blob: 94c752762bc26530f8024162140c9da9d08b5167
| 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 | |
| 13 | bounds-file := include/generated/bounds.h |
| 14 | |
| 15 | always := $(bounds-file) |
| 16 | targets := kernel/bounds.s |
| 17 | |
| 18 | # We use internal kbuild rules to avoid the "is up to date" message from make |
| 19 | kernel/bounds.s: kernel/bounds.c FORCE |
| 20 | $(Q)mkdir -p $(dir $@) |
| 21 | $(call if_changed_dep,cc_s_c) |
| 22 | |
| 23 | $(obj)/$(bounds-file): kernel/bounds.s FORCE |
| 24 | $(call filechk,offsets,__LINUX_BOUNDS_H__) |
| 25 | |
| 26 | ##### |
| 27 | # 2) Generate timeconst.h |
| 28 | |
| 29 | timeconst-file := include/generated/timeconst.h |
| 30 | |
| 31 | targets += $(timeconst-file) |
| 32 | |
| 33 | quiet_cmd_gentimeconst = GEN $@ |
| 34 | define cmd_gentimeconst |
| 35 | (echo $(CONFIG_HZ) | bc -q $< ) > $@ |
| 36 | endef |
| 37 | define filechk_gentimeconst |
| 38 | (echo $(CONFIG_HZ) | bc -q $< ) |
| 39 | endef |
| 40 | |
| 41 | $(obj)/$(timeconst-file): kernel/time/timeconst.bc FORCE |
| 42 | $(call filechk,gentimeconst) |
| 43 | |
| 44 | ##### |
| 45 | # 3) Generate asm-offsets.h |
| 46 | # |
| 47 | |
| 48 | offsets-file := include/generated/asm-offsets.h |
| 49 | |
| 50 | always += $(offsets-file) |
| 51 | targets += arch/$(SRCARCH)/kernel/asm-offsets.s |
| 52 | |
| 53 | # We use internal kbuild rules to avoid the "is up to date" message from make |
| 54 | arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \ |
| 55 | $(obj)/$(timeconst-file) $(obj)/$(bounds-file) FORCE |
| 56 | $(Q)mkdir -p $(dir $@) |
| 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 | |
| 66 | always += missing-syscalls |
| 67 | targets += missing-syscalls |
| 68 | |
| 69 | quiet_cmd_syscalls = CALL $< |
| 70 | cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags) |
| 71 | |
| 72 | missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE |
| 73 | $(call cmd,syscalls) |
| 74 | |
| 75 | ##### |
| 76 | # 5) Generate constants for Python GDB integration |
| 77 | # |
| 78 | |
| 79 | extra-$(CONFIG_GDB_SCRIPTS) += build_constants_py |
| 80 | |
| 81 | build_constants_py: $(obj)/$(timeconst-file) $(obj)/$(bounds-file) |
| 82 | @$(MAKE) $(build)=scripts/gdb/linux $@ |
| 83 | |
| 84 | # Keep these three files during make clean |
| 85 | no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file) |
| 86 |