xref: /openbmc/linux/Kbuild (revision 87c2ce3b)
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
6#####
7# 1) Generate asm-offsets.h
8#
9
10offsets-file := include/asm-$(ARCH)/asm-offsets.h
11
12always  := $(offsets-file)
13targets := $(offsets-file)
14targets += arch/$(ARCH)/kernel/asm-offsets.s
15
16# Default sed regexp - multiline due to syntax constraints
17define sed-y
18	"/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"
19endef
20# Override default regexp for specific architectures
21sed-$(CONFIG_MIPS) := "/^@@@/s///p"
22
23quiet_cmd_offsets = GEN     $@
24define cmd_offsets
25	mkdir -p $(dir $@); \
26	cat $< | \
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 $(srctree)/Kbuild"; \
34	 echo " *"; \
35	 echo " */"; \
36	 echo ""; \
37	 sed -ne $(sed-y); \
38	 echo ""; \
39	 echo "#endif" ) > $@
40endef
41
42# We use internal kbuild rules to avoid the "is up to date" message from make
43arch/$(ARCH)/kernel/asm-offsets.s: arch/$(ARCH)/kernel/asm-offsets.c FORCE
44	$(Q)mkdir -p $(dir $@)
45	$(call if_changed_dep,cc_s_c)
46
47$(obj)/$(offsets-file): arch/$(ARCH)/kernel/asm-offsets.s Kbuild
48	$(call cmd,offsets)
49
50