| 1 | # SPDX-License-Identifier: GPL-2.0 |
| 2 | # include/asm-generic contains a lot of files that are used |
| 3 | # verbatim by several architectures. |
| 4 | # |
| 5 | # This Makefile generates arch/$(SRCARCH)/include/generated/(uapi/)/asm |
| 6 | # headers from multiple sources: |
| 7 | # - a small wrapper to include the corresponding asm-generic/*.h |
| 8 | # is generated for each file listed as generic-y |
| 9 | # - uapi/asm/unistd_*.h files listed as syscalls-y are generated from |
| 10 | # syscall.tbl with the __NR_* macros |
| 11 | # - Corresponding asm/syscall_table_*.h are generated from the same input |
| 12 | |
| 13 | PHONY := all |
| 14 | all: |
| 15 | |
| 16 | src := $(srctree)/$(subst /generated,,$(obj)) |
| 17 | |
| 18 | syscall_abis_32 += common,32 |
| 19 | syscall_abis_64 += common,64 |
| 20 | syscalltbl := $(srctree)/scripts/syscall.tbl |
| 21 | syshdr-args := --emit-nr |
| 22 | |
| 23 | # let architectures override $(syscall_abis_%) and $(syscalltbl) |
| 24 | -include $(srctree)/arch/$(SRCARCH)/kernel/Makefile.syscalls |
| 25 | include $(srctree)/scripts/Kbuild.include |
| 26 | -include $(kbuild-file) |
| 27 | |
| 28 | syshdr := $(srctree)/scripts/syscallhdr.sh |
| 29 | systbl := $(srctree)/scripts/syscalltbl.sh |
| 30 | |
| 31 | # $(generic)/Kbuild lists mandatory-y. Exclude um since it is a special case. |
| 32 | ifneq ($(SRCARCH),um) |
| 33 | include $(srctree)/$(generic)/Kbuild |
| 34 | endif |
| 35 | |
| 36 | redundant := $(filter $(mandatory-y) $(generated-y), $(generic-y)) |
| 37 | redundant += $(foreach f, $(generic-y), $(if $(wildcard $(src)/$(f)),$(f))) |
| 38 | redundant := $(sort $(redundant)) |
| 39 | $(if $(redundant),\ |
| 40 | $(warning redundant generic-y found in $(src)/Kbuild: $(redundant))) |
| 41 | |
| 42 | # If arch does not implement mandatory headers, fallback to asm-generic ones. |
| 43 | mandatory-y := $(filter-out $(generated-y), $(mandatory-y)) |
| 44 | generic-y += $(foreach f, $(mandatory-y), $(if $(wildcard $(src)/$(f)),,$(f))) |
| 45 | |
| 46 | generic-y := $(addprefix $(obj)/, $(generic-y)) |
| 47 | syscall-y := $(addprefix $(obj)/, $(syscall-y)) |
| 48 | generated-y := $(addprefix $(obj)/, $(generated-y)) |
| 49 | |
| 50 | # Remove stale wrappers when the corresponding files are removed from generic-y |
| 51 | old-headers := $(wildcard $(obj)/*.h) |
| 52 | unwanted := $(filter-out $(generic-y) $(generated-y) $(syscall-y),$(old-headers)) |
| 53 | |
| 54 | quiet_cmd_wrap = WRAP $@ |
| 55 | cmd_wrap = echo "\#include <asm-generic/$*.h>" > $@ |
| 56 | |
| 57 | quiet_cmd_remove = REMOVE $(unwanted) |
| 58 | cmd_remove = rm -f $(unwanted) |
| 59 | |
| 60 | quiet_cmd_syshdr = SYSHDR $@ |
| 61 | cmd_syshdr = $(CONFIG_SHELL) $(syshdr) \ |
| 62 | $(if $(syshdr-args-$*),$(syshdr-args-$*),$(syshdr-args)) \ |
| 63 | $(if $(syscall_compat),--prefix "compat$*_") \ |
| 64 | --abis $(subst $(space),$(comma),$(strip $(syscall_abis_$*))) \ |
| 65 | $< $@ |
| 66 | |
| 67 | quiet_cmd_systbl = SYSTBL $@ |
| 68 | cmd_systbl = $(CONFIG_SHELL) $(systbl) \ |
| 69 | $(if $(systbl-args-$*),$(systbl-args-$*),$(systbl-args)) \ |
| 70 | --abis $(subst $(space),$(comma),$(strip $(syscall_abis_$*))) \ |
| 71 | $< $@ |
| 72 | |
| 73 | all: $(generic-y) $(syscall-y) |
| 74 | $(if $(unwanted),$(call cmd,remove)) |
| 75 | @: |
| 76 | |
| 77 | $(obj)/%.h: $(srctree)/$(generic)/%.h |
| 78 | $(call cmd,wrap) |
| 79 | |
| 80 | $(obj)/unistd_%.h: $(syscalltbl) $(syshdr) FORCE |
| 81 | $(call if_changed,syshdr) |
| 82 | |
| 83 | $(obj)/unistd_compat_%.h: syscall_compat:=1 |
| 84 | $(obj)/unistd_compat_%.h: $(syscalltbl) $(syshdr) FORCE |
| 85 | $(call if_changed,syshdr) |
| 86 | |
| 87 | $(obj)/syscall_table_%.h: $(syscalltbl) $(systbl) FORCE |
| 88 | $(call if_changed,systbl) |
| 89 | |
| 90 | targets := $(syscall-y) |
| 91 | |
| 92 | # Create output directory. Skip it if at least one old header exists |
| 93 | # since we know the output directory already exists. |
| 94 | ifeq ($(old-headers),) |
| 95 | $(shell mkdir -p $(obj)) |
| 96 | endif |
| 97 | |
| 98 | PHONY += FORCE |
| 99 | |
| 100 | FORCE: |
| 101 | |
| 102 | existing-targets := $(wildcard $(sort $(targets))) |
| 103 | |
| 104 | -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) |
| 105 | |
| 106 | .PHONY: $(PHONY) |