linux/Kbuild
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   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
  11bounds-file := include/generated/bounds.h
  12
  13always  := $(bounds-file)
  14targets := $(bounds-file) kernel/bounds.s
  15
  16quiet_cmd_bounds = GEN     $@
  17define 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" ) > $@
  31endef
  32
  33# We use internal kbuild rules to avoid the "is up to date" message from make
  34kernel/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
  46offsets-file := include/generated/asm-offsets.h
  47
  48always  += $(offsets-file)
  49targets += $(offsets-file)
  50targets += arch/$(SRCARCH)/kernel/asm-offsets.s
  51
  52
  53# Default sed regexp - multiline due to syntax constraints
  54define sed-y
  55        "/^->/{s:->#\(.*\):/* \1 */:; \
  56        s:^->\([^ ]*\) [\$$#]*\([-0-9]*\) \(.*\):#define \1 \2 /* \3 */:; \
  57        s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
  58        s:->::; p;}"
  59endef
  60
  61quiet_cmd_offsets = GEN     $@
  62define 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" ) > $@
  76endef
  77
  78# We use internal kbuild rules to avoid the "is up to date" message from make
  79arch/$(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
  91always += missing-syscalls
  92targets += missing-syscalls
  93
  94quiet_cmd_syscalls = CALL    $<
  95      cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)
  96
  97missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE
  98        $(call cmd,syscalls)
  99
 100# Keep these two files during make clean
 101no-clean-files := $(bounds-file) $(offsets-file)
 102
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