| | 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) Generate constants.py (may need bounds.h) |
| | 10 | |
| | 11 | ##### |
| | 12 | # 1) Generate bounds.h |
| | 13 | |
| | 14 | bounds-file := include/generated/bounds.h |
| | 15 | |
| | 16 | always := $(bounds-file) |
| | 17 | targets := kernel/bounds.s |
| | 18 | |
| | 19 | # We use internal kbuild rules to avoid the "is up to date" message from make |
| | 20 | kernel/bounds.s: kernel/bounds.c FORCE |
| | 21 | $(Q)mkdir -p $(dir $@) |
| | 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 | |
| | 30 | timeconst-file := include/generated/timeconst.h |
| | 31 | |
| | 32 | targets += $(timeconst-file) |
| | 33 | |
| | 34 | quiet_cmd_gentimeconst = GEN $@ |
| | 35 | define cmd_gentimeconst |
| | 36 | (echo $(CONFIG_HZ) | bc -q $< ) > $@ |
| | 37 | endef |
| | 38 | define filechk_gentimeconst |
| | 39 | (echo $(CONFIG_HZ) | bc -q $< ) |
| | 40 | endef |
| | 41 | |
| | 42 | $(obj)/$(timeconst-file): kernel/time/timeconst.bc FORCE |
| | 43 | $(call filechk,gentimeconst) |
| | 44 | |
| | 45 | ##### |
| | 46 | # 3) Generate asm-offsets.h |
| | 47 | # |
| | 48 | |
| | 49 | offsets-file := include/generated/asm-offsets.h |
| | 50 | |
| | 51 | always += $(offsets-file) |
| | 52 | targets += arch/$(SRCARCH)/kernel/asm-offsets.s |
| | 53 | |
| | 54 | # We use internal kbuild rules to avoid the "is up to date" message from make |
| | 55 | arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \ |
| | 56 | $(obj)/$(timeconst-file) $(obj)/$(bounds-file) FORCE |
| | 57 | $(Q)mkdir -p $(dir $@) |
| | 58 | $(call if_changed_dep,cc_s_c) |
| | 59 | |
| | 60 | $(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE |
| | 61 | $(call filechk,offsets,__ASM_OFFSETS_H__) |
| | 62 | |
| | 63 | ##### |
| | 64 | # 4) Check for missing system calls |
| | 65 | # |
| | 66 | |
| | 67 | always += missing-syscalls |
| | 68 | targets += missing-syscalls |
| | 69 | |
| | 70 | quiet_cmd_syscalls = CALL $< |
| | 71 | cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags) |
| | 72 | |
| | 73 | missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE |
| | 74 | $(call cmd,syscalls) |
| | 75 | |
| | 76 | ##### |
| | 77 | # 5) Generate constants for Python GDB integration |
| | 78 | # |
| | 79 | |
| | 80 | extra-$(CONFIG_GDB_SCRIPTS) += build_constants_py |
| | 81 | |
| | 82 | build_constants_py: $(obj)/$(timeconst-file) $(obj)/$(bounds-file) |
| | 83 | @$(MAKE) $(build)=scripts/gdb/linux $@ |
| | 84 | |
| | 85 | # Keep these three files during make clean |
| | 86 | no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file) |
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