From: dj@stealth.ctron.com (DJ Delorie)
To: hjl@nynexst.com
Cc: gas2@cygnus.com, masaki@eie.minolta.co.jp, raeburn@cygnus.com
Subject: Re: [masaki@eie.monolta.co.jp: GAS bug and etc]
Date: Fri, 11 Nov 1994 06:49:00 -0000 [thread overview]
Message-ID: <9411111450.AA12152@delorie> (raw)
In-Reply-To: <9411111444.AA05506@titanic.nynexst.com>
> I think gas will add a right address prefix automatically when it sees
> a large offset. Ken?
The problem with using the 16-bit jcxz is that, even if the offset is
small, if the target isn't in the first 64K of memory, the program is
toast. The reason is that %eip is masked to 0x0000ffff AFTER adding
the offset. The 32-bit version doesn't do this. I can't see this
behavior being of *any* use in a 32-bit program, unless you *really*
know what you're doing.
next prev parent reply other threads:[~1994-11-11 6:49 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
1994-11-11 6:11 DJ Delorie
1994-11-11 6:28 ` H.J. Lu
1994-11-11 6:37 ` DJ Delorie
1994-11-11 6:45 ` H.J. Lu
1994-11-11 6:49 ` DJ Delorie [this message]
1994-11-11 7:06 ` H.J. Lu
1994-11-11 10:31 ` Richard Stallman
1994-11-11 10:46 ` DJ Delorie
1994-11-11 14:27 ` Richard Stallman
1994-11-11 15:01 ` Arthur Kreitman
1994-11-11 13:42 mycroft
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