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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 |
7 | # b) A <module>.o file which is the .o files above linked together |
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 $(MODVERDIR)/ |
13 | # 2) modpost is then used to |
14 | # 3) create one <module>.mod.c file pr. module |
15 | # 4) create one Module.symvers file with CRC for all exported symbols |
16 | # 5) compile all <module>.mod.c files |
17 | # 6) final link of the module to a <module.ko> file |
18 | |
19 | # Step 3 is used to place certain information in the module's ELF |
20 | # section, including information such as: |
21 | # Version magic (see include/linux/vermagic.h for full details) |
22 | # - Kernel release |
23 | # - SMP is CONFIG_SMP |
24 | # - PREEMPT is CONFIG_PREEMPT |
25 | # - GCC Version |
26 | # Module info |
27 | # - Module version (MODULE_VERSION) |
28 | # - Module alias'es (MODULE_ALIAS) |
29 | # - Module license (MODULE_LICENSE) |
30 | # - See include/linux/module.h for more details |
31 | |
32 | # Step 4 is solely used to allow module versioning in external modules, |
33 | # where the CRC of each module is retrieved from the Module.symvers file. |
34 | |
35 | # KBUILD_MODPOST_WARN can be set to avoid error out in case of undefined |
36 | # symbols in the final module linking stage |
37 | # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. |
38 | # This is solely useful to speed up test compiles |
39 | PHONY := _modpost |
40 | _modpost: __modpost |
41 | |
42 | include include/config/auto.conf |
43 | include scripts/Kbuild.include |
44 | |
45 | # When building external modules load the Kbuild file to retrieve EXTRA_SYMBOLS info |
46 | ifneq ($(KBUILD_EXTMOD),) |
47 | |
48 | # set src + obj - they may be used when building the .mod.c file |
49 | obj := $(KBUILD_EXTMOD) |
50 | src := $(obj) |
51 | |
52 | # Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS |
53 | include $(if $(wildcard $(KBUILD_EXTMOD)/Kbuild), \ |
54 | $(KBUILD_EXTMOD)/Kbuild, $(KBUILD_EXTMOD)/Makefile) |
55 | endif |
56 | |
57 | include scripts/Makefile.lib |
58 | |
59 | kernelsymfile := $(objtree)/Module.symvers |
60 | modulesymfile := $(firstword $(KBUILD_EXTMOD))/Module.symvers |
61 | |
62 | # Step 1), find all modules listed in $(MODVERDIR)/ |
63 | __modules := $(sort $(shell grep -h '\.ko' /dev/null $(wildcard $(MODVERDIR)/*.mod))) |
64 | modules := $(patsubst %.o,%.ko, $(wildcard $(__modules:.ko=.o))) |
65 | |
66 | # Stop after building .o files if NOFINAL is set. Makes compile tests quicker |
67 | _modpost: $(if $(KBUILD_MODPOST_NOFINAL), $(modules:.ko:.o),$(modules)) |
68 | |
69 | ifneq ($(KBUILD_BUILDHOST),$(ARCH)) |
70 | cross_build := 1 |
71 | endif |
72 | |
73 | # Step 2), invoke modpost |
74 | # Includes step 3,4 |
75 | modpost = scripts/mod/modpost \ |
76 | $(if $(CONFIG_MODVERSIONS),-m) \ |
77 | $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a,) \ |
78 | $(if $(KBUILD_EXTMOD),-i,-o) $(kernelsymfile) \ |
79 | $(if $(KBUILD_EXTMOD),-I $(modulesymfile)) \ |
80 | $(if $(KBUILD_EXTRA_SYMBOLS), $(patsubst %, -e %,$(KBUILD_EXTRA_SYMBOLS))) \ |
81 | $(if $(KBUILD_EXTMOD),-o $(modulesymfile)) \ |
82 | $(if $(CONFIG_DEBUG_SECTION_MISMATCH),,-S) \ |
83 | $(if $(KBUILD_EXTMOD)$(KBUILD_MODPOST_WARN),-w) \ |
84 | $(if $(cross_build),-c) |
85 | |
86 | quiet_cmd_modpost = MODPOST $(words $(filter-out vmlinux FORCE, $^)) modules |
87 | cmd_modpost = $(modpost) -s |
88 | |
89 | PHONY += __modpost |
90 | __modpost: $(modules:.ko=.o) FORCE |
91 | $(call cmd,modpost) $(wildcard vmlinux) $(filter-out FORCE,$^) |
92 | |
93 | quiet_cmd_kernel-mod = MODPOST $@ |
94 | cmd_kernel-mod = $(modpost) $@ |
95 | |
96 | vmlinux.o: FORCE |
97 | $(call cmd,kernel-mod) |
98 | |
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 |
107 | modname = $(notdir $(@:.mod.o=)) |
108 | |
109 | quiet_cmd_cc_o_c = CC $@ |
110 | cmd_cc_o_c = $(CC) $(c_flags) $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE) \ |
111 | -c -o $@ $< |
112 | |
113 | $(modules:.ko=.mod.o): %.mod.o: %.mod.c FORCE |
114 | $(call if_changed_dep,cc_o_c) |
115 | |
116 | targets += $(modules:.ko=.mod.o) |
117 | |
118 | # Step 6), final link of the modules |
119 | quiet_cmd_ld_ko_o = LD [M] $@ |
120 | cmd_ld_ko_o = $(LD) -r $(LDFLAGS) \ |
121 | $(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE) \ |
122 | -o $@ $(filter-out FORCE,$^) |
123 | |
124 | $(modules): %.ko :%.o %.mod.o FORCE |
125 | $(call if_changed,ld_ko_o) |
126 | |
127 | targets += $(modules) |
128 | |
129 | |
130 | # Add FORCE to the prequisites of a target to force it to be always rebuilt. |
131 | # --------------------------------------------------------------------------- |
132 | |
133 | PHONY += FORCE |
134 | |
135 | FORCE: |
136 | |
137 | # Read all saved command lines and dependencies for the $(targets) we |
138 | # may be building above, using $(if_changed{,_dep}). As an |
139 | # optimization, we don't need to read them if the target does not |
140 | # exist, we will rebuild anyway in that case. |
141 | |
142 | targets := $(wildcard $(sort $(targets))) |
143 | cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) |
144 | |
145 | ifneq ($(cmd_files),) |
146 | include $(cmd_files) |
147 | endif |
148 | |
149 | |
150 | # Declare the contents of the .PHONY variable as phony. We keep that |
151 | # information in a variable se we can use it in if_changed and friends. |
152 | |
153 | .PHONY: $(PHONY) |
154 |
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od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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v3.9