Root/Kbuild

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 asm-offsets.h (may need bounds.h)
6# 3) Check for missing system calls
7
8#####
9# 1) Generate bounds.h
10
11bounds-file := include/linux/bounds.h
12
13always := $(bounds-file)
14targets := $(bounds-file) kernel/bounds.s
15
16quiet_cmd_bounds = GEN $@
17define cmd_bounds
18    (set -e; \
19     echo "#ifndef __LINUX_BOUNDS_H__"; \
20     echo "#define __LINUX_BOUNDS_H__"; \
21     echo "/*"; \
22     echo " * DO NOT MODIFY."; \
23     echo " *"; \
24     echo " * This file was generated by Kbuild"; \
25     echo " *"; \
26     echo " */"; \
27     echo ""; \
28     sed -ne $(sed-y) $<; \
29     echo ""; \
30     echo "#endif" ) > $@
31endef
32
33# We use internal kbuild rules to avoid the "is up to date" message from make
34kernel/bounds.s: kernel/bounds.c FORCE
35    $(Q)mkdir -p $(dir $@)
36    $(call if_changed_dep,cc_s_c)
37
38$(obj)/$(bounds-file): kernel/bounds.s Kbuild
39    $(Q)mkdir -p $(dir $@)
40    $(call cmd,bounds)
41
42#####
43# 2) Generate asm-offsets.h
44#
45
46offsets-file := include/asm/asm-offsets.h
47
48always += $(offsets-file)
49targets += $(offsets-file)
50targets += arch/$(SRCARCH)/kernel/asm-offsets.s
51
52
53# Default sed regexp - multiline due to syntax constraints
54define sed-y
55    "/^->/{s:->#\(.*\):/* \1 */:; \
56    s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
57    s:->::; p;}"
58endef
59
60quiet_cmd_offsets = GEN $@
61define cmd_offsets
62    (set -e; \
63     echo "#ifndef __ASM_OFFSETS_H__"; \
64     echo "#define __ASM_OFFSETS_H__"; \
65     echo "/*"; \
66     echo " * DO NOT MODIFY."; \
67     echo " *"; \
68     echo " * This file was generated by Kbuild"; \
69     echo " *"; \
70     echo " */"; \
71     echo ""; \
72     sed -ne $(sed-y) $<; \
73     echo ""; \
74     echo "#endif" ) > $@
75endef
76
77# We use internal kbuild rules to avoid the "is up to date" message from make
78arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \
79                                      $(obj)/$(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 Kbuild
84    $(call cmd,offsets)
85
86#####
87# 3) Check for missing system calls
88#
89
90quiet_cmd_syscalls = CALL $<
91      cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags)
92
93PHONY += missing-syscalls
94missing-syscalls: scripts/checksyscalls.sh FORCE
95    $(call cmd,syscalls)
96
97# Delete all targets during make clean
98clean-files := $(addprefix $(objtree)/,$(filter-out $(bounds-file) $(offsets-file),$(targets)))
99

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