Kbuild

   1 #
   2 # Kbuild for top-level directory of the kernel
   3 # This file takes care of the following:
   4 # 1) Generate asm-offsets.h
   5 # 2) Check for missing system calls
   6
   7 #####
   8 # 1) Generate asm-offsets.h
   9 #
  10
  11 offsets-file := include/asm-$(ARCH)/asm-offsets.h
  12
  13 always  := $(offsets-file)
  14 targets := $(offsets-file)
  15 targets += arch/$(ARCH)/kernel/asm-offsets.s
  16
  17 # Default sed regexp - multiline due to syntax constraints
  18 define sed-y
  19         "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"
  20 endef
  21 # Override default regexp for specific architectures
  22 sed-$(CONFIG_MIPS) := "/^@@@/{s/^@@@//; s/ \#.*\$$//; p;}"
  23
  24 quiet_cmd_offsets = GEN     $@
  25 define cmd_offsets
  26         (set -e; \
  27          echo "#ifndef __ASM_OFFSETS_H__"; \
  28          echo "#define __ASM_OFFSETS_H__"; \
  29          echo "/*"; \
  30          echo " * DO NOT MODIFY."; \
  31          echo " *"; \
  32          echo " * This file was generated by Kbuild"; \
  33          echo " *"; \
  34          echo " */"; \
  35          echo ""; \
  36          sed -ne $(sed-y) $<; \
  37          echo ""; \
  38          echo "#endif" ) > $@
  39 endef
  40
  41 # We use internal kbuild rules to avoid the "is up to date" message from make
  42 arch/$(ARCH)/kernel/asm-offsets.s: arch/$(ARCH)/kernel/asm-offsets.c FORCE
  43         $(Q)mkdir -p $(dir $@)
  44         $(call if_changed_dep,cc_s_c)
  45
  46 $(obj)/$(offsets-file): arch/$(ARCH)/kernel/asm-offsets.s Kbuild
  47         $(Q)mkdir -p $(dir $@)
  48         $(call cmd,offsets)
  49
  50 #####
  51 # 2) Check for missing system calls
  52 #
  53
  54 quiet_cmd_syscalls = CALL    $<
  55       cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags)
  56
  57 PHONY += missing-syscalls
  58 missing-syscalls: scripts/checksyscalls.sh FORCE
  59         $(call cmd,syscalls)