1# 2# Kbuild for top-level directory of the kernel 3# This file takes care of the following: 4# 1) Generate bounds.h 5# 2) Generate timeconst.h 6# 3) Generate asm-offsets.h (may need bounds.h and timeconst.h) 7# 4) Check for missing system calls 8# 5) Generate constants.py (may need bounds.h) 9 10##### 11# 1) Generate bounds.h 12 13bounds-file := include/generated/bounds.h 14 15always := $(bounds-file) 16targets := kernel/bounds.s 17 18# We use internal kbuild rules to avoid the "is up to date" message from make 19kernel/bounds.s: kernel/bounds.c FORCE 20 $(call if_changed_dep,cc_s_c) 21 22$(obj)/$(bounds-file): kernel/bounds.s FORCE 23 $(call filechk,offsets,__LINUX_BOUNDS_H__) 24 25##### 26# 2) Generate timeconst.h 27 28timeconst-file := include/generated/timeconst.h 29 30targets += $(timeconst-file) 31 32quiet_cmd_gentimeconst = GEN $@ 33define cmd_gentimeconst 34 (echo $(CONFIG_HZ) | bc -q $< ) > $@ 35endef 36define filechk_gentimeconst 37 (echo $(CONFIG_HZ) | bc -q $< ) 38endef 39 40$(obj)/$(timeconst-file): kernel/time/timeconst.bc FORCE 41 $(call filechk,gentimeconst) 42 43##### 44# 3) Generate asm-offsets.h 45# 46 47offsets-file := include/generated/asm-offsets.h 48 49always += $(offsets-file) 50targets += arch/$(SRCARCH)/kernel/asm-offsets.s 51 52# We use internal kbuild rules to avoid the "is up to date" message from make 53arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \ 54 $(obj)/$(timeconst-file) $(obj)/$(bounds-file) FORCE 55 $(call if_changed_dep,cc_s_c) 56 57$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE 58 $(call filechk,offsets,__ASM_OFFSETS_H__) 59 60##### 61# 4) Check for missing system calls 62# 63 64always += missing-syscalls 65targets += missing-syscalls 66 67quiet_cmd_syscalls = CALL $< 68 cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags) 69 70missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE 71 $(call cmd,syscalls) 72 73##### 74# 5) Generate constants for Python GDB integration 75# 76 77extra-$(CONFIG_GDB_SCRIPTS) += build_constants_py 78 79build_constants_py: $(obj)/$(timeconst-file) $(obj)/$(bounds-file) 80 @$(MAKE) $(build)=scripts/gdb/linux $@ 81 82# Keep these three files during make clean 83no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file) 84