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b2441318 | 1 | # SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | # =========================================================================== |
3 | # Module versions | |
4 | # =========================================================================== | |
5 | # | |
6 | # Stage one of module building created the following: | |
7 | # a) The individual .o files used for the module | |
c30fe7f7 | 8 | # b) A <module>.o file which is the .o files above linked together |
b7dca6dd MY |
9 | # c) A <module>.mod file, listing the name of the preliminary <module>.o file, |
10 | # plus all .o files | |
ff9b45c5 | 11 | # d) modules.order, which lists all the modules |
1da177e4 LT |
12 | |
13 | # Stage 2 is handled by this file and does the following | |
ff9b45c5 | 14 | # 1) Find all modules listed in modules.order |
1da177e4 LT |
15 | # 2) modpost is then used to |
16 | # 3) create one <module>.mod.c file pr. module | |
17 | # 4) create one Module.symvers file with CRC for all exported symbols | |
18 | # 5) compile all <module>.mod.c files | |
e2a666d5 | 19 | # 6) final link of the module to a <module.ko> file |
1da177e4 LT |
20 | |
21 | # Step 3 is used to place certain information in the module's ELF | |
22 | # section, including information such as: | |
163d3fe6 | 23 | # Version magic (see include/linux/vermagic.h for full details) |
1da177e4 LT |
24 | # - Kernel release |
25 | # - SMP is CONFIG_SMP | |
26 | # - PREEMPT is CONFIG_PREEMPT | |
27 | # - GCC Version | |
28 | # Module info | |
29 | # - Module version (MODULE_VERSION) | |
30 | # - Module alias'es (MODULE_ALIAS) | |
31 | # - Module license (MODULE_LICENSE) | |
32 | # - See include/linux/module.h for more details | |
33 | ||
34 | # Step 4 is solely used to allow module versioning in external modules, | |
4696e295 | 35 | # where the CRC of each module is retrieved from the Module.symvers file. |
1da177e4 | 36 | |
ea837f1c SR |
37 | # KBUILD_MODPOST_WARN can be set to avoid error out in case of undefined |
38 | # symbols in the final module linking stage | |
39 | # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. | |
25985edc | 40 | # This is solely useful to speed up test compiles |
4f193362 | 41 | PHONY := _modpost |
1da177e4 LT |
42 | _modpost: __modpost |
43 | ||
c955ccaf | 44 | include include/config/auto.conf |
8ec4b4ff | 45 | include scripts/Kbuild.include |
0d96fb20 | 46 | |
25985edc | 47 | # When building external modules load the Kbuild file to retrieve EXTRA_SYMBOLS info |
0d96fb20 | 48 | ifneq ($(KBUILD_EXTMOD),) |
96d97f26 SR |
49 | |
50 | # set src + obj - they may be used when building the .mod.c file | |
51 | obj := $(KBUILD_EXTMOD) | |
52 | src := $(obj) | |
53 | ||
0d96fb20 RH |
54 | # Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS |
55 | include $(if $(wildcard $(KBUILD_EXTMOD)/Kbuild), \ | |
56 | $(KBUILD_EXTMOD)/Kbuild, $(KBUILD_EXTMOD)/Makefile) | |
57 | endif | |
58 | ||
1da177e4 LT |
59 | include scripts/Makefile.lib |
60 | ||
040fcc81 | 61 | kernelsymfile := $(objtree)/Module.symvers |
3f3fd3c0 | 62 | modulesymfile := $(firstword $(KBUILD_EXTMOD))/Module.symvers |
1da177e4 | 63 | |
ff9b45c5 MY |
64 | modorder := $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)modules.order |
65 | ||
66 | # Step 1), find all modules listed in modules.order | |
67 | ifdef CONFIG_MODULES | |
68 | modules := $(sort $(shell cat $(modorder))) | |
69 | endif | |
1da177e4 | 70 | |
ea837f1c SR |
71 | # Stop after building .o files if NOFINAL is set. Makes compile tests quicker |
72 | _modpost: $(if $(KBUILD_MODPOST_NOFINAL), $(modules:.ko:.o),$(modules)) | |
1da177e4 | 73 | |
1da177e4 LT |
74 | # Step 2), invoke modpost |
75 | # Includes step 3,4 | |
8d8d8289 SR |
76 | modpost = scripts/mod/modpost \ |
77 | $(if $(CONFIG_MODVERSIONS),-m) \ | |
78 | $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a,) \ | |
79 | $(if $(KBUILD_EXTMOD),-i,-o) $(kernelsymfile) \ | |
80 | $(if $(KBUILD_EXTMOD),-I $(modulesymfile)) \ | |
cb481993 | 81 | $(if $(KBUILD_EXTMOD),$(addprefix -e ,$(KBUILD_EXTRA_SYMBOLS))) \ |
8d8d8289 | 82 | $(if $(KBUILD_EXTMOD),-o $(modulesymfile)) \ |
47490ec1 | 83 | $(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \ |
83da1bed | 84 | $(if $(KBUILD_MODPOST_WARN),-w) |
8d8d8289 | 85 | |
eed380f3 GR |
86 | MODPOST_OPT=$(subst -i,-n,$(filter -i,$(MAKEFLAGS))) |
87 | ||
ea4054a2 | 88 | # We can go over command line length here, so be careful. |
12715d20 | 89 | quiet_cmd_modpost = MODPOST $(words $(filter-out vmlinux FORCE, $^)) modules |
ff9b45c5 | 90 | cmd_modpost = sed 's/ko$$/o/' $(modorder) | $(modpost) $(MODPOST_OPT) -s -T - |
1da177e4 | 91 | |
4f193362 | 92 | PHONY += __modpost |
12715d20 | 93 | __modpost: $(modules:.ko=.o) FORCE |
ea4054a2 | 94 | $(call cmd,modpost) $(wildcard vmlinux) |
1da177e4 | 95 | |
12715d20 | 96 | quiet_cmd_kernel-mod = MODPOST $@ |
8d8d8289 | 97 | cmd_kernel-mod = $(modpost) $@ |
12715d20 | 98 | |
741f98fe | 99 | vmlinux.o: FORCE |
12715d20 SR |
100 | $(call cmd,kernel-mod) |
101 | ||
1da177e4 | 102 | # Declare generated files as targets for modpost |
1da177e4 LT |
103 | $(modules:.ko=.mod.c): __modpost ; |
104 | ||
105 | ||
106 | # Step 5), compile all *.mod.c files | |
107 | ||
108 | # modname is set to make c_flags define KBUILD_MODNAME | |
5e8d780d | 109 | modname = $(notdir $(@:.mod.o=)) |
1da177e4 LT |
110 | |
111 | quiet_cmd_cc_o_c = CC $@ | |
6588169d | 112 | cmd_cc_o_c = $(CC) $(c_flags) $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE) \ |
1da177e4 LT |
113 | -c -o $@ $< |
114 | ||
115 | $(modules:.ko=.mod.o): %.mod.o: %.mod.c FORCE | |
116 | $(call if_changed_dep,cc_o_c) | |
117 | ||
118 | targets += $(modules:.ko=.mod.o) | |
119 | ||
fbe6e37d NP |
120 | ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) |
121 | ||
122 | # Step 6), final link of the modules with optional arch pass after final link | |
1da177e4 | 123 | quiet_cmd_ld_ko_o = LD [M] $@ |
fbe6e37d | 124 | cmd_ld_ko_o = \ |
d503ac53 | 125 | $(LD) -r $(KBUILD_LDFLAGS) \ |
fbe6e37d | 126 | $(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE) \ |
afa974b7 | 127 | -o $@ $(real-prereqs) ; \ |
fbe6e37d | 128 | $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) |
1da177e4 LT |
129 | |
130 | $(modules): %.ko :%.o %.mod.o FORCE | |
fbe6e37d | 131 | +$(call if_changed,ld_ko_o) |
1da177e4 LT |
132 | |
133 | targets += $(modules) | |
134 | ||
135 | ||
136 | # Add FORCE to the prequisites of a target to force it to be always rebuilt. | |
137 | # --------------------------------------------------------------------------- | |
138 | ||
4f193362 | 139 | PHONY += FORCE |
1da177e4 LT |
140 | |
141 | FORCE: | |
142 | ||
143 | # Read all saved command lines and dependencies for the $(targets) we | |
144 | # may be building above, using $(if_changed{,_dep}). As an | |
145 | # optimization, we don't need to read them if the target does not | |
146 | # exist, we will rebuild anyway in that case. | |
147 | ||
944cfe9b | 148 | existing-targets := $(wildcard $(sort $(targets))) |
1da177e4 | 149 | |
944cfe9b | 150 | -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) |
4f193362 | 151 | |
4f193362 | 152 | .PHONY: $(PHONY) |