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))))
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) $(subdir-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=-objs)) $($(m:.o=-y)),$(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: It's possible that one object gets potentially linked into more
97#       than one module. In that case KBUILD_MODNAME will be set to foo_bar,
98#       where foo and bar are the name of the modules.
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))
107_a_flags       = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \
108                 $(asflags-y) $(AFLAGS_$(basetarget).o)
109_cpp_flags     = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
110
111#
112# Enable gcov profiling flags for a file, directory or for all files depending
113# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
114# (in this order)
115#
116ifeq ($(CONFIG_GCOV_KERNEL),y)
117_c_flags += $(if $(patsubst n%,, \
118		$(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
119		$(CFLAGS_GCOV))
120endif
121
122ifdef CONFIG_SYMBOL_PREFIX
123_sym_flags = -DSYMBOL_PREFIX=$(patsubst "%",%,$(CONFIG_SYMBOL_PREFIX))
124_cpp_flags += $(_sym_flags)
125_a_flags += $(_sym_flags)
126endif
127
128
129# If building the kernel in a separate objtree expand all occurrences
130# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
131
132ifeq ($(KBUILD_SRC),)
133__c_flags	= $(_c_flags)
134__a_flags	= $(_a_flags)
135__cpp_flags     = $(_cpp_flags)
136else
137
138# -I$(obj) locates generated .h files
139# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
140#   and locates generated .h files
141# FIXME: Replace both with specific CFLAGS* statements in the makefiles
142__c_flags	= $(call addtree,-I$(obj)) $(call flags,_c_flags)
143__a_flags	=                          $(call flags,_a_flags)
144__cpp_flags     =                          $(call flags,_cpp_flags)
145endif
146
147c_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
148		 $(__c_flags) $(modkern_cflags)                           \
149		 -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags)
150
151a_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
152		 $(__a_flags) $(modkern_aflags)
153
154cpp_flags      = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
155		 $(__cpp_flags)
156
157ld_flags       = $(LDFLAGS) $(ldflags-y)
158
159# Finds the multi-part object the current object will be linked into
160modname-multi = $(sort $(foreach m,$(multi-used),\
161		$(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
162
163# Shipped files
164# ===========================================================================
165
166quiet_cmd_shipped = SHIPPED $@
167cmd_shipped = cat $< > $@
168
169$(obj)/%:: $(src)/%_shipped
170	$(call cmd,shipped)
171
172# Commands useful for building a boot image
173# ===========================================================================
174#
175#	Use as following:
176#
177#	target: source(s) FORCE
178#		$(if_changed,ld/objcopy/gzip)
179#
180#	and add target to extra-y so that we know we have to
181#	read in the saved command line
182
183# Linking
184# ---------------------------------------------------------------------------
185
186quiet_cmd_ld = LD      $@
187cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
188	       $(filter-out FORCE,$^) -o $@
189
190# Objcopy
191# ---------------------------------------------------------------------------
192
193quiet_cmd_objcopy = OBJCOPY $@
194cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
195
196# Gzip
197# ---------------------------------------------------------------------------
198
199quiet_cmd_gzip = GZIP    $@
200cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -f -9 > $@) || \
201	(rm -f $@ ; false)
202
203# DTC
204# ---------------------------------------------------------------------------
205
206# Generate an assembly file to wrap the output of the device tree compiler
207quiet_cmd_dt_S_dtb= DTB    $@
208cmd_dt_S_dtb=						\
209(							\
210	echo '\#include <asm-generic/vmlinux.lds.h>'; 	\
211	echo '.section .dtb.init.rodata,"a"';		\
212	echo '.balign STRUCT_ALIGNMENT';		\
213	echo '.global __dtb_$(*F)_begin';		\
214	echo '__dtb_$(*F)_begin:';			\
215	echo '.incbin "$<" ';				\
216	echo '__dtb_$(*F)_end:';			\
217	echo '.global __dtb_$(*F)_end';			\
218	echo '.balign STRUCT_ALIGNMENT'; 		\
219) > $@
220
221$(obj)/%.dtb.S: $(obj)/%.dtb
222	$(call cmd,dt_S_dtb)
223
224quiet_cmd_dtc = DTC     $@
225cmd_dtc = $(objtree)/scripts/dtc/dtc -O dtb -o $@ -b 0 $(DTC_FLAGS) $<
226
227# Bzip2
228# ---------------------------------------------------------------------------
229
230# Bzip2 and LZMA do not include size in file... so we have to fake that;
231# append the size as a 32-bit littleendian number as gzip does.
232size_append = printf $(shell						\
233dec_size=0;								\
234for F in $1; do								\
235	fsize=$$(stat -c "%s" $$F);					\
236	dec_size=$$(expr $$dec_size + $$fsize);				\
237done;									\
238printf "%08x\n" $$dec_size |						\
239	sed 's/\(..\)/\1 /g' | {					\
240		read ch0 ch1 ch2 ch3;					\
241		for ch in $$ch3 $$ch2 $$ch1 $$ch0; do			\
242			printf '%s%03o' '\\' $$((0x$$ch)); 		\
243		done;							\
244	}								\
245)
246
247quiet_cmd_bzip2 = BZIP2   $@
248cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
249	bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
250	(rm -f $@ ; false)
251
252# Lzma
253# ---------------------------------------------------------------------------
254
255quiet_cmd_lzma = LZMA    $@
256cmd_lzma = (cat $(filter-out FORCE,$^) | \
257	lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
258	(rm -f $@ ; false)
259
260quiet_cmd_lzo = LZO     $@
261cmd_lzo = (cat $(filter-out FORCE,$^) | \
262	lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
263	(rm -f $@ ; false)
264
265# XZ
266# ---------------------------------------------------------------------------
267# Use xzkern to compress the kernel image and xzmisc to compress other things.
268#
269# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
270# of the kernel decompressor. A BCJ filter is used if it is available for
271# the target architecture. xzkern also appends uncompressed size of the data
272# using size_append. The .xz format has the size information available at
273# the end of the file too, but it's in more complex format and it's good to
274# avoid changing the part of the boot code that reads the uncompressed size.
275# Note that the bytes added by size_append will make the xz tool think that
276# the file is corrupt. This is expected.
277#
278# xzmisc doesn't use size_append, so it can be used to create normal .xz
279# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
280# big dictionary would increase the memory usage too much in the multi-call
281# decompression mode. A BCJ filter isn't used either.
282quiet_cmd_xzkern = XZKERN  $@
283cmd_xzkern = (cat $(filter-out FORCE,$^) | \
284	sh $(srctree)/scripts/xz_wrap.sh && \
285	$(call size_append, $(filter-out FORCE,$^))) > $@ || \
286	(rm -f $@ ; false)
287
288quiet_cmd_xzmisc = XZMISC  $@
289cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
290	xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
291	(rm -f $@ ; false)
292
293# misc stuff
294# ---------------------------------------------------------------------------
295quote:="
296