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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