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([2620:10d:c090:600::1:2404]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-74ce43d69f8sm13128083b3a.179.2025.07.08.14.29.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Jul 2025 14:29:53 -0700 (PDT) Message-ID: <73eb0615eba70efd79407eda4c2025634edcb75b.camel@gmail.com> Subject: Re: [RFC bpf-next 8/9] libbpf: support llvm-generated indirect jumps From: Eduard Zingerman To: Alexei Starovoitov Cc: Anton Protopopov , bpf , Alexei Starovoitov , Andrii Nakryiko , Anton Protopopov , Daniel Borkmann , Quentin Monnet , Yonghong Song Date: Tue, 08 Jul 2025 14:29:52 -0700 In-Reply-To: References: <20250615085943.3871208-1-a.s.protopopov@gmail.com> <20250615085943.3871208-9-a.s.protopopov@gmail.com> <690335c5969530cb96ed9b968ce7371fb1f0228a.camel@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2 (3.56.2-1.fc42) Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Tue, 2025-07-08 at 14:25 -0700, Alexei Starovoitov wrote: [...] > > LLVM would produce: > >=20 > > 0000000000000000 : > > ... > > 1: w1 =3D w1 > > 2: r1 <<=3D 0x3 >=20 > If we go this route, let's drop this *8 and make it an index ? > Less checks in the verifier... >=20 > > 3: gotox r1 > > 0000000000000038: R_BPF_64_64 .BPF.JT.0.0 Makes sense to me. 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