1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 # 2 #
3 # Kbuild for top-level directory of the kernel 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)
4 10
5 # Prepare global headers and check sanity befo !! 11 #####
6 # -------------------------------------------- !! 12 # 1) Generate bounds.h
7 <<
8 # Generate bounds.h <<
9 13
10 bounds-file := include/generated/bounds.h 14 bounds-file := include/generated/bounds.h
11 15
>> 16 always := $(bounds-file)
12 targets := kernel/bounds.s 17 targets := kernel/bounds.s
13 18
14 $(bounds-file): kernel/bounds.s FORCE !! 19 # We use internal kbuild rules to avoid the "is up to date" message from make
>> 20 kernel/bounds.s: kernel/bounds.c FORCE
>> 21 $(call if_changed_dep,cc_s_c)
>> 22
>> 23 $(obj)/$(bounds-file): kernel/bounds.s FORCE
15 $(call filechk,offsets,__LINUX_BOUNDS_ 24 $(call filechk,offsets,__LINUX_BOUNDS_H__)
16 25
17 # Generate timeconst.h !! 26 #####
>> 27 # 2) Generate timeconst.h
18 28
19 timeconst-file := include/generated/timeconst. 29 timeconst-file := include/generated/timeconst.h
20 30
21 filechk_gentimeconst = echo $(CONFIG_HZ) | bc !! 31 targets += $(timeconst-file)
>> 32
>> 33 quiet_cmd_gentimeconst = GEN $@
>> 34 define cmd_gentimeconst
>> 35 (echo $(CONFIG_HZ) | bc -q $< ) > $@
>> 36 endef
>> 37 define filechk_gentimeconst
>> 38 (echo $(CONFIG_HZ) | bc -q $< )
>> 39 endef
22 40
23 $(timeconst-file): kernel/time/timeconst.bc FO !! 41 $(obj)/$(timeconst-file): kernel/time/timeconst.bc FORCE
24 $(call filechk,gentimeconst) 42 $(call filechk,gentimeconst)
25 43
26 # Generate asm-offsets.h !! 44 #####
>> 45 # 3) Generate asm-offsets.h
>> 46 #
27 47
28 offsets-file := include/generated/asm-offsets. 48 offsets-file := include/generated/asm-offsets.h
29 49
>> 50 always += $(offsets-file)
30 targets += arch/$(SRCARCH)/kernel/asm-offsets. 51 targets += arch/$(SRCARCH)/kernel/asm-offsets.s
31 52
32 arch/$(SRCARCH)/kernel/asm-offsets.s: $(timeco !! 53 # We use internal kbuild rules to avoid the "is up to date" message from make
>> 54 arch/$(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)
33 57
34 $(offsets-file): arch/$(SRCARCH)/kernel/asm-of !! 58 $(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE
35 $(call filechk,offsets,__ASM_OFFSETS_H 59 $(call filechk,offsets,__ASM_OFFSETS_H__)
36 60
37 # Check for missing system calls !! 61 #####
>> 62 # 4) Check for missing system calls
>> 63 #
>> 64
>> 65 always += missing-syscalls
>> 66 targets += missing-syscalls
38 67
39 quiet_cmd_syscalls = CALL $< 68 quiet_cmd_syscalls = CALL $<
40 cmd_syscalls = $(CONFIG_SHELL) $< $(CC) 69 cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)
41 70
42 PHONY += missing-syscalls !! 71 missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE
43 missing-syscalls: scripts/checksyscalls.sh $(o <<
44 $(call cmd,syscalls) 72 $(call cmd,syscalls)
45 73
46 # Check the manual modification of atomic head !! 74 #####
>> 75 # 5) Generate constants for Python GDB integration
>> 76 #
>> 77
>> 78 extra-$(CONFIG_GDB_SCRIPTS) += build_constants_py
>> 79
>> 80 build_constants_py: $(obj)/$(timeconst-file) $(obj)/$(bounds-file)
>> 81 @$(MAKE) $(build)=scripts/gdb/linux $@
47 82
48 quiet_cmd_check_sha1 = CHKSHA1 $< !! 83 # Keep these three files during make clean
49 cmd_check_sha1 = \ !! 84 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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