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