From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 91522 invoked by alias); 7 Jul 2017 20:30:44 -0000 Mailing-List: contact gdb-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-owner@sourceware.org Received: (qmail 91471 invoked by uid 89); 7 Jul 2017 20:30:38 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-2.4 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_NONE,SPF_HELO_PASS autolearn=ham version=3.3.2 spammy=out, are X-HELO: NAM01-BY2-obe.outbound.protection.outlook.com Received: from mail-by2nam01on0078.outbound.protection.outlook.com (HELO NAM01-BY2-obe.outbound.protection.outlook.com) (104.47.34.78) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Fri, 07 Jul 2017 20:30:37 +0000 Authentication-Results: redhat.com; dkim=none (message not signed) header.d=none;redhat.com; dmarc=none action=none header.from=cavium.com; 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X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR07MB3464 X-SW-Source: 2017-07/txt/msg00007.txt.bz2 On Fri, 2017-07-07 at 19:36 +0100, Pedro Alves wrote: > > Though I have no idea whether an Aarch64 build of libthread_db is > capable of biarch debugging.  It may be that GDB is already trying to > the load the 64-bit libthread_db, but then libthread_db rejects > the inferior for some reason.  The "set debug libthread-db" option > should > help you figure that out.  See below. OK, setting libthread-db-search-path and debug libthread-db got me a bit further.  I don't get any errors or warnings about not being able to find or load libthread_db.  It's still not reading everything correctly though: (gdb) info threads Found 0 new threads in iteration 0.   Id   Target Id         Frame  * 3    Thread 0xf739ef70 (LWP 8660) 0x00400680 in doSomeThing ()   4    Thread 0xf69bf490 (LWP 8662) warning: Couldn't find general-purpose registers in core file. PC register is not available I don't see any code in gdb/linux-thread-db.c that seems to be conditional on the word size (ILP32 vs LP64).  I also don't see anything in glibc nptl-db directory that appears to be conditional on word size.  Things like pthread_t and __SIZEOF_PTHREAD_ATTR_T are  different for the two different ABIs though.  But that is true for x86 too and things seem to be working there.  I am not sure what (if anything) would need to be done to libthread_db to support biarch debugging. Steve Ellcey sellcey@cavium.com