From owner-freebsd-hackers@FreeBSD.ORG Thu Jan 22 01:50:16 2015 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id BC7B9F3E for ; Thu, 22 Jan 2015 01:50:16 +0000 (UTC) Received: from na01-bn1-obe.outbound.protection.outlook.com (mail-bn1bon0099.outbound.protection.outlook.com [157.56.111.99]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (Client CN "mail.protection.outlook.com", Issuer "MSIT Machine Auth CA 2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 591CEF37 for ; Thu, 22 Jan 2015 01:50:15 +0000 (UTC) Received: from DM2PR0801MB652.namprd08.prod.outlook.com (10.242.127.155) by DM2PR0801MB652.namprd08.prod.outlook.com (10.242.127.155) with Microsoft SMTP Server (TLS) id 15.1.59.20; Thu, 22 Jan 2015 01:34:07 +0000 Received: from DM2PR0801MB652.namprd08.prod.outlook.com ([10.242.127.155]) by DM2PR0801MB652.namprd08.prod.outlook.com ([10.242.127.155]) with mapi id 15.01.0059.007; Thu, 22 Jan 2015 01:34:07 +0000 From: "Sinha, Prokash" To: "freebsd-hackers@freebsd.org" Subject: FW: elf linking problem Thread-Topic: elf linking problem Thread-Index: AQHQMTzB7oEYrYSqIUWAPLQ9gqdZQ5zCZqYAgAApdACACE5UgA== Date: Thu, 22 Jan 2015 01:34:06 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [71.92.229.68] authentication-results: spf=none (sender IP is ) smtp.mailfrom=psinha@panasas.com; x-dmarcaction-test: None x-microsoft-antispam: BCL:0;PCL:0;RULEID:(3005004);SRVR:DM2PR0801MB652; x-exchange-antispam-report-test: UriScan:; x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:;SRVR:DM2PR0801MB652; x-forefront-prvs: 0464DBBBC4 x-forefront-antispam-report: SFV:NSPM; SFS:(10009020)(6009001)(24454002)(479174004)(377454003)(199003)(164054003)(51704005)(189002)(92566002)(106356001)(50986999)(107886001)(86362001)(2351001)(106116001)(54356999)(76176999)(36756003)(77156002)(122556002)(40100003)(450100001)(15975445007)(102836002)(68736005)(77096005)(1720100001)(2950100001)(2900100001)(2656002)(110136001)(66066001)(64706001)(97736003)(46102003)(101416001)(87936001)(19580395003)(105586002)(99286002)(19580405001)(94096001); DIR:OUT; SFP:1101; SCL:1; SRVR:DM2PR0801MB652; H:DM2PR0801MB652.namprd08.prod.outlook.com; FPR:; SPF:None; MLV:sfv; PTR:InfoNoRecords; A:1; MX:1; LANG:en; received-spf: None (protection.outlook.com: panasas.com does not designate permitted sender hosts) Content-Type: text/plain; charset="us-ascii" Content-ID: <36B8C2E957750A4886127D445C00D39D@namprd08.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: panasas.com X-MS-Exchange-CrossTenant-originalarrivaltime: 22 Jan 2015 01:34:06.3849 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: acf01c9d-c699-42af-bdbb-44bf582e60b0 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM2PR0801MB652 X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Jan 2015 01:50:16 -0000 I'm forwarding to the kernel group, in case someone can point me to the root of this problem. Would appreciate any insight ! Thanks, -prokash kldload: R_X86_64_PC32 retype switch <--- This is the first failure ( from dmesg ) ink_elf_obj: symbol pan_sys_once undefinedELF_RELOC_RELA ink_elf_load_file(...) -external relocation error=3D2 linker_load_file: trying to load /boot/kernel/panfs.ko linker_load_file: error !=3D ENOENT file=3D/boot/kernel/panfs.ko linker_load_file: Unsupported file type +++++ The code section - case R_X86_64_PC32: /* S + A - P */ addr =3D lookup(lf, symidx, 1); where32 =3D (Elf32_Addr *)where; val32 =3D (Elf32_Addr)(addr + addend - (Elf_Addr)where); if (addr =3D=3D 0){ printf("kldload: R_X86_64_PC32 rtype switch\n"); <--------- Lookup failure. return -1; } if (*where32 !=3D val32) *where32 =3D val32; break; On 1/16/15 10:43 AM, "Sinha, Prokash" wrote: >So what I'm looking for is that if some sums are defined in the kernel >namespace by some kernel component, it should be visible by other kernel >module at load time fix/resolve those references, which is what the gcc on >freebsd 7.2 seem to be doing. For freebsd 10.1 using the clang front, this >could be broken. > >Can anyone point me to some document along the line of freebsd ko >linking/loading. > >I used objdump, but I'm particularly looking for some internals related >document, so that I can see the linker actually trying to pull in and >fix/resolve ref from the kernel name space. > >Thanks, >-prokash > >On 1/16/15 8:15 AM, "Sinha, Prokash" wrote: > >>Has anyone seen this , when clang is being used for 10.1 compilation ? >> >>Thanks, >>-prokash >> >> >>On 1/15/15 7:30 PM, "Sinha, Prokash" wrote: >> >>>Hello, >>> >>>I'm trying to find out what could be the cause of a kldload problem I'm >>>facing. Here is the context detail -- >>> >>> >>>1. I'm building two ko module. And it has a dependency order, so when I >>>load the first module, it loads, and a function symbol ( F ) is defined >>>into kernel variable space sysctl -b kern.function_list | tr '\0' '\n' | >>>grep symname. >>>2. Now trying to load the 2nd module, and link_elf_obj flags error and >>>symbol undefined when freebsd10.1 is being used. >>>3. If I probe using the same sysctl as in step 1, I still the symbol is >>>defined. >>> >>>/var/log/messages shows - >>>kernel: link_elf_obj: symbol pan_sys_once undefined >>>kernel: linker_load_file: Unsupported file type >>> >>>The same two modules when complied using freebsd7.2, we don't see the >>>problem. >>> >>> >>>The question is - Is there changes along the elf formats ( in both case >>>it >>>64bit), also is there any changes >>>In the API between those two OS version, that I need to aware of ( and >>>possible flags I need to set). >>> >>>Using objdump -t modone.ko >>>00000000000fb940 g F .text 0000000000000062 pan_sys_once >>> >>> >>> >>>In modtwo.ko it is undefined >>>0000000000000000 *UND* 0000000000000000 pan_sys_once >>> >>> >>>Note the objdump on freebsd 7.2, is identical. So it is defined in the >>>module1 as F(function), and undefined(UND) in module two. >>> >>>Any suggestion, please ? >>> >>>Thanks, >>>-prokash >>> >>> >>>_______________________________________________ >>>freebsd-toolchain@freebsd.org mailing list >>>http://lists.freebsd.org/mailman/listinfo/freebsd-toolchain >>>To unsubscribe, send any mail to >>>"freebsd-toolchain-unsubscribe@freebsd.org" >> >