137 lines
4.4 KiB
Makefile
137 lines
4.4 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
|
|
# ===========================================================================
|
|
# Module versions
|
|
# ===========================================================================
|
|
#
|
|
# Stage one of module building created the following:
|
|
# a) The individual .o files used for the module
|
|
# b) A <module>.o file which is the .o files above linked together
|
|
# c) A <module>.mod file, listing the name of the preliminary <module>.o file,
|
|
# plus all .o files
|
|
# d) modules.order, which lists all the modules
|
|
|
|
# Stage 2 is handled by this file and does the following
|
|
# 1) Find all modules listed in modules.order
|
|
# 2) modpost is then used to
|
|
# 3) create one <module>.mod.c file per module
|
|
# 4) create one Module.symvers file with CRC for all exported symbols
|
|
|
|
# Step 3 is used to place certain information in the module's ELF
|
|
# section, including information such as:
|
|
# Version magic (see include/linux/vermagic.h for full details)
|
|
# - Kernel release
|
|
# - SMP is CONFIG_SMP
|
|
# - PREEMPT is CONFIG_PREEMPT[_RT]
|
|
# - GCC Version
|
|
# Module info
|
|
# - Module version (MODULE_VERSION)
|
|
# - Module alias'es (MODULE_ALIAS)
|
|
# - Module license (MODULE_LICENSE)
|
|
# - See include/linux/module.h for more details
|
|
|
|
# Step 4 is solely used to allow module versioning in external modules,
|
|
# where the CRC of each module is retrieved from the Module.symvers file.
|
|
|
|
PHONY := __modpost
|
|
__modpost:
|
|
|
|
include include/config/auto.conf
|
|
include $(srctree)/scripts/Kbuild.include
|
|
|
|
modpost-args = \
|
|
$(if $(CONFIG_MODVERSIONS),-m) \
|
|
$(if $(CONFIG_MODULE_SRCVERSION_ALL),-a) \
|
|
$(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \
|
|
$(if $(KBUILD_NSDEPS),-d $(MODULES_NSDEPS)) \
|
|
$(if $(CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS)$(KBUILD_NSDEPS),-N) \
|
|
-o $@
|
|
|
|
# 'make -i -k' ignores compile errors, and builds as many modules as possible.
|
|
ifneq ($(findstring i,$(filter-out --%,$(MAKEFLAGS))),)
|
|
modpost-args += -n
|
|
endif
|
|
|
|
ifeq ($(KBUILD_EXTMOD),)
|
|
|
|
# Generate the list of in-tree objects in vmlinux
|
|
# ---------------------------------------------------------------------------
|
|
|
|
# This is used to retrieve symbol versions generated by genksyms.
|
|
ifdef CONFIG_MODVERSIONS
|
|
vmlinux.symvers Module.symvers: .vmlinux.objs
|
|
endif
|
|
|
|
# Ignore libgcc.a
|
|
# Some architectures do '$(CC) --print-libgcc-file-name' to borrow libgcc.a
|
|
# from the toolchain, but there is no EXPORT_SYMBOL in it.
|
|
|
|
quiet_cmd_vmlinux_objs = GEN $@
|
|
cmd_vmlinux_objs = \
|
|
for f in $(real-prereqs); do \
|
|
case $${f} in \
|
|
*libgcc.a) ;; \
|
|
*) $(AR) t $${f} ;; \
|
|
esac \
|
|
done > $@
|
|
|
|
targets += .vmlinux.objs
|
|
.vmlinux.objs: vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE
|
|
$(call if_changed,vmlinux_objs)
|
|
|
|
vmlinux.o-if-present := $(wildcard vmlinux.o)
|
|
output-symdump := vmlinux.symvers
|
|
|
|
ifdef KBUILD_MODULES
|
|
output-symdump := $(if $(vmlinux.o-if-present), Module.symvers, modules-only.symvers)
|
|
missing-input := $(filter-out $(vmlinux.o-if-present),vmlinux.o)
|
|
endif
|
|
|
|
else
|
|
|
|
# set src + obj - they may be used in the modules's Makefile
|
|
obj := $(KBUILD_EXTMOD)
|
|
src := $(obj)
|
|
|
|
# Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS
|
|
include $(or $(wildcard $(src)/Kbuild), $(src)/Makefile)
|
|
|
|
module.symvers-if-present := $(wildcard Module.symvers)
|
|
output-symdump := $(KBUILD_EXTMOD)/Module.symvers
|
|
missing-input := $(filter-out $(module.symvers-if-present), Module.symvers)
|
|
|
|
modpost-args += -e $(addprefix -i ,$(module.symvers-if-present) $(KBUILD_EXTRA_SYMBOLS))
|
|
|
|
endif # ($(KBUILD_EXTMOD),)
|
|
|
|
ifneq ($(KBUILD_MODPOST_WARN)$(missing-input),)
|
|
modpost-args += -w
|
|
endif
|
|
|
|
modorder-if-needed := $(if $(KBUILD_MODULES), $(MODORDER))
|
|
|
|
MODPOST = scripts/mod/modpost
|
|
|
|
# Read out modules.order to pass in modpost.
|
|
# Otherwise, allmodconfig would fail with "Argument list too long".
|
|
quiet_cmd_modpost = MODPOST $@
|
|
cmd_modpost = \
|
|
$(if $(missing-input), \
|
|
echo >&2 "WARNING: $(missing-input) is missing."; \
|
|
echo >&2 " Modules may not have dependencies or modversions."; \
|
|
echo >&2 " You may get many unresolved symbol warnings.";) \
|
|
sed 's/ko$$/o/' $(or $(modorder-if-needed), /dev/null) | $(MODPOST) $(modpost-args) $(vmlinux.o-if-present) -T -
|
|
|
|
targets += $(output-symdump)
|
|
$(output-symdump): $(modorder-if-needed) $(vmlinux.o-if-present) $(moudle.symvers-if-present) $(MODPOST) FORCE
|
|
$(call if_changed,modpost)
|
|
|
|
__modpost: $(output-symdump)
|
|
PHONY += FORCE
|
|
FORCE:
|
|
|
|
existing-targets := $(wildcard $(sort $(targets)))
|
|
|
|
-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
|
|
|
|
.PHONY: $(PHONY)
|