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