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# We use internal kbuild rules to avoid the "is up to date" message from make 20kernel/bounds.s: kernel/bounds.c FORCE 21 $(Q)mkdir -p $(dir $@) 22 $(call if_changed_dep,cc_s_c) 23 24$(obj)/$(bounds-file): kernel/bounds.s FORCE 25 $(call filechk,offsets,__LINUX_BOUNDS_H__) 26 27##### 28# 2) Generate timeconst.h 29 30timeconst-file := include/generated/timeconst.h 31 32targets += $(timeconst-file) 33 34quiet_cmd_gentimeconst = GEN $@ 35define cmd_gentimeconst 36 (echo $(CONFIG_HZ) | bc -q $< ) > $@ 37endef 38define filechk_gentimeconst 39 (echo $(CONFIG_HZ) | bc -q $< ) 40endef 41 42$(obj)/$(timeconst-file): kernel/time/timeconst.bc FORCE 43 $(call filechk,gentimeconst) 44 45##### 46# 3) Generate asm-offsets.h 47# 48 49offsets-file := include/generated/asm-offsets.h 50 51always += $(offsets-file) 52targets += arch/$(SRCARCH)/kernel/asm-offsets.s 53 54# We use internal kbuild rules to avoid the "is up to date" message from make 55arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \ 56 $(obj)/$(timeconst-file) $(obj)/$(bounds-file) FORCE 57 $(Q)mkdir -p $(dir $@) 58 $(call if_changed_dep,cc_s_c) 59 60$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE 61 $(call filechk,offsets,__ASM_OFFSETS_H__) 62 63##### 64# 4) Check for missing system calls 65# 66 67always += missing-syscalls 68targets += missing-syscalls 69 70quiet_cmd_syscalls = CALL $< 71 cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags) 72 73missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE 74 $(call cmd,syscalls) 75 76##### 77# 5) Generate constants for Python GDB integration 78# 79 80extra-$(CONFIG_GDB_SCRIPTS) += build_constants_py 81 82build_constants_py: $(obj)/$(timeconst-file) $(obj)/$(bounds-file) 83 @$(MAKE) $(build)=scripts/gdb/linux $@ 84 85# Keep these three files during make clean 86no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file) 87