From: Hengqi Chen <hengqi.chen@gmail.com>
To: loongarch@lists.linux.dev, bpf@vger.kernel.org
Cc: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org,
chenhuacai@kernel.org, kernel@xen0n.name, yangtiezhu@loongson.cn,
hengqi.chen@gmail.com
Subject: [PATCH bpf-next 5/8] LoongArch: BPF: Support 32-bit offset jmp instructions
Date: Thu, 26 Oct 2023 18:43:34 +0000 [thread overview]
Message-ID: <20231026184337.563801-6-hengqi.chen@gmail.com> (raw)
In-Reply-To: <20231026184337.563801-1-hengqi.chen@gmail.com>
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>
---
arch/loongarch/net/bpf_jit.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/arch/loongarch/net/bpf_jit.c b/arch/loongarch/net/bpf_jit.c
index a8be6d4b058c..050fcf233a34 100644
--- a/arch/loongarch/net/bpf_jit.c
+++ b/arch/loongarch/net/bpf_jit.c
@@ -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;
--
2.34.1
next prev parent reply other threads:[~2023-10-27 6:01 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-26 18:43 [PATCH bpf-next 0/8] bpf: Support cpu v4 instructions for LoongArch Hengqi Chen
2023-10-26 18:43 ` [PATCH bpf-next 1/8] LoongArch: Add more instruction opcodes and emit_* helpers Hengqi Chen
2023-10-26 18:43 ` [PATCH bpf-next 2/8] LoongArch: BPF: Support sign-extension load instructions Hengqi Chen
2023-10-26 18:43 ` [PATCH bpf-next 3/8] LoongArch: BPF: Support sign-extension mov instructions Hengqi Chen
2023-10-26 18:43 ` [PATCH bpf-next 4/8] LoongArch: BPF: Support unconditional bswap instructions Hengqi Chen
2023-10-26 18:43 ` Hengqi Chen [this message]
2023-10-26 18:43 ` [PATCH bpf-next 6/8] LoongArch: BPF: Support signed div instructions Hengqi Chen
2023-10-26 18:43 ` [PATCH bpf-next 7/8] LoongArch: BPF: Support signed mod instructions Hengqi Chen
2023-10-26 18:43 ` [PATCH bpf-next 8/8] selftests/bpf: Enable cpu v4 tests for LoongArch Hengqi Chen
2023-10-27 7:05 ` Huacai Chen
2023-10-27 8:39 ` Hengqi Chen
2023-10-27 8:42 ` Huacai Chen
2023-10-27 9:41 ` Hengqi Chen
2023-10-27 9:46 ` Huacai Chen
2023-11-09 15:25 ` Huacai Chen
2023-11-11 14:50 ` Hengqi Chen
2023-11-11 16:19 ` Huacai Chen
2023-11-12 2:49 ` Huacai Chen
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