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LoongArch: BPF: Support 32-bit offset jmp instructions

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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>
This commit is contained in:
Hengqi Chen 2023-11-08 14:12:16 +08:00 committed by Huacai Chen
parent 4ebf9216e7
commit 9ddd2b8d1a
1 changed files with 5 additions and 1 deletions
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6
arch/loongarch/net/bpf_jit.c
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@ -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:
jmp_offset = bpf2la_offset(i, off, ctx);
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;