From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from gproxy2-pub.mail.unifiedlayer.com (gproxy2-pub.mail.unifiedlayer.com [69.89.18.3]) by sourceware.org (Postfix) with ESMTPS id 8FF7C3858C52 for ; Wed, 26 Jul 2023 16:09:19 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 8FF7C3858C52 Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=tromey.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=tromey.com Received: from cmgw11.mail.unifiedlayer.com (unknown [10.0.90.126]) by progateway4.mail.pro1.eigbox.com (Postfix) with ESMTP id A7BDA10043B29 for ; Wed, 26 Jul 2023 16:09:18 +0000 (UTC) Received: from box5379.bluehost.com ([162.241.216.53]) by cmsmtp with ESMTP id Oh4gq4ZdCy6mjOh4gqE9hu; Wed, 26 Jul 2023 16:09:18 +0000 X-Authority-Reason: nr=8 X-Authority-Analysis: v=2.4 cv=PJTKRdmC c=1 sm=1 tr=0 ts=64c1452e a=ApxJNpeYhEAb1aAlGBBbmA==:117 a=ApxJNpeYhEAb1aAlGBBbmA==:17 a=OWjo9vPv0XrRhIrVQ50Ab3nP57M=:19 a=dLZJa+xiwSxG16/P+YVxDGlgEgI=:19 a=rbmuznk9fhlwzITs:21 a=IkcTkHD0fZMA:10:nop_charset_1 a=ws7JD89P4LkA:10:nop_rcvd_month_year a=Qbun_eYptAEA:10:endurance_base64_authed_username_1 a=5KLPUuaC_9wA:10:nop_rfc2047_subject_charset a=lv0vYI88AAAA:8 a=ewS-VHL0ia4mHHuUbpYA:9 a=QEXdDO2ut3YA:10:nop_charset_2 a=9qqun4PRrEabIEPCFt1_:22 a=gculh8dCHkmVPOC7cHxs:22 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=tromey.com; s=default; h=Content-Transfer-Encoding:Content-Type:MIME-Version:Message-ID: In-Reply-To:Date:References:Subject:Cc:To:From:Sender:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=ulswvJdZZvZRsKtiDCKBvklyuLDci8DNElXEKmcHT7g=; b=YjUR56aC1q9fdjTjSJcTqo18wC J6ZfTqaiP6L/vBikl5oxni4pQfBJyWxBpzJGJmkLP6XZIRNVjQW/Vo31IoE19rg8PhdpJd1k9MjGy /VS2QjpCKt4F7zeyNgiclKLDG; Received: from 75-166-135-140.hlrn.qwest.net ([75.166.135.140]:43084 helo=murgatroyd) by box5379.bluehost.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1qOh4g-001h6i-0g; Wed, 26 Jul 2023 10:09:18 -0600 From: Tom Tromey To: =?utf-8?B?5bqE56eL5b2s?= Cc: "gdb@sourceware.org" Subject: Re: why gdb try to read address 0x0 when I set =?utf-8?Q?$pc?= =?utf-8?Q?=EF=BC=8Chow?= to suppress this behavior? References: <16c8bb4f69de36253945d0fb7891fb770dd49697.5b4244aa.a4ef.425c.9c3b.f2b37af9ec63@feishu.cn> X-Attribution: Tom Date: Wed, 26 Jul 2023 10:09:17 -0600 In-Reply-To: <16c8bb4f69de36253945d0fb7891fb770dd49697.5b4244aa.a4ef.425c.9c3b.f2b37af9ec63@feishu.cn> (=?utf-8?B?IuW6hOeni+W9rCIncw==?= message of "Wed, 19 Jul 2023 15:59:24 +0800") Message-ID: <87bkfyk636.fsf@tromey.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - box5379.bluehost.com X-AntiAbuse: Original Domain - sourceware.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - tromey.com X-BWhitelist: no X-Source-IP: 75.166.135.140 X-Source-L: No X-Exim-ID: 1qOh4g-001h6i-0g X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: 75-166-135-140.hlrn.qwest.net (murgatroyd) [75.166.135.140]:43084 X-Source-Auth: tom+tromey.com X-Email-Count: 2 X-Source-Cap: ZWx5bnJvYmk7ZWx5bnJvYmk7Ym94NTM3OS5ibHVlaG9zdC5jb20= X-Local-Domain: yes X-Spam-Status: No, score=-3017.8 required=5.0 tests=BAYES_00,BODY_8BITS,DKIM_SIGNED,DKIM_VALID,JMQ_SPF_NEUTRAL,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_PASS,TXREP,T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: >>>>> =E5=BA=84=E7=A7=8B=E5=BD=AC writes: Sorry about the delay on this. > I use gdb with openocd to debug a riscv board, and found that when set > $pc=3Dxxx(a non-zero value) in gdb, gdb would first read the address > 0x0, which caused an error on this riscv device. Is there any > documentation or suggestions for reading the source code to solve this > problem?=C2=A0 I don't think so. Reading 0x0 when trying to set $pc is unexpected to me at least. I'd normally approach this by debugging gdb to try to understand why it is happening. Tom