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Commit | Line | Data |
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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) |