Commit ffc88174 authored Nov 20, 2019 by Andrii Nakryiko Committed by Alexei Starovoitov Nov 24, 2019

selftests/bpf: Ensure no DWARF relocations for BPF object files



Add -mattr=dwarfris attribute to llc to avoid having relocations against DWARF
data. These relocations make it impossible to inspect DWARF contents: all
strings are invalid.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20191121070743.1309473-2-andriin@fb.com

parent a8fdaad5

tools/testing/selftests/bpf/Makefile

+1 −1

Original line number	Diff line number	Diff line
		@@ -161,7 +161,7 @@ $(OUTPUT)/flow_dissector_load.o: flow_dissector_load.h
		define CLANG_BPF_BUILD_RULE
		($(CLANG) $3 -O2 -target bpf -emit-llvm \
		-c $1 -o - \|\| echo "BPF obj compilation failed") \| \
		$(LLC) -march=bpf -mcpu=probe $4 -filetype=obj -o $2
		$(LLC) -mattr=dwarfris -march=bpf -mcpu=probe $4 -filetype=obj -o $2
		endef
		# Similar to CLANG_BPF_BUILD_RULE, but with disabled alu32
		define CLANG_NOALU32_BPF_BUILD_RULE

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