Commit 9ddd2b8d authored Nov 08, 2023 by Hengqi Chen Committed by Huacai Chen Nov 08, 2023

LoongArch: BPF: Support 32-bit offset jmp instructions



Add support for 32-bit offset jmp instruction. Currently, we use b
instruction which supports range within ±128MB for such jumps. This
should be large enough for BPF progs.

Signed-off-by: Hengqi Chen <hengqi.chen@gmail.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

parent 4ebf9216

arch/loongarch/net/bpf_jit.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -848,7 +848,11 @@ static int build_insn(const struct bpf_insn insn, struct jit_ctx ctx, bool ext

		/* PC += off */
		case BPF_JMP \| BPF_JA:
		case BPF_JMP32 \| BPF_JA:
		if (BPF_CLASS(code) == BPF_JMP)
		jmp_offset = bpf2la_offset(i, off, ctx);
		else
		jmp_offset = bpf2la_offset(i, imm, ctx);
		if (emit_uncond_jmp(ctx, jmp_offset) < 0)
		goto toofar;
		break;