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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# Module versions
4# ===========================================================================
5#
6# Stage one of module building created the following:
7# a) The individual .o files used for the module
Uwe Zeisbergerc30fe7f2006-03-24 18:23:14 +01008# b) A <module>.o file which is the .o files above linked together
Linus Torvalds1da177e2005-04-16 15:20:36 -07009# c) A <module>.mod file in $(MODVERDIR)/, listing the name of the
10# the preliminary <module>.o file, plus all .o files
11
12# Stage 2 is handled by this file and does the following
13# 1) Find all modules from the files listed in $(MODVERDIR)/
14# 2) modpost is then used to
15# 3) create one <module>.mod.c file pr. module
16# 4) create one Module.symvers file with CRC for all exported symbols
17# 5) compile all <module>.mod.c files
Rusty Russelle2a666d2012-10-19 11:53:15 +103018# 6) final link of the module to a <module.ko> file
Linus Torvalds1da177e2005-04-16 15:20:36 -070019
20# Step 3 is used to place certain information in the module's ELF
21# section, including information such as:
Geert Uytterhoeven163d3fe2011-05-25 11:09:59 +020022# Version magic (see include/linux/vermagic.h for full details)
Linus Torvalds1da177e2005-04-16 15:20:36 -070023# - Kernel release
24# - SMP is CONFIG_SMP
25# - PREEMPT is CONFIG_PREEMPT
26# - GCC Version
27# Module info
28# - Module version (MODULE_VERSION)
29# - Module alias'es (MODULE_ALIAS)
30# - Module license (MODULE_LICENSE)
31# - See include/linux/module.h for more details
32
33# Step 4 is solely used to allow module versioning in external modules,
Uwe Kleine-König4696e292010-07-30 20:43:20 +020034# where the CRC of each module is retrieved from the Module.symvers file.
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
Sam Ravnborgea837f12006-10-01 11:35:24 +020036# KBUILD_MODPOST_WARN can be set to avoid error out in case of undefined
37# symbols in the final module linking stage
38# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
Lucas De Marchi25985ed2011-03-30 22:57:33 -030039# This is solely useful to speed up test compiles
Paul Smith4f193362006-03-05 17:14:10 -050040PHONY := _modpost
Linus Torvalds1da177e2005-04-16 15:20:36 -070041_modpost: __modpost
42
Roman Zippelc955cca2006-06-08 22:12:39 -070043include include/config/auto.conf
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +000044include scripts/Kbuild.include
Richard Hacker0d96fb22008-02-28 09:40:58 +010045
Lucas De Marchi25985ed2011-03-30 22:57:33 -030046# When building external modules load the Kbuild file to retrieve EXTRA_SYMBOLS info
Richard Hacker0d96fb22008-02-28 09:40:58 +010047ifneq ($(KBUILD_EXTMOD),)
Sam Ravnborg96d97f22008-05-31 22:28:40 +020048
49# set src + obj - they may be used when building the .mod.c file
50obj := $(KBUILD_EXTMOD)
51src := $(obj)
52
Richard Hacker0d96fb22008-02-28 09:40:58 +010053# Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS
54include $(if $(wildcard $(KBUILD_EXTMOD)/Kbuild), \
55 $(KBUILD_EXTMOD)/Kbuild, $(KBUILD_EXTMOD)/Makefile)
56endif
57
Linus Torvalds1da177e2005-04-16 15:20:36 -070058include scripts/Makefile.lib
59
Sam Ravnborg040fcc82006-01-28 22:15:55 +010060kernelsymfile := $(objtree)/Module.symvers
Greg Banks3f3fd3c2006-10-17 00:10:30 -070061modulesymfile := $(firstword $(KBUILD_EXTMOD))/Module.symvers
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
63# Step 1), find all modules listed in $(MODVERDIR)/
Rusty Russellea4054a2013-04-04 17:37:38 +103064MODLISTCMD := find $(MODVERDIR) -name '*.mod' | xargs -r grep -h '\.ko$$' | sort -u
65__modules := $(shell $(MODLISTCMD))
Linus Torvalds1da177e2005-04-16 15:20:36 -070066modules := $(patsubst %.o,%.ko, $(wildcard $(__modules:.ko=.o)))
67
Sam Ravnborgea837f12006-10-01 11:35:24 +020068# Stop after building .o files if NOFINAL is set. Makes compile tests quicker
69_modpost: $(if $(KBUILD_MODPOST_NOFINAL), $(modules:.ko:.o),$(modules))
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
Linus Torvalds1da177e2005-04-16 15:20:36 -070071# Step 2), invoke modpost
72# Includes step 3,4
Sam Ravnborg8d8d8282007-07-20 22:36:56 +020073modpost = scripts/mod/modpost \
74 $(if $(CONFIG_MODVERSIONS),-m) \
75 $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a,) \
76 $(if $(KBUILD_EXTMOD),-i,-o) $(kernelsymfile) \
77 $(if $(KBUILD_EXTMOD),-I $(modulesymfile)) \
Peter Volkov92f83cc2008-10-25 15:02:52 -070078 $(if $(KBUILD_EXTRA_SYMBOLS), $(patsubst %, -e %,$(KBUILD_EXTRA_SYMBOLS))) \
Sam Ravnborg8d8d8282007-07-20 22:36:56 +020079 $(if $(KBUILD_EXTMOD),-o $(modulesymfile)) \
Sam Ravnborg588ccd72008-01-24 21:12:37 +010080 $(if $(CONFIG_DEBUG_SECTION_MISMATCH),,-S) \
Nicolas Boichat47490ec2015-10-06 09:44:42 +103081 $(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \
Andreas Schwab6543bec2013-01-20 17:58:47 +010082 $(if $(KBUILD_EXTMOD)$(KBUILD_MODPOST_WARN),-w)
Sam Ravnborg8d8d8282007-07-20 22:36:56 +020083
Guenter Roeckeed380f2013-09-23 15:23:54 +093084MODPOST_OPT=$(subst -i,-n,$(filter -i,$(MAKEFLAGS)))
85
Rusty Russellea4054a2013-04-04 17:37:38 +103086# We can go over command line length here, so be careful.
Sam Ravnborg12715d22006-08-08 20:43:39 +020087quiet_cmd_modpost = MODPOST $(words $(filter-out vmlinux FORCE, $^)) modules
Guenter Roeckeed380f2013-09-23 15:23:54 +093088 cmd_modpost = $(MODLISTCMD) | sed 's/\.ko$$/.o/' | $(modpost) $(MODPOST_OPT) -s -T -
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
Paul Smith4f193362006-03-05 17:14:10 -050090PHONY += __modpost
Sam Ravnborg12715d22006-08-08 20:43:39 +020091__modpost: $(modules:.ko=.o) FORCE
Rusty Russellea4054a2013-04-04 17:37:38 +103092 $(call cmd,modpost) $(wildcard vmlinux)
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
Sam Ravnborg12715d22006-08-08 20:43:39 +020094quiet_cmd_kernel-mod = MODPOST $@
Sam Ravnborg8d8d8282007-07-20 22:36:56 +020095 cmd_kernel-mod = $(modpost) $@
Sam Ravnborg12715d22006-08-08 20:43:39 +020096
Sam Ravnborg741f98f2007-07-17 10:54:06 +020097vmlinux.o: FORCE
Sam Ravnborg12715d22006-08-08 20:43:39 +020098 $(call cmd,kernel-mod)
99
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100# Declare generated files as targets for modpost
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101$(modules:.ko=.mod.c): __modpost ;
102
103
104# Step 5), compile all *.mod.c files
105
106# modname is set to make c_flags define KBUILD_MODNAME
Sam Ravnborg5e8d7802006-07-01 09:58:02 +0200107modname = $(notdir $(@:.mod.o=))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
109quiet_cmd_cc_o_c = CC $@
Sam Ravnborg65881692010-07-28 17:33:09 +0200110 cmd_cc_o_c = $(CC) $(c_flags) $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 -c -o $@ $<
112
113$(modules:.ko=.mod.o): %.mod.o: %.mod.c FORCE
114 $(call if_changed_dep,cc_o_c)
115
116targets += $(modules:.ko=.mod.o)
117
Nicholas Pigginfbe6e372016-08-24 22:29:21 +1000118ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
119
120# Step 6), final link of the modules with optional arch pass after final link
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121quiet_cmd_ld_ko_o = LD [M] $@
Nicholas Pigginfbe6e372016-08-24 22:29:21 +1000122 cmd_ld_ko_o = \
123 $(LD) -r $(LDFLAGS) \
124 $(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE) \
125 -o $@ $(filter-out FORCE,$^) ; \
126 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
128$(modules): %.ko :%.o %.mod.o FORCE
Nicholas Pigginfbe6e372016-08-24 22:29:21 +1000129 +$(call if_changed,ld_ko_o)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
131targets += $(modules)
132
133
134# Add FORCE to the prequisites of a target to force it to be always rebuilt.
135# ---------------------------------------------------------------------------
136
Paul Smith4f193362006-03-05 17:14:10 -0500137PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
139FORCE:
140
141# Read all saved command lines and dependencies for the $(targets) we
142# may be building above, using $(if_changed{,_dep}). As an
143# optimization, we don't need to read them if the target does not
144# exist, we will rebuild anyway in that case.
145
Masahiro Yamada2982c952017-11-13 19:29:35 +0900146cmd_files := $(wildcard $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
148ifneq ($(cmd_files),)
149 include $(cmd_files)
150endif
Paul Smith4f193362006-03-05 17:14:10 -0500151
152
153# Declare the contents of the .PHONY variable as phony. We keep that
154# information in a variable se we can use it in if_changed and friends.
155
156.PHONY: $(PHONY)