From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 122958 invoked by alias); 3 Mar 2015 12:08:37 -0000 Mailing-List: contact gdb-testers-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-testers-owner@sourceware.org Received: (qmail 122947 invoked by uid 89); 3 Mar 2015 12:08:37 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-1.1 required=5.0 tests=AWL,BAYES_00 autolearn=ham version=3.3.2 X-HELO: kwanyin.sergiodj.net Received: from kwanyin.sergiodj.net (HELO kwanyin.sergiodj.net) (176.31.208.32) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with (AES128-SHA encrypted) ESMTPS; Tue, 03 Mar 2015 12:08:36 +0000 Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [binutils-gdb] btrace: support 32-bit inferior on 64-bit host From: sergiodj+buildbot@redhat.com To: gdb-testers@sourceware.org Message-Id: Date: Tue, 03 Mar 2015 13:24:00 -0000 X-SW-Source: 2015-q1/txt/msg04359.txt.bz2 *** TEST RESULTS FOR COMMIT d68e53f47932eb7c374df9b90faed7aca2eed9d7 *** Author: Markus Metzger Branch: master Commit: d68e53f47932eb7c374df9b90faed7aca2eed9d7 btrace: support 32-bit inferior on 64-bit host The heuristic for filtering out kernel addressess in BTS trace checks the most significant bit in each address. This works fine for 32-bit and 64-bit mode. For 32-bit compatibility mode, i.e. a 32-bit inferior running on 64-bit host, we need to check bit 63 (or any bit bigger than 31), not bit 31. Use the machine field in struct utsname provided by a uname call to determine whether we are running on a 64-bit host. Thanks to Jan Kratochvil for reporting the issue. gdb/ * nat/linux-btrace.c: Include sys/utsname.h. (linux_determine_kernel_ptr_bits): New. (linux_enable_bts): Call linux_determine_kernel_ptr_bits. * x86-linux-nat.c (x86_linux_enable_btrace): Do not overwrite non-zero ptr_bits. gdbserver/ * linux-low.c (linux_low_enable_btrace): Do not overwrite non-zero ptr_bits.