From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F00D4EE021D for ; Fri, 15 Sep 2023 05:40:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229527AbjIOFlD (ORCPT ); Fri, 15 Sep 2023 01:41:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33132 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229754AbjIOFlC (ORCPT ); Fri, 15 Sep 2023 01:41:02 -0400 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9653D2719 for ; Thu, 14 Sep 2023 22:40:55 -0700 (PDT) Received: from pps.filterd (m0356517.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 38F5bQPC030888; Fri, 15 Sep 2023 05:40:40 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : mime-version : content-transfer-encoding; s=pp1; bh=yKkPkczmfk6TPO3HMRoDZ9TYl/iopdRW/KjWTdm4GB4=; b=DFATb6YENz/EQlEF4c92Olo656WL7wOfmY+5JyazSpKLxLGwCe8eRb6P2hwpu0z9QJXo vPZnMgr4ezXsLi3eZzhfOMGLYYiXrSBD8c9UETXFdiKG59Clcw8VRTftWYe/ud1pIu+9 yZ6uHEcx+o3Y3iw6WjiZdDKQLXIjjZXPWKZqOZopu8Ahd8K19EfAMKOnAD+XaEARAFYb 8TYsvVuxsa+92xUPTwFSV9ysfUKXl3EVfMf7yW24iXhLtc+9TDV5tA3+4ONx0fpQhoL2 jGex2O1yCoeikX+9vAqhwxkDkOQIvk21YgKv+wF4GL1zXaQL2Hn2oFB82iJ6+AnMWOgl nw== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3t4gwngrtc-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 15 Sep 2023 05:40:38 +0000 Received: from m0356517.ppops.net (m0356517.ppops.net [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 38F5bNUp030462; Fri, 15 Sep 2023 05:38:43 GMT Received: from ppma12.dal12v.mail.ibm.com (dc.9e.1632.ip4.static.sl-reverse.com [50.22.158.220]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3t4gwngmek-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 15 Sep 2023 05:38:43 +0000 Received: from pps.filterd (ppma12.dal12v.mail.ibm.com [127.0.0.1]) by ppma12.dal12v.mail.ibm.com (8.17.1.19/8.17.1.19) with ESMTP id 38F3lOt7024103; Fri, 15 Sep 2023 05:38:00 GMT Received: from smtprelay06.fra02v.mail.ibm.com ([9.218.2.230]) by ppma12.dal12v.mail.ibm.com (PPS) with ESMTPS id 3t131try49-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 15 Sep 2023 05:38:00 +0000 Received: from smtpav06.fra02v.mail.ibm.com (smtpav06.fra02v.mail.ibm.com [10.20.54.105]) by smtprelay06.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 38F5bvcS44040804 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 15 Sep 2023 05:37:57 GMT Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7862B20040; Fri, 15 Sep 2023 05:37:57 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1281720049; Fri, 15 Sep 2023 05:37:55 +0000 (GMT) Received: from localhost.localdomain (unknown [9.43.67.213]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 15 Sep 2023 05:37:54 +0000 (GMT) From: Athira Rajeev To: acme@kernel.org, jolsa@kernel.org, adrian.hunter@intel.com, irogers@google.com, namhyung@kernel.org Cc: linux-perf-users@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, maddy@linux.ibm.com, atrajeev@linux.vnet.ibm.com, kjain@linux.ibm.com, disgoel@linux.vnet.ibm.com, Disha Goel Subject: [PATCH V4 1/2] tools/perf: Add text_end to "struct dso" to save .text section size Date: Fri, 15 Sep 2023 11:07:51 +0530 Message-Id: <20230915053752.3012-1-atrajeev@linux.vnet.ibm.com> X-Mailer: git-send-email 2.35.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: dg9q9LYwMIht-d3HiwoMX_Tn2bL9mJtW X-Proofpoint-ORIG-GUID: 2KRfb7eletvl_OszdlIm_JWglzj42HFd X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.980,Hydra:6.0.601,FMLib:17.11.176.26 definitions=2023-09-15_05,2023-09-14_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 impostorscore=0 spamscore=0 bulkscore=0 lowpriorityscore=0 malwarescore=0 mlxscore=0 priorityscore=1501 phishscore=0 adultscore=0 clxscore=1015 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2308100000 definitions=main-2309150049 Precedence: bulk List-ID: X-Mailing-List: linux-perf-users@vger.kernel.org Update "struct dso" to include new member "text_end". This new field will represent the offset for end of text section for a dso. For elf, this value is derived as: sh_size (Size of section in byes) + sh_offset (Section file offst) of the elf header for text. For bfd, this value is derived as: 1. For PE file, section->size + ( section->vma - dso->text_offset) 2. Other cases: section->filepos (file position) + section->size (size of section) To resolve the address from a sample, perf looks at the DSO maps. In case of address from a kernel module, there were some address found to be not resolved. This was observed while running perf test for "Object code reading". Though the ip falls beteen the start address of the loaded module (perf map->start ) and end address ( perf map->end), it was unresolved. Example: Reading object code for memory address: 0xc008000007f0142c File is: /lib/modules/6.5.0-rc3+/kernel/fs/xfs/xfs.ko On file address is: 0x1114cc Objdump command is: objdump -z -d --start-address=0x11142c --stop-address=0x1114ac /lib/modules/6.5.0-rc3+/kernel/fs/xfs/xfs.ko objdump read too few bytes: 128 test child finished with -1 Here, module is loaded at: # cat /proc/modules | grep xfs xfs 2228224 3 - Live 0xc008000007d00000 >From objdump for xfs module, text section is: text 0010f7bc 0000000000000000 0000000000000000 000000a0 2**4 Here the offset for 0xc008000007f0142c ie 0x112074 falls out .text section which is up to 0x10f7bc. In this case for module, the address 0xc008000007e11fd4 is pointing to stub instructions. This address range represents the module stubs which is allocated on module load and hence is not part of DSO offset. To identify such address, which falls out of text section and within module end, added the new field "text_end" to "struct dso". Reported-by: Disha Goel Signed-off-by: Athira Rajeev Reviewed-by: Adrian Hunter --- Changelog: v2 -> v3: Added Reviewed-by from Adrian v1 -> v2: Added text_end for bfd also by updating dso__load_bfd_symbols as suggested by Adrian. tools/perf/util/dso.h | 1 + tools/perf/util/symbol-elf.c | 4 +++- tools/perf/util/symbol.c | 2 ++ 3 files changed, 6 insertions(+), 1 deletion(-) diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h index b41c9782c754..70fe0fe69bef 100644 --- a/tools/perf/util/dso.h +++ b/tools/perf/util/dso.h @@ -181,6 +181,7 @@ struct dso { u8 rel; struct build_id bid; u64 text_offset; + u64 text_end; const char *short_name; const char *long_name; u16 long_name_len; diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c index 95e99c332d7e..9e7eeaf616b8 100644 --- a/tools/perf/util/symbol-elf.c +++ b/tools/perf/util/symbol-elf.c @@ -1514,8 +1514,10 @@ dso__load_sym_internal(struct dso *dso, struct map *map, struct symsrc *syms_ss, } if (elf_section_by_name(runtime_ss->elf, &runtime_ss->ehdr, &tshdr, - ".text", NULL)) + ".text", NULL)) { dso->text_offset = tshdr.sh_addr - tshdr.sh_offset; + dso->text_end = tshdr.sh_offset + tshdr.sh_size; + } if (runtime_ss->opdsec) opddata = elf_rawdata(runtime_ss->opdsec, NULL); diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c index 3f36675b7c8f..f25e4e62cf25 100644 --- a/tools/perf/util/symbol.c +++ b/tools/perf/util/symbol.c @@ -1733,8 +1733,10 @@ int dso__load_bfd_symbols(struct dso *dso, const char *debugfile) /* PE symbols can only have 4 bytes, so use .text high bits */ dso->text_offset = section->vma - (u32)section->vma; dso->text_offset += (u32)bfd_asymbol_value(symbols[i]); + dso->text_end = (section->vma - dso->text_offset) + section->size; } else { dso->text_offset = section->vma - section->filepos; + dso->text_end = section->filepos + section->size; } } -- 2.31.1