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1da177e4 LT |
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 |
1da177e4 LT |
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 | |
b2e3e658 | 16 | # 4a) [CONFIG_MARKERS] create one Module.markers file listing defined markers |
1da177e4 LT |
17 | # 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, | |
943ffb58 | 34 | # where the CRC of each module is retrieved from the Module.symers file. |
1da177e4 | 35 | |
ea837f1c SR |
36 | # 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 | |
4f193362 | 40 | PHONY := _modpost |
1da177e4 LT |
41 | _modpost: __modpost |
42 | ||
c955ccaf | 43 | include include/config/auto.conf |
8ec4b4ff | 44 | include scripts/Kbuild.include |
1da177e4 LT |
45 | include scripts/Makefile.lib |
46 | ||
040fcc81 | 47 | kernelsymfile := $(objtree)/Module.symvers |
3f3fd3c0 | 48 | modulesymfile := $(firstword $(KBUILD_EXTMOD))/Module.symvers |
b2e3e658 MD |
49 | kernelmarkersfile := $(objtree)/Module.markers |
50 | modulemarkersfile := $(firstword $(KBUILD_EXTMOD))/Module.markers | |
51 | ||
52 | markersfile = $(if $(KBUILD_EXTMOD),$(modulemarkersfile),$(kernelmarkersfile)) | |
1da177e4 LT |
53 | |
54 | # Step 1), find all modules listed in $(MODVERDIR)/ | |
55 | __modules := $(sort $(shell grep -h '\.ko' /dev/null $(wildcard $(MODVERDIR)/*.mod))) | |
56 | modules := $(patsubst %.o,%.ko, $(wildcard $(__modules:.ko=.o))) | |
57 | ||
ea837f1c SR |
58 | # Stop after building .o files if NOFINAL is set. Makes compile tests quicker |
59 | _modpost: $(if $(KBUILD_MODPOST_NOFINAL), $(modules:.ko:.o),$(modules)) | |
1da177e4 | 60 | |
4ce6efed SR |
61 | ifneq ($(KBUILD_BUILDHOST),$(ARCH)) |
62 | cross_build := 1 | |
63 | endif | |
1da177e4 LT |
64 | |
65 | # Step 2), invoke modpost | |
66 | # Includes step 3,4 | |
8d8d8289 SR |
67 | modpost = scripts/mod/modpost \ |
68 | $(if $(CONFIG_MODVERSIONS),-m) \ | |
69 | $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a,) \ | |
70 | $(if $(KBUILD_EXTMOD),-i,-o) $(kernelsymfile) \ | |
71 | $(if $(KBUILD_EXTMOD),-I $(modulesymfile)) \ | |
72 | $(if $(KBUILD_EXTMOD),-o $(modulesymfile)) \ | |
588ccd73 | 73 | $(if $(CONFIG_DEBUG_SECTION_MISMATCH),,-S) \ |
b2e3e658 MD |
74 | $(if $(CONFIG_MARKERS),-K $(kernelmarkersfile)) \ |
75 | $(if $(CONFIG_MARKERS),-M $(markersfile)) \ | |
4ce6efed SR |
76 | $(if $(KBUILD_EXTMOD)$(KBUILD_MODPOST_WARN),-w) \ |
77 | $(if $(cross_build),-c) | |
8d8d8289 | 78 | |
12715d20 | 79 | quiet_cmd_modpost = MODPOST $(words $(filter-out vmlinux FORCE, $^)) modules |
8d8d8289 | 80 | cmd_modpost = $(modpost) -s |
1da177e4 | 81 | |
4f193362 | 82 | PHONY += __modpost |
12715d20 | 83 | __modpost: $(modules:.ko=.o) FORCE |
85bd2fdd | 84 | $(call cmd,modpost) $(wildcard vmlinux) $(filter-out FORCE,$^) |
1da177e4 | 85 | |
12715d20 | 86 | quiet_cmd_kernel-mod = MODPOST $@ |
8d8d8289 | 87 | cmd_kernel-mod = $(modpost) $@ |
12715d20 | 88 | |
741f98fe | 89 | vmlinux.o: FORCE |
12715d20 SR |
90 | $(call cmd,kernel-mod) |
91 | ||
1da177e4 LT |
92 | # Declare generated files as targets for modpost |
93 | $(symverfile): __modpost ; | |
94 | $(modules:.ko=.mod.c): __modpost ; | |
95 | ||
b2e3e658 MD |
96 | ifdef CONFIG_MARKERS |
97 | $(markersfile): __modpost ; | |
98 | endif | |
99 | ||
1da177e4 LT |
100 | |
101 | # Step 5), compile all *.mod.c files | |
102 | ||
103 | # modname is set to make c_flags define KBUILD_MODNAME | |
5e8d780d | 104 | modname = $(notdir $(@:.mod.o=)) |
1da177e4 LT |
105 | |
106 | quiet_cmd_cc_o_c = CC $@ | |
107 | cmd_cc_o_c = $(CC) $(c_flags) $(CFLAGS_MODULE) \ | |
108 | -c -o $@ $< | |
109 | ||
110 | $(modules:.ko=.mod.o): %.mod.o: %.mod.c FORCE | |
111 | $(call if_changed_dep,cc_o_c) | |
112 | ||
113 | targets += $(modules:.ko=.mod.o) | |
114 | ||
115 | # Step 6), final link of the modules | |
116 | quiet_cmd_ld_ko_o = LD [M] $@ | |
114f5157 | 117 | cmd_ld_ko_o = $(LD) -r $(LDFLAGS) $(LDFLAGS_MODULE) -o $@ \ |
1da177e4 LT |
118 | $(filter-out FORCE,$^) |
119 | ||
120 | $(modules): %.ko :%.o %.mod.o FORCE | |
121 | $(call if_changed,ld_ko_o) | |
122 | ||
123 | targets += $(modules) | |
124 | ||
125 | ||
126 | # Add FORCE to the prequisites of a target to force it to be always rebuilt. | |
127 | # --------------------------------------------------------------------------- | |
128 | ||
4f193362 | 129 | PHONY += FORCE |
1da177e4 LT |
130 | |
131 | FORCE: | |
132 | ||
133 | # Read all saved command lines and dependencies for the $(targets) we | |
134 | # may be building above, using $(if_changed{,_dep}). As an | |
135 | # optimization, we don't need to read them if the target does not | |
136 | # exist, we will rebuild anyway in that case. | |
137 | ||
138 | targets := $(wildcard $(sort $(targets))) | |
139 | cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) | |
140 | ||
141 | ifneq ($(cmd_files),) | |
142 | include $(cmd_files) | |
143 | endif | |
4f193362 PS |
144 | |
145 | ||
146 | # Declare the contents of the .PHONY variable as phony. We keep that | |
147 | # information in a variable se we can use it in if_changed and friends. | |
148 | ||
149 | .PHONY: $(PHONY) |