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 #####
   9 # 1) Generate bounds.h
  10
  11 bounds-file := include/linux/bounds.h
  12
  13 always  := $(bounds-file)
  14 targets := $(bounds-file) kernel/bounds.s
  15
  16 quiet_cmd_bounds = GEN     $@
  17 define cmd_bounds
  18         (set -e; \
  19          echo "#ifndef __LINUX_BOUNDS_H__"; \
  20          echo "#define __LINUX_BOUNDS_H__"; \
  21          echo "/*"; \
  22          echo " * DO NOT MODIFY."; \
  23          echo " *"; \
  24          echo " * This file was generated by Kbuild"; \
  25          echo " *"; \
  26          echo " */"; \
  27          echo ""; \
  28          sed -ne $(sed-y) $<; \
  29          echo ""; \
  30          echo "#endif" ) > $@
  31 endef
  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 Kbuild
  39         $(Q)mkdir -p $(dir $@)
  40         $(call cmd,bounds)
  41
  42 #####
  43 # 2) Generate asm-offsets.h
  44 #
  45
  46 offsets-file := include/asm-$(SRCARCH)/asm-offsets.h
  47
  48 always  += $(offsets-file)
  49 targets += $(offsets-file)
  50 targets += arch/$(SRCARCH)/kernel/asm-offsets.s
  51
  52
  53 # Default sed regexp - multiline due to syntax constraints
  54 define sed-y
  55         "/^->/{s:->#\(.*\):/* \1 */:; \
  56         s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
  57         s:->::; p;}"
  58 endef
  59
  60 quiet_cmd_offsets = GEN     $@
  61 define cmd_offsets
  62         (set -e; \
  63          echo "#ifndef __ASM_OFFSETS_H__"; \
  64          echo "#define __ASM_OFFSETS_H__"; \
  65          echo "/*"; \
  66          echo " * DO NOT MODIFY."; \
  67          echo " *"; \
  68          echo " * This file was generated by Kbuild"; \
  69          echo " *"; \
  70          echo " */"; \
  71          echo ""; \
  72          sed -ne $(sed-y) $<; \
  73          echo ""; \
  74          echo "#endif" ) > $@
  75 endef
  76
  77 # We use internal kbuild rules to avoid the "is up to date" message from make
  78 arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \
  79                                       $(obj)/$(bounds-file) FORCE
  80         $(Q)mkdir -p $(dir $@)
  81         $(call if_changed_dep,cc_s_c)
  82
  83 $(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s Kbuild
  84         $(Q)mkdir -p $(dir $@)
  85         $(call cmd,offsets)
  86
  87 #####
  88 # 3) Check for missing system calls
  89 #
  90
  91 quiet_cmd_syscalls = CALL    $<
  92       cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags)
  93
  94 PHONY += missing-syscalls
  95 missing-syscalls: scripts/checksyscalls.sh FORCE
  96         $(call cmd,syscalls)
  97
  98 # Delete all targets during make clean
  99 clean-files := $(addprefix $(objtree)/,$(filter-out $(bounds-file) $(offsets-file),$(targets)))