Kbuild 2.48 KB
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#
# Kbuild for top-level directory of the kernel
# This file takes care of the following:
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# 1) Generate bounds.h
# 2) Generate asm-offsets.h (may need bounds.h)
# 3) Check for missing system calls
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#####
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# 1) Generate bounds.h

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

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offsets-file := include/generated/asm-offsets.h
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always  += $(offsets-file)
targets += $(offsets-file)
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targets += arch/$(SRCARCH)/kernel/asm-offsets.s
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# Default sed regexp - multiline due to syntax constraints
define sed-y
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	"/^->/{s:->#\(.*\):/* \1 */:; \
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	s:^->\([^ ]*\) [\$$#]*\([-0-9]*\) \(.*\):#define \1 \2 /* \3 */:; \
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	s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
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	s:->::; p;}"
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endef

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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 " *"; \
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	 echo " * This file was generated by Kbuild"; \
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	 echo " *"; \
	 echo " */"; \
	 echo ""; \
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	 sed -ne $(sed-y) $<; \
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	 echo ""; \
	 echo "#endif" ) > $@
endef

# We use internal kbuild rules to avoid the "is up to date" message from make
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arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \
                                      $(obj)/$(bounds-file) FORCE
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	$(Q)mkdir -p $(dir $@)
	$(call if_changed_dep,cc_s_c)

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$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s Kbuild
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	$(call cmd,offsets)

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#####
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# 3) Check for missing system calls
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#

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always += missing-syscalls
targets += missing-syscalls

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quiet_cmd_syscalls = CALL    $<
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      cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)
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missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE
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	$(call cmd,syscalls)
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# Keep these two files during make clean
no-clean-files := $(bounds-file) $(offsets-file)