From: Xu Kuohai <xukuohai@xxxxxxxxxx> Add support for 32-bit offset jmp instructions. Given the arm64 direct jump range is +-128MB, which is large enough for BPF prog, jumps beyond this range are not supported. Signed-off-by: Xu Kuohai <xukuohai@xxxxxxxxxx> --- arch/arm64/net/bpf_jit_comp.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c index 1d35acb880dc..924b8ef2e46a 100644 --- a/arch/arm64/net/bpf_jit_comp.c +++ b/arch/arm64/net/bpf_jit_comp.c @@ -982,7 +982,11 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, /* JUMP off */ case BPF_JMP | BPF_JA: - jmp_offset = bpf2a64_offset(i, off, ctx); + case BPF_JMP32 | BPF_JA: + if (BPF_CLASS(code) == BPF_JMP) + jmp_offset = bpf2a64_offset(i, off, ctx); + else + jmp_offset = bpf2a64_offset(i, imm, ctx); check_imm26(jmp_offset); emit(A64_B(jmp_offset), ctx); break; -- 2.30.2
