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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 $(MODVERDIR)/ | |
13 | # 2) modpost is then used to | |
14 | # 3) create one <module>.mod.c file pr. module | |
15 | # 4) create one Module.symvers file with CRC for all exported symbols | |
16 | # 5) compile all <module>.mod.c files | |
80d65e58 DH |
17 | # 6) final link of the module to a <module.ko> (or <module.unsigned>) file |
18 | # 7) signs the modules to a <module.ko> file | |
1da177e4 LT |
19 | |
20 | # Step 3 is used to place certain information in the module's ELF | |
21 | # section, including information such as: | |
163d3fe6 | 22 | # Version magic (see include/linux/vermagic.h for full details) |
1da177e4 LT |
23 | # - Kernel release |
24 | # - SMP is CONFIG_SMP | |
25 | # - PREEMPT is CONFIG_PREEMPT | |
26 | # - GCC Version | |
27 | # Module info | |
28 | # - Module version (MODULE_VERSION) | |
29 | # - Module alias'es (MODULE_ALIAS) | |
30 | # - Module license (MODULE_LICENSE) | |
31 | # - See include/linux/module.h for more details | |
32 | ||
33 | # Step 4 is solely used to allow module versioning in external modules, | |
4696e295 | 34 | # where the CRC of each module is retrieved from the Module.symvers file. |
1da177e4 | 35 | |
80d65e58 DH |
36 | # Step 7 is dependent on CONFIG_MODULE_SIG being enabled. |
37 | ||
ea837f1c SR |
38 | # KBUILD_MODPOST_WARN can be set to avoid error out in case of undefined |
39 | # symbols in the final module linking stage | |
40 | # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. | |
25985edc | 41 | # This is solely useful to speed up test compiles |
4f193362 | 42 | PHONY := _modpost |
1da177e4 LT |
43 | _modpost: __modpost |
44 | ||
c955ccaf | 45 | include include/config/auto.conf |
8ec4b4ff | 46 | include scripts/Kbuild.include |
0d96fb20 | 47 | |
25985edc | 48 | # When building external modules load the Kbuild file to retrieve EXTRA_SYMBOLS info |
0d96fb20 | 49 | ifneq ($(KBUILD_EXTMOD),) |
96d97f26 SR |
50 | |
51 | # set src + obj - they may be used when building the .mod.c file | |
52 | obj := $(KBUILD_EXTMOD) | |
53 | src := $(obj) | |
54 | ||
0d96fb20 RH |
55 | # Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS |
56 | include $(if $(wildcard $(KBUILD_EXTMOD)/Kbuild), \ | |
57 | $(KBUILD_EXTMOD)/Kbuild, $(KBUILD_EXTMOD)/Makefile) | |
58 | endif | |
59 | ||
1da177e4 LT |
60 | include scripts/Makefile.lib |
61 | ||
040fcc81 | 62 | kernelsymfile := $(objtree)/Module.symvers |
3f3fd3c0 | 63 | modulesymfile := $(firstword $(KBUILD_EXTMOD))/Module.symvers |
1da177e4 LT |
64 | |
65 | # Step 1), find all modules listed in $(MODVERDIR)/ | |
ef591a55 | 66 | __modules := $(sort $(shell grep -h '\.ko$$' /dev/null $(wildcard $(MODVERDIR)/*.mod))) |
1da177e4 LT |
67 | modules := $(patsubst %.o,%.ko, $(wildcard $(__modules:.ko=.o))) |
68 | ||
ea837f1c SR |
69 | # Stop after building .o files if NOFINAL is set. Makes compile tests quicker |
70 | _modpost: $(if $(KBUILD_MODPOST_NOFINAL), $(modules:.ko:.o),$(modules)) | |
1da177e4 | 71 | |
4ce6efed SR |
72 | ifneq ($(KBUILD_BUILDHOST),$(ARCH)) |
73 | cross_build := 1 | |
74 | endif | |
1da177e4 LT |
75 | |
76 | # Step 2), invoke modpost | |
77 | # Includes step 3,4 | |
8d8d8289 SR |
78 | modpost = scripts/mod/modpost \ |
79 | $(if $(CONFIG_MODVERSIONS),-m) \ | |
80 | $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a,) \ | |
81 | $(if $(KBUILD_EXTMOD),-i,-o) $(kernelsymfile) \ | |
82 | $(if $(KBUILD_EXTMOD),-I $(modulesymfile)) \ | |
92f83cc5 | 83 | $(if $(KBUILD_EXTRA_SYMBOLS), $(patsubst %, -e %,$(KBUILD_EXTRA_SYMBOLS))) \ |
8d8d8289 | 84 | $(if $(KBUILD_EXTMOD),-o $(modulesymfile)) \ |
588ccd73 | 85 | $(if $(CONFIG_DEBUG_SECTION_MISMATCH),,-S) \ |
4ce6efed SR |
86 | $(if $(KBUILD_EXTMOD)$(KBUILD_MODPOST_WARN),-w) \ |
87 | $(if $(cross_build),-c) | |
8d8d8289 | 88 | |
12715d20 | 89 | quiet_cmd_modpost = MODPOST $(words $(filter-out vmlinux FORCE, $^)) modules |
8d8d8289 | 90 | cmd_modpost = $(modpost) -s |
1da177e4 | 91 | |
4f193362 | 92 | PHONY += __modpost |
12715d20 | 93 | __modpost: $(modules:.ko=.o) FORCE |
85bd2fdd | 94 | $(call cmd,modpost) $(wildcard vmlinux) $(filter-out FORCE,$^) |
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 LT |
102 | # Declare generated files as targets for modpost |
103 | $(symverfile): __modpost ; | |
104 | $(modules:.ko=.mod.c): __modpost ; | |
105 | ||
106 | ||
107 | # Step 5), compile all *.mod.c files | |
108 | ||
109 | # modname is set to make c_flags define KBUILD_MODNAME | |
5e8d780d | 110 | modname = $(notdir $(@:.mod.o=)) |
1da177e4 LT |
111 | |
112 | quiet_cmd_cc_o_c = CC $@ | |
6588169d | 113 | cmd_cc_o_c = $(CC) $(c_flags) $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE) \ |
1da177e4 LT |
114 | -c -o $@ $< |
115 | ||
116 | $(modules:.ko=.mod.o): %.mod.o: %.mod.c FORCE | |
117 | $(call if_changed_dep,cc_o_c) | |
118 | ||
119 | targets += $(modules:.ko=.mod.o) | |
120 | ||
121 | # Step 6), final link of the modules | |
80d65e58 | 122 | ifneq ($(CONFIG_MODULE_SIG),y) |
1da177e4 | 123 | quiet_cmd_ld_ko_o = LD [M] $@ |
6588169d SR |
124 | cmd_ld_ko_o = $(LD) -r $(LDFLAGS) \ |
125 | $(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE) \ | |
126 | -o $@ $(filter-out FORCE,$^) | |
1da177e4 LT |
127 | |
128 | $(modules): %.ko :%.o %.mod.o FORCE | |
129 | $(call if_changed,ld_ko_o) | |
130 | ||
131 | targets += $(modules) | |
80d65e58 DH |
132 | else |
133 | quiet_cmd_ld_ko_unsigned_o = LD [M] $@ | |
134 | cmd_ld_ko_unsigned_o = \ | |
135 | $(LD) -r $(LDFLAGS) \ | |
136 | $(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE) \ | |
137 | -o $@ $(filter-out FORCE,$^) \ | |
138 | $(if $(AFTER_LINK),; $(AFTER_LINK)) | |
139 | ||
140 | $(modules:.ko=.ko.unsigned): %.ko.unsigned :%.o %.mod.o FORCE | |
141 | $(call if_changed,ld_ko_unsigned_o) | |
142 | ||
143 | targets += $(modules:.ko=.ko.unsigned) | |
144 | ||
145 | # Step 7), sign the modules | |
146 | MODSECKEY = ./signing_key.priv | |
147 | MODPUBKEY = ./signing_key.x509 | |
148 | ||
149 | ifeq ($(wildcard $(MODSECKEY))+$(wildcard $(MODPUBKEY)),$(MODSECKEY)+$(MODPUBKEY)) | |
150 | ifeq ($(KBUILD_SRC),) | |
151 | # no O= is being used | |
152 | SCRIPTS_DIR := scripts | |
153 | else | |
154 | SCRIPTS_DIR := $(KBUILD_SRC)/scripts | |
155 | endif | |
156 | SIGN_MODULES := 1 | |
157 | else | |
158 | SIGN_MODULES := 0 | |
159 | endif | |
160 | ||
161 | # only sign if it's an in-tree module | |
162 | ifneq ($(KBUILD_EXTMOD),) | |
163 | SIGN_MODULES := 0 | |
164 | endif | |
1da177e4 | 165 | |
80d65e58 DH |
166 | # We strip the module as best we can - note that using both strip and eu-strip |
167 | # results in a smaller module than using either alone. | |
168 | EU_STRIP = $(shell which eu-strip || echo true) | |
169 | ||
170 | quiet_cmd_sign_ko_stripped_ko_unsigned = STRIP [M] $@ | |
171 | cmd_sign_ko_stripped_ko_unsigned = \ | |
172 | cp $< $@ && \ | |
173 | strip -x -g $@ && \ | |
174 | $(EU_STRIP) $@ | |
175 | ||
176 | ifeq ($(SIGN_MODULES),1) | |
177 | ||
178 | quiet_cmd_genkeyid = GENKEYID $@ | |
179 | cmd_genkeyid = \ | |
180 | perl $(SCRIPTS_DIR)/x509keyid $< $<.signer $<.keyid | |
181 | ||
182 | %.signer %.keyid: % | |
183 | $(call if_changed,genkeyid) | |
184 | ||
185 | KEYRING_DEP := $(MODSECKEY) $(MODPUBKEY) $(MODPUBKEY).signer $(MODPUBKEY).keyid | |
186 | quiet_cmd_sign_ko_ko_stripped = SIGN [M] $@ | |
187 | cmd_sign_ko_ko_stripped = \ | |
188 | sh $(SCRIPTS_DIR)/sign-file $(MODSECKEY) $(MODPUBKEY) $< $@ | |
189 | else | |
190 | KEYRING_DEP := | |
191 | quiet_cmd_sign_ko_ko_unsigned = NO SIGN [M] $@ | |
192 | cmd_sign_ko_ko_unsigned = \ | |
193 | cp $< $@ | |
194 | endif | |
195 | ||
196 | $(modules): %.ko :%.ko.stripped $(KEYRING_DEP) FORCE | |
197 | $(call if_changed,sign_ko_ko_stripped) | |
198 | ||
199 | $(patsubst %.ko,%.ko.stripped,$(modules)): %.ko.stripped :%.ko.unsigned FORCE | |
200 | $(call if_changed,sign_ko_stripped_ko_unsigned) | |
201 | ||
202 | targets += $(modules) | |
203 | endif | |
1da177e4 LT |
204 | |
205 | # Add FORCE to the prequisites of a target to force it to be always rebuilt. | |
206 | # --------------------------------------------------------------------------- | |
207 | ||
4f193362 | 208 | PHONY += FORCE |
1da177e4 LT |
209 | |
210 | FORCE: | |
211 | ||
212 | # Read all saved command lines and dependencies for the $(targets) we | |
213 | # may be building above, using $(if_changed{,_dep}). As an | |
214 | # optimization, we don't need to read them if the target does not | |
215 | # exist, we will rebuild anyway in that case. | |
216 | ||
217 | targets := $(wildcard $(sort $(targets))) | |
218 | cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) | |
219 | ||
220 | ifneq ($(cmd_files),) | |
221 | include $(cmd_files) | |
222 | endif | |
4f193362 PS |
223 | |
224 | ||
225 | # Declare the contents of the .PHONY variable as phony. We keep that | |
226 | # information in a variable se we can use it in if_changed and friends. | |
227 | ||
228 | .PHONY: $(PHONY) |