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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 :=
18always :=
19targets :=
20subdir-y :=
21subdir-m :=
22EXTRA_AFLAGS :=
23EXTRA_CFLAGS :=
24EXTRA_CPPFLAGS :=
25EXTRA_LDFLAGS :=
Sam Ravnborgf77bf012007-10-15 22:25:06 +020026asflags-y :=
27ccflags-y :=
28cppflags-y :=
29ldflags-y :=
Sam Ravnborgd72e5ed2007-05-28 22:47:48 +020030
Sam Ravnborg720097d2009-04-19 11:04:26 +020031subdir-asflags-y :=
32subdir-ccflags-y :=
33
Robert P. J. Day3156fd02008-02-18 04:48:20 -050034# Read auto.conf if it exists, otherwise ignore
Roman Zippelc955cca2006-06-08 22:12:39 -070035-include include/config/auto.conf
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
Sam Ravnborg20a468b2006-01-22 13:34:15 +010037include scripts/Kbuild.include
38
Sam Ravnborg2a691472005-07-25 20:26:04 +000039# The filename Kbuild has precedence over Makefile
Sam Ravnborgdb8c1a72005-07-27 22:11:01 +020040kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
Sam Ravnborg0c53c8e2007-10-14 22:26:53 +020041kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
42include $(kbuild-file)
Linus Torvalds1da177e2005-04-16 15:20:36 -070043
44include scripts/Makefile.lib
45
Robert P. J. Day3156fd02008-02-18 04:48:20 -050046# Do not include host rules unless needed
Emese Revfy24403872016-05-24 00:08:25 +020047ifneq ($(hostprogs-y)$(hostprogs-m)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-m),)
Linus Torvalds1da177e2005-04-16 15:20:36 -070048include scripts/Makefile.host
49endif
50
Linus Torvalds1da177e2005-04-16 15:20:36 -070051ifndef obj
52$(warning kbuild: Makefile.build is included improperly)
53endif
54
55# ===========================================================================
56
Masahiro Yamadaa4954fd2014-09-09 19:26:21 +090057ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
Linus Torvalds1da177e2005-04-16 15:20:36 -070058lib-target := $(obj)/lib.a
Masahiro Yamadaf98fe472018-03-19 20:26:08 +090059real-obj-y += $(obj)/lib-ksyms.o
Linus Torvalds1da177e2005-04-16 15:20:36 -070060endif
61
Masahiro Yamadaf98fe472018-03-19 20:26:08 +090062ifneq ($(strip $(real-obj-y) $(need-builtin)),)
Nicholas Pigginf49821e2018-02-11 00:25:04 +100063builtin-target := $(obj)/built-in.a
Linus Torvalds1da177e2005-04-16 15:20:36 -070064endif
65
Tejun Heo551559e2007-12-07 21:04:30 +090066modorder-target := $(obj)/modules.order
67
Linus Torvalds1da177e2005-04-16 15:20:36 -070068# We keep a list of all modules in $(MODVERDIR)
69
70__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
Tejun Heo551559e2007-12-07 21:04:30 +090071 $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 $(subdir-ym) $(always)
73 @:
74
75# Linus' kernel sanity checking tool
76ifneq ($(KBUILD_CHECKSRC),0)
77 ifeq ($(KBUILD_CHECKSRC),2)
78 quiet_cmd_force_checksrc = CHECK $<
79 cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
80 else
81 quiet_cmd_checksrc = CHECK $<
82 cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
83 endif
84endif
85
Matthew Wilcox3a025e12017-11-20 10:40:40 -080086ifneq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),)
87 cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $< ;
88endif
89
Nicholas Pigginf49821e2018-02-11 00:25:04 +100090# Do section mismatch analysis for each module/built-in.a
Sam Ravnborg91341d42008-01-21 21:31:44 +010091ifdef CONFIG_DEBUG_SECTION_MISMATCH
92 cmd_secanalysis = ; scripts/mod/modpost $@
93endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
95# Compile C sources (.c)
96# ---------------------------------------------------------------------------
97
98# Default is built-in, unless we know otherwise
Sam Ravnborg65881692010-07-28 17:33:09 +020099modkern_cflags = \
100 $(if $(part-of-module), \
101 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200102 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103quiet_modtag := $(empty) $(empty)
104
Masahiro Yamadaf5f33682018-03-19 20:26:07 +0900105$(real-obj-m) : part-of-module := y
106$(real-obj-m:.o=.i) : part-of-module := y
107$(real-obj-m:.o=.s) : part-of-module := y
108$(real-obj-m:.o=.lst): part-of-module := y
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
Masahiro Yamadaf5f33682018-03-19 20:26:07 +0900110$(real-obj-m) : quiet_modtag := [M]
111$(real-obj-m:.o=.i) : quiet_modtag := [M]
112$(real-obj-m:.o=.s) : quiet_modtag := [M]
113$(real-obj-m:.o=.lst): quiet_modtag := [M]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
Masahiro Yamadaf5f33682018-03-19 20:26:07 +0900115$(obj-m) : quiet_modtag := [M]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
Andi Kleen1e64ff42014-02-08 09:01:15 +0100118cmd_cc_s_c = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
Sam Ravnborg767e5812007-05-06 09:23:45 +0200120$(obj)/%.s: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 $(call if_changed_dep,cc_s_c)
122
Masahiro Yamada23d43842016-04-08 11:24:47 +0900123quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@
124cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
Sam Ravnborg767e5812007-05-06 09:23:45 +0200126$(obj)/%.i: $(src)/%.c FORCE
Masahiro Yamada23d43842016-04-08 11:24:47 +0900127 $(call if_changed_dep,cpp_i_c)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100129# These mirror gensymtypes_S and co below, keep them in synch.
130cmd_gensymtypes_c = \
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100131 $(CPP) -D__GENKSYMS__ $(c_flags) $< | \
James Hogand70f82a2013-03-18 19:38:56 +1030132 $(GENKSYMS) $(if $(1), -T $(2)) \
Ard Biesheuvel56067812017-02-03 09:54:05 +0000133 $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100134 $(if $(KBUILD_PRESERVE),-p) \
Don Zickuse26d6b82010-05-24 17:07:24 -0400135 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100136
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200137quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100138cmd_cc_symtypes_c = \
139 set -e; \
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100140 $(call cmd_gensymtypes_c,true,$@) >/dev/null; \
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100141 test -s $@ || rm -f $@
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200142
Sam Ravnborg767e5812007-05-06 09:23:45 +0200143$(obj)/%.symtypes : $(src)/%.c FORCE
Andreas Gruenbacher64e6c1e2008-12-01 14:21:01 -0800144 $(call cmd,cc_symtypes_c)
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200145
Vinícius Tinti433db3e2017-04-24 13:04:58 -0700146# LLVM assembly
147# Generate .ll files from .c
148quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@
149 cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $<
150
151$(obj)/%.ll: $(src)/%.c FORCE
152 $(call if_changed_dep,cc_ll_c)
153
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154# C (.c) files
155# The C file is compiled and updated dependency information is generated.
156# (See cmd_cc_o_c + relevant part of rule_cc_o_c)
157
158quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
159
160ifndef CONFIG_MODVERSIONS
161cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
162
163else
164# When module versioning is enabled the following steps are executed:
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100165# o compile a .tmp_<file>.o from <file>.c
166# o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
167# not export symbols, we just rename .tmp_<file>.o to <file>.o and
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168# are done.
169# o otherwise, we calculate symbol versions using the good old
170# genksyms on the preprocessed source and postprocess them in a way
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100171# that they are usable as a linker script
172# o generate <file>.o from .tmp_<file>.o using the linker to
173# replace the unresolved symbols __crc_exported_symbol with
174# the actual value of the checksum generated by genksyms
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100176cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100177
178cmd_modversions_c = \
Don Zickuse26d6b82010-05-24 17:07:24 -0400179 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | 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 Yamadad503ac52018-08-24 08:20:39 +0900183 $(LD) $(KBUILD_LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
Don Zickuse26d6b82010-05-24 17:07:24 -0400184 -T $(@D)/.tmp_$(@F:.o=.ver); \
185 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
186 else \
187 mv -f $(@D)/.tmp_$(@F) $@; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 fi;
189endif
190
Steven Rostedt8da38212008-08-14 15:45:07 -0400191ifdef CONFIG_FTRACE_MCOUNT_RECORD
Vasily Gorbik07d04082018-08-06 15:17:44 +0200192ifndef CC_USING_RECORD_MCOUNT
193# compiler will not generate __mcount_loc use recordmcount or recordmcount.pl
Steven Rostedt72441cb2010-10-13 17:12:30 -0400194ifdef BUILD_C_RECORDMCOUNT
Steven Rostedt85356f82011-04-12 18:59:10 -0400195ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
196 RECORDMCOUNT_FLAGS = -w
197endif
Steven Rostedtd7b4d6d2010-10-18 14:42:00 -0400198# Due to recursion, we must skip empty.o.
199# The empty.o file is created in the make process in order to determine
Cao jin312a3d02017-08-02 10:31:06 +0800200# the target endianness and word size. It is made before all other C
201# files, including recordmcount.
Wu Zhangjin45677452010-10-28 00:24:34 +0800202sub_cmd_record_mcount = \
203 if [ $(@) != "scripts/mod/empty.o" ]; then \
Steven Rostedt85356f82011-04-12 18:59:10 -0400204 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
Wu Zhangjin45677452010-10-28 00:24:34 +0800205 fi;
Michal Marekd6971822011-05-17 15:36:46 +0200206recordmcount_source := $(srctree)/scripts/recordmcount.c \
207 $(srctree)/scripts/recordmcount.h
Steven Rostedt72441cb2010-10-13 17:12:30 -0400208else
Wu Zhangjin45677452010-10-28 00:24:34 +0800209sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
Wu Zhangjine6299d22009-11-20 20:34:31 +0800210 "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
Steven Rostedtb3acf292008-10-29 15:30:26 -0400211 "$(if $(CONFIG_64BIT),64,32)" \
Rabin Vincentf9810a82010-08-10 19:39:20 +0100212 "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
Masahiro Yamadad503ac52018-08-24 08:20:39 +0900213 "$(LD) $(KBUILD_LDFLAGS)" "$(NM)" "$(RM)" "$(MV)" \
Shaohua Li18c167f2009-01-12 10:00:51 +0800214 "$(if $(part-of-module),1,0)" "$(@)";
Michal Marekd6971822011-05-17 15:36:46 +0200215recordmcount_source := $(srctree)/scripts/recordmcount.pl
Cao jin312a3d02017-08-02 10:31:06 +0800216endif # BUILD_C_RECORDMCOUNT
Heiko Carstensc0a80c02015-01-09 13:06:33 +0100217cmd_record_mcount = \
218 if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" = \
219 "$(CC_FLAGS_FTRACE)" ]; then \
Wu Zhangjin45677452010-10-28 00:24:34 +0800220 $(sub_cmd_record_mcount) \
221 fi;
Vasily Gorbik07d04082018-08-06 15:17:44 +0200222endif # CC_USING_RECORD_MCOUNT
Cao jin312a3d02017-08-02 10:31:06 +0800223endif # CONFIG_FTRACE_MCOUNT_RECORD
Steven Rostedt8da38212008-08-14 15:45:07 -0400224
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600225ifdef CONFIG_STACK_VALIDATION
Josh Poimboeuf3b27a0c2016-03-03 11:39:30 -0600226ifneq ($(SKIP_STACK_VALIDATION),1)
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600227
228__objtool_obj := $(objtree)/tools/objtool/objtool
229
Josh Poimboeuf11af8472017-10-13 15:02:00 -0500230objtool_args = $(if $(CONFIG_UNWINDER_ORC),orc generate,check)
Josh Poimboeufee9f8fc2017-07-24 18:36:57 -0500231
Peter Zijlstraca41b972018-01-31 10:18:28 +0100232objtool_args += $(if $(part-of-module), --module,)
233
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600234ifndef CONFIG_FRAME_POINTER
235objtool_args += --no-fp
236endif
Josh Poimboeuf867ac9d2017-07-24 18:34:14 -0500237ifdef CONFIG_GCOV_KERNEL
238objtool_args += --no-unreachable
239endif
Peter Zijlstrab5bc2232018-01-16 10:24:06 +0100240ifdef CONFIG_RETPOLINE
Peter Zijlstrad5028ba2018-02-06 09:46:13 +0100241ifneq ($(RETPOLINE_CFLAGS),)
Peter Zijlstrab5bc2232018-01-16 10:24:06 +0100242 objtool_args += --retpoline
243endif
Peter Zijlstrad5028ba2018-02-06 09:46:13 +0100244endif
Peter Zijlstrab5bc2232018-01-16 10:24:06 +0100245
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600246
Josh Poimboeuf2a0098d2018-01-15 08:17:07 -0600247ifdef CONFIG_MODVERSIONS
248objtool_o = $(@D)/.tmp_$(@F)
249else
250objtool_o = $(@)
251endif
252
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600253# 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
254# 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file
255# 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file
256cmd_objtool = $(if $(patsubst y%,, \
257 $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
Josh Poimboeuf2a0098d2018-01-15 08:17:07 -0600258 $(__objtool_obj) $(objtool_args) "$(objtool_o)";)
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600259objtool_obj = $(if $(patsubst y%,, \
260 $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
261 $(__objtool_obj))
262
Josh Poimboeuf3b27a0c2016-03-03 11:39:30 -0600263endif # SKIP_STACK_VALIDATION
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600264endif # CONFIG_STACK_VALIDATION
265
Josh Poimboeufee9f8fc2017-07-24 18:36:57 -0500266# Rebuild all objects when objtool changes, or is enabled/disabled.
267objtool_dep = $(objtool_obj) \
268 $(wildcard include/config/orc/unwinder.h \
269 include/config/stack/validation.h)
270
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271define rule_cc_o_c
Jan Beulich6176aa92006-01-30 10:04:27 +0100272 $(call echo-cmd,checksrc) $(cmd_checksrc) \
Nicolas Pitree4aca452016-02-17 15:50:06 -0500273 $(call cmd_and_fixdep,cc_o_c) \
Matthew Wilcox3a025e12017-11-20 10:40:40 -0800274 $(cmd_checkdoc) \
Jiri Slabye8a31182017-04-21 17:16:20 +0200275 $(call echo-cmd,objtool) $(cmd_objtool) \
Josh Poimboeuf2a0098d2018-01-15 08:17:07 -0600276 $(cmd_modversions_c) \
Nicolas Pitree4aca452016-02-17 15:50:06 -0500277 $(call echo-cmd,record_mcount) $(cmd_record_mcount)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278endef
279
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600280define rule_as_o_S
Nicolas Pitree4aca452016-02-17 15:50:06 -0500281 $(call cmd_and_fixdep,as_o_S) \
Josh Poimboeuf2a0098d2018-01-15 08:17:07 -0600282 $(call echo-cmd,objtool) $(cmd_objtool) \
283 $(cmd_modversions_S)
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600284endef
285
Nicolas Pitre9895c032016-01-21 17:07:24 -0500286# List module undefined symbols (or empty line if not enabled)
287ifdef CONFIG_TRIM_UNUSED_KSYMS
Michael Forney1fe7d2b2018-02-06 22:41:17 -0800288cmd_undef_syms = $(NM) $@ | sed -n 's/^ *U //p' | xargs echo
Nicolas Pitre9895c032016-01-21 17:07:24 -0500289else
290cmd_undef_syms = echo
291endif
292
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293# Built-in and composite module parts
Josh Poimboeufee9f8fc2017-07-24 18:36:57 -0500294$(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 $(call cmd,force_checksrc)
296 $(call if_changed_rule,cc_o_c)
297
298# Single-part modules are special since we need to mark them in $(MODVERDIR)
299
Josh Poimboeufee9f8fc2017-07-24 18:36:57 -0500300$(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 $(call cmd,force_checksrc)
302 $(call if_changed_rule,cc_o_c)
Nicolas Pitre9895c032016-01-21 17:07:24 -0500303 @{ echo $(@:.o=.ko); echo $@; \
304 $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305
306quiet_cmd_cc_lst_c = MKLST $@
307 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
308 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
309 System.map $(OBJDUMP) > $@
310
Sam Ravnborg767e5812007-05-06 09:23:45 +0200311$(obj)/%.lst: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 $(call if_changed_dep,cc_lst_c)
313
314# Compile assembler sources (.S)
315# ---------------------------------------------------------------------------
316
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200317modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318
Masahiro Yamadaf5f33682018-03-19 20:26:07 +0900319$(real-obj-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
320$(real-obj-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100322# .S file exports must have their C prototypes defined in asm/asm-prototypes.h
323# or a file that it includes, in order to get versioned symbols. We build a
324# dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
325# the .S file (with trailing ';'), and run genksyms on that, to extract vers.
326#
327# This is convoluted. The .S file must first be preprocessed to run guards and
328# expand names, then the resulting exports must be constructed into plain
329# EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
330# to make the genksyms input.
331#
332# These mirror gensymtypes_c and co above, keep them in synch.
333cmd_gensymtypes_S = \
334 (echo "\#include <linux/kernel.h>" ; \
335 echo "\#include <asm/asm-prototypes.h>" ; \
336 $(CPP) $(a_flags) $< | \
Nicholas Piggincc6acc12016-11-09 15:34:05 +1100337 grep "\<___EXPORT_SYMBOL\>" | \
338 sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ) | \
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100339 $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | \
340 $(GENKSYMS) $(if $(1), -T $(2)) \
Ard Biesheuvel56067812017-02-03 09:54:05 +0000341 $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100342 $(if $(KBUILD_PRESERVE),-p) \
343 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
344
345quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@
346cmd_cc_symtypes_S = \
347 set -e; \
348 $(call cmd_gensymtypes_S,true,$@) >/dev/null; \
349 test -s $@ || rm -f $@
350
351$(obj)/%.symtypes : $(src)/%.S FORCE
352 $(call cmd,cc_symtypes_S)
353
354
Masahiro Yamadae0f41e52016-04-08 11:24:48 +0900355quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
356cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357
Sam Ravnborg767e5812007-05-06 09:23:45 +0200358$(obj)/%.s: $(src)/%.S FORCE
Masahiro Yamadae0f41e52016-04-08 11:24:48 +0900359 $(call if_changed_dep,cpp_s_S)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360
361quiet_cmd_as_o_S = AS $(quiet_modtag) $@
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100362
363ifndef CONFIG_MODVERSIONS
364cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
365
366else
367
368ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h)
369
370ifeq ($(ASM_PROTOTYPES),)
371cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
372
373else
374
375# versioning matches the C process described above, with difference that
376# we parse asm-prototypes.h C header to get function definitions.
377
378cmd_as_o_S = $(CC) $(a_flags) -c -o $(@D)/.tmp_$(@F) $<
379
380cmd_modversions_S = \
381 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
382 $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
383 > $(@D)/.tmp_$(@F:.o=.ver); \
384 \
Masahiro Yamadad503ac52018-08-24 08:20:39 +0900385 $(LD) $(KBUILD_LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100386 -T $(@D)/.tmp_$(@F:.o=.ver); \
387 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
388 else \
389 mv -f $(@D)/.tmp_$(@F) $@; \
390 fi;
391endif
392endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
Josh Poimboeufee9f8fc2017-07-24 18:36:57 -0500394$(obj)/%.o: $(src)/%.S $(objtool_dep) FORCE
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600395 $(call if_changed_rule,as_o_S)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396
Masahiro Yamadaf98fe472018-03-19 20:26:08 +0900397targets += $(filter-out $(subdir-obj-y), $(real-obj-y)) $(real-obj-m) $(lib-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398targets += $(extra-y) $(MAKECMDGOALS) $(always)
399
400# Linker scripts preprocessor (.lds.S -> .lds)
401# ---------------------------------------------------------------------------
402quiet_cmd_cpp_lds_S = LDS $@
Linus Torvalds5cb05122017-11-02 14:10:37 -0700403 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \
Tim Abbott42f29a22009-09-20 18:14:12 -0400404 -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405
Sam Ravnborg767e5812007-05-06 09:23:45 +0200406$(obj)/%.lds: $(src)/%.lds.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 $(call if_changed_dep,cpp_lds_S)
408
David Howells4520c6a2012-09-21 23:31:13 +0100409# ASN.1 grammar
410# ---------------------------------------------------------------------------
411quiet_cmd_asn1_compiler = ASN.1 $@
412 cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
413 $(subst .h,.c,$@) $(subst .c,.h,$@)
414
Masahiro Yamada4fa8bc92018-03-23 22:04:37 +0900415$(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
David Howells4520c6a2012-09-21 23:31:13 +0100416 $(call cmd,asn1_compiler)
417
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418# Build the compiled-in targets
419# ---------------------------------------------------------------------------
420
421# To build objects in subdirs, we need to descend into the directories
422$(sort $(subdir-obj-y)): $(subdir-ym) ;
423
424#
425# Rule to compile a set of .o files into one .o file
426#
427ifdef builtin-target
Stephen Rothwella5967db2016-08-24 22:29:19 +1000428
Nicholas Pigginf49821e2018-02-11 00:25:04 +1000429# built-in.a archives are made with no symbol table or index which
Nicholas Piggin6358d6e2018-02-11 00:25:03 +1000430# makes them small and fast, but unable to be used by the linker.
Nicholas Pigginf49821e2018-02-11 00:25:04 +1000431# scripts/link-vmlinux.sh builds an aggregate built-in.a with a symbol
Nicholas Piggin6358d6e2018-02-11 00:25:03 +1000432# table and index.
Masahiro Yamada5e18f022018-03-19 20:26:12 +0900433quiet_cmd_ar_builtin = AR $@
434 cmd_ar_builtin = rm -f $@; \
435 $(AR) rcSTP$(KBUILD_ARFLAGS) $@ $(filter $(real-obj-y), $^)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436
Masahiro Yamadaf98fe472018-03-19 20:26:08 +0900437$(builtin-target): $(real-obj-y) FORCE
Masahiro Yamada5e18f022018-03-19 20:26:12 +0900438 $(call if_changed,ar_builtin)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439
440targets += $(builtin-target)
441endif # builtin-target
442
443#
Tejun Heo551559e2007-12-07 21:04:30 +0900444# Rule to create modules.order file
445#
446# Create commands to either record .ko file or cat modules.order from
447# a subdirectory
448modorder-cmds = \
449 $(foreach m, $(modorder), \
450 $(if $(filter %/modules.order, $m), \
451 cat $m;, echo kernel/$m;))
452
453$(modorder-target): $(subdir-ym) FORCE
454 $(Q)(cat /dev/null; $(modorder-cmds)) > $@
455
456#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457# Rule to compile a set of .o files into one .a file
458#
459ifdef lib-target
460quiet_cmd_link_l_target = AR $@
Stephen Rothwella5967db2016-08-24 22:29:19 +1000461
Nicholas Piggin6358d6e2018-02-11 00:25:03 +1000462# lib target archives do get a symbol table and index
463cmd_link_l_target = rm -f $@; $(AR) rcsTP$(KBUILD_ARFLAGS) $@ $(lib-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464
465$(lib-target): $(lib-y) FORCE
466 $(call if_changed,link_l_target)
467
468targets += $(lib-target)
Al Viro7f2084f2016-01-15 14:01:22 -0500469
470dummy-object = $(obj)/.lib_exports.o
471ksyms-lds = $(dot-target).lds
Al Viro7f2084f2016-01-15 14:01:22 -0500472
473quiet_cmd_export_list = EXPORTS $@
474cmd_export_list = $(OBJDUMP) -h $< | \
Masahiro Yamada704db54332018-05-09 16:23:50 +0900475 sed -ne '/___ksymtab/s/.*+\([^ ]*\).*/EXTERN(\1)/p' >$(ksyms-lds);\
Al Viro7f2084f2016-01-15 14:01:22 -0500476 rm -f $(dummy-object);\
Nicholas Piggin9da2f582016-11-24 03:41:40 +1100477 echo | $(CC) $(a_flags) -c -o $(dummy-object) -x assembler -;\
Al Viro7f2084f2016-01-15 14:01:22 -0500478 $(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\
479 rm $(dummy-object) $(ksyms-lds)
480
481$(obj)/lib-ksyms.o: $(lib-target) FORCE
482 $(call if_changed,export_list)
Nicholas Piggin989cea5c2016-10-21 01:13:33 +1100483
484targets += $(obj)/lib-ksyms.o
485
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486endif
487
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488quiet_cmd_link_multi-m = LD [M] $@
Masahiro Yamada69ea9122018-10-04 13:25:19 +0900489cmd_link_multi-m = $(LD) $(ld_flags) -r -o $@ $(filter %.o,$^) $(cmd_secanalysis)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490
Masahiro Yamadac8589d12014-08-19 16:34:20 +0900491$(multi-used-m): FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 $(call if_changed,link_multi-m)
Masahiro Yamada69ea9122018-10-04 13:25:19 +0900493 @{ echo $(@:.o=.ko); echo $(filter %.o,$^); \
Nicolas Pitre9895c032016-01-21 17:07:24 -0500494 $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
Michal Marekcf4f2192015-10-27 14:02:24 +0100495$(call multi_depend, $(multi-used-m), .o, -objs -y -m)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496
Masahiro Yamadaf98fe472018-03-19 20:26:08 +0900497targets += $(multi-used-m)
Masahiro Yamada591f6682017-11-13 19:29:36 +0900498targets := $(filter-out $(PHONY), $(targets))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499
Masahiro Yamadab23d1a22018-03-23 22:04:33 +0900500# Add intermediate targets:
501# When building objects with specific suffix patterns, add intermediate
502# targets that the final targets are derived from.
503intermediate_targets = $(foreach sfx, $(2), \
504 $(patsubst %$(strip $(1)),%$(sfx), \
505 $(filter %$(strip $(1)), $(targets))))
Masahiro Yamada54a702f2018-03-23 22:04:39 +0900506# %.asn1.o <- %.asn1.[ch] <- %.asn1
Masahiro Yamadaa7f92412018-03-23 22:04:34 +0900507# %.dtb.o <- %.dtb.S <- %.dtb <- %.dts
Masahiro Yamadab23d1a22018-03-23 22:04:33 +0900508# %.lex.o <- %.lex.c <- %.l
509# %.tab.o <- %.tab.[ch] <- %.y
Masahiro Yamada54a702f2018-03-23 22:04:39 +0900510targets += $(call intermediate_targets, .asn1.o, .asn1.c .asn1.h) \
511 $(call intermediate_targets, .dtb.o, .dtb.S .dtb) \
Masahiro Yamadaa7f92412018-03-23 22:04:34 +0900512 $(call intermediate_targets, .lex.o, .lex.c) \
Masahiro Yamadab23d1a22018-03-23 22:04:33 +0900513 $(call intermediate_targets, .tab.o, .tab.c .tab.h)
514
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515# Descending
516# ---------------------------------------------------------------------------
517
Paul Smith4f193362006-03-05 17:14:10 -0500518PHONY += $(subdir-ym)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519$(subdir-ym):
Masahiro Yamadaf7adc312017-11-08 01:31:46 +0900520 $(Q)$(MAKE) $(build)=$@ need-builtin=$(if $(findstring $@,$(subdir-obj-y)),1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
522# Add FORCE to the prequisites of a target to force it to be always rebuilt.
523# ---------------------------------------------------------------------------
524
Paul Smith4f193362006-03-05 17:14:10 -0500525PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526
527FORCE:
528
529# Read all saved command lines and dependencies for the $(targets) we
530# may be building above, using $(if_changed{,_dep}). As an
531# optimization, we don't need to read them if the target does not
532# exist, we will rebuild anyway in that case.
533
Masahiro Yamada2982c952017-11-13 19:29:35 +0900534cmd_files := $(wildcard $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535
536ifneq ($(cmd_files),)
537 include $(cmd_files)
538endif
Paul Smith4f193362006-03-05 17:14:10 -0500539
Masahiro Yamada8a787562017-11-13 19:29:37 +0900540ifneq ($(KBUILD_SRC),)
541# Create directories for object files if they do not exist
542obj-dirs := $(sort $(obj) $(patsubst %/,%, $(dir $(targets))))
Masahiro Yamadac4da7ed2017-11-13 19:29:38 +0900543# If cmd_files exist, their directories apparently exist. Skip mkdir.
544exist-dirs := $(sort $(patsubst %/,%, $(dir $(cmd_files))))
545obj-dirs := $(strip $(filter-out $(exist-dirs), $(obj-dirs)))
546ifneq ($(obj-dirs),)
Masahiro Yamada8a787562017-11-13 19:29:37 +0900547$(shell mkdir -p $(obj-dirs))
548endif
Masahiro Yamadac4da7ed2017-11-13 19:29:38 +0900549endif
Masahiro Yamada8a787562017-11-13 19:29:37 +0900550
Masahiro Yamada54a702f2018-03-23 22:04:39 +0900551# Some files contained in $(targets) are intermediate artifacts.
552# We never want them to be removed automatically.
553.SECONDARY: $(targets)
554
Paul Smith4f193362006-03-05 17:14:10 -0500555.PHONY: $(PHONY)