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linux/Kbuild at master · WatterDu/linux · GitHub
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Kbuild
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#
#
Kbuild for top-level directory of the kernel
#
This file takes care of the following:
#
1) Generate bounds.h
#
2) Generate asm-offsets.h (may need bounds.h)
#
3) Check for missing system calls
#
####
#
1) Generate bounds.h
bounds-file
:= include/generated/bounds.h
always
:=
$(
bounds-file
)
targets
:=
$(
bounds-file
)
kernel/bounds.s
quiet_cmd_bounds
= GEN
$@
define
cmd_bounds
(set -e; \
echo "
#
ifndef __LINUX_BOUNDS_H__";
\
echo "#define __LINUX_BOUNDS_H__";
\
echo "/*";
\
echo " * DO NOT MODIFY.";
\
echo " *";
\
echo " * This file was generated by Kbuild";
\
echo " *";
\
echo " */";
\
echo "";
\
sed -ne $(sed-y) $<;
\
echo "";
\
echo "#endif" ) > $@
endef
#
We use internal kbuild rules to avoid the "is up to date" message from make
kernel/bounds.s
: kernel/bounds.c FORCE
$(
Q
)
mkdir -p
$(
dir
$@
)
$(
call
if_changed_dep,cc_s_c)
$(
obj
)
/
$(
bounds-file
)
: kernel/bounds.s Kbuild
$(
Q
)
mkdir -p
$(
dir
$@
)
$(
call
cmd,bounds)
#
####
#
2) Generate asm-offsets.h
#
offsets-file
:= include/generated/asm-offsets.h
always
+=
$(
offsets-file
)
targets
+=
$(
offsets-file
)
targets
+= arch/
$(
SRCARCH
)
/kernel/asm-offsets.s
#
Default sed regexp - multiline due to syntax constraints
define
sed-y
"/^->/{s:->
#
\(.*\):/* \1 */:;
\
s:^->\([^ ]*\) [\$$#]*\([-0-9]*\) \(.*\):#define \1 \2 /* \3 */:;
\
s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:;
\
s:->::; p;}"
endef
quiet_cmd_offsets
= GEN
$@
define
cmd_offsets
(set -e; \
echo "
#
ifndef __ASM_OFFSETS_H__";
\
echo "#define __ASM_OFFSETS_H__";
\
echo "/*";
\
echo " * DO NOT MODIFY.";
\
echo " *";
\
echo " * This file was generated by Kbuild";
\
echo " *";
\
echo " */";
\
echo "";
\
sed -ne $(sed-y) $<;
\
echo "";
\
echo "#endif" ) > $@
endef
#
We use internal kbuild rules to avoid the "is up to date" message from make
arch/
$(
SRCARCH
)
/kernel/asm-offsets.s
: arch/
$(
SRCARCH
)
/kernel/asm-offsets.c
\
$(obj)/$(bounds-file) FORCE
$(Q)mkdir -p $(dir $@)
$(call if_changed_dep,cc_s_c)
$(
obj
)
/
$(
offsets-file
)
: arch/
$(
SRCARCH
)
/kernel/asm-offsets.s Kbuild
$(
call
cmd,offsets)
#
####
#
3) Check for missing system calls
#
always
+= missing-syscalls
targets
+= missing-syscalls
quiet_cmd_syscalls
= CALL
$<
cmd_syscalls
=
$(
CONFIG_SHELL
)
$<
$(
CC
)
$(
c_flags
)
$(
missing_syscalls_flags
)
missing-syscalls
: scripts/checksyscalls.sh
$(
offsets-file
)
FORCE
$(
call
cmd,syscalls)
#
Keep these two files during make clean
no-clean-files
:=
$(
bounds-file
)
$(
offsets-file
)
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