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 := $(bounds-file) 17targets := kernel/bounds.s 18 19$(obj)/$(bounds-file): kernel/bounds.s FORCE 20 $(call filechk,offsets,__LINUX_BOUNDS_H__) 21 22##### 23# 2) Generate timeconst.h 24 25timeconst-file := include/generated/timeconst.h 26 27targets += $(timeconst-file) 28 29quiet_cmd_gentimeconst = GEN $@ 30define cmd_gentimeconst 31 (echo $(CONFIG_HZ) | bc -q $< ) > $@ 32endef 33define filechk_gentimeconst 34 (echo $(CONFIG_HZ) | bc -q $< ) 35endef 36 37$(obj)/$(timeconst-file): kernel/time/timeconst.bc FORCE 38 $(call filechk,gentimeconst) 39 40##### 41# 3) Generate asm-offsets.h 42# 43 44offsets-file := include/generated/asm-offsets.h 45 46always += $(offsets-file) 47targets += arch/$(SRCARCH)/kernel/asm-offsets.s 48 49arch/$(SRCARCH)/kernel/asm-offsets.s: $(obj)/$(timeconst-file) $(obj)/$(bounds-file) 50 51$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE 52 $(call filechk,offsets,__ASM_OFFSETS_H__) 53 54##### 55# 4) Check for missing system calls 56# 57 58always += missing-syscalls 59targets += missing-syscalls 60 61quiet_cmd_syscalls = CALL $< 62 cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags) 63 64missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE 65 $(call cmd,syscalls) 66 67##### 68# 5) Generate constants for Python GDB integration 69# 70 71extra-$(CONFIG_GDB_SCRIPTS) += build_constants_py 72 73build_constants_py: $(obj)/$(timeconst-file) $(obj)/$(bounds-file) 74 @$(MAKE) $(build)=scripts/gdb/linux $@ 75 76# Keep these three files during make clean 77no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file) 78