Commit 384b6b3b authored by Kumar Kartikeya Dwivedi's avatar Kumar Kartikeya Dwivedi Committed by Alexei Starovoitov
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samples: bpf: Add vmlinux.h generation support 



Also, take this opportunity to depend on in-tree bpftool, so that we can
use static linking support in subsequent commits for XDP samples BPF
helper object.

Signed-off-by: default avatarKumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210821002010.845777-13-memxor@gmail.com
parent af93d58c

samples/bpf/Makefile

+25 −0
Original line number Diff line number Diff line
@@ -276,6 +276,11 @@ $(LIBBPF): FORCE 
	$(MAKE) -C $(dir $@) RM='rm -rf' EXTRA_CFLAGS="$(TPROGS_CFLAGS)" \

		LDFLAGS=$(TPROGS_LDFLAGS) srctree=$(BPF_SAMPLES_PATH)/../../ O=



BPFTOOLDIR := $(TOOLS_PATH)/bpf/bpftool

BPFTOOL := $(BPFTOOLDIR)/bpftool

$(BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile)

	    $(MAKE) -C $(BPFTOOLDIR) srctree=$(BPF_SAMPLES_PATH)/../../



$(obj)/syscall_nrs.h:	$(obj)/syscall_nrs.s FORCE

	$(call filechk,offsets,__SYSCALL_NRS_H__)
@@ -313,6 +318,26 @@ $(obj)/hbm_edt_kern.o: $(src)/hbm.h $(src)/hbm_kern.h 


-include $(BPF_SAMPLES_PATH)/Makefile.target



VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux)				\

		     $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux)	\

		     ../../../../vmlinux				\

		     /sys/kernel/btf/vmlinux				\

		     /boot/vmlinux-$(shell uname -r)

VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))



ifeq ($(VMLINUX_BTF),)

$(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)")

endif



$(obj)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL)

ifeq ($(VMLINUX_H),)

	$(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@

else

	$(Q)cp "$(VMLINUX_H)" $@

endif



clean-files += vmlinux.h



# asm/sysreg.h - inline assembly used by it is incompatible with llvm.

# But, there is no easy way to fix it, so just exclude it since it is

# useless for BPF samples.