Date: Mon, 27 Nov 2000 12:27:36 +1030 From: Greg Lehey <grog@lemis.com> To: Jake Burkholder <jburkhol@home.com> Cc: smp@FreeBSD.ORG Subject: Re: BSD/OS interrupt code Message-ID: <20001127122736.G27697@echunga.lemis.com> In-Reply-To: <20001127015006.5B7BDBA7A@io.yi.org>; from jburkhol@home.com on Sun, Nov 26, 2000 at 05:50:06PM -0800 References: <grog@lemis.com> <20001127015006.5B7BDBA7A@io.yi.org>
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On Sunday, 26 November 2000 at 17:50:06 -0800, Jake Burkholder wrote: >> On Sunday, 26 November 2000 at 14:07:49 -0800, Jake Burkholder wrote: >>> Hi, >>> >>> If anyone with access to the BSD/OS code is interested, I've written >>> a little program that runs their interrupt stub code generator in >>> userland. You can then abort(); and disassemble the stub from >>> the core dump to look at the code all in one piece. Makes it much >>> easier to follow. >>> >>> In case you haven't looked, their interrupt handlers are generated >>> by bcopy-ing various blocks of assembler code into an array at >>> runtime, and then poking in arguments and relocating branches. >> >> Interesting. I was wondering whether something similar would be a >> good idea. On the other hand, We don't waste much space by having >> multiple alternate stubs. What's your feeling? > > I suspect that it would be hard to do this for architectures > other than x86, which has a relatively simple instruction format. > > I also think that BSD/OS went a little too far with this, and > have produced code that is very difficult to understand, let > alone maintain. I think its cool what they did, I'm humbled > and amazed that they made it work, but I don't know that its > right for FreeBSD. That's a reasonable objection. Where's your program? Greg -- Finger grog@lemis.com for PGP public key See complete headers for address and phone numbers To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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