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