xref: /linux/Kbuild (revision 39664e2f) 
1#
2# Kbuild for top-level directory of the kernel
3# This file takes care of the following:
4# 1) Generate bounds.h
5# 2) Generate asm-offsets.h (may need bounds.h)
6# 3) Check for missing system calls
7
8# Default sed regexp - multiline due to syntax constraints
9define sed-y
10	"/^->/{s:->#\(.*\):/* \1 */:; \
11	s:^->\([^ ]*\) [\$$#]*\([-0-9]*\) \(.*\):#define \1 \2 /* \3 */:; \
12	s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
13	s:->::; p;}"
14endef
15
16quiet_cmd_offsets = GEN     $@
17define cmd_offsets
18	(set -e; \
19	 echo "#ifndef $2"; \
20	 echo "#define $2"; \
21	 echo "/*"; \
22	 echo " * DO NOT MODIFY."; \
23	 echo " *"; \
24	 echo " * This file was generated by Kbuild"; \
25	 echo " *"; \
26	 echo " */"; \
27	 echo ""; \
28	 sed -ne $(sed-y) $<; \
29	 echo ""; \
30	 echo "#endif" ) > $@
31endef
32
33#####
34# 1) Generate bounds.h
35
36bounds-file := include/generated/bounds.h
37
38always  := $(bounds-file)
39targets := $(bounds-file) kernel/bounds.s
40
41# We use internal kbuild rules to avoid the "is up to date" message from make
42kernel/bounds.s: kernel/bounds.c FORCE
43	$(Q)mkdir -p $(dir $@)
44	$(call if_changed_dep,cc_s_c)
45
46$(obj)/$(bounds-file): kernel/bounds.s Kbuild
47	$(Q)mkdir -p $(dir $@)
48	$(call cmd,offsets,__LINUX_BOUNDS_H__)
49
50#####
51# 2) Generate asm-offsets.h
52#
53
54offsets-file := include/generated/asm-offsets.h
55
56always  += $(offsets-file)
57targets += $(offsets-file)
58targets += arch/$(SRCARCH)/kernel/asm-offsets.s
59
60# We use internal kbuild rules to avoid the "is up to date" message from make
61arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \
62                                      $(obj)/$(bounds-file) FORCE
63	$(Q)mkdir -p $(dir $@)
64	$(call if_changed_dep,cc_s_c)
65
66$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s Kbuild
67	$(call cmd,offsets,__ASM_OFFSETS_H__)
68
69#####
70# 3) Check for missing system calls
71#
72
73always += missing-syscalls
74targets += missing-syscalls
75
76quiet_cmd_syscalls = CALL    $<
77      cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)
78
79missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE
80	$(call cmd,syscalls)
81
82# Keep these two files during make clean
83no-clean-files := $(bounds-file) $(offsets-file)
84