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# Default sed regexp - multiline due to syntax constraints 9define sed-y 10 "/^->/{s:->#\(.*\):/* \1 */:; \ 11 s:^->\([^ ]*\) [\$$#]*\([-0-9]*\) \(.*\):#define \1 \2 /* \3 */:; \ 12 s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \ 13 s:->::; p;}" 14endef 15 16# Use filechk to avoid rebuilds when a header changes, but the resulting file 17# does not 18define filechk_offsets 19 (set -e; \ 20 echo "#ifndef $2"; \ 21 echo "#define $2"; \ 22 echo "/*"; \ 23 echo " * DO NOT MODIFY."; \ 24 echo " *"; \ 25 echo " * This file was generated by Kbuild"; \ 26 echo " */"; \ 27 echo ""; \ 28 sed -ne $(sed-y); \ 29 echo ""; \ 30 echo "#endif" ) 31endef 32 33##### 34# 1) Generate bounds.h 35 36bounds-file := include/generated/bounds.h 37 38always := $(bounds-file) 39targets := kernel/bounds.s 40 41# We use internal kbuild rules to avoid the "is up to date" message from make 42kernel/bounds.s: kernel/bounds.c FORCE 43 $(Q)mkdir -p $(dir $@) 44 $(call if_changed_dep,cc_s_c) 45 46$(obj)/$(bounds-file): kernel/bounds.s FORCE 47 $(call filechk,offsets,__LINUX_BOUNDS_H__) 48 49##### 50# 2) Generate asm-offsets.h 51# 52 53offsets-file := include/generated/asm-offsets.h 54 55always += $(offsets-file) 56targets += arch/$(SRCARCH)/kernel/asm-offsets.s 57 58# We use internal kbuild rules to avoid the "is up to date" message from make 59arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \ 60 $(obj)/$(bounds-file) FORCE 61 $(Q)mkdir -p $(dir $@) 62 $(call if_changed_dep,cc_s_c) 63 64$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE 65 $(call filechk,offsets,__ASM_OFFSETS_H__) 66 67##### 68# 3) Check for missing system calls 69# 70 71always += missing-syscalls 72targets += missing-syscalls 73 74quiet_cmd_syscalls = CALL $< 75 cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags) 76 77missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE 78 $(call cmd,syscalls) 79 80# Keep these two files during make clean 81no-clean-files := $(bounds-file) $(offsets-file) 82