From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 21090 invoked by alias); 31 May 2010 09:22:12 -0000 Received: (qmail 21077 invoked by uid 22791); 31 May 2010 09:22:11 -0000 X-SWARE-Spam-Status: No, hits=0.8 required=5.0 tests=AWL,BAYES_40,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,FREEMAIL_ENVFROM_END_DIGIT,FREEMAIL_FROM,RCVD_IN_DNSWL_NONE,T_RP_MATCHES_RCVD X-Spam-Check-By: sourceware.org Received: from n5-vm0.bullet.mail.gq1.yahoo.com (HELO n5-vm0.bullet.mail.gq1.yahoo.com) (67.195.8.62) by sourceware.org (qpsmtpd/0.43rc1) with SMTP; Mon, 31 May 2010 09:22:06 +0000 Received: from [67.195.9.83] by n5.bullet.mail.gq1.yahoo.com with NNFMP; 31 May 2010 09:22:05 -0000 Received: from [98.137.27.223] by t3.bullet.mail.gq1.yahoo.com with NNFMP; 31 May 2010 09:22:05 -0000 Received: from [127.0.0.1] by omp201.mail.gq1.yahoo.com with NNFMP; 31 May 2010 09:22:05 -0000 Received: (qmail 53141 invoked by uid 60001); 31 May 2010 09:22:05 -0000 Message-ID: <88426.50861.qm@web112506.mail.gq1.yahoo.com> Received: from [72.163.183.42] by web112506.mail.gq1.yahoo.com via HTTP; Mon, 31 May 2010 02:22:05 PDT References: Date: Mon, 31 May 2010 09:22:00 -0000 From: paawan oza Subject: Re: [GDB help] Regarding breakpoint support in ARM To: Suraj Sivan , gdb@sourceware.org In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-IsSubscribed: yes 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 X-SW-Source: 2010-05/txt/msg00108.txt.bz2 Hi, The moment you give continue, gdb keeps on trying to insert the extra hw breakpoint all the time. I think, gdb expects you to remove manually and then continue (if you rove previously set hw breakpoint, then it should work also) I wonder, even after knowing that it can not set extra hw watch-point, due to lack of debug registers, still it goes ahead and set it in its private list, which could be avoided. (this is the case with x86 also, If I am correct) Regards, Oza. ----- Original Message ---- From: Suraj Sivan To: gdb@sourceware.org Sent: Mon, May 31, 2010 12:30:05 PM Subject: [GDB help] Regarding breakpoint support in ARM Hi, I'm working with GDB and custom GDB Server for debugging ARM. The core is ARM7TDMI-S which has 2 hardware resources for setting breakpoints. I am using the option "set breakpoint always-inserted on" so that whenever I set a breakpoint or watcpoint, GDB will put it immediately rather than waiting for continue command. After setting three breakpoints(2 software and 1 hardware), if I try to put a 4th hardware breakpoint GDB will give a warning as below: Warning: Cannot insert hardware breakpoint 4. Could not insert hardware breakpoints: You may have requested too many hardware breakpoints/watchpoints. Now if I list the breakpoints using "info b" command, GDB displays as below: Num Type Disp Enb Address What 1 breakpoint keep y 0x40000010 ../source/armloop.s:8 2 breakpoint keep y 0x40000020 ../source/armloop.s:12 3 hw breakpoint keep y 0x40000030 ../source/armloop.s:16 4 hw breakpoint keep y 0x40000040 ../source/armloop.s:20 Here it is seen that GDB keeps the 4th hardware breakpoint information in its table. If I give a continue command, GDB will try to put the 4th breakpoint again and gives the same warning as above and gets into a situation where I have to manually delete the 4th breakpoint to further continue. Is there an option for GDB to not keep the information of the particular breakpoint which it gives a warning like above? regards Suraj S