blob: af161aa1facd194baeb574e9d36a530274411702 [file] [log] [blame]
Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001# SPDX-License-Identifier: GPL-2.0
Sam Ravnborg86feeaa2005-09-09 19:28:28 +02002#
3# Kbuild for top-level directory of the kernel
4# This file takes care of the following:
Christoph Lameter1cdf25d2008-04-28 02:12:44 -07005# 1) Generate bounds.h
Nicholas Mc Guire0a227982015-05-18 14:19:12 +02006# 2) Generate timeconst.h
7# 3) Generate asm-offsets.h (may need bounds.h and timeconst.h)
8# 4) Check for missing system calls
Kieran Binghamf197d752016-05-23 16:24:40 -07009# 5) Generate constants.py (may need bounds.h)
Sam Ravnborg86feeaa2005-09-09 19:28:28 +020010
Masahiro Yamada39664e22015-01-05 15:57:15 +090011#####
12# 1) Generate bounds.h
13
14bounds-file := include/generated/bounds.h
15
16always := $(bounds-file)
Masahiro Yamada8a58e162015-03-26 20:59:52 +090017targets := kernel/bounds.s
Masahiro Yamada39664e22015-01-05 15:57:15 +090018
19# We use internal kbuild rules to avoid the "is up to date" message from make
20kernel/bounds.s: kernel/bounds.c FORCE
21 $(Q)mkdir -p $(dir $@)
22 $(call if_changed_dep,cc_s_c)
23
Michal Marek70a4fd62015-03-11 11:01:01 +010024$(obj)/$(bounds-file): kernel/bounds.s FORCE
25 $(call filechk,offsets,__LINUX_BOUNDS_H__)
Masahiro Yamada39664e22015-01-05 15:57:15 +090026
27#####
Nicholas Mc Guire0a227982015-05-18 14:19:12 +020028# 2) Generate timeconst.h
29
30timeconst-file := include/generated/timeconst.h
31
Nicholas Mc Guire0a227982015-05-18 14:19:12 +020032targets += $(timeconst-file)
33
34quiet_cmd_gentimeconst = GEN $@
35define cmd_gentimeconst
36 (echo $(CONFIG_HZ) | bc -q $< ) > $@
37endef
38define filechk_gentimeconst
39 (echo $(CONFIG_HZ) | bc -q $< )
40endef
41
42$(obj)/$(timeconst-file): kernel/time/timeconst.bc FORCE
43 $(call filechk,gentimeconst)
44
45#####
46# 3) Generate asm-offsets.h
Masahiro Yamada39664e22015-01-05 15:57:15 +090047#
48
49offsets-file := include/generated/asm-offsets.h
50
51always += $(offsets-file)
Masahiro Yamada39664e22015-01-05 15:57:15 +090052targets += arch/$(SRCARCH)/kernel/asm-offsets.s
53
Sam Ravnborg86feeaa2005-09-09 19:28:28 +020054# We use internal kbuild rules to avoid the "is up to date" message from make
Christoph Lameter1cdf25d2008-04-28 02:12:44 -070055arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \
Nicholas Mc Guire0a227982015-05-18 14:19:12 +020056 $(obj)/$(timeconst-file) $(obj)/$(bounds-file) FORCE
Sam Ravnborg86feeaa2005-09-09 19:28:28 +020057 $(Q)mkdir -p $(dir $@)
58 $(call if_changed_dep,cc_s_c)
59
Michal Marek70a4fd62015-03-11 11:01:01 +010060$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE
61 $(call filechk,offsets,__ASM_OFFSETS_H__)
Sam Ravnborg86feeaa2005-09-09 19:28:28 +020062
Sam Ravnborgc53aeca2007-03-27 22:50:29 +020063#####
Nicholas Mc Guire0a227982015-05-18 14:19:12 +020064# 4) Check for missing system calls
Sam Ravnborgc53aeca2007-03-27 22:50:29 +020065#
66
Arnaud Lacombe5f7efb42011-08-24 21:03:30 -040067always += missing-syscalls
68targets += missing-syscalls
69
Sam Ravnborgc53aeca2007-03-27 22:50:29 +020070quiet_cmd_syscalls = CALL $<
David Daney44656fa2011-11-08 10:20:10 -080071 cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)
Sam Ravnborgc53aeca2007-03-27 22:50:29 +020072
Arnaud Lacombe5f7efb42011-08-24 21:03:30 -040073missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE
Sam Ravnborgc53aeca2007-03-27 22:50:29 +020074 $(call cmd,syscalls)
Christoph Lameter1cdf25d2008-04-28 02:12:44 -070075
Kieran Binghamf197d752016-05-23 16:24:40 -070076#####
77# 5) Generate constants for Python GDB integration
78#
79
80extra-$(CONFIG_GDB_SCRIPTS) += build_constants_py
81
82build_constants_py: $(obj)/$(timeconst-file) $(obj)/$(bounds-file)
83 @$(MAKE) $(build)=scripts/gdb/linux $@
84
Nicholas Mc Guire0a227982015-05-18 14:19:12 +020085# Keep these three files during make clean
86no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file)