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86 lines
2.2 KiB
86 lines
2.2 KiB
# SPDX-License-Identifier: GPL-2.0 |
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# |
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# Kbuild for top-level directory of the kernel |
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# This file takes care of the following: |
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# 1) Generate bounds.h |
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# 2) Generate timeconst.h |
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# 3) Generate asm-offsets.h (may need bounds.h and timeconst.h) |
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# 4) Check for missing system calls |
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# 5) Generate constants.py (may need bounds.h) |
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##### |
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# 1) Generate bounds.h |
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bounds-file := include/generated/bounds.h |
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always := $(bounds-file) |
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targets := kernel/bounds.s |
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# We use internal kbuild rules to avoid the "is up to date" message from make |
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kernel/bounds.s: kernel/bounds.c FORCE |
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$(Q)mkdir -p $(dir $@) |
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$(call if_changed_dep,cc_s_c) |
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$(obj)/$(bounds-file): kernel/bounds.s FORCE |
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$(call filechk,offsets,__LINUX_BOUNDS_H__) |
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##### |
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# 2) Generate timeconst.h |
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timeconst-file := include/generated/timeconst.h |
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targets += $(timeconst-file) |
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quiet_cmd_gentimeconst = GEN $@ |
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define cmd_gentimeconst |
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(echo $(CONFIG_HZ) | bc -q $< ) > $@ |
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endef |
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define filechk_gentimeconst |
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(echo $(CONFIG_HZ) | bc -q $< ) |
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endef |
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$(obj)/$(timeconst-file): kernel/time/timeconst.bc FORCE |
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$(call filechk,gentimeconst) |
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##### |
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# 3) Generate asm-offsets.h |
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# |
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offsets-file := include/generated/asm-offsets.h |
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always += $(offsets-file) |
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targets += arch/$(SRCARCH)/kernel/asm-offsets.s |
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# We use internal kbuild rules to avoid the "is up to date" message from make |
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arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \ |
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$(obj)/$(timeconst-file) $(obj)/$(bounds-file) FORCE |
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$(Q)mkdir -p $(dir $@) |
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$(call if_changed_dep,cc_s_c) |
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$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE |
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$(call filechk,offsets,__ASM_OFFSETS_H__) |
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##### |
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# 4) Check for missing system calls |
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# |
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always += missing-syscalls |
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targets += missing-syscalls |
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quiet_cmd_syscalls = CALL $< |
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cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags) |
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missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE |
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$(call cmd,syscalls) |
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##### |
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# 5) Generate constants for Python GDB integration |
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# |
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extra-$(CONFIG_GDB_SCRIPTS) += build_constants_py |
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build_constants_py: $(obj)/$(timeconst-file) $(obj)/$(bounds-file) |
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@$(MAKE) $(build)=scripts/gdb/linux $@ |
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# Keep these three files during make clean |
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no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file)
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