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| author | Kumar Kartikeya Dwivedi <memxor@gmail.com> | 2021-08-21 05:50:00 +0530 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2021-08-24 14:48:41 -0700 |
| commit | 384b6b3bbf0d3b60ca118459a91b7b8ce1dcd6bd (patch) | |
| tree | bdf402448dc2390637957be0390fd1f2fd2ad814 /samples/bpf | |
| parent | af93d58c27b6ac4154f1651f47be2a159f8ce30f (diff) | |
| download | linux-384b6b3bbf0d3b60ca118459a91b7b8ce1dcd6bd.tar.bz2 | |
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: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210821002010.845777-13-memxor@gmail.com
Diffstat (limited to 'samples/bpf')
| -rw-r--r-- | samples/bpf/Makefile | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile index 036998d11ded..ff1932e16bc5 100644 --- a/samples/bpf/Makefile +++ b/samples/bpf/Makefile @@ -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. |