1# 2# SPDX-License-Identifier: GPL-2.0 3# 4# Backward compatibility 5asflags-y += $(EXTRA_AFLAGS) 6ccflags-y += $(EXTRA_CFLAGS) 7cppflags-y += $(EXTRA_CPPFLAGS) 8ldflags-y += $(EXTRA_LDFLAGS) 9 10# 11# flags that take effect in sub directories 12export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y) 13export KBUILD_SUBDIR_CCFLAGS := $(KBUILD_SUBDIR_CCFLAGS) $(subdir-ccflags-y) 14 15# Figure out what we need to build from the various variables 16# =========================================================================== 17 18# When an object is listed to be built compiled-in and modular, 19# only build the compiled-in version 20 21obj-m := $(filter-out $(obj-y),$(obj-m)) 22 23# Libraries are always collected in one lib file. 24# Filter out objects already built-in 25 26lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m))) 27 28 29# Handle objects in subdirs 30# --------------------------------------------------------------------------- 31# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o 32# and add the directory to the list of dirs to descend into: $(subdir-y) 33# o if we encounter foo/ in $(obj-m), remove it from $(obj-m) 34# and add the directory to the list of dirs to descend into: $(subdir-m) 35 36# Determine modorder. 37# Unfortunately, we don't have information about ordering between -y 38# and -m subdirs. Just put -y's first. 39modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko)) 40 41__subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y))) 42subdir-y += $(__subdir-y) 43__subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m))) 44subdir-m += $(__subdir-m) 45obj-y := $(patsubst %/, %/built-in.o, $(obj-y)) 46obj-m := $(filter-out %/, $(obj-m)) 47 48# Subdirectories we need to descend into 49 50subdir-ym := $(sort $(subdir-y) $(subdir-m)) 51 52# if $(foo-objs) exists, foo.o is a composite object 53multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m)))) 54multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m)))) 55multi-used := $(multi-used-y) $(multi-used-m) 56single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m))) 57 58# Build list of the parts of our composite objects, our composite 59# objects depend on those (obviously) 60multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y))) 61multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y))) 62multi-objs := $(multi-objs-y) $(multi-objs-m) 63 64# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to 65# tell kbuild to descend 66subdir-obj-y := $(filter %/built-in.o, $(obj-y)) 67 68# $(obj-dirs) is a list of directories that contain object files 69obj-dirs := $(dir $(multi-objs) $(obj-y)) 70 71# Replace multi-part objects by their individual parts, look at local dir only 72real-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) 73real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) 74 75# Add subdir path 76 77extra-y := $(addprefix $(obj)/,$(extra-y)) 78always := $(addprefix $(obj)/,$(always)) 79targets := $(addprefix $(obj)/,$(targets)) 80modorder := $(addprefix $(obj)/,$(modorder)) 81obj-y := $(addprefix $(obj)/,$(obj-y)) 82obj-m := $(addprefix $(obj)/,$(obj-m)) 83lib-y := $(addprefix $(obj)/,$(lib-y)) 84subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y)) 85real-objs-y := $(addprefix $(obj)/,$(real-objs-y)) 86real-objs-m := $(addprefix $(obj)/,$(real-objs-m)) 87single-used-m := $(addprefix $(obj)/,$(single-used-m)) 88multi-used-y := $(addprefix $(obj)/,$(multi-used-y)) 89multi-used-m := $(addprefix $(obj)/,$(multi-used-m)) 90multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y)) 91multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m)) 92subdir-ym := $(addprefix $(obj)/,$(subdir-ym)) 93obj-dirs := $(addprefix $(obj)/,$(obj-dirs)) 94 95# These flags are needed for modversions and compiling, so we define them here 96# already 97# $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will 98# end up in (or would, if it gets compiled in) 99# Note: Files that end up in two or more modules are compiled without the 100# KBUILD_MODNAME definition. The reason is that any made-up name would 101# differ in different configs. 102name-fix = $(subst $(comma),_,$(subst -,_,$1)) 103basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(basetarget)))" 104modname_flags = $(if $(filter 1,$(words $(modname))),\ 105 -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))") 106 107orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \ 108 $(ccflags-y) $(CFLAGS_$(basetarget).o) 109_c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags)) 110orig_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \ 111 $(asflags-y) $(AFLAGS_$(basetarget).o) 112_a_flags = $(filter-out $(AFLAGS_REMOVE_$(basetarget).o), $(orig_a_flags)) 113_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F)) 114 115# 116# Enable gcov profiling flags for a file, directory or for all files depending 117# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL 118# (in this order) 119# 120ifeq ($(CONFIG_GCOV_KERNEL),y) 121_c_flags += $(if $(patsubst n%,, \ 122 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \ 123 $(CFLAGS_GCOV)) 124endif 125 126# 127# Enable address sanitizer flags for kernel except some files or directories 128# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE) 129# 130ifeq ($(CONFIG_KASAN),y) 131_c_flags += $(if $(patsubst n%,, \ 132 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \ 133 $(CFLAGS_KASAN)) 134endif 135 136# If building the kernel in a separate objtree expand all occurrences 137# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/'). 138 139ifeq ($(KBUILD_SRC),) 140__c_flags = $(_c_flags) 141__a_flags = $(_a_flags) 142__cpp_flags = $(_cpp_flags) 143else 144 145# -I$(obj) locates generated .h files 146# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files 147# and locates generated .h files 148# FIXME: Replace both with specific CFLAGS* statements in the makefiles 149__c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags) 150__a_flags = $(call flags,_a_flags) 151__cpp_flags = $(call flags,_cpp_flags) 152endif 153 154# Modified for U-Boot: LINUXINCLUDE -> UBOOTINCLUDE 155c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(UBOOTINCLUDE) \ 156 $(__c_flags) $(modkern_cflags) \ 157 -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags) 158 159a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(UBOOTINCLUDE) \ 160 $(__a_flags) $(modkern_aflags) 161 162cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(UBOOTINCLUDE) \ 163 $(__cpp_flags) 164 165ld_flags = $(LDFLAGS) $(ldflags-y) 166 167dts_dir = $(srctree)/arch/$(ARCH)/dts 168 169# Try these files in order to find the U-Boot-specific .dtsi include file 170u_boot_dtsi_options = $(wildcard $(dts_dir)/$(basename $(notdir $<))-u-boot.dtsi) \ 171 $(wildcard $(dts_dir)/$(subst $\",,$(CONFIG_SYS_SOC))-u-boot.dtsi) \ 172 $(wildcard $(dts_dir)/$(subst $\",,$(CONFIG_SYS_CPU))-u-boot.dtsi) \ 173 $(wildcard $(dts_dir)/$(subst $\",,$(CONFIG_SYS_VENDOR))-u-boot.dtsi) \ 174 $(wildcard $(dts_dir)/u-boot.dtsi) 175 176# Uncomment for debugging 177# $(warning u_boot_dtsi_options: $(u_boot_dtsi_options)) 178 179# We use the first match 180u_boot_dtsi = $(firstword $(u_boot_dtsi_options)) 181 182# Modified for U-Boot 183dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \ 184 -I$(srctree)/arch/$(ARCH)/dts \ 185 -I$(srctree)/arch/$(ARCH)/dts/include \ 186 -Iinclude \ 187 -I$(srctree)/include \ 188 -I$(srctree)/arch/$(ARCH)/include \ 189 -include $(srctree)/include/linux/kconfig.h \ 190 -D__ASSEMBLY__ \ 191 -undef -D__DTS__ 192 193# Finds the multi-part object the current object will be linked into 194modname-multi = $(sort $(foreach m,$(multi-used),\ 195 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=)))) 196 197# Useful for describing the dependency of composite objects 198# Usage: 199# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add) 200define multi_depend 201$(foreach m, $(notdir $1), \ 202 $(eval $(obj)/$m: \ 203 $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s))))))) 204endef 205 206ifdef REGENERATE_PARSERS 207 208# GPERF 209# --------------------------------------------------------------------------- 210quiet_cmd_gperf = GPERF $@ 211 cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $< 212 213.PRECIOUS: $(src)/%.hash.c_shipped 214$(src)/%.hash.c_shipped: $(src)/%.gperf 215 $(call cmd,gperf) 216 217# LEX 218# --------------------------------------------------------------------------- 219LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy) 220 221quiet_cmd_flex = LEX $@ 222 cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $< 223 224.PRECIOUS: $(src)/%.lex.c_shipped 225$(src)/%.lex.c_shipped: $(src)/%.l 226 $(call cmd,flex) 227 228# YACC 229# --------------------------------------------------------------------------- 230YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy) 231 232quiet_cmd_bison = YACC $@ 233 cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $< 234 235.PRECIOUS: $(src)/%.tab.c_shipped 236$(src)/%.tab.c_shipped: $(src)/%.y 237 $(call cmd,bison) 238 239quiet_cmd_bison_h = YACC $@ 240 cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $< 241 242.PRECIOUS: $(src)/%.tab.h_shipped 243$(src)/%.tab.h_shipped: $(src)/%.y 244 $(call cmd,bison_h) 245 246endif 247 248# Shipped files 249# =========================================================================== 250 251quiet_cmd_shipped = SHIPPED $@ 252cmd_shipped = cat $< > $@ 253 254$(obj)/%: $(src)/%_shipped 255 $(call cmd,shipped) 256 257# Commands useful for building a boot image 258# =========================================================================== 259# 260# Use as following: 261# 262# target: source(s) FORCE 263# $(if_changed,ld/objcopy/gzip) 264# 265# and add target to extra-y so that we know we have to 266# read in the saved command line 267 268# Linking 269# --------------------------------------------------------------------------- 270 271quiet_cmd_ld = LD $@ 272cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \ 273 $(filter-out FORCE,$^) -o $@ 274 275# Objcopy 276# --------------------------------------------------------------------------- 277 278quiet_cmd_objcopy = OBJCOPY $@ 279cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@ 280 281# Gzip 282# --------------------------------------------------------------------------- 283 284quiet_cmd_gzip = GZIP $@ 285cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \ 286 (rm -f $@ ; false) 287 288# DTC 289# --------------------------------------------------------------------------- 290 291# Generate an assembly file to wrap the output of the device tree compiler 292quiet_cmd_dt_S_dtb= DTB $@ 293# Modified for U-Boot 294cmd_dt_S_dtb= \ 295( \ 296 echo '.section .dtb.init.rodata,"a"'; \ 297 echo '.balign 16'; \ 298 echo '.global __dtb_$(subst -,_,$(*F))_begin'; \ 299 echo '__dtb_$(subst -,_,$(*F))_begin:'; \ 300 echo '.incbin "$<" '; \ 301 echo '__dtb_$(subst -,_,$(*F))_end:'; \ 302 echo '.global __dtb_$(subst -,_,$(*F))_end'; \ 303 echo '.balign 16'; \ 304) > $@ 305 306$(obj)/%.dtb.S: $(obj)/%.dtb 307 $(call cmd,dt_S_dtb) 308 309quiet_cmd_dtc = DTC $@ 310# Modified for U-Boot 311# Bring in any U-Boot-specific include after the '/dts-v1/;' header 312cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \ 313 cat $< $(if $(u_boot_dtsi),\ 314 | sed 's%^/ {$$%\#include \"$(u_boot_dtsi)\"\n&%') | \ 315 $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) - ; \ 316 $(DTC) -O dtb -o $@ -b 0 \ 317 -i $(dir $<) $(DTC_FLAGS) \ 318 -d $(depfile).dtc.tmp $(dtc-tmp) ; \ 319 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile) 320 321$(obj)/%.dtb: $(src)/%.dts FORCE 322 $(call if_changed_dep,dtc) 323 324dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp) 325 326# Fonts 327# --------------------------------------------------------------------------- 328 329# Generate an assembly file to wrap the font data 330quiet_cmd_S_ttf= TTF $@ 331# Modified for U-Boot 332cmd_S_ttf= \ 333( \ 334 echo '.section .rodata.ttf.init,"a"'; \ 335 echo '.balign 16'; \ 336 echo '.global __ttf_$(*F)_begin'; \ 337 echo '__ttf_$(*F)_begin:'; \ 338 echo '.incbin "$<" '; \ 339 echo '__ttf_$(*F)_end:'; \ 340 echo '.global __ttf_$(*F)_end'; \ 341 echo '.balign 16'; \ 342) > $@ 343 344$(obj)/%.S: $(src)/%.ttf 345 $(call cmd,S_ttf) 346 347# EFI Hello World application 348# --------------------------------------------------------------------------- 349 350# Generate an assembly file to wrap the EFI app 351cmd_S_efi= \ 352( \ 353 echo '.section .rodata.efi.init,"a"'; \ 354 echo '.balign 16'; \ 355 echo '.global __efi_hello_world_begin'; \ 356 echo '__efi_hello_world_begin:'; \ 357 echo '.incbin "$<" '; \ 358 echo '__efi_hello_world_end:'; \ 359 echo '.global __efi_hello_world_end'; \ 360 echo '.balign 16'; \ 361) > $@ 362 363$(obj)/%_efi.S: $(obj)/%.efi 364 $(call cmd,S_efi) 365 366$(obj)/%.efi: $(obj)/%.so 367 $(OBJCOPY) -j .header -j .text -j .sdata -j .data -j .dynamic \ 368 -j .dynsym -j .rel* -j .rela* -j .reloc \ 369 $(if $(EFI_TARGET),$(EFI_TARGET),-O binary) $^ $@ 370 371EFI_LDS_PATH = $(srctree)/arch/$(ARCH)/lib/$(EFI_LDS) 372 373$(obj)/helloworld.so: $(EFI_LDS_PATH) 374 375$(obj)/helloworld.so: $(obj)/helloworld.o arch/$(ARCH)/lib/$(EFI_CRT0) \ 376 arch/$(ARCH)/lib/$(EFI_RELOC) 377 $(LD) -nostdlib -znocombreloc -T $(EFI_LDS_PATH) -shared -Bsymbolic \ 378 $^ -o $@ 379 380# ACPI 381# --------------------------------------------------------------------------- 382quiet_cmd_acpi_c_asl= ASL $< 383cmd_acpi_c_asl= \ 384 $(CPP) -x assembler-with-cpp -D__ASSEMBLY__ -P $(UBOOTINCLUDE) -o $<.tmp $<; \ 385 iasl -p $< -tc $<.tmp $(if $(KBUILD_VERBOSE:1=), >/dev/null); \ 386 mv $(patsubst %.asl,%.hex,$<) $@ 387 388$(obj)/dsdt.c: $(src)/dsdt.asl 389 $(call cmd,acpi_c_asl) 390 391# Bzip2 392# --------------------------------------------------------------------------- 393 394# Bzip2 and LZMA do not include size in file... so we have to fake that; 395# append the size as a 32-bit littleendian number as gzip does. 396size_append = printf $(shell \ 397dec_size=0; \ 398for F in $1; do \ 399 fsize=$$(stat -c "%s" $$F); \ 400 dec_size=$$(expr $$dec_size + $$fsize); \ 401done; \ 402printf "%08x\n" $$dec_size | \ 403 sed 's/\(..\)/\1 /g' | { \ 404 read ch0 ch1 ch2 ch3; \ 405 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \ 406 printf '%s%03o' '\\' $$((0x$$ch)); \ 407 done; \ 408 } \ 409) 410 411quiet_cmd_bzip2 = BZIP2 $@ 412cmd_bzip2 = (cat $(filter-out FORCE,$^) | \ 413 bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 414 (rm -f $@ ; false) 415 416# Lzma 417# --------------------------------------------------------------------------- 418 419quiet_cmd_lzma = LZMA $@ 420cmd_lzma = (cat $(filter-out FORCE,$^) | \ 421 lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 422 (rm -f $@ ; false) 423 424quiet_cmd_lzo = LZO $@ 425cmd_lzo = (cat $(filter-out FORCE,$^) | \ 426 lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 427 (rm -f $@ ; false) 428 429quiet_cmd_lz4 = LZ4 $@ 430cmd_lz4 = (cat $(filter-out FORCE,$^) | \ 431 lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 432 (rm -f $@ ; false) 433 434# U-Boot mkimage 435# --------------------------------------------------------------------------- 436 437MKIMAGE := $(srctree)/scripts/mkuboot.sh 438 439# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces 440# the number of overrides in arch makefiles 441UIMAGE_ARCH ?= $(SRCARCH) 442UIMAGE_COMPRESSION ?= $(if $(2),$(2),none) 443UIMAGE_OPTS-y ?= 444UIMAGE_TYPE ?= kernel 445UIMAGE_LOADADDR ?= arch_must_set_this 446UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR) 447UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)' 448UIMAGE_IN ?= $< 449UIMAGE_OUT ?= $@ 450 451quiet_cmd_uimage = UIMAGE $(UIMAGE_OUT) 452 cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \ 453 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \ 454 -T $(UIMAGE_TYPE) \ 455 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \ 456 -n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT) 457 458# XZ 459# --------------------------------------------------------------------------- 460# Use xzkern to compress the kernel image and xzmisc to compress other things. 461# 462# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage 463# of the kernel decompressor. A BCJ filter is used if it is available for 464# the target architecture. xzkern also appends uncompressed size of the data 465# using size_append. The .xz format has the size information available at 466# the end of the file too, but it's in more complex format and it's good to 467# avoid changing the part of the boot code that reads the uncompressed size. 468# Note that the bytes added by size_append will make the xz tool think that 469# the file is corrupt. This is expected. 470# 471# xzmisc doesn't use size_append, so it can be used to create normal .xz 472# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very 473# big dictionary would increase the memory usage too much in the multi-call 474# decompression mode. A BCJ filter isn't used either. 475quiet_cmd_xzkern = XZKERN $@ 476cmd_xzkern = (cat $(filter-out FORCE,$^) | \ 477 sh $(srctree)/scripts/xz_wrap.sh && \ 478 $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 479 (rm -f $@ ; false) 480 481quiet_cmd_xzmisc = XZMISC $@ 482cmd_xzmisc = (cat $(filter-out FORCE,$^) | \ 483 xz --check=crc32 --lzma2=dict=1MiB) > $@ || \ 484 (rm -f $@ ; false) 485 486# Additional commands for U-Boot 487# 488# mkimage 489# --------------------------------------------------------------------------- 490MKIMAGEOUTPUT ?= /dev/null 491quiet_cmd_mkimage = MKIMAGE $@ 492cmd_mkimage = $(objtree)/tools/mkimage $(MKIMAGEFLAGS_$(@F)) -d $< $@ \ 493 $(if $(KBUILD_VERBOSE:1=), >$(MKIMAGEOUTPUT)) 494