| # SPDX-License-Identifier: GPL-2.0 | |
| # | |
| # Kbuild for top-level directory of the kernel | |
| # This file takes care of the following: | |
| # 1) Generate bounds.h | |
| # 2) Generate timeconst.h | |
| # 3) Generate asm-offsets.h (may need bounds.h and timeconst.h) | |
| # 4) Check for missing system calls | |
| # 5) Generate constants.py (may need bounds.h) | |
| ##### | |
| # 1) Generate bounds.h | |
| bounds-file := include/generated/bounds.h | |
| always := $(bounds-file) | |
| targets := kernel/bounds.s | |
| # We use internal kbuild rules to avoid the "is up to date" message from make | |
| kernel/bounds.s: kernel/bounds.c FORCE | |
| $(call if_changed_dep,cc_s_c) | |
| $(obj)/$(bounds-file): kernel/bounds.s FORCE | |
| $(call filechk,offsets,__LINUX_BOUNDS_H__) | |
| ##### | |
| # 2) Generate timeconst.h | |
| timeconst-file := include/generated/timeconst.h | |
| targets += $(timeconst-file) | |
| quiet_cmd_gentimeconst = GEN $@ | |
| define cmd_gentimeconst | |
| (echo $(CONFIG_HZ) | bc -q $< ) > $@ | |
| endef | |
| define filechk_gentimeconst | |
| (echo $(CONFIG_HZ) | bc -q $< ) | |
| endef | |
| $(obj)/$(timeconst-file): kernel/time/timeconst.bc FORCE | |
| $(call filechk,gentimeconst) | |
| ##### | |
| # 3) Generate asm-offsets.h | |
| # | |
| offsets-file := include/generated/asm-offsets.h | |
| always += $(offsets-file) | |
| targets += arch/$(SRCARCH)/kernel/asm-offsets.s | |
| # We use internal kbuild rules to avoid the "is up to date" message from make | |
| arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \ | |
| $(obj)/$(timeconst-file) $(obj)/$(bounds-file) FORCE | |
| $(call if_changed_dep,cc_s_c) | |
| $(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE | |
| $(call filechk,offsets,__ASM_OFFSETS_H__) | |
| ##### | |
| # 4) Check for missing system calls | |
| # | |
| always += missing-syscalls | |
| targets += missing-syscalls | |
| quiet_cmd_syscalls = CALL $< | |
| cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags) | |
| missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE | |
| $(call cmd,syscalls) | |
| ##### | |
| # 5) Generate constants for Python GDB integration | |
| # | |
| extra-$(CONFIG_GDB_SCRIPTS) += build_constants_py | |
| build_constants_py: $(obj)/$(timeconst-file) $(obj)/$(bounds-file) | |
| @$(MAKE) $(build)=scripts/gdb/linux $@ | |
| # Keep these three files during make clean | |
| no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file) |