xref: /openbmc/linux/Kbuild (revision 8e9356c6) 
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#####
9# 1) Generate bounds.h
10
11bounds-file := include/generated/bounds.h
12
13always  := $(bounds-file)
14targets := $(bounds-file) kernel/bounds.s
15
16quiet_cmd_bounds = GEN     $@
17define cmd_bounds
18	(set -e; \
19	 echo "#ifndef __LINUX_BOUNDS_H__"; \
20	 echo "#define __LINUX_BOUNDS_H__"; \
21	 echo "/*"; \
22	 echo " * DO NOT MODIFY."; \
23	 echo " *"; \
24	 echo " * This file was generated by Kbuild"; \
25	 echo " *"; \
26	 echo " */"; \
27	 echo ""; \
28	 sed -ne $(sed-y) $<; \
29	 echo ""; \
30	 echo "#endif" ) > $@
31endef
32
33# We use internal kbuild rules to avoid the "is up to date" message from make
34kernel/bounds.s: kernel/bounds.c FORCE
35	$(Q)mkdir -p $(dir $@)
36	$(call if_changed_dep,cc_s_c)
37
38$(obj)/$(bounds-file): kernel/bounds.s Kbuild
39	$(Q)mkdir -p $(dir $@)
40	$(call cmd,bounds)
41
42#####
43# 2) Generate asm-offsets.h
44#
45
46offsets-file := include/generated/asm-offsets.h
47
48always  += $(offsets-file)
49targets += $(offsets-file)
50targets += arch/$(SRCARCH)/kernel/asm-offsets.s
51
52
53# Default sed regexp - multiline due to syntax constraints
54define sed-y
55	"/^->/{s:->#\(.*\):/* \1 */:; \
56	s:^->\([^ ]*\) [\$$#]*\([-0-9]*\) \(.*\):#define \1 \2 /* \3 */:; \
57	s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
58	s:->::; p;}"
59endef
60
61quiet_cmd_offsets = GEN     $@
62define cmd_offsets
63	(set -e; \
64	 echo "#ifndef __ASM_OFFSETS_H__"; \
65	 echo "#define __ASM_OFFSETS_H__"; \
66	 echo "/*"; \
67	 echo " * DO NOT MODIFY."; \
68	 echo " *"; \
69	 echo " * This file was generated by Kbuild"; \
70	 echo " *"; \
71	 echo " */"; \
72	 echo ""; \
73	 sed -ne $(sed-y) $<; \
74	 echo ""; \
75	 echo "#endif" ) > $@
76endef
77
78# We use internal kbuild rules to avoid the "is up to date" message from make
79arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \
80                                      $(obj)/$(bounds-file) FORCE
81	$(Q)mkdir -p $(dir $@)
82	$(call if_changed_dep,cc_s_c)
83
84$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s Kbuild
85	$(call cmd,offsets)
86
87#####
88# 3) Check for missing system calls
89#
90
91always += missing-syscalls
92targets += missing-syscalls
93
94quiet_cmd_syscalls = CALL    $<
95      cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)
96
97missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE
98	$(call cmd,syscalls)
99
100# Keep these two files during make clean
101no-clean-files := $(bounds-file) $(offsets-file)
102