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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 timeconst.h
6 # 3) Generate asm-offsets.h (may need bounds.h and timeconst.h)
7 # 4) Check for missing system calls
8
9 # Default sed regexp - multiline due to syntax constraints
10 define sed-y
11 "/^->/{s:->#\(.*\):/* \1 */:; \
12 s:^->\([^ ]*\) [\$$#]*\([-0-9]*\) \(.*\):#define \1 \2 /* \3 */:; \
13 s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
14 s:->::; p;}"
15 endef
16
17 # Use filechk to avoid rebuilds when a header changes, but the resulting file
18 # does not
19 define filechk_offsets
20 (set -e; \
21 echo "#ifndef $2"; \
22 echo "#define $2"; \
23 echo "/*"; \
24 echo " * DO NOT MODIFY."; \
25 echo " *"; \
26 echo " * This file was generated by Kbuild"; \
27 echo " */"; \
28 echo ""; \
29 sed -ne $(sed-y); \
30 echo ""; \
31 echo "#endif" )
32 endef
33
34 #####
35 # 1) Generate bounds.h
36
37 bounds-file := include/generated/bounds.h
38
39 always := $(bounds-file)
40 targets := kernel/bounds.s
41
42 # We use internal kbuild rules to avoid the "is up to date" message from make
43 kernel/bounds.s: kernel/bounds.c FORCE
44 $(Q)mkdir -p $(dir $@)
45 $(call if_changed_dep,cc_s_c)
46
47 $(obj)/$(bounds-file): kernel/bounds.s FORCE
48 $(call filechk,offsets,__LINUX_BOUNDS_H__)
49
50 #####
51 # 2) Generate timeconst.h
52
53 timeconst-file := include/generated/timeconst.h
54
55 targets += $(timeconst-file)
56
57 quiet_cmd_gentimeconst = GEN $@
58 define cmd_gentimeconst
59 (echo $(CONFIG_HZ) | bc -q $< ) > $@
60 endef
61 define filechk_gentimeconst
62 (echo $(CONFIG_HZ) | bc -q $< )
63 endef
64
65 $(obj)/$(timeconst-file): kernel/time/timeconst.bc FORCE
66 $(call filechk,gentimeconst)
67
68 #####
69 # 3) Generate asm-offsets.h
70 #
71
72 offsets-file := include/generated/asm-offsets.h
73
74 always += $(offsets-file)
75 targets += arch/$(SRCARCH)/kernel/asm-offsets.s
76
77 # We use internal kbuild rules to avoid the "is up to date" message from make
78 arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \
79 $(obj)/$(timeconst-file) $(obj)/$(bounds-file) FORCE
80 $(Q)mkdir -p $(dir $@)
81 $(call if_changed_dep,cc_s_c)
82
83 $(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE
84 $(call filechk,offsets,__ASM_OFFSETS_H__)
85
86 #####
87 # 4) Check for missing system calls
88 #
89
90 always += missing-syscalls
91 targets += missing-syscalls
92
93 quiet_cmd_syscalls = CALL $<
94 cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)
95
96 missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE
97 $(call cmd,syscalls)
98
99 # Keep these three files during make clean
100 no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file)