1 # SPDX-License-Identifier: GPL-2.0 <<
2 # 1 #
3 # Kbuild for top-level directory of the kernel 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 timeconst.h
>> 6 # 3) Generate asm-offsets.h (may need bounds.h and timeconst.h)
>> 7 # 4) Check for missing system calls
>> 8 # 5) Generate constants.py (may need bounds.h)
>> 9
>> 10 # Default sed regexp - multiline due to syntax constraints
>> 11 define sed-y
>> 12 "/^->/{s:->#\(.*\):/* \1 */:; \
>> 13 s:^->\([^ ]*\) [\$$#]*\([-0-9]*\) \(.*\):#define \1 \2 /* \3 */:; \
>> 14 s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
>> 15 s:->::; p;}"
>> 16 endef
>> 17
>> 18 # Use filechk to avoid rebuilds when a header changes, but the resulting file
>> 19 # does not
>> 20 define filechk_offsets
>> 21 (set -e; \
>> 22 echo "#ifndef $2"; \
>> 23 echo "#define $2"; \
>> 24 echo "/*"; \
>> 25 echo " * DO NOT MODIFY."; \
>> 26 echo " *"; \
>> 27 echo " * This file was generated by Kbuild"; \
>> 28 echo " */"; \
>> 29 echo ""; \
>> 30 sed -ne $(sed-y); \
>> 31 echo ""; \
>> 32 echo "#endif" )
>> 33 endef
4 34
5 # Prepare global headers and check sanity befo !! 35 #####
6 # -------------------------------------------- !! 36 # 1) Generate bounds.h
7 <<
8 # Generate bounds.h <<
9 37
10 bounds-file := include/generated/bounds.h 38 bounds-file := include/generated/bounds.h
11 39
>> 40 always := $(bounds-file)
12 targets := kernel/bounds.s 41 targets := kernel/bounds.s
13 42
14 $(bounds-file): kernel/bounds.s FORCE !! 43 # We use internal kbuild rules to avoid the "is up to date" message from make
>> 44 kernel/bounds.s: kernel/bounds.c FORCE
>> 45 $(Q)mkdir -p $(dir $@)
>> 46 $(call if_changed_dep,cc_s_c)
>> 47
>> 48 $(obj)/$(bounds-file): kernel/bounds.s FORCE
15 $(call filechk,offsets,__LINUX_BOUNDS_ 49 $(call filechk,offsets,__LINUX_BOUNDS_H__)
16 50
17 # Generate timeconst.h !! 51 #####
>> 52 # 2) Generate timeconst.h
18 53
19 timeconst-file := include/generated/timeconst. 54 timeconst-file := include/generated/timeconst.h
20 55
21 filechk_gentimeconst = echo $(CONFIG_HZ) | bc !! 56 targets += $(timeconst-file)
>> 57
>> 58 quiet_cmd_gentimeconst = GEN $@
>> 59 define cmd_gentimeconst
>> 60 (echo $(CONFIG_HZ) | bc -q $< ) > $@
>> 61 endef
>> 62 define filechk_gentimeconst
>> 63 (echo $(CONFIG_HZ) | bc -q $< )
>> 64 endef
22 65
23 $(timeconst-file): kernel/time/timeconst.bc FO !! 66 $(obj)/$(timeconst-file): kernel/time/timeconst.bc FORCE
24 $(call filechk,gentimeconst) 67 $(call filechk,gentimeconst)
25 68
26 # Generate asm-offsets.h !! 69 #####
>> 70 # 3) Generate asm-offsets.h
>> 71 #
27 72
28 offsets-file := include/generated/asm-offsets. 73 offsets-file := include/generated/asm-offsets.h
29 74
>> 75 always += $(offsets-file)
30 targets += arch/$(SRCARCH)/kernel/asm-offsets. 76 targets += arch/$(SRCARCH)/kernel/asm-offsets.s
31 77
32 arch/$(SRCARCH)/kernel/asm-offsets.s: $(timeco !! 78 # We use internal kbuild rules to avoid the "is up to date" message from make
>> 79 arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \
>> 80 $(obj)/$(timeconst-file) $(obj)/$(bounds-file) FORCE
>> 81 $(Q)mkdir -p $(dir $@)
>> 82 $(call if_changed_dep,cc_s_c)
33 83
34 $(offsets-file): arch/$(SRCARCH)/kernel/asm-of !! 84 $(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE
35 $(call filechk,offsets,__ASM_OFFSETS_H 85 $(call filechk,offsets,__ASM_OFFSETS_H__)
36 86
37 # Check for missing system calls !! 87 #####
>> 88 # 4) Check for missing system calls
>> 89 #
>> 90
>> 91 always += missing-syscalls
>> 92 targets += missing-syscalls
38 93
39 quiet_cmd_syscalls = CALL $< 94 quiet_cmd_syscalls = CALL $<
40 cmd_syscalls = $(CONFIG_SHELL) $< $(CC) 95 cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)
41 96
42 PHONY += missing-syscalls !! 97 missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE
43 missing-syscalls: scripts/checksyscalls.sh $(o <<
44 $(call cmd,syscalls) 98 $(call cmd,syscalls)
45 99
46 # Check the manual modification of atomic head !! 100 #####
>> 101 # 5) Generate constants for Python GDB integration
>> 102 #
>> 103
>> 104 extra-$(CONFIG_GDB_SCRIPTS) += build_constants_py
>> 105
>> 106 build_constants_py: $(obj)/$(timeconst-file) $(obj)/$(bounds-file)
>> 107 @$(MAKE) $(build)=scripts/gdb/linux $@
47 108
48 quiet_cmd_check_sha1 = CHKSHA1 $< !! 109 # Keep these three files during make clean
49 cmd_check_sha1 = \ !! 110 no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file)
50 if ! command -v sha1sum >/dev/null; th <<
51 echo "warning: cannot check th <<
52 exit 0; \ <<
53 fi; \ <<
54 if [ "$$(sed -n '$$s:// ::p' $<)" != \ <<
55 "$$(sed '$$d' $< | sha1sum | sed <<
56 echo "error: $< has been modif <<
57 exit 1; \ <<
58 fi; \ <<
59 touch $@ <<
60 <<
61 atomic-checks += $(addprefix $(obj)/.checked-, <<
62 atomic-arch-fallback.h \ <<
63 atomic-instrumented.h \ <<
64 atomic-long.h) <<
65 <<
66 targets += $(atomic-checks) <<
67 $(atomic-checks): $(obj)/.checked-%: include/l <<
68 $(call if_changed,check_sha1) <<
69 <<
70 # A phony target that depends on all the prepa <<
71 <<
72 PHONY += prepare <<
73 prepare: $(offsets-file) missing-syscalls $(at <<
74 @: <<
75 <<
76 # Ordinary directory descending <<
77 # -------------------------------------------- <<
78 <<
79 obj-y += init/ <<
80 obj-y += usr/ <<
81 obj-y += arch/$(SRCARCH)/ <<
82 obj-y += $(ARCH_CORE) <<
83 obj-y += kernel/ <<
84 obj-y += certs/ <<
85 obj-y += mm/ <<
86 obj-y += fs/ <<
87 obj-y += ipc/ <<
88 obj-y += security/ <<
89 obj-y += crypto/ <<
90 obj-$(CONFIG_BLOCK) += block/ <<
91 obj-$(CONFIG_IO_URING) += io_uring/ <<
92 obj-$(CONFIG_RUST) += rust/ <<
93 obj-y += $(ARCH_LIB) <<
94 obj-y += drivers/ <<
95 obj-y += sound/ <<
96 obj-$(CONFIG_SAMPLES) += samples/ <<
97 obj-$(CONFIG_NET) += net/ <<
98 obj-y += virt/ <<
99 obj-y += $(ARCH_DRIVERS) <<
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