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