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Linus Torvalds1da177e2005-04-16 15:20:36 -07001# ==========================================================================
2# Building
3# ==========================================================================
4
5src := $(obj)
6
Paul Smith4f193362006-03-05 17:14:10 -05007PHONY := __build
Linus Torvalds1da177e2005-04-16 15:20:36 -07008__build:
9
Sam Ravnborgd72e5ed2007-05-28 22:47:48 +020010# Init all relevant variables used in kbuild files so
11# 1) they have correct type
12# 2) they do not inherit any value from the environment
13obj-y :=
14obj-m :=
15lib-y :=
16lib-m :=
17always :=
18targets :=
19subdir-y :=
20subdir-m :=
21EXTRA_AFLAGS :=
22EXTRA_CFLAGS :=
23EXTRA_CPPFLAGS :=
24EXTRA_LDFLAGS :=
Sam Ravnborgf77bf012007-10-15 22:25:06 +020025asflags-y :=
26ccflags-y :=
27cppflags-y :=
28ldflags-y :=
Sam Ravnborgd72e5ed2007-05-28 22:47:48 +020029
Sam Ravnborg720097d2009-04-19 11:04:26 +020030subdir-asflags-y :=
31subdir-ccflags-y :=
32
Robert P. J. Day3156fd02008-02-18 04:48:20 -050033# Read auto.conf if it exists, otherwise ignore
Roman Zippelc955cca2006-06-08 22:12:39 -070034-include include/config/auto.conf
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
Sam Ravnborg20a468b2006-01-22 13:34:15 +010036include scripts/Kbuild.include
37
Robert P. J. Day3156fd02008-02-18 04:48:20 -050038# For backward compatibility check that these variables do not change
Sam Ravnborg0c53c8e2007-10-14 22:26:53 +020039save-cflags := $(CFLAGS)
40
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 $(kbuild-file)
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
Sam Ravnborg0c53c8e2007-10-14 22:26:53 +020046# If the save-* variables changed error out
47ifeq ($(KBUILD_NOPEDANTIC),)
48 ifneq ("$(save-cflags)","$(CFLAGS)")
Arnaud Lacombe49c57d22011-08-15 01:07:13 -040049 $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use ccflags-y)
Sam Ravnborg0c53c8e2007-10-14 22:26:53 +020050 endif
51endif
Borislav Petkov4a5838a2011-03-01 09:35:29 +010052
Linus Torvalds1da177e2005-04-16 15:20:36 -070053include scripts/Makefile.lib
54
55ifdef host-progs
56ifneq ($(hostprogs-y),$(host-progs))
57$(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
58hostprogs-y += $(host-progs)
59endif
60endif
61
Robert P. J. Day3156fd02008-02-18 04:48:20 -050062# Do not include host rules unless needed
Emese Revfy24403872016-05-24 00:08:25 +020063ifneq ($(hostprogs-y)$(hostprogs-m)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-m),)
Linus Torvalds1da177e2005-04-16 15:20:36 -070064include scripts/Makefile.host
65endif
66
Puja Gupta7900b192017-02-10 14:52:32 -080067# Do not include host rules unless needed
68ifneq ($(dtbo-y),)
69include scripts/Makefile.dtbo
70endif
71
Linus Torvalds1da177e2005-04-16 15:20:36 -070072ifneq ($(KBUILD_SRC),)
73# Create output directory if not already present
74_dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
75
76# Create directories for object files if directory does not exist
77# Needed when obj-y := dir/file.o syntax is used
78_dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
79endif
80
Linus Torvalds1da177e2005-04-16 15:20:36 -070081ifndef obj
82$(warning kbuild: Makefile.build is included improperly)
83endif
84
85# ===========================================================================
86
Masahiro Yamadaa4954fd2014-09-09 19:26:21 +090087ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
Linus Torvalds1da177e2005-04-16 15:20:36 -070088lib-target := $(obj)/lib.a
Al Viro7f2084f2016-01-15 14:01:22 -050089obj-y += $(obj)/lib-ksyms.o
Linus Torvalds1da177e2005-04-16 15:20:36 -070090endif
91
Masahiro Yamadaa4954fd2014-09-09 19:26:21 +090092ifneq ($(strip $(obj-y) $(obj-m) $(obj-) $(subdir-m) $(lib-target)),)
Linus Torvalds1da177e2005-04-16 15:20:36 -070093builtin-target := $(obj)/built-in.o
94endif
95
Tejun Heo551559e2007-12-07 21:04:30 +090096modorder-target := $(obj)/modules.order
97
Linus Torvalds1da177e2005-04-16 15:20:36 -070098# We keep a list of all modules in $(MODVERDIR)
99
100__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
Tejun Heo551559e2007-12-07 21:04:30 +0900101 $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 $(subdir-ym) $(always)
103 @:
104
105# Linus' kernel sanity checking tool
106ifneq ($(KBUILD_CHECKSRC),0)
107 ifeq ($(KBUILD_CHECKSRC),2)
108 quiet_cmd_force_checksrc = CHECK $<
109 cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
110 else
111 quiet_cmd_checksrc = CHECK $<
112 cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
113 endif
114endif
115
Sam Ravnborg91341d42008-01-21 21:31:44 +0100116# Do section mismatch analysis for each module/built-in.o
117ifdef CONFIG_DEBUG_SECTION_MISMATCH
118 cmd_secanalysis = ; scripts/mod/modpost $@
119endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
121# Compile C sources (.c)
122# ---------------------------------------------------------------------------
123
124# Default is built-in, unless we know otherwise
Sam Ravnborg65881692010-07-28 17:33:09 +0200125modkern_cflags = \
126 $(if $(part-of-module), \
127 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200128 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129quiet_modtag := $(empty) $(empty)
130
Shaohua Li18c167f2009-01-12 10:00:51 +0800131$(real-objs-m) : part-of-module := y
132$(real-objs-m:.o=.i) : part-of-module := y
133$(real-objs-m:.o=.s) : part-of-module := y
134$(real-objs-m:.o=.lst): part-of-module := y
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
136$(real-objs-m) : quiet_modtag := [M]
137$(real-objs-m:.o=.i) : quiet_modtag := [M]
138$(real-objs-m:.o=.s) : quiet_modtag := [M]
139$(real-objs-m:.o=.lst): quiet_modtag := [M]
140
141$(obj-m) : quiet_modtag := [M]
142
143# Default for not multi-part modules
Sam Ravnborg5e8d7802006-07-01 09:58:02 +0200144modname = $(basetarget)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145
146$(multi-objs-m) : modname = $(modname-multi)
147$(multi-objs-m:.o=.i) : modname = $(modname-multi)
148$(multi-objs-m:.o=.s) : modname = $(modname-multi)
149$(multi-objs-m:.o=.lst) : modname = $(modname-multi)
150$(multi-objs-y) : modname = $(modname-multi)
151$(multi-objs-y:.o=.i) : modname = $(modname-multi)
152$(multi-objs-y:.o=.s) : modname = $(modname-multi)
153$(multi-objs-y:.o=.lst) : modname = $(modname-multi)
154
155quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
Andi Kleen1e64ff42014-02-08 09:01:15 +0100156cmd_cc_s_c = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157
Sam Ravnborg767e5812007-05-06 09:23:45 +0200158$(obj)/%.s: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 $(call if_changed_dep,cc_s_c)
160
Masahiro Yamada23d43842016-04-08 11:24:47 +0900161quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@
162cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163
Sam Ravnborg767e5812007-05-06 09:23:45 +0200164$(obj)/%.i: $(src)/%.c FORCE
Masahiro Yamada23d43842016-04-08 11:24:47 +0900165 $(call if_changed_dep,cpp_i_c)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100167# These mirror gensymtypes_S and co below, keep them in synch.
168cmd_gensymtypes_c = \
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100169 $(CPP) -D__GENKSYMS__ $(c_flags) $< | \
James Hogand70f82a2013-03-18 19:38:56 +1030170 $(GENKSYMS) $(if $(1), -T $(2)) \
171 $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100172 $(if $(KBUILD_PRESERVE),-p) \
Don Zickuse26d6b82010-05-24 17:07:24 -0400173 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100174
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200175quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100176cmd_cc_symtypes_c = \
177 set -e; \
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100178 $(call cmd_gensymtypes_c,true,$@) >/dev/null; \
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100179 test -s $@ || rm -f $@
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200180
Sam Ravnborg767e5812007-05-06 09:23:45 +0200181$(obj)/%.symtypes : $(src)/%.c FORCE
Andreas Gruenbacher64e6c1e2008-12-01 14:21:01 -0800182 $(call cmd,cc_symtypes_c)
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200183
Vinícius Tinti30c02b62017-04-24 13:04:58 -0700184# LLVM assembly
185# Generate .ll files from .c
186quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@
187 cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $<
188
189$(obj)/%.ll: $(src)/%.c FORCE
190 $(call if_changed_dep,cc_ll_c)
191
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192# C (.c) files
193# The C file is compiled and updated dependency information is generated.
194# (See cmd_cc_o_c + relevant part of rule_cc_o_c)
195
196quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
197
198ifndef CONFIG_MODVERSIONS
199cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
200
201else
202# When module versioning is enabled the following steps are executed:
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100203# o compile a .tmp_<file>.o from <file>.c
204# o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
205# not export symbols, we just rename .tmp_<file>.o to <file>.o and
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206# are done.
207# o otherwise, we calculate symbol versions using the good old
208# genksyms on the preprocessed source and postprocess them in a way
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100209# that they are usable as a linker script
210# o generate <file>.o from .tmp_<file>.o using the linker to
211# replace the unresolved symbols __crc_exported_symbol with
212# the actual value of the checksum generated by genksyms
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100214cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100215
Sami Tolvanen475bdd72017-11-28 08:48:49 -0800216ifdef CONFIG_LTO_CLANG
217# Generate .o.symversions files for each .o with exported symbols, and link these
218# to the kernel and/or modules at the end.
219cmd_modversions_c = \
220 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) >/dev/null 2>/dev/null; then \
221 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
222 $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
223 > $(@D)/$(@F).symversions; \
224 fi; \
225 else \
226 if $(LLVM_DIS) -o=- $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
227 $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
228 > $(@D)/$(@F).symversions; \
229 fi; \
230 fi; \
231 mv -f $(@D)/.tmp_$(@F) $@;
232else
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100233cmd_modversions_c = \
Don Zickuse26d6b82010-05-24 17:07:24 -0400234 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100235 $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
Don Zickuse26d6b82010-05-24 17:07:24 -0400236 > $(@D)/.tmp_$(@F:.o=.ver); \
237 \
238 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
239 -T $(@D)/.tmp_$(@F:.o=.ver); \
240 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
241 else \
242 mv -f $(@D)/.tmp_$(@F) $@; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 fi;
244endif
Sami Tolvanen475bdd72017-11-28 08:48:49 -0800245endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246
Steven Rostedt8da38212008-08-14 15:45:07 -0400247ifdef CONFIG_FTRACE_MCOUNT_RECORD
Vasily Gorbik3f50dfb2018-08-06 15:17:44 +0200248ifndef CC_USING_RECORD_MCOUNT
249# compiler will not generate __mcount_loc use recordmcount or recordmcount.pl
Steven Rostedt72441cb2010-10-13 17:12:30 -0400250ifdef BUILD_C_RECORDMCOUNT
Steven Rostedt85356f82011-04-12 18:59:10 -0400251ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
252 RECORDMCOUNT_FLAGS = -w
253endif
Sami Tolvanen7bd125e2017-06-16 12:52:57 -0700254
255ifdef CONFIG_LTO_CLANG
256# With LTO, we postpone running recordmcount until after the LTO link step, so
257# let's export the parameters for the link script.
258export RECORDMCOUNT_FLAGS
259else
Steven Rostedtd7b4d6d2010-10-18 14:42:00 -0400260# Due to recursion, we must skip empty.o.
261# The empty.o file is created in the make process in order to determine
262# the target endianness and word size. It is made before all other C
263# files, including recordmcount.
Wu Zhangjin45677452010-10-28 00:24:34 +0800264sub_cmd_record_mcount = \
265 if [ $(@) != "scripts/mod/empty.o" ]; then \
Steven Rostedt85356f82011-04-12 18:59:10 -0400266 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
Wu Zhangjin45677452010-10-28 00:24:34 +0800267 fi;
Sami Tolvanen7bd125e2017-06-16 12:52:57 -0700268endif
269
Michal Marekd6971822011-05-17 15:36:46 +0200270recordmcount_source := $(srctree)/scripts/recordmcount.c \
271 $(srctree)/scripts/recordmcount.h
Sami Tolvanen7bd125e2017-06-16 12:52:57 -0700272else # !BUILD_C_RECORDMCOUNT
Wu Zhangjin45677452010-10-28 00:24:34 +0800273sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
Wu Zhangjine6299d22009-11-20 20:34:31 +0800274 "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
Steven Rostedtb3acf292008-10-29 15:30:26 -0400275 "$(if $(CONFIG_64BIT),64,32)" \
Rabin Vincentf9810a82010-08-10 19:39:20 +0100276 "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
277 "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
Shaohua Li18c167f2009-01-12 10:00:51 +0800278 "$(if $(part-of-module),1,0)" "$(@)";
Sami Tolvanen7bd125e2017-06-16 12:52:57 -0700279
Michal Marekd6971822011-05-17 15:36:46 +0200280recordmcount_source := $(srctree)/scripts/recordmcount.pl
Sami Tolvanen7bd125e2017-06-16 12:52:57 -0700281endif # BUILD_C_RECORDMCOUNT
282
283ifndef CONFIG_LTO_CLANG
Heiko Carstensc0a80c02015-01-09 13:06:33 +0100284cmd_record_mcount = \
285 if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" = \
286 "$(CC_FLAGS_FTRACE)" ]; then \
Wu Zhangjin45677452010-10-28 00:24:34 +0800287 $(sub_cmd_record_mcount) \
288 fi;
Vasily Gorbik3f50dfb2018-08-06 15:17:44 +0200289endif # CC_USING_RECORD_MCOUNT
Steven Rostedt72441cb2010-10-13 17:12:30 -0400290endif
Sami Tolvanen7bd125e2017-06-16 12:52:57 -0700291endif # CONFIG_FTRACE_MCOUNT_RECORD
Steven Rostedt8da38212008-08-14 15:45:07 -0400292
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600293ifdef CONFIG_STACK_VALIDATION
Josh Poimboeuf3b27a0c2016-03-03 11:39:30 -0600294ifneq ($(SKIP_STACK_VALIDATION),1)
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600295
296__objtool_obj := $(objtree)/tools/objtool/objtool
297
298objtool_args = check
299ifndef CONFIG_FRAME_POINTER
300objtool_args += --no-fp
301endif
Josh Poimboeuf23873ae2017-07-24 18:34:14 -0500302ifdef CONFIG_GCOV_KERNEL
303objtool_args += --no-unreachable
304endif
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600305
306# 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
307# 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file
308# 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file
309cmd_objtool = $(if $(patsubst y%,, \
310 $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
311 $(__objtool_obj) $(objtool_args) "$(@)";)
312objtool_obj = $(if $(patsubst y%,, \
313 $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
314 $(__objtool_obj))
315
Josh Poimboeuf3b27a0c2016-03-03 11:39:30 -0600316endif # SKIP_STACK_VALIDATION
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600317endif # CONFIG_STACK_VALIDATION
318
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319define rule_cc_o_c
Jan Beulich6176aa92006-01-30 10:04:27 +0100320 $(call echo-cmd,checksrc) $(cmd_checksrc) \
Nicolas Pitree4aca452016-02-17 15:50:06 -0500321 $(call cmd_and_fixdep,cc_o_c) \
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100322 $(cmd_modversions_c) \
Nicolas Pitree4aca452016-02-17 15:50:06 -0500323 $(cmd_objtool) \
324 $(call echo-cmd,record_mcount) $(cmd_record_mcount)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325endef
326
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600327define rule_as_o_S
Nicolas Pitree4aca452016-02-17 15:50:06 -0500328 $(call cmd_and_fixdep,as_o_S) \
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100329 $(cmd_modversions_S) \
Nicolas Pitree4aca452016-02-17 15:50:06 -0500330 $(cmd_objtool)
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600331endef
332
Nicolas Pitre9895c032016-01-21 17:07:24 -0500333# List module undefined symbols (or empty line if not enabled)
334ifdef CONFIG_TRIM_UNUSED_KSYMS
335cmd_undef_syms = $(NM) $@ | sed -n 's/^ \+U //p' | xargs echo
336else
337cmd_undef_syms = echo
338endif
339
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340# Built-in and composite module parts
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600341$(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_obj) FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 $(call cmd,force_checksrc)
343 $(call if_changed_rule,cc_o_c)
344
345# Single-part modules are special since we need to mark them in $(MODVERDIR)
346
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600347$(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_obj) FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 $(call cmd,force_checksrc)
349 $(call if_changed_rule,cc_o_c)
Nicolas Pitre9895c032016-01-21 17:07:24 -0500350 @{ echo $(@:.o=.ko); echo $@; \
351 $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352
353quiet_cmd_cc_lst_c = MKLST $@
354 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
355 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
356 System.map $(OBJDUMP) > $@
357
Sam Ravnborg767e5812007-05-06 09:23:45 +0200358$(obj)/%.lst: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 $(call if_changed_dep,cc_lst_c)
360
361# Compile assembler sources (.S)
362# ---------------------------------------------------------------------------
363
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200364modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
Sam Ravnborg65881692010-07-28 17:33:09 +0200366$(real-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
367$(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100369# .S file exports must have their C prototypes defined in asm/asm-prototypes.h
370# or a file that it includes, in order to get versioned symbols. We build a
371# dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
372# the .S file (with trailing ';'), and run genksyms on that, to extract vers.
373#
374# This is convoluted. The .S file must first be preprocessed to run guards and
375# expand names, then the resulting exports must be constructed into plain
376# EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
377# to make the genksyms input.
378#
379# These mirror gensymtypes_c and co above, keep them in synch.
380cmd_gensymtypes_S = \
381 (echo "\#include <linux/kernel.h>" ; \
382 echo "\#include <asm/asm-prototypes.h>" ; \
383 $(CPP) $(a_flags) $< | \
Nicholas Piggincc6acc12016-11-09 15:34:05 +1100384 grep "\<___EXPORT_SYMBOL\>" | \
385 sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ) | \
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100386 $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | \
387 $(GENKSYMS) $(if $(1), -T $(2)) \
388 $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \
389 $(if $(KBUILD_PRESERVE),-p) \
390 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
391
392quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@
393cmd_cc_symtypes_S = \
394 set -e; \
395 $(call cmd_gensymtypes_S,true,$@) >/dev/null; \
396 test -s $@ || rm -f $@
397
398$(obj)/%.symtypes : $(src)/%.S FORCE
399 $(call cmd,cc_symtypes_S)
400
401
Masahiro Yamadae0f41e52016-04-08 11:24:48 +0900402quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
403cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404
Sam Ravnborg767e5812007-05-06 09:23:45 +0200405$(obj)/%.s: $(src)/%.S FORCE
Masahiro Yamadae0f41e52016-04-08 11:24:48 +0900406 $(call if_changed_dep,cpp_s_S)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407
408quiet_cmd_as_o_S = AS $(quiet_modtag) $@
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100409
410ifndef CONFIG_MODVERSIONS
411cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
412
413else
414
415ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h)
416
417ifeq ($(ASM_PROTOTYPES),)
418cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
419
420else
421
422# versioning matches the C process described above, with difference that
423# we parse asm-prototypes.h C header to get function definitions.
424
425cmd_as_o_S = $(CC) $(a_flags) -c -o $(@D)/.tmp_$(@F) $<
426
427cmd_modversions_S = \
428 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
429 $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
430 > $(@D)/.tmp_$(@F:.o=.ver); \
431 \
432 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
433 -T $(@D)/.tmp_$(@F:.o=.ver); \
434 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
435 else \
436 mv -f $(@D)/.tmp_$(@F) $@; \
437 fi;
438endif
439endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600441$(obj)/%.o: $(src)/%.S $(objtool_obj) FORCE
442 $(call if_changed_rule,as_o_S)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443
444targets += $(real-objs-y) $(real-objs-m) $(lib-y)
445targets += $(extra-y) $(MAKECMDGOALS) $(always)
446
447# Linker scripts preprocessor (.lds.S -> .lds)
448# ---------------------------------------------------------------------------
449quiet_cmd_cpp_lds_S = LDS $@
Sam Ravnborg51b563f2009-09-20 12:28:22 +0200450 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
Tim Abbott42f29a22009-09-20 18:14:12 -0400451 -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452
Sam Ravnborg767e5812007-05-06 09:23:45 +0200453$(obj)/%.lds: $(src)/%.lds.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 $(call if_changed_dep,cpp_lds_S)
455
David Howells4520c6a2012-09-21 23:31:13 +0100456# ASN.1 grammar
457# ---------------------------------------------------------------------------
458quiet_cmd_asn1_compiler = ASN.1 $@
459 cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
460 $(subst .h,.c,$@) $(subst .c,.h,$@)
461
462.PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h
463
464$(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
465 $(call cmd,asn1_compiler)
466
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467# Build the compiled-in targets
468# ---------------------------------------------------------------------------
469
470# To build objects in subdirs, we need to descend into the directories
471$(sort $(subdir-obj-y)): $(subdir-ym) ;
472
473#
474# Rule to compile a set of .o files into one .o file
475#
476ifdef builtin-target
Stephen Rothwella5967db2016-08-24 22:29:19 +1000477
Sami Tolvanen475bdd72017-11-28 08:48:49 -0800478ifdef CONFIG_LTO_CLANG
479 ifdef CONFIG_MODVERSIONS
480 # combine symversions for later processing
481 update_lto_symversions = \
482 rm -f $@.symversions; \
483 for i in $(filter-out FORCE,$^); do \
484 if [ -f $$i.symversions ]; then \
485 cat $$i.symversions \
486 >> $@.symversions; \
487 fi; \
488 done;
489 endif
490 # rebuild the symbol table with llvm-ar to include IR files
491 update_lto_symtable = ; \
492 mv -f $@ $@.tmp; \
493 $(LLVM_AR) rcsT$(KBUILD_ARFLAGS) $@ \
494 $$($(AR) t $@.tmp); \
495 rm -f $@.tmp
496endif
497
Stephen Rothwella5967db2016-08-24 22:29:19 +1000498ifdef CONFIG_THIN_ARCHIVES
Sami Tolvanen475bdd72017-11-28 08:48:49 -0800499 cmd_make_builtin = $(update_lto_symversions) \
500 rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS)
501 cmd_make_empty_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS)
Stephen Rothwella5967db2016-08-24 22:29:19 +1000502 quiet_cmd_link_o_target = AR $@
503else
504 cmd_make_builtin = $(LD) $(ld_flags) -r -o
505 cmd_make_empty_builtin = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS)
506 quiet_cmd_link_o_target = LD $@
507endif
508
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509# If the list of objects to link is empty, just create an empty built-in.o
510cmd_link_o_target = $(if $(strip $(obj-y)),\
Stephen Rothwella5967db2016-08-24 22:29:19 +1000511 $(cmd_make_builtin) $@ $(filter $(obj-y), $^) \
Sam Ravnborg91341d42008-01-21 21:31:44 +0100512 $(cmd_secanalysis),\
Stephen Rothwella5967db2016-08-24 22:29:19 +1000513 $(cmd_make_empty_builtin) $@)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514
515$(builtin-target): $(obj-y) FORCE
516 $(call if_changed,link_o_target)
517
518targets += $(builtin-target)
519endif # builtin-target
520
521#
Tejun Heo551559e2007-12-07 21:04:30 +0900522# Rule to create modules.order file
523#
524# Create commands to either record .ko file or cat modules.order from
525# a subdirectory
526modorder-cmds = \
527 $(foreach m, $(modorder), \
528 $(if $(filter %/modules.order, $m), \
529 cat $m;, echo kernel/$m;))
530
531$(modorder-target): $(subdir-ym) FORCE
532 $(Q)(cat /dev/null; $(modorder-cmds)) > $@
533
534#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535# Rule to compile a set of .o files into one .a file
536#
537ifdef lib-target
538quiet_cmd_link_l_target = AR $@
Stephen Rothwella5967db2016-08-24 22:29:19 +1000539
540ifdef CONFIG_THIN_ARCHIVES
Sami Tolvanen475bdd72017-11-28 08:48:49 -0800541 cmd_link_l_target = \
542 $(update_lto_symversions) \
543 rm -f $@; \
544 $(AR) rcsTP$(KBUILD_ARFLAGS) $@ $(lib-y) \
545 $(update_lto_symtable)
Stephen Rothwella5967db2016-08-24 22:29:19 +1000546else
547 cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
548endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549
550$(lib-target): $(lib-y) FORCE
551 $(call if_changed,link_l_target)
552
553targets += $(lib-target)
Al Viro7f2084f2016-01-15 14:01:22 -0500554
555dummy-object = $(obj)/.lib_exports.o
556ksyms-lds = $(dot-target).lds
557ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
558ref_prefix = EXTERN(_
559else
560ref_prefix = EXTERN(
561endif
562
Sami Tolvanen475bdd72017-11-28 08:48:49 -0800563filter_export_list = sed -ne '/___ksymtab/s/.*+\([^ "]*\).*/$(ref_prefix)\1)/p'
564link_export_list = rm -f $(dummy-object);\
565 echo | $(CC) $(a_flags) -c -o $(dummy-object) -x assembler -;\
Al Viro7f2084f2016-01-15 14:01:22 -0500566 $(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\
567 rm $(dummy-object) $(ksyms-lds)
568
Sami Tolvanen475bdd72017-11-28 08:48:49 -0800569quiet_cmd_export_list = EXPORTS $@
570
571ifdef CONFIG_LTO_CLANG
572# objdump doesn't understand IR files and llvm-dis doesn't support archives,
573# so we'll walk through each file in the archive separately
574cmd_export_list = \
575 rm -f $(ksyms-lds); \
576 for o in $$($(AR) t $<); do \
577 if $(OBJDUMP) -h $$o >/dev/null 2>/dev/null; then \
578 $(OBJDUMP) -h $$o | \
579 $(filter_export_list) \
580 >>$(ksyms-lds); \
581 else \
582 $(LLVM_DIS) -o=- $$o | \
583 $(filter_export_list) \
584 >>$(ksyms-lds); \
585 fi; \
586 done; \
587 $(link_export_list)
588else
589cmd_export_list = $(OBJDUMP) -h $< | $(filter_export_list) >$(ksyms-lds); \
590 $(link_export_list)
591endif
592
Al Viro7f2084f2016-01-15 14:01:22 -0500593$(obj)/lib-ksyms.o: $(lib-target) FORCE
594 $(call if_changed,export_list)
Nicholas Piggin989cea5c2016-10-21 01:13:33 +1100595
596targets += $(obj)/lib-ksyms.o
597
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598endif
599
600#
601# Rule to link composite objects
602#
603# Composite objects are specified in kbuild makefile as follows:
604# <composite-object>-objs := <list of .o files>
605# or
606# <composite-object>-y := <list of .o files>
Michal Marekcf4f2192015-10-27 14:02:24 +0100607# or
608# <composite-object>-m := <list of .o files>
609# The -m syntax only works if <composite object> is a module
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610link_multi_deps = \
611$(filter $(addprefix $(obj)/, \
612$($(subst $(obj)/,,$(@:.o=-objs))) \
Michal Marekcf4f2192015-10-27 14:02:24 +0100613$($(subst $(obj)/,,$(@:.o=-y))) \
614$($(subst $(obj)/,,$(@:.o=-m)))), $^)
Masahiro Yamada38385f82014-04-28 16:26:18 +0900615
Sami Tolvanen475bdd72017-11-28 08:48:49 -0800616cmd_link_multi-link = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
617
618ifdef CONFIG_THIN_ARCHIVES
619 quiet_cmd_link_multi-y = AR $@
620 cmd_link_multi-y = $(update_lto_symversions) \
621 rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) $@ $(link_multi_deps) \
622 $(update_lto_symtable)
623else
624 quiet_cmd_link_multi-y = LD $@
625 cmd_link_multi-y = $(cmd_link_multi-link)
626endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627
628quiet_cmd_link_multi-m = LD [M] $@
Sami Tolvanen475bdd72017-11-28 08:48:49 -0800629
630ifdef CONFIG_LTO_CLANG
631 # don't compile IR until needed
632 cmd_link_multi-m = $(cmd_link_multi-y)
633else
634 cmd_link_multi-m = $(cmd_link_multi-link)
635endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636
Masahiro Yamadac8589d12014-08-19 16:34:20 +0900637$(multi-used-y): FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 $(call if_changed,link_multi-y)
639
Masahiro Yamadac8589d12014-08-19 16:34:20 +0900640$(multi-used-m): FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 $(call if_changed,link_multi-m)
Nicolas Pitre9895c032016-01-21 17:07:24 -0500642 @{ echo $(@:.o=.ko); echo $(link_multi_deps); \
643 $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
Sami Tolvanen475bdd72017-11-28 08:48:49 -0800644
645$(call multi_depend, $(multi-used-y), .o, -objs -y)
Michal Marekcf4f2192015-10-27 14:02:24 +0100646$(call multi_depend, $(multi-used-m), .o, -objs -y -m)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647
648targets += $(multi-used-y) $(multi-used-m)
649
650
651# Descending
652# ---------------------------------------------------------------------------
653
Paul Smith4f193362006-03-05 17:14:10 -0500654PHONY += $(subdir-ym)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655$(subdir-ym):
656 $(Q)$(MAKE) $(build)=$@
657
658# Add FORCE to the prequisites of a target to force it to be always rebuilt.
659# ---------------------------------------------------------------------------
660
Paul Smith4f193362006-03-05 17:14:10 -0500661PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662
663FORCE:
664
665# Read all saved command lines and dependencies for the $(targets) we
666# may be building above, using $(if_changed{,_dep}). As an
667# optimization, we don't need to read them if the target does not
668# exist, we will rebuild anyway in that case.
669
670targets := $(wildcard $(sort $(targets)))
671cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
672
673ifneq ($(cmd_files),)
674 include $(cmd_files)
675endif
Paul Smith4f193362006-03-05 17:14:10 -0500676
Paul Smith4f193362006-03-05 17:14:10 -0500677# Declare the contents of the .PHONY variable as phony. We keep that
678# information in a variable se we can use it in if_changed and friends.
679
680.PHONY: $(PHONY)