Kbuild

   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 asm-offsets.h (may need bounds.h)
   6 # 3) Check for missing system calls
   7
   8 # Default sed regexp - multiline due to syntax constraints
   9 define sed-y
  10         "/^->/{s:->#\(.*\):/* \1 */:; \
  11         s:^->\([^ ]*\) [\$$#]*\([-0-9]*\) \(.*\):#define \1 \2 /* \3 */:; \
  12         s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
  13         s:->::; p;}"
  14 endef
  15
  16 quiet_cmd_offsets = GEN     $@
  17 define cmd_offsets
  18         (set -e; \
  19          echo "#ifndef $2"; \
  20          echo "#define $2"; \
  21          echo "/*"; \
  22          echo " * DO NOT MODIFY."; \
  23          echo " *"; \
  24          echo " * This file was generated by Kbuild"; \
  25          echo " */"; \
  26          echo ""; \
  27          sed -ne $(sed-y) $<; \
  28          echo ""; \
  29          echo "#endif" ) > $@
  30 endef
  31
  32 #####
  33 # 1) Generate bounds.h
  34
  35 bounds-file := include/generated/bounds.h
  36
  37 always  := $(bounds-file)
  38 targets := $(bounds-file) kernel/bounds.s
  39
  40 # We use internal kbuild rules to avoid the "is up to date" message from make
  41 kernel/bounds.s: kernel/bounds.c FORCE
  42         $(Q)mkdir -p $(dir $@)
  43         $(call if_changed_dep,cc_s_c)
  44
  45 $(obj)/$(bounds-file): kernel/bounds.s Kbuild
  46         $(Q)mkdir -p $(dir $@)
  47         $(call cmd,offsets,__LINUX_BOUNDS_H__)
  48
  49 #####
  50 # 2) Generate asm-offsets.h
  51 #
  52
  53 offsets-file := include/generated/asm-offsets.h
  54
  55 always  += $(offsets-file)
  56 targets += $(offsets-file)
  57 targets += arch/$(SRCARCH)/kernel/asm-offsets.s
  58
  59 # We use internal kbuild rules to avoid the "is up to date" message from make
  60 arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \
  61                                       $(obj)/$(bounds-file) FORCE
  62         $(Q)mkdir -p $(dir $@)
  63         $(call if_changed_dep,cc_s_c)
  64
  65 $(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s Kbuild
  66         $(call cmd,offsets,__ASM_OFFSETS_H__)
  67
  68 #####
  69 # 3) Check for missing system calls
  70 #
  71
  72 always += missing-syscalls
  73 targets += missing-syscalls
  74
  75 quiet_cmd_syscalls = CALL    $<
  76       cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)
  77
  78 missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE
  79         $(call cmd,syscalls)
  80
  81 # Keep these two files during make clean
  82 no-clean-files := $(bounds-file) $(offsets-file)