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Tue, 28 Oct 2025 07:15:15 -0700 (PDT) Received: from localhost.localdomain ([2a04:ee41:4:b2de:1ac0:4dff:fe0f:3782]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-429952d4494sm20867060f8f.21.2025.10.28.07.15.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 28 Oct 2025 07:15:15 -0700 (PDT) From: Anton Protopopov To: bpf@vger.kernel.org, Alexei Starovoitov , Andrii Nakryiko , Anton Protopopov , Daniel Borkmann , Eduard Zingerman , Quentin Monnet , Yonghong Song Cc: Anton Protopopov Subject: [PATCH v8 bpf-next 07/11] bpf: disasm: add support for BPF_JMP|BPF_JA|BPF_X Date: Tue, 28 Oct 2025 14:20:45 +0000 Message-Id: <20251028142049.1324520-8-a.s.protopopov@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20251028142049.1324520-1-a.s.protopopov@gmail.com> References: <20251028142049.1324520-1-a.s.protopopov@gmail.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add support for indirect jump instruction. Example output from bpftool: 0: (79) r3 = *(u64 *)(r1 +0) 1: (25) if r3 > 0x4 goto pc+666 2: (67) r3 <<= 3 3: (18) r1 = 0xffffbeefspameggs 5: (0f) r1 += r3 6: (79) r1 = *(u64 *)(r1 +0) 7: (0d) gotox r1 Signed-off-by: Anton Protopopov Acked-by: Eduard Zingerman --- kernel/bpf/disasm.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/bpf/disasm.c b/kernel/bpf/disasm.c index 20883c6b1546..f8a3c7eb451e 100644 --- a/kernel/bpf/disasm.c +++ b/kernel/bpf/disasm.c @@ -358,6 +358,9 @@ void print_bpf_insn(const struct bpf_insn_cbs *cbs, } else if (insn->code == (BPF_JMP | BPF_JA)) { verbose(cbs->private_data, "(%02x) goto pc%+d\n", insn->code, insn->off); + } else if (insn->code == (BPF_JMP | BPF_JA | BPF_X)) { + verbose(cbs->private_data, "(%02x) gotox r%d\n", + insn->code, insn->dst_reg); } else if (insn->code == (BPF_JMP | BPF_JCOND) && insn->src_reg == BPF_MAY_GOTO) { verbose(cbs->private_data, "(%02x) may_goto pc%+d\n", -- 2.34.1