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_MODVERSIONS),-m)							\
 45	$(if $(CONFIG_MODULE_SRCVERSION_ALL),-a)					\
 46	$(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E)					\
 47	$(if $(KBUILD_MODPOST_WARN),-w)							\
 48	$(if $(KBUILD_NSDEPS),-d $(MODULES_NSDEPS))					\
 49	$(if $(CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS)$(KBUILD_NSDEPS),-N)	\
 50	-o $@
 51
 52modpost-deps := $(MODPOST)
 53
 54# 'make -i -k' ignores compile errors, and builds as many modules as possible.
 55ifneq ($(findstring i,$(filter-out --%,$(MAKEFLAGS))),)
 56modpost-args += -n
 57endif
 58
 59# Read out modules.order to pass in modpost.
 60# Otherwise, allmodconfig would fail with "Argument list too long".
 61ifdef KBUILD_MODULES
 62modpost-args += -T $(MODORDER)
 63modpost-deps += $(MODORDER)
 64endif
 
 
 
 
 65
 66ifeq ($(KBUILD_EXTMOD),)
 67
 68# Generate the list of in-tree objects in vmlinux
 69# ---------------------------------------------------------------------------
 70
 71# This is used to retrieve symbol versions generated by genksyms.
 72ifdef CONFIG_MODVERSIONS
 73vmlinux.symvers Module.symvers: .vmlinux.objs
 74endif
 75
 76# Ignore libgcc.a
 77# Some architectures do '$(CC) --print-libgcc-file-name' to borrow libgcc.a
 78# from the toolchain, but there is no EXPORT_SYMBOL in it.
 79
 80quiet_cmd_vmlinux_objs = GEN     $@
 81      cmd_vmlinux_objs =		\
 82	for f in $(real-prereqs); do	\
 83		case $${f} in		\
 84		*libgcc.a) ;;		\
 85		*) $(AR) t $${f} ;;	\
 86		esac			\
 87	done > $@
 88
 89targets += .vmlinux.objs
 90.vmlinux.objs: vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE
 91	$(call if_changed,vmlinux_objs)
 92
 93ifeq ($(wildcard vmlinux.o),)
 94missing-input := vmlinux.o
 95output-symdump := modules-only.symvers
 96else
 97modpost-args += vmlinux.o
 98modpost-deps += vmlinux.o
 99output-symdump := $(if $(KBUILD_MODULES), Module.symvers, vmlinux.symvers)
100endif
101
102else
 
103
104# set src + obj - they may be used in the modules's Makefile
105obj := $(KBUILD_EXTMOD)
106src := $(obj)
107
108# Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS
109include $(kbuild-file)
110
111output-symdump := $(KBUILD_EXTMOD)/Module.symvers
112
113ifeq ($(wildcard Module.symvers),)
114missing-input := Module.symvers
115else
116modpost-args += -i Module.symvers
117modpost-deps += Module.symvers
118endif
119
120modpost-args += -e $(addprefix -i , $(KBUILD_EXTRA_SYMBOLS))
121
122endif # ($(KBUILD_EXTMOD),)
 
123
124ifneq ($(missing-input),)
125modpost-args += -w
126endif
 
127
128quiet_cmd_modpost = MODPOST $@
129      cmd_modpost = \
130	$(if $(missing-input), \
131		echo >&2 "WARNING: $(missing-input) is missing."; \
132		echo >&2 "         Modules may not have dependencies or modversions."; \
133		echo >&2 "         You may get many unresolved symbol warnings.";) \
134	$(MODPOST) $(modpost-args)
135
136targets += $(output-symdump)
137$(output-symdump): $(modpost-deps) FORCE
138	$(call if_changed,modpost)
139
140__modpost: $(output-symdump)
141PHONY += FORCE
142FORCE:
143
144existing-targets := $(wildcard $(sort $(targets)))
145
146-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
147
148.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
 46kernelsymfile := $(objtree)/Module.symvers
 47modulesymfile := $(firstword $(KBUILD_EXTMOD))/Module.symvers
 
 
 
 
 
 
 
 
 
 
 
 
 
 48
 49MODPOST = 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)
 59
 60ifdef MODPOST_VMLINUX
 61
 62quiet_cmd_modpost = MODPOST vmlinux.o
 63      cmd_modpost = $(MODPOST) vmlinux.o
 64
 65__modpost:
 66	$(call cmd,modpost)
 
 
 67
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 68else
 
 
 
 
 69
 70# When building external modules load the Kbuild file to retrieve EXTRA_SYMBOLS info
 71ifneq ($(KBUILD_EXTMOD),)
 72
 73# set src + obj - they may be used when building the .mod.c file
 74obj := $(KBUILD_EXTMOD)
 75src := $(obj)
 76
 77# Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS
 78include $(if $(wildcard $(KBUILD_EXTMOD)/Kbuild), \
 79             $(KBUILD_EXTMOD)/Kbuild, $(KBUILD_EXTMOD)/Makefile)
 
 
 
 
 
 
 
 80endif
 81
 82MODPOST += $(subst -i,-n,$(filter -i,$(MAKEFLAGS))) -s -T - $(wildcard vmlinux)
 83
 84# find all modules listed in modules.order
 85modules := $(sort $(shell cat $(MODORDER)))
 86
 87# Read out modules.order instead of expanding $(modules) to pass in modpost.
 88# Otherwise, allmodconfig would fail with "Argument list too long".
 89quiet_cmd_modpost = MODPOST $(words $(modules)) modules
 90      cmd_modpost = sed 's/ko$$/o/' $(MODORDER) | $(MODPOST)
 91
 92__modpost:
 93	@$(kecho) '  Building modules, stage 2.'
 94	$(call cmd,modpost)
 95ifneq ($(KBUILD_MODPOST_NOFINAL),1)
 96	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
 97endif
 
 
 
 
 
 
 
 
 
 98
 99nsdeps: __modpost
100
101endif
102
103.PHONY: $(PHONY)