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1# SPDX-License-Identifier: GPL-2.0
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
8# b) A <module>.o file which is the .o files above linked together
9# c) A <module>.mod file, listing the name of the preliminary <module>.o file,
10# plus all .o files
11# d) modules.order, which lists all the modules
12
13# Stage 2 is handled by this file and does the following
14# 1) Find all modules listed in modules.order
15# 2) modpost is then used to
16# 3) create one <module>.mod.c file per module
17# 4) create one Module.symvers file with CRC for all exported symbols
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/linux/vermagic.h for full details)
22# - Kernel release
23# - SMP is CONFIG_SMP
24# - PREEMPT is CONFIG_PREEMPT[_RT]
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,
33# where the CRC of each module is retrieved from the Module.symvers file.
34
35PHONY := __modpost
36__modpost:
37
38include include/config/auto.conf
39include $(srctree)/scripts/Kbuild.include
40
41MODPOST = scripts/mod/modpost
42
43modpost-args = \
44 $(if $(CONFIG_MODULES),-M) \
45 $(if $(CONFIG_MODVERSIONS),-m) \
46 $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a) \
47 $(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \
48 $(if $(KBUILD_MODPOST_WARN),-w) \
49 $(if $(KBUILD_NSDEPS),-d $(MODULES_NSDEPS)) \
50 $(if $(CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS)$(KBUILD_NSDEPS),-N) \
51 $(if $(findstring 1, $(KBUILD_EXTRA_WARN)),-W) \
52 -o $@
53
54modpost-deps := $(MODPOST)
55
56# 'make -i -k' ignores compile errors, and builds as many modules as possible.
57ifneq ($(findstring i,$(filter-out --%,$(MAKEFLAGS))),)
58modpost-args += -n
59endif
60
61# Read out modules.order to pass in modpost.
62# Otherwise, allmodconfig would fail with "Argument list too long".
63ifdef KBUILD_MODULES
64modpost-args += -T $(MODORDER)
65modpost-deps += $(MODORDER)
66endif
67
68ifeq ($(KBUILD_EXTMOD),)
69
70# Generate the list of in-tree objects in vmlinux
71# ---------------------------------------------------------------------------
72
73# This is used to retrieve symbol versions generated by genksyms.
74ifdef CONFIG_MODVERSIONS
75vmlinux.symvers Module.symvers: .vmlinux.objs
76endif
77
78# Ignore libgcc.a
79# Some architectures do '$(CC) --print-libgcc-file-name' to borrow libgcc.a
80# from the toolchain, but there is no EXPORT_SYMBOL in it.
81
82quiet_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
91targets += .vmlinux.objs
92.vmlinux.objs: vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE
93 $(call if_changed,vmlinux_objs)
94
95ifdef CONFIG_TRIM_UNUSED_KSYMS
96ksym-wl := $(CONFIG_UNUSED_KSYMS_WHITELIST)
97ksym-wl := $(if $(filter-out /%, $(ksym-wl)),$(srctree)/)$(ksym-wl)
98modpost-args += -t $(addprefix -u , $(ksym-wl))
99modpost-deps += $(ksym-wl)
100endif
101
102ifeq ($(wildcard vmlinux.o),)
103missing-input := vmlinux.o
104output-symdump := modules-only.symvers
105else
106modpost-args += vmlinux.o
107modpost-deps += vmlinux.o
108output-symdump := $(if $(KBUILD_MODULES), Module.symvers, vmlinux.symvers)
109endif
110
111else
112
113# set src + obj - they may be used in the modules's Makefile
114obj := $(KBUILD_EXTMOD)
115src := $(obj)
116
117# Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS
118include $(kbuild-file)
119
120output-symdump := $(KBUILD_EXTMOD)/Module.symvers
121
122ifeq ($(wildcard Module.symvers),)
123missing-input := Module.symvers
124else
125modpost-args += -i Module.symvers
126modpost-deps += Module.symvers
127endif
128
129modpost-args += -e $(addprefix -i , $(KBUILD_EXTRA_SYMBOLS))
130
131endif # ($(KBUILD_EXTMOD),)
132
133quiet_cmd_modpost = MODPOST $@
134 cmd_modpost = \
135 $(if $(missing-input), \
136 echo >&2 "WARNING: $(missing-input) is missing."; \
137 echo >&2 " Modules may not have dependencies or modversions."; \
138 echo >&2 " You may get many unresolved symbol errors."; \
139 echo >&2 " You can set KBUILD_MODPOST_WARN=1 to turn errors into warning"; \
140 echo >&2 " if you want to proceed at your own risk.";) \
141 $(MODPOST) $(modpost-args)
142
143targets += $(output-symdump)
144$(output-symdump): $(modpost-deps) FORCE
145 $(call if_changed,modpost)
146
147__modpost: $(output-symdump)
148PHONY += FORCE
149FORCE:
150
151existing-targets := $(wildcard $(sort $(targets)))
152
153-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
154
155.PHONY: $(PHONY)
1# SPDX-License-Identifier: GPL-2.0
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
8# b) A <module>.o file which is the .o files above linked together
9# c) A <module>.mod file, listing the name of the preliminary <module>.o file,
10# plus all .o files
11# d) modules.order, which lists all the modules
12
13# Stage 2 is handled by this file and does the following
14# 1) Find all modules listed in modules.order
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
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/linux/vermagic.h for full details)
22# - Kernel release
23# - SMP is CONFIG_SMP
24# - PREEMPT is CONFIG_PREEMPT[_RT]
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,
33# where the CRC of each module is retrieved from the Module.symvers file.
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
40PHONY := __modpost
41__modpost:
42
43include include/config/auto.conf
44include scripts/Kbuild.include
45
46MODPOST = scripts/mod/modpost \
47 $(if $(CONFIG_MODVERSIONS),-m) \
48 $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a) \
49 $(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \
50 $(if $(KBUILD_MODPOST_WARN),-w) \
51 -o $@
52
53ifdef MODPOST_VMLINUX
54
55quiet_cmd_modpost = MODPOST $@
56 cmd_modpost = $(MODPOST) $<
57
58vmlinux.symvers: __KEEPMAKEFILEO__B.o
59 $(call cmd,modpost)
60
61__modpost: vmlinux.symvers
62
63else
64
65ifeq ($(KBUILD_EXTMOD),)
66
67input-symdump := vmlinux.symvers
68output-symdump := Module.symvers
69
70else
71
72# set src + obj - they may be used in the modules's Makefile
73obj := $(KBUILD_EXTMOD)
74src := $(obj)
75
76# Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS
77include $(if $(wildcard $(KBUILD_EXTMOD)/Kbuild), \
78 $(KBUILD_EXTMOD)/Kbuild, $(KBUILD_EXTMOD)/Makefile)
79
80# modpost option for external modules
81MODPOST += -e
82
83input-symdump := Module.symvers $(KBUILD_EXTRA_SYMBOLS)
84output-symdump := $(KBUILD_EXTMOD)/Module.symvers
85
86endif
87
88# modpost options for modules (both in-kernel and external)
89MODPOST += \
90 $(addprefix -i ,$(wildcard $(input-symdump))) \
91 $(if $(KBUILD_NSDEPS),-d $(MODULES_NSDEPS)) \
92 $(if $(CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS)$(KBUILD_NSDEPS),-N)
93
94# 'make -i -k' ignores compile errors, and builds as many modules as possible.
95ifneq ($(findstring i,$(filter-out --%,$(MAKEFLAGS))),)
96MODPOST += -n
97endif
98
99# Clear VPATH to not search for *.symvers in $(srctree). Check only $(objtree).
100VPATH :=
101$(input-symdump):
102 @echo >&2 'WARNING: Symbol version dump "$@" is missing.'
103 @echo >&2 ' Modules may not have dependencies or modversions.'
104
105# Read out modules.order to pass in modpost.
106# Otherwise, allmodconfig would fail with "Argument list too long".
107quiet_cmd_modpost = MODPOST $@
108 cmd_modpost = sed 's/ko$$/o/' $< | $(MODPOST) -T -
109
110$(output-symdump): $(MODORDER) $(input-symdump) FORCE
111 $(call if_changed,modpost)
112
113targets += $(output-symdump)
114
115__modpost: $(output-symdump)
116ifneq ($(KBUILD_MODPOST_NOFINAL),1)
117 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
118endif
119
120PHONY += FORCE
121FORCE:
122
123existing-targets := $(wildcard $(sort $(targets)))
124
125-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
126
127endif
128
129.PHONY: $(PHONY)