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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 | |
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/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, | |
943ffb58 | 33 | # where the CRC of each module is retrieved from the Module.symers file. |
1da177e4 | 34 | |
ea837f1c SR |
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 usefull to speed up test compiles | |
4f193362 | 39 | PHONY := _modpost |
1da177e4 LT |
40 | _modpost: __modpost |
41 | ||
c955ccaf | 42 | include include/config/auto.conf |
8ec4b4ff | 43 | include scripts/Kbuild.include |
1da177e4 LT |
44 | include scripts/Makefile.lib |
45 | ||
040fcc81 | 46 | kernelsymfile := $(objtree)/Module.symvers |
3f3fd3c0 | 47 | modulesymfile := $(firstword $(KBUILD_EXTMOD))/Module.symvers |
1da177e4 LT |
48 | |
49 | # Step 1), find all modules listed in $(MODVERDIR)/ | |
50 | __modules := $(sort $(shell grep -h '\.ko' /dev/null $(wildcard $(MODVERDIR)/*.mod))) | |
51 | modules := $(patsubst %.o,%.ko, $(wildcard $(__modules:.ko=.o))) | |
52 | ||
ea837f1c SR |
53 | # Stop after building .o files if NOFINAL is set. Makes compile tests quicker |
54 | _modpost: $(if $(KBUILD_MODPOST_NOFINAL), $(modules:.ko:.o),$(modules)) | |
1da177e4 LT |
55 | |
56 | ||
57 | # Step 2), invoke modpost | |
58 | # Includes step 3,4 | |
12715d20 | 59 | quiet_cmd_modpost = MODPOST $(words $(filter-out vmlinux FORCE, $^)) modules |
1da177e4 LT |
60 | cmd_modpost = scripts/mod/modpost \ |
61 | $(if $(CONFIG_MODVERSIONS),-m) \ | |
62 | $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a,) \ | |
040fcc81 SR |
63 | $(if $(KBUILD_EXTMOD),-i,-o) $(kernelsymfile) \ |
64 | $(if $(KBUILD_EXTMOD),-I $(modulesymfile)) \ | |
65 | $(if $(KBUILD_EXTMOD),-o $(modulesymfile)) \ | |
85bd2fdd | 66 | $(if $(KBUILD_EXTMOD)$(KBUILD_MODPOST_WARN),-w) |
1da177e4 | 67 | |
4f193362 | 68 | PHONY += __modpost |
12715d20 | 69 | __modpost: $(modules:.ko=.o) FORCE |
85bd2fdd | 70 | $(call cmd,modpost) $(wildcard vmlinux) $(filter-out FORCE,$^) |
1da177e4 | 71 | |
12715d20 | 72 | quiet_cmd_kernel-mod = MODPOST $@ |
85bd2fdd | 73 | cmd_kernel-mod = $(cmd_modpost) $(KBUILD_VMLINUX_OBJS) |
12715d20 | 74 | |
85bd2fdd | 75 | PHONY += vmlinux |
12715d20 SR |
76 | vmlinux: FORCE |
77 | $(call cmd,kernel-mod) | |
78 | ||
1da177e4 LT |
79 | # Declare generated files as targets for modpost |
80 | $(symverfile): __modpost ; | |
81 | $(modules:.ko=.mod.c): __modpost ; | |
82 | ||
83 | ||
84 | # Step 5), compile all *.mod.c files | |
85 | ||
86 | # modname is set to make c_flags define KBUILD_MODNAME | |
5e8d780d | 87 | modname = $(notdir $(@:.mod.o=)) |
1da177e4 LT |
88 | |
89 | quiet_cmd_cc_o_c = CC $@ | |
90 | cmd_cc_o_c = $(CC) $(c_flags) $(CFLAGS_MODULE) \ | |
91 | -c -o $@ $< | |
92 | ||
93 | $(modules:.ko=.mod.o): %.mod.o: %.mod.c FORCE | |
94 | $(call if_changed_dep,cc_o_c) | |
95 | ||
96 | targets += $(modules:.ko=.mod.o) | |
97 | ||
98 | # Step 6), final link of the modules | |
99 | quiet_cmd_ld_ko_o = LD [M] $@ | |
ea837f1c | 100 | cmd_ld_ko_o = $(LD) $(LDFLAGS) $(LDFLAGS_MODULE) -o $@ \ |
1da177e4 LT |
101 | $(filter-out FORCE,$^) |
102 | ||
103 | $(modules): %.ko :%.o %.mod.o FORCE | |
104 | $(call if_changed,ld_ko_o) | |
105 | ||
106 | targets += $(modules) | |
107 | ||
108 | ||
109 | # Add FORCE to the prequisites of a target to force it to be always rebuilt. | |
110 | # --------------------------------------------------------------------------- | |
111 | ||
4f193362 | 112 | PHONY += FORCE |
1da177e4 LT |
113 | |
114 | FORCE: | |
115 | ||
116 | # Read all saved command lines and dependencies for the $(targets) we | |
117 | # may be building above, using $(if_changed{,_dep}). As an | |
118 | # optimization, we don't need to read them if the target does not | |
119 | # exist, we will rebuild anyway in that case. | |
120 | ||
121 | targets := $(wildcard $(sort $(targets))) | |
122 | cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) | |
123 | ||
124 | ifneq ($(cmd_files),) | |
125 | include $(cmd_files) | |
126 | endif | |
4f193362 PS |
127 | |
128 | ||
129 | # Declare the contents of the .PHONY variable as phony. We keep that | |
130 | # information in a variable se we can use it in if_changed and friends. | |
131 | ||
132 | .PHONY: $(PHONY) |