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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))))
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: 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))
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		$(CFLAGS_GCOV))
120endif
121
122# If building the kernel in a separate objtree expand all occurrences
123# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
124
125ifeq ($(KBUILD_SRC),)
126__c_flags	= $(_c_flags)
127__a_flags	= $(_a_flags)
128__cpp_flags     = $(_cpp_flags)
129else
130
131# -I$(obj) locates generated .h files
132# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
133#   and locates generated .h files
134# FIXME: Replace both with specific CFLAGS* statements in the makefiles
135__c_flags	= $(call addtree,-I$(obj)) $(call flags,_c_flags)
136__a_flags	=                          $(call flags,_a_flags)
137__cpp_flags     =                          $(call flags,_cpp_flags)
138endif
139
140c_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
141		 $(__c_flags) $(modkern_cflags)                           \
142		 -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags)
143
144a_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
145		 $(__a_flags) $(modkern_aflags)
146
147cpp_flags      = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
148		 $(__cpp_flags)
149
150ld_flags       = $(LDFLAGS) $(ldflags-y)
151
152dtc_cpp_flags  = -Wp,-MD,$(depfile).pre.tmp -nostdinc                    \
153		 -I$(srctree)/arch/$(SRCARCH)/boot/dts                   \
154		 -I$(srctree)/arch/$(SRCARCH)/boot/dts/include           \
155		 -undef -D__DTS__
156
157# Finds the multi-part object the current object will be linked into
158modname-multi = $(sort $(foreach m,$(multi-used),\
159		$(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
160
161ifdef REGENERATE_PARSERS
162
163# GPERF
164# ---------------------------------------------------------------------------
165quiet_cmd_gperf = GPERF $@
166      cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $<
167
168.PRECIOUS: $(src)/%.hash.c_shipped
169$(src)/%.hash.c_shipped: $(src)/%.gperf
170	$(call cmd,gperf)
171
172# LEX
173# ---------------------------------------------------------------------------
174LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)
175
176quiet_cmd_flex = LEX     $@
177      cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $<
178
179.PRECIOUS: $(src)/%.lex.c_shipped
180$(src)/%.lex.c_shipped: $(src)/%.l
181	$(call cmd,flex)
182
183# YACC
184# ---------------------------------------------------------------------------
185YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy)
186
187quiet_cmd_bison = YACC    $@
188      cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $<
189
190.PRECIOUS: $(src)/%.tab.c_shipped
191$(src)/%.tab.c_shipped: $(src)/%.y
192	$(call cmd,bison)
193
194quiet_cmd_bison_h = YACC    $@
195      cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $<
196
197.PRECIOUS: $(src)/%.tab.h_shipped
198$(src)/%.tab.h_shipped: $(src)/%.y
199	$(call cmd,bison_h)
200
201endif
202
203# Shipped files
204# ===========================================================================
205
206quiet_cmd_shipped = SHIPPED $@
207cmd_shipped = cat $< > $@
208
209$(obj)/%: $(src)/%_shipped
210	$(call cmd,shipped)
211
212# Commands useful for building a boot image
213# ===========================================================================
214#
215#	Use as following:
216#
217#	target: source(s) FORCE
218#		$(if_changed,ld/objcopy/gzip)
219#
220#	and add target to extra-y so that we know we have to
221#	read in the saved command line
222
223# Linking
224# ---------------------------------------------------------------------------
225
226quiet_cmd_ld = LD      $@
227cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
228	       $(filter-out FORCE,$^) -o $@
229
230# Objcopy
231# ---------------------------------------------------------------------------
232
233quiet_cmd_objcopy = OBJCOPY $@
234cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
235
236# Gzip
237# ---------------------------------------------------------------------------
238
239quiet_cmd_gzip = GZIP    $@
240cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \
241	(rm -f $@ ; false)
242
243# DTC
244# ---------------------------------------------------------------------------
245
246# Generate an assembly file to wrap the output of the device tree compiler
247quiet_cmd_dt_S_dtb= DTB    $@
248cmd_dt_S_dtb=						\
249(							\
250	echo '\#include <asm-generic/vmlinux.lds.h>'; 	\
251	echo '.section .dtb.init.rodata,"a"';		\
252	echo '.balign STRUCT_ALIGNMENT';		\
253	echo '.global __dtb_$(*F)_begin';		\
254	echo '__dtb_$(*F)_begin:';			\
255	echo '.incbin "$<" ';				\
256	echo '__dtb_$(*F)_end:';			\
257	echo '.global __dtb_$(*F)_end';			\
258	echo '.balign STRUCT_ALIGNMENT'; 		\
259) > $@
260
261$(obj)/%.dtb.S: $(obj)/%.dtb
262	$(call cmd,dt_S_dtb)
263
264quiet_cmd_dtc = DTC     $@
265cmd_dtc = $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
266	$(objtree)/scripts/dtc/dtc -O dtb -o $@ -b 0 \
267		-i $(dir $<) $(DTC_FLAGS) \
268		-d $(depfile).dtc.tmp $(dtc-tmp) ; \
269	cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
270
271$(obj)/%.dtb: $(src)/%.dts FORCE
272	$(call if_changed_dep,dtc)
273
274dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
275
276# cat
277# ---------------------------------------------------------------------------
278# Concatentate multiple files together
279quiet_cmd_cat = CAT     $@
280cmd_cat = (cat $(filter-out FORCE,$^) > $@) || (rm -f $@; false)
281
282# Bzip2
283# ---------------------------------------------------------------------------
284
285# Bzip2 and LZMA do not include size in file... so we have to fake that;
286# append the size as a 32-bit littleendian number as gzip does.
287size_append = printf $(shell						\
288dec_size=0;								\
289for F in $1; do								\
290	fsize=$$(stat -c "%s" $$F);					\
291	dec_size=$$(expr $$dec_size + $$fsize);				\
292done;									\
293printf "%08x\n" $$dec_size |						\
294	sed 's/\(..\)/\1 /g' | {					\
295		read ch0 ch1 ch2 ch3;					\
296		for ch in $$ch3 $$ch2 $$ch1 $$ch0; do			\
297			printf '%s%03o' '\\' $$((0x$$ch)); 		\
298		done;							\
299	}								\
300)
301
302quiet_cmd_bzip2 = BZIP2   $@
303cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
304	bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
305	(rm -f $@ ; false)
306
307# Lzma
308# ---------------------------------------------------------------------------
309
310quiet_cmd_lzma = LZMA    $@
311cmd_lzma = (cat $(filter-out FORCE,$^) | \
312	lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
313	(rm -f $@ ; false)
314
315quiet_cmd_lzo = LZO     $@
316cmd_lzo = (cat $(filter-out FORCE,$^) | \
317	lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
318	(rm -f $@ ; false)
319
320# U-Boot mkimage
321# ---------------------------------------------------------------------------
322
323MKIMAGE := $(srctree)/scripts/mkuboot.sh
324
325# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
326# the number of overrides in arch makefiles
327UIMAGE_ARCH ?= $(SRCARCH)
328UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
329UIMAGE_OPTS-y ?=
330UIMAGE_TYPE ?= kernel
331UIMAGE_LOADADDR ?= arch_must_set_this
332UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
333UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
334UIMAGE_IN ?= $<
335UIMAGE_OUT ?= $@
336
337quiet_cmd_uimage = UIMAGE  $(UIMAGE_OUT)
338      cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
339			-C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
340			-T $(UIMAGE_TYPE) \
341			-a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
342			-n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT)
343
344# XZ
345# ---------------------------------------------------------------------------
346# Use xzkern to compress the kernel image and xzmisc to compress other things.
347#
348# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
349# of the kernel decompressor. A BCJ filter is used if it is available for
350# the target architecture. xzkern also appends uncompressed size of the data
351# using size_append. The .xz format has the size information available at
352# the end of the file too, but it's in more complex format and it's good to
353# avoid changing the part of the boot code that reads the uncompressed size.
354# Note that the bytes added by size_append will make the xz tool think that
355# the file is corrupt. This is expected.
356#
357# xzmisc doesn't use size_append, so it can be used to create normal .xz
358# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
359# big dictionary would increase the memory usage too much in the multi-call
360# decompression mode. A BCJ filter isn't used either.
361quiet_cmd_xzkern = XZKERN  $@
362cmd_xzkern = (cat $(filter-out FORCE,$^) | \
363	sh $(srctree)/scripts/xz_wrap.sh && \
364	$(call size_append, $(filter-out FORCE,$^))) > $@ || \
365	(rm -f $@ ; false)
366
367quiet_cmd_xzmisc = XZMISC  $@
368cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
369	xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
370	(rm -f $@ ; false)
371
372# misc stuff
373# ---------------------------------------------------------------------------
374quote:="
375