From patchwork Mon Sep 20 00:35:45 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yonghong Song X-Patchwork-Id: 12504481 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 30E31C433F5 for ; Mon, 20 Sep 2021 00:35:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 10FA961051 for ; Mon, 20 Sep 2021 00:35:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229529AbhITAhT (ORCPT ); Sun, 19 Sep 2021 20:37:19 -0400 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:11092 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229794AbhITAhT (ORCPT ); Sun, 19 Sep 2021 20:37:19 -0400 Received: from pps.filterd (m0109334.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 18JMkSU0005523 for ; Sun, 19 Sep 2021 17:35:53 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : content-type : content-transfer-encoding : mime-version; s=facebook; bh=KjyKc9CCDhvhh5QMDK9Sr1AbHxa7uN7/WC7WTvvbHzs=; b=DTDVlkvMV0i0bGsTe2oL/2H1QbL/ATAGVlmRYFjYb+GNb+w4sogVPmLNQnzCxXEye8AF jK1rz4ElzLEylzoga4c/30TPSUKmbpj+m0yOUvoj+EZMqz3TmOYZf2+WY6uUtWkjY4Nn HI5x5Fv1bgmnIh1tzVw9WJp3wA1fs4KuWx4= Received: from maileast.thefacebook.com ([163.114.130.16]) by mx0a-00082601.pphosted.com with ESMTP id 3b5fe8x3st-3 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Sun, 19 Sep 2021 17:35:53 -0700 Received: from intmgw001.38.frc1.facebook.com (2620:10d:c0a8:1b::d) by mail.thefacebook.com (2620:10d:c0a8:82::d) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.14; Sun, 19 Sep 2021 17:35:50 -0700 Received: by devbig003.ftw2.facebook.com (Postfix, from userid 128203) id 18AAE7713252; Sun, 19 Sep 2021 17:35:45 -0700 (PDT) From: Yonghong Song To: Arnaldo Carvalho de Melo , CC: Alexei Starovoitov , Andrii Nakryiko , , Daniel Borkmann , , Martin KaFai Lau Subject: [PATCH dwarves 0/2] generate BTF_KIND_TAG types from DW_TAG_LLVM_annotation dwarf tags Date: Sun, 19 Sep 2021 17:35:45 -0700 Message-ID: <20210920003545.3524231-1-yhs@fb.com> X-Mailer: git-send-email 2.30.2 X-FB-Internal: Safe X-FB-Source: Intern X-Proofpoint-GUID: VC3KK4DcnSK4KeD078h8SINLoaUVUmJt X-Proofpoint-ORIG-GUID: VC3KK4DcnSK4KeD078h8SINLoaUVUmJt X-Proofpoint-UnRewURL: 0 URL was un-rewritten MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.182.1,Aquarius:18.0.790,Hydra:6.0.391,FMLib:17.0.607.475 definitions=2021-09-19_07,2021-09-17_02,2020-04-07_01 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 bulkscore=0 adultscore=0 lowpriorityscore=0 suspectscore=0 priorityscore=1501 impostorscore=0 phishscore=0 mlxlogscore=598 malwarescore=0 clxscore=1015 mlxscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2109030001 definitions=main-2109200001 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org LLVM has implemented btf_tag attribute ([1]) which intended to provide a "string" tag for struct/union or its member, var, a func or its parameter. Such a "string" tag will be encoded in dwarf. For non-BPF target like x86_64, pahole needs to convert those dwarf btf_tag annotations to BTF so kernel can utilize these "string" tags for bpf program verification, etc. Patch 1 enhanced dwarf_loader to encode DW_TAG_LLVM_annotation tags into internal data structure and Patch 2 will encode such information to BTF with BTF_KIND_TAGs. [1] https://reviews.llvm.org/D106614 Yonghong Song (2): dwarf_loader: parse dwarf tag DW_TAG_LLVM_annotation btf_encoder: generate BTF_KIND_TAG from llvm annotations btf_encoder.c | 45 ++++++++++++++++++++++++++ dwarf_loader.c | 85 ++++++++++++++++++++++++++++++++++++++++++++++---- dwarves.h | 10 ++++++ pahole.c | 8 +++++ 4 files changed, 142 insertions(+), 6 deletions(-)