Eric Lee / smarc-fsl-linux-kernel

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81f7e3824   Eric Lee   Initial Release, ... 
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  # SPDX-License-Identifier: GPL-2.0
  #
  # Kbuild for top-level directory of the kernel
  # This file takes care of the following:
  # 1) Generate bounds.h
  # 2) Generate timeconst.h
  # 3) Generate asm-offsets.h (may need bounds.h and timeconst.h)
  # 4) Check for missing system calls
  # 5) Generate constants.py (may need bounds.h)
  
  #####
  # 1) Generate bounds.h
  
  bounds-file := include/generated/bounds.h
  
  always  := $(bounds-file)
  targets := kernel/bounds.s
  
  # We use internal kbuild rules to avoid the "is up to date" message from make
  kernel/bounds.s: kernel/bounds.c FORCE
  	$(Q)mkdir -p $(dir $@)
  	$(call if_changed_dep,cc_s_c)
  
  $(obj)/$(bounds-file): kernel/bounds.s FORCE
  	$(call filechk,offsets,__LINUX_BOUNDS_H__)
  
  #####
  # 2) Generate timeconst.h
  
  timeconst-file := include/generated/timeconst.h
  
  targets += $(timeconst-file)
  
  quiet_cmd_gentimeconst = GEN     $@
  define cmd_gentimeconst
  	(echo $(CONFIG_HZ) | bc -q $< ) > $@
  endef
  define filechk_gentimeconst
  	(echo $(CONFIG_HZ) | bc -q $< )
  endef
  
  $(obj)/$(timeconst-file): kernel/time/timeconst.bc FORCE
  	$(call filechk,gentimeconst)
  
  #####
  # 3) Generate asm-offsets.h
  #
  
  offsets-file := include/generated/asm-offsets.h
  
  always  += $(offsets-file)
  targets += arch/$(SRCARCH)/kernel/asm-offsets.s
  
  # We use internal kbuild rules to avoid the "is up to date" message from make
  arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \
                                        $(obj)/$(timeconst-file) $(obj)/$(bounds-file) FORCE
  	$(Q)mkdir -p $(dir $@)
  	$(call if_changed_dep,cc_s_c)
  
  $(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE
  	$(call filechk,offsets,__ASM_OFFSETS_H__)
  
  #####
  # 4) Check for missing system calls
  #
  
  always += missing-syscalls
  targets += missing-syscalls
  
  quiet_cmd_syscalls = CALL    $<
        cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)
  
  missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE
  	$(call cmd,syscalls)
  
  #####
  # 5) Generate constants for Python GDB integration
  #
  
  extra-$(CONFIG_GDB_SCRIPTS) += build_constants_py
  
  build_constants_py: $(obj)/$(timeconst-file) $(obj)/$(bounds-file)
  	@$(MAKE) $(build)=scripts/gdb/linux $@
  
  # Keep these three files during make clean
  no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file)