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 14 bounds-file := include/generated/bounds.h 15 16 always := $(bounds-file) 17 targets := kernel/bounds.s 18 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 24 $(call filechk,offsets,__LINUX_BOUNDS_H__) 25 26 ##### 27 # 2) Generate timeconst.h 28 29 timeconst-file := include/generated/timeconst.h 30 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 40 41 $(obj)/$(timeconst-file): kernel/time/timeconst.bc FORCE 42 $(call filechk,gentimeconst) 43 44 ##### 45 # 3) Generate asm-offsets.h 46 # 47 48 offsets-file := include/generated/asm-offsets.h 49 50 always += $(offsets-file) 51 targets += arch/$(SRCARCH)/kernel/asm-offsets.s 52 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) 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 65 always += missing-syscalls 66 targets += missing-syscalls 67 68 quiet_cmd_syscalls = CALL $< 69 cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags) 70 71 missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE 72 $(call cmd,syscalls) 73 74 ##### 75 # 5) Generate constants for Python GDB integration 76 # 77 78 extra-$(CONFIG_GDB_SCRIPTS) += build_constants_py 79 80 build_constants_py: $(obj)/$(timeconst-file) $(obj)/$(bounds-file) 81 @$(MAKE) $(build)=scripts/gdb/linux $@ 82 83 # Keep these three files during make clean 84 no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file)
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