[deliverable/linux.git] / Kbuild

#
# 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) Generate constants.py (may need bounds.h)

# Use filechk to avoid rebuilds when a header changes, but the resulting file
# does not
define filechk_offsets
	(set -e; \
	 echo "#ifndef $2"; \
	 echo "#define $2"; \
	 echo "/*"; \
	 echo " * DO NOT MODIFY."; \
	 echo " *"; \
	 echo " * This file was generated by Kbuild"; \
	 echo " */"; \
	 sed -ne '/#define/{s/\$$//;s/#//2;s/$$/*\//;p;}'; \
	 echo "#endif" )
endef

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