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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)$(hostcxxlibs-m),)
Linus Torvalds1da177e2005-04-16 15:20:36 -070064include scripts/Makefile.host
65endif
66
67ifneq ($(KBUILD_SRC),)
68# Create output directory if not already present
69_dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
70
71# Create directories for object files if directory does not exist
72# Needed when obj-y := dir/file.o syntax is used
73_dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
74endif
75
Linus Torvalds1da177e2005-04-16 15:20:36 -070076ifndef obj
77$(warning kbuild: Makefile.build is included improperly)
78endif
79
80# ===========================================================================
81
Masahiro Yamadaa4954fd2014-09-09 19:26:21 +090082ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
Linus Torvalds1da177e2005-04-16 15:20:36 -070083lib-target := $(obj)/lib.a
Al Viro7f2084f2016-01-15 14:01:22 -050084obj-y += $(obj)/lib-ksyms.o
Linus Torvalds1da177e2005-04-16 15:20:36 -070085endif
86
Masahiro Yamadaa4954fd2014-09-09 19:26:21 +090087ifneq ($(strip $(obj-y) $(obj-m) $(obj-) $(subdir-m) $(lib-target)),)
Linus Torvalds1da177e2005-04-16 15:20:36 -070088builtin-target := $(obj)/built-in.o
89endif
90
Tejun Heo551559e2007-12-07 21:04:30 +090091modorder-target := $(obj)/modules.order
92
Linus Torvalds1da177e2005-04-16 15:20:36 -070093# We keep a list of all modules in $(MODVERDIR)
94
95__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
Tejun Heo551559e2007-12-07 21:04:30 +090096 $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 $(subdir-ym) $(always)
98 @:
99
100# Linus' kernel sanity checking tool
101ifneq ($(KBUILD_CHECKSRC),0)
102 ifeq ($(KBUILD_CHECKSRC),2)
103 quiet_cmd_force_checksrc = CHECK $<
104 cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
105 else
106 quiet_cmd_checksrc = CHECK $<
107 cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
108 endif
109endif
110
Sam Ravnborg91341d42008-01-21 21:31:44 +0100111# Do section mismatch analysis for each module/built-in.o
112ifdef CONFIG_DEBUG_SECTION_MISMATCH
113 cmd_secanalysis = ; scripts/mod/modpost $@
114endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115
116# Compile C sources (.c)
117# ---------------------------------------------------------------------------
118
119# Default is built-in, unless we know otherwise
Sam Ravnborg65881692010-07-28 17:33:09 +0200120modkern_cflags = \
121 $(if $(part-of-module), \
122 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200123 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124quiet_modtag := $(empty) $(empty)
125
Shaohua Li18c167f2009-01-12 10:00:51 +0800126$(real-objs-m) : part-of-module := y
127$(real-objs-m:.o=.i) : part-of-module := y
128$(real-objs-m:.o=.s) : part-of-module := y
129$(real-objs-m:.o=.lst): part-of-module := y
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
131$(real-objs-m) : quiet_modtag := [M]
132$(real-objs-m:.o=.i) : quiet_modtag := [M]
133$(real-objs-m:.o=.s) : quiet_modtag := [M]
134$(real-objs-m:.o=.lst): quiet_modtag := [M]
135
136$(obj-m) : quiet_modtag := [M]
137
138# Default for not multi-part modules
Sam Ravnborg5e8d7802006-07-01 09:58:02 +0200139modname = $(basetarget)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
141$(multi-objs-m) : modname = $(modname-multi)
142$(multi-objs-m:.o=.i) : modname = $(modname-multi)
143$(multi-objs-m:.o=.s) : modname = $(modname-multi)
144$(multi-objs-m:.o=.lst) : modname = $(modname-multi)
145$(multi-objs-y) : modname = $(modname-multi)
146$(multi-objs-y:.o=.i) : modname = $(modname-multi)
147$(multi-objs-y:.o=.s) : modname = $(modname-multi)
148$(multi-objs-y:.o=.lst) : modname = $(modname-multi)
149
150quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
Andi Kleen1e64ff42014-02-08 09:01:15 +0100151cmd_cc_s_c = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
Sam Ravnborg767e5812007-05-06 09:23:45 +0200153$(obj)/%.s: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 $(call if_changed_dep,cc_s_c)
155
Masahiro Yamada23d43842016-04-08 11:24:47 +0900156quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@
157cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
Sam Ravnborg767e5812007-05-06 09:23:45 +0200159$(obj)/%.i: $(src)/%.c FORCE
Masahiro Yamada23d43842016-04-08 11:24:47 +0900160 $(call if_changed_dep,cpp_i_c)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100162# These mirror gensymtypes_S and co below, keep them in synch.
163cmd_gensymtypes_c = \
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100164 $(CPP) -D__GENKSYMS__ $(c_flags) $< | \
James Hogand70f82a2013-03-18 19:38:56 +1030165 $(GENKSYMS) $(if $(1), -T $(2)) \
166 $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100167 $(if $(KBUILD_PRESERVE),-p) \
Don Zickuse26d6b82010-05-24 17:07:24 -0400168 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100169
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200170quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100171cmd_cc_symtypes_c = \
172 set -e; \
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100173 $(call cmd_gensymtypes_c,true,$@) >/dev/null; \
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100174 test -s $@ || rm -f $@
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200175
Sam Ravnborg767e5812007-05-06 09:23:45 +0200176$(obj)/%.symtypes : $(src)/%.c FORCE
Andreas Gruenbacher64e6c1e2008-12-01 14:21:01 -0800177 $(call cmd,cc_symtypes_c)
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200178
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179# C (.c) files
180# The C file is compiled and updated dependency information is generated.
181# (See cmd_cc_o_c + relevant part of rule_cc_o_c)
182
183quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
184
185ifndef CONFIG_MODVERSIONS
186cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
187
188else
189# When module versioning is enabled the following steps are executed:
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100190# o compile a .tmp_<file>.o from <file>.c
191# o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
192# not export symbols, we just rename .tmp_<file>.o to <file>.o and
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193# are done.
194# o otherwise, we calculate symbol versions using the good old
195# genksyms on the preprocessed source and postprocess them in a way
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100196# that they are usable as a linker script
197# o generate <file>.o from .tmp_<file>.o using the linker to
198# replace the unresolved symbols __crc_exported_symbol with
199# the actual value of the checksum generated by genksyms
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100201cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100202
203cmd_modversions_c = \
Don Zickuse26d6b82010-05-24 17:07:24 -0400204 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100205 $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
Don Zickuse26d6b82010-05-24 17:07:24 -0400206 > $(@D)/.tmp_$(@F:.o=.ver); \
207 \
208 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
209 -T $(@D)/.tmp_$(@F:.o=.ver); \
210 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
211 else \
212 mv -f $(@D)/.tmp_$(@F) $@; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 fi;
214endif
215
Steven Rostedt8da38212008-08-14 15:45:07 -0400216ifdef CONFIG_FTRACE_MCOUNT_RECORD
Steven Rostedt72441cb2010-10-13 17:12:30 -0400217ifdef BUILD_C_RECORDMCOUNT
Steven Rostedt85356f82011-04-12 18:59:10 -0400218ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
219 RECORDMCOUNT_FLAGS = -w
220endif
Steven Rostedtd7b4d6d2010-10-18 14:42:00 -0400221# Due to recursion, we must skip empty.o.
222# The empty.o file is created in the make process in order to determine
223# the target endianness and word size. It is made before all other C
224# files, including recordmcount.
Wu Zhangjin45677452010-10-28 00:24:34 +0800225sub_cmd_record_mcount = \
226 if [ $(@) != "scripts/mod/empty.o" ]; then \
Steven Rostedt85356f82011-04-12 18:59:10 -0400227 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
Wu Zhangjin45677452010-10-28 00:24:34 +0800228 fi;
Michal Marekd6971822011-05-17 15:36:46 +0200229recordmcount_source := $(srctree)/scripts/recordmcount.c \
230 $(srctree)/scripts/recordmcount.h
Steven Rostedt72441cb2010-10-13 17:12:30 -0400231else
Wu Zhangjin45677452010-10-28 00:24:34 +0800232sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
Wu Zhangjine6299d22009-11-20 20:34:31 +0800233 "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
Steven Rostedtb3acf292008-10-29 15:30:26 -0400234 "$(if $(CONFIG_64BIT),64,32)" \
Rabin Vincentf9810a82010-08-10 19:39:20 +0100235 "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
236 "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
Shaohua Li18c167f2009-01-12 10:00:51 +0800237 "$(if $(part-of-module),1,0)" "$(@)";
Michal Marekd6971822011-05-17 15:36:46 +0200238recordmcount_source := $(srctree)/scripts/recordmcount.pl
Steven Rostedt8da38212008-08-14 15:45:07 -0400239endif
Heiko Carstensc0a80c02015-01-09 13:06:33 +0100240cmd_record_mcount = \
241 if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" = \
242 "$(CC_FLAGS_FTRACE)" ]; then \
Wu Zhangjin45677452010-10-28 00:24:34 +0800243 $(sub_cmd_record_mcount) \
244 fi;
Steven Rostedt72441cb2010-10-13 17:12:30 -0400245endif
Steven Rostedt8da38212008-08-14 15:45:07 -0400246
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600247ifdef CONFIG_STACK_VALIDATION
Josh Poimboeuf3b27a0c2016-03-03 11:39:30 -0600248ifneq ($(SKIP_STACK_VALIDATION),1)
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600249
250__objtool_obj := $(objtree)/tools/objtool/objtool
251
252objtool_args = check
253ifndef CONFIG_FRAME_POINTER
254objtool_args += --no-fp
255endif
Josh Poimboeuf23873ae2017-07-24 18:34:14 -0500256ifdef CONFIG_GCOV_KERNEL
257objtool_args += --no-unreachable
258endif
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600259
260# 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
261# 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file
262# 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file
263cmd_objtool = $(if $(patsubst y%,, \
264 $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
265 $(__objtool_obj) $(objtool_args) "$(@)";)
266objtool_obj = $(if $(patsubst y%,, \
267 $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
268 $(__objtool_obj))
269
Josh Poimboeuf3b27a0c2016-03-03 11:39:30 -0600270endif # SKIP_STACK_VALIDATION
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600271endif # CONFIG_STACK_VALIDATION
272
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273define rule_cc_o_c
Jan Beulich6176aa92006-01-30 10:04:27 +0100274 $(call echo-cmd,checksrc) $(cmd_checksrc) \
Nicolas Pitree4aca452016-02-17 15:50:06 -0500275 $(call cmd_and_fixdep,cc_o_c) \
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100276 $(cmd_modversions_c) \
Nicolas Pitree4aca452016-02-17 15:50:06 -0500277 $(cmd_objtool) \
278 $(call echo-cmd,record_mcount) $(cmd_record_mcount)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279endef
280
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600281define rule_as_o_S
Nicolas Pitree4aca452016-02-17 15:50:06 -0500282 $(call cmd_and_fixdep,as_o_S) \
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100283 $(cmd_modversions_S) \
Nicolas Pitree4aca452016-02-17 15:50:06 -0500284 $(cmd_objtool)
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600285endef
286
Nicolas Pitre9895c032016-01-21 17:07:24 -0500287# List module undefined symbols (or empty line if not enabled)
288ifdef CONFIG_TRIM_UNUSED_KSYMS
289cmd_undef_syms = $(NM) $@ | sed -n 's/^ \+U //p' | xargs echo
290else
291cmd_undef_syms = echo
292endif
293
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294# Built-in and composite module parts
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600295$(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_obj) FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 $(call cmd,force_checksrc)
297 $(call if_changed_rule,cc_o_c)
298
299# Single-part modules are special since we need to mark them in $(MODVERDIR)
300
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600301$(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_obj) FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 $(call cmd,force_checksrc)
303 $(call if_changed_rule,cc_o_c)
Nicolas Pitre9895c032016-01-21 17:07:24 -0500304 @{ echo $(@:.o=.ko); echo $@; \
305 $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
307quiet_cmd_cc_lst_c = MKLST $@
308 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
309 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
310 System.map $(OBJDUMP) > $@
311
Sam Ravnborg767e5812007-05-06 09:23:45 +0200312$(obj)/%.lst: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 $(call if_changed_dep,cc_lst_c)
314
315# Compile assembler sources (.S)
316# ---------------------------------------------------------------------------
317
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200318modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319
Sam Ravnborg65881692010-07-28 17:33:09 +0200320$(real-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
321$(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100323# .S file exports must have their C prototypes defined in asm/asm-prototypes.h
324# or a file that it includes, in order to get versioned symbols. We build a
325# dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
326# the .S file (with trailing ';'), and run genksyms on that, to extract vers.
327#
328# This is convoluted. The .S file must first be preprocessed to run guards and
329# expand names, then the resulting exports must be constructed into plain
330# EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
331# to make the genksyms input.
332#
333# These mirror gensymtypes_c and co above, keep them in synch.
334cmd_gensymtypes_S = \
335 (echo "\#include <linux/kernel.h>" ; \
336 echo "\#include <asm/asm-prototypes.h>" ; \
337 $(CPP) $(a_flags) $< | \
Nicholas Piggincc6acc12016-11-09 15:34:05 +1100338 grep "\<___EXPORT_SYMBOL\>" | \
339 sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ) | \
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100340 $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | \
341 $(GENKSYMS) $(if $(1), -T $(2)) \
342 $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \
343 $(if $(KBUILD_PRESERVE),-p) \
344 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
345
346quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@
347cmd_cc_symtypes_S = \
348 set -e; \
349 $(call cmd_gensymtypes_S,true,$@) >/dev/null; \
350 test -s $@ || rm -f $@
351
352$(obj)/%.symtypes : $(src)/%.S FORCE
353 $(call cmd,cc_symtypes_S)
354
355
Masahiro Yamadae0f41e52016-04-08 11:24:48 +0900356quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
357cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358
Sam Ravnborg767e5812007-05-06 09:23:45 +0200359$(obj)/%.s: $(src)/%.S FORCE
Masahiro Yamadae0f41e52016-04-08 11:24:48 +0900360 $(call if_changed_dep,cpp_s_S)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
362quiet_cmd_as_o_S = AS $(quiet_modtag) $@
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100363
364ifndef CONFIG_MODVERSIONS
365cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
366
367else
368
369ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h)
370
371ifeq ($(ASM_PROTOTYPES),)
372cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
373
374else
375
376# versioning matches the C process described above, with difference that
377# we parse asm-prototypes.h C header to get function definitions.
378
379cmd_as_o_S = $(CC) $(a_flags) -c -o $(@D)/.tmp_$(@F) $<
380
381cmd_modversions_S = \
382 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
383 $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
384 > $(@D)/.tmp_$(@F:.o=.ver); \
385 \
386 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
387 -T $(@D)/.tmp_$(@F:.o=.ver); \
388 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
389 else \
390 mv -f $(@D)/.tmp_$(@F) $@; \
391 fi;
392endif
393endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600395$(obj)/%.o: $(src)/%.S $(objtool_obj) FORCE
396 $(call if_changed_rule,as_o_S)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397
398targets += $(real-objs-y) $(real-objs-m) $(lib-y)
399targets += $(extra-y) $(MAKECMDGOALS) $(always)
400
401# Linker scripts preprocessor (.lds.S -> .lds)
402# ---------------------------------------------------------------------------
403quiet_cmd_cpp_lds_S = LDS $@
Sam Ravnborg51b563f2009-09-20 12:28:22 +0200404 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
Tim Abbott42f29a22009-09-20 18:14:12 -0400405 -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406
Sam Ravnborg767e5812007-05-06 09:23:45 +0200407$(obj)/%.lds: $(src)/%.lds.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 $(call if_changed_dep,cpp_lds_S)
409
David Howells4520c6a2012-09-21 23:31:13 +0100410# ASN.1 grammar
411# ---------------------------------------------------------------------------
412quiet_cmd_asn1_compiler = ASN.1 $@
413 cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
414 $(subst .h,.c,$@) $(subst .c,.h,$@)
415
416.PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h
417
418$(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
419 $(call cmd,asn1_compiler)
420
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421# Build the compiled-in targets
422# ---------------------------------------------------------------------------
423
424# To build objects in subdirs, we need to descend into the directories
425$(sort $(subdir-obj-y)): $(subdir-ym) ;
426
427#
428# Rule to compile a set of .o files into one .o file
429#
430ifdef builtin-target
Stephen Rothwella5967db2016-08-24 22:29:19 +1000431
432ifdef CONFIG_THIN_ARCHIVES
433 cmd_make_builtin = rm -f $@; $(AR) rcST$(KBUILD_ARFLAGS)
434 cmd_make_empty_builtin = rm -f $@; $(AR) rcST$(KBUILD_ARFLAGS)
435 quiet_cmd_link_o_target = AR $@
436else
437 cmd_make_builtin = $(LD) $(ld_flags) -r -o
438 cmd_make_empty_builtin = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS)
439 quiet_cmd_link_o_target = LD $@
440endif
441
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442# If the list of objects to link is empty, just create an empty built-in.o
443cmd_link_o_target = $(if $(strip $(obj-y)),\
Stephen Rothwella5967db2016-08-24 22:29:19 +1000444 $(cmd_make_builtin) $@ $(filter $(obj-y), $^) \
Sam Ravnborg91341d42008-01-21 21:31:44 +0100445 $(cmd_secanalysis),\
Stephen Rothwella5967db2016-08-24 22:29:19 +1000446 $(cmd_make_empty_builtin) $@)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447
448$(builtin-target): $(obj-y) FORCE
449 $(call if_changed,link_o_target)
450
451targets += $(builtin-target)
452endif # builtin-target
453
454#
Tejun Heo551559e2007-12-07 21:04:30 +0900455# Rule to create modules.order file
456#
457# Create commands to either record .ko file or cat modules.order from
458# a subdirectory
459modorder-cmds = \
460 $(foreach m, $(modorder), \
461 $(if $(filter %/modules.order, $m), \
462 cat $m;, echo kernel/$m;))
463
464$(modorder-target): $(subdir-ym) FORCE
465 $(Q)(cat /dev/null; $(modorder-cmds)) > $@
466
467#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468# Rule to compile a set of .o files into one .a file
469#
470ifdef lib-target
471quiet_cmd_link_l_target = AR $@
Stephen Rothwella5967db2016-08-24 22:29:19 +1000472
473ifdef CONFIG_THIN_ARCHIVES
474 cmd_link_l_target = rm -f $@; $(AR) rcsT$(KBUILD_ARFLAGS) $@ $(lib-y)
475else
476 cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
477endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478
479$(lib-target): $(lib-y) FORCE
480 $(call if_changed,link_l_target)
481
482targets += $(lib-target)
Al Viro7f2084f2016-01-15 14:01:22 -0500483
484dummy-object = $(obj)/.lib_exports.o
485ksyms-lds = $(dot-target).lds
486ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
487ref_prefix = EXTERN(_
488else
489ref_prefix = EXTERN(
490endif
491
492quiet_cmd_export_list = EXPORTS $@
493cmd_export_list = $(OBJDUMP) -h $< | \
494 sed -ne '/___ksymtab/{s/.*+/$(ref_prefix)/;s/ .*/)/;p}' >$(ksyms-lds);\
495 rm -f $(dummy-object);\
496 $(AR) rcs$(KBUILD_ARFLAGS) $(dummy-object);\
497 $(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\
498 rm $(dummy-object) $(ksyms-lds)
499
500$(obj)/lib-ksyms.o: $(lib-target) FORCE
501 $(call if_changed,export_list)
Nicholas Piggin989cea5c2016-10-21 01:13:33 +1100502
503targets += $(obj)/lib-ksyms.o
504
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505endif
506
507#
508# Rule to link composite objects
509#
510# Composite objects are specified in kbuild makefile as follows:
511# <composite-object>-objs := <list of .o files>
512# or
513# <composite-object>-y := <list of .o files>
Michal Marekcf4f2192015-10-27 14:02:24 +0100514# or
515# <composite-object>-m := <list of .o files>
516# The -m syntax only works if <composite object> is a module
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517link_multi_deps = \
518$(filter $(addprefix $(obj)/, \
519$($(subst $(obj)/,,$(@:.o=-objs))) \
Michal Marekcf4f2192015-10-27 14:02:24 +0100520$($(subst $(obj)/,,$(@:.o=-y))) \
521$($(subst $(obj)/,,$(@:.o=-m)))), $^)
Masahiro Yamada38385f82014-04-28 16:26:18 +0900522
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523quiet_cmd_link_multi-y = LD $@
Sam Ravnborg91341d42008-01-21 21:31:44 +0100524cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525
526quiet_cmd_link_multi-m = LD [M] $@
Roland McGrath114f5152007-07-23 01:12:08 -0700527cmd_link_multi-m = $(cmd_link_multi-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528
Masahiro Yamadac8589d12014-08-19 16:34:20 +0900529$(multi-used-y): FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 $(call if_changed,link_multi-y)
Masahiro Yamadac8589d12014-08-19 16:34:20 +0900531$(call multi_depend, $(multi-used-y), .o, -objs -y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532
Masahiro Yamadac8589d12014-08-19 16:34:20 +0900533$(multi-used-m): FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 $(call if_changed,link_multi-m)
Nicolas Pitre9895c032016-01-21 17:07:24 -0500535 @{ echo $(@:.o=.ko); echo $(link_multi_deps); \
536 $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
Michal Marekcf4f2192015-10-27 14:02:24 +0100537$(call multi_depend, $(multi-used-m), .o, -objs -y -m)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538
539targets += $(multi-used-y) $(multi-used-m)
540
541
542# Descending
543# ---------------------------------------------------------------------------
544
Paul Smith4f193362006-03-05 17:14:10 -0500545PHONY += $(subdir-ym)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546$(subdir-ym):
547 $(Q)$(MAKE) $(build)=$@
548
549# Add FORCE to the prequisites of a target to force it to be always rebuilt.
550# ---------------------------------------------------------------------------
551
Paul Smith4f193362006-03-05 17:14:10 -0500552PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553
554FORCE:
555
556# Read all saved command lines and dependencies for the $(targets) we
557# may be building above, using $(if_changed{,_dep}). As an
558# optimization, we don't need to read them if the target does not
559# exist, we will rebuild anyway in that case.
560
561targets := $(wildcard $(sort $(targets)))
562cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
563
564ifneq ($(cmd_files),)
565 include $(cmd_files)
566endif
Paul Smith4f193362006-03-05 17:14:10 -0500567
Paul Smith4f193362006-03-05 17:14:10 -0500568# Declare the contents of the .PHONY variable as phony. We keep that
569# information in a variable se we can use it in if_changed and friends.
570
571.PHONY: $(PHONY)