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1 # SPDX-License-Identifier: GPL-2.0
2 #
3 # Kbuild for top-level directory of the kernel
4 # This file takes care of the following:
5 # 1) Generate bounds.h
6 # 2) Generate timeconst.h
7 # 3) Generate asm-offsets.h (may need bounds.h and timeconst.h)
8 # 4) Check for missing system calls
9 # 5) Generate constants.py (may need bounds.h)
10
11 #####
12 # 1) Generate bounds.h
13
14 bounds-file := include/generated/bounds.h
15
16 always := $(bounds-file)
17 targets := kernel/bounds.s
18
19 $(bounds-file): kernel/bounds.s FORCE
20 $(call filechk,offsets,__LINUX_BOUNDS_H__)
21
22 #####
23 # 2) Generate timeconst.h
24
25 timeconst-file := include/generated/timeconst.h
26
27 targets += $(timeconst-file)
28
29 filechk_gentimeconst = echo $(CONFIG_HZ) | bc -q $<
30
31 $(timeconst-file): kernel/time/timeconst.bc FORCE
32 $(call filechk,gentimeconst)
33
34 #####
35 # 3) Generate asm-offsets.h
36 #
37
38 offsets-file := include/generated/asm-offsets.h
39
40 always += $(offsets-file)
41 targets += arch/$(SRCARCH)/kernel/asm-offsets.s
42
43 arch/$(SRCARCH)/kernel/asm-offsets.s: $(timeconst-file) $(bounds-file)
44
45 $(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE
46 $(call filechk,offsets,__ASM_OFFSETS_H__)
47
48 #####
49 # 4) Check for missing system calls
50 #
51
52 always += missing-syscalls
53 targets += missing-syscalls
54
55 quiet_cmd_syscalls = CALL $<
56 cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)
57
58 missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE
59 $(call cmd,syscalls)
60
61 #####
62 # 5) Generate constants for Python GDB integration
63 #
64
65 extra-$(CONFIG_GDB_SCRIPTS) += build_constants_py
66
67 build_constants_py: $(timeconst-file) $(bounds-file)
68 @$(MAKE) $(build)=scripts/gdb/linux $@
69
70 # Keep these three files during make clean
71 no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file)