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Linus Torvalds1da177e2005-04-16 15:20:36 -07001# ===========================================================================
2# Module versions
3# ===========================================================================
4#
5# Stage one of module building created the following:
6# a) The individual .o files used for the module
Uwe Zeisbergerc30fe7f2006-03-24 18:23:14 +01007# b) A <module>.o file which is the .o files above linked together
Linus Torvalds1da177e2005-04-16 15:20:36 -07008# c) A <module>.mod file in $(MODVERDIR)/, listing the name of the
9# the preliminary <module>.o file, plus all .o files
10
11# Stage 2 is handled by this file and does the following
12# 1) Find all modules from the files listed in $(MODVERDIR)/
13# 2) modpost is then used to
14# 3) create one <module>.mod.c file pr. module
15# 4) create one Module.symvers file with CRC for all exported symbols
Mathieu Desnoyersb2e3e652008-02-13 15:03:39 -080016# 4a) [CONFIG_MARKERS] create one Module.markers file listing defined markers
Linus Torvalds1da177e2005-04-16 15:20:36 -070017# 5) compile all <module>.mod.c files
18# 6) final link of the module to a <module.ko> file
19
20# Step 3 is used to place certain information in the module's ELF
21# section, including information such as:
22# Version magic (see include/vermagic.h for full details)
23# - Kernel release
24# - SMP is CONFIG_SMP
25# - PREEMPT is CONFIG_PREEMPT
26# - GCC Version
27# Module info
28# - Module version (MODULE_VERSION)
29# - Module alias'es (MODULE_ALIAS)
30# - Module license (MODULE_LICENSE)
31# - See include/linux/module.h for more details
32
33# Step 4 is solely used to allow module versioning in external modules,
Adrian Bunk943ffb52006-01-10 00:10:13 +010034# where the CRC of each module is retrieved from the Module.symers file.
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
Sam Ravnborgea837f12006-10-01 11:35:24 +020036# KBUILD_MODPOST_WARN can be set to avoid error out in case of undefined
37# symbols in the final module linking stage
38# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
39# This is solely usefull to speed up test compiles
Paul Smith4f193362006-03-05 17:14:10 -050040PHONY := _modpost
Linus Torvalds1da177e2005-04-16 15:20:36 -070041_modpost: __modpost
42
Roman Zippelc955cca2006-06-08 22:12:39 -070043include include/config/auto.conf
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +000044include scripts/Kbuild.include
Richard Hacker0d96fb22008-02-28 09:40:58 +010045
Sam Ravnborg96d97f22008-05-31 22:28:40 +020046# When building external modules load the Kbuild file to retreive EXTRA_SYMBOLS info
Richard Hacker0d96fb22008-02-28 09:40:58 +010047ifneq ($(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
Mathieu Desnoyersb2e3e652008-02-13 15:03:39 -080062kernelmarkersfile := $(objtree)/Module.markers
63modulemarkersfile := $(firstword $(KBUILD_EXTMOD))/Module.markers
64
65markersfile = $(if $(KBUILD_EXTMOD),$(modulemarkersfile),$(kernelmarkersfile))
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
67# Step 1), find all modules listed in $(MODVERDIR)/
68__modules := $(sort $(shell grep -h '\.ko' /dev/null $(wildcard $(MODVERDIR)/*.mod)))
69modules := $(patsubst %.o,%.ko, $(wildcard $(__modules:.ko=.o)))
70
Sam Ravnborgea837f12006-10-01 11:35:24 +020071# Stop after building .o files if NOFINAL is set. Makes compile tests quicker
72_modpost: $(if $(KBUILD_MODPOST_NOFINAL), $(modules:.ko:.o),$(modules))
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
Sam Ravnborg4ce6efe2008-03-23 21:38:54 +010074ifneq ($(KBUILD_BUILDHOST),$(ARCH))
75 cross_build := 1
76endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
78# Step 2), invoke modpost
79# Includes step 3,4
Sam Ravnborg8d8d8282007-07-20 22:36:56 +020080modpost = scripts/mod/modpost \
81 $(if $(CONFIG_MODVERSIONS),-m) \
82 $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a,) \
83 $(if $(KBUILD_EXTMOD),-i,-o) $(kernelsymfile) \
84 $(if $(KBUILD_EXTMOD),-I $(modulesymfile)) \
Adrian Bunkf5093912008-04-25 23:40:16 +030085 $(if $(KBUILD_EXTRA_SYMBOLS), $(patsubst %, -e %,$(EXTRA_SYMBOLS))) \
Sam Ravnborg8d8d8282007-07-20 22:36:56 +020086 $(if $(KBUILD_EXTMOD),-o $(modulesymfile)) \
Sam Ravnborg588ccd72008-01-24 21:12:37 +010087 $(if $(CONFIG_DEBUG_SECTION_MISMATCH),,-S) \
Mathieu Desnoyersb2e3e652008-02-13 15:03:39 -080088 $(if $(CONFIG_MARKERS),-K $(kernelmarkersfile)) \
89 $(if $(CONFIG_MARKERS),-M $(markersfile)) \
Sam Ravnborg4ce6efe2008-03-23 21:38:54 +010090 $(if $(KBUILD_EXTMOD)$(KBUILD_MODPOST_WARN),-w) \
91 $(if $(cross_build),-c)
Sam Ravnborg8d8d8282007-07-20 22:36:56 +020092
Sam Ravnborg12715d22006-08-08 20:43:39 +020093quiet_cmd_modpost = MODPOST $(words $(filter-out vmlinux FORCE, $^)) modules
Sam Ravnborg8d8d8282007-07-20 22:36:56 +020094 cmd_modpost = $(modpost) -s
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
Paul Smith4f193362006-03-05 17:14:10 -050096PHONY += __modpost
Sam Ravnborg12715d22006-08-08 20:43:39 +020097__modpost: $(modules:.ko=.o) FORCE
Sam Ravnborg85bd2fd2007-02-26 15:33:52 +010098 $(call cmd,modpost) $(wildcard vmlinux) $(filter-out FORCE,$^)
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
Sam Ravnborg12715d22006-08-08 20:43:39 +0200100quiet_cmd_kernel-mod = MODPOST $@
Sam Ravnborg8d8d8282007-07-20 22:36:56 +0200101 cmd_kernel-mod = $(modpost) $@
Sam Ravnborg12715d22006-08-08 20:43:39 +0200102
Sam Ravnborg741f98f2007-07-17 10:54:06 +0200103vmlinux.o: FORCE
Mathieu Desnoyersd35cb362008-07-21 14:21:38 -0700104 @rm -fr $(kernelmarkersfile)
Sam Ravnborg12715d22006-08-08 20:43:39 +0200105 $(call cmd,kernel-mod)
106
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107# Declare generated files as targets for modpost
108$(symverfile): __modpost ;
109$(modules:.ko=.mod.c): __modpost ;
110
Mathieu Desnoyersb2e3e652008-02-13 15:03:39 -0800111ifdef CONFIG_MARKERS
112$(markersfile): __modpost ;
113endif
114
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115
116# Step 5), compile all *.mod.c files
117
118# modname is set to make c_flags define KBUILD_MODNAME
Sam Ravnborg5e8d7802006-07-01 09:58:02 +0200119modname = $(notdir $(@:.mod.o=))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
121quiet_cmd_cc_o_c = CC $@
122 cmd_cc_o_c = $(CC) $(c_flags) $(CFLAGS_MODULE) \
123 -c -o $@ $<
124
125$(modules:.ko=.mod.o): %.mod.o: %.mod.c FORCE
126 $(call if_changed_dep,cc_o_c)
127
128targets += $(modules:.ko=.mod.o)
129
130# Step 6), final link of the modules
131quiet_cmd_ld_ko_o = LD [M] $@
Roland McGrath114f5152007-07-23 01:12:08 -0700132 cmd_ld_ko_o = $(LD) -r $(LDFLAGS) $(LDFLAGS_MODULE) -o $@ \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 $(filter-out FORCE,$^)
134
135$(modules): %.ko :%.o %.mod.o FORCE
136 $(call if_changed,ld_ko_o)
137
138targets += $(modules)
139
140
141# Add FORCE to the prequisites of a target to force it to be always rebuilt.
142# ---------------------------------------------------------------------------
143
Paul Smith4f193362006-03-05 17:14:10 -0500144PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145
146FORCE:
147
148# Read all saved command lines and dependencies for the $(targets) we
149# may be building above, using $(if_changed{,_dep}). As an
150# optimization, we don't need to read them if the target does not
151# exist, we will rebuild anyway in that case.
152
153targets := $(wildcard $(sort $(targets)))
154cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
155
156ifneq ($(cmd_files),)
157 include $(cmd_files)
158endif
Paul Smith4f193362006-03-05 17:14:10 -0500159
160
161# Declare the contents of the .PHONY variable as phony. We keep that
162# information in a variable se we can use it in if_changed and friends.
163
164.PHONY: $(PHONY)