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Kbuild 2.48 KB
86feeaa81   Sam Ravnborg   kbuild: full depe...
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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
86feeaa81   Sam Ravnborg   kbuild: full depe...
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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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86feeaa81   Sam Ravnborg   kbuild: full depe...
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048eb582f   Sam Ravnborg   kbuild: mips use ...
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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
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  	(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)