[linux-2.6-block.git] / Kbuild

# SPDX-License-Identifier: GPL-2.0
#
# Kbuild for top-level directory of the kernel
# This file takes care of the following:
# 1) Generate bounds.h
# 2) Generate timeconst.h
# 3) Generate asm-offsets.h (may need bounds.h and timeconst.h)
# 4) Check for missing system calls
# 5) check atomics headers are up-to-date
# 6) Generate constants.py (may need bounds.h)

#####
# 1) Generate bounds.h

bounds-file := include/generated/bounds.h

always  := $(bounds-file)
targets := kernel/bounds.s

# We use internal kbuild rules to avoid the "is up to date" message from make
kernel/bounds.s: kernel/bounds.c FORCE
	$(call if_changed_dep,cc_s_c)

$(obj)/$(bounds-file): kernel/bounds.s FORCE
	$(call filechk,offsets,__LINUX_BOUNDS_H__)

#####
# 2) Generate timeconst.h

timeconst-file := include/generated/timeconst.h

targets += $(timeconst-file)

quiet_cmd_gentimeconst = GEN     $@
define cmd_gentimeconst
	(echo $(CONFIG_HZ) | bc -q $< ) > $@
endef
define filechk_gentimeconst
	(echo $(CONFIG_HZ) | bc -q $< )
endef

$(obj)/$(timeconst-file): kernel/time/timeconst.bc FORCE
	$(call filechk,gentimeconst)

#####
# 3) Generate asm-offsets.h
#

offsets-file := include/generated/asm-offsets.h

always  += $(offsets-file)
targets += arch/$(SRCARCH)/kernel/asm-offsets.s

# 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 \
                                      $(obj)/$(timeconst-file) $(obj)/$(bounds-file) FORCE
	$(call if_changed_dep,cc_s_c)

$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE
	$(call filechk,offsets,__ASM_OFFSETS_H__)

#####
# 4) 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)

#####
# 5) Check atomic headers are up-to-date
#

always += old-atomics
targets += old-atomics

quiet_cmd_atomics = CALL    $<
      cmd_atomics = $(CONFIG_SHELL) $<

old-atomics: scripts/atomic/check-atomics.sh FORCE
	$(call cmd,atomics)

#####
# 6) Generate constants for Python GDB integration
#

extra-$(CONFIG_GDB_SCRIPTS) += build_constants_py

build_constants_py: $(obj)/$(timeconst-file) $(obj)/$(bounds-file)
	@$(MAKE) $(build)=scripts/gdb/linux $@

# Keep these three files during make clean
no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file)
Commit	Line	Data
b2441318	1	# SPDX-License-Identifier: GPL-2.0
86feeaa8 SR	2	#
	3	# Kbuild for top-level directory of the kernel
	4	# This file takes care of the following:
1cdf25d7	5	# 1) Generate bounds.h
0a227985 NMG	6	# 2) Generate timeconst.h
	7	# 3) Generate asm-offsets.h (may need bounds.h and timeconst.h)
	8	# 4) Check for missing system calls
8d325880 MR	9	# 5) check atomics headers are up-to-date
8d325880 MR	10	# 6) Generate constants.py (may need bounds.h)
86feeaa8	11
39664e2f MY	12	#####
	13	# 1) Generate bounds.h
	14
	15	bounds-file := include/generated/bounds.h
	16
	17	always := $(bounds-file)
8a58e162	18	targets := kernel/bounds.s
39664e2f	19
1cdf25d7 CL	20	# We use internal kbuild rules to avoid the "is up to date" message from make
1cdf25d7 CL	21	kernel/bounds.s: kernel/bounds.c FORCE
1cdf25d7 CL	22	$(call if_changed_dep,cc_s_c)
1cdf25d7 CL	23
70a4fd6c MM	24	$(obj)/$(bounds-file): kernel/bounds.s FORCE
70a4fd6c MM	25	$(call filechk,offsets,__LINUX_BOUNDS_H__)
1cdf25d7 CL	26
1cdf25d7 CL	27	#####
0a227985 NMG	28	# 2) Generate timeconst.h
	29
	30	timeconst-file := include/generated/timeconst.h
	31
0a227985 NMG	32	targets += $(timeconst-file)
	33
	34	quiet_cmd_gentimeconst = GEN $@
	35	define cmd_gentimeconst
	36	(echo $(CONFIG_HZ) \| bc -q $< ) > $@
	37	endef
	38	define filechk_gentimeconst
	39	(echo $(CONFIG_HZ) \| bc -q $< )
	40	endef
	41
	42	$(obj)/$(timeconst-file): kernel/time/timeconst.bc FORCE
	43	$(call filechk,gentimeconst)
	44
	45	#####
	46	# 3) Generate asm-offsets.h
86feeaa8 SR	47	#
86feeaa8 SR	48
559df2e0	49	offsets-file := include/generated/asm-offsets.h
86feeaa8	50
1cdf25d7	51	always += $(offsets-file)
6752ed90	52	targets += arch/$(SRCARCH)/kernel/asm-offsets.s
1cdf25d7	53
86feeaa8	54	# We use internal kbuild rules to avoid the "is up to date" message from make
1cdf25d7	55	arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \
0a227985	56	$(obj)/$(timeconst-file) $(obj)/$(bounds-file) FORCE
86feeaa8 SR	57	$(call if_changed_dep,cc_s_c)
86feeaa8 SR	58
70a4fd6c MM	59	$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE
70a4fd6c MM	60	$(call filechk,offsets,__ASM_OFFSETS_H__)
86feeaa8	61
c53aeca0	62	#####
0a227985	63	# 4) Check for missing system calls
c53aeca0 SR	64	#
c53aeca0 SR	65
5f7efb4c AL	66	always += missing-syscalls
	67	targets += missing-syscalls
	68
c53aeca0	69	quiet_cmd_syscalls = CALL $<
44656fa0	70	cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)
c53aeca0	71
5f7efb4c	72	missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE
c53aeca0	73	$(call cmd,syscalls)
1cdf25d7	74
f197d75f	75	#####
8d325880 MR	76	# 5) Check atomic headers are up-to-date
	77	#
	78
	79	always += old-atomics
	80	targets += old-atomics
	81
	82	quiet_cmd_atomics = CALL $<
bdf37b4d	83	cmd_atomics = $(CONFIG_SHELL) $<
8d325880 MR	84
	85	old-atomics: scripts/atomic/check-atomics.sh FORCE
	86	$(call cmd,atomics)
	87
	88	#####
	89	# 6) Generate constants for Python GDB integration
f197d75f KB	90	#
	91
	92	extra-$(CONFIG_GDB_SCRIPTS) += build_constants_py
	93
	94	build_constants_py: $(obj)/$(timeconst-file) $(obj)/$(bounds-file)
	95	@$(MAKE) $(build)=scripts/gdb/linux $@
	96
0a227985 NMG	97	# Keep these three files during make clean
0a227985 NMG	98	no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file)