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1# ===========================================================================
2# Module versions
3# ===========================================================================
4#
5# Stage one of module building created the following:
6# a) The individual .o files used for the module
c30fe7f7 7# b) A <module>.o file which is the .o files above linked together
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8# 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 $(MODVERDIR)/
13# 2) modpost is then used to
14# 3) create one <module>.mod.c file pr. module
15# 4) create one Module.symvers file with CRC for all exported symbols
16# 5) compile all <module>.mod.c files
e2a666d5 17# 6) final link of the module to a <module.ko> file
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18
19# Step 3 is used to place certain information in the module's ELF
20# section, including information such as:
163d3fe6 21# Version magic (see include/linux/vermagic.h for full details)
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22# - Kernel release
23# - SMP is CONFIG_SMP
24# - PREEMPT is CONFIG_PREEMPT
25# - GCC Version
26# Module info
27# - Module version (MODULE_VERSION)
28# - Module alias'es (MODULE_ALIAS)
29# - Module license (MODULE_LICENSE)
30# - See include/linux/module.h for more details
31
32# Step 4 is solely used to allow module versioning in external modules,
4696e295 33# where the CRC of each module is retrieved from the Module.symvers file.
1da177e4 34
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35# KBUILD_MODPOST_WARN can be set to avoid error out in case of undefined
36# symbols in the final module linking stage
37# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
25985edc 38# This is solely useful to speed up test compiles
4f193362 39PHONY := _modpost
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40_modpost: __modpost
41
c955ccaf 42include include/config/auto.conf
8ec4b4ff 43include scripts/Kbuild.include
0d96fb20 44
25985edc 45# When building external modules load the Kbuild file to retrieve EXTRA_SYMBOLS info
0d96fb20 46ifneq ($(KBUILD_EXTMOD),)
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47
48# set src + obj - they may be used when building the .mod.c file
49obj := $(KBUILD_EXTMOD)
50src := $(obj)
51
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52# Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS
53include $(if $(wildcard $(KBUILD_EXTMOD)/Kbuild), \
54 $(KBUILD_EXTMOD)/Kbuild, $(KBUILD_EXTMOD)/Makefile)
55endif
56
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57include scripts/Makefile.lib
58
040fcc81 59kernelsymfile := $(objtree)/Module.symvers
3f3fd3c0 60modulesymfile := $(firstword $(KBUILD_EXTMOD))/Module.symvers
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61
62# Step 1), find all modules listed in $(MODVERDIR)/
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63MODLISTCMD := find $(MODVERDIR) -name '*.mod' | xargs -r grep -h '\.ko$$' | sort -u
64__modules := $(shell $(MODLISTCMD))
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65modules := $(patsubst %.o,%.ko, $(wildcard $(__modules:.ko=.o)))
66
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67# Stop after building .o files if NOFINAL is set. Makes compile tests quicker
68_modpost: $(if $(KBUILD_MODPOST_NOFINAL), $(modules:.ko:.o),$(modules))
1da177e4 69
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70# Step 2), invoke modpost
71# Includes step 3,4
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72modpost = scripts/mod/modpost \
73 $(if $(CONFIG_MODVERSIONS),-m) \
74 $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a,) \
75 $(if $(KBUILD_EXTMOD),-i,-o) $(kernelsymfile) \
76 $(if $(KBUILD_EXTMOD),-I $(modulesymfile)) \
92f83cc5 77 $(if $(KBUILD_EXTRA_SYMBOLS), $(patsubst %, -e %,$(KBUILD_EXTRA_SYMBOLS))) \
8d8d8289 78 $(if $(KBUILD_EXTMOD),-o $(modulesymfile)) \
588ccd73 79 $(if $(CONFIG_DEBUG_SECTION_MISMATCH),,-S) \
47490ec1 80 $(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \
6543becf 81 $(if $(KBUILD_EXTMOD)$(KBUILD_MODPOST_WARN),-w)
8d8d8289 82
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83MODPOST_OPT=$(subst -i,-n,$(filter -i,$(MAKEFLAGS)))
84
ea4054a2 85# We can go over command line length here, so be careful.
12715d20 86quiet_cmd_modpost = MODPOST $(words $(filter-out vmlinux FORCE, $^)) modules
eed380f3 87 cmd_modpost = $(MODLISTCMD) | sed 's/\.ko$$/.o/' | $(modpost) $(MODPOST_OPT) -s -T -
1da177e4 88
4f193362 89PHONY += __modpost
12715d20 90__modpost: $(modules:.ko=.o) FORCE
ea4054a2 91 $(call cmd,modpost) $(wildcard vmlinux)
1da177e4 92
12715d20 93quiet_cmd_kernel-mod = MODPOST $@
8d8d8289 94 cmd_kernel-mod = $(modpost) $@
12715d20 95
741f98fe 96vmlinux.o: FORCE
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97 $(call cmd,kernel-mod)
98
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99# Declare generated files as targets for modpost
100$(symverfile): __modpost ;
101$(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
5e8d780d 107modname = $(notdir $(@:.mod.o=))
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108
109quiet_cmd_cc_o_c = CC $@
6588169d 110 cmd_cc_o_c = $(CC) $(c_flags) $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE) \
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111 -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
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118ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
119
120# Step 6), final link of the modules with optional arch pass after final link
1da177e4 121quiet_cmd_ld_ko_o = LD [M] $@
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122 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) $@, true)
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127
128$(modules): %.ko :%.o %.mod.o FORCE
fbe6e37d 129 +$(call if_changed,ld_ko_o)
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130
131targets += $(modules)
132
133
134# Add FORCE to the prequisites of a target to force it to be always rebuilt.
135# ---------------------------------------------------------------------------
136
4f193362 137PHONY += FORCE
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138
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
146targets := $(wildcard $(sort $(targets)))
147cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
148
149ifneq ($(cmd_files),)
150 include $(cmd_files)
151endif
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152
153
154# Declare the contents of the .PHONY variable as phony. We keep that
155# information in a variable se we can use it in if_changed and friends.
156
157.PHONY: $(PHONY)