107 lines
3.4 KiB
Makefile
107 lines
3.4 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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# include/asm-generic contains a lot of files that are used
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# verbatim by several architectures.
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#
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# This Makefile generates arch/$(SRCARCH)/include/generated/(uapi/)/asm
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# headers from multiple sources:
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# - a small wrapper to include the corresponding asm-generic/*.h
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# is generated for each file listed as generic-y
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# - uapi/asm/unistd_*.h files listed as syscalls-y are generated from
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# syscall.tbl with the __NR_* macros
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# - Corresponding asm/syscall_table_*.h are generated from the same input
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PHONY := all
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all:
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src := $(srctree)/$(subst /generated,,$(obj))
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syscall_abis_32 += common,32
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syscall_abis_64 += common,64
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syscalltbl := $(srctree)/scripts/syscall.tbl
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syshdr-args := --emit-nr
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# let architectures override $(syscall_abis_%) and $(syscalltbl)
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-include $(srctree)/arch/$(SRCARCH)/kernel/Makefile.syscalls
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include $(srctree)/scripts/Kbuild.include
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-include $(kbuild-file)
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syshdr := $(srctree)/scripts/syscallhdr.sh
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systbl := $(srctree)/scripts/syscalltbl.sh
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# $(generic)/Kbuild lists mandatory-y. Exclude um since it is a special case.
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ifneq ($(SRCARCH),um)
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include $(srctree)/$(generic)/Kbuild
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endif
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redundant := $(filter $(mandatory-y) $(generated-y), $(generic-y))
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redundant += $(foreach f, $(generic-y), $(if $(wildcard $(src)/$(f)),$(f)))
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redundant := $(sort $(redundant))
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$(if $(redundant),\
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$(warning redundant generic-y found in $(src)/Kbuild: $(redundant)))
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# If arch does not implement mandatory headers, fallback to asm-generic ones.
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mandatory-y := $(filter-out $(generated-y), $(mandatory-y))
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generic-y += $(foreach f, $(mandatory-y), $(if $(wildcard $(src)/$(f)),,$(f)))
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generic-y := $(addprefix $(obj)/, $(generic-y))
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syscall-y := $(addprefix $(obj)/, $(syscall-y))
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generated-y := $(addprefix $(obj)/, $(generated-y))
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# Remove stale wrappers when the corresponding files are removed from generic-y
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old-headers := $(wildcard $(obj)/*.h)
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unwanted := $(filter-out $(generic-y) $(generated-y) $(syscall-y),$(old-headers))
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quiet_cmd_wrap = WRAP $@
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cmd_wrap = echo "\#include <asm-generic/$*.h>" > $@
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quiet_cmd_remove = REMOVE $(unwanted)
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cmd_remove = rm -f $(unwanted)
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quiet_cmd_syshdr = SYSHDR $@
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cmd_syshdr = $(CONFIG_SHELL) $(syshdr) \
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$(if $(syshdr-args-$*),$(syshdr-args-$*),$(syshdr-args)) \
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$(if $(syscall_compat),--prefix "compat$*_") \
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--abis $(subst $(space),$(comma),$(strip $(syscall_abis_$*))) \
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$< $@
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quiet_cmd_systbl = SYSTBL $@
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cmd_systbl = $(CONFIG_SHELL) $(systbl) \
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$(if $(systbl-args-$*),$(systbl-args-$*),$(systbl-args)) \
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--abis $(subst $(space),$(comma),$(strip $(syscall_abis_$*))) \
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$< $@
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all: $(generic-y) $(syscall-y)
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$(if $(unwanted),$(call cmd,remove))
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@:
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$(obj)/%.h: $(srctree)/$(generic)/%.h
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$(call cmd,wrap)
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$(obj)/unistd_%.h: $(syscalltbl) $(syshdr) FORCE
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$(call if_changed,syshdr)
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$(obj)/unistd_compat_%.h: syscall_compat:=1
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$(obj)/unistd_compat_%.h: $(syscalltbl) $(syshdr) FORCE
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$(call if_changed,syshdr)
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$(obj)/syscall_table_%.h: $(syscalltbl) $(systbl) FORCE
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$(call if_changed,systbl)
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targets := $(syscall-y)
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# Create output directory. Skip it if at least one old header exists
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# since we know the output directory already exists.
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ifeq ($(old-headers),)
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$(shell mkdir -p $(obj))
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endif
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PHONY += FORCE
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FORCE:
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existing-targets := $(wildcard $(sort $(targets)))
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-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
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.PHONY: $(PHONY)
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