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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: bpf-bounces@ietf.org Sender: "Bpf" > On 2/12/24 1:52 PM, dthaler1968@googlemail.com wrote: >>> -----Original Message----- >>> From: Yonghong Song >>> Sent: Monday, February 12, 2024 1:49 PM >>> To: Jose E. Marchesi ; Dave Thaler >>> >>> Cc: bpf@vger.kernel.org; bpf@ietf.org; Dave Thaler >>> >>> Subject: Re: [Bpf] [PATCH bpf-next v2] bpf, docs: Add callx instructions in new >>> conformance group >>> >>> >>> On 2/12/24 1:28 PM, Jose E. Marchesi wrote: >>>>> +BPF_CALL 0x8 0x1 call PC += reg_val(imm) BPF_JMP | BPF_X >>> only, see `Program-local functions`_ >>>> If the instruction requires a register operand, why not using one of >>>> the register fields? Is there any reason for not doing that? >>> Talked to Alexei and we think using dst_reg for the register for callx insn is >>> better. I will craft a llvm patch for this today. Thanks! >> Why dst_reg instead of src_reg? >> BPF_X is supposed to mean use src_reg. > > Let us use dst_reg. Currently, for BPF_K, we have src_reg for a bunch > of flags (pseudo call, kfunc call, etc.). So for BPF_X, let us preserve this > property as well in case in the future we will introduce variants for > callx. The following is the llvm diff: > > https://github.com/llvm/llvm-project/pull/81546 Thank you. I believe Will will be sending a patch to binutils to change the pseudo-C syntax for the instruction to callx instead of callr. We will then adapt GCC accordingly, and both compilers will be doing exactly the same regarding callx. >> >> But this thread is about reserving/documenting the existing practice, >> since anyone trying to use it would run into interop issues because >> of existing clang. Should we document both and list one as deprecated? > > I think just documenting the new encoding is good enough. 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Marchesi" To: Yonghong Song Cc: dthaler1968@googlemail.com, 'Dave Thaler' , bpf@vger.kernel.org, bpf@ietf.org Subject: Re: [Bpf] [PATCH bpf-next v2] bpf, docs: Add callx instructions in new conformance group In-Reply-To: (Yonghong Song's message of "Mon, 12 Feb 2024 14:48:53 -0800") References: <20240212211310.8282-1-dthaler1968@gmail.com> <87le7ptlsq.fsf@oracle.com> <036301da5dfd$be7d1b30$3b775190$@gmail.com> Date: Tue, 13 Feb 2024 07:11:05 +0100 Message-ID: <87zfw4sxl2.fsf@oracle.com> User-Agent: Gnus/5.13 (Gnus v5.13) Content-Type: text/plain X-ClientProxiedBy: FR5P281CA0028.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:f1::10) To BN8PR10MB3107.namprd10.prod.outlook.com (2603:10b6:408:c2::18) Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN8PR10MB3107:EE_|BL3PR10MB6065:EE_ X-MS-Office365-Filtering-Correlation-Id: ff4bd2e4-4083-4a11-fe29-08dc2c5a9222 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Marchesi ; Dave Thaler >>> >>> Cc: bpf@vger.kernel.org; bpf@ietf.org; Dave Thaler >>> >>> Subject: Re: [Bpf] [PATCH bpf-next v2] bpf, docs: Add callx instructions in new >>> conformance group >>> >>> >>> On 2/12/24 1:28 PM, Jose E. Marchesi wrote: >>>>> +BPF_CALL 0x8 0x1 call PC += reg_val(imm) BPF_JMP | BPF_X >>> only, see `Program-local functions`_ >>>> If the instruction requires a register operand, why not using one of >>>> the register fields? Is there any reason for not doing that? >>> Talked to Alexei and we think using dst_reg for the register for callx insn is >>> better. I will craft a llvm patch for this today. Thanks! >> Why dst_reg instead of src_reg? >> BPF_X is supposed to mean use src_reg. > > Let us use dst_reg. Currently, for BPF_K, we have src_reg for a bunch > of flags (pseudo call, kfunc call, etc.). So for BPF_X, let us preserve this > property as well in case in the future we will introduce variants for > callx. The following is the llvm diff: > > https://github.com/llvm/llvm-project/pull/81546 Thank you. I believe Will will be sending a patch to binutils to change the pseudo-C syntax for the instruction to callx instead of callr. We will then adapt GCC accordingly, and both compilers will be doing exactly the same regarding callx. >> >> But this thread is about reserving/documenting the existing practice, >> since anyone trying to use it would run into interop issues because >> of existing clang. Should we document both and list one as deprecated? > > I think just documenting the new encoding is good enough. But other > people can chime in just in case that I missed something. > >> >> Dave >>