflags)
170
171cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
172 $(__cpp_flags)
173
174ld_flags = $(LDFLAGS) $(ldflags-y)
175
176dtc_cpp_flags = -Wp,-MD,$(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
183modname-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# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
189define multi_depend
190$(foreach m, $(notdir $1), \
191 $(eval $(obj)/$m: \
192 $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
193endef
194
195ifdef REGENERATE_PARSERS
196
197# GPERF
198# ---------------------------------------------------------------------------
199quiet_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# ---------------------------------------------------------------------------
208LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)
209
210quiet_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# ---------------------------------------------------------------------------
219YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy)
220
221quiet_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
228quiet_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
235endif
236
237# Shipped files
238# ===========================================================================
239
240quiet_cmd_shipped = SHIPPED $@
241cmd_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
260quiet_cmd_ld = LD $@
261cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
262 $(filter-out FORCE,$^) -o $@
263
264# Objcopy
265# ---------------------------------------------------------------------------
266
267quiet_cmd_objcopy = OBJCOPY $@
268cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
269
270# Gzip
271# ---------------------------------------------------------------------------
272
273quiet_cmd_gzip = GZIP $@
274cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \
275 (rm -f $@ ; false)
276
277# DTC
278# ---------------------------------------------------------------------------
279DTC ?= $(objtree)/scripts/dtc/dtc
280
281# Disable noisy checks by default
282ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),)
283DTC_FLAGS += -Wno-unit_address_vs_reg
284endif
285
286# Generate an assembly file to wrap the output of the device tree compiler
287quiet_cmd_dt_S_dtb= DTB $@
288cmd_dt_S_dtb= \
289( \
290 echo '\#include <asm-generic/vmlinux.lds.h>'; \
291 echo '.section .dtb.init.rodata,"a"'; \
292 echo '.balign STRUCT_ALIGNMENT'; \
293 echo '.global __dtb_$(*F)_begin'; \
294 echo '__dtb_$(*F)_begin:'; \
295 echo '.incbin "$<" '; \
296 echo '__dtb_$(*F)_end:'; \
297 echo '.global __dtb_$(*F)_end'; \
298 echo '.balign STRUCT_ALIGNMENT'; \
299) > $@
300
301$(obj)/%.dtb.S: $(obj)/%.dtb
302 $(call cmd,dt_S_dtb)
303
304quiet_cmd_dtc = DTC $@
305cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
306 $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
307 $(DTC) -O dtb -o $@ -b 0 \
308 -i $(dir $<) $(DTC_FLAGS) \
309 -d $(depfile).dtc.tmp $(dtc-tmp) ; \
310 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
311
312$(obj)/%.dtb: $(src)/%.dts FORCE
313 $(call if_changed_dep,dtc)
314
315dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
316
317# Bzip2
318# ---------------------------------------------------------------------------
319
320# Bzip2 and LZMA do not include size in file... so we have to fake that;
321# append the size as a 32-bit littleendian number as gzip does.
322size_append = printf $(shell \
323dec_size=0; \
324for F in $1; do \
325 fsize=$$(stat -c "%s" $$F); \
326 dec_size=$$(expr $$dec_size + $$fsize); \
327done; \
328printf "%08x\n" $$dec_size | \
329 sed 's/\(..\)/\1 /g' | { \
330 read ch0 ch1 ch2 ch3; \
331 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
332 printf '%s%03o' '\\' $$((0x$$ch)); \
333 done; \
334 } \
335)
336
337quiet_cmd_bzip2 = BZIP2 $@
338cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
339 bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
340 (rm -f $@ ; false)
341
342# Lzma
343# ---------------------------------------------------------------------------
344
345quiet_cmd_lzma = LZMA $@
346cmd_lzma = (cat $(filter-out FORCE,$^) | \
347 lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
348 (rm -f $@ ; false)
349
350quiet_cmd_lzo = LZO $@
351cmd_lzo = (cat $(filter-out FORCE,$^) | \
352 lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
353 (rm -f $@ ; false)
354
355quiet_cmd_lz4 = LZ4 $@
356cmd_lz4 = (cat $(filter-out FORCE,$^) | \
357 lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
358 (rm -f $@ ; false)
359
360# U-Boot mkimage
361# ---------------------------------------------------------------------------
362
363MKIMAGE := $(srctree)/scripts/mkuboot.sh
364
365# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
366# the number of overrides in arch makefiles
367UIMAGE_ARCH ?= $(SRCARCH)
368UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
369UIMAGE_OPTS-y ?=
370UIMAGE_TYPE ?= kernel
371UIMAGE_LOADADDR ?= arch_must_set_this
372UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
373UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
374UIMAGE_IN ?= $<
375UIMAGE_OUT ?= $@
376
377quiet_cmd_uimage = UIMAGE $(UIMAGE_OUT)
378 cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
379 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
380 -T $(UIMAGE_TYPE) \
381 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
382 -n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT)
383
384# XZ
385# ---------------------------------------------------------------------------
386# Use xzkern to compress the kernel image and xzmisc to compress other things.
387#
388# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
389# of the kernel decompressor. A BCJ filter is used if it is available for
390# the target architecture. xzkern also appends uncompressed size of the data
391# using size_append. The .xz format has the size information available at
392# the end of the file too, but it's in more complex format and it's good to
393# avoid changing the part of the boot code that reads the uncompressed size.
394# Note that the bytes added by size_append will make the xz tool think that
395# the file is corrupt. This is expected.
396#
397# xzmisc doesn't use size_append, so it can be used to create normal .xz
398# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
399# big dictionary would increase the memory usage too much in the multi-call
400# decompression mode. A BCJ filter isn't used either.
401quiet_cmd_xzkern = XZKERN $@
402cmd_xzkern = (cat $(filter-out FORCE,$^) | \
403 sh $(srctree)/scripts/xz_wrap.sh && \
404 $(call size_append, $(filter-out FORCE,$^))) > $@ || \
405 (rm -f $@ ; false)
406
407quiet_cmd_xzmisc = XZMISC $@
408cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
409 xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
410 (rm -f $@ ; false)
1# Backward compatibility
2asflags-y += $(EXTRA_AFLAGS)
3ccflags-y += $(EXTRA_CFLAGS)
4cppflags-y += $(EXTRA_CPPFLAGS)
5ldflags-y += $(EXTRA_LDFLAGS)
6
7#
8# flags that take effect in sub directories
9export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y)
10export 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
18obj-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
23lib-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.
36modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
37
38__subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
39subdir-y += $(__subdir-y)
40__subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
41subdir-m += $(__subdir-m)
42obj-y := $(patsubst %/, %/built-in.o, $(obj-y))
43obj-m := $(filter-out %/, $(obj-m))
44
45# Subdirectories we need to descend into
46
47subdir-ym := $(sort $(subdir-y) $(subdir-m))
48
49# if $(foo-objs) exists, foo.o is a composite object
50multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
51multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))), $(m))))
52multi-used := $(multi-used-y) $(multi-used-m)
53single-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)
57multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
58multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
59multi-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
63subdir-obj-y := $(filter %/built-in.o, $(obj-y))
64
65# $(obj-dirs) is a list of directories that contain object files
66obj-dirs := $(dir $(multi-objs) $(obj-y))
67
68# Replace multi-part objects by their individual parts, look at local dir only
69real-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)
70real-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
74extra-y := $(addprefix $(obj)/,$(extra-y))
75always := $(addprefix $(obj)/,$(always))
76targets := $(addprefix $(obj)/,$(targets))
77modorder := $(addprefix $(obj)/,$(modorder))
78obj-y := $(addprefix $(obj)/,$(obj-y))
79obj-m := $(addprefix $(obj)/,$(obj-m))
80lib-y := $(addprefix $(obj)/,$(lib-y))
81subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
82real-objs-y := $(addprefix $(obj)/,$(real-objs-y))
83real-objs-m := $(addprefix $(obj)/,$(real-objs-m))
84single-used-m := $(addprefix $(obj)/,$(single-used-m))
85multi-used-y := $(addprefix $(obj)/,$(multi-used-y))
86multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
87multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y))
88multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m))
89subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
90obj-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.
99name-fix = $(subst $(comma),_,$(subst -,_,$1))
100basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(basetarget)))"
101modname_flags = $(if $(filter 1,$(words $(modname))),\
102 -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))")
103
104orig_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))
107orig_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#
117ifeq ($(CONFIG_GCOV_KERNEL),y)
118_c_flags += $(if $(patsubst n%,, \
119 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
120 $(CFLAGS_GCOV))
121endif
122
123#
124# Enable address sanitizer flags for kernel except some files or directories
125# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
126#
127ifeq ($(CONFIG_KASAN),y)
128_c_flags += $(if $(patsubst n%,, \
129 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
130 $(CFLAGS_KASAN))
131endif
132
133ifeq ($(CONFIG_UBSAN),y)
134_c_flags += $(if $(patsubst n%,, \
135 $(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
136 $(CFLAGS_UBSAN))
137endif
138
139ifeq ($(CONFIG_KCOV),y)
140_c_flags += $(if $(patsubst n%,, \
141 $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)y), \
142 $(CFLAGS_KCOV))
143endif
144
145# If building the kernel in a separate objtree expand all occurrences
146# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
147
148ifeq ($(KBUILD_SRC),)
149__c_flags = $(_c_flags)
150__a_flags = $(_a_flags)
151__cpp_flags = $(_cpp_flags)
152else
153
154# -I$(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 = $(call addtree,-I$(obj)) $(call flags,_c_flags)
159__a_flags = $(call flags,_a_flags)
160__cpp_flags = $(call flags,_cpp_flags)
161endif
162
163c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
164 $(__c_flags) $(modkern_cflags) \
165 -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags)
166
167a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
168 $(__a_flags) $(modkern_aflags)
169
170cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
171 $(__cpp_flags)
172
173ld_flags = $(LDFLAGS) $(ldflags-y)
174
175dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \
176 -I$(srctree)/arch/$(SRCARCH)/boot/dts \
177 -I$(srctree)/arch/$(SRCARCH)/boot/dts/include \
178 -I$(srctree)/drivers/of/testcase-data \
179 -undef -D__DTS__
180
181# Finds the multi-part object the current object will be linked into
182modname-multi = $(sort $(foreach m,$(multi-used),\
183 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
184
185# Useful for describing the dependency of composite objects
186# Usage:
187# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
188define multi_depend
189$(foreach m, $(notdir $1), \
190 $(eval $(obj)/$m: \
191 $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
192endef
193
194ifdef REGENERATE_PARSERS
195
196# GPERF
197# ---------------------------------------------------------------------------
198quiet_cmd_gperf = GPERF $@
199 cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $<
200
201.PRECIOUS: $(src)/%.hash.c_shipped
202$(src)/%.hash.c_shipped: $(src)/%.gperf
203 $(call cmd,gperf)
204
205# LEX
206# ---------------------------------------------------------------------------
207LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)
208
209quiet_cmd_flex = LEX $@
210 cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $<
211
212.PRECIOUS: $(src)/%.lex.c_shipped
213$(src)/%.lex.c_shipped: $(src)/%.l
214 $(call cmd,flex)
215
216# YACC
217# ---------------------------------------------------------------------------
218YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy)
219
220quiet_cmd_bison = YACC $@
221 cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $<
222
223.PRECIOUS: $(src)/%.tab.c_shipped
224$(src)/%.tab.c_shipped: $(src)/%.y
225 $(call cmd,bison)
226
227quiet_cmd_bison_h = YACC $@
228 cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $<
229
230.PRECIOUS: $(src)/%.tab.h_shipped
231$(src)/%.tab.h_shipped: $(src)/%.y
232 $(call cmd,bison_h)
233
234endif
235
236# Shipped files
237# ===========================================================================
238
239quiet_cmd_shipped = SHIPPED $@
240cmd_shipped = cat $< > $@
241
242$(obj)/%: $(src)/%_shipped
243 $(call cmd,shipped)
244
245# Commands useful for building a boot image
246# ===========================================================================
247#
248# Use as following:
249#
250# target: source(s) FORCE
251# $(if_changed,ld/objcopy/gzip)
252#
253# and add target to extra-y so that we know we have to
254# read in the saved command line
255
256# Linking
257# ---------------------------------------------------------------------------
258
259quiet_cmd_ld = LD $@
260cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
261 $(filter-out FORCE,$^) -o $@
262
263# Objcopy
264# ---------------------------------------------------------------------------
265
266quiet_cmd_objcopy = OBJCOPY $@
267cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
268
269# Gzip
270# ---------------------------------------------------------------------------
271
272quiet_cmd_gzip = GZIP $@
273cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \
274 (rm -f $@ ; false)
275
276# DTC
277# ---------------------------------------------------------------------------
278DTC ?= $(objtree)/scripts/dtc/dtc
279
280# Generate an assembly file to wrap the output of the device tree compiler
281quiet_cmd_dt_S_dtb= DTB $@
282cmd_dt_S_dtb= \
283( \
284 echo '\#include <asm-generic/vmlinux.lds.h>'; \
285 echo '.section .dtb.init.rodata,"a"'; \
286 echo '.balign STRUCT_ALIGNMENT'; \
287 echo '.global __dtb_$(*F)_begin'; \
288 echo '__dtb_$(*F)_begin:'; \
289 echo '.incbin "$<" '; \
290 echo '__dtb_$(*F)_end:'; \
291 echo '.global __dtb_$(*F)_end'; \
292 echo '.balign STRUCT_ALIGNMENT'; \
293) > $@
294
295$(obj)/%.dtb.S: $(obj)/%.dtb
296 $(call cmd,dt_S_dtb)
297
298quiet_cmd_dtc = DTC $@
299cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
300 $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
301 $(DTC) -O dtb -o $@ -b 0 \
302 -i $(dir $<) $(DTC_FLAGS) \
303 -d $(depfile).dtc.tmp $(dtc-tmp) ; \
304 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
305
306$(obj)/%.dtb: $(src)/%.dts FORCE
307 $(call if_changed_dep,dtc)
308
309dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
310
311# Bzip2
312# ---------------------------------------------------------------------------
313
314# Bzip2 and LZMA do not include size in file... so we have to fake that;
315# append the size as a 32-bit littleendian number as gzip does.
316size_append = printf $(shell \
317dec_size=0; \
318for F in $1; do \
319 fsize=$$(stat -c "%s" $$F); \
320 dec_size=$$(expr $$dec_size + $$fsize); \
321done; \
322printf "%08x\n" $$dec_size | \
323 sed 's/\(..\)/\1 /g' | { \
324 read ch0 ch1 ch2 ch3; \
325 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
326 printf '%s%03o' '\\' $$((0x$$ch)); \
327 done; \
328 } \
329)
330
331quiet_cmd_bzip2 = BZIP2 $@
332cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
333 bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
334 (rm -f $@ ; false)
335
336# Lzma
337# ---------------------------------------------------------------------------
338
339quiet_cmd_lzma = LZMA $@
340cmd_lzma = (cat $(filter-out FORCE,$^) | \
341 lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
342 (rm -f $@ ; false)
343
344quiet_cmd_lzo = LZO $@
345cmd_lzo = (cat $(filter-out FORCE,$^) | \
346 lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
347 (rm -f $@ ; false)
348
349quiet_cmd_lz4 = LZ4 $@
350cmd_lz4 = (cat $(filter-out FORCE,$^) | \
351 lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
352 (rm -f $@ ; false)
353
354# U-Boot mkimage
355# ---------------------------------------------------------------------------
356
357MKIMAGE := $(srctree)/scripts/mkuboot.sh
358
359# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
360# the number of overrides in arch makefiles
361UIMAGE_ARCH ?= $(SRCARCH)
362UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
363UIMAGE_OPTS-y ?=
364UIMAGE_TYPE ?= kernel
365UIMAGE_LOADADDR ?= arch_must_set_this
366UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
367UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
368UIMAGE_IN ?= $<
369UIMAGE_OUT ?= $@
370
371quiet_cmd_uimage = UIMAGE $(UIMAGE_OUT)
372 cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
373 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
374 -T $(UIMAGE_TYPE) \
375 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
376 -n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT)
377
378# XZ
379# ---------------------------------------------------------------------------
380# Use xzkern to compress the kernel image and xzmisc to compress other things.
381#
382# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
383# of the kernel decompressor. A BCJ filter is used if it is available for
384# the target architecture. xzkern also appends uncompressed size of the data
385# using size_append. The .xz format has the size information available at
386# the end of the file too, but it's in more complex format and it's good to
387# avoid changing the part of the boot code that reads the uncompressed size.
388# Note that the bytes added by size_append will make the xz tool think that
389# the file is corrupt. This is expected.
390#
391# xzmisc doesn't use size_append, so it can be used to create normal .xz
392# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
393# big dictionary would increase the memory usage too much in the multi-call
394# decompression mode. A BCJ filter isn't used either.
395quiet_cmd_xzkern = XZKERN $@
396cmd_xzkern = (cat $(filter-out FORCE,$^) | \
397 sh $(srctree)/scripts/xz_wrap.sh && \
398 $(call size_append, $(filter-out FORCE,$^))) > $@ || \
399 (rm -f $@ ; false)
400
401quiet_cmd_xzmisc = XZMISC $@
402cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
403 xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
404 (rm -f $@ ; false)