1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 # ============================================ 2 # ===========================================================================
3 # Module versions 3 # Module versions
4 # ============================================ 4 # ===========================================================================
5 # 5 #
6 # Stage one of module building created the fol 6 # Stage one of module building created the following:
7 # a) The individual .o files used for the modu 7 # a) The individual .o files used for the module
8 # b) A <module>.o file which is the .o files a 8 # b) A <module>.o file which is the .o files above linked together
9 # c) A <module>.mod file, listing the name of 9 # c) A <module>.mod file, listing the name of the preliminary <module>.o file,
10 # plus all .o files 10 # plus all .o files
11 # d) modules.order, which lists all the module 11 # d) modules.order, which lists all the modules
12 12
13 # Stage 2 is handled by this file and does the 13 # Stage 2 is handled by this file and does the following
14 # 1) Find all modules listed in modules.order 14 # 1) Find all modules listed in modules.order
15 # 2) modpost is then used to 15 # 2) modpost is then used to
16 # 3) create one <module>.mod.c file per modul !! 16 # 3) create one <module>.mod.c file pr. module
17 # 4) create one Module.symvers file with CRC 17 # 4) create one Module.symvers file with CRC for all exported symbols
18 18
19 # Step 3 is used to place certain information 19 # Step 3 is used to place certain information in the module's ELF
20 # section, including information such as: 20 # section, including information such as:
21 # Version magic (see include/linux/vermagic. 21 # Version magic (see include/linux/vermagic.h for full details)
22 # - Kernel release 22 # - Kernel release
23 # - SMP is CONFIG_SMP 23 # - SMP is CONFIG_SMP
24 # - PREEMPT is CONFIG_PREEMPT[_RT] 24 # - PREEMPT is CONFIG_PREEMPT[_RT]
25 # - GCC Version 25 # - GCC Version
26 # Module info 26 # Module info
27 # - Module version (MODULE_VERSION) 27 # - Module version (MODULE_VERSION)
28 # - Module alias'es (MODULE_ALIAS) 28 # - Module alias'es (MODULE_ALIAS)
29 # - Module license (MODULE_LICENSE) 29 # - Module license (MODULE_LICENSE)
30 # - See include/linux/module.h for more de 30 # - See include/linux/module.h for more details
31 31
32 # Step 4 is solely used to allow module versio 32 # Step 4 is solely used to allow module versioning in external modules,
33 # where the CRC of each module is retrieved fr 33 # where the CRC of each module is retrieved from the Module.symvers file.
34 34
>> 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 useful to speed up test compiles
>> 39
35 PHONY := __modpost 40 PHONY := __modpost
36 __modpost: 41 __modpost:
37 42
38 include include/config/auto.conf 43 include include/config/auto.conf
39 include $(srctree)/scripts/Kbuild.include !! 44 include scripts/Kbuild.include
40 <<
41 MODPOST = scripts/mod/modpost <<
42 45
43 modpost-args = !! 46 kernelsymfile := $(objtree)/Module.symvers
44 $(if $(CONFIG_MODULES),-M) !! 47 modulesymfile := $(firstword $(KBUILD_EXTMOD))/Module.symvers
45 $(if $(CONFIG_MODVERSIONS),-m) <<
46 $(if $(CONFIG_MODULE_SRCVERSION_ALL),- <<
47 $(if $(CONFIG_SECTION_MISMATCH_WARN_ON <<
48 $(if $(KBUILD_MODPOST_WARN),-w) <<
49 $(if $(KBUILD_NSDEPS),-d $(MODULES_NSD <<
50 $(if $(CONFIG_MODULE_ALLOW_MISSING_NAM <<
51 $(if $(findstring 1, $(KBUILD_EXTRA_WA <<
52 -o $@ <<
53 <<
54 modpost-deps := $(MODPOST) <<
55 <<
56 # 'make -i -k' ignores compile errors, and bui <<
57 ifneq ($(findstring i,$(filter-out --%,$(MAKEF <<
58 modpost-args += -n <<
59 endif <<
60 <<
61 # Read out modules.order to pass in modpost. <<
62 # Otherwise, allmodconfig would fail with "Arg <<
63 ifdef KBUILD_MODULES <<
64 modpost-args += -T $(MODORDER) <<
65 modpost-deps += $(MODORDER) <<
66 endif <<
67 48
68 ifeq ($(KBUILD_EXTMOD),) !! 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),-I $(modulesymfile)) \
>> 54 $(if $(KBUILD_EXTMOD),$(addprefix -e ,$(KBUILD_EXTRA_SYMBOLS))) \
>> 55 $(if $(KBUILD_EXTMOD),-o $(modulesymfile)) \
>> 56 $(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \
>> 57 $(if $(KBUILD_MODPOST_WARN),-w) \
>> 58 $(if $(filter nsdeps,$(MAKECMDGOALS)),-d)
69 59
70 # Generate the list of in-tree objects in vmli !! 60 ifdef MODPOST_VMLINUX
71 # -------------------------------------------- <<
72 61
73 # This is used to retrieve symbol versions gen !! 62 quiet_cmd_modpost = MODPOST vmlinux.o
74 ifdef CONFIG_MODVERSIONS !! 63 cmd_modpost = $(MODPOST) vmlinux.o
75 vmlinux.symvers Module.symvers: .vmlinux.objs <<
76 endif <<
77 64
78 # Ignore libgcc.a !! 65 __modpost:
79 # Some architectures do '$(CC) --print-libgcc- !! 66 $(call cmd,modpost)
80 # from the toolchain, but there is no EXPORT_S <<
81 <<
82 quiet_cmd_vmlinux_objs = GEN $@ <<
83 cmd_vmlinux_objs = \ <<
84 for f in $(real-prereqs); do \ <<
85 case $${f} in \ <<
86 *libgcc.a) ;; \ <<
87 *) $(AR) t $${f} ;; \ <<
88 esac \ <<
89 done > $@ <<
90 <<
91 targets += .vmlinux.objs <<
92 .vmlinux.objs: vmlinux.a $(KBUILD_VMLINUX_LIBS <<
93 $(call if_changed,vmlinux_objs) <<
94 <<
95 ifdef CONFIG_TRIM_UNUSED_KSYMS <<
96 ksym-wl := $(CONFIG_UNUSED_KSYMS_WHITELIST) <<
97 ksym-wl := $(if $(filter-out /%, $(ksym-wl)),$ <<
98 modpost-args += -t $(addprefix -u , $(ksym-wl) <<
99 modpost-deps += $(ksym-wl) <<
100 endif <<
101 67
102 ifeq ($(wildcard vmlinux.o),) <<
103 missing-input := vmlinux.o <<
104 output-symdump := modules-only.symvers <<
105 else 68 else
106 modpost-args += vmlinux.o <<
107 modpost-deps += vmlinux.o <<
108 output-symdump := $(if $(KBUILD_MODULES), Modu <<
109 endif <<
110 69
111 else !! 70 # When building external modules load the Kbuild file to retrieve EXTRA_SYMBOLS info
>> 71 ifneq ($(KBUILD_EXTMOD),)
112 72
113 # set src + obj - they may be used in the modu !! 73 # set src + obj - they may be used when building the .mod.c file
114 obj := $(KBUILD_EXTMOD) 74 obj := $(KBUILD_EXTMOD)
115 src := $(if $(VPATH),$(VPATH)/)$(obj) !! 75 src := $(obj)
116 76
117 # Include the module's Makefile to find KBUILD 77 # Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS
118 include $(kbuild-file) !! 78 include $(if $(wildcard $(src)/Kbuild), $(src)/Kbuild, $(src)/Makefile)
119 <<
120 output-symdump := $(KBUILD_EXTMOD)/Module.symv <<
121 <<
122 ifeq ($(wildcard Module.symvers),) <<
123 missing-input := Module.symvers <<
124 else <<
125 modpost-args += -i Module.symvers <<
126 modpost-deps += Module.symvers <<
127 endif 79 endif
128 80
129 modpost-args += -e $(addprefix -i , $(KBUILD_E !! 81 MODPOST += $(subst -i,-n,$(filter -i,$(MAKEFLAGS))) -s -T - $(wildcard vmlinux)
130 82
131 endif # ($(KBUILD_EXTMOD),) !! 83 # find all modules listed in modules.order
>> 84 modules := $(sort $(shell cat $(MODORDER)))
132 85
133 quiet_cmd_modpost = MODPOST $@ !! 86 # Read out modules.order instead of expanding $(modules) to pass in modpost.
134 cmd_modpost = \ !! 87 # Otherwise, allmodconfig would fail with "Argument list too long".
135 $(if $(missing-input), \ !! 88 quiet_cmd_modpost = MODPOST $(words $(modules)) modules
136 echo >&2 "WARNING: $(missing-i !! 89 cmd_modpost = sed 's/ko$$/o/' $(MODORDER) | $(MODPOST)
137 echo >&2 " Modules may <<
138 echo >&2 " You may get <<
139 echo >&2 " You can set <<
140 echo >&2 " if you want <<
141 $(MODPOST) $(modpost-args) <<
142 <<
143 targets += $(output-symdump) <<
144 $(output-symdump): $(modpost-deps) FORCE <<
145 $(call if_changed,modpost) <<
146 <<
147 __modpost: $(output-symdump) <<
148 PHONY += FORCE <<
149 FORCE: <<
150 90
151 existing-targets := $(wildcard $(sort $(target !! 91 __modpost:
>> 92 @$(kecho) ' Building modules, stage 2.'
>> 93 $(call cmd,modpost)
>> 94 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
>> 95 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
>> 96 endif
152 97
153 -include $(foreach f,$(existing-targets),$(dir !! 98 nsdeps: __modpost
>> 99
>> 100 endif
154 101
155 .PHONY: $(PHONY) 102 .PHONY: $(PHONY)
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