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| author | Quentin Monnet <quentin@isovalent.com> | 2023-04-05 14:21:15 +0100 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2023-04-05 21:27:27 -0700 |
| commit | 67cf52cdb6c8fa6365d29106555dacf95c9fd374 (patch) | |
| tree | 93e32ee4cc379b39b8c7af574183c8477cd05745 /tools/bpf | |
| parent | e27f0f1620b693ecf312c21ff8a52affb8a5be08 (diff) | |
| download | linux-67cf52cdb6c8fa6365d29106555dacf95c9fd374.tar.gz | |
bpftool: Fix bug for long instructions in program CFG dumps
When dumping the control flow graphs for programs using the 16-byte long
load instruction, we need to skip the second part of this instruction
when looking for the next instruction to process. Otherwise, we end up
printing "BUG_ld_00" from the kernel disassembler in the CFG.
Fixes: efcef17a6d65 ("tools: bpftool: generate .dot graph from CFG information")
Signed-off-by: Quentin Monnet <quentin@isovalent.com>
Link: https://lore.kernel.org/r/20230405132120.59886-3-quentin@isovalent.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'tools/bpf')
| -rw-r--r-- | tools/bpf/bpftool/xlated_dumper.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/tools/bpf/bpftool/xlated_dumper.c b/tools/bpf/bpftool/xlated_dumper.c index 6fe3134ae45d..3daa05d9bbb7 100644 --- a/tools/bpf/bpftool/xlated_dumper.c +++ b/tools/bpf/bpftool/xlated_dumper.c @@ -372,8 +372,15 @@ void dump_xlated_for_graph(struct dump_data *dd, void *buf_start, void *buf_end, struct bpf_insn *insn_start = buf_start; struct bpf_insn *insn_end = buf_end; struct bpf_insn *cur = insn_start; + bool double_insn = false; for (; cur <= insn_end; cur++) { + if (double_insn) { + double_insn = false; + continue; + } + double_insn = cur->code == (BPF_LD | BPF_IMM | BPF_DW); + printf("% 4d: ", (int)(cur - insn_start + start_idx)); print_bpf_insn(&cbs, cur, true); if (cur != insn_end) |