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 asm-offsets.h
   5# 2) Check for missing system calls
   6
   7#####
   8# 1) Generate asm-offsets.h
   9#
  10
  11offsets-file := include/asm-$(SRCARCH)/asm-offsets.h
  12
  13always  := $(offsets-file)
  14targets := $(offsets-file)
  15targets += arch/$(SRCARCH)/kernel/asm-offsets.s
  16clean-files := $(addprefix $(objtree)/,$(targets))
  17
  18# Default sed regexp - multiline due to syntax constraints
  19define sed-y
  20        "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"
  21endef
  22# Override default regexp for specific architectures
  23sed-$(CONFIG_MIPS) := "/^@@@/{s/^@@@//; s/ \#.*\$$//; p;}"
  24
  25quiet_cmd_offsets = GEN     $@
  26define 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" ) > $@
  40endef
  41
  42# We use internal kbuild rules to avoid the "is up to date" message from make
  43arch/$(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
  55quiet_cmd_syscalls = CALL    $<
  56      cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags)
  57
  58PHONY += missing-syscalls
  59missing-syscalls: scripts/checksyscalls.sh FORCE
  60        $(call cmd,syscalls)
  61
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