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) check atomics headers are up-to-date 10# 6) Generate constants.py (may need bounds.h) 11 12##### 13# 1) Generate bounds.h 14 15bounds-file := include/generated/bounds.h 16 17always := $(bounds-file) 18targets := kernel/bounds.s 19 20# We use internal kbuild rules to avoid the "is up to date" message from make 21kernel/bounds.s: kernel/bounds.c FORCE 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 $(call if_changed_dep,cc_s_c) 58 59$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE 60 $(call filechk,offsets,__ASM_OFFSETS_H__) 61 62##### 63# 4) Check for missing system calls 64# 65 66always += missing-syscalls 67targets += missing-syscalls 68 69quiet_cmd_syscalls = CALL $< 70 cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags) 71 72missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE 73 $(call cmd,syscalls) 74 75##### 76# 5) Check atomic headers are up-to-date 77# 78 79always += old-atomics 80targets += old-atomics 81 82quiet_cmd_atomics = CALL $< 83 cmd_atomics = $(CONFIG_SHELL) scripts/atomic/check-atomics.sh 84 85old-atomics: scripts/atomic/check-atomics.sh FORCE 86 $(call cmd,atomics) 87 88##### 89# 6) Generate constants for Python GDB integration 90# 91 92extra-$(CONFIG_GDB_SCRIPTS) += build_constants_py 93 94build_constants_py: $(obj)/$(timeconst-file) $(obj)/$(bounds-file) 95 @$(MAKE) $(build)=scripts/gdb/linux $@ 96 97# Keep these three files during make clean 98no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file) 99