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