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1#
2# Kbuild for top-level directory of the kernel
3# This file takes care of the following:
1cdf25d7 4# 1) Generate bounds.h
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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
f197d75f 8# 5) Generate constants.py (may need bounds.h)
86feeaa8 9
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10#####
11# 1) Generate bounds.h
12
13bounds-file := include/generated/bounds.h
14
15always := $(bounds-file)
8a58e162 16targets := kernel/bounds.s
39664e2f 17
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18# We use internal kbuild rules to avoid the "is up to date" message from make
19kernel/bounds.s: kernel/bounds.c FORCE
20 $(Q)mkdir -p $(dir $@)
21 $(call if_changed_dep,cc_s_c)
22
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23$(obj)/$(bounds-file): kernel/bounds.s FORCE
24 $(call filechk,offsets,__LINUX_BOUNDS_H__)
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25
26#####
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27# 2) Generate timeconst.h
28
29timeconst-file := include/generated/timeconst.h
30
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31targets += $(timeconst-file)
32
33quiet_cmd_gentimeconst = GEN $@
34define cmd_gentimeconst
35 (echo $(CONFIG_HZ) | bc -q $< ) > $@
36endef
37define filechk_gentimeconst
38 (echo $(CONFIG_HZ) | bc -q $< )
39endef
40
41$(obj)/$(timeconst-file): kernel/time/timeconst.bc FORCE
42 $(call filechk,gentimeconst)
43
44#####
45# 3) Generate asm-offsets.h
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46#
47
559df2e0 48offsets-file := include/generated/asm-offsets.h
86feeaa8 49
1cdf25d7 50always += $(offsets-file)
6752ed90 51targets += arch/$(SRCARCH)/kernel/asm-offsets.s
1cdf25d7 52
86feeaa8 53# We use internal kbuild rules to avoid the "is up to date" message from make
1cdf25d7 54arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \
0a227985 55 $(obj)/$(timeconst-file) $(obj)/$(bounds-file) FORCE
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56 $(Q)mkdir -p $(dir $@)
57 $(call if_changed_dep,cc_s_c)
58
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59$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE
60 $(call filechk,offsets,__ASM_OFFSETS_H__)
86feeaa8 61
c53aeca0 62#####
0a227985 63# 4) Check for missing system calls
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64#
65
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66always += missing-syscalls
67targets += missing-syscalls
68
c53aeca0 69quiet_cmd_syscalls = CALL $<
44656fa0 70 cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)
c53aeca0 71
5f7efb4c 72missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE
c53aeca0 73 $(call cmd,syscalls)
1cdf25d7 74
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75#####
76# 5) Generate constants for Python GDB integration
77#
78
79extra-$(CONFIG_GDB_SCRIPTS) += build_constants_py
80
81build_constants_py: $(obj)/$(timeconst-file) $(obj)/$(bounds-file)
82 @$(MAKE) $(build)=scripts/gdb/linux $@
83
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84# Keep these three files during make clean
85no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file)