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2 commits

Author SHA1 Message Date
Eduard Zingerman
203e6aba76 selftests/bpf: print correct offset for pseudo calls in disasm_insn()
Adjust disasm_helpers.c:disasm_insn() to account for the following
part of the verifier.c:jit_subprogs:

  for (i = 0, insn = prog->insnsi; i < prog->len; i++, insn++) {
        /* ... */
        if (!bpf_pseudo_call(insn))
                continue;
        insn->off = env->insn_aux_data[i].call_imm;
        subprog = find_subprog(env, i + insn->off + 1);
        insn->imm = subprog;
  }

Where verifier moves offset of the subprogram to the insn->off field.

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20240722233844.1406874-6-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
2024-07-29 15:05:06 -07:00
Eduard Zingerman
424ebaa367 selftests/bpf: extract utility function for BPF disassembly
struct bpf_insn *disasm_insn(struct bpf_insn *insn, char *buf, size_t buf_sz);

  Disassembles instruction 'insn' to a text buffer 'buf'.
  Removes insn->code hex prefix added by kernel disassembly routine.
  Returns a pointer to the next instruction
  (increments insn by either 1 or 2).

Acked-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20240722233844.1406874-5-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
2024-07-29 15:05:05 -07:00