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Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001# SPDX-License-Identifier: GPL-2.0
Linus Torvalds1da177e2005-04-16 15:20:36 -07002# ==========================================================================
3# Building
4# ==========================================================================
5
6src := $(obj)
7
Paul Smith4f193362006-03-05 17:14:10 -05008PHONY := __build
Linus Torvalds1da177e2005-04-16 15:20:36 -07009__build:
10
Sam Ravnborgd72e5ed2007-05-28 22:47:48 +020011# Init all relevant variables used in kbuild files so
12# 1) they have correct type
13# 2) they do not inherit any value from the environment
14obj-y :=
15obj-m :=
16lib-y :=
17lib-m :=
Masahiro Yamada5f2fb522020-02-02 01:49:24 +090018always-y :=
19always-m :=
Sam Ravnborgd72e5ed2007-05-28 22:47:48 +020020targets :=
21subdir-y :=
22subdir-m :=
23EXTRA_AFLAGS :=
24EXTRA_CFLAGS :=
25EXTRA_CPPFLAGS :=
26EXTRA_LDFLAGS :=
Sam Ravnborgf77bf012007-10-15 22:25:06 +020027asflags-y :=
28ccflags-y :=
29cppflags-y :=
30ldflags-y :=
Sam Ravnborgd72e5ed2007-05-28 22:47:48 +020031
Sam Ravnborg720097d2009-04-19 11:04:26 +020032subdir-asflags-y :=
33subdir-ccflags-y :=
34
Robert P. J. Day3156fd02008-02-18 04:48:20 -050035# Read auto.conf if it exists, otherwise ignore
Roman Zippelc955cca2006-06-08 22:12:39 -070036-include include/config/auto.conf
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
Masahiro Yamada3204a7f2021-02-28 15:10:26 +090038include $(srctree)/scripts/Kbuild.include
Masahiro Yamada57fd2512021-02-28 15:10:27 +090039include $(srctree)/scripts/Makefile.compiler
Sam Ravnborg20a468b2006-01-22 13:34:15 +010040
Sam Ravnborg2a691472005-07-25 20:26:04 +000041# The filename Kbuild has precedence over Makefile
Sam Ravnborgdb8c1a72005-07-27 22:11:01 +020042kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
Sam Ravnborg0c53c8e2007-10-14 22:26:53 +020043kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
44include $(kbuild-file)
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
Masahiro Yamada3204a7f2021-02-28 15:10:26 +090046include $(srctree)/scripts/Makefile.lib
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
Masahiro Yamada85569d12020-07-29 12:15:37 +090048# Do not include hostprogs rules unless needed.
49# $(sort ...) is used here to remove duplicated words and excessive spaces.
50hostprogs := $(sort $(hostprogs))
Masahiro Yamada42640b132020-07-29 12:15:36 +090051ifneq ($(hostprogs),)
Masahiro Yamada3204a7f2021-02-28 15:10:26 +090052include $(srctree)/scripts/Makefile.host
Linus Torvalds1da177e2005-04-16 15:20:36 -070053endif
54
Masahiro Yamada7f3a59d2020-04-29 12:45:14 +090055# Do not include userprogs rules unless needed.
Masahiro Yamada85569d12020-07-29 12:15:37 +090056# $(sort ...) is used here to remove duplicated words and excessive spaces.
Masahiro Yamada7f3a59d2020-04-29 12:45:14 +090057userprogs := $(sort $(userprogs))
58ifneq ($(userprogs),)
Masahiro Yamada3204a7f2021-02-28 15:10:26 +090059include $(srctree)/scripts/Makefile.userprogs
Masahiro Yamada7f3a59d2020-04-29 12:45:14 +090060endif
61
Linus Torvalds1da177e2005-04-16 15:20:36 -070062ifndef obj
63$(warning kbuild: Makefile.build is included improperly)
64endif
65
Masahiro Yamada394053f2019-08-15 00:19:18 +090066ifeq ($(need-modorder),)
Masahiro Yamadac07d8d472019-08-08 20:21:11 +090067ifneq ($(obj-m),)
68$(warning $(patsubst %.o,'%.ko',$(obj-m)) will not be built even though obj-m is specified.)
69$(warning You cannot use subdir-y/m to visit a module Makefile. Use obj-y/m instead.)
70endif
71endif
72
Linus Torvalds1da177e2005-04-16 15:20:36 -070073# ===========================================================================
74
Masahiro Yamada454753d2020-05-22 11:00:02 +090075# subdir-builtin and subdir-modorder may contain duplications. Use $(sort ...)
Masahiro Yamadaaaa385b2020-05-22 11:00:01 +090076subdir-builtin := $(sort $(filter %/built-in.a, $(real-obj-y)))
Masahiro Yamadab2c88552020-06-01 14:57:00 +090077subdir-modorder := $(sort $(filter %/modules.order, $(obj-m)))
Masahiro Yamada6ba3bcb2020-05-22 11:00:00 +090078
Masahiro Yamadaf3908ab2020-06-01 14:56:56 +090079targets-for-builtin := $(extra-y)
80
Masahiro Yamadaa4954fd2014-09-09 19:26:21 +090081ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
Masahiro Yamadaf3908ab2020-06-01 14:56:56 +090082targets-for-builtin += $(obj)/lib.a
Linus Torvalds1da177e2005-04-16 15:20:36 -070083endif
84
Masahiro Yamada56d58932019-12-19 01:04:28 +090085ifdef need-builtin
Masahiro Yamadaf3908ab2020-06-01 14:56:56 +090086targets-for-builtin += $(obj)/built-in.a
Linus Torvalds1da177e2005-04-16 15:20:36 -070087endif
88
Masahiro Yamadab2c88552020-06-01 14:57:00 +090089targets-for-modules := $(patsubst %.o, %.mod, $(filter %.o, $(obj-m)))
Masahiro Yamadaf3908ab2020-06-01 14:56:56 +090090
Masahiro Yamadab480fec2020-05-22 10:59:59 +090091ifdef need-modorder
Masahiro Yamadaf3908ab2020-06-01 14:56:56 +090092targets-for-modules += $(obj)/modules.order
Masahiro Yamada1d8001e2019-02-14 12:05:15 +090093endif
Tejun Heo551559e2007-12-07 21:04:30 +090094
Masahiro Yamadaf3908ab2020-06-01 14:56:56 +090095targets += $(targets-for-builtin) $(targets-for-modules)
Masahiro Yamada9f69a492019-07-17 15:18:00 +090096
Linus Torvalds1da177e2005-04-16 15:20:36 -070097# Linus' kernel sanity checking tool
Masahiro Yamada7d0ea252018-10-10 00:05:39 +090098ifeq ($(KBUILD_CHECKSRC),1)
99 quiet_cmd_checksrc = CHECK $<
Masahiro Yamadae5d28912018-11-30 10:05:28 +0900100 cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $<
Masahiro Yamada7d0ea252018-10-10 00:05:39 +0900101else ifeq ($(KBUILD_CHECKSRC),2)
102 quiet_cmd_force_checksrc = CHECK $<
Masahiro Yamadae5d28912018-11-30 10:05:28 +0900103 cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104endif
105
Masahiro Yamadae27128d2019-09-01 01:25:55 +0900106ifneq ($(KBUILD_EXTRA_WARN),)
Masahiro Yamadae5d28912018-11-30 10:05:28 +0900107 cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $<
Matthew Wilcox3a025e12017-11-20 10:40:40 -0800108endif
109
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110# Compile C sources (.c)
111# ---------------------------------------------------------------------------
112
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
Sami Tolvanendc5723b2020-12-11 10:46:19 -0800114 cmd_cc_s_c = $(CC) $(filter-out $(DEBUG_CFLAGS) $(CC_FLAGS_LTO), $(c_flags)) -fverbose-asm -S -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115
Sam Ravnborg767e5812007-05-06 09:23:45 +0200116$(obj)/%.s: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 $(call if_changed_dep,cc_s_c)
118
Masahiro Yamada23d43842016-04-08 11:24:47 +0900119quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@
120cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
Sam Ravnborg767e5812007-05-06 09:23:45 +0200122$(obj)/%.i: $(src)/%.c FORCE
Masahiro Yamada23d43842016-04-08 11:24:47 +0900123 $(call if_changed_dep,cpp_i_c)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100125# These mirror gensymtypes_S and co below, keep them in synch.
126cmd_gensymtypes_c = \
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100127 $(CPP) -D__GENKSYMS__ $(c_flags) $< | \
Masahiro Yamada88110712019-02-20 12:38:31 +0900128 scripts/genksyms/genksyms $(if $(1), -T $(2)) \
Ard Biesheuvel56067812017-02-03 09:54:05 +0000129 $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100130 $(if $(KBUILD_PRESERVE),-p) \
Don Zickuse26d6b82010-05-24 17:07:24 -0400131 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100132
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200133quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100134cmd_cc_symtypes_c = \
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100135 $(call cmd_gensymtypes_c,true,$@) >/dev/null; \
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100136 test -s $@ || rm -f $@
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200137
Sam Ravnborg767e5812007-05-06 09:23:45 +0200138$(obj)/%.symtypes : $(src)/%.c FORCE
Andreas Gruenbacher64e6c1e2008-12-01 14:21:01 -0800139 $(call cmd,cc_symtypes_c)
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200140
Vinícius Tinti433db3e2017-04-24 13:04:58 -0700141# LLVM assembly
142# Generate .ll files from .c
143quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@
144 cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $<
145
146$(obj)/%.ll: $(src)/%.c FORCE
147 $(call if_changed_dep,cc_ll_c)
148
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149# C (.c) files
150# The C file is compiled and updated dependency information is generated.
151# (See cmd_cc_o_c + relevant part of rule_cc_o_c)
152
153quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
Masahiro Yamadaee3e46b2018-11-30 10:05:25 +0900154 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
Masahiro Yamadaee3e46b2018-11-30 10:05:25 +0900156ifdef CONFIG_MODVERSIONS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157# When module versioning is enabled the following steps are executed:
Masahiro Yamadaee3e46b2018-11-30 10:05:25 +0900158# o compile a <file>.o from <file>.c
159# o if <file>.o doesn't contain a __ksymtab version, i.e. does
160# not export symbols, it's done.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161# o otherwise, we calculate symbol versions using the good old
162# genksyms on the preprocessed source and postprocess them in a way
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100163# that they are usable as a linker script
Masahiro Yamadaee3e46b2018-11-30 10:05:25 +0900164# o generate .tmp_<file>.o from <file>.o using the linker to
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100165# replace the unresolved symbols __crc_exported_symbol with
166# the actual value of the checksum generated by genksyms
Masahiro Yamadaee3e46b2018-11-30 10:05:25 +0900167# o remove .tmp_<file>.o to <file>.o
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100168
Sami Tolvanen38e89182020-12-11 10:46:20 -0800169ifdef CONFIG_LTO_CLANG
170# Generate .o.symversions files for each .o with exported symbols, and link these
171# to the kernel and/or modules at the end.
172cmd_modversions_c = \
173 if $(NM) $@ 2>/dev/null | grep -q __ksymtab; then \
174 $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
175 > $@.symversions; \
176 fi;
177else
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100178cmd_modversions_c = \
Masahiro Yamadaee3e46b2018-11-30 10:05:25 +0900179 if $(OBJDUMP) -h $@ | grep -q __ksymtab; then \
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100180 $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
Don Zickuse26d6b82010-05-24 17:07:24 -0400181 > $(@D)/.tmp_$(@F:.o=.ver); \
182 \
Masahiro Yamadaee3e46b2018-11-30 10:05:25 +0900183 $(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@ \
Don Zickuse26d6b82010-05-24 17:07:24 -0400184 -T $(@D)/.tmp_$(@F:.o=.ver); \
Don Zickuse26d6b82010-05-24 17:07:24 -0400185 mv -f $(@D)/.tmp_$(@F) $@; \
Masahiro Yamadaee3e46b2018-11-30 10:05:25 +0900186 rm -f $(@D)/.tmp_$(@F:.o=.ver); \
Masahiro Yamadae5d28912018-11-30 10:05:28 +0900187 fi
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188endif
Sami Tolvanen38e89182020-12-11 10:46:20 -0800189endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190
Sami Tolvanen3b15cdc12020-12-11 10:46:18 -0800191ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
Vasily Gorbik07d04082018-08-06 15:17:44 +0200192# compiler will not generate __mcount_loc use recordmcount or recordmcount.pl
Steven Rostedt72441cb2010-10-13 17:12:30 -0400193ifdef BUILD_C_RECORDMCOUNT
Steven Rostedt85356f82011-04-12 18:59:10 -0400194ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
195 RECORDMCOUNT_FLAGS = -w
196endif
Steven Rostedtd7b4d6d2010-10-18 14:42:00 -0400197# Due to recursion, we must skip empty.o.
198# The empty.o file is created in the make process in order to determine
Cao jin312a3d02017-08-02 10:31:06 +0800199# the target endianness and word size. It is made before all other C
200# files, including recordmcount.
Wu Zhangjin45677452010-10-28 00:24:34 +0800201sub_cmd_record_mcount = \
202 if [ $(@) != "scripts/mod/empty.o" ]; then \
Steven Rostedt85356f82011-04-12 18:59:10 -0400203 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
Wu Zhangjin45677452010-10-28 00:24:34 +0800204 fi;
Michal Marekd6971822011-05-17 15:36:46 +0200205recordmcount_source := $(srctree)/scripts/recordmcount.c \
206 $(srctree)/scripts/recordmcount.h
Steven Rostedt72441cb2010-10-13 17:12:30 -0400207else
Masahiro Yamada4317ee32018-11-30 10:05:24 +0900208sub_cmd_record_mcount = perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
Wu Zhangjine6299d22009-11-20 20:34:31 +0800209 "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
Steven Rostedtb3acf292008-10-29 15:30:26 -0400210 "$(if $(CONFIG_64BIT),64,32)" \
Joel Stanley5a4630a2018-09-17 17:07:54 +0930211 "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)" \
Masahiro Yamadad503ac52018-08-24 08:20:39 +0900212 "$(LD) $(KBUILD_LDFLAGS)" "$(NM)" "$(RM)" "$(MV)" \
Shaohua Li18c167f2009-01-12 10:00:51 +0800213 "$(if $(part-of-module),1,0)" "$(@)";
Michal Marekd6971822011-05-17 15:36:46 +0200214recordmcount_source := $(srctree)/scripts/recordmcount.pl
Cao jin312a3d02017-08-02 10:31:06 +0800215endif # BUILD_C_RECORDMCOUNT
Joe Lawrence1a49b2f2019-03-26 10:50:28 -0400216cmd_record_mcount = $(if $(findstring $(strip $(CC_FLAGS_FTRACE)),$(_c_flags)), \
217 $(sub_cmd_record_mcount))
Sami Tolvanen3b15cdc12020-12-11 10:46:18 -0800218endif # CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
Steven Rostedt8da38212008-08-14 15:45:07 -0400219
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600220ifdef CONFIG_STACK_VALIDATION
Sami Tolvanenb1a1a1a2020-04-13 16:10:13 -0700221ifndef CONFIG_LTO_CLANG
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600222
223__objtool_obj := $(objtree)/tools/objtool/objtool
224
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600225# 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
226# 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file
227# 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file
228cmd_objtool = $(if $(patsubst y%,, \
229 $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
Masahiro Yamadae5d28912018-11-30 10:05:28 +0900230 $(__objtool_obj) $(objtool_args) $@)
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600231objtool_obj = $(if $(patsubst y%,, \
232 $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
233 $(__objtool_obj))
234
Sami Tolvanenb1a1a1a2020-04-13 16:10:13 -0700235endif # CONFIG_LTO_CLANG
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600236endif # CONFIG_STACK_VALIDATION
237
Josh Poimboeufee9f8fc2017-07-24 18:36:57 -0500238# Rebuild all objects when objtool changes, or is enabled/disabled.
239objtool_dep = $(objtool_obj) \
Alexey Dobriyan0e0345b2021-04-15 20:36:07 +0300240 $(wildcard include/config/ORC_UNWINDER \
241 include/config/STACK_VALIDATION)
Josh Poimboeufee9f8fc2017-07-24 18:36:57 -0500242
Masahiro Yamadabbda5ec2018-11-30 10:05:26 +0900243ifdef CONFIG_TRIM_UNUSED_KSYMS
244cmd_gen_ksymdeps = \
Masahiro Yamadae5d28912018-11-30 10:05:28 +0900245 $(CONFIG_SHELL) $(srctree)/scripts/gen_ksymdeps.sh $@ >> $(dot-target).cmd
Masahiro Yamada7d323582020-12-04 02:55:51 +0900246
247# List module undefined symbols
248undefined_syms = $(NM) $< | $(AWK) '$$1 == "U" { printf("%s%s", x++ ? " " : "", $$2) }';
Masahiro Yamadabbda5ec2018-11-30 10:05:26 +0900249endif
250
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251define rule_cc_o_c
Masahiro Yamada3a2429e2018-11-30 10:05:27 +0900252 $(call cmd_and_fixdep,cc_o_c)
253 $(call cmd,gen_ksymdeps)
Luc Van Oostenryck0c33f122020-06-22 17:45:12 +0200254 $(call cmd,checksrc)
Masahiro Yamada3a2429e2018-11-30 10:05:27 +0900255 $(call cmd,checkdoc)
256 $(call cmd,objtool)
257 $(call cmd,modversions_c)
258 $(call cmd,record_mcount)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259endef
260
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600261define rule_as_o_S
Masahiro Yamada3a2429e2018-11-30 10:05:27 +0900262 $(call cmd_and_fixdep,as_o_S)
263 $(call cmd,gen_ksymdeps)
264 $(call cmd,objtool)
265 $(call cmd,modversions_S)
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600266endef
267
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268# Built-in and composite module parts
Josh Poimboeuf8852c552021-05-18 18:59:15 -0500269.SECONDEXPANSION:
270$(obj)/%.o: $(src)/%.c $(recordmcount_source) $$(objtool_dep) FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 $(call if_changed_rule,cc_o_c)
Luc Van Oostenryck0c33f122020-06-22 17:45:12 +0200272 $(call cmd,force_checksrc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273
Masahiro Yamada9f69a492019-07-17 15:18:00 +0900274cmd_mod = { \
275 echo $(if $($*-objs)$($*-y)$($*-m), $(addprefix $(obj)/, $($*-objs) $($*-y) $($*-m)), $(@:.mod=.o)); \
Masahiro Yamada7d323582020-12-04 02:55:51 +0900276 $(undefined_syms) echo; \
Masahiro Yamada9f69a492019-07-17 15:18:00 +0900277 } > $@
278
279$(obj)/%.mod: $(obj)/%.o FORCE
280 $(call if_changed,mod)
281
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282quiet_cmd_cc_lst_c = MKLST $@
283 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
284 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
285 System.map $(OBJDUMP) > $@
286
Sam Ravnborg767e5812007-05-06 09:23:45 +0200287$(obj)/%.lst: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 $(call if_changed_dep,cc_lst_c)
289
290# Compile assembler sources (.S)
291# ---------------------------------------------------------------------------
292
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100293# .S file exports must have their C prototypes defined in asm/asm-prototypes.h
294# or a file that it includes, in order to get versioned symbols. We build a
295# dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
296# the .S file (with trailing ';'), and run genksyms on that, to extract vers.
297#
298# This is convoluted. The .S file must first be preprocessed to run guards and
299# expand names, then the resulting exports must be constructed into plain
300# EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
301# to make the genksyms input.
302#
303# These mirror gensymtypes_c and co above, keep them in synch.
304cmd_gensymtypes_S = \
Masahiro Yamadab79c6aa2019-01-17 19:02:44 +0900305 { echo "\#include <linux/kernel.h>" ; \
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100306 echo "\#include <asm/asm-prototypes.h>" ; \
307 $(CPP) $(a_flags) $< | \
Nicholas Piggincc6acc12016-11-09 15:34:05 +1100308 grep "\<___EXPORT_SYMBOL\>" | \
Masahiro Yamadab79c6aa2019-01-17 19:02:44 +0900309 sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ; } | \
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100310 $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | \
Masahiro Yamada88110712019-02-20 12:38:31 +0900311 scripts/genksyms/genksyms $(if $(1), -T $(2)) \
Ard Biesheuvel56067812017-02-03 09:54:05 +0000312 $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100313 $(if $(KBUILD_PRESERVE),-p) \
314 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
315
316quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@
317cmd_cc_symtypes_S = \
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100318 $(call cmd_gensymtypes_S,true,$@) >/dev/null; \
319 test -s $@ || rm -f $@
320
321$(obj)/%.symtypes : $(src)/%.S FORCE
322 $(call cmd,cc_symtypes_S)
323
324
Masahiro Yamadae0f41e52016-04-08 11:24:48 +0900325quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
326cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327
Sam Ravnborg767e5812007-05-06 09:23:45 +0200328$(obj)/%.s: $(src)/%.S FORCE
Masahiro Yamadae0f41e52016-04-08 11:24:48 +0900329 $(call if_changed_dep,cpp_s_S)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
331quiet_cmd_as_o_S = AS $(quiet_modtag) $@
Masahiro Yamadaee3e46b2018-11-30 10:05:25 +0900332 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100333
Masahiro Yamada2ff2b7e2019-08-19 14:54:20 +0900334ifdef CONFIG_ASM_MODVERSIONS
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100335
336# versioning matches the C process described above, with difference that
337# we parse asm-prototypes.h C header to get function definitions.
338
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100339cmd_modversions_S = \
Masahiro Yamadaee3e46b2018-11-30 10:05:25 +0900340 if $(OBJDUMP) -h $@ | grep -q __ksymtab; then \
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100341 $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
342 > $(@D)/.tmp_$(@F:.o=.ver); \
343 \
Masahiro Yamadaee3e46b2018-11-30 10:05:25 +0900344 $(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@ \
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100345 -T $(@D)/.tmp_$(@F:.o=.ver); \
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100346 mv -f $(@D)/.tmp_$(@F) $@; \
Masahiro Yamadaee3e46b2018-11-30 10:05:25 +0900347 rm -f $(@D)/.tmp_$(@F:.o=.ver); \
Masahiro Yamadae5d28912018-11-30 10:05:28 +0900348 fi
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100349endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350
Josh Poimboeuf8852c552021-05-18 18:59:15 -0500351$(obj)/%.o: $(src)/%.S $$(objtool_dep) FORCE
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600352 $(call if_changed_rule,as_o_S)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353
Masahiro Yamadab2c88552020-06-01 14:57:00 +0900354targets += $(filter-out $(subdir-builtin), $(real-obj-y))
355targets += $(filter-out $(subdir-modorder), $(real-obj-m))
Masahiro Yamadabcf0c662021-05-03 03:09:56 +0900356targets += $(real-dtb-y) $(lib-y) $(always-y) $(MAKECMDGOALS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357
358# Linker scripts preprocessor (.lds.S -> .lds)
359# ---------------------------------------------------------------------------
360quiet_cmd_cpp_lds_S = LDS $@
Linus Torvalds5cb05122017-11-02 14:10:37 -0700361 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \
Tim Abbott42f29a22009-09-20 18:14:12 -0400362 -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363
Sam Ravnborg767e5812007-05-06 09:23:45 +0200364$(obj)/%.lds: $(src)/%.lds.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 $(call if_changed_dep,cpp_lds_S)
366
David Howells4520c6a2012-09-21 23:31:13 +0100367# ASN.1 grammar
368# ---------------------------------------------------------------------------
Masahiro Yamada49d50892019-07-21 01:27:38 +0900369quiet_cmd_asn1_compiler = ASN.1 $(basename $@).[ch]
David Howells4520c6a2012-09-21 23:31:13 +0100370 cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
Masahiro Yamada49d50892019-07-21 01:27:38 +0900371 $(basename $@).c $(basename $@).h
David Howells4520c6a2012-09-21 23:31:13 +0100372
Masahiro Yamada4fa8bc92018-03-23 22:04:37 +0900373$(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
David Howells4520c6a2012-09-21 23:31:13 +0100374 $(call cmd,asn1_compiler)
375
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376# Build the compiled-in targets
377# ---------------------------------------------------------------------------
378
379# To build objects in subdirs, we need to descend into the directories
Masahiro Yamadaaaa385b2020-05-22 11:00:01 +0900380$(subdir-builtin): $(obj)/%/built-in.a: $(obj)/% ;
Masahiro Yamada454753d2020-05-22 11:00:02 +0900381$(subdir-modorder): $(obj)/%/modules.order: $(obj)/% ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382
Sami Tolvanen38e89182020-12-11 10:46:20 -0800383# combine symversions for later processing
384quiet_cmd_update_lto_symversions = SYMVER $@
385ifeq ($(CONFIG_LTO_CLANG) $(CONFIG_MODVERSIONS),y y)
386 cmd_update_lto_symversions = \
387 rm -f $@.symversions \
388 $(foreach n, $(filter-out FORCE,$^), \
Lecopzer Chen1d110532021-07-15 15:37:16 +0800389 $(if $(shell test -s $(n).symversions && echo y), \
Sami Tolvanen38e89182020-12-11 10:46:20 -0800390 ; cat $(n).symversions >> $@.symversions))
391else
392 cmd_update_lto_symversions = echo >/dev/null
393endif
394
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395#
Masahiro Yamadadee94952019-01-17 09:10:03 +0900396# Rule to compile a set of .o files into one .a file (without symbol table)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397#
Stephen Rothwella5967db2016-08-24 22:29:19 +1000398
Masahiro Yamada5e18f022018-03-19 20:26:12 +0900399quiet_cmd_ar_builtin = AR $@
Masahiro Yamada13dc8c02019-09-21 15:49:54 +0900400 cmd_ar_builtin = rm -f $@; $(AR) cDPrST $@ $(real-prereqs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
Sami Tolvanen38e89182020-12-11 10:46:20 -0800402quiet_cmd_ar_and_symver = AR $@
403 cmd_ar_and_symver = $(cmd_update_lto_symversions); $(cmd_ar_builtin)
404
Masahiro Yamadae578edc2020-05-22 10:59:58 +0900405$(obj)/built-in.a: $(real-obj-y) FORCE
Sami Tolvanen38e89182020-12-11 10:46:20 -0800406 $(call if_changed,ar_and_symver)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408#
Tejun Heo551559e2007-12-07 21:04:30 +0900409# Rule to create modules.order file
410#
411# Create commands to either record .ko file or cat modules.order from
412# a subdirectory
Masahiro Yamadab2c88552020-06-01 14:57:00 +0900413# Add $(obj-m) as the prerequisite to avoid updating the timestamp of
414# modules.order unless contained modules are updated.
415
416cmd_modules_order = { $(foreach m, $(real-prereqs), \
417 $(if $(filter %/modules.order, $m), cat $m, echo $(patsubst %.o,%.ko,$m));) :; } \
Masahiro Yamadae0e1b1e2019-07-17 15:17:51 +0900418 | $(AWK) '!x[$$0]++' - > $@
Tejun Heo551559e2007-12-07 21:04:30 +0900419
Masahiro Yamadab2c88552020-06-01 14:57:00 +0900420$(obj)/modules.order: $(obj-m) FORCE
421 $(call if_changed,modules_order)
422
Tejun Heo551559e2007-12-07 21:04:30 +0900423#
Masahiro Yamadadee94952019-01-17 09:10:03 +0900424# Rule to compile a set of .o files into one .a file (with symbol table)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425#
Sami Tolvanen38e89182020-12-11 10:46:20 -0800426quiet_cmd_ar_lib = AR $@
427 cmd_ar_lib = $(cmd_update_lto_symversions); $(cmd_ar)
428
Masahiro Yamadae578edc2020-05-22 10:59:58 +0900429$(obj)/lib.a: $(lib-y) FORCE
Sami Tolvanen38e89182020-12-11 10:46:20 -0800430 $(call if_changed,ar_lib)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431
Masahiro Yamadaafa974b2019-01-17 19:02:43 +0900432# NOTE:
433# Do not replace $(filter %.o,^) with $(real-prereqs). When a single object
434# module is turned into a multi object module, $^ will contain header file
435# dependencies recorded in the .*.cmd file.
Sami Tolvanendc5723b2020-12-11 10:46:19 -0800436ifdef CONFIG_LTO_CLANG
437quiet_cmd_link_multi-m = AR [M] $@
438cmd_link_multi-m = \
Sami Tolvanen38e89182020-12-11 10:46:20 -0800439 $(cmd_update_lto_symversions); \
Sami Tolvanendc5723b2020-12-11 10:46:19 -0800440 rm -f $@; \
441 $(AR) cDPrsT $@ $(filter %.o,$^)
442else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443quiet_cmd_link_multi-m = LD [M] $@
Masahiro Yamadab7dca6d2019-07-17 15:17:57 +0900444 cmd_link_multi-m = $(LD) $(ld_flags) -r -o $@ $(filter %.o,$^)
Sami Tolvanendc5723b2020-12-11 10:46:19 -0800445endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446
Masahiro Yamadaa6601e02021-03-06 15:11:20 +0900447$(multi-obj-m): FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 $(call if_changed,link_multi-m)
Masahiro Yamadaa6601e02021-03-06 15:11:20 +0900449$(call multi_depend, $(multi-obj-m), .o, -objs -y -m)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450
Masahiro Yamadaa6601e02021-03-06 15:11:20 +0900451targets += $(multi-obj-m)
Masahiro Yamada591f6682017-11-13 19:29:36 +0900452targets := $(filter-out $(PHONY), $(targets))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453
Masahiro Yamadab23d1a22018-03-23 22:04:33 +0900454# Add intermediate targets:
455# When building objects with specific suffix patterns, add intermediate
456# targets that the final targets are derived from.
457intermediate_targets = $(foreach sfx, $(2), \
458 $(patsubst %$(strip $(1)),%$(sfx), \
459 $(filter %$(strip $(1)), $(targets))))
Masahiro Yamada54a702f2018-03-23 22:04:39 +0900460# %.asn1.o <- %.asn1.[ch] <- %.asn1
Masahiro Yamadaa7f92412018-03-23 22:04:34 +0900461# %.dtb.o <- %.dtb.S <- %.dtb <- %.dts
Masahiro Yamadab23d1a22018-03-23 22:04:33 +0900462# %.lex.o <- %.lex.c <- %.l
463# %.tab.o <- %.tab.[ch] <- %.y
Masahiro Yamada54a702f2018-03-23 22:04:39 +0900464targets += $(call intermediate_targets, .asn1.o, .asn1.c .asn1.h) \
465 $(call intermediate_targets, .dtb.o, .dtb.S .dtb) \
Masahiro Yamadaa7f92412018-03-23 22:04:34 +0900466 $(call intermediate_targets, .lex.o, .lex.c) \
Masahiro Yamadab23d1a22018-03-23 22:04:33 +0900467 $(call intermediate_targets, .tab.o, .tab.c .tab.h)
468
Masahiro Yamada394053f2019-08-15 00:19:18 +0900469# Build
470# ---------------------------------------------------------------------------
471
472ifdef single-build
473
Masahiro Yamada20312622019-10-16 14:15:46 +0900474KBUILD_SINGLE_TARGETS := $(filter $(obj)/%, $(KBUILD_SINGLE_TARGETS))
475
Masahiro Yamada394053f2019-08-15 00:19:18 +0900476curdir-single := $(sort $(foreach x, $(KBUILD_SINGLE_TARGETS), \
477 $(if $(filter $(x) $(basename $(x)).o, $(targets)), $(x))))
478
479# Handle single targets without any rule: show "Nothing to be done for ..." or
480# "No rule to make target ..." depending on whether the target exists.
481unknown-single := $(filter-out $(addsuffix /%, $(subdir-ym)), \
Masahiro Yamada20312622019-10-16 14:15:46 +0900482 $(filter-out $(curdir-single), $(KBUILD_SINGLE_TARGETS)))
Masahiro Yamada394053f2019-08-15 00:19:18 +0900483
Masahiro Yamada2dffd232019-10-16 14:15:47 +0900484single-subdirs := $(foreach d, $(subdir-ym), \
485 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
486
487__build: $(curdir-single) $(single-subdirs)
Masahiro Yamada394053f2019-08-15 00:19:18 +0900488ifneq ($(unknown-single),)
489 $(Q)$(MAKE) -f /dev/null $(unknown-single)
490endif
491 @:
492
493ifeq ($(curdir-single),)
494# Nothing to do in this directory. Do not include any .*.cmd file for speed-up
495targets :=
496else
497targets += $(curdir-single)
498endif
499
500else
501
Masahiro Yamadaf3908ab2020-06-01 14:56:56 +0900502__build: $(if $(KBUILD_BUILTIN), $(targets-for-builtin)) \
503 $(if $(KBUILD_MODULES), $(targets-for-modules)) \
Masahiro Yamada5f2fb522020-02-02 01:49:24 +0900504 $(subdir-ym) $(always-y)
Masahiro Yamada394053f2019-08-15 00:19:18 +0900505 @:
506
507endif
508
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509# Descending
510# ---------------------------------------------------------------------------
511
Paul Smith4f193362006-03-05 17:14:10 -0500512PHONY += $(subdir-ym)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513$(subdir-ym):
Masahiro Yamadad9f78ed2019-08-06 19:03:21 +0900514 $(Q)$(MAKE) $(build)=$@ \
Masahiro Yamada394053f2019-08-15 00:19:18 +0900515 $(if $(filter $@/, $(KBUILD_SINGLE_TARGETS)),single-build=) \
Masahiro Yamadaaaa385b2020-05-22 11:00:01 +0900516 need-builtin=$(if $(filter $@/built-in.a, $(subdir-builtin)),1) \
Masahiro Yamada454753d2020-05-22 11:00:02 +0900517 need-modorder=$(if $(filter $@/modules.order, $(subdir-modorder)),1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518
519# Add FORCE to the prequisites of a target to force it to be always rebuilt.
520# ---------------------------------------------------------------------------
521
Paul Smith4f193362006-03-05 17:14:10 -0500522PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523
524FORCE:
525
526# Read all saved command lines and dependencies for the $(targets) we
527# may be building above, using $(if_changed{,_dep}). As an
528# optimization, we don't need to read them if the target does not
529# exist, we will rebuild anyway in that case.
530
Masahiro Yamada392885e2018-11-30 10:05:22 +0900531existing-targets := $(wildcard $(sort $(targets)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532
Masahiro Yamada392885e2018-11-30 10:05:22 +0900533-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
Paul Smith4f193362006-03-05 17:14:10 -0500534
Masahiro Yamada8a787562017-11-13 19:29:37 +0900535# Create directories for object files if they do not exist
Masahiro Yamadacc8a51c2020-07-01 12:29:51 +0900536obj-dirs := $(sort $(patsubst %/,%, $(dir $(targets))))
Masahiro Yamada392885e2018-11-30 10:05:22 +0900537# If targets exist, their directories apparently exist. Skip mkdir.
538existing-dirs := $(sort $(patsubst %/,%, $(dir $(existing-targets))))
539obj-dirs := $(strip $(filter-out $(existing-dirs), $(obj-dirs)))
Masahiro Yamadac4da7ed2017-11-13 19:29:38 +0900540ifneq ($(obj-dirs),)
Masahiro Yamada8a787562017-11-13 19:29:37 +0900541$(shell mkdir -p $(obj-dirs))
542endif
543
Paul Smith4f193362006-03-05 17:14:10 -0500544.PHONY: $(PHONY)