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