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 $(CFLAGS_GCOV)) 120endif 121 122ifdef CONFIG_SYMBOL_PREFIX 123_sym_flags = -DSYMBOL_PREFIX=$(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 163ifdef REGENERATE_PARSERS 164 165# GPERF 166# --------------------------------------------------------------------------- 167quiet_cmd_gperf = GPERF $@ 168 cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $< 169 170.PRECIOUS: $(src)/%.hash.c_shipped 171$(src)/%.hash.c_shipped: $(src)/%.gperf 172 $(call cmd,gperf) 173 174# LEX 175# --------------------------------------------------------------------------- 176LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy) 177 178quiet_cmd_flex = LEX $@ 179 cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $< 180 181.PRECIOUS: $(src)/%.lex.c_shipped 182$(src)/%.lex.c_shipped: $(src)/%.l 183 $(call cmd,flex) 184 185# YACC 186# --------------------------------------------------------------------------- 187YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy) 188 189quiet_cmd_bison = YACC $@ 190 cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $< 191 192.PRECIOUS: $(src)/%.tab.c_shipped 193$(src)/%.tab.c_shipped: $(src)/%.y 194 $(call cmd,bison) 195 196quiet_cmd_bison_h = YACC $@ 197 cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $< 198 199.PRECIOUS: $(src)/%.tab.h_shipped 200$(src)/%.tab.h_shipped: $(src)/%.y 201 $(call cmd,bison_h) 202 203endif 204 205# Shipped files 206# =========================================================================== 207 208quiet_cmd_shipped = SHIPPED $@ 209cmd_shipped = cat $< > $@ 210 211$(obj)/%: $(src)/%_shipped 212 $(call cmd,shipped) 213 214# Commands useful for building a boot image 215# =========================================================================== 216# 217# Use as following: 218# 219# target: source(s) FORCE 220# $(if_changed,ld/objcopy/gzip) 221# 222# and add target to extra-y so that we know we have to 223# read in the saved command line 224 225# Linking 226# --------------------------------------------------------------------------- 227 228quiet_cmd_ld = LD $@ 229cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \ 230 $(filter-out FORCE,$^) -o $@ 231 232# Objcopy 233# --------------------------------------------------------------------------- 234 235quiet_cmd_objcopy = OBJCOPY $@ 236cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@ 237 238# Gzip 239# --------------------------------------------------------------------------- 240 241quiet_cmd_gzip = GZIP $@ 242cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \ 243 (rm -f $@ ; false) 244 245# DTC 246# --------------------------------------------------------------------------- 247 248# Generate an assembly file to wrap the output of the device tree compiler 249quiet_cmd_dt_S_dtb= DTB $@ 250cmd_dt_S_dtb= \ 251( \ 252 echo '\#include <asm-generic/vmlinux.lds.h>'; \ 253 echo '.section .dtb.init.rodata,"a"'; \ 254 echo '.balign STRUCT_ALIGNMENT'; \ 255 echo '.global __dtb_$(*F)_begin'; \ 256 echo '__dtb_$(*F)_begin:'; \ 257 echo '.incbin "$<" '; \ 258 echo '__dtb_$(*F)_end:'; \ 259 echo '.global __dtb_$(*F)_end'; \ 260 echo '.balign STRUCT_ALIGNMENT'; \ 261) > $@ 262 263$(obj)/%.dtb.S: $(obj)/%.dtb 264 $(call cmd,dt_S_dtb) 265 266quiet_cmd_dtc = DTC $@ 267cmd_dtc = $(objtree)/scripts/dtc/dtc -O dtb -o $@ -b 0 $(DTC_FLAGS) -d $(depfile) $< 268 269# Bzip2 270# --------------------------------------------------------------------------- 271 272# Bzip2 and LZMA do not include size in file... so we have to fake that; 273# append the size as a 32-bit littleendian number as gzip does. 274size_append = printf $(shell \ 275dec_size=0; \ 276for F in $1; do \ 277 fsize=$$(stat -c "%s" $$F); \ 278 dec_size=$$(expr $$dec_size + $$fsize); \ 279done; \ 280printf "%08x\n" $$dec_size | \ 281 sed 's/\(..\)/\1 /g' | { \ 282 read ch0 ch1 ch2 ch3; \ 283 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \ 284 printf '%s%03o' '\\' $$((0x$$ch)); \ 285 done; \ 286 } \ 287) 288 289quiet_cmd_bzip2 = BZIP2 $@ 290cmd_bzip2 = (cat $(filter-out FORCE,$^) | \ 291 bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 292 (rm -f $@ ; false) 293 294# Lzma 295# --------------------------------------------------------------------------- 296 297quiet_cmd_lzma = LZMA $@ 298cmd_lzma = (cat $(filter-out FORCE,$^) | \ 299 lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 300 (rm -f $@ ; false) 301 302quiet_cmd_lzo = LZO $@ 303cmd_lzo = (cat $(filter-out FORCE,$^) | \ 304 lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 305 (rm -f $@ ; false) 306 307# XZ 308# --------------------------------------------------------------------------- 309# Use xzkern to compress the kernel image and xzmisc to compress other things. 310# 311# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage 312# of the kernel decompressor. A BCJ filter is used if it is available for 313# the target architecture. xzkern also appends uncompressed size of the data 314# using size_append. The .xz format has the size information available at 315# the end of the file too, but it's in more complex format and it's good to 316# avoid changing the part of the boot code that reads the uncompressed size. 317# Note that the bytes added by size_append will make the xz tool think that 318# the file is corrupt. This is expected. 319# 320# xzmisc doesn't use size_append, so it can be used to create normal .xz 321# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very 322# big dictionary would increase the memory usage too much in the multi-call 323# decompression mode. A BCJ filter isn't used either. 324quiet_cmd_xzkern = XZKERN $@ 325cmd_xzkern = (cat $(filter-out FORCE,$^) | \ 326 sh $(srctree)/scripts/xz_wrap.sh && \ 327 $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 328 (rm -f $@ ; false) 329 330quiet_cmd_xzmisc = XZMISC $@ 331cmd_xzmisc = (cat $(filter-out FORCE,$^) | \ 332 xz --check=crc32 --lzma2=dict=1MiB) > $@ || \ 333 (rm -f $@ ; false) 334 335# misc stuff 336# --------------------------------------------------------------------------- 337quote:=" 338