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/generated/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/generated/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:^->\([^ ]*\) [\$$#]*\([-0-9]*\) \(.*\):#define \1 \2 /* \3 */:; \
  57         s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
  58         s:->::; p;}"
  59 endef
  60
  61 quiet_cmd_offsets = GEN     $@
  62 define cmd_offsets
  63         (set -e; \
  64          echo "#ifndef __ASM_OFFSETS_H__"; \
  65          echo "#define __ASM_OFFSETS_H__"; \
  66          echo "/*"; \
  67          echo " * DO NOT MODIFY."; \
  68          echo " *"; \
  69          echo " * This file was generated by Kbuild"; \
  70          echo " *"; \
  71          echo " */"; \
  72          echo ""; \
  73          sed -ne $(sed-y) $<; \
  74          echo ""; \
  75          echo "#endif" ) > $@
  76 endef
  77
  78 # We use internal kbuild rules to avoid the "is up to date" message from make
  79 arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \
  80                                       $(obj)/$(bounds-file) FORCE
  81         $(Q)mkdir -p $(dir $@)
  82         $(call if_changed_dep,cc_s_c)
  83
  84 $(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s Kbuild
  85         $(call cmd,offsets)
  86
  87 #####
  88 # 3) Check for missing system calls
  89 #
  90
  91 always += missing-syscalls
  92 targets += missing-syscalls
  93
  94 quiet_cmd_syscalls = CALL    $<
  95       cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)
  96
  97 missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE
  98         $(call cmd,syscalls)
  99
 100 # Keep these two files during make clean
 101 no-clean-files := $(bounds-file) $(offsets-file)