diff options
Diffstat (limited to 'Kbuild')
| -rw-r--r-- | Kbuild | 84 |
1 files changed, 84 insertions, 0 deletions
@@ -0,0 +1,84 @@ +# 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) |