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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 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
91quiet_cmd_syscalls = CALL $<
92 cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags)
93
94PHONY += missing-syscalls
95missing-syscalls: scripts/checksyscalls.sh FORCE
96 $(call cmd,syscalls)
97
98# Keep these two files during make clean
99no-clean-files := $(bounds-file) $(offsets-file)
1# SPDX-License-Identifier: GPL-2.0
2#
3# Kbuild for top-level directory of the kernel
4# This file takes care of the following:
5# 1) Generate bounds.h
6# 2) Generate timeconst.h
7# 3) Generate asm-offsets.h (may need bounds.h and timeconst.h)
8# 4) Check for missing system calls
9# 5) Generate constants.py (may need bounds.h)
10
11#####
12# 1) Generate bounds.h
13
14bounds-file := include/generated/bounds.h
15
16always := $(bounds-file)
17targets := kernel/bounds.s
18
19# We use internal kbuild rules to avoid the "is up to date" message from make
20kernel/bounds.s: kernel/bounds.c FORCE
21 $(call if_changed_dep,cc_s_c)
22
23$(obj)/$(bounds-file): kernel/bounds.s FORCE
24 $(call filechk,offsets,__LINUX_BOUNDS_H__)
25
26#####
27# 2) Generate timeconst.h
28
29timeconst-file := include/generated/timeconst.h
30
31targets += $(timeconst-file)
32
33quiet_cmd_gentimeconst = GEN $@
34define cmd_gentimeconst
35 (echo $(CONFIG_HZ) | bc -q $< ) > $@
36endef
37define filechk_gentimeconst
38 (echo $(CONFIG_HZ) | bc -q $< )
39endef
40
41$(obj)/$(timeconst-file): kernel/time/timeconst.bc FORCE
42 $(call filechk,gentimeconst)
43
44#####
45# 3) Generate asm-offsets.h
46#
47
48offsets-file := include/generated/asm-offsets.h
49
50always += $(offsets-file)
51targets += arch/$(SRCARCH)/kernel/asm-offsets.s
52
53# We use internal kbuild rules to avoid the "is up to date" message from make
54arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \
55 $(obj)/$(timeconst-file) $(obj)/$(bounds-file) FORCE
56 $(call if_changed_dep,cc_s_c)
57
58$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE
59 $(call filechk,offsets,__ASM_OFFSETS_H__)
60
61#####
62# 4) Check for missing system calls
63#
64
65always += missing-syscalls
66targets += missing-syscalls
67
68quiet_cmd_syscalls = CALL $<
69 cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)
70
71missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE
72 $(call cmd,syscalls)
73
74#####
75# 5) Generate constants for Python GDB integration
76#
77
78extra-$(CONFIG_GDB_SCRIPTS) += build_constants_py
79
80build_constants_py: $(obj)/$(timeconst-file) $(obj)/$(bounds-file)
81 @$(MAKE) $(build)=scripts/gdb/linux $@
82
83# Keep these three files during make clean
84no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file)