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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 | |
1da177e4 LT |
18 | |
19 | # Step 3 is used to place certain information in the module's ELF | |
20 | # section, including information such as: | |
163d3fe6 | 21 | # Version magic (see include/linux/vermagic.h for full details) |
1da177e4 LT |
22 | # - Kernel release |
23 | # - SMP is CONFIG_SMP | |
4b950bb9 | 24 | # - PREEMPT is CONFIG_PREEMPT[_RT] |
1da177e4 LT |
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, | |
4696e295 | 33 | # where the CRC of each module is retrieved from the Module.symvers 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. | |
25985edc | 38 | # This is solely useful to speed up test compiles |
a721588d MY |
39 | |
40 | PHONY := __modpost | |
41 | __modpost: | |
1da177e4 | 42 | |
c955ccaf | 43 | include include/config/auto.conf |
8ec4b4ff | 44 | include scripts/Kbuild.include |
0d96fb20 | 45 | |
a721588d MY |
46 | kernelsymfile := $(objtree)/Module.symvers |
47 | modulesymfile := $(firstword $(KBUILD_EXTMOD))/Module.symvers | |
48 | ||
54b77847 JY |
49 | MODPOST = scripts/mod/modpost \ |
50 | $(if $(CONFIG_MODVERSIONS),-m) \ | |
51 | $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a) \ | |
52 | $(if $(KBUILD_EXTMOD),-i,-o) $(kernelsymfile) \ | |
53 | $(if $(KBUILD_EXTMOD),$(addprefix -e ,$(KBUILD_EXTRA_SYMBOLS))) \ | |
54 | $(if $(KBUILD_EXTMOD),-o $(modulesymfile)) \ | |
55 | $(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \ | |
56 | $(if $(CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS)$(KBUILD_NSDEPS),-N) \ | |
bff9c62b | 57 | $(if $(KBUILD_MODPOST_WARN),-w) |
a721588d MY |
58 | |
59 | ifdef MODPOST_VMLINUX | |
60 | ||
9b9a3f20 MY |
61 | quiet_cmd_modpost = MODPOST vmlinux.o |
62 | cmd_modpost = $(MODPOST) vmlinux.o | |
a721588d | 63 | |
9b9a3f20 | 64 | __modpost: |
a721588d MY |
65 | $(call cmd,modpost) |
66 | ||
67 | else | |
68 | ||
bff9c62b | 69 | MODPOST += $(subst -i,-n,$(filter -i,$(MAKEFLAGS))) -s -T - \ |
bc35d4bd | 70 | $(if $(KBUILD_NSDEPS),-d $(MODULES_NSDEPS)) |
1747269a MY |
71 | |
72 | ifeq ($(KBUILD_EXTMOD),) | |
73 | MODPOST += $(wildcard vmlinux) | |
74 | else | |
96d97f26 | 75 | |
fab546e6 | 76 | # set src + obj - they may be used in the modules's Makefile |
96d97f26 SR |
77 | obj := $(KBUILD_EXTMOD) |
78 | src := $(obj) | |
79 | ||
0d96fb20 RH |
80 | # Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS |
81 | include $(if $(wildcard $(KBUILD_EXTMOD)/Kbuild), \ | |
82 | $(KBUILD_EXTMOD)/Kbuild, $(KBUILD_EXTMOD)/Makefile) | |
83 | endif | |
84 | ||
a721588d | 85 | # find all modules listed in modules.order |
47801c97 | 86 | modules := $(sort $(shell cat $(MODORDER))) |
1da177e4 | 87 | |
9b9a3f20 MY |
88 | # Read out modules.order instead of expanding $(modules) to pass in modpost. |
89 | # Otherwise, allmodconfig would fail with "Argument list too long". | |
acf2a139 | 90 | quiet_cmd_modpost = MODPOST $(words $(modules)) modules |
47801c97 | 91 | cmd_modpost = sed 's/ko$$/o/' $(MODORDER) | $(MODPOST) |
1da177e4 | 92 | |
9b9a3f20 | 93 | __modpost: |
a721588d | 94 | $(call cmd,modpost) |
9b9a3f20 MY |
95 | ifneq ($(KBUILD_MODPOST_NOFINAL),1) |
96 | $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal | |
97 | endif | |
4f193362 | 98 | |
a721588d MY |
99 | endif |
100 | ||
4f193362 | 101 | .PHONY: $(PHONY) |