From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from aserp2130.oracle.com (aserp2130.oracle.com [141.146.126.79]) by sourceware.org (Postfix) with ESMTPS id 6935A3959C34 for ; Tue, 9 Mar 2021 10:04:27 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 6935A3959C34 Received: from pps.filterd (aserp2130.oracle.com [127.0.0.1]) by aserp2130.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 1299tTTu164781 for ; Tue, 9 Mar 2021 10:04:26 GMT Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by aserp2130.oracle.com with ESMTP id 373y8bpv63-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Tue, 09 Mar 2021 10:04:26 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 1299pOvR185154 for ; Tue, 9 Mar 2021 10:04:26 GMT Received: from nam12-dm6-obe.outbound.protection.outlook.com (mail-dm6nam12lp2176.outbound.protection.outlook.com [104.47.59.176]) by userp3030.oracle.com with ESMTP id 374knwkxyc-3 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Tue, 09 Mar 2021 10:04:25 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=AGHF8he1oDDE3akBWmGL6XQZT08jsZYVuYt4HDH5zbZiUybHw46T5XO66yqiK3IDPgiv8W2VgQ0wo1dteGqVd1/KibOAfBBK57lm2x7CpED2WhBoE+GiEs3VVcz4AL/onwIQ97sEdLsTpPClu2JXl0L86jJ8smm3YZGsI9ZNOB51DZw6kOTrD3PY3GdIJ5mL2Vwrs00C1b19/HqDK3fkxDtk3k8pcs1shsLgSUMbzsWkt1x9OY917h/OoSMM0ttDZtcTdY5SA0McyDJwX8eFnjlu/aTfPaHWKO/bmhPDH4sg6VYf5sXKRwz616Vuuc6/y5ZSsKrq2O6o8M8X9FrU7Q== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=Y9f9To79ZUp6tElSav16fd7jK49GMof4Rg4TItznfSw=; b=fZJGC/hxrqX4Uwbn88Pu36DiiciJU2EiXZW/76zKw9CUXQ6iDBUDBbuhmj1piUcvDZVDGTlWercvCyc6DpvT8SoY/6IaaIcHxu9M00kwGVwSJ4axH+pEy18nq6/aYb+STd0tOZLpxp/7nJEsE4n74PzO++prGM/RpAF8KMY+fesRE2O/xQ7CijaFzAe8PIHVNAs0nSJq4B4t2rAeK5MD4XLebcGWbac7PelTQsGEH3jZaViQc5hTsftUKAyJzc32x/btxYvHrGBSWKwN/qxpRAjPwgkObny22DrpkZKorI0qQlLh5qhaYJqnUvNshwYPKKsNK2/2J+N0GyLSkDpu2w== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=oracle.com; dmarc=pass action=none header.from=oracle.com; dkim=pass header.d=oracle.com; arc=none Received: from DM5PR10MB2041.namprd10.prod.outlook.com (2603:10b6:3:111::16) by DM5PR10MB1675.namprd10.prod.outlook.com (2603:10b6:4:e::10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3890.28; Tue, 9 Mar 2021 10:04:23 +0000 Received: from DM5PR10MB2041.namprd10.prod.outlook.com ([fe80::35f2:ac4c:f8c0:ee4]) by DM5PR10MB2041.namprd10.prod.outlook.com ([fe80::35f2:ac4c:f8c0:ee4%7]) with mapi id 15.20.3912.027; Tue, 9 Mar 2021 10:04:22 +0000 From: "Jose E. Marchesi" To: gcc-patches@gcc.gnu.org Subject: [PATCH V4 5/5] Enable BTF generation in the BPF backend Date: Tue, 9 Mar 2021 11:04:02 +0100 Message-Id: <20210309100402.16632-6-jose.marchesi@oracle.com> X-Mailer: git-send-email 2.25.0.2.g232378479e In-Reply-To: <20210309100402.16632-1-jose.marchesi@oracle.com> References: <20210309100402.16632-1-jose.marchesi@oracle.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [141.143.193.72] X-ClientProxiedBy: LO2P265CA0242.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:8a::14) To DM5PR10MB2041.namprd10.prod.outlook.com (2603:10b6:3:111::16) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from termi.localdomain (141.143.193.72) by LO2P265CA0242.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:8a::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3912.17 via Frontend Transport; Tue, 9 Mar 2021 10:04:22 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 29c4bbc3-11b8-4fac-964b-08d8e2e2b6a2 X-MS-TrafficTypeDiagnostic: DM5PR10MB1675: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:10000; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:DM5PR10MB2041.namprd10.prod.outlook.com; PTR:; CAT:NONE; SFS:(376002)(136003)(396003)(366004)(346002)(39860400002)(26005)(5660300002)(316002)(6666004)(86362001)(1076003)(8676002)(478600001)(83380400001)(16526019)(186003)(956004)(2616005)(2906002)(8936002)(6486002)(6916009)(6506007)(36756003)(66946007)(66556008)(66476007)(6512007)(52116002); DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData: =?us-ascii?Q?IFOgT/jfkNk4N2GNhWvnoNv2Z2ZHXDXRlmjTWDu5XaM8O7HEPRW2zfkQVFA6?= =?us-ascii?Q?Lka9pIqljW2gelMb0oEATXm770eJpjs0ZrdLFgemQIf26+XZNk44u+6LyDAv?= =?us-ascii?Q?zrNFIZRprjbYlpPn+MeyXmiP/RNbfUSFjOweQ1MxH9RcLrsBtrNynTSagArH?= =?us-ascii?Q?PXqT8UYxjHyQIKOvXVwuC0l0kqb4mGePARMdmpbtIEKO62ga5l9+NL4JvKJe?= =?us-ascii?Q?78ziK790QVYdE2zTmDuFIM77M7n1F4qeb0gZdwmDksSayomK67c2T4kZnX8v?= =?us-ascii?Q?8G0NUGPTfRd1rQBWD5uPE1VPmlhh5yRMYZzG2vW9pBodrh2luxO7opogVIxG?= =?us-ascii?Q?zH7bIwm8zeMIv8FaxUDNHeVsViMOCZHbiWDHUSnGUn1/yQeBrACrbJmJBLHo?= =?us-ascii?Q?nOlnB8tr3d6bcxRclYUZPe+CQdJLk61jJZ0Ja1xOV1u/2w1rfBXMC+V5zo2J?= =?us-ascii?Q?P73wK1b2grJs3ghOe67mzydgJjbrM18t1hqqrjMdKFqE/K0GVUPzmpr0lcf7?= =?us-ascii?Q?I2/vcZMRKY29HJHbTT3n9Yb3J3miOVvM7zkUCxznE+eQcH8MFnbljt0MHp7Q?= =?us-ascii?Q?zyyz5yQaj2fl//qjxSGpMJsJVtLzxHmYSN5kUZYxro+cGDka68UcK11wX0/o?= =?us-ascii?Q?EKTwxMCTJmcxZyGb7nw+zewNL8s6IEeShYymRFa4fVTMC1KrDSKTkxozfQOv?= =?us-ascii?Q?P/Rr7W1/G+EOgw35l5DNIK88+Y9SVkV5vh9LzXXxduCleyoqH31jLIcqAPzU?= =?us-ascii?Q?xBtD6JqyECLEBJ460tLhvmI0sJ+/6gK6QinpkykYFx4YSXh2pGz359vioNHx?= =?us-ascii?Q?LTYCW66WoCR55pRNRaNhobqGo+dYMonU5Df28ba8DGmAR5iFNLerJI0NKj8v?= =?us-ascii?Q?FRICFp+zFdGWa7khSEaCR3il6z7+GNqgu3SEIN6QWkgo83BwG2D6myRP+HwZ?= =?us-ascii?Q?7jCXiFuOexJg5iKGv5OU1P4/R/Gd2zYoKyaJV+K7s/e+xskssNvbV2W9Jeup?= =?us-ascii?Q?407XkX6L2EdpRLsXMeYhEy8ioKWuNZz5qsK6xf/CcOlK+9B32lG0YoJZ/Sc4?= =?us-ascii?Q?HYTgOWoQIuxP/pPl/HelP07D+9HdI5o6sB7VAc/QXdWTrC/5uvSnfRKyMTw1?= =?us-ascii?Q?84F9JfjVTPZFp1N8+AmWBKdj2cgLsNGMghhrQ0yVLAO2ORnF7UU0Zj44t9jk?= =?us-ascii?Q?O7teLd4U4daBdtQFRp6pExjhjrn5epnxwmVfLd//F/DqJtpFhJKnXH7SDd/p?= =?us-ascii?Q?hrk2MAYvA04j1JLGFFuRTPuK1v1SQpImOlEaNC5Ye4lHKqM4K2Lf95tWHOA6?= =?us-ascii?Q?LprEu0z63JTVaUDs055WSNl0?= X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-Network-Message-Id: 29c4bbc3-11b8-4fac-964b-08d8e2e2b6a2 X-MS-Exchange-CrossTenant-AuthSource: DM5PR10MB2041.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Mar 2021 10:04:22.9559 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: szIzTd+vnVAwXJbPtl4sLpXjUpGDHnk2LGVgL/YZATszwUA1X9dYDWJab9LfNLPWw5N8mCAFaWycAknQb8+2HnT49adRLknA4bZBPKs5WXk= X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR10MB1675 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9917 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 suspectscore=0 adultscore=0 phishscore=0 malwarescore=0 mlxscore=0 bulkscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2103090048 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9917 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 clxscore=1015 mlxscore=0 phishscore=0 lowpriorityscore=0 malwarescore=0 suspectscore=0 adultscore=0 mlxlogscore=999 spamscore=0 bulkscore=0 priorityscore=1501 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2103090048 X-Spam-Status: No, score=-12.0 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, MSGID_FROM_MTA_HEADER, RCVD_IN_MSPIKE_H2, SPF_HELO_PASS, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 09 Mar 2021 10:04:28 -0000 This patch changes the BPF GCC backend in order to use the DWARF debug hooks and therefore enables the user to generate BTF debugging information with -gbtf. Generating BTF is crucial when compiling BPF programs, since the CO-RE (compile-once, run-everwhere) mechanism used by the kernel BPF loader relies on it. Note that since in eBPF it is not possible to unwind frames due to the restrictive nature of the target architecture, we are disabling the generation of CFA in this target. 2021-01-22 David Faust * config/bpf/bpf.c (bpf_expand_prologue): Do not mark insns as frame related. (bpf_expand_epilogue): Likewise. * config/bpf/bpf.h (DWARF2_FRAME_INFO): Define to 0. Do not define DBX_DEBUGGING_INFO. --- gcc/config/bpf/bpf.c | 4 ---- gcc/config/bpf/bpf.h | 12 ++---------- 2 files changed, 2 insertions(+), 14 deletions(-) diff --git a/gcc/config/bpf/bpf.c b/gcc/config/bpf/bpf.c index 126d4a2798d..e635f9edb40 100644 --- a/gcc/config/bpf/bpf.c +++ b/gcc/config/bpf/bpf.c @@ -349,7 +349,6 @@ bpf_expand_prologue (void) hard_frame_pointer_rtx, fp_offset - 8)); insn = emit_move_insn (mem, gen_rtx_REG (DImode, regno)); - RTX_FRAME_RELATED_P (insn) = 1; fp_offset -= 8; } } @@ -364,7 +363,6 @@ bpf_expand_prologue (void) { insn = emit_move_insn (stack_pointer_rtx, hard_frame_pointer_rtx); - RTX_FRAME_RELATED_P (insn) = 1; if (size > 0) { @@ -372,7 +370,6 @@ bpf_expand_prologue (void) gen_rtx_PLUS (Pmode, stack_pointer_rtx, GEN_INT (-size)))); - RTX_FRAME_RELATED_P (insn) = 1; } } } @@ -412,7 +409,6 @@ bpf_expand_epilogue (void) hard_frame_pointer_rtx, fp_offset - 8)); insn = emit_move_insn (gen_rtx_REG (DImode, regno), mem); - RTX_FRAME_RELATED_P (insn) = 1; fp_offset -= 8; } } diff --git a/gcc/config/bpf/bpf.h b/gcc/config/bpf/bpf.h index 9e2f5260900..ef0123b56a6 100644 --- a/gcc/config/bpf/bpf.h +++ b/gcc/config/bpf/bpf.h @@ -235,17 +235,9 @@ enum reg_class /**** Debugging Info ****/ -/* We cannot support DWARF2 because of the limitations of eBPF. */ +/* In eBPF it is not possible to unwind frames. Disable CFA. */ -/* elfos.h insists in using DWARF. Undo that here. */ -#ifdef DWARF2_DEBUGGING_INFO -# undef DWARF2_DEBUGGING_INFO -#endif -#ifdef PREFERRED_DEBUGGING_TYPE -# undef PREFERRED_DEBUGGING_TYPE -#endif - -#define DBX_DEBUGGING_INFO +#define DWARF2_FRAME_INFO 0 /**** Stack Layout and Calling Conventions. */ -- 2.25.0.2.g232378479e