| # 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 |
| |
| $(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) |
| |
| define filechk_gentimeconst |
| (echo $(CONFIG_HZ) | bc -q $< ) |
| endef |
| |
| $(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 |
| |
| arch/$(SRCARCH)/kernel/asm-offsets.s: $(timeconst-file) $(bounds-file) |
| |
| $(offsets-file): arch/$(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: $(timeconst-file) $(bounds-file) |
| @$(MAKE) $(build)=scripts/gdb/linux $@ |
| |
| # Keep these three files during make clean |
| no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file) |
