Date: Tue, 16 Mar 1999 21:28:47 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Luoqi Chen <luoqi@watermarkgroup.com> Cc: current@FreeBSD.ORG Subject: Re: VM86 assembly code problem Message-ID: <199903170528.VAA24119@apollo.backplane.com> References: <199903170413.XAA14900@lor.watermarkgroup.com>
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:There're a couple of places in swtch.s where code looks like this, : :#ifdef VM86 : btrl %esi, _private_tss : je 3f : ... :3: :#endif : :The conditional jump statement doesn't seem right, according to manual, :btrl instruction modifies CF flag but not Z, so the jump should be jae/jb :instead of je/jne. Could anyone confirm this? : :-lq btrl only effects the Carry. The VM86 code looks wrong to me, though there is an outside chance that it is doing a conditional jump based on something that occured prior to the btrl. -Matt Matthew Dillon <dillon@backplane.com> To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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