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authorAndrii Nakryiko <andriin@fb.com>2020-01-15 11:08:56 -0800
committerAlexei Starovoitov <ast@kernel.org>2020-01-15 11:51:48 -0800
commit9173cac3b64e6785dd604f5075e6035b045a0026 (patch)
tree69fe32b9d326c5adacc059f02a5f653248407108 /tools/testing/selftests/bpf
parentMerge branch 'bpf_send_signal_thread' (diff)
downloadlinux-dev-9173cac3b64e6785dd604f5075e6035b045a0026.tar.xz
linux-dev-9173cac3b64e6785dd604f5075e6035b045a0026.zip
libbpf: Support .text sub-calls relocations
The LLVM patch https://reviews.llvm.org/D72197 makes LLVM emit function call relocations within the same section. This includes a default .text section, which contains any BPF sub-programs. This wasn't the case before and so libbpf was able to get a way with slightly simpler handling of subprogram call relocations. This patch adds support for .text section relocations. It needs to ensure correct order of relocations, so does two passes: - first, relocate .text instructions, if there are any relocations in it; - then process all the other programs and copy over patched .text instructions for all sub-program calls. v1->v2: - break early once .text program is processed. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Yonghong Song <yhs@fb.com> Cc: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200115190856.2391325-1-andriin@fb.com
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