forked from Minki/linux
4dfe1bb952
Per Documentation/bpf/bpf_devel_QA.txt add the -target flag to the
sockmap Makefile. Relevant text quoted here,
Otherwise, you can use bpf target. Additionally, you _must_ use
bpf target when:
- Your program uses data structures with pointer or long / unsigned
long types that interface with BPF helpers or context data
structures. Access into these structures is verified by the BPF
verifier and may result in verification failures if the native
architecture is not aligned with the BPF architecture, e.g. 64-bit.
An example of this is BPF_PROG_TYPE_SK_MSG require '-target bpf'
Fixes: 69e8cc134b ("bpf: sockmap sample program")
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
79 lines
2.4 KiB
Makefile
79 lines
2.4 KiB
Makefile
# List of programs to build
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hostprogs-y := sockmap
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# Libbpf dependencies
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LIBBPF := ../../tools/lib/bpf/bpf.o ../../tools/lib/bpf/nlattr.o
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HOSTCFLAGS += -I$(objtree)/usr/include
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HOSTCFLAGS += -I$(srctree)/tools/lib/
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HOSTCFLAGS += -I$(srctree)/tools/testing/selftests/bpf/
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HOSTCFLAGS += -I$(srctree)/tools/lib/ -I$(srctree)/tools/include
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HOSTCFLAGS += -I$(srctree)/tools/perf
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sockmap-objs := ../bpf/bpf_load.o $(LIBBPF) sockmap_user.o
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# Tell kbuild to always build the programs
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always := $(hostprogs-y)
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always += sockmap_kern.o
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HOSTLOADLIBES_sockmap += -lelf -lpthread
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# Allows pointing LLC/CLANG to a LLVM backend with bpf support, redefine on cmdline:
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# make samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang
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LLC ?= llc
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CLANG ?= clang
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# Trick to allow make to be run from this directory
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all:
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$(MAKE) -C ../../ $(CURDIR)/
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clean:
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$(MAKE) -C ../../ M=$(CURDIR) clean
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@rm -f *~
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$(obj)/syscall_nrs.s: $(src)/syscall_nrs.c
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$(call if_changed_dep,cc_s_c)
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$(obj)/syscall_nrs.h: $(obj)/syscall_nrs.s FORCE
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$(call filechk,offsets,__SYSCALL_NRS_H__)
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clean-files += syscall_nrs.h
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FORCE:
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# Verify LLVM compiler tools are available and bpf target is supported by llc
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.PHONY: verify_cmds verify_target_bpf $(CLANG) $(LLC)
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verify_cmds: $(CLANG) $(LLC)
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@for TOOL in $^ ; do \
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if ! (which -- "$${TOOL}" > /dev/null 2>&1); then \
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echo "*** ERROR: Cannot find LLVM tool $${TOOL}" ;\
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exit 1; \
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else true; fi; \
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done
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verify_target_bpf: verify_cmds
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@if ! (${LLC} -march=bpf -mattr=help > /dev/null 2>&1); then \
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echo "*** ERROR: LLVM (${LLC}) does not support 'bpf' target" ;\
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echo " NOTICE: LLVM version >= 3.7.1 required" ;\
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exit 2; \
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else true; fi
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$(src)/*.c: verify_target_bpf
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# asm/sysreg.h - inline assembly used by it is incompatible with llvm.
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# But, there is no easy way to fix it, so just exclude it since it is
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# useless for BPF samples.
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#
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# -target bpf option required with SK_MSG programs, this is to ensure
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# reading 'void *' data types for data and data_end are __u64 reads.
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$(obj)/%.o: $(src)/%.c
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$(CLANG) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(EXTRA_CFLAGS) -I$(obj) \
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-D__KERNEL__ -D__ASM_SYSREG_H -Wno-unused-value -Wno-pointer-sign \
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-Wno-compare-distinct-pointer-types \
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-Wno-gnu-variable-sized-type-not-at-end \
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-Wno-address-of-packed-member -Wno-tautological-compare \
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-Wno-unknown-warning-option -O2 -target bpf \
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-emit-llvm -c $< -o -| $(LLC) -march=bpf -filetype=obj -o $@
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