Date: Tue, 29 Dec 1998 14:04:17 +1030 From: Greg Lehey <grog@lemis.com> To: Doug Rabson <dfr@nlsystems.com>, 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: <19981229140417.A32838@freebie.lemis.com> In-Reply-To: <Pine.BSF.4.01.9812231028570.25052-100000@herring.nlsystems.com>; from Doug Rabson on Wed, Dec 23, 1998 at 10:30:24AM %2B0000 References: <199812230532.NAA39231@spinner.netplex.com.au> <Pine.BSF.4.01.9812231028570.25052-100000@herring.nlsystems.com>
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On Wednesday, 23 December 1998 at 10:30:24 +0000, Doug Rabson wrote: > On Wed, 23 Dec 1998, 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.. :-/ > > Perhaps an #ifdef DDB extra field in struct linker_file which the ELF > backend could fill in with the correct offset? After struggling through the structures, I now understand this statement. Yes, I think this would be an *excellent* idea. Peter? 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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