Date: Wed, 23 Dec 1998 16:06:21 +1030 From: Greg Lehey <grog@lemis.com> To: Peter Wemm <peter@netplex.com.au> Cc: Bruce Evans <bde@zeta.org.au>, jonny@jonny.eng.br, cvs-all@FreeBSD.ORG, cvs-committers@FreeBSD.ORG Subject: Re: Use of LKMs (was: cvs commit: src/share/mk bsd.kern.mk src/sys/alpha/conf Makefile.alpha) Message-ID: <19981223160621.D12346@freebie.lemis.com> In-Reply-To: <199812230532.NAA39231@spinner.netplex.com.au>; from Peter Wemm on Wed, Dec 23, 1998 at 01:32:50PM %2B0800 References: <19981220101713.O24125@freebie.lemis.com> <199812230532.NAA39231@spinner.netplex.com.au>
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On Wednesday, 23 December 1998 at 13:32:50 +0800, Peter Wemm wrote: > Greg Lehey wrote: >> On Saturday, 19 December 1998 at 23:27:39 +1100, Bruce Evans wrote: >>>> #define quoting(Bruce Evans) >>>> // src/lkm -> src/sys/lkm (like src/sys/modules) >>>> >>>> Is there a reason to keep the lkm's, now that kld's are working ? >>>> (Aren't they ?) >>> >>> They might still be being used. >> >> [Somehow I missed the original of this] >> >> What's the current situation for kld debugging? I'm using Vinum as an >> lkm because I can debug it that way. > > It works just fine, with one exception.. With LKM's you use a fixed > offset to skip the header - 0x20 from memory. With KLD's you have to get > that from the header: > # objdump --headers /modules/vinum.ko | more > Idx Name Size VMA LMA File off Algn > [..] > 6 .text 0000915c 000051e4 000051e4 000051e4 2**2 > CONTENTS, ALLOC, LOAD, READONLY, CODE > In this case, it would be 0x51e4 as the symbol offset rather than 0x20. > > Scriptifying that could be fun though.. :-/ Remember that the value must be stored in kernel memory somewhere, and gdb has access to it. All I need to know is the location. What concerns me more is that when testing an LKM, I simplify things by having only one LKM loaded, so it's always in lkmods[0]. It looks like it would be difficult to achieve this with klds. Greg -- See complete headers for address, home page and phone numbers finger grog@lemis.com for PGP public key To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
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