linux-kernel - [PATCH bpf-next v2 4/7] riscv, bpf: Support 32-bit offset jmp insn

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Message-Id: <20230824095001.3408573-5-pulehui@huaweicloud.com>
Date:   Thu, 24 Aug 2023 09:49:58 +0000
From:   Pu Lehui <pulehui@...weicloud.com>
To:     linux-riscv@...ts.infradead.org, bpf@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Björn Töpel <bjorn@...nel.org>,
        Yonghong Song <yhs@...com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Xu Kuohai <xukuohai@...wei.com>,
        Puranjay Mohan <puranjay12@...il.com>,
        Pu Lehui <pulehui@...wei.com>,
        Pu Lehui <pulehui@...weicloud.com>
Subject: [PATCH bpf-next v2 4/7] riscv, bpf: Support 32-bit offset jmp insn

From: Pu Lehui <pulehui@...wei.com>

Add support 32-bit offset jmp instruction for RV64.

Signed-off-by: Pu Lehui <pulehui@...wei.com>
Acked-by: Björn Töpel <bjorn@...nel.org>
---
 arch/riscv/net/bpf_jit_comp64.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/net/bpf_jit_comp64.c b/arch/riscv/net/bpf_jit_comp64.c
index bcf1e7509cb9..076619f4aa82 100644
--- a/arch/riscv/net/bpf_jit_comp64.c
+++ b/arch/riscv/net/bpf_jit_comp64.c
@@ -1327,7 +1327,11 @@ int bpf_jit_emit_insn(const struct bpf_insn *insn, struct rv_jit_context *ctx,
 
 	/* JUMP off */
 	case BPF_JMP | BPF_JA:
-		rvoff = rv_offset(i, off, ctx);
+	case BPF_JMP32 | BPF_JA:
+		if (BPF_CLASS(code) == BPF_JMP)
+			rvoff = rv_offset(i, off, ctx);
+		else
+			rvoff = rv_offset(i, imm, ctx);
 		ret = emit_jump_and_link(RV_REG_ZERO, rvoff, true, ctx);
 		if (ret)
 			return ret;
-- 
2.39.2