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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 | # 5) Generate constants.py (may need bounds.h) | |
9 | ||
10 | # Default sed regexp - multiline due to syntax constraints | |
11 | define sed-y | |
12 | "/^->/{s:->#\(.*\):/* \1 */:; \ | |
13 | s:^->\([^ ]*\) [\$$#]*\([-0-9]*\) \(.*\):#define \1 \2 /* \3 */:; \ | |
14 | s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \ | |
15 | s:->::; p;}" | |
16 | endef | |
17 | ||
18 | # Use filechk to avoid rebuilds when a header changes, but the resulting file | |
19 | # does not | |
20 | define filechk_offsets | |
21 | (set -e; \ | |
22 | echo "#ifndef $2"; \ | |
23 | echo "#define $2"; \ | |
24 | echo "/*"; \ | |
25 | echo " * DO NOT MODIFY."; \ | |
26 | echo " *"; \ | |
27 | echo " * This file was generated by Kbuild"; \ | |
28 | echo " */"; \ | |
29 | echo ""; \ | |
30 | sed -ne $(sed-y); \ | |
31 | echo ""; \ | |
32 | echo "#endif" ) | |
33 | endef | |
34 | ||
35 | ##### | |
36 | # 1) Generate bounds.h | |
37 | ||
38 | bounds-file := include/generated/bounds.h | |
39 | ||
40 | always := $(bounds-file) | |
41 | targets := kernel/bounds.s | |
42 | ||
43 | # We use internal kbuild rules to avoid the "is up to date" message from make | |
44 | kernel/bounds.s: kernel/bounds.c FORCE | |
45 | $(Q)mkdir -p $(dir $@) | |
46 | $(call if_changed_dep,cc_s_c) | |
47 | ||
48 | $(obj)/$(bounds-file): kernel/bounds.s FORCE | |
49 | $(call filechk,offsets,__LINUX_BOUNDS_H__) | |
50 | ||
51 | ##### | |
52 | # 2) Generate timeconst.h | |
53 | ||
54 | timeconst-file := include/generated/timeconst.h | |
55 | ||
56 | targets += $(timeconst-file) | |
57 | ||
58 | quiet_cmd_gentimeconst = GEN $@ | |
59 | define cmd_gentimeconst | |
60 | (echo $(CONFIG_HZ) | bc -q $< ) > $@ | |
61 | endef | |
62 | define filechk_gentimeconst | |
63 | (echo $(CONFIG_HZ) | bc -q $< ) | |
64 | endef | |
65 | ||
66 | $(obj)/$(timeconst-file): kernel/time/timeconst.bc FORCE | |
67 | $(call filechk,gentimeconst) | |
68 | ||
69 | ##### | |
70 | # 3) Generate asm-offsets.h | |
71 | # | |
72 | ||
73 | offsets-file := include/generated/asm-offsets.h | |
74 | ||
75 | always += $(offsets-file) | |
76 | targets += arch/$(SRCARCH)/kernel/asm-offsets.s | |
77 | ||
78 | # We use internal kbuild rules to avoid the "is up to date" message from make | |
79 | arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \ | |
80 | $(obj)/$(timeconst-file) $(obj)/$(bounds-file) FORCE | |
81 | $(Q)mkdir -p $(dir $@) | |
82 | $(call if_changed_dep,cc_s_c) | |
83 | ||
84 | $(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE | |
85 | $(call filechk,offsets,__ASM_OFFSETS_H__) | |
86 | ||
87 | ##### | |
88 | # 4) Check for missing system calls | |
89 | # | |
90 | ||
91 | always += missing-syscalls | |
92 | targets += missing-syscalls | |
93 | ||
94 | quiet_cmd_syscalls = CALL $< | |
95 | cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags) | |
96 | ||
97 | missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE | |
98 | $(call cmd,syscalls) | |
99 | ||
100 | ##### | |
101 | # 5) Generate constants for Python GDB integration | |
102 | # | |
103 | ||
104 | extra-$(CONFIG_GDB_SCRIPTS) += build_constants_py | |
105 | ||
106 | build_constants_py: $(obj)/$(timeconst-file) $(obj)/$(bounds-file) | |
107 | @$(MAKE) $(build)=scripts/gdb/linux $@ | |
108 | ||
109 | # Keep these three files during make clean | |
110 | no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file) |