From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Thu, 30 Aug 2007 21:06:41 +0100 (BST) Received: from mail.lysator.liu.se ([130.236.254.3]:32202 "EHLO mail.lysator.liu.se") by ftp.linux-mips.org with ESMTP id S20022893AbXH3UGc (ORCPT ); Thu, 30 Aug 2007 21:06:32 +0100 Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.lysator.liu.se (Postfix) with ESMTP id 002DA200A21C; Thu, 30 Aug 2007 22:06:00 +0200 (CEST) Received: from mail.lysator.liu.se ([127.0.0.1]) by localhost (lenin.lysator.liu.se [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 01149-01; Thu, 30 Aug 2007 22:05:59 +0200 (CEST) Received: from [192.168.27.65] (6.240.216.81.static.lk.siwnet.net [81.216.240.6]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.lysator.liu.se (Postfix) with ESMTP id 12AE1200A213; Thu, 30 Aug 2007 22:05:57 +0200 (CEST) Message-ID: <46D722E1.3080205@27m.se> Date: Thu, 30 Aug 2007 22:04:49 +0200 From: Markus Gothe User-Agent: Icedove 1.5.0.12 (X11/20070730) MIME-Version: 1.0 To: Giuseppe Sacco Cc: linux-mips@linux-mips.org Subject: Re: Exception while loading kernel References: <1188030215.13999.14.camel@scarafaggio> <1188196563.2177.13.camel@scarafaggio> <46D2CB0F.7020505@27m.se> <1188321514.6882.3.camel@scarafaggio> <1188478342.6770.14.camel@scarafaggio> In-Reply-To: <1188478342.6770.14.camel@scarafaggio> X-Enigmail-Version: 0.94.2.0 Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 8bit X-Virus-Scanned: by amavisd-new-20030616-p10 (Debian) at lysator.liu.se Return-Path: X-Envelope-To: <"|/home/ecartis/ecartis -s linux-mips"> (uid 0) X-Orcpt: rfc822;linux-mips@linux-mips.org Original-Recipient: rfc822;linux-mips@linux-mips.org X-archive-position: 16330 X-ecartis-version: Ecartis v1.0.0 Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org X-original-sender: markus.gothe@27m.se Precedence: bulk X-list: linux-mips -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Yes, this is usually the way (I use) to debug the kernel without using kdbg / adding hooks for kdbg. Seems to me like a memory-addressing issue. //Markus Giuseppe Sacco wrote: > Hi Markus, > > Il giorno mer, 29/08/2007 alle 04.25 +0200, Markus Gothe ha > scritto: >> Use gdb and list the read address. > > I think I understood what you mean. I recompiled the kernel adding > the debug symbols, stripped it and booted with it. There I got > those numbers (using the 32bit version): > > Exception PC: 0x8021c9fc, Exception RA: 0x804ddc6c gpda 0x81060e08, > _regs 0x81061008 arg: 81070000 0 80503518 1 tmp: 81070000 1000 > 8051a868 fff8054f ffffffff 81412ef4 a13fab68 7 sve: 81070000 > 4083ae51 0 4608a976 0 4085cc91 0 3ed97758 > > then run gdb and issue those commands: > > (gdb) info symbol 0x8021c9fc __bzero + 56 in section .text (gdb) > info symbol 0x804ddc6c init_bootmem_core + 196 in section > .init.text (gdb) list *0x804ddc6c 0x804ddc6c is in > init_bootmem_core (mm/bootmem.c:107). 102 */ 103 > mapsize = get_mapsize(bdata); 104 > memset(bdata->node_bootmem_map, 0xff, mapsize); 105 106 > return mapsize; 107 } 108 109 /* 110 * Marks a > particular physical memory range as unallocatable. Usable RAM 111 > * might be used for boot-time allocations - or it might get added > (gdb) list *0x8021c9fc No source file for address 0x8021c9fc. (gdb) > disassemble 0x804ddc6c Dump of assembler code for function > init_bootmem_core: 0xffffffff804ddba8 : > daddiu sp,sp,-32 0xffffffff804ddbac : > sd ra,16(sp) 0xffffffff804ddbb0 : > sd s1,8(sp) 0xffffffff804ddbb4 : sd > s0,0(sp) 0xffffffff804ddbb8 : li > v0,-13 0xffffffff804ddbbc : ld > s1,648(a0) 0xffffffff804ddbc0 : dsll > a1,a1,0xc 0xffffffff804ddbc4 : dsll32 > v0,v0,0x1b 0xffffffff804ddbc8 : daddu > a1,a1,v0 0xffffffff804ddbcc : dsll > a2,a2,0xc 0xffffffff804ddbd0 : sd > a1,16(s1) 0xffffffff804ddbd4 : sd > a3,8(s1) 0xffffffff804ddbd8 : sd > a2,0(s1) 0xffffffff804ddbdc : lui > v1,0x0 0xffffffff804ddbe0 : lui > at,0x8049 0xffffffff804ddbe4 : daddiu > v1,v1,0 0xffffffff804ddbe8 : dsll32 > v1,v1,0x0 0xffffffff804ddbec : daddu > v1,v1,at 0xffffffff804ddbf0 : ld > v1,2112(v1) 0xffffffff804ddbf4 : lui > a1,0x0 0xffffffff804ddbf8 : lui > at,0x8049 0xffffffff804ddbfc : daddiu > a1,a1,0 0xffffffff804ddc00 : daddiu > at,at,2112 0xffffffff804ddc04 : dsll32 > a1,a1,0x0 0xffffffff804ddc08 : daddu > a1,a1,at 0xffffffff804ddc0c : bnel > v1,a1,0x804ddc88 0xffffffff804ddc10 > : ld v0,-48(v1) 0xffffffff804ddc14 > : daddiu v0,s1,48 0xffffffff804ddc18 > : sd a1,48(s1) 0xffffffff804ddc1c > : move a0,s1 0xffffffff804ddc20 > : lui at,0x0 0xffffffff804ddc24 > : daddiu at,at,0 0xffffffff804ddc28 > : dsll at,at,0x10 0xffffffff804ddc2c > : daddiu at,at,-32695 > 0xffffffff804ddc30 : dsll at,at,0x10 > 0xffffffff804ddc34 : sd v0,2120(at) > 0xffffffff804ddc38 : lui at,0x0 > 0xffffffff804ddc3c : daddiu at,at,0 > 0xffffffff804ddc40 : dsll at,at,0x10 > 0xffffffff804ddc44 : daddiu > at,at,-32695 0xffffffff804ddc48 : dsll > at,at,0x10 0xffffffff804ddc4c : sd > v0,2112(at) 0xffffffff804ddc50 : jal > 0x804dd5c8 0xffffffff804ddc54 > : sd a1,8(v0) 0xffffffff804ddc58 > : ld a0,16(s1) 0xffffffff804ddc5c > : move s0,v0 0xffffffff804ddc60 > : li a1,255 0xffffffff804ddc64 > : jal 0x8021c9a0 > 0xffffffff804ddc68 : move a2,v0 > 0xffffffff804ddc6c : move v0,s0 > 0xffffffff804ddc70 : ld ra,16(sp) > 0xffffffff804ddc74 : ld s1,8(sp) > 0xffffffff804ddc78 : ld s0,0(sp) > 0xffffffff804ddc7c : jr ra [...] > (gdb) info line *0x804ddc6c Line 107 of "mm/bootmem.c" starts at > address 0x804ddc6c and ends at 0x804ddc88 > . (gdb) info line *0x804ddc6b Line 104 of > "mm/bootmem.c" starts at address 0x804ddc60 > and ends at 0x804ddc6c . > > > So, it this what you requested? > >> From what I understand the problem may be that >> bdata->node_bootmem_map > maybe incorrectly initialised for this machine. > > Bye, Giuseppe > > - -- _______________________________________ Mr Markus Gothe Software Engineer Phone: +46 (0)13 21 81 20 (ext. 1046) Fax: +46 (0)13 21 21 15 Mobile: +46 (0)73 718 72 80 Diskettgatan 11, SE-583 35 Linköping, Sweden www.27m.com -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFG1xR56I0XmJx2NrwRCCIIAJ9qqcFcMJK7izUn/yJUiUQwufHnYACeIiqt tNI/Ew/0EFKp7Qzxi3issJU= =NbCf -----END PGP SIGNATURE-----