net/bpfilter/Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 #
   3 # Makefile for the Linux BPFILTER layer.
   4 #
   5
   6 hostprogs-y := bpfilter_umh
   7 bpfilter_umh-objs := main.o
   8 HOSTCFLAGS += -I. -Itools/include/ -Itools/include/uapi
   9 HOSTCC := $(CC)
  10
  11 ifeq ($(CONFIG_BPFILTER_UMH), y)
  12 # builtin bpfilter_umh should be compiled with -static
  13 # since rootfs isn't mounted at the time of __init
  14 # function is called and do_execv won't find elf interpreter
  15 HOSTLDFLAGS += -static
  16 endif
  17
  18 # a bit of elf magic to convert bpfilter_umh binary into a binary blob
  19 # inside bpfilter_umh.o elf file referenced by
  20 # _binary_net_bpfilter_bpfilter_umh_start symbol
  21 # which bpfilter_kern.c passes further into umh blob loader at run-time
  22 quiet_cmd_copy_umh = GEN $@
  23       cmd_copy_umh = echo ':' > $(obj)/.bpfilter_umh.o.cmd; \
  24       $(OBJCOPY) -I binary \
  25           `LC_ALL=C $(OBJDUMP) -f net/bpfilter/bpfilter_umh \
  26           |awk -F' |,' '/file format/{print "-O",$$NF} \
  27           /^architecture:/{print "-B",$$2}'` \
  28       --rename-section .data=.init.rodata $< $@
  29
  30 $(obj)/bpfilter_umh.o: $(obj)/bpfilter_umh
  31         $(call cmd,copy_umh)
  32
  33 obj-$(CONFIG_BPFILTER_UMH) += bpfilter.o
  34 bpfilter-objs += bpfilter_kern.o bpfilter_umh.o