xref: /openbmc/linux/Kbuild (revision 8b036556) 
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	 sed -ne $(sed-y) $<; \
28	 echo ""; \
29	 echo "#endif" ) > $@
30endef
31
32#####
33# 1) Generate bounds.h
34
35bounds-file := include/generated/bounds.h
36
37always  := $(bounds-file)
38targets := $(bounds-file) kernel/bounds.s
39
40# We use internal kbuild rules to avoid the "is up to date" message from make
41kernel/bounds.s: kernel/bounds.c FORCE
42	$(Q)mkdir -p $(dir $@)
43	$(call if_changed_dep,cc_s_c)
44
45$(obj)/$(bounds-file): kernel/bounds.s Kbuild
46	$(Q)mkdir -p $(dir $@)
47	$(call cmd,offsets,__LINUX_BOUNDS_H__)
48
49#####
50# 2) Generate asm-offsets.h
51#
52
53offsets-file := include/generated/asm-offsets.h
54
55always  += $(offsets-file)
56targets += $(offsets-file)
57targets += arch/$(SRCARCH)/kernel/asm-offsets.s
58
59# We use internal kbuild rules to avoid the "is up to date" message from make
60arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \
61                                      $(obj)/$(bounds-file) FORCE
62	$(Q)mkdir -p $(dir $@)
63	$(call if_changed_dep,cc_s_c)
64
65$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s Kbuild
66	$(call cmd,offsets,__ASM_OFFSETS_H__)
67
68#####
69# 3) Check for missing system calls
70#
71
72always += missing-syscalls
73targets += missing-syscalls
74
75quiet_cmd_syscalls = CALL    $<
76      cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)
77
78missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE
79	$(call cmd,syscalls)
80
81# Keep these two files during make clean
82no-clean-files := $(bounds-file) $(offsets-file)
83